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-rw-r--r--lib/sqfs/comp/lz4/README12
-rw-r--r--lib/sqfs/comp/lz4/lz4.c1708
-rw-r--r--lib/sqfs/comp/lz4/lz4.h341
-rw-r--r--lib/sqfs/comp/lz4/lz4hc.c1343
-rw-r--r--lib/sqfs/comp/lz4/lz4hc.h307
-rw-r--r--lib/sqfs/comp/zlib/README195
-rw-r--r--lib/sqfs/comp/zlib/adler32.c186
-rw-r--r--lib/sqfs/comp/zlib/deflate.c2168
-rw-r--r--lib/sqfs/comp/zlib/deflate.h349
-rw-r--r--lib/sqfs/comp/zlib/inffast.c323
-rw-r--r--lib/sqfs/comp/zlib/inffast.h11
-rw-r--r--lib/sqfs/comp/zlib/inffixed.h94
-rw-r--r--lib/sqfs/comp/zlib/inflate.c1582
-rw-r--r--lib/sqfs/comp/zlib/inflate.h125
-rw-r--r--lib/sqfs/comp/zlib/inftrees.c309
-rw-r--r--lib/sqfs/comp/zlib/inftrees.h62
-rw-r--r--lib/sqfs/comp/zlib/trees.c1203
-rw-r--r--lib/sqfs/comp/zlib/trees.h128
-rw-r--r--lib/sqfs/comp/zlib/zconf.h471
-rw-r--r--lib/sqfs/comp/zlib/zlib.h1912
-rw-r--r--lib/sqfs/comp/zlib/zutil.c331
-rw-r--r--lib/sqfs/comp/zlib/zutil.h279
22 files changed, 0 insertions, 13439 deletions
diff --git a/lib/sqfs/comp/lz4/README b/lib/sqfs/comp/lz4/README
deleted file mode 100644
index 4c15347..0000000
--- a/lib/sqfs/comp/lz4/README
+++ /dev/null
@@ -1,12 +0,0 @@
-This source has been extracted from the lz4 release tarball, version 1.9.2
-released on August 20th, 2019.
-
-The source code originates from the "lib" subdirectory. The license is included
-in the subdirectory licenses/LZ4.txt in the tools-ng subdirectory of the
-squashfs-tools-ng source package.
-
-The following modifications have been made:
- - Always define LZ4LIB_API and LZ4LIB_STATIC_API to set default visibility to
- hidden, so the LZ4 functions aren't exported from libsquashfs.
- - Remove the streaming functions and most of the functions that aren't used
- by libsquashfs.
diff --git a/lib/sqfs/comp/lz4/lz4.c b/lib/sqfs/comp/lz4/lz4.c
deleted file mode 100644
index 853d228..0000000
--- a/lib/sqfs/comp/lz4/lz4.c
+++ /dev/null
@@ -1,1708 +0,0 @@
-/*
- LZ4 - Fast LZ compression algorithm
- Copyright (C) 2011-present, Yann Collet.
-
- BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions are
- met:
-
- * Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above
- copyright notice, this list of conditions and the following disclaimer
- in the documentation and/or other materials provided with the
- distribution.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- You can contact the author at :
- - LZ4 homepage : http://www.lz4.org
- - LZ4 source repository : https://github.com/lz4/lz4
-*/
-
-/*-************************************
-* Tuning parameters
-**************************************/
-/*
- * LZ4_HEAPMODE :
- * Select how default compression functions will allocate memory for their hash table,
- * in memory stack (0:default, fastest), or in memory heap (1:requires malloc()).
- */
-#ifndef LZ4_HEAPMODE
-# define LZ4_HEAPMODE 0
-#endif
-
-/*
- * ACCELERATION_DEFAULT :
- * Select "acceleration" for LZ4_compress_fast() when parameter value <= 0
- */
-#define ACCELERATION_DEFAULT 1
-
-
-/*-************************************
-* CPU Feature Detection
-**************************************/
-/* LZ4_FORCE_MEMORY_ACCESS
- * By default, access to unaligned memory is controlled by `memcpy()`, which is safe and portable.
- * Unfortunately, on some target/compiler combinations, the generated assembly is sub-optimal.
- * The below switch allow to select different access method for improved performance.
- * Method 0 (default) : use `memcpy()`. Safe and portable.
- * Method 1 : `__packed` statement. It depends on compiler extension (ie, not portable).
- * This method is safe if your compiler supports it, and *generally* as fast or faster than `memcpy`.
- * Method 2 : direct access. This method is portable but violate C standard.
- * It can generate buggy code on targets which assembly generation depends on alignment.
- * But in some circumstances, it's the only known way to get the most performance (ie GCC + ARMv6)
- * See https://fastcompression.blogspot.fr/2015/08/accessing-unaligned-memory.html for details.
- * Prefer these methods in priority order (0 > 1 > 2)
- */
-#ifndef LZ4_FORCE_MEMORY_ACCESS /* can be defined externally */
-# if defined(__GNUC__) && \
- ( defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || defined(__ARM_ARCH_6K__) \
- || defined(__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) )
-# define LZ4_FORCE_MEMORY_ACCESS 2
-# elif (defined(__INTEL_COMPILER) && !defined(_WIN32)) || defined(__GNUC__)
-# define LZ4_FORCE_MEMORY_ACCESS 1
-# endif
-#endif
-
-/*
- * LZ4_FORCE_SW_BITCOUNT
- * Define this parameter if your target system or compiler does not support hardware bit count
- */
-#if defined(_MSC_VER) && defined(_WIN32_WCE) /* Visual Studio for WinCE doesn't support Hardware bit count */
-# define LZ4_FORCE_SW_BITCOUNT
-#endif
-
-
-
-/*-************************************
-* Dependency
-**************************************/
-/*
- * LZ4_SRC_INCLUDED:
- * Amalgamation flag, whether lz4.c is included
- */
-#ifndef LZ4_SRC_INCLUDED
-# define LZ4_SRC_INCLUDED 1
-#endif
-
-#ifndef LZ4_STATIC_LINKING_ONLY
-#define LZ4_STATIC_LINKING_ONLY
-#endif
-
-#ifndef LZ4_DISABLE_DEPRECATE_WARNINGS
-#define LZ4_DISABLE_DEPRECATE_WARNINGS /* due to LZ4_decompress_safe_withPrefix64k */
-#endif
-
-#define LZ4_STATIC_LINKING_ONLY /* LZ4_DISTANCE_MAX */
-#include "lz4.h"
-/* see also "memory routines" below */
-
-
-/*-************************************
-* Compiler Options
-**************************************/
-#ifdef _MSC_VER /* Visual Studio */
-# include <intrin.h>
-# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */
-# pragma warning(disable : 4293) /* disable: C4293: too large shift (32-bits) */
-#endif /* _MSC_VER */
-
-#ifndef LZ4_FORCE_INLINE
-# ifdef _MSC_VER /* Visual Studio */
-# define LZ4_FORCE_INLINE static __forceinline
-# else
-# if defined (__cplusplus) || defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L /* C99 */
-# ifdef __GNUC__
-# define LZ4_FORCE_INLINE static inline __attribute__((always_inline))
-# else
-# define LZ4_FORCE_INLINE static inline
-# endif
-# else
-# define LZ4_FORCE_INLINE static
-# endif /* __STDC_VERSION__ */
-# endif /* _MSC_VER */
-#endif /* LZ4_FORCE_INLINE */
-
-/* LZ4_FORCE_O2_GCC_PPC64LE and LZ4_FORCE_O2_INLINE_GCC_PPC64LE
- * gcc on ppc64le generates an unrolled SIMDized loop for LZ4_wildCopy8,
- * together with a simple 8-byte copy loop as a fall-back path.
- * However, this optimization hurts the decompression speed by >30%,
- * because the execution does not go to the optimized loop
- * for typical compressible data, and all of the preamble checks
- * before going to the fall-back path become useless overhead.
- * This optimization happens only with the -O3 flag, and -O2 generates
- * a simple 8-byte copy loop.
- * With gcc on ppc64le, all of the LZ4_decompress_* and LZ4_wildCopy8
- * functions are annotated with __attribute__((optimize("O2"))),
- * and also LZ4_wildCopy8 is forcibly inlined, so that the O2 attribute
- * of LZ4_wildCopy8 does not affect the compression speed.
- */
-#if defined(__PPC64__) && defined(__LITTLE_ENDIAN__) && defined(__GNUC__) && !defined(__clang__)
-# define LZ4_FORCE_O2_GCC_PPC64LE __attribute__((optimize("O2")))
-# define LZ4_FORCE_O2_INLINE_GCC_PPC64LE __attribute__((optimize("O2"))) LZ4_FORCE_INLINE
-#else
-# define LZ4_FORCE_O2_GCC_PPC64LE
-# define LZ4_FORCE_O2_INLINE_GCC_PPC64LE static
-#endif
-
-#if (defined(__GNUC__) && (__GNUC__ >= 3)) || (defined(__INTEL_COMPILER) && (__INTEL_COMPILER >= 800)) || defined(__clang__)
-# define expect(expr,value) (__builtin_expect ((expr),(value)) )
-#else
-# define expect(expr,value) (expr)
-#endif
-
-#ifndef likely
-#define likely(expr) expect((expr) != 0, 1)
-#endif
-#ifndef unlikely
-#define unlikely(expr) expect((expr) != 0, 0)
-#endif
-
-
-/*-************************************
-* Memory routines
-**************************************/
-#include <stdlib.h> /* malloc, calloc, free */
-#define ALLOC(s) malloc(s)
-#define ALLOC_AND_ZERO(s) calloc(1,s)
-#define FREEMEM(p) free(p)
-#include <string.h> /* memset, memcpy */
-#define MEM_INIT(p,v,s) memset((p),(v),(s))
-
-
-/*-************************************
-* Common Constants
-**************************************/
-#define MINMATCH 4
-
-#define WILDCOPYLENGTH 8
-#define LASTLITERALS 5 /* see ../doc/lz4_Block_format.md#parsing-restrictions */
-#define MFLIMIT 12 /* see ../doc/lz4_Block_format.md#parsing-restrictions */
-#define MATCH_SAFEGUARD_DISTANCE ((2*WILDCOPYLENGTH) - MINMATCH) /* ensure it's possible to write 2 x wildcopyLength without overflowing output buffer */
-#define FASTLOOP_SAFE_DISTANCE 64
-static const int LZ4_minLength = (MFLIMIT+1);
-
-#define KB *(1 <<10)
-#define MB *(1 <<20)
-#define GB *(1U<<30)
-
-#define LZ4_DISTANCE_ABSOLUTE_MAX 65535
-#if (LZ4_DISTANCE_MAX > LZ4_DISTANCE_ABSOLUTE_MAX) /* max supported by LZ4 format */
-# error "LZ4_DISTANCE_MAX is too big : must be <= 65535"
-#endif
-
-#define ML_BITS 4
-#define ML_MASK ((1U<<ML_BITS)-1)
-#define RUN_BITS (8-ML_BITS)
-#define RUN_MASK ((1U<<RUN_BITS)-1)
-
-
-/*-************************************
-* Error detection
-**************************************/
-#if defined(LZ4_DEBUG) && (LZ4_DEBUG>=1)
-# include <assert.h>
-#else
-# ifndef assert
-# define assert(condition) ((void)0)
-# endif
-#endif
-
-#define LZ4_STATIC_ASSERT(c) { enum { LZ4_static_assert = 1/(int)(!!(c)) }; } /* use after variable declarations */
-
-#if defined(LZ4_DEBUG) && (LZ4_DEBUG>=2)
-# include <stdio.h>
-static int g_debuglog_enable = 1;
-# define DEBUGLOG(l, ...) { \
- if ((g_debuglog_enable) && (l<=LZ4_DEBUG)) { \
- fprintf(stderr, __FILE__ ": "); \
- fprintf(stderr, __VA_ARGS__); \
- fprintf(stderr, " \n"); \
- } }
-#else
-# define DEBUGLOG(l, ...) {} /* disabled */
-#endif
-
-
-/*-************************************
-* Types
-**************************************/
-#if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
-# include <stdint.h>
- typedef uint8_t BYTE;
- typedef uint16_t U16;
- typedef uint32_t U32;
- typedef int32_t S32;
- typedef uint64_t U64;
- typedef uintptr_t uptrval;
-#else
- typedef unsigned char BYTE;
- typedef unsigned short U16;
- typedef unsigned int U32;
- typedef signed int S32;
- typedef unsigned long long U64;
- typedef size_t uptrval; /* generally true, except OpenVMS-64 */
-#endif
-
-#if defined(__x86_64__)
- typedef U64 reg_t; /* 64-bits in x32 mode */
-#else
- typedef size_t reg_t; /* 32-bits in x32 mode */
-#endif
-
-typedef enum {
- notLimited = 0,
- limitedOutput = 1,
- fillOutput = 2
-} limitedOutput_directive;
-
-
-/*-************************************
-* Reading and writing into memory
-**************************************/
-static unsigned LZ4_isLittleEndian(void)
-{
- const union { U32 u; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */
- return one.c[0];
-}
-
-
-#if defined(LZ4_FORCE_MEMORY_ACCESS) && (LZ4_FORCE_MEMORY_ACCESS==2)
-/* lie to the compiler about data alignment; use with caution */
-
-static U16 LZ4_read16(const void* memPtr) { return *(const U16*) memPtr; }
-static U32 LZ4_read32(const void* memPtr) { return *(const U32*) memPtr; }
-static reg_t LZ4_read_ARCH(const void* memPtr) { return *(const reg_t*) memPtr; }
-
-static void LZ4_write16(void* memPtr, U16 value) { *(U16*)memPtr = value; }
-static void LZ4_write32(void* memPtr, U32 value) { *(U32*)memPtr = value; }
-
-#elif defined(LZ4_FORCE_MEMORY_ACCESS) && (LZ4_FORCE_MEMORY_ACCESS==1)
-
-/* __pack instructions are safer, but compiler specific, hence potentially problematic for some compilers */
-/* currently only defined for gcc and icc */
-typedef union { U16 u16; U32 u32; reg_t uArch; } __attribute__((packed)) unalign;
-
-static U16 LZ4_read16(const void* ptr) { return ((const unalign*)ptr)->u16; }
-static U32 LZ4_read32(const void* ptr) { return ((const unalign*)ptr)->u32; }
-static reg_t LZ4_read_ARCH(const void* ptr) { return ((const unalign*)ptr)->uArch; }
-
-static void LZ4_write16(void* memPtr, U16 value) { ((unalign*)memPtr)->u16 = value; }
-static void LZ4_write32(void* memPtr, U32 value) { ((unalign*)memPtr)->u32 = value; }
-
-#else /* safe and portable access using memcpy() */
-
-static U16 LZ4_read16(const void* memPtr)
-{
- U16 val; memcpy(&val, memPtr, sizeof(val)); return val;
-}
-
-static U32 LZ4_read32(const void* memPtr)
-{
- U32 val; memcpy(&val, memPtr, sizeof(val)); return val;
-}
-
-static reg_t LZ4_read_ARCH(const void* memPtr)
-{
- reg_t val; memcpy(&val, memPtr, sizeof(val)); return val;
-}
-
-static void LZ4_write16(void* memPtr, U16 value)
-{
- memcpy(memPtr, &value, sizeof(value));
-}
-
-static void LZ4_write32(void* memPtr, U32 value)
-{
- memcpy(memPtr, &value, sizeof(value));
-}
-
-#endif /* LZ4_FORCE_MEMORY_ACCESS */
-
-
-static U16 LZ4_readLE16(const void* memPtr)
-{
- if (LZ4_isLittleEndian()) {
- return LZ4_read16(memPtr);
- } else {
- const BYTE* p = (const BYTE*)memPtr;
- return (U16)((U16)p[0] + (p[1]<<8));
- }
-}
-
-static void LZ4_writeLE16(void* memPtr, U16 value)
-{
- if (LZ4_isLittleEndian()) {
- LZ4_write16(memPtr, value);
- } else {
- BYTE* p = (BYTE*)memPtr;
- p[0] = (BYTE) value;
- p[1] = (BYTE)(value>>8);
- }
-}
-
-/* customized variant of memcpy, which can overwrite up to 8 bytes beyond dstEnd */
-LZ4_FORCE_O2_INLINE_GCC_PPC64LE
-void LZ4_wildCopy8(void* dstPtr, const void* srcPtr, void* dstEnd)
-{
- BYTE* d = (BYTE*)dstPtr;
- const BYTE* s = (const BYTE*)srcPtr;
- BYTE* const e = (BYTE*)dstEnd;
-
- do { memcpy(d,s,8); d+=8; s+=8; } while (d<e);
-}
-
-static const unsigned inc32table[8] = {0, 1, 2, 1, 0, 4, 4, 4};
-static const int dec64table[8] = {0, 0, 0, -1, -4, 1, 2, 3};
-
-
-#ifndef LZ4_FAST_DEC_LOOP
-# if defined(__i386__) || defined(__x86_64__)
-# define LZ4_FAST_DEC_LOOP 1
-# elif defined(__aarch64__) && !defined(__clang__)
- /* On aarch64, we disable this optimization for clang because on certain
- * mobile chipsets and clang, it reduces performance. For more information
- * refer to https://github.com/lz4/lz4/pull/707. */
-# define LZ4_FAST_DEC_LOOP 1
-# else
-# define LZ4_FAST_DEC_LOOP 0
-# endif
-#endif
-
-#if LZ4_FAST_DEC_LOOP
-
-LZ4_FORCE_O2_INLINE_GCC_PPC64LE void
-LZ4_memcpy_using_offset_base(BYTE* dstPtr, const BYTE* srcPtr, BYTE* dstEnd, const size_t offset)
-{
- if (offset < 8) {
- dstPtr[0] = srcPtr[0];
- dstPtr[1] = srcPtr[1];
- dstPtr[2] = srcPtr[2];
- dstPtr[3] = srcPtr[3];
- srcPtr += inc32table[offset];
- memcpy(dstPtr+4, srcPtr, 4);
- srcPtr -= dec64table[offset];
- dstPtr += 8;
- } else {
- memcpy(dstPtr, srcPtr, 8);
- dstPtr += 8;
- srcPtr += 8;
- }
-
- LZ4_wildCopy8(dstPtr, srcPtr, dstEnd);
-}
-
-/* customized variant of memcpy, which can overwrite up to 32 bytes beyond dstEnd
- * this version copies two times 16 bytes (instead of one time 32 bytes)
- * because it must be compatible with offsets >= 16. */
-LZ4_FORCE_O2_INLINE_GCC_PPC64LE void
-LZ4_wildCopy32(void* dstPtr, const void* srcPtr, void* dstEnd)
-{
- BYTE* d = (BYTE*)dstPtr;
- const BYTE* s = (const BYTE*)srcPtr;
- BYTE* const e = (BYTE*)dstEnd;
-
- do { memcpy(d,s,16); memcpy(d+16,s+16,16); d+=32; s+=32; } while (d<e);
-}
-
-/* LZ4_memcpy_using_offset() presumes :
- * - dstEnd >= dstPtr + MINMATCH
- * - there is at least 8 bytes available to write after dstEnd */
-LZ4_FORCE_O2_INLINE_GCC_PPC64LE void
-LZ4_memcpy_using_offset(BYTE* dstPtr, const BYTE* srcPtr, BYTE* dstEnd, const size_t offset)
-{
- BYTE v[8];
-
- assert(dstEnd >= dstPtr + MINMATCH);
- LZ4_write32(dstPtr, 0); /* silence an msan warning when offset==0 */
-
- switch(offset) {
- case 1:
- memset(v, *srcPtr, 8);
- break;
- case 2:
- memcpy(v, srcPtr, 2);
- memcpy(&v[2], srcPtr, 2);
- memcpy(&v[4], &v[0], 4);
- break;
- case 4:
- memcpy(v, srcPtr, 4);
- memcpy(&v[4], srcPtr, 4);
- break;
- default:
- LZ4_memcpy_using_offset_base(dstPtr, srcPtr, dstEnd, offset);
- return;
- }
-
- memcpy(dstPtr, v, 8);
- dstPtr += 8;
- while (dstPtr < dstEnd) {
- memcpy(dstPtr, v, 8);
- dstPtr += 8;
- }
-}
-#endif
-
-
-/*-************************************
-* Common functions
-**************************************/
-static unsigned LZ4_NbCommonBytes (reg_t val)
-{
- if (LZ4_isLittleEndian()) {
- if (sizeof(val)==8) {
-# if defined(_MSC_VER) && defined(_WIN64) && !defined(LZ4_FORCE_SW_BITCOUNT)
- unsigned long r = 0;
- _BitScanForward64( &r, (U64)val );
- return (int)(r>>3);
-# elif (defined(__clang__) || (defined(__GNUC__) && (__GNUC__>=3))) && !defined(LZ4_FORCE_SW_BITCOUNT)
- return (unsigned)__builtin_ctzll((U64)val) >> 3;
-# else
- static const int DeBruijnBytePos[64] = { 0, 0, 0, 0, 0, 1, 1, 2,
- 0, 3, 1, 3, 1, 4, 2, 7,
- 0, 2, 3, 6, 1, 5, 3, 5,
- 1, 3, 4, 4, 2, 5, 6, 7,
- 7, 0, 1, 2, 3, 3, 4, 6,
- 2, 6, 5, 5, 3, 4, 5, 6,
- 7, 1, 2, 4, 6, 4, 4, 5,
- 7, 2, 6, 5, 7, 6, 7, 7 };
- return DeBruijnBytePos[((U64)((val & -(long long)val) * 0x0218A392CDABBD3FULL)) >> 58];
-# endif
- } else /* 32 bits */ {
-# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
- unsigned long r;
- _BitScanForward( &r, (U32)val );
- return (int)(r>>3);
-# elif (defined(__clang__) || (defined(__GNUC__) && (__GNUC__>=3))) && !defined(LZ4_FORCE_SW_BITCOUNT)
- return (unsigned)__builtin_ctz((U32)val) >> 3;
-# else
- static const int DeBruijnBytePos[32] = { 0, 0, 3, 0, 3, 1, 3, 0,
- 3, 2, 2, 1, 3, 2, 0, 1,
- 3, 3, 1, 2, 2, 2, 2, 0,
- 3, 1, 2, 0, 1, 0, 1, 1 };
- return DeBruijnBytePos[((U32)((val & -(S32)val) * 0x077CB531U)) >> 27];
-# endif
- }
- } else /* Big Endian CPU */ {
- if (sizeof(val)==8) { /* 64-bits */
-# if defined(_MSC_VER) && defined(_WIN64) && !defined(LZ4_FORCE_SW_BITCOUNT)
- unsigned long r = 0;
- _BitScanReverse64( &r, val );
- return (unsigned)(r>>3);
-# elif (defined(__clang__) || (defined(__GNUC__) && (__GNUC__>=3))) && !defined(LZ4_FORCE_SW_BITCOUNT)
- return (unsigned)__builtin_clzll((U64)val) >> 3;
-# else
- static const U32 by32 = sizeof(val)*4; /* 32 on 64 bits (goal), 16 on 32 bits.
- Just to avoid some static analyzer complaining about shift by 32 on 32-bits target.
- Note that this code path is never triggered in 32-bits mode. */
- unsigned r;
- if (!(val>>by32)) { r=4; } else { r=0; val>>=by32; }
- if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; }
- r += (!val);
- return r;
-# endif
- } else /* 32 bits */ {
-# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
- unsigned long r = 0;
- _BitScanReverse( &r, (unsigned long)val );
- return (unsigned)(r>>3);
-# elif (defined(__clang__) || (defined(__GNUC__) && (__GNUC__>=3))) && !defined(LZ4_FORCE_SW_BITCOUNT)
- return (unsigned)__builtin_clz((U32)val) >> 3;
-# else
- unsigned r;
- if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; }
- r += (!val);
- return r;
-# endif
- }
- }
-}
-
-#define STEPSIZE sizeof(reg_t)
-LZ4_FORCE_INLINE
-unsigned LZ4_count(const BYTE* pIn, const BYTE* pMatch, const BYTE* pInLimit)
-{
- const BYTE* const pStart = pIn;
-
- if (likely(pIn < pInLimit-(STEPSIZE-1))) {
- reg_t const diff = LZ4_read_ARCH(pMatch) ^ LZ4_read_ARCH(pIn);
- if (!diff) {
- pIn+=STEPSIZE; pMatch+=STEPSIZE;
- } else {
- return LZ4_NbCommonBytes(diff);
- } }
-
- while (likely(pIn < pInLimit-(STEPSIZE-1))) {
- reg_t const diff = LZ4_read_ARCH(pMatch) ^ LZ4_read_ARCH(pIn);
- if (!diff) { pIn+=STEPSIZE; pMatch+=STEPSIZE; continue; }
- pIn += LZ4_NbCommonBytes(diff);
- return (unsigned)(pIn - pStart);
- }
-
- if ((STEPSIZE==8) && (pIn<(pInLimit-3)) && (LZ4_read32(pMatch) == LZ4_read32(pIn))) { pIn+=4; pMatch+=4; }
- if ((pIn<(pInLimit-1)) && (LZ4_read16(pMatch) == LZ4_read16(pIn))) { pIn+=2; pMatch+=2; }
- if ((pIn<pInLimit) && (*pMatch == *pIn)) pIn++;
- return (unsigned)(pIn - pStart);
-}
-
-
-#ifndef LZ4_COMMONDEFS_ONLY
-/*-************************************
-* Local Constants
-**************************************/
-static const int LZ4_64Klimit = ((64 KB) + (MFLIMIT-1));
-static const U32 LZ4_skipTrigger = 6; /* Increase this value ==> compression run slower on incompressible data */
-
-
-/*-************************************
-* Local Structures and types
-**************************************/
-typedef enum { clearedTable = 0, byPtr, byU32, byU16 } tableType_t;
-
-/**
- * This enum distinguishes several different modes of accessing previous
- * content in the stream.
- *
- * - noDict : There is no preceding content.
- * - withPrefix64k : Table entries up to ctx->dictSize before the current blob
- * blob being compressed are valid and refer to the preceding
- * content (of length ctx->dictSize), which is available
- * contiguously preceding in memory the content currently
- * being compressed.
- * - usingExtDict : Like withPrefix64k, but the preceding content is somewhere
- * else in memory, starting at ctx->dictionary with length
- * ctx->dictSize.
- * - usingDictCtx : Like usingExtDict, but everything concerning the preceding
- * content is in a separate context, pointed to by
- * ctx->dictCtx. ctx->dictionary, ctx->dictSize, and table
- * entries in the current context that refer to positions
- * preceding the beginning of the current compression are
- * ignored. Instead, ctx->dictCtx->dictionary and ctx->dictCtx
- * ->dictSize describe the location and size of the preceding
- * content, and matches are found by looking in the ctx
- * ->dictCtx->hashTable.
- */
-typedef enum { noDict = 0, withPrefix64k, usingExtDict, usingDictCtx } dict_directive;
-typedef enum { noDictIssue = 0, dictSmall } dictIssue_directive;
-
-
-/*-************************************
-* Local Utils
-**************************************/
-int LZ4_compressBound(int isize) { return LZ4_COMPRESSBOUND(isize); }
-
-/*-******************************
-* Compression functions
-********************************/
-static U32 LZ4_hash4(U32 sequence, tableType_t const tableType)
-{
- if (tableType == byU16)
- return ((sequence * 2654435761U) >> ((MINMATCH*8)-(LZ4_HASHLOG+1)));
- else
- return ((sequence * 2654435761U) >> ((MINMATCH*8)-LZ4_HASHLOG));
-}
-
-static U32 LZ4_hash5(U64 sequence, tableType_t const tableType)
-{
- const U32 hashLog = (tableType == byU16) ? LZ4_HASHLOG+1 : LZ4_HASHLOG;
- if (LZ4_isLittleEndian()) {
- const U64 prime5bytes = 889523592379ULL;
- return (U32)(((sequence << 24) * prime5bytes) >> (64 - hashLog));
- } else {
- const U64 prime8bytes = 11400714785074694791ULL;
- return (U32)(((sequence >> 24) * prime8bytes) >> (64 - hashLog));
- }
-}
-
-LZ4_FORCE_INLINE U32 LZ4_hashPosition(const void* const p, tableType_t const tableType)
-{
- if ((sizeof(reg_t)==8) && (tableType != byU16)) return LZ4_hash5(LZ4_read_ARCH(p), tableType);
- return LZ4_hash4(LZ4_read32(p), tableType);
-}
-
-static void LZ4_clearHash(U32 h, void* tableBase, tableType_t const tableType)
-{
- switch (tableType)
- {
- default: /* fallthrough */
- case clearedTable: { /* illegal! */ assert(0); return; }
- case byPtr: { const BYTE** hashTable = (const BYTE**)tableBase; hashTable[h] = NULL; return; }
- case byU32: { U32* hashTable = (U32*) tableBase; hashTable[h] = 0; return; }
- case byU16: { U16* hashTable = (U16*) tableBase; hashTable[h] = 0; return; }
- }
-}
-
-static void LZ4_putIndexOnHash(U32 idx, U32 h, void* tableBase, tableType_t const tableType)
-{
- switch (tableType)
- {
- default: /* fallthrough */
- case clearedTable: /* fallthrough */
- case byPtr: { /* illegal! */ assert(0); return; }
- case byU32: { U32* hashTable = (U32*) tableBase; hashTable[h] = idx; return; }
- case byU16: { U16* hashTable = (U16*) tableBase; assert(idx < 65536); hashTable[h] = (U16)idx; return; }
- }
-}
-
-static void LZ4_putPositionOnHash(const BYTE* p, U32 h,
- void* tableBase, tableType_t const tableType,
- const BYTE* srcBase)
-{
- switch (tableType)
- {
- case clearedTable: { /* illegal! */ assert(0); return; }
- case byPtr: { const BYTE** hashTable = (const BYTE**)tableBase; hashTable[h] = p; return; }
- case byU32: { U32* hashTable = (U32*) tableBase; hashTable[h] = (U32)(p-srcBase); return; }
- case byU16: { U16* hashTable = (U16*) tableBase; hashTable[h] = (U16)(p-srcBase); return; }
- }
-}
-
-LZ4_FORCE_INLINE void LZ4_putPosition(const BYTE* p, void* tableBase, tableType_t tableType, const BYTE* srcBase)
-{
- U32 const h = LZ4_hashPosition(p, tableType);
- LZ4_putPositionOnHash(p, h, tableBase, tableType, srcBase);
-}
-
-/* LZ4_getIndexOnHash() :
- * Index of match position registered in hash table.
- * hash position must be calculated by using base+index, or dictBase+index.
- * Assumption 1 : only valid if tableType == byU32 or byU16.
- * Assumption 2 : h is presumed valid (within limits of hash table)
- */
-static U32 LZ4_getIndexOnHash(U32 h, const void* tableBase, tableType_t tableType)
-{
- LZ4_STATIC_ASSERT(LZ4_MEMORY_USAGE > 2);
- if (tableType == byU32) {
- const U32* const hashTable = (const U32*) tableBase;
- assert(h < (1U << (LZ4_MEMORY_USAGE-2)));
- return hashTable[h];
- }
- if (tableType == byU16) {
- const U16* const hashTable = (const U16*) tableBase;
- assert(h < (1U << (LZ4_MEMORY_USAGE-1)));
- return hashTable[h];
- }
- assert(0); return 0; /* forbidden case */
-}
-
-static const BYTE* LZ4_getPositionOnHash(U32 h, const void* tableBase, tableType_t tableType, const BYTE* srcBase)
-{
- if (tableType == byPtr) { const BYTE* const* hashTable = (const BYTE* const*) tableBase; return hashTable[h]; }
- if (tableType == byU32) { const U32* const hashTable = (const U32*) tableBase; return hashTable[h] + srcBase; }
- { const U16* const hashTable = (const U16*) tableBase; return hashTable[h] + srcBase; } /* default, to ensure a return */
-}
-
-LZ4_FORCE_INLINE const BYTE*
-LZ4_getPosition(const BYTE* p,
- const void* tableBase, tableType_t tableType,
- const BYTE* srcBase)
-{
- U32 const h = LZ4_hashPosition(p, tableType);
- return LZ4_getPositionOnHash(h, tableBase, tableType, srcBase);
-}
-
-LZ4_FORCE_INLINE void
-LZ4_prepareTable(LZ4_stream_t_internal* const cctx,
- const int inputSize,
- const tableType_t tableType) {
- /* If compression failed during the previous step, then the context
- * is marked as dirty, therefore, it has to be fully reset.
- */
- if (cctx->dirty) {
- DEBUGLOG(5, "LZ4_prepareTable: Full reset for %p", cctx);
- MEM_INIT(cctx, 0, sizeof(LZ4_stream_t_internal));
- return;
- }
-
- /* If the table hasn't been used, it's guaranteed to be zeroed out, and is
- * therefore safe to use no matter what mode we're in. Otherwise, we figure
- * out if it's safe to leave as is or whether it needs to be reset.
- */
- if (cctx->tableType != clearedTable) {
- assert(inputSize >= 0);
- if (cctx->tableType != tableType
- || ((tableType == byU16) && cctx->currentOffset + (unsigned)inputSize >= 0xFFFFU)
- || ((tableType == byU32) && cctx->currentOffset > 1 GB)
- || tableType == byPtr
- || inputSize >= 4 KB)
- {
- DEBUGLOG(4, "LZ4_prepareTable: Resetting table in %p", cctx);
- MEM_INIT(cctx->hashTable, 0, LZ4_HASHTABLESIZE);
- cctx->currentOffset = 0;
- cctx->tableType = clearedTable;
- } else {
- DEBUGLOG(4, "LZ4_prepareTable: Re-use hash table (no reset)");
- }
- }
-
- /* Adding a gap, so all previous entries are > LZ4_DISTANCE_MAX back, is faster
- * than compressing without a gap. However, compressing with
- * currentOffset == 0 is faster still, so we preserve that case.
- */
- if (cctx->currentOffset != 0 && tableType == byU32) {
- DEBUGLOG(5, "LZ4_prepareTable: adding 64KB to currentOffset");
- cctx->currentOffset += 64 KB;
- }
-
- /* Finally, clear history */
- cctx->dictCtx = NULL;
- cctx->dictionary = NULL;
- cctx->dictSize = 0;
-}
-
-/** LZ4_compress_generic() :
- inlined, to ensure branches are decided at compilation time */
-LZ4_FORCE_INLINE int LZ4_compress_generic(
- LZ4_stream_t_internal* const cctx,
- const char* const source,
- char* const dest,
- const int inputSize,
- int *inputConsumed, /* only written when outputDirective == fillOutput */
- const int maxOutputSize,
- const limitedOutput_directive outputDirective,
- const tableType_t tableType,
- const dict_directive dictDirective,
- const dictIssue_directive dictIssue,
- const int acceleration)
-{
- int result;
- const BYTE* ip = (const BYTE*) source;
-
- U32 const startIndex = cctx->currentOffset;
- const BYTE* base = (const BYTE*) source - startIndex;
- const BYTE* lowLimit;
-
- const LZ4_stream_t_internal* dictCtx = (const LZ4_stream_t_internal*) cctx->dictCtx;
- const BYTE* const dictionary =
- dictDirective == usingDictCtx ? dictCtx->dictionary : cctx->dictionary;
- const U32 dictSize =
- dictDirective == usingDictCtx ? dictCtx->dictSize : cctx->dictSize;
- const U32 dictDelta = (dictDirective == usingDictCtx) ? startIndex - dictCtx->currentOffset : 0; /* make indexes in dictCtx comparable with index in current context */
-
- int const maybe_extMem = (dictDirective == usingExtDict) || (dictDirective == usingDictCtx);
- U32 const prefixIdxLimit = startIndex - dictSize; /* used when dictDirective == dictSmall */
- const BYTE* const dictEnd = dictionary + dictSize;
- const BYTE* anchor = (const BYTE*) source;
- const BYTE* const iend = ip + inputSize;
- const BYTE* const mflimitPlusOne = iend - MFLIMIT + 1;
- const BYTE* const matchlimit = iend - LASTLITERALS;
-
- /* the dictCtx currentOffset is indexed on the start of the dictionary,
- * while a dictionary in the current context precedes the currentOffset */
- const BYTE* dictBase = (dictDirective == usingDictCtx) ?
- dictionary + dictSize - dictCtx->currentOffset :
- dictionary + dictSize - startIndex;
-
- BYTE* op = (BYTE*) dest;
- BYTE* const olimit = op + maxOutputSize;
-
- U32 offset = 0;
- U32 forwardH;
-
- DEBUGLOG(5, "LZ4_compress_generic: srcSize=%i, tableType=%u", inputSize, tableType);
- /* If init conditions are not met, we don't have to mark stream
- * as having dirty context, since no action was taken yet */
- if (outputDirective == fillOutput && maxOutputSize < 1) { return 0; } /* Impossible to store anything */
- if ((U32)inputSize > (U32)LZ4_MAX_INPUT_SIZE) { return 0; } /* Unsupported inputSize, too large (or negative) */
- if ((tableType == byU16) && (inputSize>=LZ4_64Klimit)) { return 0; } /* Size too large (not within 64K limit) */
- if (tableType==byPtr) assert(dictDirective==noDict); /* only supported use case with byPtr */
- assert(acceleration >= 1);
-
- lowLimit = (const BYTE*)source - (dictDirective == withPrefix64k ? dictSize : 0);
-
- /* Update context state */
- if (dictDirective == usingDictCtx) {
- /* Subsequent linked blocks can't use the dictionary. */
- /* Instead, they use the block we just compressed. */
- cctx->dictCtx = NULL;
- cctx->dictSize = (U32)inputSize;
- } else {
- cctx->dictSize += (U32)inputSize;
- }
- cctx->currentOffset += (U32)inputSize;
- cctx->tableType = (U16)tableType;
-
- if (inputSize<LZ4_minLength) goto _last_literals; /* Input too small, no compression (all literals) */
-
- /* First Byte */
- LZ4_putPosition(ip, cctx->hashTable, tableType, base);
- ip++; forwardH = LZ4_hashPosition(ip, tableType);
-
- /* Main Loop */
- for ( ; ; ) {
- const BYTE* match;
- BYTE* token;
- const BYTE* filledIp;
-
- /* Find a match */
- if (tableType == byPtr) {
- const BYTE* forwardIp = ip;
- int step = 1;
- int searchMatchNb = acceleration << LZ4_skipTrigger;
- do {
- U32 const h = forwardH;
- ip = forwardIp;
- forwardIp += step;
- step = (searchMatchNb++ >> LZ4_skipTrigger);
-
- if (unlikely(forwardIp > mflimitPlusOne)) goto _last_literals;
- assert(ip < mflimitPlusOne);
-
- match = LZ4_getPositionOnHash(h, cctx->hashTable, tableType, base);
- forwardH = LZ4_hashPosition(forwardIp, tableType);
- LZ4_putPositionOnHash(ip, h, cctx->hashTable, tableType, base);
-
- } while ( (match+LZ4_DISTANCE_MAX < ip)
- || (LZ4_read32(match) != LZ4_read32(ip)) );
-
- } else { /* byU32, byU16 */
-
- const BYTE* forwardIp = ip;
- int step = 1;
- int searchMatchNb = acceleration << LZ4_skipTrigger;
- do {
- U32 const h = forwardH;
- U32 const current = (U32)(forwardIp - base);
- U32 matchIndex = LZ4_getIndexOnHash(h, cctx->hashTable, tableType);
- assert(matchIndex <= current);
- assert(forwardIp - base < (ptrdiff_t)(2 GB - 1));
- ip = forwardIp;
- forwardIp += step;
- step = (searchMatchNb++ >> LZ4_skipTrigger);
-
- if (unlikely(forwardIp > mflimitPlusOne)) goto _last_literals;
- assert(ip < mflimitPlusOne);
-
- if (dictDirective == usingDictCtx) {
- if (matchIndex < startIndex) {
- /* there was no match, try the dictionary */
- assert(tableType == byU32);
- matchIndex = LZ4_getIndexOnHash(h, dictCtx->hashTable, byU32);
- match = dictBase + matchIndex;
- matchIndex += dictDelta; /* make dictCtx index comparable with current context */
- lowLimit = dictionary;
- } else {
- match = base + matchIndex;
- lowLimit = (const BYTE*)source;
- }
- } else if (dictDirective==usingExtDict) {
- if (matchIndex < startIndex) {
- DEBUGLOG(7, "extDict candidate: matchIndex=%5u < startIndex=%5u", matchIndex, startIndex);
- assert(startIndex - matchIndex >= MINMATCH);
- match = dictBase + matchIndex;
- lowLimit = dictionary;
- } else {
- match = base + matchIndex;
- lowLimit = (const BYTE*)source;
- }
- } else { /* single continuous memory segment */
- match = base + matchIndex;
- }
- forwardH = LZ4_hashPosition(forwardIp, tableType);
- LZ4_putIndexOnHash(current, h, cctx->hashTable, tableType);
-
- DEBUGLOG(7, "candidate at pos=%u (offset=%u \n", matchIndex, current - matchIndex);
- if ((dictIssue == dictSmall) && (matchIndex < prefixIdxLimit)) { continue; } /* match outside of valid area */
- assert(matchIndex < current);
- if ( ((tableType != byU16) || (LZ4_DISTANCE_MAX < LZ4_DISTANCE_ABSOLUTE_MAX))
- && (matchIndex+LZ4_DISTANCE_MAX < current)) {
- continue;
- } /* too far */
- assert((current - matchIndex) <= LZ4_DISTANCE_MAX); /* match now expected within distance */
-
- if (LZ4_read32(match) == LZ4_read32(ip)) {
- if (maybe_extMem) offset = current - matchIndex;
- break; /* match found */
- }
-
- } while(1);
- }
-
- /* Catch up */
- filledIp = ip;
- while (((ip>anchor) & (match > lowLimit)) && (unlikely(ip[-1]==match[-1]))) { ip--; match--; }
-
- /* Encode Literals */
- { unsigned const litLength = (unsigned)(ip - anchor);
- token = op++;
- if ((outputDirective == limitedOutput) && /* Check output buffer overflow */
- (unlikely(op + litLength + (2 + 1 + LASTLITERALS) + (litLength/255) > olimit)) ) {
- return 0; /* cannot compress within `dst` budget. Stored indexes in hash table are nonetheless fine */
- }
- if ((outputDirective == fillOutput) &&
- (unlikely(op + (litLength+240)/255 /* litlen */ + litLength /* literals */ + 2 /* offset */ + 1 /* token */ + MFLIMIT - MINMATCH /* min last literals so last match is <= end - MFLIMIT */ > olimit))) {
- op--;
- goto _last_literals;
- }
- if (litLength >= RUN_MASK) {
- int len = (int)(litLength - RUN_MASK);
- *token = (RUN_MASK<<ML_BITS);
- for(; len >= 255 ; len-=255) *op++ = 255;
- *op++ = (BYTE)len;
- }
- else *token = (BYTE)(litLength<<ML_BITS);
-
- /* Copy Literals */
- LZ4_wildCopy8(op, anchor, op+litLength);
- op+=litLength;
- DEBUGLOG(6, "seq.start:%i, literals=%u, match.start:%i",
- (int)(anchor-(const BYTE*)source), litLength, (int)(ip-(const BYTE*)source));
- }
-
-_next_match:
- /* at this stage, the following variables must be correctly set :
- * - ip : at start of LZ operation
- * - match : at start of previous pattern occurence; can be within current prefix, or within extDict
- * - offset : if maybe_ext_memSegment==1 (constant)
- * - lowLimit : must be == dictionary to mean "match is within extDict"; must be == source otherwise
- * - token and *token : position to write 4-bits for match length; higher 4-bits for literal length supposed already written
- */
-
- if ((outputDirective == fillOutput) &&
- (op + 2 /* offset */ + 1 /* token */ + MFLIMIT - MINMATCH /* min last literals so last match is <= end - MFLIMIT */ > olimit)) {
- /* the match was too close to the end, rewind and go to last literals */
- op = token;
- goto _last_literals;
- }
-
- /* Encode Offset */
- if (maybe_extMem) { /* static test */
- DEBUGLOG(6, " with offset=%u (ext if > %i)", offset, (int)(ip - (const BYTE*)source));
- assert(offset <= LZ4_DISTANCE_MAX && offset > 0);
- LZ4_writeLE16(op, (U16)offset); op+=2;
- } else {
- DEBUGLOG(6, " with offset=%u (same segment)", (U32)(ip - match));
- assert(ip-match <= LZ4_DISTANCE_MAX);
- LZ4_writeLE16(op, (U16)(ip - match)); op+=2;
- }
-
- /* Encode MatchLength */
- { unsigned matchCode;
-
- if ( (dictDirective==usingExtDict || dictDirective==usingDictCtx)
- && (lowLimit==dictionary) /* match within extDict */ ) {
- const BYTE* limit = ip + (dictEnd-match);
- assert(dictEnd > match);
- if (limit > matchlimit) limit = matchlimit;
- matchCode = LZ4_count(ip+MINMATCH, match+MINMATCH, limit);
- ip += (size_t)matchCode + MINMATCH;
- if (ip==limit) {
- unsigned const more = LZ4_count(limit, (const BYTE*)source, matchlimit);
- matchCode += more;
- ip += more;
- }
- DEBUGLOG(6, " with matchLength=%u starting in extDict", matchCode+MINMATCH);
- } else {
- matchCode = LZ4_count(ip+MINMATCH, match+MINMATCH, matchlimit);
- ip += (size_t)matchCode + MINMATCH;
- DEBUGLOG(6, " with matchLength=%u", matchCode+MINMATCH);
- }
-
- if ((outputDirective) && /* Check output buffer overflow */
- (unlikely(op + (1 + LASTLITERALS) + (matchCode+240)/255 > olimit)) ) {
- if (outputDirective == fillOutput) {
- /* Match description too long : reduce it */
- U32 newMatchCode = 15 /* in token */ - 1 /* to avoid needing a zero byte */ + ((U32)(olimit - op) - 1 - LASTLITERALS) * 255;
- ip -= matchCode - newMatchCode;
- assert(newMatchCode < matchCode);
- matchCode = newMatchCode;
- if (unlikely(ip <= filledIp)) {
- /* We have already filled up to filledIp so if ip ends up less than filledIp
- * we have positions in the hash table beyond the current position. This is
- * a problem if we reuse the hash table. So we have to remove these positions
- * from the hash table.
- */
- const BYTE* ptr;
- DEBUGLOG(5, "Clearing %u positions", (U32)(filledIp - ip));
- for (ptr = ip; ptr <= filledIp; ++ptr) {
- U32 const h = LZ4_hashPosition(ptr, tableType);
- LZ4_clearHash(h, cctx->hashTable, tableType);
- }
- }
- } else {
- assert(outputDirective == limitedOutput);
- return 0; /* cannot compress within `dst` budget. Stored indexes in hash table are nonetheless fine */
- }
- }
- if (matchCode >= ML_MASK) {
- *token += ML_MASK;
- matchCode -= ML_MASK;
- LZ4_write32(op, 0xFFFFFFFF);
- while (matchCode >= 4*255) {
- op+=4;
- LZ4_write32(op, 0xFFFFFFFF);
- matchCode -= 4*255;
- }
- op += matchCode / 255;
- *op++ = (BYTE)(matchCode % 255);
- } else
- *token += (BYTE)(matchCode);
- }
- /* Ensure we have enough space for the last literals. */
- assert(!(outputDirective == fillOutput && op + 1 + LASTLITERALS > olimit));
-
- anchor = ip;
-
- /* Test end of chunk */
- if (ip >= mflimitPlusOne) break;
-
- /* Fill table */
- LZ4_putPosition(ip-2, cctx->hashTable, tableType, base);
-
- /* Test next position */
- if (tableType == byPtr) {
-
- match = LZ4_getPosition(ip, cctx->hashTable, tableType, base);
- LZ4_putPosition(ip, cctx->hashTable, tableType, base);
- if ( (match+LZ4_DISTANCE_MAX >= ip)
- && (LZ4_read32(match) == LZ4_read32(ip)) )
- { token=op++; *token=0; goto _next_match; }
-
- } else { /* byU32, byU16 */
-
- U32 const h = LZ4_hashPosition(ip, tableType);
- U32 const current = (U32)(ip-base);
- U32 matchIndex = LZ4_getIndexOnHash(h, cctx->hashTable, tableType);
- assert(matchIndex < current);
- if (dictDirective == usingDictCtx) {
- if (matchIndex < startIndex) {
- /* there was no match, try the dictionary */
- matchIndex = LZ4_getIndexOnHash(h, dictCtx->hashTable, byU32);
- match = dictBase + matchIndex;
- lowLimit = dictionary; /* required for match length counter */
- matchIndex += dictDelta;
- } else {
- match = base + matchIndex;
- lowLimit = (const BYTE*)source; /* required for match length counter */
- }
- } else if (dictDirective==usingExtDict) {
- if (matchIndex < startIndex) {
- match = dictBase + matchIndex;
- lowLimit = dictionary; /* required for match length counter */
- } else {
- match = base + matchIndex;
- lowLimit = (const BYTE*)source; /* required for match length counter */
- }
- } else { /* single memory segment */
- match = base + matchIndex;
- }
- LZ4_putIndexOnHash(current, h, cctx->hashTable, tableType);
- assert(matchIndex < current);
- if ( ((dictIssue==dictSmall) ? (matchIndex >= prefixIdxLimit) : 1)
- && (((tableType==byU16) && (LZ4_DISTANCE_MAX == LZ4_DISTANCE_ABSOLUTE_MAX)) ? 1 : (matchIndex+LZ4_DISTANCE_MAX >= current))
- && (LZ4_read32(match) == LZ4_read32(ip)) ) {
- token=op++;
- *token=0;
- if (maybe_extMem) offset = current - matchIndex;
- DEBUGLOG(6, "seq.start:%i, literals=%u, match.start:%i",
- (int)(anchor-(const BYTE*)source), 0, (int)(ip-(const BYTE*)source));
- goto _next_match;
- }
- }
-
- /* Prepare next loop */
- forwardH = LZ4_hashPosition(++ip, tableType);
-
- }
-
-_last_literals:
- /* Encode Last Literals */
- { size_t lastRun = (size_t)(iend - anchor);
- if ( (outputDirective) && /* Check output buffer overflow */
- (op + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > olimit)) {
- if (outputDirective == fillOutput) {
- /* adapt lastRun to fill 'dst' */
- assert(olimit >= op);
- lastRun = (size_t)(olimit-op) - 1;
- lastRun -= (lastRun+240)/255;
- } else {
- assert(outputDirective == limitedOutput);
- return 0; /* cannot compress within `dst` budget. Stored indexes in hash table are nonetheless fine */
- }
- }
- if (lastRun >= RUN_MASK) {
- size_t accumulator = lastRun - RUN_MASK;
- *op++ = RUN_MASK << ML_BITS;
- for(; accumulator >= 255 ; accumulator-=255) *op++ = 255;
- *op++ = (BYTE) accumulator;
- } else {
- *op++ = (BYTE)(lastRun<<ML_BITS);
- }
- memcpy(op, anchor, lastRun);
- ip = anchor + lastRun;
- op += lastRun;
- }
-
- if (outputDirective == fillOutput) {
- *inputConsumed = (int) (((const char*)ip)-source);
- }
- DEBUGLOG(5, "LZ4_compress_generic: compressed %i bytes into %i bytes", inputSize, (int)(((char*)op) - dest));
- result = (int)(((char*)op) - dest);
- assert(result > 0);
- return result;
-}
-
-
-int LZ4_compress_fast_extState(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int acceleration)
-{
- LZ4_stream_t_internal* const ctx = & LZ4_initStream(state, sizeof(LZ4_stream_t)) -> internal_donotuse;
- assert(ctx != NULL);
- if (acceleration < 1) acceleration = ACCELERATION_DEFAULT;
- if (maxOutputSize >= LZ4_compressBound(inputSize)) {
- if (inputSize < LZ4_64Klimit) {
- return LZ4_compress_generic(ctx, source, dest, inputSize, NULL, 0, notLimited, byU16, noDict, noDictIssue, acceleration);
- } else {
- const tableType_t tableType = ((sizeof(void*)==4) && ((uptrval)source > LZ4_DISTANCE_MAX)) ? byPtr : byU32;
- return LZ4_compress_generic(ctx, source, dest, inputSize, NULL, 0, notLimited, tableType, noDict, noDictIssue, acceleration);
- }
- } else {
- if (inputSize < LZ4_64Klimit) {
- return LZ4_compress_generic(ctx, source, dest, inputSize, NULL, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue, acceleration);
- } else {
- const tableType_t tableType = ((sizeof(void*)==4) && ((uptrval)source > LZ4_DISTANCE_MAX)) ? byPtr : byU32;
- return LZ4_compress_generic(ctx, source, dest, inputSize, NULL, maxOutputSize, limitedOutput, tableType, noDict, noDictIssue, acceleration);
- }
- }
-}
-
-static int LZ4_compress_fast(const char* source, char* dest, int inputSize, int maxOutputSize, int acceleration)
-{
- int result;
-#if (LZ4_HEAPMODE)
- LZ4_stream_t* ctxPtr = ALLOC(sizeof(LZ4_stream_t)); /* malloc-calloc always properly aligned */
- if (ctxPtr == NULL) return 0;
-#else
- LZ4_stream_t ctx;
- LZ4_stream_t* const ctxPtr = &ctx;
-#endif
- result = LZ4_compress_fast_extState(ctxPtr, source, dest, inputSize, maxOutputSize, acceleration);
-
-#if (LZ4_HEAPMODE)
- FREEMEM(ctxPtr);
-#endif
- return result;
-}
-
-
-int LZ4_compress_default(const char* src, char* dst, int srcSize, int maxOutputSize)
-{
- return LZ4_compress_fast(src, dst, srcSize, maxOutputSize, 1);
-}
-
-/*-******************************
-* Streaming functions
-********************************/
-
-#ifndef _MSC_VER /* for some reason, Visual fails the aligment test on 32-bit x86 :
- it reports an aligment of 8-bytes,
- while actually aligning LZ4_stream_t on 4 bytes. */
-static size_t LZ4_stream_t_alignment(void)
-{
- struct { char c; LZ4_stream_t t; } t_a;
- return sizeof(t_a) - sizeof(t_a.t);
-}
-#endif
-
-LZ4_stream_t* LZ4_initStream (void* buffer, size_t size)
-{
- DEBUGLOG(5, "LZ4_initStream");
- if (buffer == NULL) { return NULL; }
- if (size < sizeof(LZ4_stream_t)) { return NULL; }
-#ifndef _MSC_VER /* for some reason, Visual fails the aligment test on 32-bit x86 :
- it reports an aligment of 8-bytes,
- while actually aligning LZ4_stream_t on 4 bytes. */
- if (((size_t)buffer) & (LZ4_stream_t_alignment() - 1)) { return NULL; } /* alignment check */
-#endif
- MEM_INIT(buffer, 0, sizeof(LZ4_stream_t));
- return (LZ4_stream_t*)buffer;
-}
-
-/*-*******************************
- * Decompression functions
- ********************************/
-
-typedef enum { endOnOutputSize = 0, endOnInputSize = 1 } endCondition_directive;
-typedef enum { decode_full_block = 0, partial_decode = 1 } earlyEnd_directive;
-
-#undef MIN
-#define MIN(a,b) ( (a) < (b) ? (a) : (b) )
-
-/* Read the variable-length literal or match length.
- *
- * ip - pointer to use as input.
- * lencheck - end ip. Return an error if ip advances >= lencheck.
- * loop_check - check ip >= lencheck in body of loop. Returns loop_error if so.
- * initial_check - check ip >= lencheck before start of loop. Returns initial_error if so.
- * error (output) - error code. Should be set to 0 before call.
- */
-typedef enum { loop_error = -2, initial_error = -1, ok = 0 } variable_length_error;
-LZ4_FORCE_INLINE unsigned
-read_variable_length(const BYTE**ip, const BYTE* lencheck, int loop_check, int initial_check, variable_length_error* error)
-{
- unsigned length = 0;
- unsigned s;
- if (initial_check && unlikely((*ip) >= lencheck)) { /* overflow detection */
- *error = initial_error;
- return length;
- }
- do {
- s = **ip;
- (*ip)++;
- length += s;
- if (loop_check && unlikely((*ip) >= lencheck)) { /* overflow detection */
- *error = loop_error;
- return length;
- }
- } while (s==255);
-
- return length;
-}
-
-/*! LZ4_decompress_generic() :
- * This generic decompression function covers all use cases.
- * It shall be instantiated several times, using different sets of directives.
- * Note that it is important for performance that this function really get inlined,
- * in order to remove useless branches during compilation optimization.
- */
-LZ4_FORCE_INLINE int
-LZ4_decompress_generic(
- const char* const src,
- char* const dst,
- int srcSize,
- int outputSize, /* If endOnInput==endOnInputSize, this value is `dstCapacity` */
-
- endCondition_directive endOnInput, /* endOnOutputSize, endOnInputSize */
- earlyEnd_directive partialDecoding, /* full, partial */
- dict_directive dict, /* noDict, withPrefix64k, usingExtDict */
- const BYTE* const lowPrefix, /* always <= dst, == dst when no prefix */
- const BYTE* const dictStart, /* only if dict==usingExtDict */
- const size_t dictSize /* note : = 0 if noDict */
- )
-{
- if (src == NULL) { return -1; }
-
- { const BYTE* ip = (const BYTE*) src;
- const BYTE* const iend = ip + srcSize;
-
- BYTE* op = (BYTE*) dst;
- BYTE* const oend = op + outputSize;
- BYTE* cpy;
-
- const BYTE* const dictEnd = (dictStart == NULL) ? NULL : dictStart + dictSize;
-
- const int safeDecode = (endOnInput==endOnInputSize);
- const int checkOffset = ((safeDecode) && (dictSize < (int)(64 KB)));
-
-
- /* Set up the "end" pointers for the shortcut. */
- const BYTE* const shortiend = iend - (endOnInput ? 14 : 8) /*maxLL*/ - 2 /*offset*/;
- const BYTE* const shortoend = oend - (endOnInput ? 14 : 8) /*maxLL*/ - 18 /*maxML*/;
-
- const BYTE* match;
- size_t offset;
- unsigned token;
- size_t length;
-
-
- DEBUGLOG(5, "LZ4_decompress_generic (srcSize:%i, dstSize:%i)", srcSize, outputSize);
-
- /* Special cases */
- assert(lowPrefix <= op);
- if ((endOnInput) && (unlikely(outputSize==0))) {
- /* Empty output buffer */
- if (partialDecoding) return 0;
- return ((srcSize==1) && (*ip==0)) ? 0 : -1;
- }
- if ((!endOnInput) && (unlikely(outputSize==0))) { return (*ip==0 ? 1 : -1); }
- if ((endOnInput) && unlikely(srcSize==0)) { return -1; }
-
- /* Currently the fast loop shows a regression on qualcomm arm chips. */
-#if LZ4_FAST_DEC_LOOP
- if ((oend - op) < FASTLOOP_SAFE_DISTANCE) {
- DEBUGLOG(6, "skip fast decode loop");
- goto safe_decode;
- }
-
- /* Fast loop : decode sequences as long as output < iend-FASTLOOP_SAFE_DISTANCE */
- while (1) {
- /* Main fastloop assertion: We can always wildcopy FASTLOOP_SAFE_DISTANCE */
- assert(oend - op >= FASTLOOP_SAFE_DISTANCE);
- if (endOnInput) { assert(ip < iend); }
- token = *ip++;
- length = token >> ML_BITS; /* literal length */
-
- assert(!endOnInput || ip <= iend); /* ip < iend before the increment */
-
- /* decode literal length */
- if (length == RUN_MASK) {
- variable_length_error error = ok;
- length += read_variable_length(&ip, iend-RUN_MASK, endOnInput, endOnInput, &error);
- if (error == initial_error) { goto _output_error; }
- if ((safeDecode) && unlikely((uptrval)(op)+length<(uptrval)(op))) { goto _output_error; } /* overflow detection */
- if ((safeDecode) && unlikely((uptrval)(ip)+length<(uptrval)(ip))) { goto _output_error; } /* overflow detection */
-
- /* copy literals */
- cpy = op+length;
- LZ4_STATIC_ASSERT(MFLIMIT >= WILDCOPYLENGTH);
- if (endOnInput) { /* LZ4_decompress_safe() */
- if ((cpy>oend-32) || (ip+length>iend-32)) { goto safe_literal_copy; }
- LZ4_wildCopy32(op, ip, cpy);
- } else { /* LZ4_decompress_fast() */
- if (cpy>oend-8) { goto safe_literal_copy; }
- LZ4_wildCopy8(op, ip, cpy); /* LZ4_decompress_fast() cannot copy more than 8 bytes at a time :
- * it doesn't know input length, and only relies on end-of-block properties */
- }
- ip += length; op = cpy;
- } else {
- cpy = op+length;
- if (endOnInput) { /* LZ4_decompress_safe() */
- DEBUGLOG(7, "copy %u bytes in a 16-bytes stripe", (unsigned)length);
- /* We don't need to check oend, since we check it once for each loop below */
- if (ip > iend-(16 + 1/*max lit + offset + nextToken*/)) { goto safe_literal_copy; }
- /* Literals can only be 14, but hope compilers optimize if we copy by a register size */
- memcpy(op, ip, 16);
- } else { /* LZ4_decompress_fast() */
- /* LZ4_decompress_fast() cannot copy more than 8 bytes at a time :
- * it doesn't know input length, and relies on end-of-block properties */
- memcpy(op, ip, 8);
- if (length > 8) { memcpy(op+8, ip+8, 8); }
- }
- ip += length; op = cpy;
- }
-
- /* get offset */
- offset = LZ4_readLE16(ip); ip+=2;
- match = op - offset;
- assert(match <= op);
-
- /* get matchlength */
- length = token & ML_MASK;
-
- if (length == ML_MASK) {
- variable_length_error error = ok;
- if ((checkOffset) && (unlikely(match + dictSize < lowPrefix))) { goto _output_error; } /* Error : offset outside buffers */
- length += read_variable_length(&ip, iend - LASTLITERALS + 1, endOnInput, 0, &error);
- if (error != ok) { goto _output_error; }
- if ((safeDecode) && unlikely((uptrval)(op)+length<(uptrval)op)) { goto _output_error; } /* overflow detection */
- length += MINMATCH;
- if (op + length >= oend - FASTLOOP_SAFE_DISTANCE) {
- goto safe_match_copy;
- }
- } else {
- length += MINMATCH;
- if (op + length >= oend - FASTLOOP_SAFE_DISTANCE) {
- goto safe_match_copy;
- }
-
- /* Fastpath check: Avoids a branch in LZ4_wildCopy32 if true */
- if ((dict == withPrefix64k) || (match >= lowPrefix)) {
- if (offset >= 8) {
- assert(match >= lowPrefix);
- assert(match <= op);
- assert(op + 18 <= oend);
-
- memcpy(op, match, 8);
- memcpy(op+8, match+8, 8);
- memcpy(op+16, match+16, 2);
- op += length;
- continue;
- } } }
-
- if ((checkOffset) && (unlikely(match + dictSize < lowPrefix))) { goto _output_error; } /* Error : offset outside buffers */
- /* match starting within external dictionary */
- if ((dict==usingExtDict) && (match < lowPrefix)) {
- if (unlikely(op+length > oend-LASTLITERALS)) {
- if (partialDecoding) {
- length = MIN(length, (size_t)(oend-op)); /* reach end of buffer */
- } else {
- goto _output_error; /* end-of-block condition violated */
- } }
-
- if (length <= (size_t)(lowPrefix-match)) {
- /* match fits entirely within external dictionary : just copy */
- memmove(op, dictEnd - (lowPrefix-match), length);
- op += length;
- } else {
- /* match stretches into both external dictionary and current block */
- size_t const copySize = (size_t)(lowPrefix - match);
- size_t const restSize = length - copySize;
- memcpy(op, dictEnd - copySize, copySize);
- op += copySize;
- if (restSize > (size_t)(op - lowPrefix)) { /* overlap copy */
- BYTE* const endOfMatch = op + restSize;
- const BYTE* copyFrom = lowPrefix;
- while (op < endOfMatch) { *op++ = *copyFrom++; }
- } else {
- memcpy(op, lowPrefix, restSize);
- op += restSize;
- } }
- continue;
- }
-
- /* copy match within block */
- cpy = op + length;
-
- assert((op <= oend) && (oend-op >= 32));
- if (unlikely(offset<16)) {
- LZ4_memcpy_using_offset(op, match, cpy, offset);
- } else {
- LZ4_wildCopy32(op, match, cpy);
- }
-
- op = cpy; /* wildcopy correction */
- }
- safe_decode:
-#endif
-
- /* Main Loop : decode remaining sequences where output < FASTLOOP_SAFE_DISTANCE */
- while (1) {
- token = *ip++;
- length = token >> ML_BITS; /* literal length */
-
- assert(!endOnInput || ip <= iend); /* ip < iend before the increment */
-
- /* A two-stage shortcut for the most common case:
- * 1) If the literal length is 0..14, and there is enough space,
- * enter the shortcut and copy 16 bytes on behalf of the literals
- * (in the fast mode, only 8 bytes can be safely copied this way).
- * 2) Further if the match length is 4..18, copy 18 bytes in a similar
- * manner; but we ensure that there's enough space in the output for
- * those 18 bytes earlier, upon entering the shortcut (in other words,
- * there is a combined check for both stages).
- */
- if ( (endOnInput ? length != RUN_MASK : length <= 8)
- /* strictly "less than" on input, to re-enter the loop with at least one byte */
- && likely((endOnInput ? ip < shortiend : 1) & (op <= shortoend)) ) {
- /* Copy the literals */
- memcpy(op, ip, endOnInput ? 16 : 8);
- op += length; ip += length;
-
- /* The second stage: prepare for match copying, decode full info.
- * If it doesn't work out, the info won't be wasted. */
- length = token & ML_MASK; /* match length */
- offset = LZ4_readLE16(ip); ip += 2;
- match = op - offset;
- assert(match <= op); /* check overflow */
-
- /* Do not deal with overlapping matches. */
- if ( (length != ML_MASK)
- && (offset >= 8)
- && (dict==withPrefix64k || match >= lowPrefix) ) {
- /* Copy the match. */
- memcpy(op + 0, match + 0, 8);
- memcpy(op + 8, match + 8, 8);
- memcpy(op +16, match +16, 2);
- op += length + MINMATCH;
- /* Both stages worked, load the next token. */
- continue;
- }
-
- /* The second stage didn't work out, but the info is ready.
- * Propel it right to the point of match copying. */
- goto _copy_match;
- }
-
- /* decode literal length */
- if (length == RUN_MASK) {
- variable_length_error error = ok;
- length += read_variable_length(&ip, iend-RUN_MASK, endOnInput, endOnInput, &error);
- if (error == initial_error) { goto _output_error; }
- if ((safeDecode) && unlikely((uptrval)(op)+length<(uptrval)(op))) { goto _output_error; } /* overflow detection */
- if ((safeDecode) && unlikely((uptrval)(ip)+length<(uptrval)(ip))) { goto _output_error; } /* overflow detection */
- }
-
- /* copy literals */
- cpy = op+length;
-#if LZ4_FAST_DEC_LOOP
- safe_literal_copy:
-#endif
- LZ4_STATIC_ASSERT(MFLIMIT >= WILDCOPYLENGTH);
- if ( ((endOnInput) && ((cpy>oend-MFLIMIT) || (ip+length>iend-(2+1+LASTLITERALS))) )
- || ((!endOnInput) && (cpy>oend-WILDCOPYLENGTH)) )
- {
- /* We've either hit the input parsing restriction or the output parsing restriction.
- * If we've hit the input parsing condition then this must be the last sequence.
- * If we've hit the output parsing condition then we are either using partialDecoding
- * or we've hit the output parsing condition.
- */
- if (partialDecoding) {
- /* Since we are partial decoding we may be in this block because of the output parsing
- * restriction, which is not valid since the output buffer is allowed to be undersized.
- */
- assert(endOnInput);
- /* If we're in this block because of the input parsing condition, then we must be on the
- * last sequence (or invalid), so we must check that we exactly consume the input.
- */
- if ((ip+length>iend-(2+1+LASTLITERALS)) && (ip+length != iend)) { goto _output_error; }
- assert(ip+length <= iend);
- /* We are finishing in the middle of a literals segment.
- * Break after the copy.
- */
- if (cpy > oend) {
- cpy = oend;
- assert(op<=oend);
- length = (size_t)(oend-op);
- }
- assert(ip+length <= iend);
- } else {
- /* We must be on the last sequence because of the parsing limitations so check
- * that we exactly regenerate the original size (must be exact when !endOnInput).
- */
- if ((!endOnInput) && (cpy != oend)) { goto _output_error; }
- /* We must be on the last sequence (or invalid) because of the parsing limitations
- * so check that we exactly consume the input and don't overrun the output buffer.
- */
- if ((endOnInput) && ((ip+length != iend) || (cpy > oend))) { goto _output_error; }
- }
- memmove(op, ip, length); /* supports overlapping memory regions, which only matters for in-place decompression scenarios */
- ip += length;
- op += length;
- /* Necessarily EOF when !partialDecoding. When partialDecoding
- * it is EOF if we've either filled the output buffer or hit
- * the input parsing restriction.
- */
- if (!partialDecoding || (cpy == oend) || (ip == iend)) {
- break;
- }
- } else {
- LZ4_wildCopy8(op, ip, cpy); /* may overwrite up to WILDCOPYLENGTH beyond cpy */
- ip += length; op = cpy;
- }
-
- /* get offset */
- offset = LZ4_readLE16(ip); ip+=2;
- match = op - offset;
-
- /* get matchlength */
- length = token & ML_MASK;
-
- _copy_match:
- if (length == ML_MASK) {
- variable_length_error error = ok;
- length += read_variable_length(&ip, iend - LASTLITERALS + 1, endOnInput, 0, &error);
- if (error != ok) goto _output_error;
- if ((safeDecode) && unlikely((uptrval)(op)+length<(uptrval)op)) goto _output_error; /* overflow detection */
- }
- length += MINMATCH;
-
-#if LZ4_FAST_DEC_LOOP
- safe_match_copy:
-#endif
- if ((checkOffset) && (unlikely(match + dictSize < lowPrefix))) goto _output_error; /* Error : offset outside buffers */
- /* match starting within external dictionary */
- if ((dict==usingExtDict) && (match < lowPrefix)) {
- if (unlikely(op+length > oend-LASTLITERALS)) {
- if (partialDecoding) length = MIN(length, (size_t)(oend-op));
- else goto _output_error; /* doesn't respect parsing restriction */
- }
-
- if (length <= (size_t)(lowPrefix-match)) {
- /* match fits entirely within external dictionary : just copy */
- memmove(op, dictEnd - (lowPrefix-match), length);
- op += length;
- } else {
- /* match stretches into both external dictionary and current block */
- size_t const copySize = (size_t)(lowPrefix - match);
- size_t const restSize = length - copySize;
- memcpy(op, dictEnd - copySize, copySize);
- op += copySize;
- if (restSize > (size_t)(op - lowPrefix)) { /* overlap copy */
- BYTE* const endOfMatch = op + restSize;
- const BYTE* copyFrom = lowPrefix;
- while (op < endOfMatch) *op++ = *copyFrom++;
- } else {
- memcpy(op, lowPrefix, restSize);
- op += restSize;
- } }
- continue;
- }
- assert(match >= lowPrefix);
-
- /* copy match within block */
- cpy = op + length;
-
- /* partialDecoding : may end anywhere within the block */
- assert(op<=oend);
- if (partialDecoding && (cpy > oend-MATCH_SAFEGUARD_DISTANCE)) {
- size_t const mlen = MIN(length, (size_t)(oend-op));
- const BYTE* const matchEnd = match + mlen;
- BYTE* const copyEnd = op + mlen;
- if (matchEnd > op) { /* overlap copy */
- while (op < copyEnd) { *op++ = *match++; }
- } else {
- memcpy(op, match, mlen);
- }
- op = copyEnd;
- if (op == oend) { break; }
- continue;
- }
-
- if (unlikely(offset<8)) {
- LZ4_write32(op, 0); /* silence msan warning when offset==0 */
- op[0] = match[0];
- op[1] = match[1];
- op[2] = match[2];
- op[3] = match[3];
- match += inc32table[offset];
- memcpy(op+4, match, 4);
- match -= dec64table[offset];
- } else {
- memcpy(op, match, 8);
- match += 8;
- }
- op += 8;
-
- if (unlikely(cpy > oend-MATCH_SAFEGUARD_DISTANCE)) {
- BYTE* const oCopyLimit = oend - (WILDCOPYLENGTH-1);
- if (cpy > oend-LASTLITERALS) { goto _output_error; } /* Error : last LASTLITERALS bytes must be literals (uncompressed) */
- if (op < oCopyLimit) {
- LZ4_wildCopy8(op, match, oCopyLimit);
- match += oCopyLimit - op;
- op = oCopyLimit;
- }
- while (op < cpy) { *op++ = *match++; }
- } else {
- memcpy(op, match, 8);
- if (length > 16) { LZ4_wildCopy8(op+8, match+8, cpy); }
- }
- op = cpy; /* wildcopy correction */
- }
-
- /* end of decoding */
- if (endOnInput) {
- return (int) (((char*)op)-dst); /* Nb of output bytes decoded */
- } else {
- return (int) (((const char*)ip)-src); /* Nb of input bytes read */
- }
-
- /* Overflow error detected */
- _output_error:
- return (int) (-(((const char*)ip)-src))-1;
- }
-}
-
-
-/*===== Instantiate the API decoding functions. =====*/
-
-LZ4_FORCE_O2_GCC_PPC64LE
-int LZ4_decompress_safe(const char* source, char* dest, int compressedSize, int maxDecompressedSize)
-{
- return LZ4_decompress_generic(source, dest, compressedSize, maxDecompressedSize,
- endOnInputSize, decode_full_block, noDict,
- (BYTE*)dest, NULL, 0);
-}
-
-#endif /* LZ4_COMMONDEFS_ONLY */
diff --git a/lib/sqfs/comp/lz4/lz4.h b/lib/sqfs/comp/lz4/lz4.h
deleted file mode 100644
index 43d3b14..0000000
--- a/lib/sqfs/comp/lz4/lz4.h
+++ /dev/null
@@ -1,341 +0,0 @@
-/*
- * LZ4 - Fast LZ compression algorithm
- * Header File
- * Copyright (C) 2011-present, Yann Collet.
-
- BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions are
- met:
-
- * Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above
- copyright notice, this list of conditions and the following disclaimer
- in the documentation and/or other materials provided with the
- distribution.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- You can contact the author at :
- - LZ4 homepage : http://www.lz4.org
- - LZ4 source repository : https://github.com/lz4/lz4
-*/
-#if defined (__cplusplus)
-extern "C" {
-#endif
-
-#ifndef LZ4_H_2983827168210
-#define LZ4_H_2983827168210
-
-/* --- Dependency --- */
-#include <stddef.h> /* size_t */
-
-
-/**
- Introduction
-
- LZ4 is lossless compression algorithm, providing compression speed >500 MB/s per core,
- scalable with multi-cores CPU. It features an extremely fast decoder, with speed in
- multiple GB/s per core, typically reaching RAM speed limits on multi-core systems.
-
- The LZ4 compression library provides in-memory compression and decompression functions.
- It gives full buffer control to user.
- Compression can be done in:
- - a single step (described as Simple Functions)
- - a single step, reusing a context (described in Advanced Functions)
- - unbounded multiple steps (described as Streaming compression)
-
- lz4.h generates and decodes LZ4-compressed blocks (doc/lz4_Block_format.md).
- Decompressing such a compressed block requires additional metadata.
- Exact metadata depends on exact decompression function.
- For the typical case of LZ4_decompress_safe(),
- metadata includes block's compressed size, and maximum bound of decompressed size.
- Each application is free to encode and pass such metadata in whichever way it wants.
-
- lz4.h only handle blocks, it can not generate Frames.
-
- Blocks are different from Frames (doc/lz4_Frame_format.md).
- Frames bundle both blocks and metadata in a specified manner.
- Embedding metadata is required for compressed data to be self-contained and portable.
- Frame format is delivered through a companion API, declared in lz4frame.h.
- The `lz4` CLI can only manage frames.
-*/
-
-/*^***************************************************************
-* Export parameters
-*****************************************************************/
-/*
-* LZ4_DLL_EXPORT :
-* Enable exporting of functions when building a Windows DLL
-* LZ4LIB_VISIBILITY :
-* Control library symbols visibility.
-*/
-#ifndef LZ4LIB_VISIBILITY
-# if defined(__GNUC__) && (__GNUC__ >= 4)
-# define LZ4LIB_VISIBILITY __attribute__ ((visibility ("hidden")))
-# else
-# define LZ4LIB_VISIBILITY
-# endif
-#endif
-
-#define LZ4LIB_API LZ4LIB_VISIBILITY
-
-/*------ Version ------*/
-#define LZ4_QUOTE(str) #str
-#define LZ4_EXPAND_AND_QUOTE(str) LZ4_QUOTE(str)
-#define LZ4_VERSION_STRING LZ4_EXPAND_AND_QUOTE(LZ4_LIB_VERSION)
-
-/*-************************************
-* Tuning parameter
-**************************************/
-/*!
- * LZ4_MEMORY_USAGE :
- * Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.)
- * Increasing memory usage improves compression ratio.
- * Reduced memory usage may improve speed, thanks to better cache locality.
- * Default value is 14, for 16KB, which nicely fits into Intel x86 L1 cache
- */
-#ifndef LZ4_MEMORY_USAGE
-# define LZ4_MEMORY_USAGE 14
-#endif
-
-
-/*-************************************
-* Simple Functions
-**************************************/
-/*! LZ4_compress_default() :
- * Compresses 'srcSize' bytes from buffer 'src'
- * into already allocated 'dst' buffer of size 'dstCapacity'.
- * Compression is guaranteed to succeed if 'dstCapacity' >= LZ4_compressBound(srcSize).
- * It also runs faster, so it's a recommended setting.
- * If the function cannot compress 'src' into a more limited 'dst' budget,
- * compression stops *immediately*, and the function result is zero.
- * In which case, 'dst' content is undefined (invalid).
- * srcSize : max supported value is LZ4_MAX_INPUT_SIZE.
- * dstCapacity : size of buffer 'dst' (which must be already allocated)
- * @return : the number of bytes written into buffer 'dst' (necessarily <= dstCapacity)
- * or 0 if compression fails
- * Note : This function is protected against buffer overflow scenarios (never writes outside 'dst' buffer, nor read outside 'source' buffer).
- */
-LZ4LIB_API int LZ4_compress_default(const char* src, char* dst, int srcSize, int dstCapacity);
-
-/*! LZ4_decompress_safe() :
- * compressedSize : is the exact complete size of the compressed block.
- * dstCapacity : is the size of destination buffer (which must be already allocated), presumed an upper bound of decompressed size.
- * @return : the number of bytes decompressed into destination buffer (necessarily <= dstCapacity)
- * If destination buffer is not large enough, decoding will stop and output an error code (negative value).
- * If the source stream is detected malformed, the function will stop decoding and return a negative result.
- * Note 1 : This function is protected against malicious data packets :
- * it will never writes outside 'dst' buffer, nor read outside 'source' buffer,
- * even if the compressed block is maliciously modified to order the decoder to do these actions.
- * In such case, the decoder stops immediately, and considers the compressed block malformed.
- * Note 2 : compressedSize and dstCapacity must be provided to the function, the compressed block does not contain them.
- * The implementation is free to send / store / derive this information in whichever way is most beneficial.
- * If there is a need for a different format which bundles together both compressed data and its metadata, consider looking at lz4frame.h instead.
- */
-LZ4LIB_API int LZ4_decompress_safe (const char* src, char* dst, int compressedSize, int dstCapacity);
-
-
-/*-************************************
-* Advanced Functions
-**************************************/
-#define LZ4_MAX_INPUT_SIZE 0x7E000000 /* 2 113 929 216 bytes */
-#define LZ4_COMPRESSBOUND(isize) ((unsigned)(isize) > (unsigned)LZ4_MAX_INPUT_SIZE ? 0 : (isize) + ((isize)/255) + 16)
-
-/*! LZ4_compressBound() :
- Provides the maximum size that LZ4 compression may output in a "worst case" scenario (input data not compressible)
- This function is primarily useful for memory allocation purposes (destination buffer size).
- Macro LZ4_COMPRESSBOUND() is also provided for compilation-time evaluation (stack memory allocation for example).
- Note that LZ4_compress_default() compresses faster when dstCapacity is >= LZ4_compressBound(srcSize)
- inputSize : max supported value is LZ4_MAX_INPUT_SIZE
- return : maximum output size in a "worst case" scenario
- or 0, if input size is incorrect (too large or negative)
-*/
-LZ4LIB_API int LZ4_compressBound(int inputSize);
-
-
-/*! LZ4_compress_fast_extState() :
- * Same as LZ4_compress_fast(), using an externally allocated memory space for its state.
- * Use LZ4_sizeofState() to know how much memory must be allocated,
- * and allocate it on 8-bytes boundaries (using `malloc()` typically).
- * Then, provide this buffer as `void* state` to compression function.
- */
-LZ4LIB_API int LZ4_sizeofState(void);
-LZ4LIB_API int LZ4_compress_fast_extState (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
-
-/*-*********************************************
-* Streaming Compression Functions
-***********************************************/
-typedef union LZ4_stream_u LZ4_stream_t; /* incomplete type (defined later) */
-
-/*-**********************************************
-* Streaming Decompression Functions
-* Bufferless synchronous API
-************************************************/
-typedef union LZ4_streamDecode_u LZ4_streamDecode_t; /* tracking context */
-
-#endif /* LZ4_H_2983827168210 */
-
-
-/*^*************************************
- * !!!!!! STATIC LINKING ONLY !!!!!!
- ***************************************/
-
-/*-****************************************************************************
- * Experimental section
- *
- * Symbols declared in this section must be considered unstable. Their
- * signatures or semantics may change, or they may be removed altogether in the
- * future. They are therefore only safe to depend on when the caller is
- * statically linked against the library.
- *
- * To protect against unsafe usage, not only are the declarations guarded,
- * the definitions are hidden by default
- * when building LZ4 as a shared/dynamic library.
- *
- * In order to access these declarations,
- * define LZ4_STATIC_LINKING_ONLY in your application
- * before including LZ4's headers.
- *
- * In order to make their implementations accessible dynamically, you must
- * define LZ4_PUBLISH_STATIC_FUNCTIONS when building the LZ4 library.
- ******************************************************************************/
-
-#ifdef LZ4_STATIC_LINKING_ONLY
-
-#ifndef LZ4_STATIC_3504398509
-#define LZ4_STATIC_3504398509
-
-#define LZ4LIB_STATIC_API LZ4LIB_API
-
-#ifndef LZ4_DISTANCE_MAX /* history window size; can be user-defined at compile time */
-# define LZ4_DISTANCE_MAX 65535 /* set to maximum value by default */
-#endif
-
-#endif /* LZ4_STATIC_3504398509 */
-#endif /* LZ4_STATIC_LINKING_ONLY */
-
-
-
-#ifndef LZ4_H_98237428734687
-#define LZ4_H_98237428734687
-
-/*-************************************************************
- * PRIVATE DEFINITIONS
- **************************************************************
- * Do not use these definitions directly.
- * They are only exposed to allow static allocation of `LZ4_stream_t` and `LZ4_streamDecode_t`.
- * Accessing members will expose code to API and/or ABI break in future versions of the library.
- **************************************************************/
-#define LZ4_HASHLOG (LZ4_MEMORY_USAGE-2)
-#define LZ4_HASHTABLESIZE (1 << LZ4_MEMORY_USAGE)
-#define LZ4_HASH_SIZE_U32 (1 << LZ4_HASHLOG) /* required as macro for static allocation */
-
-#if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
-#include <stdint.h>
-
-typedef struct LZ4_stream_t_internal LZ4_stream_t_internal;
-struct LZ4_stream_t_internal {
- uint32_t hashTable[LZ4_HASH_SIZE_U32];
- uint32_t currentOffset;
- uint16_t dirty;
- uint16_t tableType;
- const uint8_t* dictionary;
- const LZ4_stream_t_internal* dictCtx;
- uint32_t dictSize;
-};
-
-typedef struct {
- const uint8_t* externalDict;
- size_t extDictSize;
- const uint8_t* prefixEnd;
- size_t prefixSize;
-} LZ4_streamDecode_t_internal;
-
-#else
-
-typedef struct LZ4_stream_t_internal LZ4_stream_t_internal;
-struct LZ4_stream_t_internal {
- unsigned int hashTable[LZ4_HASH_SIZE_U32];
- unsigned int currentOffset;
- unsigned short dirty;
- unsigned short tableType;
- const unsigned char* dictionary;
- const LZ4_stream_t_internal* dictCtx;
- unsigned int dictSize;
-};
-
-typedef struct {
- const unsigned char* externalDict;
- const unsigned char* prefixEnd;
- size_t extDictSize;
- size_t prefixSize;
-} LZ4_streamDecode_t_internal;
-
-#endif
-
-/*! LZ4_stream_t :
- * information structure to track an LZ4 stream.
- * LZ4_stream_t can also be created using LZ4_createStream(), which is recommended.
- * The structure definition can be convenient for static allocation
- * (on stack, or as part of larger structure).
- * Init this structure with LZ4_initStream() before first use.
- * note : only use this definition in association with static linking !
- * this definition is not API/ABI safe, and may change in a future version.
- */
-#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4 + ((sizeof(void*)==16) ? 4 : 0) /*AS-400*/ )
-#define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U64 * sizeof(unsigned long long))
-union LZ4_stream_u {
- unsigned long long table[LZ4_STREAMSIZE_U64];
- LZ4_stream_t_internal internal_donotuse;
-} ; /* previously typedef'd to LZ4_stream_t */
-
-/*! LZ4_initStream() : v1.9.0+
- * An LZ4_stream_t structure must be initialized at least once.
- * This is automatically done when invoking LZ4_createStream(),
- * but it's not when the structure is simply declared on stack (for example).
- *
- * Use LZ4_initStream() to properly initialize a newly declared LZ4_stream_t.
- * It can also initialize any arbitrary buffer of sufficient size,
- * and will @return a pointer of proper type upon initialization.
- *
- * Note : initialization fails if size and alignment conditions are not respected.
- * In which case, the function will @return NULL.
- * Note2: An LZ4_stream_t structure guarantees correct alignment and size.
- * Note3: Before v1.9.0, use LZ4_resetStream() instead
- */
-LZ4LIB_API LZ4_stream_t* LZ4_initStream (void* buffer, size_t size);
-
-
-/*! LZ4_streamDecode_t :
- * information structure to track an LZ4 stream during decompression.
- * init this structure using LZ4_setStreamDecode() before first use.
- * note : only use in association with static linking !
- * this definition is not API/ABI safe,
- * and may change in a future version !
- */
-#define LZ4_STREAMDECODESIZE_U64 (4 + ((sizeof(void*)==16) ? 2 : 0) /*AS-400*/ )
-#define LZ4_STREAMDECODESIZE (LZ4_STREAMDECODESIZE_U64 * sizeof(unsigned long long))
-union LZ4_streamDecode_u {
- unsigned long long table[LZ4_STREAMDECODESIZE_U64];
- LZ4_streamDecode_t_internal internal_donotuse;
-} ; /* previously typedef'd to LZ4_streamDecode_t */
-
-#endif /* LZ4_H_98237428734687 */
-
-
-#if defined (__cplusplus)
-}
-#endif
diff --git a/lib/sqfs/comp/lz4/lz4hc.c b/lib/sqfs/comp/lz4/lz4hc.c
deleted file mode 100644
index 4bdf96e..0000000
--- a/lib/sqfs/comp/lz4/lz4hc.c
+++ /dev/null
@@ -1,1343 +0,0 @@
-/*
- LZ4 HC - High Compression Mode of LZ4
- Copyright (C) 2011-2017, Yann Collet.
-
- BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions are
- met:
-
- * Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above
- copyright notice, this list of conditions and the following disclaimer
- in the documentation and/or other materials provided with the
- distribution.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- You can contact the author at :
- - LZ4 source repository : https://github.com/lz4/lz4
- - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
-*/
-/* note : lz4hc is not an independent module, it requires lz4.h/lz4.c for proper compilation */
-
-
-/* *************************************
-* Tuning Parameter
-***************************************/
-
-/*! HEAPMODE :
- * Select how default compression function will allocate workplace memory,
- * in stack (0:fastest), or in heap (1:requires malloc()).
- * Since workplace is rather large, heap mode is recommended.
- */
-#ifndef LZ4HC_HEAPMODE
-# define LZ4HC_HEAPMODE 1
-#endif
-
-
-/*=== Dependency ===*/
-#define LZ4_HC_STATIC_LINKING_ONLY
-#include "lz4hc.h"
-
-
-/*=== Common LZ4 definitions ===*/
-#if defined(__GNUC__)
-# pragma GCC diagnostic ignored "-Wunused-function"
-#endif
-#if defined (__clang__)
-# pragma clang diagnostic ignored "-Wunused-function"
-#endif
-
-/*=== Enums ===*/
-typedef enum { noDictCtx, usingDictCtxHc } dictCtx_directive;
-
-
-#define LZ4_COMMONDEFS_ONLY
-#ifndef LZ4_SRC_INCLUDED
-#include "lz4.c" /* LZ4_count, constants, mem */
-#endif
-
-/*=== Constants ===*/
-#define OPTIMAL_ML (int)((ML_MASK-1)+MINMATCH)
-#define LZ4_OPT_NUM (1<<12)
-
-
-/*=== Macros ===*/
-#define MIN(a,b) ( (a) < (b) ? (a) : (b) )
-#define MAX(a,b) ( (a) > (b) ? (a) : (b) )
-#define HASH_FUNCTION(i) (((i) * 2654435761U) >> ((MINMATCH*8)-LZ4HC_HASH_LOG))
-#define DELTANEXTMAXD(p) chainTable[(p) & LZ4HC_MAXD_MASK] /* flexible, LZ4HC_MAXD dependent */
-#define DELTANEXTU16(table, pos) table[(U16)(pos)] /* faster */
-/* Make fields passed to, and updated by LZ4HC_encodeSequence explicit */
-#define UPDATABLE(ip, op, anchor) &ip, &op, &anchor
-
-static U32 LZ4HC_hashPtr(const void* ptr) { return HASH_FUNCTION(LZ4_read32(ptr)); }
-
-
-/**************************************
-* HC Compression
-**************************************/
-static void LZ4HC_clearTables (LZ4HC_CCtx_internal* hc4)
-{
- MEM_INIT((void*)hc4->hashTable, 0, sizeof(hc4->hashTable));
- MEM_INIT(hc4->chainTable, 0xFF, sizeof(hc4->chainTable));
-}
-
-static void LZ4HC_init_internal (LZ4HC_CCtx_internal* hc4, const BYTE* start)
-{
- uptrval startingOffset = (uptrval)(hc4->end - hc4->base);
- if (startingOffset > 1 GB) {
- LZ4HC_clearTables(hc4);
- startingOffset = 0;
- }
- startingOffset += 64 KB;
- hc4->nextToUpdate = (U32) startingOffset;
- hc4->base = start - startingOffset;
- hc4->end = start;
- hc4->dictBase = start - startingOffset;
- hc4->dictLimit = (U32) startingOffset;
- hc4->lowLimit = (U32) startingOffset;
-}
-
-
-/* Update chains up to ip (excluded) */
-LZ4_FORCE_INLINE void LZ4HC_Insert (LZ4HC_CCtx_internal* hc4, const BYTE* ip)
-{
- U16* const chainTable = hc4->chainTable;
- U32* const hashTable = hc4->hashTable;
- const BYTE* const base = hc4->base;
- U32 const target = (U32)(ip - base);
- U32 idx = hc4->nextToUpdate;
-
- while (idx < target) {
- U32 const h = LZ4HC_hashPtr(base+idx);
- size_t delta = idx - hashTable[h];
- if (delta>LZ4_DISTANCE_MAX) delta = LZ4_DISTANCE_MAX;
- DELTANEXTU16(chainTable, idx) = (U16)delta;
- hashTable[h] = idx;
- idx++;
- }
-
- hc4->nextToUpdate = target;
-}
-
-/** LZ4HC_countBack() :
- * @return : negative value, nb of common bytes before ip/match */
-LZ4_FORCE_INLINE
-int LZ4HC_countBack(const BYTE* const ip, const BYTE* const match,
- const BYTE* const iMin, const BYTE* const mMin)
-{
- int back = 0;
- int const min = (int)MAX(iMin - ip, mMin - match);
- assert(min <= 0);
- assert(ip >= iMin); assert((size_t)(ip-iMin) < (1U<<31));
- assert(match >= mMin); assert((size_t)(match - mMin) < (1U<<31));
- while ( (back > min)
- && (ip[back-1] == match[back-1]) )
- back--;
- return back;
-}
-
-#if defined(_MSC_VER)
-# define LZ4HC_rotl32(x,r) _rotl(x,r)
-#else
-# define LZ4HC_rotl32(x,r) ((x << r) | (x >> (32 - r)))
-#endif
-
-
-static U32 LZ4HC_rotatePattern(size_t const rotate, U32 const pattern)
-{
- size_t const bitsToRotate = (rotate & (sizeof(pattern) - 1)) << 3;
- if (bitsToRotate == 0)
- return pattern;
- return LZ4HC_rotl32(pattern, (int)bitsToRotate);
-}
-
-/* LZ4HC_countPattern() :
- * pattern32 must be a sample of repetitive pattern of length 1, 2 or 4 (but not 3!) */
-static unsigned
-LZ4HC_countPattern(const BYTE* ip, const BYTE* const iEnd, U32 const pattern32)
-{
- const BYTE* const iStart = ip;
- reg_t const pattern = (sizeof(pattern)==8) ? (reg_t)pattern32 + (((reg_t)pattern32) << 32) : pattern32;
-
- while (likely(ip < iEnd-(sizeof(pattern)-1))) {
- reg_t const diff = LZ4_read_ARCH(ip) ^ pattern;
- if (!diff) { ip+=sizeof(pattern); continue; }
- ip += LZ4_NbCommonBytes(diff);
- return (unsigned)(ip - iStart);
- }
-
- if (LZ4_isLittleEndian()) {
- reg_t patternByte = pattern;
- while ((ip<iEnd) && (*ip == (BYTE)patternByte)) {
- ip++; patternByte >>= 8;
- }
- } else { /* big endian */
- U32 bitOffset = (sizeof(pattern)*8) - 8;
- while (ip < iEnd) {
- BYTE const byte = (BYTE)(pattern >> bitOffset);
- if (*ip != byte) break;
- ip ++; bitOffset -= 8;
- }
- }
-
- return (unsigned)(ip - iStart);
-}
-
-/* LZ4HC_reverseCountPattern() :
- * pattern must be a sample of repetitive pattern of length 1, 2 or 4 (but not 3!)
- * read using natural platform endianess */
-static unsigned
-LZ4HC_reverseCountPattern(const BYTE* ip, const BYTE* const iLow, U32 pattern)
-{
- const BYTE* const iStart = ip;
-
- while (likely(ip >= iLow+4)) {
- if (LZ4_read32(ip-4) != pattern) break;
- ip -= 4;
- }
- { const BYTE* bytePtr = (const BYTE*)(&pattern) + 3; /* works for any endianess */
- while (likely(ip>iLow)) {
- if (ip[-1] != *bytePtr) break;
- ip--; bytePtr--;
- } }
- return (unsigned)(iStart - ip);
-}
-
-/* LZ4HC_protectDictEnd() :
- * Checks if the match is in the last 3 bytes of the dictionary, so reading the
- * 4 byte MINMATCH would overflow.
- * @returns true if the match index is okay.
- */
-static int LZ4HC_protectDictEnd(U32 const dictLimit, U32 const matchIndex)
-{
- return ((U32)((dictLimit - 1) - matchIndex) >= 3);
-}
-
-typedef enum { rep_untested, rep_not, rep_confirmed } repeat_state_e;
-typedef enum { favorCompressionRatio=0, favorDecompressionSpeed } HCfavor_e;
-
-LZ4_FORCE_INLINE int
-LZ4HC_InsertAndGetWiderMatch (
- LZ4HC_CCtx_internal* hc4,
- const BYTE* const ip,
- const BYTE* const iLowLimit,
- const BYTE* const iHighLimit,
- int longest,
- const BYTE** matchpos,
- const BYTE** startpos,
- const int maxNbAttempts,
- const int patternAnalysis,
- const int chainSwap,
- const dictCtx_directive dict,
- const HCfavor_e favorDecSpeed)
-{
- U16* const chainTable = hc4->chainTable;
- U32* const HashTable = hc4->hashTable;
- const LZ4HC_CCtx_internal * const dictCtx = hc4->dictCtx;
- const BYTE* const base = hc4->base;
- const U32 dictLimit = hc4->dictLimit;
- const BYTE* const lowPrefixPtr = base + dictLimit;
- const U32 ipIndex = (U32)(ip - base);
- const U32 lowestMatchIndex = (hc4->lowLimit + (LZ4_DISTANCE_MAX + 1) > ipIndex) ? hc4->lowLimit : ipIndex - LZ4_DISTANCE_MAX;
- const BYTE* const dictBase = hc4->dictBase;
- int const lookBackLength = (int)(ip-iLowLimit);
- int nbAttempts = maxNbAttempts;
- U32 matchChainPos = 0;
- U32 const pattern = LZ4_read32(ip);
- U32 matchIndex;
- repeat_state_e repeat = rep_untested;
- size_t srcPatternLength = 0;
-
- DEBUGLOG(7, "LZ4HC_InsertAndGetWiderMatch");
- /* First Match */
- LZ4HC_Insert(hc4, ip);
- matchIndex = HashTable[LZ4HC_hashPtr(ip)];
- DEBUGLOG(7, "First match at index %u / %u (lowestMatchIndex)",
- matchIndex, lowestMatchIndex);
-
- while ((matchIndex>=lowestMatchIndex) && (nbAttempts)) {
- int matchLength=0;
- nbAttempts--;
- assert(matchIndex < ipIndex);
- if (favorDecSpeed && (ipIndex - matchIndex < 8)) {
- /* do nothing */
- } else if (matchIndex >= dictLimit) { /* within current Prefix */
- const BYTE* const matchPtr = base + matchIndex;
- assert(matchPtr >= lowPrefixPtr);
- assert(matchPtr < ip);
- assert(longest >= 1);
- if (LZ4_read16(iLowLimit + longest - 1) == LZ4_read16(matchPtr - lookBackLength + longest - 1)) {
- if (LZ4_read32(matchPtr) == pattern) {
- int const back = lookBackLength ? LZ4HC_countBack(ip, matchPtr, iLowLimit, lowPrefixPtr) : 0;
- matchLength = MINMATCH + (int)LZ4_count(ip+MINMATCH, matchPtr+MINMATCH, iHighLimit);
- matchLength -= back;
- if (matchLength > longest) {
- longest = matchLength;
- *matchpos = matchPtr + back;
- *startpos = ip + back;
- } } }
- } else { /* lowestMatchIndex <= matchIndex < dictLimit */
- const BYTE* const matchPtr = dictBase + matchIndex;
- if (LZ4_read32(matchPtr) == pattern) {
- const BYTE* const dictStart = dictBase + hc4->lowLimit;
- int back = 0;
- const BYTE* vLimit = ip + (dictLimit - matchIndex);
- if (vLimit > iHighLimit) vLimit = iHighLimit;
- matchLength = (int)LZ4_count(ip+MINMATCH, matchPtr+MINMATCH, vLimit) + MINMATCH;
- if ((ip+matchLength == vLimit) && (vLimit < iHighLimit))
- matchLength += LZ4_count(ip+matchLength, lowPrefixPtr, iHighLimit);
- back = lookBackLength ? LZ4HC_countBack(ip, matchPtr, iLowLimit, dictStart) : 0;
- matchLength -= back;
- if (matchLength > longest) {
- longest = matchLength;
- *matchpos = base + matchIndex + back; /* virtual pos, relative to ip, to retrieve offset */
- *startpos = ip + back;
- } } }
-
- if (chainSwap && matchLength==longest) { /* better match => select a better chain */
- assert(lookBackLength==0); /* search forward only */
- if (matchIndex + (U32)longest <= ipIndex) {
- int const kTrigger = 4;
- U32 distanceToNextMatch = 1;
- int const end = longest - MINMATCH + 1;
- int step = 1;
- int accel = 1 << kTrigger;
- int pos;
- for (pos = 0; pos < end; pos += step) {
- U32 const candidateDist = DELTANEXTU16(chainTable, matchIndex + (U32)pos);
- step = (accel++ >> kTrigger);
- if (candidateDist > distanceToNextMatch) {
- distanceToNextMatch = candidateDist;
- matchChainPos = (U32)pos;
- accel = 1 << kTrigger;
- }
- }
- if (distanceToNextMatch > 1) {
- if (distanceToNextMatch > matchIndex) break; /* avoid overflow */
- matchIndex -= distanceToNextMatch;
- continue;
- } } }
-
- { U32 const distNextMatch = DELTANEXTU16(chainTable, matchIndex);
- if (patternAnalysis && distNextMatch==1 && matchChainPos==0) {
- U32 const matchCandidateIdx = matchIndex-1;
- /* may be a repeated pattern */
- if (repeat == rep_untested) {
- if ( ((pattern & 0xFFFF) == (pattern >> 16))
- & ((pattern & 0xFF) == (pattern >> 24)) ) {
- repeat = rep_confirmed;
- srcPatternLength = LZ4HC_countPattern(ip+sizeof(pattern), iHighLimit, pattern) + sizeof(pattern);
- } else {
- repeat = rep_not;
- } }
- if ( (repeat == rep_confirmed) && (matchCandidateIdx >= lowestMatchIndex)
- && LZ4HC_protectDictEnd(dictLimit, matchCandidateIdx) ) {
- const int extDict = matchCandidateIdx < dictLimit;
- const BYTE* const matchPtr = (extDict ? dictBase : base) + matchCandidateIdx;
- if (LZ4_read32(matchPtr) == pattern) { /* good candidate */
- const BYTE* const dictStart = dictBase + hc4->lowLimit;
- const BYTE* const iLimit = extDict ? dictBase + dictLimit : iHighLimit;
- size_t forwardPatternLength = LZ4HC_countPattern(matchPtr+sizeof(pattern), iLimit, pattern) + sizeof(pattern);
- if (extDict && matchPtr + forwardPatternLength == iLimit) {
- U32 const rotatedPattern = LZ4HC_rotatePattern(forwardPatternLength, pattern);
- forwardPatternLength += LZ4HC_countPattern(lowPrefixPtr, iHighLimit, rotatedPattern);
- }
- { const BYTE* const lowestMatchPtr = extDict ? dictStart : lowPrefixPtr;
- size_t backLength = LZ4HC_reverseCountPattern(matchPtr, lowestMatchPtr, pattern);
- size_t currentSegmentLength;
- if (!extDict && matchPtr - backLength == lowPrefixPtr && hc4->lowLimit < dictLimit) {
- U32 const rotatedPattern = LZ4HC_rotatePattern((U32)(-(int)backLength), pattern);
- backLength += LZ4HC_reverseCountPattern(dictBase + dictLimit, dictStart, rotatedPattern);
- }
- /* Limit backLength not go further than lowestMatchIndex */
- backLength = matchCandidateIdx - MAX(matchCandidateIdx - (U32)backLength, lowestMatchIndex);
- assert(matchCandidateIdx - backLength >= lowestMatchIndex);
- currentSegmentLength = backLength + forwardPatternLength;
- /* Adjust to end of pattern if the source pattern fits, otherwise the beginning of the pattern */
- if ( (currentSegmentLength >= srcPatternLength) /* current pattern segment large enough to contain full srcPatternLength */
- && (forwardPatternLength <= srcPatternLength) ) { /* haven't reached this position yet */
- U32 const newMatchIndex = matchCandidateIdx + (U32)forwardPatternLength - (U32)srcPatternLength; /* best position, full pattern, might be followed by more match */
- if (LZ4HC_protectDictEnd(dictLimit, newMatchIndex))
- matchIndex = newMatchIndex;
- else {
- /* Can only happen if started in the prefix */
- assert(newMatchIndex >= dictLimit - 3 && newMatchIndex < dictLimit && !extDict);
- matchIndex = dictLimit;
- }
- } else {
- U32 const newMatchIndex = matchCandidateIdx - (U32)backLength; /* farthest position in current segment, will find a match of length currentSegmentLength + maybe some back */
- if (!LZ4HC_protectDictEnd(dictLimit, newMatchIndex)) {
- assert(newMatchIndex >= dictLimit - 3 && newMatchIndex < dictLimit && !extDict);
- matchIndex = dictLimit;
- } else {
- matchIndex = newMatchIndex;
- if (lookBackLength==0) { /* no back possible */
- size_t const maxML = MIN(currentSegmentLength, srcPatternLength);
- if ((size_t)longest < maxML) {
- assert(base + matchIndex < ip);
- if (ip - (base+matchIndex) > LZ4_DISTANCE_MAX) break;
- assert(maxML < 2 GB);
- longest = (int)maxML;
- *matchpos = base + matchIndex; /* virtual pos, relative to ip, to retrieve offset */
- *startpos = ip;
- }
- { U32 const distToNextPattern = DELTANEXTU16(chainTable, matchIndex);
- if (distToNextPattern > matchIndex) break; /* avoid overflow */
- matchIndex -= distToNextPattern;
- } } } } }
- continue;
- } }
- } } /* PA optimization */
-
- /* follow current chain */
- matchIndex -= DELTANEXTU16(chainTable, matchIndex + matchChainPos);
-
- } /* while ((matchIndex>=lowestMatchIndex) && (nbAttempts)) */
-
- if ( dict == usingDictCtxHc
- && nbAttempts
- && ipIndex - lowestMatchIndex < LZ4_DISTANCE_MAX) {
- size_t const dictEndOffset = (size_t)(dictCtx->end - dictCtx->base);
- U32 dictMatchIndex = dictCtx->hashTable[LZ4HC_hashPtr(ip)];
- assert(dictEndOffset <= 1 GB);
- matchIndex = dictMatchIndex + lowestMatchIndex - (U32)dictEndOffset;
- while (ipIndex - matchIndex <= LZ4_DISTANCE_MAX && nbAttempts--) {
- const BYTE* const matchPtr = dictCtx->base + dictMatchIndex;
-
- if (LZ4_read32(matchPtr) == pattern) {
- int mlt;
- int back = 0;
- const BYTE* vLimit = ip + (dictEndOffset - dictMatchIndex);
- if (vLimit > iHighLimit) vLimit = iHighLimit;
- mlt = (int)LZ4_count(ip+MINMATCH, matchPtr+MINMATCH, vLimit) + MINMATCH;
- back = lookBackLength ? LZ4HC_countBack(ip, matchPtr, iLowLimit, dictCtx->base + dictCtx->dictLimit) : 0;
- mlt -= back;
- if (mlt > longest) {
- longest = mlt;
- *matchpos = base + matchIndex + back;
- *startpos = ip + back;
- } }
-
- { U32 const nextOffset = DELTANEXTU16(dictCtx->chainTable, dictMatchIndex);
- dictMatchIndex -= nextOffset;
- matchIndex -= nextOffset;
- } } }
-
- return longest;
-}
-
-LZ4_FORCE_INLINE
-int LZ4HC_InsertAndFindBestMatch(LZ4HC_CCtx_internal* const hc4, /* Index table will be updated */
- const BYTE* const ip, const BYTE* const iLimit,
- const BYTE** matchpos,
- const int maxNbAttempts,
- const int patternAnalysis,
- const dictCtx_directive dict)
-{
- const BYTE* uselessPtr = ip;
- /* note : LZ4HC_InsertAndGetWiderMatch() is able to modify the starting position of a match (*startpos),
- * but this won't be the case here, as we define iLowLimit==ip,
- * so LZ4HC_InsertAndGetWiderMatch() won't be allowed to search past ip */
- return LZ4HC_InsertAndGetWiderMatch(hc4, ip, ip, iLimit, MINMATCH-1, matchpos, &uselessPtr, maxNbAttempts, patternAnalysis, 0 /*chainSwap*/, dict, favorCompressionRatio);
-}
-
-/* LZ4HC_encodeSequence() :
- * @return : 0 if ok,
- * 1 if buffer issue detected */
-LZ4_FORCE_INLINE int LZ4HC_encodeSequence (
- const BYTE** ip,
- BYTE** op,
- const BYTE** anchor,
- int matchLength,
- const BYTE* const match,
- limitedOutput_directive limit,
- BYTE* oend)
-{
- size_t length;
- BYTE* const token = (*op)++;
-
-#if defined(LZ4_DEBUG) && (LZ4_DEBUG >= 6)
- static const BYTE* start = NULL;
- static U32 totalCost = 0;
- U32 const pos = (start==NULL) ? 0 : (U32)(*anchor - start);
- U32 const ll = (U32)(*ip - *anchor);
- U32 const llAdd = (ll>=15) ? ((ll-15) / 255) + 1 : 0;
- U32 const mlAdd = (matchLength>=19) ? ((matchLength-19) / 255) + 1 : 0;
- U32 const cost = 1 + llAdd + ll + 2 + mlAdd;
- if (start==NULL) start = *anchor; /* only works for single segment */
- /* g_debuglog_enable = (pos >= 2228) & (pos <= 2262); */
- DEBUGLOG(6, "pos:%7u -- literals:%3u, match:%4i, offset:%5u, cost:%3u + %u",
- pos,
- (U32)(*ip - *anchor), matchLength, (U32)(*ip-match),
- cost, totalCost);
- totalCost += cost;
-#endif
-
- /* Encode Literal length */
- length = (size_t)(*ip - *anchor);
- if ((limit) && ((*op + (length / 255) + length + (2 + 1 + LASTLITERALS)) > oend)) return 1; /* Check output limit */
- if (length >= RUN_MASK) {
- size_t len = length - RUN_MASK;
- *token = (RUN_MASK << ML_BITS);
- for(; len >= 255 ; len -= 255) *(*op)++ = 255;
- *(*op)++ = (BYTE)len;
- } else {
- *token = (BYTE)(length << ML_BITS);
- }
-
- /* Copy Literals */
- LZ4_wildCopy8(*op, *anchor, (*op) + length);
- *op += length;
-
- /* Encode Offset */
- assert( (*ip - match) <= LZ4_DISTANCE_MAX ); /* note : consider providing offset as a value, rather than as a pointer difference */
- LZ4_writeLE16(*op, (U16)(*ip-match)); *op += 2;
-
- /* Encode MatchLength */
- assert(matchLength >= MINMATCH);
- length = (size_t)matchLength - MINMATCH;
- if ((limit) && (*op + (length / 255) + (1 + LASTLITERALS) > oend)) return 1; /* Check output limit */
- if (length >= ML_MASK) {
- *token += ML_MASK;
- length -= ML_MASK;
- for(; length >= 510 ; length -= 510) { *(*op)++ = 255; *(*op)++ = 255; }
- if (length >= 255) { length -= 255; *(*op)++ = 255; }
- *(*op)++ = (BYTE)length;
- } else {
- *token += (BYTE)(length);
- }
-
- /* Prepare next loop */
- *ip += matchLength;
- *anchor = *ip;
-
- return 0;
-}
-
-LZ4_FORCE_INLINE int LZ4HC_compress_hashChain (
- LZ4HC_CCtx_internal* const ctx,
- const char* const source,
- char* const dest,
- int* srcSizePtr,
- int const maxOutputSize,
- unsigned maxNbAttempts,
- const limitedOutput_directive limit,
- const dictCtx_directive dict
- )
-{
- const int inputSize = *srcSizePtr;
- const int patternAnalysis = (maxNbAttempts > 128); /* levels 9+ */
-
- const BYTE* ip = (const BYTE*) source;
- const BYTE* anchor = ip;
- const BYTE* const iend = ip + inputSize;
- const BYTE* const mflimit = iend - MFLIMIT;
- const BYTE* const matchlimit = (iend - LASTLITERALS);
-
- BYTE* optr = (BYTE*) dest;
- BYTE* op = (BYTE*) dest;
- BYTE* oend = op + maxOutputSize;
-
- int ml0, ml, ml2, ml3;
- const BYTE* start0;
- const BYTE* ref0;
- const BYTE* ref = NULL;
- const BYTE* start2 = NULL;
- const BYTE* ref2 = NULL;
- const BYTE* start3 = NULL;
- const BYTE* ref3 = NULL;
-
- /* init */
- *srcSizePtr = 0;
- if (limit == fillOutput) oend -= LASTLITERALS; /* Hack for support LZ4 format restriction */
- if (inputSize < LZ4_minLength) goto _last_literals; /* Input too small, no compression (all literals) */
-
- /* Main Loop */
- while (ip <= mflimit) {
- ml = LZ4HC_InsertAndFindBestMatch(ctx, ip, matchlimit, &ref, maxNbAttempts, patternAnalysis, dict);
- if (ml<MINMATCH) { ip++; continue; }
-
- /* saved, in case we would skip too much */
- start0 = ip; ref0 = ref; ml0 = ml;
-
-_Search2:
- if (ip+ml <= mflimit) {
- ml2 = LZ4HC_InsertAndGetWiderMatch(ctx,
- ip + ml - 2, ip + 0, matchlimit, ml, &ref2, &start2,
- maxNbAttempts, patternAnalysis, 0, dict, favorCompressionRatio);
- } else {
- ml2 = ml;
- }
-
- if (ml2 == ml) { /* No better match => encode ML1 */
- optr = op;
- if (LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), ml, ref, limit, oend)) goto _dest_overflow;
- continue;
- }
-
- if (start0 < ip) { /* first match was skipped at least once */
- if (start2 < ip + ml0) { /* squeezing ML1 between ML0(original ML1) and ML2 */
- ip = start0; ref = ref0; ml = ml0; /* restore initial ML1 */
- } }
-
- /* Here, start0==ip */
- if ((start2 - ip) < 3) { /* First Match too small : removed */
- ml = ml2;
- ip = start2;
- ref =ref2;
- goto _Search2;
- }
-
-_Search3:
- /* At this stage, we have :
- * ml2 > ml1, and
- * ip1+3 <= ip2 (usually < ip1+ml1) */
- if ((start2 - ip) < OPTIMAL_ML) {
- int correction;
- int new_ml = ml;
- if (new_ml > OPTIMAL_ML) new_ml = OPTIMAL_ML;
- if (ip+new_ml > start2 + ml2 - MINMATCH) new_ml = (int)(start2 - ip) + ml2 - MINMATCH;
- correction = new_ml - (int)(start2 - ip);
- if (correction > 0) {
- start2 += correction;
- ref2 += correction;
- ml2 -= correction;
- }
- }
- /* Now, we have start2 = ip+new_ml, with new_ml = min(ml, OPTIMAL_ML=18) */
-
- if (start2 + ml2 <= mflimit) {
- ml3 = LZ4HC_InsertAndGetWiderMatch(ctx,
- start2 + ml2 - 3, start2, matchlimit, ml2, &ref3, &start3,
- maxNbAttempts, patternAnalysis, 0, dict, favorCompressionRatio);
- } else {
- ml3 = ml2;
- }
-
- if (ml3 == ml2) { /* No better match => encode ML1 and ML2 */
- /* ip & ref are known; Now for ml */
- if (start2 < ip+ml) ml = (int)(start2 - ip);
- /* Now, encode 2 sequences */
- optr = op;
- if (LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), ml, ref, limit, oend)) goto _dest_overflow;
- ip = start2;
- optr = op;
- if (LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), ml2, ref2, limit, oend)) goto _dest_overflow;
- continue;
- }
-
- if (start3 < ip+ml+3) { /* Not enough space for match 2 : remove it */
- if (start3 >= (ip+ml)) { /* can write Seq1 immediately ==> Seq2 is removed, so Seq3 becomes Seq1 */
- if (start2 < ip+ml) {
- int correction = (int)(ip+ml - start2);
- start2 += correction;
- ref2 += correction;
- ml2 -= correction;
- if (ml2 < MINMATCH) {
- start2 = start3;
- ref2 = ref3;
- ml2 = ml3;
- }
- }
-
- optr = op;
- if (LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), ml, ref, limit, oend)) goto _dest_overflow;
- ip = start3;
- ref = ref3;
- ml = ml3;
-
- start0 = start2;
- ref0 = ref2;
- ml0 = ml2;
- goto _Search2;
- }
-
- start2 = start3;
- ref2 = ref3;
- ml2 = ml3;
- goto _Search3;
- }
-
- /*
- * OK, now we have 3 ascending matches;
- * let's write the first one ML1.
- * ip & ref are known; Now decide ml.
- */
- if (start2 < ip+ml) {
- if ((start2 - ip) < OPTIMAL_ML) {
- int correction;
- if (ml > OPTIMAL_ML) ml = OPTIMAL_ML;
- if (ip + ml > start2 + ml2 - MINMATCH) ml = (int)(start2 - ip) + ml2 - MINMATCH;
- correction = ml - (int)(start2 - ip);
- if (correction > 0) {
- start2 += correction;
- ref2 += correction;
- ml2 -= correction;
- }
- } else {
- ml = (int)(start2 - ip);
- }
- }
- optr = op;
- if (LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), ml, ref, limit, oend)) goto _dest_overflow;
-
- /* ML2 becomes ML1 */
- ip = start2; ref = ref2; ml = ml2;
-
- /* ML3 becomes ML2 */
- start2 = start3; ref2 = ref3; ml2 = ml3;
-
- /* let's find a new ML3 */
- goto _Search3;
- }
-
-_last_literals:
- /* Encode Last Literals */
- { size_t lastRunSize = (size_t)(iend - anchor); /* literals */
- size_t litLength = (lastRunSize + 255 - RUN_MASK) / 255;
- size_t const totalSize = 1 + litLength + lastRunSize;
- if (limit == fillOutput) oend += LASTLITERALS; /* restore correct value */
- if (limit && (op + totalSize > oend)) {
- if (limit == limitedOutput) return 0; /* Check output limit */
- /* adapt lastRunSize to fill 'dest' */
- lastRunSize = (size_t)(oend - op) - 1;
- litLength = (lastRunSize + 255 - RUN_MASK) / 255;
- lastRunSize -= litLength;
- }
- ip = anchor + lastRunSize;
-
- if (lastRunSize >= RUN_MASK) {
- size_t accumulator = lastRunSize - RUN_MASK;
- *op++ = (RUN_MASK << ML_BITS);
- for(; accumulator >= 255 ; accumulator -= 255) *op++ = 255;
- *op++ = (BYTE) accumulator;
- } else {
- *op++ = (BYTE)(lastRunSize << ML_BITS);
- }
- memcpy(op, anchor, lastRunSize);
- op += lastRunSize;
- }
-
- /* End */
- *srcSizePtr = (int) (((const char*)ip) - source);
- return (int) (((char*)op)-dest);
-
-_dest_overflow:
- if (limit == fillOutput) {
- op = optr; /* restore correct out pointer */
- goto _last_literals;
- }
- return 0;
-}
-
-
-static int LZ4HC_compress_optimal( LZ4HC_CCtx_internal* ctx,
- const char* const source, char* dst,
- int* srcSizePtr, int dstCapacity,
- int const nbSearches, size_t sufficient_len,
- const limitedOutput_directive limit, int const fullUpdate,
- const dictCtx_directive dict,
- HCfavor_e favorDecSpeed);
-
-
-LZ4_FORCE_INLINE int LZ4HC_compress_generic_internal (
- LZ4HC_CCtx_internal* const ctx,
- const char* const src,
- char* const dst,
- int* const srcSizePtr,
- int const dstCapacity,
- int cLevel,
- const limitedOutput_directive limit,
- const dictCtx_directive dict
- )
-{
- typedef enum { lz4hc, lz4opt } lz4hc_strat_e;
- typedef struct {
- lz4hc_strat_e strat;
- U32 nbSearches;
- U32 targetLength;
- } cParams_t;
- static const cParams_t clTable[LZ4HC_CLEVEL_MAX+1] = {
- { lz4hc, 2, 16 }, /* 0, unused */
- { lz4hc, 2, 16 }, /* 1, unused */
- { lz4hc, 2, 16 }, /* 2, unused */
- { lz4hc, 4, 16 }, /* 3 */
- { lz4hc, 8, 16 }, /* 4 */
- { lz4hc, 16, 16 }, /* 5 */
- { lz4hc, 32, 16 }, /* 6 */
- { lz4hc, 64, 16 }, /* 7 */
- { lz4hc, 128, 16 }, /* 8 */
- { lz4hc, 256, 16 }, /* 9 */
- { lz4opt, 96, 64 }, /*10==LZ4HC_CLEVEL_OPT_MIN*/
- { lz4opt, 512,128 }, /*11 */
- { lz4opt,16384,LZ4_OPT_NUM }, /* 12==LZ4HC_CLEVEL_MAX */
- };
-
- DEBUGLOG(4, "LZ4HC_compress_generic(ctx=%p, src=%p, srcSize=%d)", ctx, src, *srcSizePtr);
-
- if (limit == fillOutput && dstCapacity < 1) return 0; /* Impossible to store anything */
- if ((U32)*srcSizePtr > (U32)LZ4_MAX_INPUT_SIZE) return 0; /* Unsupported input size (too large or negative) */
-
- ctx->end += *srcSizePtr;
- if (cLevel < 1) cLevel = LZ4HC_CLEVEL_DEFAULT; /* note : convention is different from lz4frame, maybe something to review */
- cLevel = MIN(LZ4HC_CLEVEL_MAX, cLevel);
- { cParams_t const cParam = clTable[cLevel];
- HCfavor_e const favor = ctx->favorDecSpeed ? favorDecompressionSpeed : favorCompressionRatio;
- int result;
-
- if (cParam.strat == lz4hc) {
- result = LZ4HC_compress_hashChain(ctx,
- src, dst, srcSizePtr, dstCapacity,
- cParam.nbSearches, limit, dict);
- } else {
- assert(cParam.strat == lz4opt);
- result = LZ4HC_compress_optimal(ctx,
- src, dst, srcSizePtr, dstCapacity,
- (int)cParam.nbSearches, cParam.targetLength, limit,
- cLevel == LZ4HC_CLEVEL_MAX, /* ultra mode */
- dict, favor);
- }
- if (result <= 0) ctx->dirty = 1;
- return result;
- }
-}
-
-static void LZ4HC_setExternalDict(LZ4HC_CCtx_internal* ctxPtr, const BYTE* newBlock);
-
-static int
-LZ4HC_compress_generic_noDictCtx (
- LZ4HC_CCtx_internal* const ctx,
- const char* const src,
- char* const dst,
- int* const srcSizePtr,
- int const dstCapacity,
- int cLevel,
- limitedOutput_directive limit
- )
-{
- assert(ctx->dictCtx == NULL);
- return LZ4HC_compress_generic_internal(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit, noDictCtx);
-}
-
-static int
-LZ4HC_compress_generic_dictCtx (
- LZ4HC_CCtx_internal* const ctx,
- const char* const src,
- char* const dst,
- int* const srcSizePtr,
- int const dstCapacity,
- int cLevel,
- limitedOutput_directive limit
- )
-{
- const size_t position = (size_t)(ctx->end - ctx->base) - ctx->lowLimit;
- assert(ctx->dictCtx != NULL);
- if (position >= 64 KB) {
- ctx->dictCtx = NULL;
- return LZ4HC_compress_generic_noDictCtx(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit);
- } else if (position == 0 && *srcSizePtr > 4 KB) {
- memcpy(ctx, ctx->dictCtx, sizeof(LZ4HC_CCtx_internal));
- LZ4HC_setExternalDict(ctx, (const BYTE *)src);
- ctx->compressionLevel = (short)cLevel;
- return LZ4HC_compress_generic_noDictCtx(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit);
- } else {
- return LZ4HC_compress_generic_internal(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit, usingDictCtxHc);
- }
-}
-
-static int
-LZ4HC_compress_generic (
- LZ4HC_CCtx_internal* const ctx,
- const char* const src,
- char* const dst,
- int* const srcSizePtr,
- int const dstCapacity,
- int cLevel,
- limitedOutput_directive limit
- )
-{
- if (ctx->dictCtx == NULL) {
- return LZ4HC_compress_generic_noDictCtx(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit);
- } else {
- return LZ4HC_compress_generic_dictCtx(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit);
- }
-}
-
-
-int LZ4_sizeofStateHC(void) { return (int)sizeof(LZ4_streamHC_t); }
-
-#ifndef _MSC_VER /* for some reason, Visual fails the aligment test on 32-bit x86 :
- * it reports an aligment of 8-bytes,
- * while actually aligning LZ4_streamHC_t on 4 bytes. */
-static size_t LZ4_streamHC_t_alignment(void)
-{
- struct { char c; LZ4_streamHC_t t; } t_a;
- return sizeof(t_a) - sizeof(t_a.t);
-}
-#endif
-
-/* state is presumed correctly initialized,
- * in which case its size and alignment have already been validate */
-static int LZ4_compress_HC_extStateHC_fastReset (void* state, const char* src, char* dst, int srcSize,
- int dstCapacity, int compressionLevel)
-{
- LZ4HC_CCtx_internal* const ctx = &((LZ4_streamHC_t*)state)->internal_donotuse;
-#ifndef _MSC_VER /* for some reason, Visual fails the aligment test on 32-bit x86 :
- * it reports an aligment of 8-bytes,
- * while actually aligning LZ4_streamHC_t on 4 bytes. */
- assert(((size_t)state & (LZ4_streamHC_t_alignment() - 1)) == 0); /* check alignment */
-#endif
- if (((size_t)(state)&(sizeof(void*)-1)) != 0) return 0; /* Error : state is not aligned for pointers (32 or 64 bits) */
- LZ4_resetStreamHC_fast((LZ4_streamHC_t*)state, compressionLevel);
- LZ4HC_init_internal (ctx, (const BYTE*)src);
- if (dstCapacity < LZ4_compressBound(srcSize))
- return LZ4HC_compress_generic (ctx, src, dst, &srcSize, dstCapacity, compressionLevel, limitedOutput);
- else
- return LZ4HC_compress_generic (ctx, src, dst, &srcSize, dstCapacity, compressionLevel, notLimited);
-}
-
-int LZ4_compress_HC_extStateHC (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int compressionLevel)
-{
- LZ4_streamHC_t* const ctx = LZ4_initStreamHC(state, sizeof(*ctx));
- if (ctx==NULL) return 0; /* init failure */
- return LZ4_compress_HC_extStateHC_fastReset(state, src, dst, srcSize, dstCapacity, compressionLevel);
-}
-
-int LZ4_compress_HC(const char* src, char* dst, int srcSize, int dstCapacity, int compressionLevel)
-{
-#if defined(LZ4HC_HEAPMODE) && LZ4HC_HEAPMODE==1
- LZ4_streamHC_t* const statePtr = (LZ4_streamHC_t*)ALLOC(sizeof(LZ4_streamHC_t));
-#else
- LZ4_streamHC_t state;
- LZ4_streamHC_t* const statePtr = &state;
-#endif
- int const cSize = LZ4_compress_HC_extStateHC(statePtr, src, dst, srcSize, dstCapacity, compressionLevel);
-#if defined(LZ4HC_HEAPMODE) && LZ4HC_HEAPMODE==1
- FREEMEM(statePtr);
-#endif
- return cSize;
-}
-
-/* state is presumed sized correctly (>= sizeof(LZ4_streamHC_t)) */
-int LZ4_compress_HC_destSize(void* state, const char* source, char* dest, int* sourceSizePtr, int targetDestSize, int cLevel)
-{
- LZ4_streamHC_t* const ctx = LZ4_initStreamHC(state, sizeof(*ctx));
- if (ctx==NULL) return 0; /* init failure */
- LZ4HC_init_internal(&ctx->internal_donotuse, (const BYTE*) source);
- LZ4_setCompressionLevel(ctx, cLevel);
- return LZ4HC_compress_generic(&ctx->internal_donotuse, source, dest, sourceSizePtr, targetDestSize, cLevel, fillOutput);
-}
-
-
-
-/**************************************
-* Streaming Functions
-**************************************/
-
-LZ4_streamHC_t* LZ4_initStreamHC (void* buffer, size_t size)
-{
- LZ4_streamHC_t* const LZ4_streamHCPtr = (LZ4_streamHC_t*)buffer;
- if (buffer == NULL) return NULL;
- if (size < sizeof(LZ4_streamHC_t)) return NULL;
-#ifndef _MSC_VER /* for some reason, Visual fails the aligment test on 32-bit x86 :
- * it reports an aligment of 8-bytes,
- * while actually aligning LZ4_streamHC_t on 4 bytes. */
- if (((size_t)buffer) & (LZ4_streamHC_t_alignment() - 1)) return NULL; /* alignment check */
-#endif
- /* if compilation fails here, LZ4_STREAMHCSIZE must be increased */
- LZ4_STATIC_ASSERT(sizeof(LZ4HC_CCtx_internal) <= LZ4_STREAMHCSIZE);
- DEBUGLOG(4, "LZ4_initStreamHC(%p, %u)", LZ4_streamHCPtr, (unsigned)size);
- /* end-base will trigger a clearTable on starting compression */
- LZ4_streamHCPtr->internal_donotuse.end = (const BYTE *)(ptrdiff_t)-1;
- LZ4_streamHCPtr->internal_donotuse.base = NULL;
- LZ4_streamHCPtr->internal_donotuse.dictCtx = NULL;
- LZ4_streamHCPtr->internal_donotuse.favorDecSpeed = 0;
- LZ4_streamHCPtr->internal_donotuse.dirty = 0;
- LZ4_setCompressionLevel(LZ4_streamHCPtr, LZ4HC_CLEVEL_DEFAULT);
- return LZ4_streamHCPtr;
-}
-
-/* just a stub */
-void LZ4_resetStreamHC_fast (LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel)
-{
- DEBUGLOG(4, "LZ4_resetStreamHC_fast(%p, %d)", LZ4_streamHCPtr, compressionLevel);
- if (LZ4_streamHCPtr->internal_donotuse.dirty) {
- LZ4_initStreamHC(LZ4_streamHCPtr, sizeof(*LZ4_streamHCPtr));
- } else {
- /* preserve end - base : can trigger clearTable's threshold */
- LZ4_streamHCPtr->internal_donotuse.end -= (uptrval)LZ4_streamHCPtr->internal_donotuse.base;
- LZ4_streamHCPtr->internal_donotuse.base = NULL;
- LZ4_streamHCPtr->internal_donotuse.dictCtx = NULL;
- }
- LZ4_setCompressionLevel(LZ4_streamHCPtr, compressionLevel);
-}
-
-void LZ4_setCompressionLevel(LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel)
-{
- DEBUGLOG(5, "LZ4_setCompressionLevel(%p, %d)", LZ4_streamHCPtr, compressionLevel);
- if (compressionLevel < 1) compressionLevel = LZ4HC_CLEVEL_DEFAULT;
- if (compressionLevel > LZ4HC_CLEVEL_MAX) compressionLevel = LZ4HC_CLEVEL_MAX;
- LZ4_streamHCPtr->internal_donotuse.compressionLevel = (short)compressionLevel;
-}
-
-/* compression */
-
-static void LZ4HC_setExternalDict(LZ4HC_CCtx_internal* ctxPtr, const BYTE* newBlock)
-{
- DEBUGLOG(4, "LZ4HC_setExternalDict(%p, %p)", ctxPtr, newBlock);
- if (ctxPtr->end >= ctxPtr->base + ctxPtr->dictLimit + 4)
- LZ4HC_Insert (ctxPtr, ctxPtr->end-3); /* Referencing remaining dictionary content */
-
- /* Only one memory segment for extDict, so any previous extDict is lost at this stage */
- ctxPtr->lowLimit = ctxPtr->dictLimit;
- ctxPtr->dictLimit = (U32)(ctxPtr->end - ctxPtr->base);
- ctxPtr->dictBase = ctxPtr->base;
- ctxPtr->base = newBlock - ctxPtr->dictLimit;
- ctxPtr->end = newBlock;
- ctxPtr->nextToUpdate = ctxPtr->dictLimit; /* match referencing will resume from there */
-
- /* cannot reference an extDict and a dictCtx at the same time */
- ctxPtr->dictCtx = NULL;
-}
-
-/* ================================================
- * LZ4 Optimal parser (levels [LZ4HC_CLEVEL_OPT_MIN - LZ4HC_CLEVEL_MAX])
- * ===============================================*/
-typedef struct {
- int price;
- int off;
- int mlen;
- int litlen;
-} LZ4HC_optimal_t;
-
-/* price in bytes */
-LZ4_FORCE_INLINE int LZ4HC_literalsPrice(int const litlen)
-{
- int price = litlen;
- assert(litlen >= 0);
- if (litlen >= (int)RUN_MASK)
- price += 1 + ((litlen-(int)RUN_MASK) / 255);
- return price;
-}
-
-
-/* requires mlen >= MINMATCH */
-LZ4_FORCE_INLINE int LZ4HC_sequencePrice(int litlen, int mlen)
-{
- int price = 1 + 2 ; /* token + 16-bit offset */
- assert(litlen >= 0);
- assert(mlen >= MINMATCH);
-
- price += LZ4HC_literalsPrice(litlen);
-
- if (mlen >= (int)(ML_MASK+MINMATCH))
- price += 1 + ((mlen-(int)(ML_MASK+MINMATCH)) / 255);
-
- return price;
-}
-
-
-typedef struct {
- int off;
- int len;
-} LZ4HC_match_t;
-
-LZ4_FORCE_INLINE LZ4HC_match_t
-LZ4HC_FindLongerMatch(LZ4HC_CCtx_internal* const ctx,
- const BYTE* ip, const BYTE* const iHighLimit,
- int minLen, int nbSearches,
- const dictCtx_directive dict,
- const HCfavor_e favorDecSpeed)
-{
- LZ4HC_match_t match = { 0 , 0 };
- const BYTE* matchPtr = NULL;
- /* note : LZ4HC_InsertAndGetWiderMatch() is able to modify the starting position of a match (*startpos),
- * but this won't be the case here, as we define iLowLimit==ip,
- * so LZ4HC_InsertAndGetWiderMatch() won't be allowed to search past ip */
- int matchLength = LZ4HC_InsertAndGetWiderMatch(ctx, ip, ip, iHighLimit, minLen, &matchPtr, &ip, nbSearches, 1 /*patternAnalysis*/, 1 /*chainSwap*/, dict, favorDecSpeed);
- if (matchLength <= minLen) return match;
- if (favorDecSpeed) {
- if ((matchLength>18) & (matchLength<=36)) matchLength=18; /* favor shortcut */
- }
- match.len = matchLength;
- match.off = (int)(ip-matchPtr);
- return match;
-}
-
-
-static int LZ4HC_compress_optimal ( LZ4HC_CCtx_internal* ctx,
- const char* const source,
- char* dst,
- int* srcSizePtr,
- int dstCapacity,
- int const nbSearches,
- size_t sufficient_len,
- const limitedOutput_directive limit,
- int const fullUpdate,
- const dictCtx_directive dict,
- const HCfavor_e favorDecSpeed)
-{
-#define TRAILING_LITERALS 3
- LZ4HC_optimal_t opt[LZ4_OPT_NUM + TRAILING_LITERALS]; /* ~64 KB, which is a bit large for stack... */
-
- const BYTE* ip = (const BYTE*) source;
- const BYTE* anchor = ip;
- const BYTE* const iend = ip + *srcSizePtr;
- const BYTE* const mflimit = iend - MFLIMIT;
- const BYTE* const matchlimit = iend - LASTLITERALS;
- BYTE* op = (BYTE*) dst;
- BYTE* opSaved = (BYTE*) dst;
- BYTE* oend = op + dstCapacity;
-
- /* init */
- DEBUGLOG(5, "LZ4HC_compress_optimal(dst=%p, dstCapa=%u)", dst, (unsigned)dstCapacity);
- *srcSizePtr = 0;
- if (limit == fillOutput) oend -= LASTLITERALS; /* Hack for support LZ4 format restriction */
- if (sufficient_len >= LZ4_OPT_NUM) sufficient_len = LZ4_OPT_NUM-1;
-
- /* Main Loop */
- assert(ip - anchor < LZ4_MAX_INPUT_SIZE);
- while (ip <= mflimit) {
- int const llen = (int)(ip - anchor);
- int best_mlen, best_off;
- int cur, last_match_pos = 0;
-
- LZ4HC_match_t const firstMatch = LZ4HC_FindLongerMatch(ctx, ip, matchlimit, MINMATCH-1, nbSearches, dict, favorDecSpeed);
- if (firstMatch.len==0) { ip++; continue; }
-
- if ((size_t)firstMatch.len > sufficient_len) {
- /* good enough solution : immediate encoding */
- int const firstML = firstMatch.len;
- const BYTE* const matchPos = ip - firstMatch.off;
- opSaved = op;
- if ( LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), firstML, matchPos, limit, oend) ) /* updates ip, op and anchor */
- goto _dest_overflow;
- continue;
- }
-
- /* set prices for first positions (literals) */
- { int rPos;
- for (rPos = 0 ; rPos < MINMATCH ; rPos++) {
- int const cost = LZ4HC_literalsPrice(llen + rPos);
- opt[rPos].mlen = 1;
- opt[rPos].off = 0;
- opt[rPos].litlen = llen + rPos;
- opt[rPos].price = cost;
- DEBUGLOG(7, "rPos:%3i => price:%3i (litlen=%i) -- initial setup",
- rPos, cost, opt[rPos].litlen);
- } }
- /* set prices using initial match */
- { int mlen = MINMATCH;
- int const matchML = firstMatch.len; /* necessarily < sufficient_len < LZ4_OPT_NUM */
- int const offset = firstMatch.off;
- assert(matchML < LZ4_OPT_NUM);
- for ( ; mlen <= matchML ; mlen++) {
- int const cost = LZ4HC_sequencePrice(llen, mlen);
- opt[mlen].mlen = mlen;
- opt[mlen].off = offset;
- opt[mlen].litlen = llen;
- opt[mlen].price = cost;
- DEBUGLOG(7, "rPos:%3i => price:%3i (matchlen=%i) -- initial setup",
- mlen, cost, mlen);
- } }
- last_match_pos = firstMatch.len;
- { int addLit;
- for (addLit = 1; addLit <= TRAILING_LITERALS; addLit ++) {
- opt[last_match_pos+addLit].mlen = 1; /* literal */
- opt[last_match_pos+addLit].off = 0;
- opt[last_match_pos+addLit].litlen = addLit;
- opt[last_match_pos+addLit].price = opt[last_match_pos].price + LZ4HC_literalsPrice(addLit);
- DEBUGLOG(7, "rPos:%3i => price:%3i (litlen=%i) -- initial setup",
- last_match_pos+addLit, opt[last_match_pos+addLit].price, addLit);
- } }
-
- /* check further positions */
- for (cur = 1; cur < last_match_pos; cur++) {
- const BYTE* const curPtr = ip + cur;
- LZ4HC_match_t newMatch;
-
- if (curPtr > mflimit) break;
- DEBUGLOG(7, "rPos:%u[%u] vs [%u]%u",
- cur, opt[cur].price, opt[cur+1].price, cur+1);
- if (fullUpdate) {
- /* not useful to search here if next position has same (or lower) cost */
- if ( (opt[cur+1].price <= opt[cur].price)
- /* in some cases, next position has same cost, but cost rises sharply after, so a small match would still be beneficial */
- && (opt[cur+MINMATCH].price < opt[cur].price + 3/*min seq price*/) )
- continue;
- } else {
- /* not useful to search here if next position has same (or lower) cost */
- if (opt[cur+1].price <= opt[cur].price) continue;
- }
-
- DEBUGLOG(7, "search at rPos:%u", cur);
- if (fullUpdate)
- newMatch = LZ4HC_FindLongerMatch(ctx, curPtr, matchlimit, MINMATCH-1, nbSearches, dict, favorDecSpeed);
- else
- /* only test matches of minimum length; slightly faster, but misses a few bytes */
- newMatch = LZ4HC_FindLongerMatch(ctx, curPtr, matchlimit, last_match_pos - cur, nbSearches, dict, favorDecSpeed);
- if (!newMatch.len) continue;
-
- if ( ((size_t)newMatch.len > sufficient_len)
- || (newMatch.len + cur >= LZ4_OPT_NUM) ) {
- /* immediate encoding */
- best_mlen = newMatch.len;
- best_off = newMatch.off;
- last_match_pos = cur + 1;
- goto encode;
- }
-
- /* before match : set price with literals at beginning */
- { int const baseLitlen = opt[cur].litlen;
- int litlen;
- for (litlen = 1; litlen < MINMATCH; litlen++) {
- int const price = opt[cur].price - LZ4HC_literalsPrice(baseLitlen) + LZ4HC_literalsPrice(baseLitlen+litlen);
- int const pos = cur + litlen;
- if (price < opt[pos].price) {
- opt[pos].mlen = 1; /* literal */
- opt[pos].off = 0;
- opt[pos].litlen = baseLitlen+litlen;
- opt[pos].price = price;
- DEBUGLOG(7, "rPos:%3i => price:%3i (litlen=%i)",
- pos, price, opt[pos].litlen);
- } } }
-
- /* set prices using match at position = cur */
- { int const matchML = newMatch.len;
- int ml = MINMATCH;
-
- assert(cur + newMatch.len < LZ4_OPT_NUM);
- for ( ; ml <= matchML ; ml++) {
- int const pos = cur + ml;
- int const offset = newMatch.off;
- int price;
- int ll;
- DEBUGLOG(7, "testing price rPos %i (last_match_pos=%i)",
- pos, last_match_pos);
- if (opt[cur].mlen == 1) {
- ll = opt[cur].litlen;
- price = ((cur > ll) ? opt[cur - ll].price : 0)
- + LZ4HC_sequencePrice(ll, ml);
- } else {
- ll = 0;
- price = opt[cur].price + LZ4HC_sequencePrice(0, ml);
- }
-
- assert((U32)favorDecSpeed <= 1);
- if (pos > last_match_pos+TRAILING_LITERALS
- || price <= opt[pos].price - (int)favorDecSpeed) {
- DEBUGLOG(7, "rPos:%3i => price:%3i (matchlen=%i)",
- pos, price, ml);
- assert(pos < LZ4_OPT_NUM);
- if ( (ml == matchML) /* last pos of last match */
- && (last_match_pos < pos) )
- last_match_pos = pos;
- opt[pos].mlen = ml;
- opt[pos].off = offset;
- opt[pos].litlen = ll;
- opt[pos].price = price;
- } } }
- /* complete following positions with literals */
- { int addLit;
- for (addLit = 1; addLit <= TRAILING_LITERALS; addLit ++) {
- opt[last_match_pos+addLit].mlen = 1; /* literal */
- opt[last_match_pos+addLit].off = 0;
- opt[last_match_pos+addLit].litlen = addLit;
- opt[last_match_pos+addLit].price = opt[last_match_pos].price + LZ4HC_literalsPrice(addLit);
- DEBUGLOG(7, "rPos:%3i => price:%3i (litlen=%i)", last_match_pos+addLit, opt[last_match_pos+addLit].price, addLit);
- } }
- } /* for (cur = 1; cur <= last_match_pos; cur++) */
-
- assert(last_match_pos < LZ4_OPT_NUM + TRAILING_LITERALS);
- best_mlen = opt[last_match_pos].mlen;
- best_off = opt[last_match_pos].off;
- cur = last_match_pos - best_mlen;
-
- encode: /* cur, last_match_pos, best_mlen, best_off must be set */
- assert(cur < LZ4_OPT_NUM);
- assert(last_match_pos >= 1); /* == 1 when only one candidate */
- DEBUGLOG(6, "reverse traversal, looking for shortest path (last_match_pos=%i)", last_match_pos);
- { int candidate_pos = cur;
- int selected_matchLength = best_mlen;
- int selected_offset = best_off;
- while (1) { /* from end to beginning */
- int const next_matchLength = opt[candidate_pos].mlen; /* can be 1, means literal */
- int const next_offset = opt[candidate_pos].off;
- DEBUGLOG(7, "pos %i: sequence length %i", candidate_pos, selected_matchLength);
- opt[candidate_pos].mlen = selected_matchLength;
- opt[candidate_pos].off = selected_offset;
- selected_matchLength = next_matchLength;
- selected_offset = next_offset;
- if (next_matchLength > candidate_pos) break; /* last match elected, first match to encode */
- assert(next_matchLength > 0); /* can be 1, means literal */
- candidate_pos -= next_matchLength;
- } }
-
- /* encode all recorded sequences in order */
- { int rPos = 0; /* relative position (to ip) */
- while (rPos < last_match_pos) {
- int const ml = opt[rPos].mlen;
- int const offset = opt[rPos].off;
- if (ml == 1) { ip++; rPos++; continue; } /* literal; note: can end up with several literals, in which case, skip them */
- rPos += ml;
- assert(ml >= MINMATCH);
- assert((offset >= 1) && (offset <= LZ4_DISTANCE_MAX));
- opSaved = op;
- if ( LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), ml, ip - offset, limit, oend) ) /* updates ip, op and anchor */
- goto _dest_overflow;
- } }
- } /* while (ip <= mflimit) */
-
- _last_literals:
- /* Encode Last Literals */
- { size_t lastRunSize = (size_t)(iend - anchor); /* literals */
- size_t litLength = (lastRunSize + 255 - RUN_MASK) / 255;
- size_t const totalSize = 1 + litLength + lastRunSize;
- if (limit == fillOutput) oend += LASTLITERALS; /* restore correct value */
- if (limit && (op + totalSize > oend)) {
- if (limit == limitedOutput) return 0; /* Check output limit */
- /* adapt lastRunSize to fill 'dst' */
- lastRunSize = (size_t)(oend - op) - 1;
- litLength = (lastRunSize + 255 - RUN_MASK) / 255;
- lastRunSize -= litLength;
- }
- ip = anchor + lastRunSize;
-
- if (lastRunSize >= RUN_MASK) {
- size_t accumulator = lastRunSize - RUN_MASK;
- *op++ = (RUN_MASK << ML_BITS);
- for(; accumulator >= 255 ; accumulator -= 255) *op++ = 255;
- *op++ = (BYTE) accumulator;
- } else {
- *op++ = (BYTE)(lastRunSize << ML_BITS);
- }
- memcpy(op, anchor, lastRunSize);
- op += lastRunSize;
- }
-
- /* End */
- *srcSizePtr = (int) (((const char*)ip) - source);
- return (int) ((char*)op-dst);
-
- _dest_overflow:
- if (limit == fillOutput) {
- op = opSaved; /* restore correct out pointer */
- goto _last_literals;
- }
- return 0;
- }
diff --git a/lib/sqfs/comp/lz4/lz4hc.h b/lib/sqfs/comp/lz4/lz4hc.h
deleted file mode 100644
index 157d813..0000000
--- a/lib/sqfs/comp/lz4/lz4hc.h
+++ /dev/null
@@ -1,307 +0,0 @@
-/*
- LZ4 HC - High Compression Mode of LZ4
- Header File
- Copyright (C) 2011-2017, Yann Collet.
- BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions are
- met:
-
- * Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above
- copyright notice, this list of conditions and the following disclaimer
- in the documentation and/or other materials provided with the
- distribution.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- You can contact the author at :
- - LZ4 source repository : https://github.com/lz4/lz4
- - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
-*/
-#ifndef LZ4_HC_H_19834876238432
-#define LZ4_HC_H_19834876238432
-
-#if defined (__cplusplus)
-extern "C" {
-#endif
-
-/* --- Dependency --- */
-/* note : lz4hc requires lz4.h/lz4.c for compilation */
-#include "lz4.h" /* stddef, LZ4LIB_API, LZ4_DEPRECATED */
-
-
-/* --- Useful constants --- */
-#define LZ4HC_CLEVEL_MIN 3
-#define LZ4HC_CLEVEL_DEFAULT 9
-#define LZ4HC_CLEVEL_OPT_MIN 10
-#define LZ4HC_CLEVEL_MAX 12
-
-
-/*-************************************
- * Block Compression
- **************************************/
-/*! LZ4_compress_HC() :
- * Compress data from `src` into `dst`, using the powerful but slower "HC" algorithm.
- * `dst` must be already allocated.
- * Compression is guaranteed to succeed if `dstCapacity >= LZ4_compressBound(srcSize)` (see "lz4.h")
- * Max supported `srcSize` value is LZ4_MAX_INPUT_SIZE (see "lz4.h")
- * `compressionLevel` : any value between 1 and LZ4HC_CLEVEL_MAX will work.
- * Values > LZ4HC_CLEVEL_MAX behave the same as LZ4HC_CLEVEL_MAX.
- * @return : the number of bytes written into 'dst'
- * or 0 if compression fails.
- */
-LZ4LIB_API int LZ4_compress_HC (const char* src, char* dst, int srcSize, int dstCapacity, int compressionLevel);
-
-
-/* Note :
- * Decompression functions are provided within "lz4.h" (BSD license)
- */
-
-
-/*! LZ4_compress_HC_extStateHC() :
- * Same as LZ4_compress_HC(), but using an externally allocated memory segment for `state`.
- * `state` size is provided by LZ4_sizeofStateHC().
- * Memory segment must be aligned on 8-bytes boundaries (which a normal malloc() should do properly).
- */
-LZ4LIB_API int LZ4_sizeofStateHC(void);
-LZ4LIB_API int LZ4_compress_HC_extStateHC(void* stateHC, const char* src, char* dst, int srcSize, int maxDstSize, int compressionLevel);
-
-
-/*! LZ4_compress_HC_destSize() : v1.9.0+
- * Will compress as much data as possible from `src`
- * to fit into `targetDstSize` budget.
- * Result is provided in 2 parts :
- * @return : the number of bytes written into 'dst' (necessarily <= targetDstSize)
- * or 0 if compression fails.
- * `srcSizePtr` : on success, *srcSizePtr is updated to indicate how much bytes were read from `src`
- */
-LZ4LIB_API int LZ4_compress_HC_destSize(void* stateHC,
- const char* src, char* dst,
- int* srcSizePtr, int targetDstSize,
- int compressionLevel);
-
-
-/*-************************************
- * Streaming Compression
- * Bufferless synchronous API
- **************************************/
- typedef union LZ4_streamHC_u LZ4_streamHC_t; /* incomplete type (defined later) */
-
-/*
- These functions compress data in successive blocks of any size,
- using previous blocks as dictionary, to improve compression ratio.
- One key assumption is that previous blocks (up to 64 KB) remain read-accessible while compressing next blocks.
- There is an exception for ring buffers, which can be smaller than 64 KB.
- Ring-buffer scenario is automatically detected and handled within LZ4_compress_HC_continue().
-
- Before starting compression, state must be allocated and properly initialized.
- LZ4_createStreamHC() does both, though compression level is set to LZ4HC_CLEVEL_DEFAULT.
-
- Selecting the compression level can be done with LZ4_resetStreamHC_fast() (starts a new stream)
- or LZ4_setCompressionLevel() (anytime, between blocks in the same stream) (experimental).
- LZ4_resetStreamHC_fast() only works on states which have been properly initialized at least once,
- which is automatically the case when state is created using LZ4_createStreamHC().
-
- After reset, a first "fictional block" can be designated as initial dictionary,
- using LZ4_loadDictHC() (Optional).
-
- Invoke LZ4_compress_HC_continue() to compress each successive block.
- The number of blocks is unlimited.
- Previous input blocks, including initial dictionary when present,
- must remain accessible and unmodified during compression.
-
- It's allowed to update compression level anytime between blocks,
- using LZ4_setCompressionLevel() (experimental).
-
- 'dst' buffer should be sized to handle worst case scenarios
- (see LZ4_compressBound(), it ensures compression success).
- In case of failure, the API does not guarantee recovery,
- so the state _must_ be reset.
- To ensure compression success
- whenever `dst` buffer size cannot be made >= LZ4_compressBound(),
- consider using LZ4_compress_HC_continue_destSize().
-
- Whenever previous input blocks can't be preserved unmodified in-place during compression of next blocks,
- it's possible to copy the last blocks into a more stable memory space, using LZ4_saveDictHC().
- Return value of LZ4_saveDictHC() is the size of dictionary effectively saved into 'safeBuffer' (<= 64 KB)
-
- After completing a streaming compression,
- it's possible to start a new stream of blocks, using the same LZ4_streamHC_t state,
- just by resetting it, using LZ4_resetStreamHC_fast().
-*/
-
-LZ4LIB_API void LZ4_resetStreamHC_fast(LZ4_streamHC_t* streamHCPtr, int compressionLevel); /* v1.9.0+ */
-
-/*^**********************************************
- * !!!!!! STATIC LINKING ONLY !!!!!!
- ***********************************************/
-
-/*-******************************************************************
- * PRIVATE DEFINITIONS :
- * Do not use these definitions directly.
- * They are merely exposed to allow static allocation of `LZ4_streamHC_t`.
- * Declare an `LZ4_streamHC_t` directly, rather than any type below.
- * Even then, only do so in the context of static linking, as definitions may change between versions.
- ********************************************************************/
-
-#define LZ4HC_DICTIONARY_LOGSIZE 16
-#define LZ4HC_MAXD (1<<LZ4HC_DICTIONARY_LOGSIZE)
-#define LZ4HC_MAXD_MASK (LZ4HC_MAXD - 1)
-
-#define LZ4HC_HASH_LOG 15
-#define LZ4HC_HASHTABLESIZE (1 << LZ4HC_HASH_LOG)
-#define LZ4HC_HASH_MASK (LZ4HC_HASHTABLESIZE - 1)
-
-
-#if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
-#include <stdint.h>
-
-typedef struct LZ4HC_CCtx_internal LZ4HC_CCtx_internal;
-struct LZ4HC_CCtx_internal
-{
- uint32_t hashTable[LZ4HC_HASHTABLESIZE];
- uint16_t chainTable[LZ4HC_MAXD];
- const uint8_t* end; /* next block here to continue on current prefix */
- const uint8_t* base; /* All index relative to this position */
- const uint8_t* dictBase; /* alternate base for extDict */
- uint32_t dictLimit; /* below that point, need extDict */
- uint32_t lowLimit; /* below that point, no more dict */
- uint32_t nextToUpdate; /* index from which to continue dictionary update */
- short compressionLevel;
- int8_t favorDecSpeed; /* favor decompression speed if this flag set,
- otherwise, favor compression ratio */
- int8_t dirty; /* stream has to be fully reset if this flag is set */
- const LZ4HC_CCtx_internal* dictCtx;
-};
-
-#else
-
-typedef struct LZ4HC_CCtx_internal LZ4HC_CCtx_internal;
-struct LZ4HC_CCtx_internal
-{
- unsigned int hashTable[LZ4HC_HASHTABLESIZE];
- unsigned short chainTable[LZ4HC_MAXD];
- const unsigned char* end; /* next block here to continue on current prefix */
- const unsigned char* base; /* All index relative to this position */
- const unsigned char* dictBase; /* alternate base for extDict */
- unsigned int dictLimit; /* below that point, need extDict */
- unsigned int lowLimit; /* below that point, no more dict */
- unsigned int nextToUpdate; /* index from which to continue dictionary update */
- short compressionLevel;
- char favorDecSpeed; /* favor decompression speed if this flag set,
- otherwise, favor compression ratio */
- char dirty; /* stream has to be fully reset if this flag is set */
- const LZ4HC_CCtx_internal* dictCtx;
-};
-
-#endif
-
-
-/* Do not use these definitions directly !
- * Declare or allocate an LZ4_streamHC_t instead.
- */
-#define LZ4_STREAMHCSIZE (4*LZ4HC_HASHTABLESIZE + 2*LZ4HC_MAXD + 56 + ((sizeof(void*)==16) ? 56 : 0) /* AS400*/ ) /* 262200 or 262256*/
-#define LZ4_STREAMHCSIZE_SIZET (LZ4_STREAMHCSIZE / sizeof(size_t))
-union LZ4_streamHC_u {
- size_t table[LZ4_STREAMHCSIZE_SIZET];
- LZ4HC_CCtx_internal internal_donotuse;
-}; /* previously typedef'd to LZ4_streamHC_t */
-
-/* LZ4_streamHC_t :
- * This structure allows static allocation of LZ4 HC streaming state.
- * This can be used to allocate statically, on state, or as part of a larger structure.
- *
- * Such state **must** be initialized using LZ4_initStreamHC() before first use.
- *
- * Note that invoking LZ4_initStreamHC() is not required when
- * the state was created using LZ4_createStreamHC() (which is recommended).
- * Using the normal builder, a newly created state is automatically initialized.
- *
- * Static allocation shall only be used in combination with static linking.
- */
-
-/* LZ4_initStreamHC() : v1.9.0+
- * Required before first use of a statically allocated LZ4_streamHC_t.
- * Before v1.9.0 : use LZ4_resetStreamHC() instead
- */
-LZ4LIB_API LZ4_streamHC_t* LZ4_initStreamHC (void* buffer, size_t size);
-
-#if defined (__cplusplus)
-}
-#endif
-
-#endif /* LZ4_HC_H_19834876238432 */
-
-
-/*-**************************************************
- * !!!!! STATIC LINKING ONLY !!!!!
- * Following definitions are considered experimental.
- * They should not be linked from DLL,
- * as there is no guarantee of API stability yet.
- * Prototypes will be promoted to "stable" status
- * after successfull usage in real-life scenarios.
- ***************************************************/
-#ifdef LZ4_HC_STATIC_LINKING_ONLY /* protection macro */
-#ifndef LZ4_HC_SLO_098092834
-#define LZ4_HC_SLO_098092834
-
-#define LZ4_STATIC_LINKING_ONLY /* LZ4LIB_STATIC_API */
-#include "lz4.h"
-
-#if defined (__cplusplus)
-extern "C" {
-#endif
-
-/*! LZ4_setCompressionLevel() : v1.8.0+ (experimental)
- * It's possible to change compression level
- * between successive invocations of LZ4_compress_HC_continue*()
- * for dynamic adaptation.
- */
-LZ4LIB_STATIC_API void LZ4_setCompressionLevel(
- LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel);
-
-/*! LZ4_resetStreamHC_fast() : v1.9.0+
- * When an LZ4_streamHC_t is known to be in a internally coherent state,
- * it can often be prepared for a new compression with almost no work, only
- * sometimes falling back to the full, expensive reset that is always required
- * when the stream is in an indeterminate state (i.e., the reset performed by
- * LZ4_resetStreamHC()).
- *
- * LZ4_streamHCs are guaranteed to be in a valid state when:
- * - returned from LZ4_createStreamHC()
- * - reset by LZ4_resetStreamHC()
- * - memset(stream, 0, sizeof(LZ4_streamHC_t))
- * - the stream was in a valid state and was reset by LZ4_resetStreamHC_fast()
- * - the stream was in a valid state and was then used in any compression call
- * that returned success
- * - the stream was in an indeterminate state and was used in a compression
- * call that fully reset the state (LZ4_compress_HC_extStateHC()) and that
- * returned success
- *
- * Note:
- * A stream that was last used in a compression call that returned an error
- * may be passed to this function. However, it will be fully reset, which will
- * clear any existing history and settings from the context.
- */
-LZ4LIB_STATIC_API void LZ4_resetStreamHC_fast(
- LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel);
-
-#if defined (__cplusplus)
-}
-#endif
-
-#endif /* LZ4_HC_SLO_098092834 */
-#endif /* LZ4_HC_STATIC_LINKING_ONLY */
diff --git a/lib/sqfs/comp/zlib/README b/lib/sqfs/comp/zlib/README
deleted file mode 100644
index 6052c33..0000000
--- a/lib/sqfs/comp/zlib/README
+++ /dev/null
@@ -1,195 +0,0 @@
-Changes made for inclusion in libsquashfs:
-
- NOTE: THE SOURCE CODE IN THIS DIRECTORY IS NOT THE ORIGINAL ZLIB
- SOURCE CODE!
-
- A number of things were removed for inclusion in libsquashfs, part of the
- squashfs-tools-ng package.
-
- The original package that the source code in this directory is based on
- is the zlib-1.2.11 source tar ball obtained from http://zlib.net/ on
- October 16, 2017.
-
- An attempt has been made at removing the entire build system, samples,
- tests, documentation, 3rd party contributions, gzip support and various
- utility functions.
-
- The following sub-directories were removed with all there contents:
- amiga/
- contrib/
- doc/
- examples/
- msdos/
- nintendods/
- old/
- os400/
- qnx/
- test/
- watcom/
- win32/
-
- The following source files were removed in their entirety:
- gzread.c
- gzclose.c
- gzwrite.c
- gzguts.h
- gzlib.c
- gzguts.h
- compress.c
- uncompr.c
- infback.c
- crc32.c
- crc32.h
-
- The following source files were modified (modifications marked with a
- comment in the source):
- zutil.c
- inflate.c
- deflate.c
- inftrees.c
- zconf.h
- zutil.h
-
- The following additional files were removed in their entirety:
- ChangeLog
- CMakeLists.txt
- configure
- FAQ
- INDEX
- Makefile
- Makefile.in
- make_vms.com
- treebuild.xml
- zconf.h.cmakein
- zconf.h.in
- zlib.3
- zlib.3.pdf
- zlib.map
- zlib.pc.cmakein
- zlib.pc.in
- zlib2ansi
-
- The following additional files were modified:
- README
-
- A copy of the zlib license is included in licenses/zlib.txt in the root
- directory of the squashfs-tools-ng source package.
-
-Rest of the original README follows:
--------------------------------------------------------------------------------
-
-ZLIB DATA COMPRESSION LIBRARY
-
-zlib 1.2.11 is a general purpose data compression library. All the code is
-thread safe. The data format used by the zlib library is described by RFCs
-(Request for Comments) 1950 to 1952 in the files
-http://tools.ietf.org/html/rfc1950 (zlib format), rfc1951 (deflate format) and
-rfc1952 (gzip format).
-
-All functions of the compression library are documented in the file zlib.h
-(volunteer to write man pages welcome, contact zlib@gzip.org). A usage example
-of the library is given in the file test/example.c which also tests that
-the library is working correctly. Another example is given in the file
-test/minigzip.c. The compression library itself is composed of all source
-files in the root directory.
-
-To compile all files and run the test program, follow the instructions given at
-the top of Makefile.in. In short "./configure; make test", and if that goes
-well, "make install" should work for most flavors of Unix. For Windows, use
-one of the special makefiles in win32/ or contrib/vstudio/ . For VMS, use
-make_vms.com.
-
-Questions about zlib should be sent to <zlib@gzip.org>, or to Gilles Vollant
-<info@winimage.com> for the Windows DLL version. The zlib home page is
-http://zlib.net/ . Before reporting a problem, please check this site to
-verify that you have the latest version of zlib; otherwise get the latest
-version and check whether the problem still exists or not.
-
-PLEASE read the zlib FAQ http://zlib.net/zlib_faq.html before asking for help.
-
-Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan. 1997
-issue of Dr. Dobb's Journal; a copy of the article is available at
-http://marknelson.us/1997/01/01/zlib-engine/ .
-
-The changes made in version 1.2.11 are documented in the file ChangeLog.
-
-Unsupported third party contributions are provided in directory contrib/ .
-
-zlib is available in Java using the java.util.zip package, documented at
-http://java.sun.com/developer/technicalArticles/Programming/compression/ .
-
-A Perl interface to zlib written by Paul Marquess <pmqs@cpan.org> is available
-at CPAN (Comprehensive Perl Archive Network) sites, including
-http://search.cpan.org/~pmqs/IO-Compress-Zlib/ .
-
-A Python interface to zlib written by A.M. Kuchling <amk@amk.ca> is
-available in Python 1.5 and later versions, see
-http://docs.python.org/library/zlib.html .
-
-zlib is built into tcl: http://wiki.tcl.tk/4610 .
-
-An experimental package to read and write files in .zip format, written on top
-of zlib by Gilles Vollant <info@winimage.com>, is available in the
-contrib/minizip directory of zlib.
-
-
-Notes for some targets:
-
-- For Windows DLL versions, please see win32/DLL_FAQ.txt
-
-- For 64-bit Irix, deflate.c must be compiled without any optimization. With
- -O, one libpng test fails. The test works in 32 bit mode (with the -n32
- compiler flag). The compiler bug has been reported to SGI.
-
-- zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1 it works
- when compiled with cc.
-
-- On Digital Unix 4.0D (formely OSF/1) on AlphaServer, the cc option -std1 is
- necessary to get gzprintf working correctly. This is done by configure.
-
-- zlib doesn't work on HP-UX 9.05 with some versions of /bin/cc. It works with
- other compilers. Use "make test" to check your compiler.
-
-- gzdopen is not supported on RISCOS or BEOS.
-
-- For PalmOs, see http://palmzlib.sourceforge.net/
-
-
-Acknowledgments:
-
- The deflate format used by zlib was defined by Phil Katz. The deflate and
- zlib specifications were written by L. Peter Deutsch. Thanks to all the
- people who reported problems and suggested various improvements in zlib; they
- are too numerous to cite here.
-
-Copyright notice:
-
- (C) 1995-2017 Jean-loup Gailly and Mark Adler
-
- This software is provided 'as-is', without any express or implied
- warranty. In no event will the authors be held liable for any damages
- arising from the use of this software.
-
- Permission is granted to anyone to use this software for any purpose,
- including commercial applications, and to alter it and redistribute it
- freely, subject to the following restrictions:
-
- 1. The origin of this software must not be misrepresented; you must not
- claim that you wrote the original software. If you use this software
- in a product, an acknowledgment in the product documentation would be
- appreciated but is not required.
- 2. Altered source versions must be plainly marked as such, and must not be
- misrepresented as being the original software.
- 3. This notice may not be removed or altered from any source distribution.
-
- Jean-loup Gailly Mark Adler
- jloup@gzip.org madler@alumni.caltech.edu
-
-If you use the zlib library in a product, we would appreciate *not* receiving
-lengthy legal documents to sign. The sources are provided for free but without
-warranty of any kind. The library has been entirely written by Jean-loup
-Gailly and Mark Adler; it does not include third-party code.
-
-If you redistribute modified sources, we would appreciate that you include in
-the file ChangeLog history information documenting your changes. Please read
-the FAQ for more information on the distribution of modified source versions.
diff --git a/lib/sqfs/comp/zlib/adler32.c b/lib/sqfs/comp/zlib/adler32.c
deleted file mode 100644
index d0be438..0000000
--- a/lib/sqfs/comp/zlib/adler32.c
+++ /dev/null
@@ -1,186 +0,0 @@
-/* adler32.c -- compute the Adler-32 checksum of a data stream
- * Copyright (C) 1995-2011, 2016 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* @(#) $Id$ */
-
-#include "zutil.h"
-
-local uLong adler32_combine_ OF((uLong adler1, uLong adler2, z_off64_t len2));
-
-#define BASE 65521U /* largest prime smaller than 65536 */
-#define NMAX 5552
-/* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
-
-#define DO1(buf,i) {adler += (buf)[i]; sum2 += adler;}
-#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);
-#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);
-#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);
-#define DO16(buf) DO8(buf,0); DO8(buf,8);
-
-/* use NO_DIVIDE if your processor does not do division in hardware --
- try it both ways to see which is faster */
-#ifdef NO_DIVIDE
-/* note that this assumes BASE is 65521, where 65536 % 65521 == 15
- (thank you to John Reiser for pointing this out) */
-# define CHOP(a) \
- do { \
- unsigned long tmp = a >> 16; \
- a &= 0xffffUL; \
- a += (tmp << 4) - tmp; \
- } while (0)
-# define MOD28(a) \
- do { \
- CHOP(a); \
- if (a >= BASE) a -= BASE; \
- } while (0)
-# define MOD(a) \
- do { \
- CHOP(a); \
- MOD28(a); \
- } while (0)
-# define MOD63(a) \
- do { /* this assumes a is not negative */ \
- z_off64_t tmp = a >> 32; \
- a &= 0xffffffffL; \
- a += (tmp << 8) - (tmp << 5) + tmp; \
- tmp = a >> 16; \
- a &= 0xffffL; \
- a += (tmp << 4) - tmp; \
- tmp = a >> 16; \
- a &= 0xffffL; \
- a += (tmp << 4) - tmp; \
- if (a >= BASE) a -= BASE; \
- } while (0)
-#else
-# define MOD(a) a %= BASE
-# define MOD28(a) a %= BASE
-# define MOD63(a) a %= BASE
-#endif
-
-/* ========================================================================= */
-uLong ZEXPORT adler32_z(adler, buf, len)
- uLong adler;
- const Bytef *buf;
- z_size_t len;
-{
- unsigned long sum2;
- unsigned n;
-
- /* split Adler-32 into component sums */
- sum2 = (adler >> 16) & 0xffff;
- adler &= 0xffff;
-
- /* in case user likes doing a byte at a time, keep it fast */
- if (len == 1) {
- adler += buf[0];
- if (adler >= BASE)
- adler -= BASE;
- sum2 += adler;
- if (sum2 >= BASE)
- sum2 -= BASE;
- return adler | (sum2 << 16);
- }
-
- /* initial Adler-32 value (deferred check for len == 1 speed) */
- if (buf == Z_NULL)
- return 1L;
-
- /* in case short lengths are provided, keep it somewhat fast */
- if (len < 16) {
- while (len--) {
- adler += *buf++;
- sum2 += adler;
- }
- if (adler >= BASE)
- adler -= BASE;
- MOD28(sum2); /* only added so many BASE's */
- return adler | (sum2 << 16);
- }
-
- /* do length NMAX blocks -- requires just one modulo operation */
- while (len >= NMAX) {
- len -= NMAX;
- n = NMAX / 16; /* NMAX is divisible by 16 */
- do {
- DO16(buf); /* 16 sums unrolled */
- buf += 16;
- } while (--n);
- MOD(adler);
- MOD(sum2);
- }
-
- /* do remaining bytes (less than NMAX, still just one modulo) */
- if (len) { /* avoid modulos if none remaining */
- while (len >= 16) {
- len -= 16;
- DO16(buf);
- buf += 16;
- }
- while (len--) {
- adler += *buf++;
- sum2 += adler;
- }
- MOD(adler);
- MOD(sum2);
- }
-
- /* return recombined sums */
- return adler | (sum2 << 16);
-}
-
-/* ========================================================================= */
-uLong ZEXPORT adler32(adler, buf, len)
- uLong adler;
- const Bytef *buf;
- uInt len;
-{
- return adler32_z(adler, buf, len);
-}
-
-/* ========================================================================= */
-local uLong adler32_combine_(adler1, adler2, len2)
- uLong adler1;
- uLong adler2;
- z_off64_t len2;
-{
- unsigned long sum1;
- unsigned long sum2;
- unsigned rem;
-
- /* for negative len, return invalid adler32 as a clue for debugging */
- if (len2 < 0)
- return 0xffffffffUL;
-
- /* the derivation of this formula is left as an exercise for the reader */
- MOD63(len2); /* assumes len2 >= 0 */
- rem = (unsigned)len2;
- sum1 = adler1 & 0xffff;
- sum2 = rem * sum1;
- MOD(sum2);
- sum1 += (adler2 & 0xffff) + BASE - 1;
- sum2 += ((adler1 >> 16) & 0xffff) + ((adler2 >> 16) & 0xffff) + BASE - rem;
- if (sum1 >= BASE) sum1 -= BASE;
- if (sum1 >= BASE) sum1 -= BASE;
- if (sum2 >= ((unsigned long)BASE << 1)) sum2 -= ((unsigned long)BASE << 1);
- if (sum2 >= BASE) sum2 -= BASE;
- return sum1 | (sum2 << 16);
-}
-
-/* ========================================================================= */
-uLong ZEXPORT adler32_combine(adler1, adler2, len2)
- uLong adler1;
- uLong adler2;
- z_off_t len2;
-{
- return adler32_combine_(adler1, adler2, len2);
-}
-
-uLong ZEXPORT adler32_combine64(adler1, adler2, len2)
- uLong adler1;
- uLong adler2;
- z_off64_t len2;
-{
- return adler32_combine_(adler1, adler2, len2);
-}
diff --git a/lib/sqfs/comp/zlib/deflate.c b/lib/sqfs/comp/zlib/deflate.c
deleted file mode 100644
index 1c974d0..0000000
--- a/lib/sqfs/comp/zlib/deflate.c
+++ /dev/null
@@ -1,2168 +0,0 @@
-/* deflate.c -- compress data using the deflation algorithm
- * Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/*
- * ALGORITHM
- *
- * The "deflation" process depends on being able to identify portions
- * of the input text which are identical to earlier input (within a
- * sliding window trailing behind the input currently being processed).
- *
- * The most straightforward technique turns out to be the fastest for
- * most input files: try all possible matches and select the longest.
- * The key feature of this algorithm is that insertions into the string
- * dictionary are very simple and thus fast, and deletions are avoided
- * completely. Insertions are performed at each input character, whereas
- * string matches are performed only when the previous match ends. So it
- * is preferable to spend more time in matches to allow very fast string
- * insertions and avoid deletions. The matching algorithm for small
- * strings is inspired from that of Rabin & Karp. A brute force approach
- * is used to find longer strings when a small match has been found.
- * A similar algorithm is used in comic (by Jan-Mark Wams) and freeze
- * (by Leonid Broukhis).
- * A previous version of this file used a more sophisticated algorithm
- * (by Fiala and Greene) which is guaranteed to run in linear amortized
- * time, but has a larger average cost, uses more memory and is patented.
- * However the F&G algorithm may be faster for some highly redundant
- * files if the parameter max_chain_length (described below) is too large.
- *
- * ACKNOWLEDGEMENTS
- *
- * The idea of lazy evaluation of matches is due to Jan-Mark Wams, and
- * I found it in 'freeze' written by Leonid Broukhis.
- * Thanks to many people for bug reports and testing.
- *
- * REFERENCES
- *
- * Deutsch, L.P.,"DEFLATE Compressed Data Format Specification".
- * Available in http://tools.ietf.org/html/rfc1951
- *
- * A description of the Rabin and Karp algorithm is given in the book
- * "Algorithms" by R. Sedgewick, Addison-Wesley, p252.
- *
- * Fiala,E.R., and Greene,D.H.
- * Data Compression with Finite Windows, Comm.ACM, 32,4 (1989) 490-595
- *
- */
-
-/* @(#) $Id$ */
-
-#include "deflate.h"
-
-/*
- XXX: Not original zlib source code. The following 2 lines were
- commented out by David Oberhollenzer for use in in libsquashfs.
-
-const char deflate_copyright[] =
- " deflate 1.2.11 Copyright 1995-2017 Jean-loup Gailly and Mark Adler ";
-*/
-/*
- If you use the zlib library in a product, an acknowledgment is welcome
- in the documentation of your product. If for some reason you cannot
- include such an acknowledgment, I would appreciate that you keep this
- copyright string in the executable of your product.
- */
-
-/* ===========================================================================
- * Function prototypes.
- */
-typedef enum {
- need_more, /* block not completed, need more input or more output */
- block_done, /* block flush performed */
- finish_started, /* finish started, need only more output at next deflate */
- finish_done /* finish done, accept no more input or output */
-} block_state;
-
-typedef block_state (*compress_func) OF((deflate_state *s, int flush));
-/* Compression function. Returns the block state after the call. */
-
-local int deflateStateCheck OF((z_streamp strm));
-local void slide_hash OF((deflate_state *s));
-local void fill_window OF((deflate_state *s));
-local block_state deflate_stored OF((deflate_state *s, int flush));
-local block_state deflate_fast OF((deflate_state *s, int flush));
-#ifndef FASTEST
-local block_state deflate_slow OF((deflate_state *s, int flush));
-#endif
-local block_state deflate_rle OF((deflate_state *s, int flush));
-local block_state deflate_huff OF((deflate_state *s, int flush));
-local void lm_init OF((deflate_state *s));
-local void putShortMSB OF((deflate_state *s, uInt b));
-local void flush_pending OF((z_streamp strm));
-local unsigned read_buf OF((z_streamp strm, Bytef *buf, unsigned size));
-#ifdef ASMV
-# pragma message("Assembler code may have bugs -- use at your own risk")
- void match_init OF((void)); /* asm code initialization */
- uInt longest_match OF((deflate_state *s, IPos cur_match));
-#else
-local uInt longest_match OF((deflate_state *s, IPos cur_match));
-#endif
-
-#ifdef ZLIB_DEBUG
-local void check_match OF((deflate_state *s, IPos start, IPos match,
- int length));
-#endif
-
-/* ===========================================================================
- * Local data
- */
-
-#define NIL 0
-/* Tail of hash chains */
-
-#ifndef TOO_FAR
-# define TOO_FAR 4096
-#endif
-/* Matches of length 3 are discarded if their distance exceeds TOO_FAR */
-
-/* Values for max_lazy_match, good_match and max_chain_length, depending on
- * the desired pack level (0..9). The values given below have been tuned to
- * exclude worst case performance for pathological files. Better values may be
- * found for specific files.
- */
-typedef struct config_s {
- ush good_length; /* reduce lazy search above this match length */
- ush max_lazy; /* do not perform lazy search above this match length */
- ush nice_length; /* quit search above this match length */
- ush max_chain;
- compress_func func;
-} config;
-
-#ifdef FASTEST
-local const config configuration_table[2] = {
-/* good lazy nice chain */
-/* 0 */ {0, 0, 0, 0, deflate_stored}, /* store only */
-/* 1 */ {4, 4, 8, 4, deflate_fast}}; /* max speed, no lazy matches */
-#else
-local const config configuration_table[10] = {
-/* good lazy nice chain */
-/* 0 */ {0, 0, 0, 0, deflate_stored}, /* store only */
-/* 1 */ {4, 4, 8, 4, deflate_fast}, /* max speed, no lazy matches */
-/* 2 */ {4, 5, 16, 8, deflate_fast},
-/* 3 */ {4, 6, 32, 32, deflate_fast},
-
-/* 4 */ {4, 4, 16, 16, deflate_slow}, /* lazy matches */
-/* 5 */ {8, 16, 32, 32, deflate_slow},
-/* 6 */ {8, 16, 128, 128, deflate_slow},
-/* 7 */ {8, 32, 128, 256, deflate_slow},
-/* 8 */ {32, 128, 258, 1024, deflate_slow},
-/* 9 */ {32, 258, 258, 4096, deflate_slow}}; /* max compression */
-#endif
-
-/* Note: the deflate() code requires max_lazy >= MIN_MATCH and max_chain >= 4
- * For deflate_fast() (levels <= 3) good is ignored and lazy has a different
- * meaning.
- */
-
-/* rank Z_BLOCK between Z_NO_FLUSH and Z_PARTIAL_FLUSH */
-#define RANK(f) (((f) * 2) - ((f) > 4 ? 9 : 0))
-
-/* ===========================================================================
- * Update a hash value with the given input byte
- * IN assertion: all calls to UPDATE_HASH are made with consecutive input
- * characters, so that a running hash key can be computed from the previous
- * key instead of complete recalculation each time.
- */
-#define UPDATE_HASH(s,h,c) (h = (((h)<<s->hash_shift) ^ (c)) & s->hash_mask)
-
-
-/* ===========================================================================
- * Insert string str in the dictionary and set match_head to the previous head
- * of the hash chain (the most recent string with same hash key). Return
- * the previous length of the hash chain.
- * If this file is compiled with -DFASTEST, the compression level is forced
- * to 1, and no hash chains are maintained.
- * IN assertion: all calls to INSERT_STRING are made with consecutive input
- * characters and the first MIN_MATCH bytes of str are valid (except for
- * the last MIN_MATCH-1 bytes of the input file).
- */
-#ifdef FASTEST
-#define INSERT_STRING(s, str, match_head) \
- (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \
- match_head = s->head[s->ins_h], \
- s->head[s->ins_h] = (Pos)(str))
-#else
-#define INSERT_STRING(s, str, match_head) \
- (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \
- match_head = s->prev[(str) & s->w_mask] = s->head[s->ins_h], \
- s->head[s->ins_h] = (Pos)(str))
-#endif
-
-/* ===========================================================================
- * Initialize the hash table (avoiding 64K overflow for 16 bit systems).
- * prev[] will be initialized on the fly.
- */
-#define CLEAR_HASH(s) \
- s->head[s->hash_size-1] = NIL; \
- zmemzero((Bytef *)s->head, (unsigned)(s->hash_size-1)*sizeof(*s->head));
-
-/* ===========================================================================
- * Slide the hash table when sliding the window down (could be avoided with 32
- * bit values at the expense of memory usage). We slide even when level == 0 to
- * keep the hash table consistent if we switch back to level > 0 later.
- */
-local void slide_hash(s)
- deflate_state *s;
-{
- unsigned n, m;
- Posf *p;
- uInt wsize = s->w_size;
-
- n = s->hash_size;
- p = &s->head[n];
- do {
- m = *--p;
- *p = (Pos)(m >= wsize ? m - wsize : NIL);
- } while (--n);
- n = wsize;
-#ifndef FASTEST
- p = &s->prev[n];
- do {
- m = *--p;
- *p = (Pos)(m >= wsize ? m - wsize : NIL);
- /* If n is not on any hash chain, prev[n] is garbage but
- * its value will never be used.
- */
- } while (--n);
-#endif
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateInit_(strm, level, version, stream_size)
- z_streamp strm;
- int level;
- const char *version;
- int stream_size;
-{
- return deflateInit2_(strm, level, Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL,
- Z_DEFAULT_STRATEGY, version, stream_size);
- /* To do: ignore strm->next_in if we use it as window */
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
- version, stream_size)
- z_streamp strm;
- int level;
- int method;
- int windowBits;
- int memLevel;
- int strategy;
- const char *version;
- int stream_size;
-{
- deflate_state *s;
- int wrap = 1;
- static const char my_version[] = ZLIB_VERSION;
-
- ushf *overlay;
- /* We overlay pending_buf and d_buf+l_buf. This works since the average
- * output size for (length,distance) codes is <= 24 bits.
- */
-
- if (version == Z_NULL || version[0] != my_version[0] ||
- stream_size != sizeof(z_stream)) {
- return Z_VERSION_ERROR;
- }
- if (strm == Z_NULL) return Z_STREAM_ERROR;
-
- strm->msg = Z_NULL;
- if (strm->zalloc == (alloc_func)0) {
-#ifdef Z_SOLO
- return Z_STREAM_ERROR;
-#else
- strm->zalloc = zcalloc;
- strm->opaque = (voidpf)0;
-#endif
- }
- if (strm->zfree == (free_func)0)
-#ifdef Z_SOLO
- return Z_STREAM_ERROR;
-#else
- strm->zfree = zcfree;
-#endif
-
-#ifdef FASTEST
- if (level != 0) level = 1;
-#else
- if (level == Z_DEFAULT_COMPRESSION) level = 6;
-#endif
-
- if (windowBits < 0) { /* suppress zlib wrapper */
- wrap = 0;
- windowBits = -windowBits;
- }
-#ifdef GZIP
- else if (windowBits > 15) {
- wrap = 2; /* write gzip wrapper instead */
- windowBits -= 16;
- }
-#endif
- if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED ||
- windowBits < 8 || windowBits > 15 || level < 0 || level > 9 ||
- strategy < 0 || strategy > Z_FIXED || (windowBits == 8 && wrap != 1)) {
- return Z_STREAM_ERROR;
- }
- if (windowBits == 8) windowBits = 9; /* until 256-byte window bug fixed */
- s = (deflate_state *) ZALLOC(strm, 1, sizeof(deflate_state));
- if (s == Z_NULL) return Z_MEM_ERROR;
- strm->state = (struct internal_state FAR *)s;
- s->strm = strm;
- s->status = INIT_STATE; /* to pass state test in deflateReset() */
-
- s->wrap = wrap;
- s->gzhead = Z_NULL;
- s->w_bits = (uInt)windowBits;
- s->w_size = 1 << s->w_bits;
- s->w_mask = s->w_size - 1;
-
- s->hash_bits = (uInt)memLevel + 7;
- s->hash_size = 1 << s->hash_bits;
- s->hash_mask = s->hash_size - 1;
- s->hash_shift = ((s->hash_bits+MIN_MATCH-1)/MIN_MATCH);
-
- s->window = (Bytef *) ZALLOC(strm, s->w_size, 2*sizeof(Byte));
- s->prev = (Posf *) ZALLOC(strm, s->w_size, sizeof(Pos));
- s->head = (Posf *) ZALLOC(strm, s->hash_size, sizeof(Pos));
-
- s->high_water = 0; /* nothing written to s->window yet */
-
- s->lit_bufsize = 1 << (memLevel + 6); /* 16K elements by default */
-
- overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2);
- s->pending_buf = (uchf *) overlay;
- s->pending_buf_size = (ulg)s->lit_bufsize * (sizeof(ush)+2L);
-
- if (s->window == Z_NULL || s->prev == Z_NULL || s->head == Z_NULL ||
- s->pending_buf == Z_NULL) {
- s->status = FINISH_STATE;
- strm->msg = ERR_MSG(Z_MEM_ERROR);
- deflateEnd (strm);
- return Z_MEM_ERROR;
- }
- s->d_buf = overlay + s->lit_bufsize/sizeof(ush);
- s->l_buf = s->pending_buf + (1+sizeof(ush))*s->lit_bufsize;
-
- s->level = level;
- s->strategy = strategy;
- s->method = (Byte)method;
-
- return deflateReset(strm);
-}
-
-/* =========================================================================
- * Check for a valid deflate stream state. Return 0 if ok, 1 if not.
- */
-local int deflateStateCheck (strm)
- z_streamp strm;
-{
- deflate_state *s;
- if (strm == Z_NULL ||
- strm->zalloc == (alloc_func)0 || strm->zfree == (free_func)0)
- return 1;
- s = strm->state;
- if (s == Z_NULL || s->strm != strm || (s->status != INIT_STATE &&
-#ifdef GZIP
- s->status != GZIP_STATE &&
-#endif
- s->status != EXTRA_STATE &&
- s->status != NAME_STATE &&
- s->status != COMMENT_STATE &&
- s->status != HCRC_STATE &&
- s->status != BUSY_STATE &&
- s->status != FINISH_STATE))
- return 1;
- return 0;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateSetDictionary (strm, dictionary, dictLength)
- z_streamp strm;
- const Bytef *dictionary;
- uInt dictLength;
-{
- deflate_state *s;
- uInt str, n;
- int wrap;
- unsigned avail;
- z_const unsigned char *next;
-
- if (deflateStateCheck(strm) || dictionary == Z_NULL)
- return Z_STREAM_ERROR;
- s = strm->state;
- wrap = s->wrap;
- if (wrap == 2 || (wrap == 1 && s->status != INIT_STATE) || s->lookahead)
- return Z_STREAM_ERROR;
-
- /* when using zlib wrappers, compute Adler-32 for provided dictionary */
- if (wrap == 1)
- strm->adler = adler32(strm->adler, dictionary, dictLength);
- s->wrap = 0; /* avoid computing Adler-32 in read_buf */
-
- /* if dictionary would fill window, just replace the history */
- if (dictLength >= s->w_size) {
- if (wrap == 0) { /* already empty otherwise */
- CLEAR_HASH(s);
- s->strstart = 0;
- s->block_start = 0L;
- s->insert = 0;
- }
- dictionary += dictLength - s->w_size; /* use the tail */
- dictLength = s->w_size;
- }
-
- /* insert dictionary into window and hash */
- avail = strm->avail_in;
- next = strm->next_in;
- strm->avail_in = dictLength;
- strm->next_in = (z_const Bytef *)dictionary;
- fill_window(s);
- while (s->lookahead >= MIN_MATCH) {
- str = s->strstart;
- n = s->lookahead - (MIN_MATCH-1);
- do {
- UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]);
-#ifndef FASTEST
- s->prev[str & s->w_mask] = s->head[s->ins_h];
-#endif
- s->head[s->ins_h] = (Pos)str;
- str++;
- } while (--n);
- s->strstart = str;
- s->lookahead = MIN_MATCH-1;
- fill_window(s);
- }
- s->strstart += s->lookahead;
- s->block_start = (long)s->strstart;
- s->insert = s->lookahead;
- s->lookahead = 0;
- s->match_length = s->prev_length = MIN_MATCH-1;
- s->match_available = 0;
- strm->next_in = next;
- strm->avail_in = avail;
- s->wrap = wrap;
- return Z_OK;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateGetDictionary (strm, dictionary, dictLength)
- z_streamp strm;
- Bytef *dictionary;
- uInt *dictLength;
-{
- deflate_state *s;
- uInt len;
-
- if (deflateStateCheck(strm))
- return Z_STREAM_ERROR;
- s = strm->state;
- len = s->strstart + s->lookahead;
- if (len > s->w_size)
- len = s->w_size;
- if (dictionary != Z_NULL && len)
- zmemcpy(dictionary, s->window + s->strstart + s->lookahead - len, len);
- if (dictLength != Z_NULL)
- *dictLength = len;
- return Z_OK;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateResetKeep (strm)
- z_streamp strm;
-{
- deflate_state *s;
-
- if (deflateStateCheck(strm)) {
- return Z_STREAM_ERROR;
- }
-
- strm->total_in = strm->total_out = 0;
- strm->msg = Z_NULL; /* use zfree if we ever allocate msg dynamically */
- strm->data_type = Z_UNKNOWN;
-
- s = (deflate_state *)strm->state;
- s->pending = 0;
- s->pending_out = s->pending_buf;
-
- if (s->wrap < 0) {
- s->wrap = -s->wrap; /* was made negative by deflate(..., Z_FINISH); */
- }
- s->status =
-#ifdef GZIP
- s->wrap == 2 ? GZIP_STATE :
-#endif
- s->wrap ? INIT_STATE : BUSY_STATE;
- strm->adler =
-#ifdef GZIP
- s->wrap == 2 ? crc32(0L, Z_NULL, 0) :
-#endif
- adler32(0L, Z_NULL, 0);
- s->last_flush = Z_NO_FLUSH;
-
- _tr_init(s);
-
- return Z_OK;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateReset (strm)
- z_streamp strm;
-{
- int ret;
-
- ret = deflateResetKeep(strm);
- if (ret == Z_OK)
- lm_init(strm->state);
- return ret;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateSetHeader (strm, head)
- z_streamp strm;
- gz_headerp head;
-{
- if (deflateStateCheck(strm) || strm->state->wrap != 2)
- return Z_STREAM_ERROR;
- strm->state->gzhead = head;
- return Z_OK;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflatePending (strm, pending, bits)
- unsigned *pending;
- int *bits;
- z_streamp strm;
-{
- if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
- if (pending != Z_NULL)
- *pending = strm->state->pending;
- if (bits != Z_NULL)
- *bits = strm->state->bi_valid;
- return Z_OK;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflatePrime (strm, bits, value)
- z_streamp strm;
- int bits;
- int value;
-{
- deflate_state *s;
- int put;
-
- if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
- s = strm->state;
- if ((Bytef *)(s->d_buf) < s->pending_out + ((Buf_size + 7) >> 3))
- return Z_BUF_ERROR;
- do {
- put = Buf_size - s->bi_valid;
- if (put > bits)
- put = bits;
- s->bi_buf |= (ush)((value & ((1 << put) - 1)) << s->bi_valid);
- s->bi_valid += put;
- _tr_flush_bits(s);
- value >>= put;
- bits -= put;
- } while (bits);
- return Z_OK;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateParams(strm, level, strategy)
- z_streamp strm;
- int level;
- int strategy;
-{
- deflate_state *s;
- compress_func func;
-
- if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
- s = strm->state;
-
-#ifdef FASTEST
- if (level != 0) level = 1;
-#else
- if (level == Z_DEFAULT_COMPRESSION) level = 6;
-#endif
- if (level < 0 || level > 9 || strategy < 0 || strategy > Z_FIXED) {
- return Z_STREAM_ERROR;
- }
- func = configuration_table[s->level].func;
-
- if ((strategy != s->strategy || func != configuration_table[level].func) &&
- s->high_water) {
- /* Flush the last buffer: */
- int err = deflate(strm, Z_BLOCK);
- if (err == Z_STREAM_ERROR)
- return err;
- if (strm->avail_out == 0)
- return Z_BUF_ERROR;
- }
- if (s->level != level) {
- if (s->level == 0 && s->matches != 0) {
- if (s->matches == 1)
- slide_hash(s);
- else
- CLEAR_HASH(s);
- s->matches = 0;
- }
- s->level = level;
- s->max_lazy_match = configuration_table[level].max_lazy;
- s->good_match = configuration_table[level].good_length;
- s->nice_match = configuration_table[level].nice_length;
- s->max_chain_length = configuration_table[level].max_chain;
- }
- s->strategy = strategy;
- return Z_OK;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateTune(strm, good_length, max_lazy, nice_length, max_chain)
- z_streamp strm;
- int good_length;
- int max_lazy;
- int nice_length;
- int max_chain;
-{
- deflate_state *s;
-
- if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
- s = strm->state;
- s->good_match = (uInt)good_length;
- s->max_lazy_match = (uInt)max_lazy;
- s->nice_match = nice_length;
- s->max_chain_length = (uInt)max_chain;
- return Z_OK;
-}
-
-/* =========================================================================
- * For the default windowBits of 15 and memLevel of 8, this function returns
- * a close to exact, as well as small, upper bound on the compressed size.
- * They are coded as constants here for a reason--if the #define's are
- * changed, then this function needs to be changed as well. The return
- * value for 15 and 8 only works for those exact settings.
- *
- * For any setting other than those defaults for windowBits and memLevel,
- * the value returned is a conservative worst case for the maximum expansion
- * resulting from using fixed blocks instead of stored blocks, which deflate
- * can emit on compressed data for some combinations of the parameters.
- *
- * This function could be more sophisticated to provide closer upper bounds for
- * every combination of windowBits and memLevel. But even the conservative
- * upper bound of about 14% expansion does not seem onerous for output buffer
- * allocation.
- */
-uLong ZEXPORT deflateBound(strm, sourceLen)
- z_streamp strm;
- uLong sourceLen;
-{
- deflate_state *s;
- uLong complen, wraplen;
-
- /* conservative upper bound for compressed data */
- complen = sourceLen +
- ((sourceLen + 7) >> 3) + ((sourceLen + 63) >> 6) + 5;
-
- /* if can't get parameters, return conservative bound plus zlib wrapper */
- if (deflateStateCheck(strm))
- return complen + 6;
-
- /* compute wrapper length */
- s = strm->state;
- switch (s->wrap) {
- case 0: /* raw deflate */
- wraplen = 0;
- break;
- case 1: /* zlib wrapper */
- wraplen = 6 + (s->strstart ? 4 : 0);
- break;
-#ifdef GZIP
- case 2: /* gzip wrapper */
- wraplen = 18;
- if (s->gzhead != Z_NULL) { /* user-supplied gzip header */
- Bytef *str;
- if (s->gzhead->extra != Z_NULL)
- wraplen += 2 + s->gzhead->extra_len;
- str = s->gzhead->name;
- if (str != Z_NULL)
- do {
- wraplen++;
- } while (*str++);
- str = s->gzhead->comment;
- if (str != Z_NULL)
- do {
- wraplen++;
- } while (*str++);
- if (s->gzhead->hcrc)
- wraplen += 2;
- }
- break;
-#endif
- default: /* for compiler happiness */
- wraplen = 6;
- }
-
- /* if not default parameters, return conservative bound */
- if (s->w_bits != 15 || s->hash_bits != 8 + 7)
- return complen + wraplen;
-
- /* default settings: return tight bound for that case */
- return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
- (sourceLen >> 25) + 13 - 6 + wraplen;
-}
-
-/* =========================================================================
- * Put a short in the pending buffer. The 16-bit value is put in MSB order.
- * IN assertion: the stream state is correct and there is enough room in
- * pending_buf.
- */
-local void putShortMSB (s, b)
- deflate_state *s;
- uInt b;
-{
- put_byte(s, (Byte)(b >> 8));
- put_byte(s, (Byte)(b & 0xff));
-}
-
-/* =========================================================================
- * Flush as much pending output as possible. All deflate() output, except for
- * some deflate_stored() output, goes through this function so some
- * applications may wish to modify it to avoid allocating a large
- * strm->next_out buffer and copying into it. (See also read_buf()).
- */
-local void flush_pending(strm)
- z_streamp strm;
-{
- unsigned len;
- deflate_state *s = strm->state;
-
- _tr_flush_bits(s);
- len = s->pending;
- if (len > strm->avail_out) len = strm->avail_out;
- if (len == 0) return;
-
- zmemcpy(strm->next_out, s->pending_out, len);
- strm->next_out += len;
- s->pending_out += len;
- strm->total_out += len;
- strm->avail_out -= len;
- s->pending -= len;
- if (s->pending == 0) {
- s->pending_out = s->pending_buf;
- }
-}
-
-/* ===========================================================================
- * Update the header CRC with the bytes s->pending_buf[beg..s->pending - 1].
- */
-#define HCRC_UPDATE(beg) \
- do { \
- if (s->gzhead->hcrc && s->pending > (beg)) \
- strm->adler = crc32(strm->adler, s->pending_buf + (beg), \
- s->pending - (beg)); \
- } while (0)
-
-/* ========================================================================= */
-int ZEXPORT deflate (strm, flush)
- z_streamp strm;
- int flush;
-{
- int old_flush; /* value of flush param for previous deflate call */
- deflate_state *s;
-
- if (deflateStateCheck(strm) || flush > Z_BLOCK || flush < 0) {
- return Z_STREAM_ERROR;
- }
- s = strm->state;
-
- if (strm->next_out == Z_NULL ||
- (strm->avail_in != 0 && strm->next_in == Z_NULL) ||
- (s->status == FINISH_STATE && flush != Z_FINISH)) {
- ERR_RETURN(strm, Z_STREAM_ERROR);
- }
- if (strm->avail_out == 0) ERR_RETURN(strm, Z_BUF_ERROR);
-
- old_flush = s->last_flush;
- s->last_flush = flush;
-
- /* Flush as much pending output as possible */
- if (s->pending != 0) {
- flush_pending(strm);
- if (strm->avail_out == 0) {
- /* Since avail_out is 0, deflate will be called again with
- * more output space, but possibly with both pending and
- * avail_in equal to zero. There won't be anything to do,
- * but this is not an error situation so make sure we
- * return OK instead of BUF_ERROR at next call of deflate:
- */
- s->last_flush = -1;
- return Z_OK;
- }
-
- /* Make sure there is something to do and avoid duplicate consecutive
- * flushes. For repeated and useless calls with Z_FINISH, we keep
- * returning Z_STREAM_END instead of Z_BUF_ERROR.
- */
- } else if (strm->avail_in == 0 && RANK(flush) <= RANK(old_flush) &&
- flush != Z_FINISH) {
- ERR_RETURN(strm, Z_BUF_ERROR);
- }
-
- /* User must not provide more input after the first FINISH: */
- if (s->status == FINISH_STATE && strm->avail_in != 0) {
- ERR_RETURN(strm, Z_BUF_ERROR);
- }
-
- /* Write the header */
- if (s->status == INIT_STATE) {
- /* zlib header */
- uInt header = (Z_DEFLATED + ((s->w_bits-8)<<4)) << 8;
- uInt level_flags;
-
- if (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2)
- level_flags = 0;
- else if (s->level < 6)
- level_flags = 1;
- else if (s->level == 6)
- level_flags = 2;
- else
- level_flags = 3;
- header |= (level_flags << 6);
- if (s->strstart != 0) header |= PRESET_DICT;
- header += 31 - (header % 31);
-
- putShortMSB(s, header);
-
- /* Save the adler32 of the preset dictionary: */
- if (s->strstart != 0) {
- putShortMSB(s, (uInt)(strm->adler >> 16));
- putShortMSB(s, (uInt)(strm->adler & 0xffff));
- }
- strm->adler = adler32(0L, Z_NULL, 0);
- s->status = BUSY_STATE;
-
- /* Compression must start with an empty pending buffer */
- flush_pending(strm);
- if (s->pending != 0) {
- s->last_flush = -1;
- return Z_OK;
- }
- }
-#ifdef GZIP
- if (s->status == GZIP_STATE) {
- /* gzip header */
- strm->adler = crc32(0L, Z_NULL, 0);
- put_byte(s, 31);
- put_byte(s, 139);
- put_byte(s, 8);
- if (s->gzhead == Z_NULL) {
- put_byte(s, 0);
- put_byte(s, 0);
- put_byte(s, 0);
- put_byte(s, 0);
- put_byte(s, 0);
- put_byte(s, s->level == 9 ? 2 :
- (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ?
- 4 : 0));
- put_byte(s, OS_CODE);
- s->status = BUSY_STATE;
-
- /* Compression must start with an empty pending buffer */
- flush_pending(strm);
- if (s->pending != 0) {
- s->last_flush = -1;
- return Z_OK;
- }
- }
- else {
- put_byte(s, (s->gzhead->text ? 1 : 0) +
- (s->gzhead->hcrc ? 2 : 0) +
- (s->gzhead->extra == Z_NULL ? 0 : 4) +
- (s->gzhead->name == Z_NULL ? 0 : 8) +
- (s->gzhead->comment == Z_NULL ? 0 : 16)
- );
- put_byte(s, (Byte)(s->gzhead->time & 0xff));
- put_byte(s, (Byte)((s->gzhead->time >> 8) & 0xff));
- put_byte(s, (Byte)((s->gzhead->time >> 16) & 0xff));
- put_byte(s, (Byte)((s->gzhead->time >> 24) & 0xff));
- put_byte(s, s->level == 9 ? 2 :
- (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ?
- 4 : 0));
- put_byte(s, s->gzhead->os & 0xff);
- if (s->gzhead->extra != Z_NULL) {
- put_byte(s, s->gzhead->extra_len & 0xff);
- put_byte(s, (s->gzhead->extra_len >> 8) & 0xff);
- }
- if (s->gzhead->hcrc)
- strm->adler = crc32(strm->adler, s->pending_buf,
- s->pending);
- s->gzindex = 0;
- s->status = EXTRA_STATE;
- }
- }
- if (s->status == EXTRA_STATE) {
- if (s->gzhead->extra != Z_NULL) {
- ulg beg = s->pending; /* start of bytes to update crc */
- uInt left = (s->gzhead->extra_len & 0xffff) - s->gzindex;
- while (s->pending + left > s->pending_buf_size) {
- uInt copy = s->pending_buf_size - s->pending;
- zmemcpy(s->pending_buf + s->pending,
- s->gzhead->extra + s->gzindex, copy);
- s->pending = s->pending_buf_size;
- HCRC_UPDATE(beg);
- s->gzindex += copy;
- flush_pending(strm);
- if (s->pending != 0) {
- s->last_flush = -1;
- return Z_OK;
- }
- beg = 0;
- left -= copy;
- }
- zmemcpy(s->pending_buf + s->pending,
- s->gzhead->extra + s->gzindex, left);
- s->pending += left;
- HCRC_UPDATE(beg);
- s->gzindex = 0;
- }
- s->status = NAME_STATE;
- }
- if (s->status == NAME_STATE) {
- if (s->gzhead->name != Z_NULL) {
- ulg beg = s->pending; /* start of bytes to update crc */
- int val;
- do {
- if (s->pending == s->pending_buf_size) {
- HCRC_UPDATE(beg);
- flush_pending(strm);
- if (s->pending != 0) {
- s->last_flush = -1;
- return Z_OK;
- }
- beg = 0;
- }
- val = s->gzhead->name[s->gzindex++];
- put_byte(s, val);
- } while (val != 0);
- HCRC_UPDATE(beg);
- s->gzindex = 0;
- }
- s->status = COMMENT_STATE;
- }
- if (s->status == COMMENT_STATE) {
- if (s->gzhead->comment != Z_NULL) {
- ulg beg = s->pending; /* start of bytes to update crc */
- int val;
- do {
- if (s->pending == s->pending_buf_size) {
- HCRC_UPDATE(beg);
- flush_pending(strm);
- if (s->pending != 0) {
- s->last_flush = -1;
- return Z_OK;
- }
- beg = 0;
- }
- val = s->gzhead->comment[s->gzindex++];
- put_byte(s, val);
- } while (val != 0);
- HCRC_UPDATE(beg);
- }
- s->status = HCRC_STATE;
- }
- if (s->status == HCRC_STATE) {
- if (s->gzhead->hcrc) {
- if (s->pending + 2 > s->pending_buf_size) {
- flush_pending(strm);
- if (s->pending != 0) {
- s->last_flush = -1;
- return Z_OK;
- }
- }
- put_byte(s, (Byte)(strm->adler & 0xff));
- put_byte(s, (Byte)((strm->adler >> 8) & 0xff));
- strm->adler = crc32(0L, Z_NULL, 0);
- }
- s->status = BUSY_STATE;
-
- /* Compression must start with an empty pending buffer */
- flush_pending(strm);
- if (s->pending != 0) {
- s->last_flush = -1;
- return Z_OK;
- }
- }
-#endif
-
- /* Start a new block or continue the current one.
- */
- if (strm->avail_in != 0 || s->lookahead != 0 ||
- (flush != Z_NO_FLUSH && s->status != FINISH_STATE)) {
- block_state bstate;
-
- bstate = s->level == 0 ? deflate_stored(s, flush) :
- s->strategy == Z_HUFFMAN_ONLY ? deflate_huff(s, flush) :
- s->strategy == Z_RLE ? deflate_rle(s, flush) :
- (*(configuration_table[s->level].func))(s, flush);
-
- if (bstate == finish_started || bstate == finish_done) {
- s->status = FINISH_STATE;
- }
- if (bstate == need_more || bstate == finish_started) {
- if (strm->avail_out == 0) {
- s->last_flush = -1; /* avoid BUF_ERROR next call, see above */
- }
- return Z_OK;
- /* If flush != Z_NO_FLUSH && avail_out == 0, the next call
- * of deflate should use the same flush parameter to make sure
- * that the flush is complete. So we don't have to output an
- * empty block here, this will be done at next call. This also
- * ensures that for a very small output buffer, we emit at most
- * one empty block.
- */
- }
- if (bstate == block_done) {
- if (flush == Z_PARTIAL_FLUSH) {
- _tr_align(s);
- } else if (flush != Z_BLOCK) { /* FULL_FLUSH or SYNC_FLUSH */
- _tr_stored_block(s, (char*)0, 0L, 0);
- /* For a full flush, this empty block will be recognized
- * as a special marker by inflate_sync().
- */
- if (flush == Z_FULL_FLUSH) {
- CLEAR_HASH(s); /* forget history */
- if (s->lookahead == 0) {
- s->strstart = 0;
- s->block_start = 0L;
- s->insert = 0;
- }
- }
- }
- flush_pending(strm);
- if (strm->avail_out == 0) {
- s->last_flush = -1; /* avoid BUF_ERROR at next call, see above */
- return Z_OK;
- }
- }
- }
-
- if (flush != Z_FINISH) return Z_OK;
- if (s->wrap <= 0) return Z_STREAM_END;
-
- /* Write the trailer */
-#ifdef GZIP
- if (s->wrap == 2) {
- put_byte(s, (Byte)(strm->adler & 0xff));
- put_byte(s, (Byte)((strm->adler >> 8) & 0xff));
- put_byte(s, (Byte)((strm->adler >> 16) & 0xff));
- put_byte(s, (Byte)((strm->adler >> 24) & 0xff));
- put_byte(s, (Byte)(strm->total_in & 0xff));
- put_byte(s, (Byte)((strm->total_in >> 8) & 0xff));
- put_byte(s, (Byte)((strm->total_in >> 16) & 0xff));
- put_byte(s, (Byte)((strm->total_in >> 24) & 0xff));
- }
- else
-#endif
- {
- putShortMSB(s, (uInt)(strm->adler >> 16));
- putShortMSB(s, (uInt)(strm->adler & 0xffff));
- }
- flush_pending(strm);
- /* If avail_out is zero, the application will call deflate again
- * to flush the rest.
- */
- if (s->wrap > 0) s->wrap = -s->wrap; /* write the trailer only once! */
- return s->pending != 0 ? Z_OK : Z_STREAM_END;
-}
-
-/* ========================================================================= */
-int ZEXPORT deflateEnd (strm)
- z_streamp strm;
-{
- int status;
-
- if (deflateStateCheck(strm)) return Z_STREAM_ERROR;
-
- status = strm->state->status;
-
- /* Deallocate in reverse order of allocations: */
- TRY_FREE(strm, strm->state->pending_buf);
- TRY_FREE(strm, strm->state->head);
- TRY_FREE(strm, strm->state->prev);
- TRY_FREE(strm, strm->state->window);
-
- ZFREE(strm, strm->state);
- strm->state = Z_NULL;
-
- return status == BUSY_STATE ? Z_DATA_ERROR : Z_OK;
-}
-
-/* =========================================================================
- * Copy the source state to the destination state.
- * To simplify the source, this is not supported for 16-bit MSDOS (which
- * doesn't have enough memory anyway to duplicate compression states).
- */
-int ZEXPORT deflateCopy (dest, source)
- z_streamp dest;
- z_streamp source;
-{
-#ifdef MAXSEG_64K
- return Z_STREAM_ERROR;
-#else
- deflate_state *ds;
- deflate_state *ss;
- ushf *overlay;
-
-
- if (deflateStateCheck(source) || dest == Z_NULL) {
- return Z_STREAM_ERROR;
- }
-
- ss = source->state;
-
- zmemcpy((voidpf)dest, (voidpf)source, sizeof(z_stream));
-
- ds = (deflate_state *) ZALLOC(dest, 1, sizeof(deflate_state));
- if (ds == Z_NULL) return Z_MEM_ERROR;
- dest->state = (struct internal_state FAR *) ds;
- zmemcpy((voidpf)ds, (voidpf)ss, sizeof(deflate_state));
- ds->strm = dest;
-
- ds->window = (Bytef *) ZALLOC(dest, ds->w_size, 2*sizeof(Byte));
- ds->prev = (Posf *) ZALLOC(dest, ds->w_size, sizeof(Pos));
- ds->head = (Posf *) ZALLOC(dest, ds->hash_size, sizeof(Pos));
- overlay = (ushf *) ZALLOC(dest, ds->lit_bufsize, sizeof(ush)+2);
- ds->pending_buf = (uchf *) overlay;
-
- if (ds->window == Z_NULL || ds->prev == Z_NULL || ds->head == Z_NULL ||
- ds->pending_buf == Z_NULL) {
- deflateEnd (dest);
- return Z_MEM_ERROR;
- }
- /* following zmemcpy do not work for 16-bit MSDOS */
- zmemcpy(ds->window, ss->window, ds->w_size * 2 * sizeof(Byte));
- zmemcpy((voidpf)ds->prev, (voidpf)ss->prev, ds->w_size * sizeof(Pos));
- zmemcpy((voidpf)ds->head, (voidpf)ss->head, ds->hash_size * sizeof(Pos));
- zmemcpy(ds->pending_buf, ss->pending_buf, (uInt)ds->pending_buf_size);
-
- ds->pending_out = ds->pending_buf + (ss->pending_out - ss->pending_buf);
- ds->d_buf = overlay + ds->lit_bufsize/sizeof(ush);
- ds->l_buf = ds->pending_buf + (1+sizeof(ush))*ds->lit_bufsize;
-
- ds->l_desc.dyn_tree = ds->dyn_ltree;
- ds->d_desc.dyn_tree = ds->dyn_dtree;
- ds->bl_desc.dyn_tree = ds->bl_tree;
-
- return Z_OK;
-#endif /* MAXSEG_64K */
-}
-
-/* ===========================================================================
- * Read a new buffer from the current input stream, update the adler32
- * and total number of bytes read. All deflate() input goes through
- * this function so some applications may wish to modify it to avoid
- * allocating a large strm->next_in buffer and copying from it.
- * (See also flush_pending()).
- */
-local unsigned read_buf(strm, buf, size)
- z_streamp strm;
- Bytef *buf;
- unsigned size;
-{
- unsigned len = strm->avail_in;
-
- if (len > size) len = size;
- if (len == 0) return 0;
-
- strm->avail_in -= len;
-
- zmemcpy(buf, strm->next_in, len);
- if (strm->state->wrap == 1) {
- strm->adler = adler32(strm->adler, buf, len);
- }
-#ifdef GZIP
- else if (strm->state->wrap == 2) {
- strm->adler = crc32(strm->adler, buf, len);
- }
-#endif
- strm->next_in += len;
- strm->total_in += len;
-
- return len;
-}
-
-/* ===========================================================================
- * Initialize the "longest match" routines for a new zlib stream
- */
-local void lm_init (s)
- deflate_state *s;
-{
- s->window_size = (ulg)2L*s->w_size;
-
- CLEAR_HASH(s);
-
- /* Set the default configuration parameters:
- */
- s->max_lazy_match = configuration_table[s->level].max_lazy;
- s->good_match = configuration_table[s->level].good_length;
- s->nice_match = configuration_table[s->level].nice_length;
- s->max_chain_length = configuration_table[s->level].max_chain;
-
- s->strstart = 0;
- s->block_start = 0L;
- s->lookahead = 0;
- s->insert = 0;
- s->match_length = s->prev_length = MIN_MATCH-1;
- s->match_available = 0;
- s->ins_h = 0;
-#ifndef FASTEST
-#ifdef ASMV
- match_init(); /* initialize the asm code */
-#endif
-#endif
-}
-
-#ifndef FASTEST
-/* ===========================================================================
- * Set match_start to the longest match starting at the given string and
- * return its length. Matches shorter or equal to prev_length are discarded,
- * in which case the result is equal to prev_length and match_start is
- * garbage.
- * IN assertions: cur_match is the head of the hash chain for the current
- * string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1
- * OUT assertion: the match length is not greater than s->lookahead.
- */
-#ifndef ASMV
-/* For 80x86 and 680x0, an optimized version will be provided in match.asm or
- * match.S. The code will be functionally equivalent.
- */
-local uInt longest_match(s, cur_match)
- deflate_state *s;
- IPos cur_match; /* current match */
-{
- unsigned chain_length = s->max_chain_length;/* max hash chain length */
- register Bytef *scan = s->window + s->strstart; /* current string */
- register Bytef *match; /* matched string */
- register int len; /* length of current match */
- int best_len = (int)s->prev_length; /* best match length so far */
- int nice_match = s->nice_match; /* stop if match long enough */
- IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
- s->strstart - (IPos)MAX_DIST(s) : NIL;
- /* Stop when cur_match becomes <= limit. To simplify the code,
- * we prevent matches with the string of window index 0.
- */
- Posf *prev = s->prev;
- uInt wmask = s->w_mask;
-
-#ifdef UNALIGNED_OK
- /* Compare two bytes at a time. Note: this is not always beneficial.
- * Try with and without -DUNALIGNED_OK to check.
- */
- register Bytef *strend = s->window + s->strstart + MAX_MATCH - 1;
- register ush scan_start = *(ushf*)scan;
- register ush scan_end = *(ushf*)(scan+best_len-1);
-#else
- register Bytef *strend = s->window + s->strstart + MAX_MATCH;
- register Byte scan_end1 = scan[best_len-1];
- register Byte scan_end = scan[best_len];
-#endif
-
- /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
- * It is easy to get rid of this optimization if necessary.
- */
- Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");
-
- /* Do not waste too much time if we already have a good match: */
- if (s->prev_length >= s->good_match) {
- chain_length >>= 2;
- }
- /* Do not look for matches beyond the end of the input. This is necessary
- * to make deflate deterministic.
- */
- if ((uInt)nice_match > s->lookahead) nice_match = (int)s->lookahead;
-
- Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
-
- do {
- Assert(cur_match < s->strstart, "no future");
- match = s->window + cur_match;
-
- /* Skip to next match if the match length cannot increase
- * or if the match length is less than 2. Note that the checks below
- * for insufficient lookahead only occur occasionally for performance
- * reasons. Therefore uninitialized memory will be accessed, and
- * conditional jumps will be made that depend on those values.
- * However the length of the match is limited to the lookahead, so
- * the output of deflate is not affected by the uninitialized values.
- */
-#if (defined(UNALIGNED_OK) && MAX_MATCH == 258)
- /* This code assumes sizeof(unsigned short) == 2. Do not use
- * UNALIGNED_OK if your compiler uses a different size.
- */
- if (*(ushf*)(match+best_len-1) != scan_end ||
- *(ushf*)match != scan_start) continue;
-
- /* It is not necessary to compare scan[2] and match[2] since they are
- * always equal when the other bytes match, given that the hash keys
- * are equal and that HASH_BITS >= 8. Compare 2 bytes at a time at
- * strstart+3, +5, ... up to strstart+257. We check for insufficient
- * lookahead only every 4th comparison; the 128th check will be made
- * at strstart+257. If MAX_MATCH-2 is not a multiple of 8, it is
- * necessary to put more guard bytes at the end of the window, or
- * to check more often for insufficient lookahead.
- */
- Assert(scan[2] == match[2], "scan[2]?");
- scan++, match++;
- do {
- } while (*(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
- *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
- *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
- *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
- scan < strend);
- /* The funny "do {}" generates better code on most compilers */
-
- /* Here, scan <= window+strstart+257 */
- Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
- if (*scan == *match) scan++;
-
- len = (MAX_MATCH - 1) - (int)(strend-scan);
- scan = strend - (MAX_MATCH-1);
-
-#else /* UNALIGNED_OK */
-
- if (match[best_len] != scan_end ||
- match[best_len-1] != scan_end1 ||
- *match != *scan ||
- *++match != scan[1]) continue;
-
- /* The check at best_len-1 can be removed because it will be made
- * again later. (This heuristic is not always a win.)
- * It is not necessary to compare scan[2] and match[2] since they
- * are always equal when the other bytes match, given that
- * the hash keys are equal and that HASH_BITS >= 8.
- */
- scan += 2, match++;
- Assert(*scan == *match, "match[2]?");
-
- /* We check for insufficient lookahead only every 8th comparison;
- * the 256th check will be made at strstart+258.
- */
- do {
- } while (*++scan == *++match && *++scan == *++match &&
- *++scan == *++match && *++scan == *++match &&
- *++scan == *++match && *++scan == *++match &&
- *++scan == *++match && *++scan == *++match &&
- scan < strend);
-
- Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
-
- len = MAX_MATCH - (int)(strend - scan);
- scan = strend - MAX_MATCH;
-
-#endif /* UNALIGNED_OK */
-
- if (len > best_len) {
- s->match_start = cur_match;
- best_len = len;
- if (len >= nice_match) break;
-#ifdef UNALIGNED_OK
- scan_end = *(ushf*)(scan+best_len-1);
-#else
- scan_end1 = scan[best_len-1];
- scan_end = scan[best_len];
-#endif
- }
- } while ((cur_match = prev[cur_match & wmask]) > limit
- && --chain_length != 0);
-
- if ((uInt)best_len <= s->lookahead) return (uInt)best_len;
- return s->lookahead;
-}
-#endif /* ASMV */
-
-#else /* FASTEST */
-
-/* ---------------------------------------------------------------------------
- * Optimized version for FASTEST only
- */
-local uInt longest_match(s, cur_match)
- deflate_state *s;
- IPos cur_match; /* current match */
-{
- register Bytef *scan = s->window + s->strstart; /* current string */
- register Bytef *match; /* matched string */
- register int len; /* length of current match */
- register Bytef *strend = s->window + s->strstart + MAX_MATCH;
-
- /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
- * It is easy to get rid of this optimization if necessary.
- */
- Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");
-
- Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
-
- Assert(cur_match < s->strstart, "no future");
-
- match = s->window + cur_match;
-
- /* Return failure if the match length is less than 2:
- */
- if (match[0] != scan[0] || match[1] != scan[1]) return MIN_MATCH-1;
-
- /* The check at best_len-1 can be removed because it will be made
- * again later. (This heuristic is not always a win.)
- * It is not necessary to compare scan[2] and match[2] since they
- * are always equal when the other bytes match, given that
- * the hash keys are equal and that HASH_BITS >= 8.
- */
- scan += 2, match += 2;
- Assert(*scan == *match, "match[2]?");
-
- /* We check for insufficient lookahead only every 8th comparison;
- * the 256th check will be made at strstart+258.
- */
- do {
- } while (*++scan == *++match && *++scan == *++match &&
- *++scan == *++match && *++scan == *++match &&
- *++scan == *++match && *++scan == *++match &&
- *++scan == *++match && *++scan == *++match &&
- scan < strend);
-
- Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
-
- len = MAX_MATCH - (int)(strend - scan);
-
- if (len < MIN_MATCH) return MIN_MATCH - 1;
-
- s->match_start = cur_match;
- return (uInt)len <= s->lookahead ? (uInt)len : s->lookahead;
-}
-
-#endif /* FASTEST */
-
-#ifdef ZLIB_DEBUG
-
-#define EQUAL 0
-/* result of memcmp for equal strings */
-
-/* ===========================================================================
- * Check that the match at match_start is indeed a match.
- */
-local void check_match(s, start, match, length)
- deflate_state *s;
- IPos start, match;
- int length;
-{
- /* check that the match is indeed a match */
- if (zmemcmp(s->window + match,
- s->window + start, length) != EQUAL) {
- fprintf(stderr, " start %u, match %u, length %d\n",
- start, match, length);
- do {
- fprintf(stderr, "%c%c", s->window[match++], s->window[start++]);
- } while (--length != 0);
- z_error("invalid match");
- }
- if (z_verbose > 1) {
- fprintf(stderr,"\\[%d,%d]", start-match, length);
- do { putc(s->window[start++], stderr); } while (--length != 0);
- }
-}
-#else
-# define check_match(s, start, match, length)
-#endif /* ZLIB_DEBUG */
-
-/* ===========================================================================
- * Fill the window when the lookahead becomes insufficient.
- * Updates strstart and lookahead.
- *
- * IN assertion: lookahead < MIN_LOOKAHEAD
- * OUT assertions: strstart <= window_size-MIN_LOOKAHEAD
- * At least one byte has been read, or avail_in == 0; reads are
- * performed for at least two bytes (required for the zip translate_eol
- * option -- not supported here).
- */
-local void fill_window(s)
- deflate_state *s;
-{
- unsigned n;
- unsigned more; /* Amount of free space at the end of the window. */
- uInt wsize = s->w_size;
-
- Assert(s->lookahead < MIN_LOOKAHEAD, "already enough lookahead");
-
- do {
- more = (unsigned)(s->window_size -(ulg)s->lookahead -(ulg)s->strstart);
-
- /* Deal with !@#$% 64K limit: */
- if (sizeof(int) <= 2) {
- if (more == 0 && s->strstart == 0 && s->lookahead == 0) {
- more = wsize;
-
- } else if (more == (unsigned)(-1)) {
- /* Very unlikely, but possible on 16 bit machine if
- * strstart == 0 && lookahead == 1 (input done a byte at time)
- */
- more--;
- }
- }
-
- /* If the window is almost full and there is insufficient lookahead,
- * move the upper half to the lower one to make room in the upper half.
- */
- if (s->strstart >= wsize+MAX_DIST(s)) {
-
- zmemcpy(s->window, s->window+wsize, (unsigned)wsize - more);
- s->match_start -= wsize;
- s->strstart -= wsize; /* we now have strstart >= MAX_DIST */
- s->block_start -= (long) wsize;
- slide_hash(s);
- more += wsize;
- }
- if (s->strm->avail_in == 0) break;
-
- /* If there was no sliding:
- * strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 &&
- * more == window_size - lookahead - strstart
- * => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1)
- * => more >= window_size - 2*WSIZE + 2
- * In the BIG_MEM or MMAP case (not yet supported),
- * window_size == input_size + MIN_LOOKAHEAD &&
- * strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD.
- * Otherwise, window_size == 2*WSIZE so more >= 2.
- * If there was sliding, more >= WSIZE. So in all cases, more >= 2.
- */
- Assert(more >= 2, "more < 2");
-
- n = read_buf(s->strm, s->window + s->strstart + s->lookahead, more);
- s->lookahead += n;
-
- /* Initialize the hash value now that we have some input: */
- if (s->lookahead + s->insert >= MIN_MATCH) {
- uInt str = s->strstart - s->insert;
- s->ins_h = s->window[str];
- UPDATE_HASH(s, s->ins_h, s->window[str + 1]);
-#if MIN_MATCH != 3
- Call UPDATE_HASH() MIN_MATCH-3 more times
-#endif
- while (s->insert) {
- UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]);
-#ifndef FASTEST
- s->prev[str & s->w_mask] = s->head[s->ins_h];
-#endif
- s->head[s->ins_h] = (Pos)str;
- str++;
- s->insert--;
- if (s->lookahead + s->insert < MIN_MATCH)
- break;
- }
- }
- /* If the whole input has less than MIN_MATCH bytes, ins_h is garbage,
- * but this is not important since only literal bytes will be emitted.
- */
-
- } while (s->lookahead < MIN_LOOKAHEAD && s->strm->avail_in != 0);
-
- /* If the WIN_INIT bytes after the end of the current data have never been
- * written, then zero those bytes in order to avoid memory check reports of
- * the use of uninitialized (or uninitialised as Julian writes) bytes by
- * the longest match routines. Update the high water mark for the next
- * time through here. WIN_INIT is set to MAX_MATCH since the longest match
- * routines allow scanning to strstart + MAX_MATCH, ignoring lookahead.
- */
- if (s->high_water < s->window_size) {
- ulg curr = s->strstart + (ulg)(s->lookahead);
- ulg init;
-
- if (s->high_water < curr) {
- /* Previous high water mark below current data -- zero WIN_INIT
- * bytes or up to end of window, whichever is less.
- */
- init = s->window_size - curr;
- if (init > WIN_INIT)
- init = WIN_INIT;
- zmemzero(s->window + curr, (unsigned)init);
- s->high_water = curr + init;
- }
- else if (s->high_water < (ulg)curr + WIN_INIT) {
- /* High water mark at or above current data, but below current data
- * plus WIN_INIT -- zero out to current data plus WIN_INIT, or up
- * to end of window, whichever is less.
- */
- init = (ulg)curr + WIN_INIT - s->high_water;
- if (init > s->window_size - s->high_water)
- init = s->window_size - s->high_water;
- zmemzero(s->window + s->high_water, (unsigned)init);
- s->high_water += init;
- }
- }
-
- Assert((ulg)s->strstart <= s->window_size - MIN_LOOKAHEAD,
- "not enough room for search");
-}
-
-/* ===========================================================================
- * Flush the current block, with given end-of-file flag.
- * IN assertion: strstart is set to the end of the current match.
- */
-#define FLUSH_BLOCK_ONLY(s, last) { \
- _tr_flush_block(s, (s->block_start >= 0L ? \
- (charf *)&s->window[(unsigned)s->block_start] : \
- (charf *)Z_NULL), \
- (ulg)((long)s->strstart - s->block_start), \
- (last)); \
- s->block_start = s->strstart; \
- flush_pending(s->strm); \
- Tracev((stderr,"[FLUSH]")); \
-}
-
-/* Same but force premature exit if necessary. */
-#define FLUSH_BLOCK(s, last) { \
- FLUSH_BLOCK_ONLY(s, last); \
- if (s->strm->avail_out == 0) return (last) ? finish_started : need_more; \
-}
-
-/* Maximum stored block length in deflate format (not including header). */
-#define MAX_STORED 65535
-
-/* Minimum of a and b. */
-#define MIN(a, b) ((a) > (b) ? (b) : (a))
-
-/* ===========================================================================
- * Copy without compression as much as possible from the input stream, return
- * the current block state.
- *
- * In case deflateParams() is used to later switch to a non-zero compression
- * level, s->matches (otherwise unused when storing) keeps track of the number
- * of hash table slides to perform. If s->matches is 1, then one hash table
- * slide will be done when switching. If s->matches is 2, the maximum value
- * allowed here, then the hash table will be cleared, since two or more slides
- * is the same as a clear.
- *
- * deflate_stored() is written to minimize the number of times an input byte is
- * copied. It is most efficient with large input and output buffers, which
- * maximizes the opportunites to have a single copy from next_in to next_out.
- */
-local block_state deflate_stored(s, flush)
- deflate_state *s;
- int flush;
-{
- /* Smallest worthy block size when not flushing or finishing. By default
- * this is 32K. This can be as small as 507 bytes for memLevel == 1. For
- * large input and output buffers, the stored block size will be larger.
- */
- unsigned min_block = MIN(s->pending_buf_size - 5, s->w_size);
-
- /* Copy as many min_block or larger stored blocks directly to next_out as
- * possible. If flushing, copy the remaining available input to next_out as
- * stored blocks, if there is enough space.
- */
- unsigned len, left, have, last = 0;
- unsigned used = s->strm->avail_in;
- do {
- /* Set len to the maximum size block that we can copy directly with the
- * available input data and output space. Set left to how much of that
- * would be copied from what's left in the window.
- */
- len = MAX_STORED; /* maximum deflate stored block length */
- have = (s->bi_valid + 42) >> 3; /* number of header bytes */
- if (s->strm->avail_out < have) /* need room for header */
- break;
- /* maximum stored block length that will fit in avail_out: */
- have = s->strm->avail_out - have;
- left = s->strstart - s->block_start; /* bytes left in window */
- if (len > (ulg)left + s->strm->avail_in)
- len = left + s->strm->avail_in; /* limit len to the input */
- if (len > have)
- len = have; /* limit len to the output */
-
- /* If the stored block would be less than min_block in length, or if
- * unable to copy all of the available input when flushing, then try
- * copying to the window and the pending buffer instead. Also don't
- * write an empty block when flushing -- deflate() does that.
- */
- if (len < min_block && ((len == 0 && flush != Z_FINISH) ||
- flush == Z_NO_FLUSH ||
- len != left + s->strm->avail_in))
- break;
-
- /* Make a dummy stored block in pending to get the header bytes,
- * including any pending bits. This also updates the debugging counts.
- */
- last = flush == Z_FINISH && len == left + s->strm->avail_in ? 1 : 0;
- _tr_stored_block(s, (char *)0, 0L, last);
-
- /* Replace the lengths in the dummy stored block with len. */
- s->pending_buf[s->pending - 4] = len;
- s->pending_buf[s->pending - 3] = len >> 8;
- s->pending_buf[s->pending - 2] = ~len;
- s->pending_buf[s->pending - 1] = ~len >> 8;
-
- /* Write the stored block header bytes. */
- flush_pending(s->strm);
-
-#ifdef ZLIB_DEBUG
- /* Update debugging counts for the data about to be copied. */
- s->compressed_len += len << 3;
- s->bits_sent += len << 3;
-#endif
-
- /* Copy uncompressed bytes from the window to next_out. */
- if (left) {
- if (left > len)
- left = len;
- zmemcpy(s->strm->next_out, s->window + s->block_start, left);
- s->strm->next_out += left;
- s->strm->avail_out -= left;
- s->strm->total_out += left;
- s->block_start += left;
- len -= left;
- }
-
- /* Copy uncompressed bytes directly from next_in to next_out, updating
- * the check value.
- */
- if (len) {
- read_buf(s->strm, s->strm->next_out, len);
- s->strm->next_out += len;
- s->strm->avail_out -= len;
- s->strm->total_out += len;
- }
- } while (last == 0);
-
- /* Update the sliding window with the last s->w_size bytes of the copied
- * data, or append all of the copied data to the existing window if less
- * than s->w_size bytes were copied. Also update the number of bytes to
- * insert in the hash tables, in the event that deflateParams() switches to
- * a non-zero compression level.
- */
- used -= s->strm->avail_in; /* number of input bytes directly copied */
- if (used) {
- /* If any input was used, then no unused input remains in the window,
- * therefore s->block_start == s->strstart.
- */
- if (used >= s->w_size) { /* supplant the previous history */
- s->matches = 2; /* clear hash */
- zmemcpy(s->window, s->strm->next_in - s->w_size, s->w_size);
- s->strstart = s->w_size;
- }
- else {
- if (s->window_size - s->strstart <= used) {
- /* Slide the window down. */
- s->strstart -= s->w_size;
- zmemcpy(s->window, s->window + s->w_size, s->strstart);
- if (s->matches < 2)
- s->matches++; /* add a pending slide_hash() */
- }
- zmemcpy(s->window + s->strstart, s->strm->next_in - used, used);
- s->strstart += used;
- }
- s->block_start = s->strstart;
- s->insert += MIN(used, s->w_size - s->insert);
- }
- if (s->high_water < s->strstart)
- s->high_water = s->strstart;
-
- /* If the last block was written to next_out, then done. */
- if (last)
- return finish_done;
-
- /* If flushing and all input has been consumed, then done. */
- if (flush != Z_NO_FLUSH && flush != Z_FINISH &&
- s->strm->avail_in == 0 && (long)s->strstart == s->block_start)
- return block_done;
-
- /* Fill the window with any remaining input. */
- have = s->window_size - s->strstart - 1;
- if (s->strm->avail_in > have && s->block_start >= (long)s->w_size) {
- /* Slide the window down. */
- s->block_start -= s->w_size;
- s->strstart -= s->w_size;
- zmemcpy(s->window, s->window + s->w_size, s->strstart);
- if (s->matches < 2)
- s->matches++; /* add a pending slide_hash() */
- have += s->w_size; /* more space now */
- }
- if (have > s->strm->avail_in)
- have = s->strm->avail_in;
- if (have) {
- read_buf(s->strm, s->window + s->strstart, have);
- s->strstart += have;
- }
- if (s->high_water < s->strstart)
- s->high_water = s->strstart;
-
- /* There was not enough avail_out to write a complete worthy or flushed
- * stored block to next_out. Write a stored block to pending instead, if we
- * have enough input for a worthy block, or if flushing and there is enough
- * room for the remaining input as a stored block in the pending buffer.
- */
- have = (s->bi_valid + 42) >> 3; /* number of header bytes */
- /* maximum stored block length that will fit in pending: */
- have = MIN(s->pending_buf_size - have, MAX_STORED);
- min_block = MIN(have, s->w_size);
- left = s->strstart - s->block_start;
- if (left >= min_block ||
- ((left || flush == Z_FINISH) && flush != Z_NO_FLUSH &&
- s->strm->avail_in == 0 && left <= have)) {
- len = MIN(left, have);
- last = flush == Z_FINISH && s->strm->avail_in == 0 &&
- len == left ? 1 : 0;
- _tr_stored_block(s, (charf *)s->window + s->block_start, len, last);
- s->block_start += len;
- flush_pending(s->strm);
- }
-
- /* We've done all we can with the available input and output. */
- return last ? finish_started : need_more;
-}
-
-/* ===========================================================================
- * Compress as much as possible from the input stream, return the current
- * block state.
- * This function does not perform lazy evaluation of matches and inserts
- * new strings in the dictionary only for unmatched strings or for short
- * matches. It is used only for the fast compression options.
- */
-local block_state deflate_fast(s, flush)
- deflate_state *s;
- int flush;
-{
- IPos hash_head; /* head of the hash chain */
- int bflush; /* set if current block must be flushed */
-
- for (;;) {
- /* Make sure that we always have enough lookahead, except
- * at the end of the input file. We need MAX_MATCH bytes
- * for the next match, plus MIN_MATCH bytes to insert the
- * string following the next match.
- */
- if (s->lookahead < MIN_LOOKAHEAD) {
- fill_window(s);
- if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) {
- return need_more;
- }
- if (s->lookahead == 0) break; /* flush the current block */
- }
-
- /* Insert the string window[strstart .. strstart+2] in the
- * dictionary, and set hash_head to the head of the hash chain:
- */
- hash_head = NIL;
- if (s->lookahead >= MIN_MATCH) {
- INSERT_STRING(s, s->strstart, hash_head);
- }
-
- /* Find the longest match, discarding those <= prev_length.
- * At this point we have always match_length < MIN_MATCH
- */
- if (hash_head != NIL && s->strstart - hash_head <= MAX_DIST(s)) {
- /* To simplify the code, we prevent matches with the string
- * of window index 0 (in particular we have to avoid a match
- * of the string with itself at the start of the input file).
- */
- s->match_length = longest_match (s, hash_head);
- /* longest_match() sets match_start */
- }
- if (s->match_length >= MIN_MATCH) {
- check_match(s, s->strstart, s->match_start, s->match_length);
-
- _tr_tally_dist(s, s->strstart - s->match_start,
- s->match_length - MIN_MATCH, bflush);
-
- s->lookahead -= s->match_length;
-
- /* Insert new strings in the hash table only if the match length
- * is not too large. This saves time but degrades compression.
- */
-#ifndef FASTEST
- if (s->match_length <= s->max_insert_length &&
- s->lookahead >= MIN_MATCH) {
- s->match_length--; /* string at strstart already in table */
- do {
- s->strstart++;
- INSERT_STRING(s, s->strstart, hash_head);
- /* strstart never exceeds WSIZE-MAX_MATCH, so there are
- * always MIN_MATCH bytes ahead.
- */
- } while (--s->match_length != 0);
- s->strstart++;
- } else
-#endif
- {
- s->strstart += s->match_length;
- s->match_length = 0;
- s->ins_h = s->window[s->strstart];
- UPDATE_HASH(s, s->ins_h, s->window[s->strstart+1]);
-#if MIN_MATCH != 3
- Call UPDATE_HASH() MIN_MATCH-3 more times
-#endif
- /* If lookahead < MIN_MATCH, ins_h is garbage, but it does not
- * matter since it will be recomputed at next deflate call.
- */
- }
- } else {
- /* No match, output a literal byte */
- Tracevv((stderr,"%c", s->window[s->strstart]));
- _tr_tally_lit (s, s->window[s->strstart], bflush);
- s->lookahead--;
- s->strstart++;
- }
- if (bflush) FLUSH_BLOCK(s, 0);
- }
- s->insert = s->strstart < MIN_MATCH-1 ? s->strstart : MIN_MATCH-1;
- if (flush == Z_FINISH) {
- FLUSH_BLOCK(s, 1);
- return finish_done;
- }
- if (s->last_lit)
- FLUSH_BLOCK(s, 0);
- return block_done;
-}
-
-#ifndef FASTEST
-/* ===========================================================================
- * Same as above, but achieves better compression. We use a lazy
- * evaluation for matches: a match is finally adopted only if there is
- * no better match at the next window position.
- */
-local block_state deflate_slow(s, flush)
- deflate_state *s;
- int flush;
-{
- IPos hash_head; /* head of hash chain */
- int bflush; /* set if current block must be flushed */
-
- /* Process the input block. */
- for (;;) {
- /* Make sure that we always have enough lookahead, except
- * at the end of the input file. We need MAX_MATCH bytes
- * for the next match, plus MIN_MATCH bytes to insert the
- * string following the next match.
- */
- if (s->lookahead < MIN_LOOKAHEAD) {
- fill_window(s);
- if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) {
- return need_more;
- }
- if (s->lookahead == 0) break; /* flush the current block */
- }
-
- /* Insert the string window[strstart .. strstart+2] in the
- * dictionary, and set hash_head to the head of the hash chain:
- */
- hash_head = NIL;
- if (s->lookahead >= MIN_MATCH) {
- INSERT_STRING(s, s->strstart, hash_head);
- }
-
- /* Find the longest match, discarding those <= prev_length.
- */
- s->prev_length = s->match_length, s->prev_match = s->match_start;
- s->match_length = MIN_MATCH-1;
-
- if (hash_head != NIL && s->prev_length < s->max_lazy_match &&
- s->strstart - hash_head <= MAX_DIST(s)) {
- /* To simplify the code, we prevent matches with the string
- * of window index 0 (in particular we have to avoid a match
- * of the string with itself at the start of the input file).
- */
- s->match_length = longest_match (s, hash_head);
- /* longest_match() sets match_start */
-
- if (s->match_length <= 5 && (s->strategy == Z_FILTERED
-#if TOO_FAR <= 32767
- || (s->match_length == MIN_MATCH &&
- s->strstart - s->match_start > TOO_FAR)
-#endif
- )) {
-
- /* If prev_match is also MIN_MATCH, match_start is garbage
- * but we will ignore the current match anyway.
- */
- s->match_length = MIN_MATCH-1;
- }
- }
- /* If there was a match at the previous step and the current
- * match is not better, output the previous match:
- */
- if (s->prev_length >= MIN_MATCH && s->match_length <= s->prev_length) {
- uInt max_insert = s->strstart + s->lookahead - MIN_MATCH;
- /* Do not insert strings in hash table beyond this. */
-
- check_match(s, s->strstart-1, s->prev_match, s->prev_length);
-
- _tr_tally_dist(s, s->strstart -1 - s->prev_match,
- s->prev_length - MIN_MATCH, bflush);
-
- /* Insert in hash table all strings up to the end of the match.
- * strstart-1 and strstart are already inserted. If there is not
- * enough lookahead, the last two strings are not inserted in
- * the hash table.
- */
- s->lookahead -= s->prev_length-1;
- s->prev_length -= 2;
- do {
- if (++s->strstart <= max_insert) {
- INSERT_STRING(s, s->strstart, hash_head);
- }
- } while (--s->prev_length != 0);
- s->match_available = 0;
- s->match_length = MIN_MATCH-1;
- s->strstart++;
-
- if (bflush) FLUSH_BLOCK(s, 0);
-
- } else if (s->match_available) {
- /* If there was no match at the previous position, output a
- * single literal. If there was a match but the current match
- * is longer, truncate the previous match to a single literal.
- */
- Tracevv((stderr,"%c", s->window[s->strstart-1]));
- _tr_tally_lit(s, s->window[s->strstart-1], bflush);
- if (bflush) {
- FLUSH_BLOCK_ONLY(s, 0);
- }
- s->strstart++;
- s->lookahead--;
- if (s->strm->avail_out == 0) return need_more;
- } else {
- /* There is no previous match to compare with, wait for
- * the next step to decide.
- */
- s->match_available = 1;
- s->strstart++;
- s->lookahead--;
- }
- }
- Assert (flush != Z_NO_FLUSH, "no flush?");
- if (s->match_available) {
- Tracevv((stderr,"%c", s->window[s->strstart-1]));
- _tr_tally_lit(s, s->window[s->strstart-1], bflush);
- s->match_available = 0;
- }
- s->insert = s->strstart < MIN_MATCH-1 ? s->strstart : MIN_MATCH-1;
- if (flush == Z_FINISH) {
- FLUSH_BLOCK(s, 1);
- return finish_done;
- }
- if (s->last_lit)
- FLUSH_BLOCK(s, 0);
- return block_done;
-}
-#endif /* FASTEST */
-
-/* ===========================================================================
- * For Z_RLE, simply look for runs of bytes, generate matches only of distance
- * one. Do not maintain a hash table. (It will be regenerated if this run of
- * deflate switches away from Z_RLE.)
- */
-local block_state deflate_rle(s, flush)
- deflate_state *s;
- int flush;
-{
- int bflush; /* set if current block must be flushed */
- uInt prev; /* byte at distance one to match */
- Bytef *scan, *strend; /* scan goes up to strend for length of run */
-
- for (;;) {
- /* Make sure that we always have enough lookahead, except
- * at the end of the input file. We need MAX_MATCH bytes
- * for the longest run, plus one for the unrolled loop.
- */
- if (s->lookahead <= MAX_MATCH) {
- fill_window(s);
- if (s->lookahead <= MAX_MATCH && flush == Z_NO_FLUSH) {
- return need_more;
- }
- if (s->lookahead == 0) break; /* flush the current block */
- }
-
- /* See how many times the previous byte repeats */
- s->match_length = 0;
- if (s->lookahead >= MIN_MATCH && s->strstart > 0) {
- scan = s->window + s->strstart - 1;
- prev = *scan;
- if (prev == *++scan && prev == *++scan && prev == *++scan) {
- strend = s->window + s->strstart + MAX_MATCH;
- do {
- } while (prev == *++scan && prev == *++scan &&
- prev == *++scan && prev == *++scan &&
- prev == *++scan && prev == *++scan &&
- prev == *++scan && prev == *++scan &&
- scan < strend);
- s->match_length = MAX_MATCH - (uInt)(strend - scan);
- if (s->match_length > s->lookahead)
- s->match_length = s->lookahead;
- }
- Assert(scan <= s->window+(uInt)(s->window_size-1), "wild scan");
- }
-
- /* Emit match if have run of MIN_MATCH or longer, else emit literal */
- if (s->match_length >= MIN_MATCH) {
- check_match(s, s->strstart, s->strstart - 1, s->match_length);
-
- _tr_tally_dist(s, 1, s->match_length - MIN_MATCH, bflush);
-
- s->lookahead -= s->match_length;
- s->strstart += s->match_length;
- s->match_length = 0;
- } else {
- /* No match, output a literal byte */
- Tracevv((stderr,"%c", s->window[s->strstart]));
- _tr_tally_lit (s, s->window[s->strstart], bflush);
- s->lookahead--;
- s->strstart++;
- }
- if (bflush) FLUSH_BLOCK(s, 0);
- }
- s->insert = 0;
- if (flush == Z_FINISH) {
- FLUSH_BLOCK(s, 1);
- return finish_done;
- }
- if (s->last_lit)
- FLUSH_BLOCK(s, 0);
- return block_done;
-}
-
-/* ===========================================================================
- * For Z_HUFFMAN_ONLY, do not look for matches. Do not maintain a hash table.
- * (It will be regenerated if this run of deflate switches away from Huffman.)
- */
-local block_state deflate_huff(s, flush)
- deflate_state *s;
- int flush;
-{
- int bflush; /* set if current block must be flushed */
-
- for (;;) {
- /* Make sure that we have a literal to write. */
- if (s->lookahead == 0) {
- fill_window(s);
- if (s->lookahead == 0) {
- if (flush == Z_NO_FLUSH)
- return need_more;
- break; /* flush the current block */
- }
- }
-
- /* Output a literal byte */
- s->match_length = 0;
- Tracevv((stderr,"%c", s->window[s->strstart]));
- _tr_tally_lit (s, s->window[s->strstart], bflush);
- s->lookahead--;
- s->strstart++;
- if (bflush) FLUSH_BLOCK(s, 0);
- }
- s->insert = 0;
- if (flush == Z_FINISH) {
- FLUSH_BLOCK(s, 1);
- return finish_done;
- }
- if (s->last_lit)
- FLUSH_BLOCK(s, 0);
- return block_done;
-}
diff --git a/lib/sqfs/comp/zlib/deflate.h b/lib/sqfs/comp/zlib/deflate.h
deleted file mode 100644
index 23ecdd3..0000000
--- a/lib/sqfs/comp/zlib/deflate.h
+++ /dev/null
@@ -1,349 +0,0 @@
-/* deflate.h -- internal compression state
- * Copyright (C) 1995-2016 Jean-loup Gailly
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* WARNING: this file should *not* be used by applications. It is
- part of the implementation of the compression library and is
- subject to change. Applications should only use zlib.h.
- */
-
-/* @(#) $Id$ */
-
-#ifndef DEFLATE_H
-#define DEFLATE_H
-
-#include "zutil.h"
-
-/* define NO_GZIP when compiling if you want to disable gzip header and
- trailer creation by deflate(). NO_GZIP would be used to avoid linking in
- the crc code when it is not needed. For shared libraries, gzip encoding
- should be left enabled. */
-#ifndef NO_GZIP
-# define GZIP
-#endif
-
-/* ===========================================================================
- * Internal compression state.
- */
-
-#define LENGTH_CODES 29
-/* number of length codes, not counting the special END_BLOCK code */
-
-#define LITERALS 256
-/* number of literal bytes 0..255 */
-
-#define L_CODES (LITERALS+1+LENGTH_CODES)
-/* number of Literal or Length codes, including the END_BLOCK code */
-
-#define D_CODES 30
-/* number of distance codes */
-
-#define BL_CODES 19
-/* number of codes used to transfer the bit lengths */
-
-#define HEAP_SIZE (2*L_CODES+1)
-/* maximum heap size */
-
-#define MAX_BITS 15
-/* All codes must not exceed MAX_BITS bits */
-
-#define Buf_size 16
-/* size of bit buffer in bi_buf */
-
-#define INIT_STATE 42 /* zlib header -> BUSY_STATE */
-#ifdef GZIP
-# define GZIP_STATE 57 /* gzip header -> BUSY_STATE | EXTRA_STATE */
-#endif
-#define EXTRA_STATE 69 /* gzip extra block -> NAME_STATE */
-#define NAME_STATE 73 /* gzip file name -> COMMENT_STATE */
-#define COMMENT_STATE 91 /* gzip comment -> HCRC_STATE */
-#define HCRC_STATE 103 /* gzip header CRC -> BUSY_STATE */
-#define BUSY_STATE 113 /* deflate -> FINISH_STATE */
-#define FINISH_STATE 666 /* stream complete */
-/* Stream status */
-
-
-/* Data structure describing a single value and its code string. */
-typedef struct ct_data_s {
- union {
- ush freq; /* frequency count */
- ush code; /* bit string */
- } fc;
- union {
- ush dad; /* father node in Huffman tree */
- ush len; /* length of bit string */
- } dl;
-} FAR ct_data;
-
-#define Freq fc.freq
-#define Code fc.code
-#define Dad dl.dad
-#define Len dl.len
-
-typedef struct static_tree_desc_s static_tree_desc;
-
-typedef struct tree_desc_s {
- ct_data *dyn_tree; /* the dynamic tree */
- int max_code; /* largest code with non zero frequency */
- const static_tree_desc *stat_desc; /* the corresponding static tree */
-} FAR tree_desc;
-
-typedef ush Pos;
-typedef Pos FAR Posf;
-typedef unsigned IPos;
-
-/* A Pos is an index in the character window. We use short instead of int to
- * save space in the various tables. IPos is used only for parameter passing.
- */
-
-typedef struct internal_state {
- z_streamp strm; /* pointer back to this zlib stream */
- int status; /* as the name implies */
- Bytef *pending_buf; /* output still pending */
- ulg pending_buf_size; /* size of pending_buf */
- Bytef *pending_out; /* next pending byte to output to the stream */
- ulg pending; /* nb of bytes in the pending buffer */
- int wrap; /* bit 0 true for zlib, bit 1 true for gzip */
- gz_headerp gzhead; /* gzip header information to write */
- ulg gzindex; /* where in extra, name, or comment */
- Byte method; /* can only be DEFLATED */
- int last_flush; /* value of flush param for previous deflate call */
-
- /* used by deflate.c: */
-
- uInt w_size; /* LZ77 window size (32K by default) */
- uInt w_bits; /* log2(w_size) (8..16) */
- uInt w_mask; /* w_size - 1 */
-
- Bytef *window;
- /* Sliding window. Input bytes are read into the second half of the window,
- * and move to the first half later to keep a dictionary of at least wSize
- * bytes. With this organization, matches are limited to a distance of
- * wSize-MAX_MATCH bytes, but this ensures that IO is always
- * performed with a length multiple of the block size. Also, it limits
- * the window size to 64K, which is quite useful on MSDOS.
- * To do: use the user input buffer as sliding window.
- */
-
- ulg window_size;
- /* Actual size of window: 2*wSize, except when the user input buffer
- * is directly used as sliding window.
- */
-
- Posf *prev;
- /* Link to older string with same hash index. To limit the size of this
- * array to 64K, this link is maintained only for the last 32K strings.
- * An index in this array is thus a window index modulo 32K.
- */
-
- Posf *head; /* Heads of the hash chains or NIL. */
-
- uInt ins_h; /* hash index of string to be inserted */
- uInt hash_size; /* number of elements in hash table */
- uInt hash_bits; /* log2(hash_size) */
- uInt hash_mask; /* hash_size-1 */
-
- uInt hash_shift;
- /* Number of bits by which ins_h must be shifted at each input
- * step. It must be such that after MIN_MATCH steps, the oldest
- * byte no longer takes part in the hash key, that is:
- * hash_shift * MIN_MATCH >= hash_bits
- */
-
- long block_start;
- /* Window position at the beginning of the current output block. Gets
- * negative when the window is moved backwards.
- */
-
- uInt match_length; /* length of best match */
- IPos prev_match; /* previous match */
- int match_available; /* set if previous match exists */
- uInt strstart; /* start of string to insert */
- uInt match_start; /* start of matching string */
- uInt lookahead; /* number of valid bytes ahead in window */
-
- uInt prev_length;
- /* Length of the best match at previous step. Matches not greater than this
- * are discarded. This is used in the lazy match evaluation.
- */
-
- uInt max_chain_length;
- /* To speed up deflation, hash chains are never searched beyond this
- * length. A higher limit improves compression ratio but degrades the
- * speed.
- */
-
- uInt max_lazy_match;
- /* Attempt to find a better match only when the current match is strictly
- * smaller than this value. This mechanism is used only for compression
- * levels >= 4.
- */
-# define max_insert_length max_lazy_match
- /* Insert new strings in the hash table only if the match length is not
- * greater than this length. This saves time but degrades compression.
- * max_insert_length is used only for compression levels <= 3.
- */
-
- int level; /* compression level (1..9) */
- int strategy; /* favor or force Huffman coding*/
-
- uInt good_match;
- /* Use a faster search when the previous match is longer than this */
-
- int nice_match; /* Stop searching when current match exceeds this */
-
- /* used by trees.c: */
- /* Didn't use ct_data typedef below to suppress compiler warning */
- struct ct_data_s dyn_ltree[HEAP_SIZE]; /* literal and length tree */
- struct ct_data_s dyn_dtree[2*D_CODES+1]; /* distance tree */
- struct ct_data_s bl_tree[2*BL_CODES+1]; /* Huffman tree for bit lengths */
-
- struct tree_desc_s l_desc; /* desc. for literal tree */
- struct tree_desc_s d_desc; /* desc. for distance tree */
- struct tree_desc_s bl_desc; /* desc. for bit length tree */
-
- ush bl_count[MAX_BITS+1];
- /* number of codes at each bit length for an optimal tree */
-
- int heap[2*L_CODES+1]; /* heap used to build the Huffman trees */
- int heap_len; /* number of elements in the heap */
- int heap_max; /* element of largest frequency */
- /* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used.
- * The same heap array is used to build all trees.
- */
-
- uch depth[2*L_CODES+1];
- /* Depth of each subtree used as tie breaker for trees of equal frequency
- */
-
- uchf *l_buf; /* buffer for literals or lengths */
-
- uInt lit_bufsize;
- /* Size of match buffer for literals/lengths. There are 4 reasons for
- * limiting lit_bufsize to 64K:
- * - frequencies can be kept in 16 bit counters
- * - if compression is not successful for the first block, all input
- * data is still in the window so we can still emit a stored block even
- * when input comes from standard input. (This can also be done for
- * all blocks if lit_bufsize is not greater than 32K.)
- * - if compression is not successful for a file smaller than 64K, we can
- * even emit a stored file instead of a stored block (saving 5 bytes).
- * This is applicable only for zip (not gzip or zlib).
- * - creating new Huffman trees less frequently may not provide fast
- * adaptation to changes in the input data statistics. (Take for
- * example a binary file with poorly compressible code followed by
- * a highly compressible string table.) Smaller buffer sizes give
- * fast adaptation but have of course the overhead of transmitting
- * trees more frequently.
- * - I can't count above 4
- */
-
- uInt last_lit; /* running index in l_buf */
-
- ushf *d_buf;
- /* Buffer for distances. To simplify the code, d_buf and l_buf have
- * the same number of elements. To use different lengths, an extra flag
- * array would be necessary.
- */
-
- ulg opt_len; /* bit length of current block with optimal trees */
- ulg static_len; /* bit length of current block with static trees */
- uInt matches; /* number of string matches in current block */
- uInt insert; /* bytes at end of window left to insert */
-
-#ifdef ZLIB_DEBUG
- ulg compressed_len; /* total bit length of compressed file mod 2^32 */
- ulg bits_sent; /* bit length of compressed data sent mod 2^32 */
-#endif
-
- ush bi_buf;
- /* Output buffer. bits are inserted starting at the bottom (least
- * significant bits).
- */
- int bi_valid;
- /* Number of valid bits in bi_buf. All bits above the last valid bit
- * are always zero.
- */
-
- ulg high_water;
- /* High water mark offset in window for initialized bytes -- bytes above
- * this are set to zero in order to avoid memory check warnings when
- * longest match routines access bytes past the input. This is then
- * updated to the new high water mark.
- */
-
-} FAR deflate_state;
-
-/* Output a byte on the stream.
- * IN assertion: there is enough room in pending_buf.
- */
-#define put_byte(s, c) {s->pending_buf[s->pending++] = (Bytef)(c);}
-
-
-#define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
-/* Minimum amount of lookahead, except at the end of the input file.
- * See deflate.c for comments about the MIN_MATCH+1.
- */
-
-#define MAX_DIST(s) ((s)->w_size-MIN_LOOKAHEAD)
-/* In order to simplify the code, particularly on 16 bit machines, match
- * distances are limited to MAX_DIST instead of WSIZE.
- */
-
-#define WIN_INIT MAX_MATCH
-/* Number of bytes after end of data in window to initialize in order to avoid
- memory checker errors from longest match routines */
-
- /* in trees.c */
-void ZLIB_INTERNAL _tr_init OF((deflate_state *s));
-int ZLIB_INTERNAL _tr_tally OF((deflate_state *s, unsigned dist, unsigned lc));
-void ZLIB_INTERNAL _tr_flush_block OF((deflate_state *s, charf *buf,
- ulg stored_len, int last));
-void ZLIB_INTERNAL _tr_flush_bits OF((deflate_state *s));
-void ZLIB_INTERNAL _tr_align OF((deflate_state *s));
-void ZLIB_INTERNAL _tr_stored_block OF((deflate_state *s, charf *buf,
- ulg stored_len, int last));
-
-#define d_code(dist) \
- ((dist) < 256 ? _dist_code[dist] : _dist_code[256+((dist)>>7)])
-/* Mapping from a distance to a distance code. dist is the distance - 1 and
- * must not have side effects. _dist_code[256] and _dist_code[257] are never
- * used.
- */
-
-#ifndef ZLIB_DEBUG
-/* Inline versions of _tr_tally for speed: */
-
-#if defined(GEN_TREES_H) || !defined(STDC)
- extern uch ZLIB_INTERNAL _length_code[];
- extern uch ZLIB_INTERNAL _dist_code[];
-#else
- extern const uch ZLIB_INTERNAL _length_code[];
- extern const uch ZLIB_INTERNAL _dist_code[];
-#endif
-
-# define _tr_tally_lit(s, c, flush) \
- { uch cc = (c); \
- s->d_buf[s->last_lit] = 0; \
- s->l_buf[s->last_lit++] = cc; \
- s->dyn_ltree[cc].Freq++; \
- flush = (s->last_lit == s->lit_bufsize-1); \
- }
-# define _tr_tally_dist(s, distance, length, flush) \
- { uch len = (uch)(length); \
- ush dist = (ush)(distance); \
- s->d_buf[s->last_lit] = dist; \
- s->l_buf[s->last_lit++] = len; \
- dist--; \
- s->dyn_ltree[_length_code[len]+LITERALS+1].Freq++; \
- s->dyn_dtree[d_code(dist)].Freq++; \
- flush = (s->last_lit == s->lit_bufsize-1); \
- }
-#else
-# define _tr_tally_lit(s, c, flush) flush = _tr_tally(s, 0, c)
-# define _tr_tally_dist(s, distance, length, flush) \
- flush = _tr_tally(s, distance, length)
-#endif
-
-#endif /* DEFLATE_H */
diff --git a/lib/sqfs/comp/zlib/inffast.c b/lib/sqfs/comp/zlib/inffast.c
deleted file mode 100644
index 0dbd1db..0000000
--- a/lib/sqfs/comp/zlib/inffast.c
+++ /dev/null
@@ -1,323 +0,0 @@
-/* inffast.c -- fast decoding
- * Copyright (C) 1995-2017 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-#include "zutil.h"
-#include "inftrees.h"
-#include "inflate.h"
-#include "inffast.h"
-
-#ifdef ASMINF
-# pragma message("Assembler code may have bugs -- use at your own risk")
-#else
-
-/*
- Decode literal, length, and distance codes and write out the resulting
- literal and match bytes until either not enough input or output is
- available, an end-of-block is encountered, or a data error is encountered.
- When large enough input and output buffers are supplied to inflate(), for
- example, a 16K input buffer and a 64K output buffer, more than 95% of the
- inflate execution time is spent in this routine.
-
- Entry assumptions:
-
- state->mode == LEN
- strm->avail_in >= 6
- strm->avail_out >= 258
- start >= strm->avail_out
- state->bits < 8
-
- On return, state->mode is one of:
-
- LEN -- ran out of enough output space or enough available input
- TYPE -- reached end of block code, inflate() to interpret next block
- BAD -- error in block data
-
- Notes:
-
- - The maximum input bits used by a length/distance pair is 15 bits for the
- length code, 5 bits for the length extra, 15 bits for the distance code,
- and 13 bits for the distance extra. This totals 48 bits, or six bytes.
- Therefore if strm->avail_in >= 6, then there is enough input to avoid
- checking for available input while decoding.
-
- - The maximum bytes that a single length/distance pair can output is 258
- bytes, which is the maximum length that can be coded. inflate_fast()
- requires strm->avail_out >= 258 for each loop to avoid checking for
- output space.
- */
-void ZLIB_INTERNAL inflate_fast(strm, start)
-z_streamp strm;
-unsigned start; /* inflate()'s starting value for strm->avail_out */
-{
- struct inflate_state FAR *state;
- z_const unsigned char FAR *in; /* local strm->next_in */
- z_const unsigned char FAR *last; /* have enough input while in < last */
- unsigned char FAR *out; /* local strm->next_out */
- unsigned char FAR *beg; /* inflate()'s initial strm->next_out */
- unsigned char FAR *end; /* while out < end, enough space available */
-#ifdef INFLATE_STRICT
- unsigned dmax; /* maximum distance from zlib header */
-#endif
- unsigned wsize; /* window size or zero if not using window */
- unsigned whave; /* valid bytes in the window */
- unsigned wnext; /* window write index */
- unsigned char FAR *window; /* allocated sliding window, if wsize != 0 */
- unsigned long hold; /* local strm->hold */
- unsigned bits; /* local strm->bits */
- code const FAR *lcode; /* local strm->lencode */
- code const FAR *dcode; /* local strm->distcode */
- unsigned lmask; /* mask for first level of length codes */
- unsigned dmask; /* mask for first level of distance codes */
- code here; /* retrieved table entry */
- unsigned op; /* code bits, operation, extra bits, or */
- /* window position, window bytes to copy */
- unsigned len; /* match length, unused bytes */
- unsigned dist; /* match distance */
- unsigned char FAR *from; /* where to copy match from */
-
- /* copy state to local variables */
- state = (struct inflate_state FAR *)strm->state;
- in = strm->next_in;
- last = in + (strm->avail_in - 5);
- out = strm->next_out;
- beg = out - (start - strm->avail_out);
- end = out + (strm->avail_out - 257);
-#ifdef INFLATE_STRICT
- dmax = state->dmax;
-#endif
- wsize = state->wsize;
- whave = state->whave;
- wnext = state->wnext;
- window = state->window;
- hold = state->hold;
- bits = state->bits;
- lcode = state->lencode;
- dcode = state->distcode;
- lmask = (1U << state->lenbits) - 1;
- dmask = (1U << state->distbits) - 1;
-
- /* decode literals and length/distances until end-of-block or not enough
- input data or output space */
- do {
- if (bits < 15) {
- hold += (unsigned long)(*in++) << bits;
- bits += 8;
- hold += (unsigned long)(*in++) << bits;
- bits += 8;
- }
- here = lcode[hold & lmask];
- dolen:
- op = (unsigned)(here.bits);
- hold >>= op;
- bits -= op;
- op = (unsigned)(here.op);
- if (op == 0) { /* literal */
- Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
- "inflate: literal '%c'\n" :
- "inflate: literal 0x%02x\n", here.val));
- *out++ = (unsigned char)(here.val);
- }
- else if (op & 16) { /* length base */
- len = (unsigned)(here.val);
- op &= 15; /* number of extra bits */
- if (op) {
- if (bits < op) {
- hold += (unsigned long)(*in++) << bits;
- bits += 8;
- }
- len += (unsigned)hold & ((1U << op) - 1);
- hold >>= op;
- bits -= op;
- }
- Tracevv((stderr, "inflate: length %u\n", len));
- if (bits < 15) {
- hold += (unsigned long)(*in++) << bits;
- bits += 8;
- hold += (unsigned long)(*in++) << bits;
- bits += 8;
- }
- here = dcode[hold & dmask];
- dodist:
- op = (unsigned)(here.bits);
- hold >>= op;
- bits -= op;
- op = (unsigned)(here.op);
- if (op & 16) { /* distance base */
- dist = (unsigned)(here.val);
- op &= 15; /* number of extra bits */
- if (bits < op) {
- hold += (unsigned long)(*in++) << bits;
- bits += 8;
- if (bits < op) {
- hold += (unsigned long)(*in++) << bits;
- bits += 8;
- }
- }
- dist += (unsigned)hold & ((1U << op) - 1);
-#ifdef INFLATE_STRICT
- if (dist > dmax) {
- strm->msg = (char *)"invalid distance too far back";
- state->mode = BAD;
- break;
- }
-#endif
- hold >>= op;
- bits -= op;
- Tracevv((stderr, "inflate: distance %u\n", dist));
- op = (unsigned)(out - beg); /* max distance in output */
- if (dist > op) { /* see if copy from window */
- op = dist - op; /* distance back in window */
- if (op > whave) {
- if (state->sane) {
- strm->msg =
- (char *)"invalid distance too far back";
- state->mode = BAD;
- break;
- }
-#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
- if (len <= op - whave) {
- do {
- *out++ = 0;
- } while (--len);
- continue;
- }
- len -= op - whave;
- do {
- *out++ = 0;
- } while (--op > whave);
- if (op == 0) {
- from = out - dist;
- do {
- *out++ = *from++;
- } while (--len);
- continue;
- }
-#endif
- }
- from = window;
- if (wnext == 0) { /* very common case */
- from += wsize - op;
- if (op < len) { /* some from window */
- len -= op;
- do {
- *out++ = *from++;
- } while (--op);
- from = out - dist; /* rest from output */
- }
- }
- else if (wnext < op) { /* wrap around window */
- from += wsize + wnext - op;
- op -= wnext;
- if (op < len) { /* some from end of window */
- len -= op;
- do {
- *out++ = *from++;
- } while (--op);
- from = window;
- if (wnext < len) { /* some from start of window */
- op = wnext;
- len -= op;
- do {
- *out++ = *from++;
- } while (--op);
- from = out - dist; /* rest from output */
- }
- }
- }
- else { /* contiguous in window */
- from += wnext - op;
- if (op < len) { /* some from window */
- len -= op;
- do {
- *out++ = *from++;
- } while (--op);
- from = out - dist; /* rest from output */
- }
- }
- while (len > 2) {
- *out++ = *from++;
- *out++ = *from++;
- *out++ = *from++;
- len -= 3;
- }
- if (len) {
- *out++ = *from++;
- if (len > 1)
- *out++ = *from++;
- }
- }
- else {
- from = out - dist; /* copy direct from output */
- do { /* minimum length is three */
- *out++ = *from++;
- *out++ = *from++;
- *out++ = *from++;
- len -= 3;
- } while (len > 2);
- if (len) {
- *out++ = *from++;
- if (len > 1)
- *out++ = *from++;
- }
- }
- }
- else if ((op & 64) == 0) { /* 2nd level distance code */
- here = dcode[here.val + (hold & ((1U << op) - 1))];
- goto dodist;
- }
- else {
- strm->msg = (char *)"invalid distance code";
- state->mode = BAD;
- break;
- }
- }
- else if ((op & 64) == 0) { /* 2nd level length code */
- here = lcode[here.val + (hold & ((1U << op) - 1))];
- goto dolen;
- }
- else if (op & 32) { /* end-of-block */
- Tracevv((stderr, "inflate: end of block\n"));
- state->mode = TYPE;
- break;
- }
- else {
- strm->msg = (char *)"invalid literal/length code";
- state->mode = BAD;
- break;
- }
- } while (in < last && out < end);
-
- /* return unused bytes (on entry, bits < 8, so in won't go too far back) */
- len = bits >> 3;
- in -= len;
- bits -= len << 3;
- hold &= (1U << bits) - 1;
-
- /* update state and return */
- strm->next_in = in;
- strm->next_out = out;
- strm->avail_in = (unsigned)(in < last ? 5 + (last - in) : 5 - (in - last));
- strm->avail_out = (unsigned)(out < end ?
- 257 + (end - out) : 257 - (out - end));
- state->hold = hold;
- state->bits = bits;
- return;
-}
-
-/*
- inflate_fast() speedups that turned out slower (on a PowerPC G3 750CXe):
- - Using bit fields for code structure
- - Different op definition to avoid & for extra bits (do & for table bits)
- - Three separate decoding do-loops for direct, window, and wnext == 0
- - Special case for distance > 1 copies to do overlapped load and store copy
- - Explicit branch predictions (based on measured branch probabilities)
- - Deferring match copy and interspersed it with decoding subsequent codes
- - Swapping literal/length else
- - Swapping window/direct else
- - Larger unrolled copy loops (three is about right)
- - Moving len -= 3 statement into middle of loop
- */
-
-#endif /* !ASMINF */
diff --git a/lib/sqfs/comp/zlib/inffast.h b/lib/sqfs/comp/zlib/inffast.h
deleted file mode 100644
index e5c1aa4..0000000
--- a/lib/sqfs/comp/zlib/inffast.h
+++ /dev/null
@@ -1,11 +0,0 @@
-/* inffast.h -- header to use inffast.c
- * Copyright (C) 1995-2003, 2010 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* WARNING: this file should *not* be used by applications. It is
- part of the implementation of the compression library and is
- subject to change. Applications should only use zlib.h.
- */
-
-void ZLIB_INTERNAL inflate_fast OF((z_streamp strm, unsigned start));
diff --git a/lib/sqfs/comp/zlib/inffixed.h b/lib/sqfs/comp/zlib/inffixed.h
deleted file mode 100644
index d628327..0000000
--- a/lib/sqfs/comp/zlib/inffixed.h
+++ /dev/null
@@ -1,94 +0,0 @@
- /* inffixed.h -- table for decoding fixed codes
- * Generated automatically by makefixed().
- */
-
- /* WARNING: this file should *not* be used by applications.
- It is part of the implementation of this library and is
- subject to change. Applications should only use zlib.h.
- */
-
- static const code lenfix[512] = {
- {96,7,0},{0,8,80},{0,8,16},{20,8,115},{18,7,31},{0,8,112},{0,8,48},
- {0,9,192},{16,7,10},{0,8,96},{0,8,32},{0,9,160},{0,8,0},{0,8,128},
- {0,8,64},{0,9,224},{16,7,6},{0,8,88},{0,8,24},{0,9,144},{19,7,59},
- {0,8,120},{0,8,56},{0,9,208},{17,7,17},{0,8,104},{0,8,40},{0,9,176},
- {0,8,8},{0,8,136},{0,8,72},{0,9,240},{16,7,4},{0,8,84},{0,8,20},
- {21,8,227},{19,7,43},{0,8,116},{0,8,52},{0,9,200},{17,7,13},{0,8,100},
- {0,8,36},{0,9,168},{0,8,4},{0,8,132},{0,8,68},{0,9,232},{16,7,8},
- {0,8,92},{0,8,28},{0,9,152},{20,7,83},{0,8,124},{0,8,60},{0,9,216},
- {18,7,23},{0,8,108},{0,8,44},{0,9,184},{0,8,12},{0,8,140},{0,8,76},
- {0,9,248},{16,7,3},{0,8,82},{0,8,18},{21,8,163},{19,7,35},{0,8,114},
- {0,8,50},{0,9,196},{17,7,11},{0,8,98},{0,8,34},{0,9,164},{0,8,2},
- {0,8,130},{0,8,66},{0,9,228},{16,7,7},{0,8,90},{0,8,26},{0,9,148},
- {20,7,67},{0,8,122},{0,8,58},{0,9,212},{18,7,19},{0,8,106},{0,8,42},
- {0,9,180},{0,8,10},{0,8,138},{0,8,74},{0,9,244},{16,7,5},{0,8,86},
- {0,8,22},{64,8,0},{19,7,51},{0,8,118},{0,8,54},{0,9,204},{17,7,15},
- {0,8,102},{0,8,38},{0,9,172},{0,8,6},{0,8,134},{0,8,70},{0,9,236},
- {16,7,9},{0,8,94},{0,8,30},{0,9,156},{20,7,99},{0,8,126},{0,8,62},
- {0,9,220},{18,7,27},{0,8,110},{0,8,46},{0,9,188},{0,8,14},{0,8,142},
- {0,8,78},{0,9,252},{96,7,0},{0,8,81},{0,8,17},{21,8,131},{18,7,31},
- {0,8,113},{0,8,49},{0,9,194},{16,7,10},{0,8,97},{0,8,33},{0,9,162},
- {0,8,1},{0,8,129},{0,8,65},{0,9,226},{16,7,6},{0,8,89},{0,8,25},
- {0,9,146},{19,7,59},{0,8,121},{0,8,57},{0,9,210},{17,7,17},{0,8,105},
- {0,8,41},{0,9,178},{0,8,9},{0,8,137},{0,8,73},{0,9,242},{16,7,4},
- {0,8,85},{0,8,21},{16,8,258},{19,7,43},{0,8,117},{0,8,53},{0,9,202},
- {17,7,13},{0,8,101},{0,8,37},{0,9,170},{0,8,5},{0,8,133},{0,8,69},
- {0,9,234},{16,7,8},{0,8,93},{0,8,29},{0,9,154},{20,7,83},{0,8,125},
- {0,8,61},{0,9,218},{18,7,23},{0,8,109},{0,8,45},{0,9,186},{0,8,13},
- {0,8,141},{0,8,77},{0,9,250},{16,7,3},{0,8,83},{0,8,19},{21,8,195},
- {19,7,35},{0,8,115},{0,8,51},{0,9,198},{17,7,11},{0,8,99},{0,8,35},
- {0,9,166},{0,8,3},{0,8,131},{0,8,67},{0,9,230},{16,7,7},{0,8,91},
- {0,8,27},{0,9,150},{20,7,67},{0,8,123},{0,8,59},{0,9,214},{18,7,19},
- {0,8,107},{0,8,43},{0,9,182},{0,8,11},{0,8,139},{0,8,75},{0,9,246},
- {16,7,5},{0,8,87},{0,8,23},{64,8,0},{19,7,51},{0,8,119},{0,8,55},
- {0,9,206},{17,7,15},{0,8,103},{0,8,39},{0,9,174},{0,8,7},{0,8,135},
- {0,8,71},{0,9,238},{16,7,9},{0,8,95},{0,8,31},{0,9,158},{20,7,99},
- {0,8,127},{0,8,63},{0,9,222},{18,7,27},{0,8,111},{0,8,47},{0,9,190},
- {0,8,15},{0,8,143},{0,8,79},{0,9,254},{96,7,0},{0,8,80},{0,8,16},
- {20,8,115},{18,7,31},{0,8,112},{0,8,48},{0,9,193},{16,7,10},{0,8,96},
- {0,8,32},{0,9,161},{0,8,0},{0,8,128},{0,8,64},{0,9,225},{16,7,6},
- {0,8,88},{0,8,24},{0,9,145},{19,7,59},{0,8,120},{0,8,56},{0,9,209},
- {17,7,17},{0,8,104},{0,8,40},{0,9,177},{0,8,8},{0,8,136},{0,8,72},
- {0,9,241},{16,7,4},{0,8,84},{0,8,20},{21,8,227},{19,7,43},{0,8,116},
- {0,8,52},{0,9,201},{17,7,13},{0,8,100},{0,8,36},{0,9,169},{0,8,4},
- {0,8,132},{0,8,68},{0,9,233},{16,7,8},{0,8,92},{0,8,28},{0,9,153},
- {20,7,83},{0,8,124},{0,8,60},{0,9,217},{18,7,23},{0,8,108},{0,8,44},
- {0,9,185},{0,8,12},{0,8,140},{0,8,76},{0,9,249},{16,7,3},{0,8,82},
- {0,8,18},{21,8,163},{19,7,35},{0,8,114},{0,8,50},{0,9,197},{17,7,11},
- {0,8,98},{0,8,34},{0,9,165},{0,8,2},{0,8,130},{0,8,66},{0,9,229},
- {16,7,7},{0,8,90},{0,8,26},{0,9,149},{20,7,67},{0,8,122},{0,8,58},
- {0,9,213},{18,7,19},{0,8,106},{0,8,42},{0,9,181},{0,8,10},{0,8,138},
- {0,8,74},{0,9,245},{16,7,5},{0,8,86},{0,8,22},{64,8,0},{19,7,51},
- {0,8,118},{0,8,54},{0,9,205},{17,7,15},{0,8,102},{0,8,38},{0,9,173},
- {0,8,6},{0,8,134},{0,8,70},{0,9,237},{16,7,9},{0,8,94},{0,8,30},
- {0,9,157},{20,7,99},{0,8,126},{0,8,62},{0,9,221},{18,7,27},{0,8,110},
- {0,8,46},{0,9,189},{0,8,14},{0,8,142},{0,8,78},{0,9,253},{96,7,0},
- {0,8,81},{0,8,17},{21,8,131},{18,7,31},{0,8,113},{0,8,49},{0,9,195},
- {16,7,10},{0,8,97},{0,8,33},{0,9,163},{0,8,1},{0,8,129},{0,8,65},
- {0,9,227},{16,7,6},{0,8,89},{0,8,25},{0,9,147},{19,7,59},{0,8,121},
- {0,8,57},{0,9,211},{17,7,17},{0,8,105},{0,8,41},{0,9,179},{0,8,9},
- {0,8,137},{0,8,73},{0,9,243},{16,7,4},{0,8,85},{0,8,21},{16,8,258},
- {19,7,43},{0,8,117},{0,8,53},{0,9,203},{17,7,13},{0,8,101},{0,8,37},
- {0,9,171},{0,8,5},{0,8,133},{0,8,69},{0,9,235},{16,7,8},{0,8,93},
- {0,8,29},{0,9,155},{20,7,83},{0,8,125},{0,8,61},{0,9,219},{18,7,23},
- {0,8,109},{0,8,45},{0,9,187},{0,8,13},{0,8,141},{0,8,77},{0,9,251},
- {16,7,3},{0,8,83},{0,8,19},{21,8,195},{19,7,35},{0,8,115},{0,8,51},
- {0,9,199},{17,7,11},{0,8,99},{0,8,35},{0,9,167},{0,8,3},{0,8,131},
- {0,8,67},{0,9,231},{16,7,7},{0,8,91},{0,8,27},{0,9,151},{20,7,67},
- {0,8,123},{0,8,59},{0,9,215},{18,7,19},{0,8,107},{0,8,43},{0,9,183},
- {0,8,11},{0,8,139},{0,8,75},{0,9,247},{16,7,5},{0,8,87},{0,8,23},
- {64,8,0},{19,7,51},{0,8,119},{0,8,55},{0,9,207},{17,7,15},{0,8,103},
- {0,8,39},{0,9,175},{0,8,7},{0,8,135},{0,8,71},{0,9,239},{16,7,9},
- {0,8,95},{0,8,31},{0,9,159},{20,7,99},{0,8,127},{0,8,63},{0,9,223},
- {18,7,27},{0,8,111},{0,8,47},{0,9,191},{0,8,15},{0,8,143},{0,8,79},
- {0,9,255}
- };
-
- static const code distfix[32] = {
- {16,5,1},{23,5,257},{19,5,17},{27,5,4097},{17,5,5},{25,5,1025},
- {21,5,65},{29,5,16385},{16,5,3},{24,5,513},{20,5,33},{28,5,8193},
- {18,5,9},{26,5,2049},{22,5,129},{64,5,0},{16,5,2},{23,5,385},
- {19,5,25},{27,5,6145},{17,5,7},{25,5,1537},{21,5,97},{29,5,24577},
- {16,5,4},{24,5,769},{20,5,49},{28,5,12289},{18,5,13},{26,5,3073},
- {22,5,193},{64,5,0}
- };
diff --git a/lib/sqfs/comp/zlib/inflate.c b/lib/sqfs/comp/zlib/inflate.c
deleted file mode 100644
index 066ab9f..0000000
--- a/lib/sqfs/comp/zlib/inflate.c
+++ /dev/null
@@ -1,1582 +0,0 @@
-/* inflate.c -- zlib decompression
- * Copyright (C) 1995-2016 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/*
- * Change history:
- *
- * 1.2.beta0 24 Nov 2002
- * - First version -- complete rewrite of inflate to simplify code, avoid
- * creation of window when not needed, minimize use of window when it is
- * needed, make inffast.c even faster, implement gzip decoding, and to
- * improve code readability and style over the previous zlib inflate code
- *
- * 1.2.beta1 25 Nov 2002
- * - Use pointers for available input and output checking in inffast.c
- * - Remove input and output counters in inffast.c
- * - Change inffast.c entry and loop from avail_in >= 7 to >= 6
- * - Remove unnecessary second byte pull from length extra in inffast.c
- * - Unroll direct copy to three copies per loop in inffast.c
- *
- * 1.2.beta2 4 Dec 2002
- * - Change external routine names to reduce potential conflicts
- * - Correct filename to inffixed.h for fixed tables in inflate.c
- * - Make hbuf[] unsigned char to match parameter type in inflate.c
- * - Change strm->next_out[-state->offset] to *(strm->next_out - state->offset)
- * to avoid negation problem on Alphas (64 bit) in inflate.c
- *
- * 1.2.beta3 22 Dec 2002
- * - Add comments on state->bits assertion in inffast.c
- * - Add comments on op field in inftrees.h
- * - Fix bug in reuse of allocated window after inflateReset()
- * - Remove bit fields--back to byte structure for speed
- * - Remove distance extra == 0 check in inflate_fast()--only helps for lengths
- * - Change post-increments to pre-increments in inflate_fast(), PPC biased?
- * - Add compile time option, POSTINC, to use post-increments instead (Intel?)
- * - Make MATCH copy in inflate() much faster for when inflate_fast() not used
- * - Use local copies of stream next and avail values, as well as local bit
- * buffer and bit count in inflate()--for speed when inflate_fast() not used
- *
- * 1.2.beta4 1 Jan 2003
- * - Split ptr - 257 statements in inflate_table() to avoid compiler warnings
- * - Move a comment on output buffer sizes from inffast.c to inflate.c
- * - Add comments in inffast.c to introduce the inflate_fast() routine
- * - Rearrange window copies in inflate_fast() for speed and simplification
- * - Unroll last copy for window match in inflate_fast()
- * - Use local copies of window variables in inflate_fast() for speed
- * - Pull out common wnext == 0 case for speed in inflate_fast()
- * - Make op and len in inflate_fast() unsigned for consistency
- * - Add FAR to lcode and dcode declarations in inflate_fast()
- * - Simplified bad distance check in inflate_fast()
- * - Added inflateBackInit(), inflateBack(), and inflateBackEnd() in new
- * source file infback.c to provide a call-back interface to inflate for
- * programs like gzip and unzip -- uses window as output buffer to avoid
- * window copying
- *
- * 1.2.beta5 1 Jan 2003
- * - Improved inflateBack() interface to allow the caller to provide initial
- * input in strm.
- * - Fixed stored blocks bug in inflateBack()
- *
- * 1.2.beta6 4 Jan 2003
- * - Added comments in inffast.c on effectiveness of POSTINC
- * - Typecasting all around to reduce compiler warnings
- * - Changed loops from while (1) or do {} while (1) to for (;;), again to
- * make compilers happy
- * - Changed type of window in inflateBackInit() to unsigned char *
- *
- * 1.2.beta7 27 Jan 2003
- * - Changed many types to unsigned or unsigned short to avoid warnings
- * - Added inflateCopy() function
- *
- * 1.2.0 9 Mar 2003
- * - Changed inflateBack() interface to provide separate opaque descriptors
- * for the in() and out() functions
- * - Changed inflateBack() argument and in_func typedef to swap the length
- * and buffer address return values for the input function
- * - Check next_in and next_out for Z_NULL on entry to inflate()
- *
- * The history for versions after 1.2.0 are in ChangeLog in zlib distribution.
- */
-
-#include "zutil.h"
-#include "inftrees.h"
-#include "inflate.h"
-#include "inffast.h"
-
-#ifdef MAKEFIXED
-# ifndef BUILDFIXED
-# define BUILDFIXED
-# endif
-#endif
-
-/* function prototypes */
-local int inflateStateCheck OF((z_streamp strm));
-local void fixedtables OF((struct inflate_state FAR *state));
-local int updatewindow OF((z_streamp strm, const unsigned char FAR *end,
- unsigned copy));
-#ifdef BUILDFIXED
- void makefixed OF((void));
-#endif
-local unsigned syncsearch OF((unsigned FAR *have, const unsigned char FAR *buf,
- unsigned len));
-
-local int inflateStateCheck(strm)
-z_streamp strm;
-{
- struct inflate_state FAR *state;
- if (strm == Z_NULL ||
- strm->zalloc == (alloc_func)0 || strm->zfree == (free_func)0)
- return 1;
- state = (struct inflate_state FAR *)strm->state;
- if (state == Z_NULL || state->strm != strm ||
- state->mode < HEAD || state->mode > SYNC)
- return 1;
- return 0;
-}
-
-int ZEXPORT inflateResetKeep(strm)
-z_streamp strm;
-{
- struct inflate_state FAR *state;
-
- if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
- state = (struct inflate_state FAR *)strm->state;
- strm->total_in = strm->total_out = state->total = 0;
- strm->msg = Z_NULL;
- if (state->wrap) /* to support ill-conceived Java test suite */
- strm->adler = state->wrap & 1;
- state->mode = HEAD;
- state->last = 0;
- state->havedict = 0;
- state->dmax = 32768U;
- state->head = Z_NULL;
- state->hold = 0;
- state->bits = 0;
- state->lencode = state->distcode = state->next = state->codes;
- state->sane = 1;
- state->back = -1;
- Tracev((stderr, "inflate: reset\n"));
- return Z_OK;
-}
-
-int ZEXPORT inflateReset(strm)
-z_streamp strm;
-{
- struct inflate_state FAR *state;
-
- if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
- state = (struct inflate_state FAR *)strm->state;
- state->wsize = 0;
- state->whave = 0;
- state->wnext = 0;
- return inflateResetKeep(strm);
-}
-
-int ZEXPORT inflateReset2(strm, windowBits)
-z_streamp strm;
-int windowBits;
-{
- int wrap;
- struct inflate_state FAR *state;
-
- /* get the state */
- if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
- state = (struct inflate_state FAR *)strm->state;
-
- /* extract wrap request from windowBits parameter */
- if (windowBits < 0) {
- wrap = 0;
- windowBits = -windowBits;
- }
- else {
- wrap = (windowBits >> 4) + 5;
-#ifdef GUNZIP
- if (windowBits < 48)
- windowBits &= 15;
-#endif
- }
-
- /* set number of window bits, free window if different */
- if (windowBits && (windowBits < 8 || windowBits > 15))
- return Z_STREAM_ERROR;
- if (state->window != Z_NULL && state->wbits != (unsigned)windowBits) {
- ZFREE(strm, state->window);
- state->window = Z_NULL;
- }
-
- /* update state and reset the rest of it */
- state->wrap = wrap;
- state->wbits = (unsigned)windowBits;
- return inflateReset(strm);
-}
-
-int ZEXPORT inflateInit2_(strm, windowBits, version, stream_size)
-z_streamp strm;
-int windowBits;
-const char *version;
-int stream_size;
-{
- int ret;
- struct inflate_state FAR *state;
-
- if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
- stream_size != (int)(sizeof(z_stream)))
- return Z_VERSION_ERROR;
- if (strm == Z_NULL) return Z_STREAM_ERROR;
- strm->msg = Z_NULL; /* in case we return an error */
- if (strm->zalloc == (alloc_func)0) {
-#ifdef Z_SOLO
- return Z_STREAM_ERROR;
-#else
- strm->zalloc = zcalloc;
- strm->opaque = (voidpf)0;
-#endif
- }
- if (strm->zfree == (free_func)0)
-#ifdef Z_SOLO
- return Z_STREAM_ERROR;
-#else
- strm->zfree = zcfree;
-#endif
- state = (struct inflate_state FAR *)
- ZALLOC(strm, 1, sizeof(struct inflate_state));
- if (state == Z_NULL) return Z_MEM_ERROR;
- Tracev((stderr, "inflate: allocated\n"));
- strm->state = (struct internal_state FAR *)state;
- state->strm = strm;
- state->window = Z_NULL;
- state->mode = HEAD; /* to pass state test in inflateReset2() */
- ret = inflateReset2(strm, windowBits);
- if (ret != Z_OK) {
- ZFREE(strm, state);
- strm->state = Z_NULL;
- }
- return ret;
-}
-
-int ZEXPORT inflateInit_(strm, version, stream_size)
-z_streamp strm;
-const char *version;
-int stream_size;
-{
- return inflateInit2_(strm, DEF_WBITS, version, stream_size);
-}
-
-int ZEXPORT inflatePrime(strm, bits, value)
-z_streamp strm;
-int bits;
-int value;
-{
- struct inflate_state FAR *state;
-
- if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
- state = (struct inflate_state FAR *)strm->state;
- if (bits < 0) {
- state->hold = 0;
- state->bits = 0;
- return Z_OK;
- }
- if (bits > 16 || state->bits + (uInt)bits > 32) return Z_STREAM_ERROR;
- value &= (1L << bits) - 1;
- state->hold += (unsigned)value << state->bits;
- state->bits += (uInt)bits;
- return Z_OK;
-}
-
-/*
- Return state with length and distance decoding tables and index sizes set to
- fixed code decoding. Normally this returns fixed tables from inffixed.h.
- If BUILDFIXED is defined, then instead this routine builds the tables the
- first time it's called, and returns those tables the first time and
- thereafter. This reduces the size of the code by about 2K bytes, in
- exchange for a little execution time. However, BUILDFIXED should not be
- used for threaded applications, since the rewriting of the tables and virgin
- may not be thread-safe.
- */
-local void fixedtables(state)
-struct inflate_state FAR *state;
-{
-#ifdef BUILDFIXED
- static int virgin = 1;
- static code *lenfix, *distfix;
- static code fixed[544];
-
- /* build fixed huffman tables if first call (may not be thread safe) */
- if (virgin) {
- unsigned sym, bits;
- static code *next;
-
- /* literal/length table */
- sym = 0;
- while (sym < 144) state->lens[sym++] = 8;
- while (sym < 256) state->lens[sym++] = 9;
- while (sym < 280) state->lens[sym++] = 7;
- while (sym < 288) state->lens[sym++] = 8;
- next = fixed;
- lenfix = next;
- bits = 9;
- inflate_table(LENS, state->lens, 288, &(next), &(bits), state->work);
-
- /* distance table */
- sym = 0;
- while (sym < 32) state->lens[sym++] = 5;
- distfix = next;
- bits = 5;
- inflate_table(DISTS, state->lens, 32, &(next), &(bits), state->work);
-
- /* do this just once */
- virgin = 0;
- }
-#else /* !BUILDFIXED */
-# include "inffixed.h"
-#endif /* BUILDFIXED */
- state->lencode = lenfix;
- state->lenbits = 9;
- state->distcode = distfix;
- state->distbits = 5;
-}
-
-#ifdef MAKEFIXED
-#include <stdio.h>
-
-/*
- Write out the inffixed.h that is #include'd above. Defining MAKEFIXED also
- defines BUILDFIXED, so the tables are built on the fly. makefixed() writes
- those tables to stdout, which would be piped to inffixed.h. A small program
- can simply call makefixed to do this:
-
- void makefixed(void);
-
- int main(void)
- {
- makefixed();
- return 0;
- }
-
- Then that can be linked with zlib built with MAKEFIXED defined and run:
-
- a.out > inffixed.h
- */
-void makefixed()
-{
- unsigned low, size;
- struct inflate_state state;
-
- fixedtables(&state);
- puts(" /* inffixed.h -- table for decoding fixed codes");
- puts(" * Generated automatically by makefixed().");
- puts(" */");
- puts("");
- puts(" /* WARNING: this file should *not* be used by applications.");
- puts(" It is part of the implementation of this library and is");
- puts(" subject to change. Applications should only use zlib.h.");
- puts(" */");
- puts("");
- size = 1U << 9;
- printf(" static const code lenfix[%u] = {", size);
- low = 0;
- for (;;) {
- if ((low % 7) == 0) printf("\n ");
- printf("{%u,%u,%d}", (low & 127) == 99 ? 64 : state.lencode[low].op,
- state.lencode[low].bits, state.lencode[low].val);
- if (++low == size) break;
- putchar(',');
- }
- puts("\n };");
- size = 1U << 5;
- printf("\n static const code distfix[%u] = {", size);
- low = 0;
- for (;;) {
- if ((low % 6) == 0) printf("\n ");
- printf("{%u,%u,%d}", state.distcode[low].op, state.distcode[low].bits,
- state.distcode[low].val);
- if (++low == size) break;
- putchar(',');
- }
- puts("\n };");
-}
-#endif /* MAKEFIXED */
-
-/*
- Update the window with the last wsize (normally 32K) bytes written before
- returning. If window does not exist yet, create it. This is only called
- when a window is already in use, or when output has been written during this
- inflate call, but the end of the deflate stream has not been reached yet.
- It is also called to create a window for dictionary data when a dictionary
- is loaded.
-
- Providing output buffers larger than 32K to inflate() should provide a speed
- advantage, since only the last 32K of output is copied to the sliding window
- upon return from inflate(), and since all distances after the first 32K of
- output will fall in the output data, making match copies simpler and faster.
- The advantage may be dependent on the size of the processor's data caches.
- */
-local int updatewindow(strm, end, copy)
-z_streamp strm;
-const Bytef *end;
-unsigned copy;
-{
- struct inflate_state FAR *state;
- unsigned dist;
-
- state = (struct inflate_state FAR *)strm->state;
-
- /* if it hasn't been done already, allocate space for the window */
- if (state->window == Z_NULL) {
- state->window = (unsigned char FAR *)
- ZALLOC(strm, 1U << state->wbits,
- sizeof(unsigned char));
- if (state->window == Z_NULL) return 1;
- }
-
- /* if window not in use yet, initialize */
- if (state->wsize == 0) {
- state->wsize = 1U << state->wbits;
- state->wnext = 0;
- state->whave = 0;
- }
-
- /* copy state->wsize or less output bytes into the circular window */
- if (copy >= state->wsize) {
- zmemcpy(state->window, end - state->wsize, state->wsize);
- state->wnext = 0;
- state->whave = state->wsize;
- }
- else {
- dist = state->wsize - state->wnext;
- if (dist > copy) dist = copy;
- zmemcpy(state->window + state->wnext, end - copy, dist);
- copy -= dist;
- if (copy) {
- zmemcpy(state->window, end - copy, copy);
- state->wnext = copy;
- state->whave = state->wsize;
- }
- else {
- state->wnext += dist;
- if (state->wnext == state->wsize) state->wnext = 0;
- if (state->whave < state->wsize) state->whave += dist;
- }
- }
- return 0;
-}
-
-/* Macros for inflate(): */
-
-/* check function to use adler32() for zlib or crc32() for gzip */
-#ifdef GUNZIP
-# define UPDATE(check, buf, len) \
- (state->flags ? crc32(check, buf, len) : adler32(check, buf, len))
-#else
-# define UPDATE(check, buf, len) adler32(check, buf, len)
-#endif
-
-/* check macros for header crc */
-#ifdef GUNZIP
-# define CRC2(check, word) \
- do { \
- hbuf[0] = (unsigned char)(word); \
- hbuf[1] = (unsigned char)((word) >> 8); \
- check = crc32(check, hbuf, 2); \
- } while (0)
-
-# define CRC4(check, word) \
- do { \
- hbuf[0] = (unsigned char)(word); \
- hbuf[1] = (unsigned char)((word) >> 8); \
- hbuf[2] = (unsigned char)((word) >> 16); \
- hbuf[3] = (unsigned char)((word) >> 24); \
- check = crc32(check, hbuf, 4); \
- } while (0)
-#endif
-
-/* Load registers with state in inflate() for speed */
-#define LOAD() \
- do { \
- put = strm->next_out; \
- left = strm->avail_out; \
- next = strm->next_in; \
- have = strm->avail_in; \
- hold = state->hold; \
- bits = state->bits; \
- } while (0)
-
-/* Restore state from registers in inflate() */
-#define RESTORE() \
- do { \
- strm->next_out = put; \
- strm->avail_out = left; \
- strm->next_in = next; \
- strm->avail_in = have; \
- state->hold = hold; \
- state->bits = bits; \
- } while (0)
-
-/* Clear the input bit accumulator */
-#define INITBITS() \
- do { \
- hold = 0; \
- bits = 0; \
- } while (0)
-
-/* Get a byte of input into the bit accumulator, or return from inflate()
- if there is no input available. */
-#define PULLBYTE() \
- do { \
- if (have == 0) goto inf_leave; \
- have--; \
- hold += (unsigned long)(*next++) << bits; \
- bits += 8; \
- } while (0)
-
-/* Assure that there are at least n bits in the bit accumulator. If there is
- not enough available input to do that, then return from inflate(). */
-#define NEEDBITS(n) \
- do { \
- while (bits < (unsigned)(n)) \
- PULLBYTE(); \
- } while (0)
-
-/* Return the low n bits of the bit accumulator (n < 16) */
-#define BITS(n) \
- ((unsigned)hold & ((1U << (n)) - 1))
-
-/* Remove n bits from the bit accumulator */
-#define DROPBITS(n) \
- do { \
- hold >>= (n); \
- bits -= (unsigned)(n); \
- } while (0)
-
-/* Remove zero to seven bits as needed to go to a byte boundary */
-#define BYTEBITS() \
- do { \
- hold >>= bits & 7; \
- bits -= bits & 7; \
- } while (0)
-
-/*
- inflate() uses a state machine to process as much input data and generate as
- much output data as possible before returning. The state machine is
- structured roughly as follows:
-
- for (;;) switch (state) {
- ...
- case STATEn:
- if (not enough input data or output space to make progress)
- return;
- ... make progress ...
- state = STATEm;
- break;
- ...
- }
-
- so when inflate() is called again, the same case is attempted again, and
- if the appropriate resources are provided, the machine proceeds to the
- next state. The NEEDBITS() macro is usually the way the state evaluates
- whether it can proceed or should return. NEEDBITS() does the return if
- the requested bits are not available. The typical use of the BITS macros
- is:
-
- NEEDBITS(n);
- ... do something with BITS(n) ...
- DROPBITS(n);
-
- where NEEDBITS(n) either returns from inflate() if there isn't enough
- input left to load n bits into the accumulator, or it continues. BITS(n)
- gives the low n bits in the accumulator. When done, DROPBITS(n) drops
- the low n bits off the accumulator. INITBITS() clears the accumulator
- and sets the number of available bits to zero. BYTEBITS() discards just
- enough bits to put the accumulator on a byte boundary. After BYTEBITS()
- and a NEEDBITS(8), then BITS(8) would return the next byte in the stream.
-
- NEEDBITS(n) uses PULLBYTE() to get an available byte of input, or to return
- if there is no input available. The decoding of variable length codes uses
- PULLBYTE() directly in order to pull just enough bytes to decode the next
- code, and no more.
-
- Some states loop until they get enough input, making sure that enough
- state information is maintained to continue the loop where it left off
- if NEEDBITS() returns in the loop. For example, want, need, and keep
- would all have to actually be part of the saved state in case NEEDBITS()
- returns:
-
- case STATEw:
- while (want < need) {
- NEEDBITS(n);
- keep[want++] = BITS(n);
- DROPBITS(n);
- }
- state = STATEx;
- case STATEx:
-
- As shown above, if the next state is also the next case, then the break
- is omitted.
-
- A state may also return if there is not enough output space available to
- complete that state. Those states are copying stored data, writing a
- literal byte, and copying a matching string.
-
- When returning, a "goto inf_leave" is used to update the total counters,
- update the check value, and determine whether any progress has been made
- during that inflate() call in order to return the proper return code.
- Progress is defined as a change in either strm->avail_in or strm->avail_out.
- When there is a window, goto inf_leave will update the window with the last
- output written. If a goto inf_leave occurs in the middle of decompression
- and there is no window currently, goto inf_leave will create one and copy
- output to the window for the next call of inflate().
-
- In this implementation, the flush parameter of inflate() only affects the
- return code (per zlib.h). inflate() always writes as much as possible to
- strm->next_out, given the space available and the provided input--the effect
- documented in zlib.h of Z_SYNC_FLUSH. Furthermore, inflate() always defers
- the allocation of and copying into a sliding window until necessary, which
- provides the effect documented in zlib.h for Z_FINISH when the entire input
- stream available. So the only thing the flush parameter actually does is:
- when flush is set to Z_FINISH, inflate() cannot return Z_OK. Instead it
- will return Z_BUF_ERROR if it has not reached the end of the stream.
- */
-
-/*
- XXX: Not original zlib source code. Various "fall-through" comments
- were added to the big-ass switch block below by David Oberhollenzer
- for use in libsquashfs.
-*/
-
-int ZEXPORT inflate(strm, flush)
-z_streamp strm;
-int flush;
-{
- struct inflate_state FAR *state;
- z_const unsigned char FAR *next; /* next input */
- unsigned char FAR *put; /* next output */
- unsigned have, left; /* available input and output */
- unsigned long hold; /* bit buffer */
- unsigned bits; /* bits in bit buffer */
- unsigned in, out; /* save starting available input and output */
- unsigned copy; /* number of stored or match bytes to copy */
- unsigned char FAR *from; /* where to copy match bytes from */
- code here; /* current decoding table entry */
- code last; /* parent table entry */
- unsigned len; /* length to copy for repeats, bits to drop */
- int ret; /* return code */
-#ifdef GUNZIP
- unsigned char hbuf[4]; /* buffer for gzip header crc calculation */
-#endif
- static const unsigned short order[19] = /* permutation of code lengths */
- {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
-
- if (inflateStateCheck(strm) || strm->next_out == Z_NULL ||
- (strm->next_in == Z_NULL && strm->avail_in != 0))
- return Z_STREAM_ERROR;
-
- state = (struct inflate_state FAR *)strm->state;
- if (state->mode == TYPE) state->mode = TYPEDO; /* skip check */
- LOAD();
- in = have;
- out = left;
- ret = Z_OK;
- for (;;)
- switch (state->mode) {
- case HEAD:
- if (state->wrap == 0) {
- state->mode = TYPEDO;
- break;
- }
- NEEDBITS(16);
-#ifdef GUNZIP
- if ((state->wrap & 2) && hold == 0x8b1f) { /* gzip header */
- if (state->wbits == 0)
- state->wbits = 15;
- state->check = crc32(0L, Z_NULL, 0);
- CRC2(state->check, hold);
- INITBITS();
- state->mode = FLAGS;
- break;
- }
- state->flags = 0; /* expect zlib header */
- if (state->head != Z_NULL)
- state->head->done = -1;
- if (!(state->wrap & 1) || /* check if zlib header allowed */
-#else
- if (
-#endif
- ((BITS(8) << 8) + (hold >> 8)) % 31) {
- strm->msg = (char *)"incorrect header check";
- state->mode = BAD;
- break;
- }
- if (BITS(4) != Z_DEFLATED) {
- strm->msg = (char *)"unknown compression method";
- state->mode = BAD;
- break;
- }
- DROPBITS(4);
- len = BITS(4) + 8;
- if (state->wbits == 0)
- state->wbits = len;
- if (len > 15 || len > state->wbits) {
- strm->msg = (char *)"invalid window size";
- state->mode = BAD;
- break;
- }
- state->dmax = 1U << len;
- Tracev((stderr, "inflate: zlib header ok\n"));
- strm->adler = state->check = adler32(0L, Z_NULL, 0);
- state->mode = hold & 0x200 ? DICTID : TYPE;
- INITBITS();
- break;
-#ifdef GUNZIP
- case FLAGS:
- NEEDBITS(16);
- state->flags = (int)(hold);
- if ((state->flags & 0xff) != Z_DEFLATED) {
- strm->msg = (char *)"unknown compression method";
- state->mode = BAD;
- break;
- }
- if (state->flags & 0xe000) {
- strm->msg = (char *)"unknown header flags set";
- state->mode = BAD;
- break;
- }
- if (state->head != Z_NULL)
- state->head->text = (int)((hold >> 8) & 1);
- if ((state->flags & 0x0200) && (state->wrap & 4))
- CRC2(state->check, hold);
- INITBITS();
- state->mode = TIME;
- case TIME:
- NEEDBITS(32);
- if (state->head != Z_NULL)
- state->head->time = hold;
- if ((state->flags & 0x0200) && (state->wrap & 4))
- CRC4(state->check, hold);
- INITBITS();
- state->mode = OS;
- case OS:
- NEEDBITS(16);
- if (state->head != Z_NULL) {
- state->head->xflags = (int)(hold & 0xff);
- state->head->os = (int)(hold >> 8);
- }
- if ((state->flags & 0x0200) && (state->wrap & 4))
- CRC2(state->check, hold);
- INITBITS();
- state->mode = EXLEN;
- case EXLEN:
- if (state->flags & 0x0400) {
- NEEDBITS(16);
- state->length = (unsigned)(hold);
- if (state->head != Z_NULL)
- state->head->extra_len = (unsigned)hold;
- if ((state->flags & 0x0200) && (state->wrap & 4))
- CRC2(state->check, hold);
- INITBITS();
- }
- else if (state->head != Z_NULL)
- state->head->extra = Z_NULL;
- state->mode = EXTRA;
- case EXTRA:
- if (state->flags & 0x0400) {
- copy = state->length;
- if (copy > have) copy = have;
- if (copy) {
- if (state->head != Z_NULL &&
- state->head->extra != Z_NULL) {
- len = state->head->extra_len - state->length;
- zmemcpy(state->head->extra + len, next,
- len + copy > state->head->extra_max ?
- state->head->extra_max - len : copy);
- }
- if ((state->flags & 0x0200) && (state->wrap & 4))
- state->check = crc32(state->check, next, copy);
- have -= copy;
- next += copy;
- state->length -= copy;
- }
- if (state->length) goto inf_leave;
- }
- state->length = 0;
- state->mode = NAME;
- case NAME:
- if (state->flags & 0x0800) {
- if (have == 0) goto inf_leave;
- copy = 0;
- do {
- len = (unsigned)(next[copy++]);
- if (state->head != Z_NULL &&
- state->head->name != Z_NULL &&
- state->length < state->head->name_max)
- state->head->name[state->length++] = (Bytef)len;
- } while (len && copy < have);
- if ((state->flags & 0x0200) && (state->wrap & 4))
- state->check = crc32(state->check, next, copy);
- have -= copy;
- next += copy;
- if (len) goto inf_leave;
- }
- else if (state->head != Z_NULL)
- state->head->name = Z_NULL;
- state->length = 0;
- state->mode = COMMENT;
- case COMMENT:
- if (state->flags & 0x1000) {
- if (have == 0) goto inf_leave;
- copy = 0;
- do {
- len = (unsigned)(next[copy++]);
- if (state->head != Z_NULL &&
- state->head->comment != Z_NULL &&
- state->length < state->head->comm_max)
- state->head->comment[state->length++] = (Bytef)len;
- } while (len && copy < have);
- if ((state->flags & 0x0200) && (state->wrap & 4))
- state->check = crc32(state->check, next, copy);
- have -= copy;
- next += copy;
- if (len) goto inf_leave;
- }
- else if (state->head != Z_NULL)
- state->head->comment = Z_NULL;
- state->mode = HCRC;
- case HCRC:
- if (state->flags & 0x0200) {
- NEEDBITS(16);
- if ((state->wrap & 4) && hold != (state->check & 0xffff)) {
- strm->msg = (char *)"header crc mismatch";
- state->mode = BAD;
- break;
- }
- INITBITS();
- }
- if (state->head != Z_NULL) {
- state->head->hcrc = (int)((state->flags >> 9) & 1);
- state->head->done = 1;
- }
- strm->adler = state->check = crc32(0L, Z_NULL, 0);
- state->mode = TYPE;
- break;
-#endif
- case DICTID:
- NEEDBITS(32);
- strm->adler = state->check = ZSWAP32(hold);
- INITBITS();
- state->mode = DICT;
- /* fall-through */
- case DICT:
- if (state->havedict == 0) {
- RESTORE();
- return Z_NEED_DICT;
- }
- strm->adler = state->check = adler32(0L, Z_NULL, 0);
- state->mode = TYPE;
- /* fall-through */
- case TYPE:
- if (flush == Z_BLOCK || flush == Z_TREES) goto inf_leave;
- /* fall-through */
- case TYPEDO:
- if (state->last) {
- BYTEBITS();
- state->mode = CHECK;
- break;
- }
- NEEDBITS(3);
- state->last = BITS(1);
- DROPBITS(1);
- switch (BITS(2)) {
- case 0: /* stored block */
- Tracev((stderr, "inflate: stored block%s\n",
- state->last ? " (last)" : ""));
- state->mode = STORED;
- break;
- case 1: /* fixed block */
- fixedtables(state);
- Tracev((stderr, "inflate: fixed codes block%s\n",
- state->last ? " (last)" : ""));
- state->mode = LEN_; /* decode codes */
- if (flush == Z_TREES) {
- DROPBITS(2);
- goto inf_leave;
- }
- break;
- case 2: /* dynamic block */
- Tracev((stderr, "inflate: dynamic codes block%s\n",
- state->last ? " (last)" : ""));
- state->mode = TABLE;
- break;
- case 3:
- strm->msg = (char *)"invalid block type";
- state->mode = BAD;
- }
- DROPBITS(2);
- break;
- case STORED:
- BYTEBITS(); /* go to byte boundary */
- NEEDBITS(32);
- if ((hold & 0xffff) != ((hold >> 16) ^ 0xffff)) {
- strm->msg = (char *)"invalid stored block lengths";
- state->mode = BAD;
- break;
- }
- state->length = (unsigned)hold & 0xffff;
- Tracev((stderr, "inflate: stored length %u\n",
- state->length));
- INITBITS();
- state->mode = COPY_;
- if (flush == Z_TREES) goto inf_leave;
- /* fall-through */
- case COPY_:
- state->mode = COPY;
- /* fall-through */
- case COPY:
- copy = state->length;
- if (copy) {
- if (copy > have) copy = have;
- if (copy > left) copy = left;
- if (copy == 0) goto inf_leave;
- zmemcpy(put, next, copy);
- have -= copy;
- next += copy;
- left -= copy;
- put += copy;
- state->length -= copy;
- break;
- }
- Tracev((stderr, "inflate: stored end\n"));
- state->mode = TYPE;
- break;
- case TABLE:
- NEEDBITS(14);
- state->nlen = BITS(5) + 257;
- DROPBITS(5);
- state->ndist = BITS(5) + 1;
- DROPBITS(5);
- state->ncode = BITS(4) + 4;
- DROPBITS(4);
-#ifndef PKZIP_BUG_WORKAROUND
- if (state->nlen > 286 || state->ndist > 30) {
- strm->msg = (char *)"too many length or distance symbols";
- state->mode = BAD;
- break;
- }
-#endif
- Tracev((stderr, "inflate: table sizes ok\n"));
- state->have = 0;
- state->mode = LENLENS;
- /* fall-through */
- case LENLENS:
- while (state->have < state->ncode) {
- NEEDBITS(3);
- state->lens[order[state->have++]] = (unsigned short)BITS(3);
- DROPBITS(3);
- }
- while (state->have < 19)
- state->lens[order[state->have++]] = 0;
- state->next = state->codes;
- state->lencode = (const code FAR *)(state->next);
- state->lenbits = 7;
- ret = inflate_table(CODES, state->lens, 19, &(state->next),
- &(state->lenbits), state->work);
- if (ret) {
- strm->msg = (char *)"invalid code lengths set";
- state->mode = BAD;
- break;
- }
- Tracev((stderr, "inflate: code lengths ok\n"));
- state->have = 0;
- state->mode = CODELENS;
- /* fall-through */
- case CODELENS:
- while (state->have < state->nlen + state->ndist) {
- for (;;) {
- here = state->lencode[BITS(state->lenbits)];
- if ((unsigned)(here.bits) <= bits) break;
- PULLBYTE();
- }
- if (here.val < 16) {
- DROPBITS(here.bits);
- state->lens[state->have++] = here.val;
- }
- else {
- if (here.val == 16) {
- NEEDBITS(here.bits + 2);
- DROPBITS(here.bits);
- if (state->have == 0) {
- strm->msg = (char *)"invalid bit length repeat";
- state->mode = BAD;
- break;
- }
- len = state->lens[state->have - 1];
- copy = 3 + BITS(2);
- DROPBITS(2);
- }
- else if (here.val == 17) {
- NEEDBITS(here.bits + 3);
- DROPBITS(here.bits);
- len = 0;
- copy = 3 + BITS(3);
- DROPBITS(3);
- }
- else {
- NEEDBITS(here.bits + 7);
- DROPBITS(here.bits);
- len = 0;
- copy = 11 + BITS(7);
- DROPBITS(7);
- }
- if (state->have + copy > state->nlen + state->ndist) {
- strm->msg = (char *)"invalid bit length repeat";
- state->mode = BAD;
- break;
- }
- while (copy--)
- state->lens[state->have++] = (unsigned short)len;
- }
- }
-
- /* handle error breaks in while */
- if (state->mode == BAD) break;
-
- /* check for end-of-block code (better have one) */
- if (state->lens[256] == 0) {
- strm->msg = (char *)"invalid code -- missing end-of-block";
- state->mode = BAD;
- break;
- }
-
- /* build code tables -- note: do not change the lenbits or distbits
- values here (9 and 6) without reading the comments in inftrees.h
- concerning the ENOUGH constants, which depend on those values */
- state->next = state->codes;
- state->lencode = (const code FAR *)(state->next);
- state->lenbits = 9;
- ret = inflate_table(LENS, state->lens, state->nlen, &(state->next),
- &(state->lenbits), state->work);
- if (ret) {
- strm->msg = (char *)"invalid literal/lengths set";
- state->mode = BAD;
- break;
- }
- state->distcode = (const code FAR *)(state->next);
- state->distbits = 6;
- ret = inflate_table(DISTS, state->lens + state->nlen, state->ndist,
- &(state->next), &(state->distbits), state->work);
- if (ret) {
- strm->msg = (char *)"invalid distances set";
- state->mode = BAD;
- break;
- }
- Tracev((stderr, "inflate: codes ok\n"));
- state->mode = LEN_;
- if (flush == Z_TREES) goto inf_leave;
- /* fall-through */
- case LEN_:
- state->mode = LEN;
- /* fall-through */
- case LEN:
- if (have >= 6 && left >= 258) {
- RESTORE();
- inflate_fast(strm, out);
- LOAD();
- if (state->mode == TYPE)
- state->back = -1;
- break;
- }
- state->back = 0;
- for (;;) {
- here = state->lencode[BITS(state->lenbits)];
- if ((unsigned)(here.bits) <= bits) break;
- PULLBYTE();
- }
- if (here.op && (here.op & 0xf0) == 0) {
- last = here;
- for (;;) {
- here = state->lencode[last.val +
- (BITS(last.bits + last.op) >> last.bits)];
- if ((unsigned)(last.bits + here.bits) <= bits) break;
- PULLBYTE();
- }
- DROPBITS(last.bits);
- state->back += last.bits;
- }
- DROPBITS(here.bits);
- state->back += here.bits;
- state->length = (unsigned)here.val;
- if ((int)(here.op) == 0) {
- Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
- "inflate: literal '%c'\n" :
- "inflate: literal 0x%02x\n", here.val));
- state->mode = LIT;
- break;
- }
- if (here.op & 32) {
- Tracevv((stderr, "inflate: end of block\n"));
- state->back = -1;
- state->mode = TYPE;
- break;
- }
- if (here.op & 64) {
- strm->msg = (char *)"invalid literal/length code";
- state->mode = BAD;
- break;
- }
- state->extra = (unsigned)(here.op) & 15;
- state->mode = LENEXT;
- /* fall-through */
- case LENEXT:
- if (state->extra) {
- NEEDBITS(state->extra);
- state->length += BITS(state->extra);
- DROPBITS(state->extra);
- state->back += state->extra;
- }
- Tracevv((stderr, "inflate: length %u\n", state->length));
- state->was = state->length;
- state->mode = DIST;
- /* fall-through */
- case DIST:
- for (;;) {
- here = state->distcode[BITS(state->distbits)];
- if ((unsigned)(here.bits) <= bits) break;
- PULLBYTE();
- }
- if ((here.op & 0xf0) == 0) {
- last = here;
- for (;;) {
- here = state->distcode[last.val +
- (BITS(last.bits + last.op) >> last.bits)];
- if ((unsigned)(last.bits + here.bits) <= bits) break;
- PULLBYTE();
- }
- DROPBITS(last.bits);
- state->back += last.bits;
- }
- DROPBITS(here.bits);
- state->back += here.bits;
- if (here.op & 64) {
- strm->msg = (char *)"invalid distance code";
- state->mode = BAD;
- break;
- }
- state->offset = (unsigned)here.val;
- state->extra = (unsigned)(here.op) & 15;
- state->mode = DISTEXT;
- /* fall-through */
- case DISTEXT:
- if (state->extra) {
- NEEDBITS(state->extra);
- state->offset += BITS(state->extra);
- DROPBITS(state->extra);
- state->back += state->extra;
- }
-#ifdef INFLATE_STRICT
- if (state->offset > state->dmax) {
- strm->msg = (char *)"invalid distance too far back";
- state->mode = BAD;
- break;
- }
-#endif
- Tracevv((stderr, "inflate: distance %u\n", state->offset));
- state->mode = MATCH;
- /* fall-through */
- case MATCH:
- if (left == 0) goto inf_leave;
- copy = out - left;
- if (state->offset > copy) { /* copy from window */
- copy = state->offset - copy;
- if (copy > state->whave) {
- if (state->sane) {
- strm->msg = (char *)"invalid distance too far back";
- state->mode = BAD;
- break;
- }
-#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
- Trace((stderr, "inflate.c too far\n"));
- copy -= state->whave;
- if (copy > state->length) copy = state->length;
- if (copy > left) copy = left;
- left -= copy;
- state->length -= copy;
- do {
- *put++ = 0;
- } while (--copy);
- if (state->length == 0) state->mode = LEN;
- break;
-#endif
- }
- if (copy > state->wnext) {
- copy -= state->wnext;
- from = state->window + (state->wsize - copy);
- }
- else
- from = state->window + (state->wnext - copy);
- if (copy > state->length) copy = state->length;
- }
- else { /* copy from output */
- from = put - state->offset;
- copy = state->length;
- }
- if (copy > left) copy = left;
- left -= copy;
- state->length -= copy;
- do {
- *put++ = *from++;
- } while (--copy);
- if (state->length == 0) state->mode = LEN;
- break;
- case LIT:
- if (left == 0) goto inf_leave;
- *put++ = (unsigned char)(state->length);
- left--;
- state->mode = LEN;
- break;
- case CHECK:
- if (state->wrap) {
- NEEDBITS(32);
- out -= left;
- strm->total_out += out;
- state->total += out;
- if ((state->wrap & 4) && out)
- strm->adler = state->check =
- UPDATE(state->check, put - out, out);
- out = left;
- if ((state->wrap & 4) && (
-#ifdef GUNZIP
- state->flags ? hold :
-#endif
- ZSWAP32(hold)) != state->check) {
- strm->msg = (char *)"incorrect data check";
- state->mode = BAD;
- break;
- }
- INITBITS();
- Tracev((stderr, "inflate: check matches trailer\n"));
- }
-#ifdef GUNZIP
- state->mode = LENGTH;
- /* fall-through */
- case LENGTH:
- if (state->wrap && state->flags) {
- NEEDBITS(32);
- if (hold != (state->total & 0xffffffffUL)) {
- strm->msg = (char *)"incorrect length check";
- state->mode = BAD;
- break;
- }
- INITBITS();
- Tracev((stderr, "inflate: length matches trailer\n"));
- }
-#endif
- state->mode = DONE;
- /* fall-through */
- case DONE:
- ret = Z_STREAM_END;
- goto inf_leave;
- case BAD:
- ret = Z_DATA_ERROR;
- goto inf_leave;
- case MEM:
- return Z_MEM_ERROR;
- case SYNC:
- default:
- return Z_STREAM_ERROR;
- }
-
- /*
- Return from inflate(), updating the total counts and the check value.
- If there was no progress during the inflate() call, return a buffer
- error. Call updatewindow() to create and/or update the window state.
- Note: a memory error from inflate() is non-recoverable.
- */
- inf_leave:
- RESTORE();
- if (state->wsize || (out != strm->avail_out && state->mode < BAD &&
- (state->mode < CHECK || flush != Z_FINISH)))
- if (updatewindow(strm, strm->next_out, out - strm->avail_out)) {
- state->mode = MEM;
- return Z_MEM_ERROR;
- }
- in -= strm->avail_in;
- out -= strm->avail_out;
- strm->total_in += in;
- strm->total_out += out;
- state->total += out;
- if ((state->wrap & 4) && out)
- strm->adler = state->check =
- UPDATE(state->check, strm->next_out - out, out);
- strm->data_type = (int)state->bits + (state->last ? 64 : 0) +
- (state->mode == TYPE ? 128 : 0) +
- (state->mode == LEN_ || state->mode == COPY_ ? 256 : 0);
- if (((in == 0 && out == 0) || flush == Z_FINISH) && ret == Z_OK)
- ret = Z_BUF_ERROR;
- return ret;
-}
-
-int ZEXPORT inflateEnd(strm)
-z_streamp strm;
-{
- struct inflate_state FAR *state;
- if (inflateStateCheck(strm))
- return Z_STREAM_ERROR;
- state = (struct inflate_state FAR *)strm->state;
- if (state->window != Z_NULL) ZFREE(strm, state->window);
- ZFREE(strm, strm->state);
- strm->state = Z_NULL;
- Tracev((stderr, "inflate: end\n"));
- return Z_OK;
-}
-
-int ZEXPORT inflateGetDictionary(strm, dictionary, dictLength)
-z_streamp strm;
-Bytef *dictionary;
-uInt *dictLength;
-{
- struct inflate_state FAR *state;
-
- /* check state */
- if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
- state = (struct inflate_state FAR *)strm->state;
-
- /* copy dictionary */
- if (state->whave && dictionary != Z_NULL) {
- zmemcpy(dictionary, state->window + state->wnext,
- state->whave - state->wnext);
- zmemcpy(dictionary + state->whave - state->wnext,
- state->window, state->wnext);
- }
- if (dictLength != Z_NULL)
- *dictLength = state->whave;
- return Z_OK;
-}
-
-int ZEXPORT inflateSetDictionary(strm, dictionary, dictLength)
-z_streamp strm;
-const Bytef *dictionary;
-uInt dictLength;
-{
- struct inflate_state FAR *state;
- unsigned long dictid;
- int ret;
-
- /* check state */
- if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
- state = (struct inflate_state FAR *)strm->state;
- if (state->wrap != 0 && state->mode != DICT)
- return Z_STREAM_ERROR;
-
- /* check for correct dictionary identifier */
- if (state->mode == DICT) {
- dictid = adler32(0L, Z_NULL, 0);
- dictid = adler32(dictid, dictionary, dictLength);
- if (dictid != state->check)
- return Z_DATA_ERROR;
- }
-
- /* copy dictionary to window using updatewindow(), which will amend the
- existing dictionary if appropriate */
- ret = updatewindow(strm, dictionary + dictLength, dictLength);
- if (ret) {
- state->mode = MEM;
- return Z_MEM_ERROR;
- }
- state->havedict = 1;
- Tracev((stderr, "inflate: dictionary set\n"));
- return Z_OK;
-}
-
-int ZEXPORT inflateGetHeader(strm, head)
-z_streamp strm;
-gz_headerp head;
-{
- struct inflate_state FAR *state;
-
- /* check state */
- if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
- state = (struct inflate_state FAR *)strm->state;
- if ((state->wrap & 2) == 0) return Z_STREAM_ERROR;
-
- /* save header structure */
- state->head = head;
- head->done = 0;
- return Z_OK;
-}
-
-/*
- Search buf[0..len-1] for the pattern: 0, 0, 0xff, 0xff. Return when found
- or when out of input. When called, *have is the number of pattern bytes
- found in order so far, in 0..3. On return *have is updated to the new
- state. If on return *have equals four, then the pattern was found and the
- return value is how many bytes were read including the last byte of the
- pattern. If *have is less than four, then the pattern has not been found
- yet and the return value is len. In the latter case, syncsearch() can be
- called again with more data and the *have state. *have is initialized to
- zero for the first call.
- */
-local unsigned syncsearch(have, buf, len)
-unsigned FAR *have;
-const unsigned char FAR *buf;
-unsigned len;
-{
- unsigned got;
- unsigned next;
-
- got = *have;
- next = 0;
- while (next < len && got < 4) {
- if ((int)(buf[next]) == (got < 2 ? 0 : 0xff))
- got++;
- else if (buf[next])
- got = 0;
- else
- got = 4 - got;
- next++;
- }
- *have = got;
- return next;
-}
-
-int ZEXPORT inflateSync(strm)
-z_streamp strm;
-{
- unsigned len; /* number of bytes to look at or looked at */
- unsigned long in, out; /* temporary to save total_in and total_out */
- unsigned char buf[4]; /* to restore bit buffer to byte string */
- struct inflate_state FAR *state;
-
- /* check parameters */
- if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
- state = (struct inflate_state FAR *)strm->state;
- if (strm->avail_in == 0 && state->bits < 8) return Z_BUF_ERROR;
-
- /* if first time, start search in bit buffer */
- if (state->mode != SYNC) {
- state->mode = SYNC;
- state->hold <<= state->bits & 7;
- state->bits -= state->bits & 7;
- len = 0;
- while (state->bits >= 8) {
- buf[len++] = (unsigned char)(state->hold);
- state->hold >>= 8;
- state->bits -= 8;
- }
- state->have = 0;
- syncsearch(&(state->have), buf, len);
- }
-
- /* search available input */
- len = syncsearch(&(state->have), strm->next_in, strm->avail_in);
- strm->avail_in -= len;
- strm->next_in += len;
- strm->total_in += len;
-
- /* return no joy or set up to restart inflate() on a new block */
- if (state->have != 4) return Z_DATA_ERROR;
- in = strm->total_in; out = strm->total_out;
- inflateReset(strm);
- strm->total_in = in; strm->total_out = out;
- state->mode = TYPE;
- return Z_OK;
-}
-
-/*
- Returns true if inflate is currently at the end of a block generated by
- Z_SYNC_FLUSH or Z_FULL_FLUSH. This function is used by one PPP
- implementation to provide an additional safety check. PPP uses
- Z_SYNC_FLUSH but removes the length bytes of the resulting empty stored
- block. When decompressing, PPP checks that at the end of input packet,
- inflate is waiting for these length bytes.
- */
-int ZEXPORT inflateSyncPoint(strm)
-z_streamp strm;
-{
- struct inflate_state FAR *state;
-
- if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
- state = (struct inflate_state FAR *)strm->state;
- return state->mode == STORED && state->bits == 0;
-}
-
-int ZEXPORT inflateCopy(dest, source)
-z_streamp dest;
-z_streamp source;
-{
- struct inflate_state FAR *state;
- struct inflate_state FAR *copy;
- unsigned char FAR *window;
- unsigned wsize;
-
- /* check input */
- if (inflateStateCheck(source) || dest == Z_NULL)
- return Z_STREAM_ERROR;
- state = (struct inflate_state FAR *)source->state;
-
- /* allocate space */
- copy = (struct inflate_state FAR *)
- ZALLOC(source, 1, sizeof(struct inflate_state));
- if (copy == Z_NULL) return Z_MEM_ERROR;
- window = Z_NULL;
- if (state->window != Z_NULL) {
- window = (unsigned char FAR *)
- ZALLOC(source, 1U << state->wbits, sizeof(unsigned char));
- if (window == Z_NULL) {
- ZFREE(source, copy);
- return Z_MEM_ERROR;
- }
- }
-
- /* copy state */
- zmemcpy((voidpf)dest, (voidpf)source, sizeof(z_stream));
- zmemcpy((voidpf)copy, (voidpf)state, sizeof(struct inflate_state));
- copy->strm = dest;
- if (state->lencode >= state->codes &&
- state->lencode <= state->codes + ENOUGH - 1) {
- copy->lencode = copy->codes + (state->lencode - state->codes);
- copy->distcode = copy->codes + (state->distcode - state->codes);
- }
- copy->next = copy->codes + (state->next - state->codes);
- if (window != Z_NULL) {
- wsize = 1U << state->wbits;
- zmemcpy(window, state->window, wsize);
- }
- copy->window = window;
- dest->state = (struct internal_state FAR *)copy;
- return Z_OK;
-}
-
-int ZEXPORT inflateUndermine(strm, subvert)
-z_streamp strm;
-int subvert;
-{
- struct inflate_state FAR *state;
-
- if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
- state = (struct inflate_state FAR *)strm->state;
-#ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
- state->sane = !subvert;
- return Z_OK;
-#else
- (void)subvert;
- state->sane = 1;
- return Z_DATA_ERROR;
-#endif
-}
-
-int ZEXPORT inflateValidate(strm, check)
-z_streamp strm;
-int check;
-{
- struct inflate_state FAR *state;
-
- if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
- state = (struct inflate_state FAR *)strm->state;
- if (check)
- state->wrap |= 4;
- else
- state->wrap &= ~4;
- return Z_OK;
-}
-
-long ZEXPORT inflateMark(strm)
-z_streamp strm;
-{
- struct inflate_state FAR *state;
-
- if (inflateStateCheck(strm))
- return -(1L << 16);
- state = (struct inflate_state FAR *)strm->state;
- return (long)(((unsigned long)((long)state->back)) << 16) +
- (state->mode == COPY ? state->length :
- (state->mode == MATCH ? state->was - state->length : 0));
-}
-
-unsigned long ZEXPORT inflateCodesUsed(strm)
-z_streamp strm;
-{
- struct inflate_state FAR *state;
- if (inflateStateCheck(strm)) return (unsigned long)-1;
- state = (struct inflate_state FAR *)strm->state;
- return (unsigned long)(state->next - state->codes);
-}
diff --git a/lib/sqfs/comp/zlib/inflate.h b/lib/sqfs/comp/zlib/inflate.h
deleted file mode 100644
index a46cce6..0000000
--- a/lib/sqfs/comp/zlib/inflate.h
+++ /dev/null
@@ -1,125 +0,0 @@
-/* inflate.h -- internal inflate state definition
- * Copyright (C) 1995-2016 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* WARNING: this file should *not* be used by applications. It is
- part of the implementation of the compression library and is
- subject to change. Applications should only use zlib.h.
- */
-
-/* define NO_GZIP when compiling if you want to disable gzip header and
- trailer decoding by inflate(). NO_GZIP would be used to avoid linking in
- the crc code when it is not needed. For shared libraries, gzip decoding
- should be left enabled. */
-#ifndef NO_GZIP
-# define GUNZIP
-#endif
-
-/* Possible inflate modes between inflate() calls */
-typedef enum {
- HEAD = 16180, /* i: waiting for magic header */
- FLAGS, /* i: waiting for method and flags (gzip) */
- TIME, /* i: waiting for modification time (gzip) */
- OS, /* i: waiting for extra flags and operating system (gzip) */
- EXLEN, /* i: waiting for extra length (gzip) */
- EXTRA, /* i: waiting for extra bytes (gzip) */
- NAME, /* i: waiting for end of file name (gzip) */
- COMMENT, /* i: waiting for end of comment (gzip) */
- HCRC, /* i: waiting for header crc (gzip) */
- DICTID, /* i: waiting for dictionary check value */
- DICT, /* waiting for inflateSetDictionary() call */
- TYPE, /* i: waiting for type bits, including last-flag bit */
- TYPEDO, /* i: same, but skip check to exit inflate on new block */
- STORED, /* i: waiting for stored size (length and complement) */
- COPY_, /* i/o: same as COPY below, but only first time in */
- COPY, /* i/o: waiting for input or output to copy stored block */
- TABLE, /* i: waiting for dynamic block table lengths */
- LENLENS, /* i: waiting for code length code lengths */
- CODELENS, /* i: waiting for length/lit and distance code lengths */
- LEN_, /* i: same as LEN below, but only first time in */
- LEN, /* i: waiting for length/lit/eob code */
- LENEXT, /* i: waiting for length extra bits */
- DIST, /* i: waiting for distance code */
- DISTEXT, /* i: waiting for distance extra bits */
- MATCH, /* o: waiting for output space to copy string */
- LIT, /* o: waiting for output space to write literal */
- CHECK, /* i: waiting for 32-bit check value */
- LENGTH, /* i: waiting for 32-bit length (gzip) */
- DONE, /* finished check, done -- remain here until reset */
- BAD, /* got a data error -- remain here until reset */
- MEM, /* got an inflate() memory error -- remain here until reset */
- SYNC /* looking for synchronization bytes to restart inflate() */
-} inflate_mode;
-
-/*
- State transitions between above modes -
-
- (most modes can go to BAD or MEM on error -- not shown for clarity)
-
- Process header:
- HEAD -> (gzip) or (zlib) or (raw)
- (gzip) -> FLAGS -> TIME -> OS -> EXLEN -> EXTRA -> NAME -> COMMENT ->
- HCRC -> TYPE
- (zlib) -> DICTID or TYPE
- DICTID -> DICT -> TYPE
- (raw) -> TYPEDO
- Read deflate blocks:
- TYPE -> TYPEDO -> STORED or TABLE or LEN_ or CHECK
- STORED -> COPY_ -> COPY -> TYPE
- TABLE -> LENLENS -> CODELENS -> LEN_
- LEN_ -> LEN
- Read deflate codes in fixed or dynamic block:
- LEN -> LENEXT or LIT or TYPE
- LENEXT -> DIST -> DISTEXT -> MATCH -> LEN
- LIT -> LEN
- Process trailer:
- CHECK -> LENGTH -> DONE
- */
-
-/* State maintained between inflate() calls -- approximately 7K bytes, not
- including the allocated sliding window, which is up to 32K bytes. */
-struct inflate_state {
- z_streamp strm; /* pointer back to this zlib stream */
- inflate_mode mode; /* current inflate mode */
- int last; /* true if processing last block */
- int wrap; /* bit 0 true for zlib, bit 1 true for gzip,
- bit 2 true to validate check value */
- int havedict; /* true if dictionary provided */
- int flags; /* gzip header method and flags (0 if zlib) */
- unsigned dmax; /* zlib header max distance (INFLATE_STRICT) */
- unsigned long check; /* protected copy of check value */
- unsigned long total; /* protected copy of output count */
- gz_headerp head; /* where to save gzip header information */
- /* sliding window */
- unsigned wbits; /* log base 2 of requested window size */
- unsigned wsize; /* window size or zero if not using window */
- unsigned whave; /* valid bytes in the window */
- unsigned wnext; /* window write index */
- unsigned char FAR *window; /* allocated sliding window, if needed */
- /* bit accumulator */
- unsigned long hold; /* input bit accumulator */
- unsigned bits; /* number of bits in "in" */
- /* for string and stored block copying */
- unsigned length; /* literal or length of data to copy */
- unsigned offset; /* distance back to copy string from */
- /* for table and code decoding */
- unsigned extra; /* extra bits needed */
- /* fixed and dynamic code tables */
- code const FAR *lencode; /* starting table for length/literal codes */
- code const FAR *distcode; /* starting table for distance codes */
- unsigned lenbits; /* index bits for lencode */
- unsigned distbits; /* index bits for distcode */
- /* dynamic table building */
- unsigned ncode; /* number of code length code lengths */
- unsigned nlen; /* number of length code lengths */
- unsigned ndist; /* number of distance code lengths */
- unsigned have; /* number of code lengths in lens[] */
- code FAR *next; /* next available space in codes[] */
- unsigned short lens[320]; /* temporary storage for code lengths */
- unsigned short work[288]; /* work area for code table building */
- code codes[ENOUGH]; /* space for code tables */
- int sane; /* if false, allow invalid distance too far */
- int back; /* bits back of last unprocessed length/lit */
- unsigned was; /* initial length of match */
-};
diff --git a/lib/sqfs/comp/zlib/inftrees.c b/lib/sqfs/comp/zlib/inftrees.c
deleted file mode 100644
index 8d45454..0000000
--- a/lib/sqfs/comp/zlib/inftrees.c
+++ /dev/null
@@ -1,309 +0,0 @@
-/* inftrees.c -- generate Huffman trees for efficient decoding
- * Copyright (C) 1995-2017 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-#include "zutil.h"
-#include "inftrees.h"
-
-#define MAXBITS 15
-
-/*
- XXX: Not original zlib source code. The following 2 lines were
- commented out by David Oberhollenzer for use in in libsquashfs.
-
-const char inflate_copyright[] =
- " inflate 1.2.11 Copyright 1995-2017 Mark Adler ";
-*/
-/*
- If you use the zlib library in a product, an acknowledgment is welcome
- in the documentation of your product. If for some reason you cannot
- include such an acknowledgment, I would appreciate that you keep this
- copyright string in the executable of your product.
- */
-
-/*
- Build a set of tables to decode the provided canonical Huffman code.
- The code lengths are lens[0..codes-1]. The result starts at *table,
- whose indices are 0..2^bits-1. work is a writable array of at least
- lens shorts, which is used as a work area. type is the type of code
- to be generated, CODES, LENS, or DISTS. On return, zero is success,
- -1 is an invalid code, and +1 means that ENOUGH isn't enough. table
- on return points to the next available entry's address. bits is the
- requested root table index bits, and on return it is the actual root
- table index bits. It will differ if the request is greater than the
- longest code or if it is less than the shortest code.
- */
-int ZLIB_INTERNAL inflate_table(type, lens, codes, table, bits, work)
-codetype type;
-unsigned short FAR *lens;
-unsigned codes;
-code FAR * FAR *table;
-unsigned FAR *bits;
-unsigned short FAR *work;
-{
- unsigned len; /* a code's length in bits */
- unsigned sym; /* index of code symbols */
- unsigned min, max; /* minimum and maximum code lengths */
- unsigned root; /* number of index bits for root table */
- unsigned curr; /* number of index bits for current table */
- unsigned drop; /* code bits to drop for sub-table */
- int left; /* number of prefix codes available */
- unsigned used; /* code entries in table used */
- unsigned huff; /* Huffman code */
- unsigned incr; /* for incrementing code, index */
- unsigned fill; /* index for replicating entries */
- unsigned low; /* low bits for current root entry */
- unsigned mask; /* mask for low root bits */
- code here; /* table entry for duplication */
- code FAR *next; /* next available space in table */
- const unsigned short FAR *base; /* base value table to use */
- const unsigned short FAR *extra; /* extra bits table to use */
- unsigned match; /* use base and extra for symbol >= match */
- unsigned short count[MAXBITS+1]; /* number of codes of each length */
- unsigned short offs[MAXBITS+1]; /* offsets in table for each length */
- static const unsigned short lbase[31] = { /* Length codes 257..285 base */
- 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
- 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
- static const unsigned short lext[31] = { /* Length codes 257..285 extra */
- 16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18,
- 19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 77, 202};
- static const unsigned short dbase[32] = { /* Distance codes 0..29 base */
- 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
- 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
- 8193, 12289, 16385, 24577, 0, 0};
- static const unsigned short dext[32] = { /* Distance codes 0..29 extra */
- 16, 16, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22,
- 23, 23, 24, 24, 25, 25, 26, 26, 27, 27,
- 28, 28, 29, 29, 64, 64};
-
- /*
- Process a set of code lengths to create a canonical Huffman code. The
- code lengths are lens[0..codes-1]. Each length corresponds to the
- symbols 0..codes-1. The Huffman code is generated by first sorting the
- symbols by length from short to long, and retaining the symbol order
- for codes with equal lengths. Then the code starts with all zero bits
- for the first code of the shortest length, and the codes are integer
- increments for the same length, and zeros are appended as the length
- increases. For the deflate format, these bits are stored backwards
- from their more natural integer increment ordering, and so when the
- decoding tables are built in the large loop below, the integer codes
- are incremented backwards.
-
- This routine assumes, but does not check, that all of the entries in
- lens[] are in the range 0..MAXBITS. The caller must assure this.
- 1..MAXBITS is interpreted as that code length. zero means that that
- symbol does not occur in this code.
-
- The codes are sorted by computing a count of codes for each length,
- creating from that a table of starting indices for each length in the
- sorted table, and then entering the symbols in order in the sorted
- table. The sorted table is work[], with that space being provided by
- the caller.
-
- The length counts are used for other purposes as well, i.e. finding
- the minimum and maximum length codes, determining if there are any
- codes at all, checking for a valid set of lengths, and looking ahead
- at length counts to determine sub-table sizes when building the
- decoding tables.
- */
-
- /* accumulate lengths for codes (assumes lens[] all in 0..MAXBITS) */
- for (len = 0; len <= MAXBITS; len++)
- count[len] = 0;
- for (sym = 0; sym < codes; sym++)
- count[lens[sym]]++;
-
- /* bound code lengths, force root to be within code lengths */
- root = *bits;
- for (max = MAXBITS; max >= 1; max--)
- if (count[max] != 0) break;
- if (root > max) root = max;
- if (max == 0) { /* no symbols to code at all */
- here.op = (unsigned char)64; /* invalid code marker */
- here.bits = (unsigned char)1;
- here.val = (unsigned short)0;
- *(*table)++ = here; /* make a table to force an error */
- *(*table)++ = here;
- *bits = 1;
- return 0; /* no symbols, but wait for decoding to report error */
- }
- for (min = 1; min < max; min++)
- if (count[min] != 0) break;
- if (root < min) root = min;
-
- /* check for an over-subscribed or incomplete set of lengths */
- left = 1;
- for (len = 1; len <= MAXBITS; len++) {
- left <<= 1;
- left -= count[len];
- if (left < 0) return -1; /* over-subscribed */
- }
- if (left > 0 && (type == CODES || max != 1))
- return -1; /* incomplete set */
-
- /* generate offsets into symbol table for each length for sorting */
- offs[1] = 0;
- for (len = 1; len < MAXBITS; len++)
- offs[len + 1] = offs[len] + count[len];
-
- /* sort symbols by length, by symbol order within each length */
- for (sym = 0; sym < codes; sym++)
- if (lens[sym] != 0) work[offs[lens[sym]]++] = (unsigned short)sym;
-
- /*
- Create and fill in decoding tables. In this loop, the table being
- filled is at next and has curr index bits. The code being used is huff
- with length len. That code is converted to an index by dropping drop
- bits off of the bottom. For codes where len is less than drop + curr,
- those top drop + curr - len bits are incremented through all values to
- fill the table with replicated entries.
-
- root is the number of index bits for the root table. When len exceeds
- root, sub-tables are created pointed to by the root entry with an index
- of the low root bits of huff. This is saved in low to check for when a
- new sub-table should be started. drop is zero when the root table is
- being filled, and drop is root when sub-tables are being filled.
-
- When a new sub-table is needed, it is necessary to look ahead in the
- code lengths to determine what size sub-table is needed. The length
- counts are used for this, and so count[] is decremented as codes are
- entered in the tables.
-
- used keeps track of how many table entries have been allocated from the
- provided *table space. It is checked for LENS and DIST tables against
- the constants ENOUGH_LENS and ENOUGH_DISTS to guard against changes in
- the initial root table size constants. See the comments in inftrees.h
- for more information.
-
- sym increments through all symbols, and the loop terminates when
- all codes of length max, i.e. all codes, have been processed. This
- routine permits incomplete codes, so another loop after this one fills
- in the rest of the decoding tables with invalid code markers.
- */
-
- /* set up for code type */
- switch (type) {
- case CODES:
- base = extra = work; /* dummy value--not used */
- match = 20;
- break;
- case LENS:
- base = lbase;
- extra = lext;
- match = 257;
- break;
- default: /* DISTS */
- base = dbase;
- extra = dext;
- match = 0;
- }
-
- /* initialize state for loop */
- huff = 0; /* starting code */
- sym = 0; /* starting code symbol */
- len = min; /* starting code length */
- next = *table; /* current table to fill in */
- curr = root; /* current table index bits */
- drop = 0; /* current bits to drop from code for index */
- low = (unsigned)(-1); /* trigger new sub-table when len > root */
- used = 1U << root; /* use root table entries */
- mask = used - 1; /* mask for comparing low */
-
- /* check available table space */
- if ((type == LENS && used > ENOUGH_LENS) ||
- (type == DISTS && used > ENOUGH_DISTS))
- return 1;
-
- /* process all codes and make table entries */
- for (;;) {
- /* create table entry */
- here.bits = (unsigned char)(len - drop);
- if (work[sym] + 1U < match) {
- here.op = (unsigned char)0;
- here.val = work[sym];
- }
- else if (work[sym] >= match) {
- here.op = (unsigned char)(extra[work[sym] - match]);
- here.val = base[work[sym] - match];
- }
- else {
- here.op = (unsigned char)(32 + 64); /* end of block */
- here.val = 0;
- }
-
- /* replicate for those indices with low len bits equal to huff */
- incr = 1U << (len - drop);
- fill = 1U << curr;
- min = fill; /* save offset to next table */
- do {
- fill -= incr;
- next[(huff >> drop) + fill] = here;
- } while (fill != 0);
-
- /* backwards increment the len-bit code huff */
- incr = 1U << (len - 1);
- while (huff & incr)
- incr >>= 1;
- if (incr != 0) {
- huff &= incr - 1;
- huff += incr;
- }
- else
- huff = 0;
-
- /* go to next symbol, update count, len */
- sym++;
- if (--(count[len]) == 0) {
- if (len == max) break;
- len = lens[work[sym]];
- }
-
- /* create new sub-table if needed */
- if (len > root && (huff & mask) != low) {
- /* if first time, transition to sub-tables */
- if (drop == 0)
- drop = root;
-
- /* increment past last table */
- next += min; /* here min is 1 << curr */
-
- /* determine length of next table */
- curr = len - drop;
- left = (int)(1 << curr);
- while (curr + drop < max) {
- left -= count[curr + drop];
- if (left <= 0) break;
- curr++;
- left <<= 1;
- }
-
- /* check for enough space */
- used += 1U << curr;
- if ((type == LENS && used > ENOUGH_LENS) ||
- (type == DISTS && used > ENOUGH_DISTS))
- return 1;
-
- /* point entry in root table to sub-table */
- low = huff & mask;
- (*table)[low].op = (unsigned char)curr;
- (*table)[low].bits = (unsigned char)root;
- (*table)[low].val = (unsigned short)(next - *table);
- }
- }
-
- /* fill in remaining table entry if code is incomplete (guaranteed to have
- at most one remaining entry, since if the code is incomplete, the
- maximum code length that was allowed to get this far is one bit) */
- if (huff != 0) {
- here.op = (unsigned char)64; /* invalid code marker */
- here.bits = (unsigned char)(len - drop);
- here.val = (unsigned short)0;
- next[huff] = here;
- }
-
- /* set return parameters */
- *table += used;
- *bits = root;
- return 0;
-}
diff --git a/lib/sqfs/comp/zlib/inftrees.h b/lib/sqfs/comp/zlib/inftrees.h
deleted file mode 100644
index baa53a0..0000000
--- a/lib/sqfs/comp/zlib/inftrees.h
+++ /dev/null
@@ -1,62 +0,0 @@
-/* inftrees.h -- header to use inftrees.c
- * Copyright (C) 1995-2005, 2010 Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* WARNING: this file should *not* be used by applications. It is
- part of the implementation of the compression library and is
- subject to change. Applications should only use zlib.h.
- */
-
-/* Structure for decoding tables. Each entry provides either the
- information needed to do the operation requested by the code that
- indexed that table entry, or it provides a pointer to another
- table that indexes more bits of the code. op indicates whether
- the entry is a pointer to another table, a literal, a length or
- distance, an end-of-block, or an invalid code. For a table
- pointer, the low four bits of op is the number of index bits of
- that table. For a length or distance, the low four bits of op
- is the number of extra bits to get after the code. bits is
- the number of bits in this code or part of the code to drop off
- of the bit buffer. val is the actual byte to output in the case
- of a literal, the base length or distance, or the offset from
- the current table to the next table. Each entry is four bytes. */
-typedef struct {
- unsigned char op; /* operation, extra bits, table bits */
- unsigned char bits; /* bits in this part of the code */
- unsigned short val; /* offset in table or code value */
-} code;
-
-/* op values as set by inflate_table():
- 00000000 - literal
- 0000tttt - table link, tttt != 0 is the number of table index bits
- 0001eeee - length or distance, eeee is the number of extra bits
- 01100000 - end of block
- 01000000 - invalid code
- */
-
-/* Maximum size of the dynamic table. The maximum number of code structures is
- 1444, which is the sum of 852 for literal/length codes and 592 for distance
- codes. These values were found by exhaustive searches using the program
- examples/enough.c found in the zlib distribtution. The arguments to that
- program are the number of symbols, the initial root table size, and the
- maximum bit length of a code. "enough 286 9 15" for literal/length codes
- returns returns 852, and "enough 30 6 15" for distance codes returns 592.
- The initial root table size (9 or 6) is found in the fifth argument of the
- inflate_table() calls in inflate.c and infback.c. If the root table size is
- changed, then these maximum sizes would be need to be recalculated and
- updated. */
-#define ENOUGH_LENS 852
-#define ENOUGH_DISTS 592
-#define ENOUGH (ENOUGH_LENS+ENOUGH_DISTS)
-
-/* Type of code to build for inflate_table() */
-typedef enum {
- CODES,
- LENS,
- DISTS
-} codetype;
-
-int ZLIB_INTERNAL inflate_table OF((codetype type, unsigned short FAR *lens,
- unsigned codes, code FAR * FAR *table,
- unsigned FAR *bits, unsigned short FAR *work));
diff --git a/lib/sqfs/comp/zlib/trees.c b/lib/sqfs/comp/zlib/trees.c
deleted file mode 100644
index 50cf4b4..0000000
--- a/lib/sqfs/comp/zlib/trees.c
+++ /dev/null
@@ -1,1203 +0,0 @@
-/* trees.c -- output deflated data using Huffman coding
- * Copyright (C) 1995-2017 Jean-loup Gailly
- * detect_data_type() function provided freely by Cosmin Truta, 2006
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/*
- * ALGORITHM
- *
- * The "deflation" process uses several Huffman trees. The more
- * common source values are represented by shorter bit sequences.
- *
- * Each code tree is stored in a compressed form which is itself
- * a Huffman encoding of the lengths of all the code strings (in
- * ascending order by source values). The actual code strings are
- * reconstructed from the lengths in the inflate process, as described
- * in the deflate specification.
- *
- * REFERENCES
- *
- * Deutsch, L.P.,"'Deflate' Compressed Data Format Specification".
- * Available in ftp.uu.net:/pub/archiving/zip/doc/deflate-1.1.doc
- *
- * Storer, James A.
- * Data Compression: Methods and Theory, pp. 49-50.
- * Computer Science Press, 1988. ISBN 0-7167-8156-5.
- *
- * Sedgewick, R.
- * Algorithms, p290.
- * Addison-Wesley, 1983. ISBN 0-201-06672-6.
- */
-
-/* @(#) $Id$ */
-
-/* #define GEN_TREES_H */
-
-#include "deflate.h"
-
-#ifdef ZLIB_DEBUG
-# include <ctype.h>
-#endif
-
-/* ===========================================================================
- * Constants
- */
-
-#define MAX_BL_BITS 7
-/* Bit length codes must not exceed MAX_BL_BITS bits */
-
-#define END_BLOCK 256
-/* end of block literal code */
-
-#define REP_3_6 16
-/* repeat previous bit length 3-6 times (2 bits of repeat count) */
-
-#define REPZ_3_10 17
-/* repeat a zero length 3-10 times (3 bits of repeat count) */
-
-#define REPZ_11_138 18
-/* repeat a zero length 11-138 times (7 bits of repeat count) */
-
-local const int extra_lbits[LENGTH_CODES] /* extra bits for each length code */
- = {0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0};
-
-local const int extra_dbits[D_CODES] /* extra bits for each distance code */
- = {0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
-
-local const int extra_blbits[BL_CODES]/* extra bits for each bit length code */
- = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7};
-
-local const uch bl_order[BL_CODES]
- = {16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15};
-/* The lengths of the bit length codes are sent in order of decreasing
- * probability, to avoid transmitting the lengths for unused bit length codes.
- */
-
-/* ===========================================================================
- * Local data. These are initialized only once.
- */
-
-#define DIST_CODE_LEN 512 /* see definition of array dist_code below */
-
-#if defined(GEN_TREES_H) || !defined(STDC)
-/* non ANSI compilers may not accept trees.h */
-
-local ct_data static_ltree[L_CODES+2];
-/* The static literal tree. Since the bit lengths are imposed, there is no
- * need for the L_CODES extra codes used during heap construction. However
- * The codes 286 and 287 are needed to build a canonical tree (see _tr_init
- * below).
- */
-
-local ct_data static_dtree[D_CODES];
-/* The static distance tree. (Actually a trivial tree since all codes use
- * 5 bits.)
- */
-
-uch _dist_code[DIST_CODE_LEN];
-/* Distance codes. The first 256 values correspond to the distances
- * 3 .. 258, the last 256 values correspond to the top 8 bits of
- * the 15 bit distances.
- */
-
-uch _length_code[MAX_MATCH-MIN_MATCH+1];
-/* length code for each normalized match length (0 == MIN_MATCH) */
-
-local int base_length[LENGTH_CODES];
-/* First normalized length for each code (0 = MIN_MATCH) */
-
-local int base_dist[D_CODES];
-/* First normalized distance for each code (0 = distance of 1) */
-
-#else
-# include "trees.h"
-#endif /* GEN_TREES_H */
-
-struct static_tree_desc_s {
- const ct_data *static_tree; /* static tree or NULL */
- const intf *extra_bits; /* extra bits for each code or NULL */
- int extra_base; /* base index for extra_bits */
- int elems; /* max number of elements in the tree */
- int max_length; /* max bit length for the codes */
-};
-
-local const static_tree_desc static_l_desc =
-{static_ltree, extra_lbits, LITERALS+1, L_CODES, MAX_BITS};
-
-local const static_tree_desc static_d_desc =
-{static_dtree, extra_dbits, 0, D_CODES, MAX_BITS};
-
-local const static_tree_desc static_bl_desc =
-{(const ct_data *)0, extra_blbits, 0, BL_CODES, MAX_BL_BITS};
-
-/* ===========================================================================
- * Local (static) routines in this file.
- */
-
-local void tr_static_init OF((void));
-local void init_block OF((deflate_state *s));
-local void pqdownheap OF((deflate_state *s, ct_data *tree, int k));
-local void gen_bitlen OF((deflate_state *s, tree_desc *desc));
-local void gen_codes OF((ct_data *tree, int max_code, ushf *bl_count));
-local void build_tree OF((deflate_state *s, tree_desc *desc));
-local void scan_tree OF((deflate_state *s, ct_data *tree, int max_code));
-local void send_tree OF((deflate_state *s, ct_data *tree, int max_code));
-local int build_bl_tree OF((deflate_state *s));
-local void send_all_trees OF((deflate_state *s, int lcodes, int dcodes,
- int blcodes));
-local void compress_block OF((deflate_state *s, const ct_data *ltree,
- const ct_data *dtree));
-local int detect_data_type OF((deflate_state *s));
-local unsigned bi_reverse OF((unsigned value, int length));
-local void bi_windup OF((deflate_state *s));
-local void bi_flush OF((deflate_state *s));
-
-#ifdef GEN_TREES_H
-local void gen_trees_header OF((void));
-#endif
-
-#ifndef ZLIB_DEBUG
-# define send_code(s, c, tree) send_bits(s, tree[c].Code, tree[c].Len)
- /* Send a code of the given tree. c and tree must not have side effects */
-
-#else /* !ZLIB_DEBUG */
-# define send_code(s, c, tree) \
- { if (z_verbose>2) fprintf(stderr,"\ncd %3d ",(c)); \
- send_bits(s, tree[c].Code, tree[c].Len); }
-#endif
-
-/* ===========================================================================
- * Output a short LSB first on the stream.
- * IN assertion: there is enough room in pendingBuf.
- */
-#define put_short(s, w) { \
- put_byte(s, (uch)((w) & 0xff)); \
- put_byte(s, (uch)((ush)(w) >> 8)); \
-}
-
-/* ===========================================================================
- * Send a value on a given number of bits.
- * IN assertion: length <= 16 and value fits in length bits.
- */
-#ifdef ZLIB_DEBUG
-local void send_bits OF((deflate_state *s, int value, int length));
-
-local void send_bits(s, value, length)
- deflate_state *s;
- int value; /* value to send */
- int length; /* number of bits */
-{
- Tracevv((stderr," l %2d v %4x ", length, value));
- Assert(length > 0 && length <= 15, "invalid length");
- s->bits_sent += (ulg)length;
-
- /* If not enough room in bi_buf, use (valid) bits from bi_buf and
- * (16 - bi_valid) bits from value, leaving (width - (16-bi_valid))
- * unused bits in value.
- */
- if (s->bi_valid > (int)Buf_size - length) {
- s->bi_buf |= (ush)value << s->bi_valid;
- put_short(s, s->bi_buf);
- s->bi_buf = (ush)value >> (Buf_size - s->bi_valid);
- s->bi_valid += length - Buf_size;
- } else {
- s->bi_buf |= (ush)value << s->bi_valid;
- s->bi_valid += length;
- }
-}
-#else /* !ZLIB_DEBUG */
-
-#define send_bits(s, value, length) \
-{ int len = length;\
- if (s->bi_valid > (int)Buf_size - len) {\
- int val = (int)value;\
- s->bi_buf |= (ush)val << s->bi_valid;\
- put_short(s, s->bi_buf);\
- s->bi_buf = (ush)val >> (Buf_size - s->bi_valid);\
- s->bi_valid += len - Buf_size;\
- } else {\
- s->bi_buf |= (ush)(value) << s->bi_valid;\
- s->bi_valid += len;\
- }\
-}
-#endif /* ZLIB_DEBUG */
-
-
-/* the arguments must not have side effects */
-
-/* ===========================================================================
- * Initialize the various 'constant' tables.
- */
-local void tr_static_init()
-{
-#if defined(GEN_TREES_H) || !defined(STDC)
- static int static_init_done = 0;
- int n; /* iterates over tree elements */
- int bits; /* bit counter */
- int length; /* length value */
- int code; /* code value */
- int dist; /* distance index */
- ush bl_count[MAX_BITS+1];
- /* number of codes at each bit length for an optimal tree */
-
- if (static_init_done) return;
-
- /* For some embedded targets, global variables are not initialized: */
-#ifdef NO_INIT_GLOBAL_POINTERS
- static_l_desc.static_tree = static_ltree;
- static_l_desc.extra_bits = extra_lbits;
- static_d_desc.static_tree = static_dtree;
- static_d_desc.extra_bits = extra_dbits;
- static_bl_desc.extra_bits = extra_blbits;
-#endif
-
- /* Initialize the mapping length (0..255) -> length code (0..28) */
- length = 0;
- for (code = 0; code < LENGTH_CODES-1; code++) {
- base_length[code] = length;
- for (n = 0; n < (1<<extra_lbits[code]); n++) {
- _length_code[length++] = (uch)code;
- }
- }
- Assert (length == 256, "tr_static_init: length != 256");
- /* Note that the length 255 (match length 258) can be represented
- * in two different ways: code 284 + 5 bits or code 285, so we
- * overwrite length_code[255] to use the best encoding:
- */
- _length_code[length-1] = (uch)code;
-
- /* Initialize the mapping dist (0..32K) -> dist code (0..29) */
- dist = 0;
- for (code = 0 ; code < 16; code++) {
- base_dist[code] = dist;
- for (n = 0; n < (1<<extra_dbits[code]); n++) {
- _dist_code[dist++] = (uch)code;
- }
- }
- Assert (dist == 256, "tr_static_init: dist != 256");
- dist >>= 7; /* from now on, all distances are divided by 128 */
- for ( ; code < D_CODES; code++) {
- base_dist[code] = dist << 7;
- for (n = 0; n < (1<<(extra_dbits[code]-7)); n++) {
- _dist_code[256 + dist++] = (uch)code;
- }
- }
- Assert (dist == 256, "tr_static_init: 256+dist != 512");
-
- /* Construct the codes of the static literal tree */
- for (bits = 0; bits <= MAX_BITS; bits++) bl_count[bits] = 0;
- n = 0;
- while (n <= 143) static_ltree[n++].Len = 8, bl_count[8]++;
- while (n <= 255) static_ltree[n++].Len = 9, bl_count[9]++;
- while (n <= 279) static_ltree[n++].Len = 7, bl_count[7]++;
- while (n <= 287) static_ltree[n++].Len = 8, bl_count[8]++;
- /* Codes 286 and 287 do not exist, but we must include them in the
- * tree construction to get a canonical Huffman tree (longest code
- * all ones)
- */
- gen_codes((ct_data *)static_ltree, L_CODES+1, bl_count);
-
- /* The static distance tree is trivial: */
- for (n = 0; n < D_CODES; n++) {
- static_dtree[n].Len = 5;
- static_dtree[n].Code = bi_reverse((unsigned)n, 5);
- }
- static_init_done = 1;
-
-# ifdef GEN_TREES_H
- gen_trees_header();
-# endif
-#endif /* defined(GEN_TREES_H) || !defined(STDC) */
-}
-
-/* ===========================================================================
- * Genererate the file trees.h describing the static trees.
- */
-#ifdef GEN_TREES_H
-# ifndef ZLIB_DEBUG
-# include <stdio.h>
-# endif
-
-# define SEPARATOR(i, last, width) \
- ((i) == (last)? "\n};\n\n" : \
- ((i) % (width) == (width)-1 ? ",\n" : ", "))
-
-void gen_trees_header()
-{
- FILE *header = fopen("trees.h", "w");
- int i;
-
- Assert (header != NULL, "Can't open trees.h");
- fprintf(header,
- "/* header created automatically with -DGEN_TREES_H */\n\n");
-
- fprintf(header, "local const ct_data static_ltree[L_CODES+2] = {\n");
- for (i = 0; i < L_CODES+2; i++) {
- fprintf(header, "{{%3u},{%3u}}%s", static_ltree[i].Code,
- static_ltree[i].Len, SEPARATOR(i, L_CODES+1, 5));
- }
-
- fprintf(header, "local const ct_data static_dtree[D_CODES] = {\n");
- for (i = 0; i < D_CODES; i++) {
- fprintf(header, "{{%2u},{%2u}}%s", static_dtree[i].Code,
- static_dtree[i].Len, SEPARATOR(i, D_CODES-1, 5));
- }
-
- fprintf(header, "const uch ZLIB_INTERNAL _dist_code[DIST_CODE_LEN] = {\n");
- for (i = 0; i < DIST_CODE_LEN; i++) {
- fprintf(header, "%2u%s", _dist_code[i],
- SEPARATOR(i, DIST_CODE_LEN-1, 20));
- }
-
- fprintf(header,
- "const uch ZLIB_INTERNAL _length_code[MAX_MATCH-MIN_MATCH+1]= {\n");
- for (i = 0; i < MAX_MATCH-MIN_MATCH+1; i++) {
- fprintf(header, "%2u%s", _length_code[i],
- SEPARATOR(i, MAX_MATCH-MIN_MATCH, 20));
- }
-
- fprintf(header, "local const int base_length[LENGTH_CODES] = {\n");
- for (i = 0; i < LENGTH_CODES; i++) {
- fprintf(header, "%1u%s", base_length[i],
- SEPARATOR(i, LENGTH_CODES-1, 20));
- }
-
- fprintf(header, "local const int base_dist[D_CODES] = {\n");
- for (i = 0; i < D_CODES; i++) {
- fprintf(header, "%5u%s", base_dist[i],
- SEPARATOR(i, D_CODES-1, 10));
- }
-
- fclose(header);
-}
-#endif /* GEN_TREES_H */
-
-/* ===========================================================================
- * Initialize the tree data structures for a new zlib stream.
- */
-void ZLIB_INTERNAL _tr_init(s)
- deflate_state *s;
-{
- tr_static_init();
-
- s->l_desc.dyn_tree = s->dyn_ltree;
- s->l_desc.stat_desc = &static_l_desc;
-
- s->d_desc.dyn_tree = s->dyn_dtree;
- s->d_desc.stat_desc = &static_d_desc;
-
- s->bl_desc.dyn_tree = s->bl_tree;
- s->bl_desc.stat_desc = &static_bl_desc;
-
- s->bi_buf = 0;
- s->bi_valid = 0;
-#ifdef ZLIB_DEBUG
- s->compressed_len = 0L;
- s->bits_sent = 0L;
-#endif
-
- /* Initialize the first block of the first file: */
- init_block(s);
-}
-
-/* ===========================================================================
- * Initialize a new block.
- */
-local void init_block(s)
- deflate_state *s;
-{
- int n; /* iterates over tree elements */
-
- /* Initialize the trees. */
- for (n = 0; n < L_CODES; n++) s->dyn_ltree[n].Freq = 0;
- for (n = 0; n < D_CODES; n++) s->dyn_dtree[n].Freq = 0;
- for (n = 0; n < BL_CODES; n++) s->bl_tree[n].Freq = 0;
-
- s->dyn_ltree[END_BLOCK].Freq = 1;
- s->opt_len = s->static_len = 0L;
- s->last_lit = s->matches = 0;
-}
-
-#define SMALLEST 1
-/* Index within the heap array of least frequent node in the Huffman tree */
-
-
-/* ===========================================================================
- * Remove the smallest element from the heap and recreate the heap with
- * one less element. Updates heap and heap_len.
- */
-#define pqremove(s, tree, top) \
-{\
- top = s->heap[SMALLEST]; \
- s->heap[SMALLEST] = s->heap[s->heap_len--]; \
- pqdownheap(s, tree, SMALLEST); \
-}
-
-/* ===========================================================================
- * Compares to subtrees, using the tree depth as tie breaker when
- * the subtrees have equal frequency. This minimizes the worst case length.
- */
-#define smaller(tree, n, m, depth) \
- (tree[n].Freq < tree[m].Freq || \
- (tree[n].Freq == tree[m].Freq && depth[n] <= depth[m]))
-
-/* ===========================================================================
- * Restore the heap property by moving down the tree starting at node k,
- * exchanging a node with the smallest of its two sons if necessary, stopping
- * when the heap property is re-established (each father smaller than its
- * two sons).
- */
-local void pqdownheap(s, tree, k)
- deflate_state *s;
- ct_data *tree; /* the tree to restore */
- int k; /* node to move down */
-{
- int v = s->heap[k];
- int j = k << 1; /* left son of k */
- while (j <= s->heap_len) {
- /* Set j to the smallest of the two sons: */
- if (j < s->heap_len &&
- smaller(tree, s->heap[j+1], s->heap[j], s->depth)) {
- j++;
- }
- /* Exit if v is smaller than both sons */
- if (smaller(tree, v, s->heap[j], s->depth)) break;
-
- /* Exchange v with the smallest son */
- s->heap[k] = s->heap[j]; k = j;
-
- /* And continue down the tree, setting j to the left son of k */
- j <<= 1;
- }
- s->heap[k] = v;
-}
-
-/* ===========================================================================
- * Compute the optimal bit lengths for a tree and update the total bit length
- * for the current block.
- * IN assertion: the fields freq and dad are set, heap[heap_max] and
- * above are the tree nodes sorted by increasing frequency.
- * OUT assertions: the field len is set to the optimal bit length, the
- * array bl_count contains the frequencies for each bit length.
- * The length opt_len is updated; static_len is also updated if stree is
- * not null.
- */
-local void gen_bitlen(s, desc)
- deflate_state *s;
- tree_desc *desc; /* the tree descriptor */
-{
- ct_data *tree = desc->dyn_tree;
- int max_code = desc->max_code;
- const ct_data *stree = desc->stat_desc->static_tree;
- const intf *extra = desc->stat_desc->extra_bits;
- int base = desc->stat_desc->extra_base;
- int max_length = desc->stat_desc->max_length;
- int h; /* heap index */
- int n, m; /* iterate over the tree elements */
- int bits; /* bit length */
- int xbits; /* extra bits */
- ush f; /* frequency */
- int overflow = 0; /* number of elements with bit length too large */
-
- for (bits = 0; bits <= MAX_BITS; bits++) s->bl_count[bits] = 0;
-
- /* In a first pass, compute the optimal bit lengths (which may
- * overflow in the case of the bit length tree).
- */
- tree[s->heap[s->heap_max]].Len = 0; /* root of the heap */
-
- for (h = s->heap_max+1; h < HEAP_SIZE; h++) {
- n = s->heap[h];
- bits = tree[tree[n].Dad].Len + 1;
- if (bits > max_length) bits = max_length, overflow++;
- tree[n].Len = (ush)bits;
- /* We overwrite tree[n].Dad which is no longer needed */
-
- if (n > max_code) continue; /* not a leaf node */
-
- s->bl_count[bits]++;
- xbits = 0;
- if (n >= base) xbits = extra[n-base];
- f = tree[n].Freq;
- s->opt_len += (ulg)f * (unsigned)(bits + xbits);
- if (stree) s->static_len += (ulg)f * (unsigned)(stree[n].Len + xbits);
- }
- if (overflow == 0) return;
-
- Tracev((stderr,"\nbit length overflow\n"));
- /* This happens for example on obj2 and pic of the Calgary corpus */
-
- /* Find the first bit length which could increase: */
- do {
- bits = max_length-1;
- while (s->bl_count[bits] == 0) bits--;
- s->bl_count[bits]--; /* move one leaf down the tree */
- s->bl_count[bits+1] += 2; /* move one overflow item as its brother */
- s->bl_count[max_length]--;
- /* The brother of the overflow item also moves one step up,
- * but this does not affect bl_count[max_length]
- */
- overflow -= 2;
- } while (overflow > 0);
-
- /* Now recompute all bit lengths, scanning in increasing frequency.
- * h is still equal to HEAP_SIZE. (It is simpler to reconstruct all
- * lengths instead of fixing only the wrong ones. This idea is taken
- * from 'ar' written by Haruhiko Okumura.)
- */
- for (bits = max_length; bits != 0; bits--) {
- n = s->bl_count[bits];
- while (n != 0) {
- m = s->heap[--h];
- if (m > max_code) continue;
- if ((unsigned) tree[m].Len != (unsigned) bits) {
- Tracev((stderr,"code %d bits %d->%d\n", m, tree[m].Len, bits));
- s->opt_len += ((ulg)bits - tree[m].Len) * tree[m].Freq;
- tree[m].Len = (ush)bits;
- }
- n--;
- }
- }
-}
-
-/* ===========================================================================
- * Generate the codes for a given tree and bit counts (which need not be
- * optimal).
- * IN assertion: the array bl_count contains the bit length statistics for
- * the given tree and the field len is set for all tree elements.
- * OUT assertion: the field code is set for all tree elements of non
- * zero code length.
- */
-local void gen_codes (tree, max_code, bl_count)
- ct_data *tree; /* the tree to decorate */
- int max_code; /* largest code with non zero frequency */
- ushf *bl_count; /* number of codes at each bit length */
-{
- ush next_code[MAX_BITS+1]; /* next code value for each bit length */
- unsigned code = 0; /* running code value */
- int bits; /* bit index */
- int n; /* code index */
-
- /* The distribution counts are first used to generate the code values
- * without bit reversal.
- */
- for (bits = 1; bits <= MAX_BITS; bits++) {
- code = (code + bl_count[bits-1]) << 1;
- next_code[bits] = (ush)code;
- }
- /* Check that the bit counts in bl_count are consistent. The last code
- * must be all ones.
- */
- Assert (code + bl_count[MAX_BITS]-1 == (1<<MAX_BITS)-1,
- "inconsistent bit counts");
- Tracev((stderr,"\ngen_codes: max_code %d ", max_code));
-
- for (n = 0; n <= max_code; n++) {
- int len = tree[n].Len;
- if (len == 0) continue;
- /* Now reverse the bits */
- tree[n].Code = (ush)bi_reverse(next_code[len]++, len);
-
- Tracecv(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
- n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1));
- }
-}
-
-/* ===========================================================================
- * Construct one Huffman tree and assigns the code bit strings and lengths.
- * Update the total bit length for the current block.
- * IN assertion: the field freq is set for all tree elements.
- * OUT assertions: the fields len and code are set to the optimal bit length
- * and corresponding code. The length opt_len is updated; static_len is
- * also updated if stree is not null. The field max_code is set.
- */
-local void build_tree(s, desc)
- deflate_state *s;
- tree_desc *desc; /* the tree descriptor */
-{
- ct_data *tree = desc->dyn_tree;
- const ct_data *stree = desc->stat_desc->static_tree;
- int elems = desc->stat_desc->elems;
- int n, m; /* iterate over heap elements */
- int max_code = -1; /* largest code with non zero frequency */
- int node; /* new node being created */
-
- /* Construct the initial heap, with least frequent element in
- * heap[SMALLEST]. The sons of heap[n] are heap[2*n] and heap[2*n+1].
- * heap[0] is not used.
- */
- s->heap_len = 0, s->heap_max = HEAP_SIZE;
-
- for (n = 0; n < elems; n++) {
- if (tree[n].Freq != 0) {
- s->heap[++(s->heap_len)] = max_code = n;
- s->depth[n] = 0;
- } else {
- tree[n].Len = 0;
- }
- }
-
- /* The pkzip format requires that at least one distance code exists,
- * and that at least one bit should be sent even if there is only one
- * possible code. So to avoid special checks later on we force at least
- * two codes of non zero frequency.
- */
- while (s->heap_len < 2) {
- node = s->heap[++(s->heap_len)] = (max_code < 2 ? ++max_code : 0);
- tree[node].Freq = 1;
- s->depth[node] = 0;
- s->opt_len--; if (stree) s->static_len -= stree[node].Len;
- /* node is 0 or 1 so it does not have extra bits */
- }
- desc->max_code = max_code;
-
- /* The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree,
- * establish sub-heaps of increasing lengths:
- */
- for (n = s->heap_len/2; n >= 1; n--) pqdownheap(s, tree, n);
-
- /* Construct the Huffman tree by repeatedly combining the least two
- * frequent nodes.
- */
- node = elems; /* next internal node of the tree */
- do {
- pqremove(s, tree, n); /* n = node of least frequency */
- m = s->heap[SMALLEST]; /* m = node of next least frequency */
-
- s->heap[--(s->heap_max)] = n; /* keep the nodes sorted by frequency */
- s->heap[--(s->heap_max)] = m;
-
- /* Create a new node father of n and m */
- tree[node].Freq = tree[n].Freq + tree[m].Freq;
- s->depth[node] = (uch)((s->depth[n] >= s->depth[m] ?
- s->depth[n] : s->depth[m]) + 1);
- tree[n].Dad = tree[m].Dad = (ush)node;
-#ifdef DUMP_BL_TREE
- if (tree == s->bl_tree) {
- fprintf(stderr,"\nnode %d(%d), sons %d(%d) %d(%d)",
- node, tree[node].Freq, n, tree[n].Freq, m, tree[m].Freq);
- }
-#endif
- /* and insert the new node in the heap */
- s->heap[SMALLEST] = node++;
- pqdownheap(s, tree, SMALLEST);
-
- } while (s->heap_len >= 2);
-
- s->heap[--(s->heap_max)] = s->heap[SMALLEST];
-
- /* At this point, the fields freq and dad are set. We can now
- * generate the bit lengths.
- */
- gen_bitlen(s, (tree_desc *)desc);
-
- /* The field len is now set, we can generate the bit codes */
- gen_codes ((ct_data *)tree, max_code, s->bl_count);
-}
-
-/* ===========================================================================
- * Scan a literal or distance tree to determine the frequencies of the codes
- * in the bit length tree.
- */
-local void scan_tree (s, tree, max_code)
- deflate_state *s;
- ct_data *tree; /* the tree to be scanned */
- int max_code; /* and its largest code of non zero frequency */
-{
- int n; /* iterates over all tree elements */
- int prevlen = -1; /* last emitted length */
- int curlen; /* length of current code */
- int nextlen = tree[0].Len; /* length of next code */
- int count = 0; /* repeat count of the current code */
- int max_count = 7; /* max repeat count */
- int min_count = 4; /* min repeat count */
-
- if (nextlen == 0) max_count = 138, min_count = 3;
- tree[max_code+1].Len = (ush)0xffff; /* guard */
-
- for (n = 0; n <= max_code; n++) {
- curlen = nextlen; nextlen = tree[n+1].Len;
- if (++count < max_count && curlen == nextlen) {
- continue;
- } else if (count < min_count) {
- s->bl_tree[curlen].Freq += count;
- } else if (curlen != 0) {
- if (curlen != prevlen) s->bl_tree[curlen].Freq++;
- s->bl_tree[REP_3_6].Freq++;
- } else if (count <= 10) {
- s->bl_tree[REPZ_3_10].Freq++;
- } else {
- s->bl_tree[REPZ_11_138].Freq++;
- }
- count = 0; prevlen = curlen;
- if (nextlen == 0) {
- max_count = 138, min_count = 3;
- } else if (curlen == nextlen) {
- max_count = 6, min_count = 3;
- } else {
- max_count = 7, min_count = 4;
- }
- }
-}
-
-/* ===========================================================================
- * Send a literal or distance tree in compressed form, using the codes in
- * bl_tree.
- */
-local void send_tree (s, tree, max_code)
- deflate_state *s;
- ct_data *tree; /* the tree to be scanned */
- int max_code; /* and its largest code of non zero frequency */
-{
- int n; /* iterates over all tree elements */
- int prevlen = -1; /* last emitted length */
- int curlen; /* length of current code */
- int nextlen = tree[0].Len; /* length of next code */
- int count = 0; /* repeat count of the current code */
- int max_count = 7; /* max repeat count */
- int min_count = 4; /* min repeat count */
-
- /* tree[max_code+1].Len = -1; */ /* guard already set */
- if (nextlen == 0) max_count = 138, min_count = 3;
-
- for (n = 0; n <= max_code; n++) {
- curlen = nextlen; nextlen = tree[n+1].Len;
- if (++count < max_count && curlen == nextlen) {
- continue;
- } else if (count < min_count) {
- do { send_code(s, curlen, s->bl_tree); } while (--count != 0);
-
- } else if (curlen != 0) {
- if (curlen != prevlen) {
- send_code(s, curlen, s->bl_tree); count--;
- }
- Assert(count >= 3 && count <= 6, " 3_6?");
- send_code(s, REP_3_6, s->bl_tree); send_bits(s, count-3, 2);
-
- } else if (count <= 10) {
- send_code(s, REPZ_3_10, s->bl_tree); send_bits(s, count-3, 3);
-
- } else {
- send_code(s, REPZ_11_138, s->bl_tree); send_bits(s, count-11, 7);
- }
- count = 0; prevlen = curlen;
- if (nextlen == 0) {
- max_count = 138, min_count = 3;
- } else if (curlen == nextlen) {
- max_count = 6, min_count = 3;
- } else {
- max_count = 7, min_count = 4;
- }
- }
-}
-
-/* ===========================================================================
- * Construct the Huffman tree for the bit lengths and return the index in
- * bl_order of the last bit length code to send.
- */
-local int build_bl_tree(s)
- deflate_state *s;
-{
- int max_blindex; /* index of last bit length code of non zero freq */
-
- /* Determine the bit length frequencies for literal and distance trees */
- scan_tree(s, (ct_data *)s->dyn_ltree, s->l_desc.max_code);
- scan_tree(s, (ct_data *)s->dyn_dtree, s->d_desc.max_code);
-
- /* Build the bit length tree: */
- build_tree(s, (tree_desc *)(&(s->bl_desc)));
- /* opt_len now includes the length of the tree representations, except
- * the lengths of the bit lengths codes and the 5+5+4 bits for the counts.
- */
-
- /* Determine the number of bit length codes to send. The pkzip format
- * requires that at least 4 bit length codes be sent. (appnote.txt says
- * 3 but the actual value used is 4.)
- */
- for (max_blindex = BL_CODES-1; max_blindex >= 3; max_blindex--) {
- if (s->bl_tree[bl_order[max_blindex]].Len != 0) break;
- }
- /* Update opt_len to include the bit length tree and counts */
- s->opt_len += 3*((ulg)max_blindex+1) + 5+5+4;
- Tracev((stderr, "\ndyn trees: dyn %ld, stat %ld",
- s->opt_len, s->static_len));
-
- return max_blindex;
-}
-
-/* ===========================================================================
- * Send the header for a block using dynamic Huffman trees: the counts, the
- * lengths of the bit length codes, the literal tree and the distance tree.
- * IN assertion: lcodes >= 257, dcodes >= 1, blcodes >= 4.
- */
-local void send_all_trees(s, lcodes, dcodes, blcodes)
- deflate_state *s;
- int lcodes, dcodes, blcodes; /* number of codes for each tree */
-{
- int rank; /* index in bl_order */
-
- Assert (lcodes >= 257 && dcodes >= 1 && blcodes >= 4, "not enough codes");
- Assert (lcodes <= L_CODES && dcodes <= D_CODES && blcodes <= BL_CODES,
- "too many codes");
- Tracev((stderr, "\nbl counts: "));
- send_bits(s, lcodes-257, 5); /* not +255 as stated in appnote.txt */
- send_bits(s, dcodes-1, 5);
- send_bits(s, blcodes-4, 4); /* not -3 as stated in appnote.txt */
- for (rank = 0; rank < blcodes; rank++) {
- Tracev((stderr, "\nbl code %2d ", bl_order[rank]));
- send_bits(s, s->bl_tree[bl_order[rank]].Len, 3);
- }
- Tracev((stderr, "\nbl tree: sent %ld", s->bits_sent));
-
- send_tree(s, (ct_data *)s->dyn_ltree, lcodes-1); /* literal tree */
- Tracev((stderr, "\nlit tree: sent %ld", s->bits_sent));
-
- send_tree(s, (ct_data *)s->dyn_dtree, dcodes-1); /* distance tree */
- Tracev((stderr, "\ndist tree: sent %ld", s->bits_sent));
-}
-
-/* ===========================================================================
- * Send a stored block
- */
-void ZLIB_INTERNAL _tr_stored_block(s, buf, stored_len, last)
- deflate_state *s;
- charf *buf; /* input block */
- ulg stored_len; /* length of input block */
- int last; /* one if this is the last block for a file */
-{
- send_bits(s, (STORED_BLOCK<<1)+last, 3); /* send block type */
- bi_windup(s); /* align on byte boundary */
- put_short(s, (ush)stored_len);
- put_short(s, (ush)~stored_len);
- zmemcpy(s->pending_buf + s->pending, (Bytef *)buf, stored_len);
- s->pending += stored_len;
-#ifdef ZLIB_DEBUG
- s->compressed_len = (s->compressed_len + 3 + 7) & (ulg)~7L;
- s->compressed_len += (stored_len + 4) << 3;
- s->bits_sent += 2*16;
- s->bits_sent += stored_len<<3;
-#endif
-}
-
-/* ===========================================================================
- * Flush the bits in the bit buffer to pending output (leaves at most 7 bits)
- */
-void ZLIB_INTERNAL _tr_flush_bits(s)
- deflate_state *s;
-{
- bi_flush(s);
-}
-
-/* ===========================================================================
- * Send one empty static block to give enough lookahead for inflate.
- * This takes 10 bits, of which 7 may remain in the bit buffer.
- */
-void ZLIB_INTERNAL _tr_align(s)
- deflate_state *s;
-{
- send_bits(s, STATIC_TREES<<1, 3);
- send_code(s, END_BLOCK, static_ltree);
-#ifdef ZLIB_DEBUG
- s->compressed_len += 10L; /* 3 for block type, 7 for EOB */
-#endif
- bi_flush(s);
-}
-
-/* ===========================================================================
- * Determine the best encoding for the current block: dynamic trees, static
- * trees or store, and write out the encoded block.
- */
-void ZLIB_INTERNAL _tr_flush_block(s, buf, stored_len, last)
- deflate_state *s;
- charf *buf; /* input block, or NULL if too old */
- ulg stored_len; /* length of input block */
- int last; /* one if this is the last block for a file */
-{
- ulg opt_lenb, static_lenb; /* opt_len and static_len in bytes */
- int max_blindex = 0; /* index of last bit length code of non zero freq */
-
- /* Build the Huffman trees unless a stored block is forced */
- if (s->level > 0) {
-
- /* Check if the file is binary or text */
- if (s->strm->data_type == Z_UNKNOWN)
- s->strm->data_type = detect_data_type(s);
-
- /* Construct the literal and distance trees */
- build_tree(s, (tree_desc *)(&(s->l_desc)));
- Tracev((stderr, "\nlit data: dyn %ld, stat %ld", s->opt_len,
- s->static_len));
-
- build_tree(s, (tree_desc *)(&(s->d_desc)));
- Tracev((stderr, "\ndist data: dyn %ld, stat %ld", s->opt_len,
- s->static_len));
- /* At this point, opt_len and static_len are the total bit lengths of
- * the compressed block data, excluding the tree representations.
- */
-
- /* Build the bit length tree for the above two trees, and get the index
- * in bl_order of the last bit length code to send.
- */
- max_blindex = build_bl_tree(s);
-
- /* Determine the best encoding. Compute the block lengths in bytes. */
- opt_lenb = (s->opt_len+3+7)>>3;
- static_lenb = (s->static_len+3+7)>>3;
-
- Tracev((stderr, "\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u ",
- opt_lenb, s->opt_len, static_lenb, s->static_len, stored_len,
- s->last_lit));
-
- if (static_lenb <= opt_lenb) opt_lenb = static_lenb;
-
- } else {
- Assert(buf != (char*)0, "lost buf");
- opt_lenb = static_lenb = stored_len + 5; /* force a stored block */
- }
-
-#ifdef FORCE_STORED
- if (buf != (char*)0) { /* force stored block */
-#else
- if (stored_len+4 <= opt_lenb && buf != (char*)0) {
- /* 4: two words for the lengths */
-#endif
- /* The test buf != NULL is only necessary if LIT_BUFSIZE > WSIZE.
- * Otherwise we can't have processed more than WSIZE input bytes since
- * the last block flush, because compression would have been
- * successful. If LIT_BUFSIZE <= WSIZE, it is never too late to
- * transform a block into a stored block.
- */
- _tr_stored_block(s, buf, stored_len, last);
-
-#ifdef FORCE_STATIC
- } else if (static_lenb >= 0) { /* force static trees */
-#else
- } else if (s->strategy == Z_FIXED || static_lenb == opt_lenb) {
-#endif
- send_bits(s, (STATIC_TREES<<1)+last, 3);
- compress_block(s, (const ct_data *)static_ltree,
- (const ct_data *)static_dtree);
-#ifdef ZLIB_DEBUG
- s->compressed_len += 3 + s->static_len;
-#endif
- } else {
- send_bits(s, (DYN_TREES<<1)+last, 3);
- send_all_trees(s, s->l_desc.max_code+1, s->d_desc.max_code+1,
- max_blindex+1);
- compress_block(s, (const ct_data *)s->dyn_ltree,
- (const ct_data *)s->dyn_dtree);
-#ifdef ZLIB_DEBUG
- s->compressed_len += 3 + s->opt_len;
-#endif
- }
- Assert (s->compressed_len == s->bits_sent, "bad compressed size");
- /* The above check is made mod 2^32, for files larger than 512 MB
- * and uLong implemented on 32 bits.
- */
- init_block(s);
-
- if (last) {
- bi_windup(s);
-#ifdef ZLIB_DEBUG
- s->compressed_len += 7; /* align on byte boundary */
-#endif
- }
- Tracev((stderr,"\ncomprlen %lu(%lu) ", s->compressed_len>>3,
- s->compressed_len-7*last));
-}
-
-/* ===========================================================================
- * Save the match info and tally the frequency counts. Return true if
- * the current block must be flushed.
- */
-int ZLIB_INTERNAL _tr_tally (s, dist, lc)
- deflate_state *s;
- unsigned dist; /* distance of matched string */
- unsigned lc; /* match length-MIN_MATCH or unmatched char (if dist==0) */
-{
- s->d_buf[s->last_lit] = (ush)dist;
- s->l_buf[s->last_lit++] = (uch)lc;
- if (dist == 0) {
- /* lc is the unmatched char */
- s->dyn_ltree[lc].Freq++;
- } else {
- s->matches++;
- /* Here, lc is the match length - MIN_MATCH */
- dist--; /* dist = match distance - 1 */
- Assert((ush)dist < (ush)MAX_DIST(s) &&
- (ush)lc <= (ush)(MAX_MATCH-MIN_MATCH) &&
- (ush)d_code(dist) < (ush)D_CODES, "_tr_tally: bad match");
-
- s->dyn_ltree[_length_code[lc]+LITERALS+1].Freq++;
- s->dyn_dtree[d_code(dist)].Freq++;
- }
-
-#ifdef TRUNCATE_BLOCK
- /* Try to guess if it is profitable to stop the current block here */
- if ((s->last_lit & 0x1fff) == 0 && s->level > 2) {
- /* Compute an upper bound for the compressed length */
- ulg out_length = (ulg)s->last_lit*8L;
- ulg in_length = (ulg)((long)s->strstart - s->block_start);
- int dcode;
- for (dcode = 0; dcode < D_CODES; dcode++) {
- out_length += (ulg)s->dyn_dtree[dcode].Freq *
- (5L+extra_dbits[dcode]);
- }
- out_length >>= 3;
- Tracev((stderr,"\nlast_lit %u, in %ld, out ~%ld(%ld%%) ",
- s->last_lit, in_length, out_length,
- 100L - out_length*100L/in_length));
- if (s->matches < s->last_lit/2 && out_length < in_length/2) return 1;
- }
-#endif
- return (s->last_lit == s->lit_bufsize-1);
- /* We avoid equality with lit_bufsize because of wraparound at 64K
- * on 16 bit machines and because stored blocks are restricted to
- * 64K-1 bytes.
- */
-}
-
-/* ===========================================================================
- * Send the block data compressed using the given Huffman trees
- */
-local void compress_block(s, ltree, dtree)
- deflate_state *s;
- const ct_data *ltree; /* literal tree */
- const ct_data *dtree; /* distance tree */
-{
- unsigned dist; /* distance of matched string */
- int lc; /* match length or unmatched char (if dist == 0) */
- unsigned lx = 0; /* running index in l_buf */
- unsigned code; /* the code to send */
- int extra; /* number of extra bits to send */
-
- if (s->last_lit != 0) do {
- dist = s->d_buf[lx];
- lc = s->l_buf[lx++];
- if (dist == 0) {
- send_code(s, lc, ltree); /* send a literal byte */
- Tracecv(isgraph(lc), (stderr," '%c' ", lc));
- } else {
- /* Here, lc is the match length - MIN_MATCH */
- code = _length_code[lc];
- send_code(s, code+LITERALS+1, ltree); /* send the length code */
- extra = extra_lbits[code];
- if (extra != 0) {
- lc -= base_length[code];
- send_bits(s, lc, extra); /* send the extra length bits */
- }
- dist--; /* dist is now the match distance - 1 */
- code = d_code(dist);
- Assert (code < D_CODES, "bad d_code");
-
- send_code(s, code, dtree); /* send the distance code */
- extra = extra_dbits[code];
- if (extra != 0) {
- dist -= (unsigned)base_dist[code];
- send_bits(s, dist, extra); /* send the extra distance bits */
- }
- } /* literal or match pair ? */
-
- /* Check that the overlay between pending_buf and d_buf+l_buf is ok: */
- Assert((uInt)(s->pending) < s->lit_bufsize + 2*lx,
- "pendingBuf overflow");
-
- } while (lx < s->last_lit);
-
- send_code(s, END_BLOCK, ltree);
-}
-
-/* ===========================================================================
- * Check if the data type is TEXT or BINARY, using the following algorithm:
- * - TEXT if the two conditions below are satisfied:
- * a) There are no non-portable control characters belonging to the
- * "black list" (0..6, 14..25, 28..31).
- * b) There is at least one printable character belonging to the
- * "white list" (9 {TAB}, 10 {LF}, 13 {CR}, 32..255).
- * - BINARY otherwise.
- * - The following partially-portable control characters form a
- * "gray list" that is ignored in this detection algorithm:
- * (7 {BEL}, 8 {BS}, 11 {VT}, 12 {FF}, 26 {SUB}, 27 {ESC}).
- * IN assertion: the fields Freq of dyn_ltree are set.
- */
-local int detect_data_type(s)
- deflate_state *s;
-{
- /* black_mask is the bit mask of black-listed bytes
- * set bits 0..6, 14..25, and 28..31
- * 0xf3ffc07f = binary 11110011111111111100000001111111
- */
- unsigned long black_mask = 0xf3ffc07fUL;
- int n;
-
- /* Check for non-textual ("black-listed") bytes. */
- for (n = 0; n <= 31; n++, black_mask >>= 1)
- if ((black_mask & 1) && (s->dyn_ltree[n].Freq != 0))
- return Z_BINARY;
-
- /* Check for textual ("white-listed") bytes. */
- if (s->dyn_ltree[9].Freq != 0 || s->dyn_ltree[10].Freq != 0
- || s->dyn_ltree[13].Freq != 0)
- return Z_TEXT;
- for (n = 32; n < LITERALS; n++)
- if (s->dyn_ltree[n].Freq != 0)
- return Z_TEXT;
-
- /* There are no "black-listed" or "white-listed" bytes:
- * this stream either is empty or has tolerated ("gray-listed") bytes only.
- */
- return Z_BINARY;
-}
-
-/* ===========================================================================
- * Reverse the first len bits of a code, using straightforward code (a faster
- * method would use a table)
- * IN assertion: 1 <= len <= 15
- */
-local unsigned bi_reverse(code, len)
- unsigned code; /* the value to invert */
- int len; /* its bit length */
-{
- register unsigned res = 0;
- do {
- res |= code & 1;
- code >>= 1, res <<= 1;
- } while (--len > 0);
- return res >> 1;
-}
-
-/* ===========================================================================
- * Flush the bit buffer, keeping at most 7 bits in it.
- */
-local void bi_flush(s)
- deflate_state *s;
-{
- if (s->bi_valid == 16) {
- put_short(s, s->bi_buf);
- s->bi_buf = 0;
- s->bi_valid = 0;
- } else if (s->bi_valid >= 8) {
- put_byte(s, (Byte)s->bi_buf);
- s->bi_buf >>= 8;
- s->bi_valid -= 8;
- }
-}
-
-/* ===========================================================================
- * Flush the bit buffer and align the output on a byte boundary
- */
-local void bi_windup(s)
- deflate_state *s;
-{
- if (s->bi_valid > 8) {
- put_short(s, s->bi_buf);
- } else if (s->bi_valid > 0) {
- put_byte(s, (Byte)s->bi_buf);
- }
- s->bi_buf = 0;
- s->bi_valid = 0;
-#ifdef ZLIB_DEBUG
- s->bits_sent = (s->bits_sent+7) & ~7;
-#endif
-}
diff --git a/lib/sqfs/comp/zlib/trees.h b/lib/sqfs/comp/zlib/trees.h
deleted file mode 100644
index d35639d..0000000
--- a/lib/sqfs/comp/zlib/trees.h
+++ /dev/null
@@ -1,128 +0,0 @@
-/* header created automatically with -DGEN_TREES_H */
-
-local const ct_data static_ltree[L_CODES+2] = {
-{{ 12},{ 8}}, {{140},{ 8}}, {{ 76},{ 8}}, {{204},{ 8}}, {{ 44},{ 8}},
-{{172},{ 8}}, {{108},{ 8}}, {{236},{ 8}}, {{ 28},{ 8}}, {{156},{ 8}},
-{{ 92},{ 8}}, {{220},{ 8}}, {{ 60},{ 8}}, {{188},{ 8}}, {{124},{ 8}},
-{{252},{ 8}}, {{ 2},{ 8}}, {{130},{ 8}}, {{ 66},{ 8}}, {{194},{ 8}},
-{{ 34},{ 8}}, {{162},{ 8}}, {{ 98},{ 8}}, {{226},{ 8}}, {{ 18},{ 8}},
-{{146},{ 8}}, {{ 82},{ 8}}, {{210},{ 8}}, {{ 50},{ 8}}, {{178},{ 8}},
-{{114},{ 8}}, {{242},{ 8}}, {{ 10},{ 8}}, {{138},{ 8}}, {{ 74},{ 8}},
-{{202},{ 8}}, {{ 42},{ 8}}, {{170},{ 8}}, {{106},{ 8}}, {{234},{ 8}},
-{{ 26},{ 8}}, {{154},{ 8}}, {{ 90},{ 8}}, {{218},{ 8}}, {{ 58},{ 8}},
-{{186},{ 8}}, {{122},{ 8}}, {{250},{ 8}}, {{ 6},{ 8}}, {{134},{ 8}},
-{{ 70},{ 8}}, {{198},{ 8}}, {{ 38},{ 8}}, {{166},{ 8}}, {{102},{ 8}},
-{{230},{ 8}}, {{ 22},{ 8}}, {{150},{ 8}}, {{ 86},{ 8}}, {{214},{ 8}},
-{{ 54},{ 8}}, {{182},{ 8}}, {{118},{ 8}}, {{246},{ 8}}, {{ 14},{ 8}},
-{{142},{ 8}}, {{ 78},{ 8}}, {{206},{ 8}}, {{ 46},{ 8}}, {{174},{ 8}},
-{{110},{ 8}}, {{238},{ 8}}, {{ 30},{ 8}}, {{158},{ 8}}, {{ 94},{ 8}},
-{{222},{ 8}}, {{ 62},{ 8}}, {{190},{ 8}}, {{126},{ 8}}, {{254},{ 8}},
-{{ 1},{ 8}}, {{129},{ 8}}, {{ 65},{ 8}}, {{193},{ 8}}, {{ 33},{ 8}},
-{{161},{ 8}}, {{ 97},{ 8}}, {{225},{ 8}}, {{ 17},{ 8}}, {{145},{ 8}},
-{{ 81},{ 8}}, {{209},{ 8}}, {{ 49},{ 8}}, {{177},{ 8}}, {{113},{ 8}},
-{{241},{ 8}}, {{ 9},{ 8}}, {{137},{ 8}}, {{ 73},{ 8}}, {{201},{ 8}},
-{{ 41},{ 8}}, {{169},{ 8}}, {{105},{ 8}}, {{233},{ 8}}, {{ 25},{ 8}},
-{{153},{ 8}}, {{ 89},{ 8}}, {{217},{ 8}}, {{ 57},{ 8}}, {{185},{ 8}},
-{{121},{ 8}}, {{249},{ 8}}, {{ 5},{ 8}}, {{133},{ 8}}, {{ 69},{ 8}},
-{{197},{ 8}}, {{ 37},{ 8}}, {{165},{ 8}}, {{101},{ 8}}, {{229},{ 8}},
-{{ 21},{ 8}}, {{149},{ 8}}, {{ 85},{ 8}}, {{213},{ 8}}, {{ 53},{ 8}},
-{{181},{ 8}}, {{117},{ 8}}, {{245},{ 8}}, {{ 13},{ 8}}, {{141},{ 8}},
-{{ 77},{ 8}}, {{205},{ 8}}, {{ 45},{ 8}}, {{173},{ 8}}, {{109},{ 8}},
-{{237},{ 8}}, {{ 29},{ 8}}, {{157},{ 8}}, {{ 93},{ 8}}, {{221},{ 8}},
-{{ 61},{ 8}}, {{189},{ 8}}, {{125},{ 8}}, {{253},{ 8}}, {{ 19},{ 9}},
-{{275},{ 9}}, {{147},{ 9}}, {{403},{ 9}}, {{ 83},{ 9}}, {{339},{ 9}},
-{{211},{ 9}}, {{467},{ 9}}, {{ 51},{ 9}}, {{307},{ 9}}, {{179},{ 9}},
-{{435},{ 9}}, {{115},{ 9}}, {{371},{ 9}}, {{243},{ 9}}, {{499},{ 9}},
-{{ 11},{ 9}}, {{267},{ 9}}, {{139},{ 9}}, {{395},{ 9}}, {{ 75},{ 9}},
-{{331},{ 9}}, {{203},{ 9}}, {{459},{ 9}}, {{ 43},{ 9}}, {{299},{ 9}},
-{{171},{ 9}}, {{427},{ 9}}, {{107},{ 9}}, {{363},{ 9}}, {{235},{ 9}},
-{{491},{ 9}}, {{ 27},{ 9}}, {{283},{ 9}}, {{155},{ 9}}, {{411},{ 9}},
-{{ 91},{ 9}}, {{347},{ 9}}, {{219},{ 9}}, {{475},{ 9}}, {{ 59},{ 9}},
-{{315},{ 9}}, {{187},{ 9}}, {{443},{ 9}}, {{123},{ 9}}, {{379},{ 9}},
-{{251},{ 9}}, {{507},{ 9}}, {{ 7},{ 9}}, {{263},{ 9}}, {{135},{ 9}},
-{{391},{ 9}}, {{ 71},{ 9}}, {{327},{ 9}}, {{199},{ 9}}, {{455},{ 9}},
-{{ 39},{ 9}}, {{295},{ 9}}, {{167},{ 9}}, {{423},{ 9}}, {{103},{ 9}},
-{{359},{ 9}}, {{231},{ 9}}, {{487},{ 9}}, {{ 23},{ 9}}, {{279},{ 9}},
-{{151},{ 9}}, {{407},{ 9}}, {{ 87},{ 9}}, {{343},{ 9}}, {{215},{ 9}},
-{{471},{ 9}}, {{ 55},{ 9}}, {{311},{ 9}}, {{183},{ 9}}, {{439},{ 9}},
-{{119},{ 9}}, {{375},{ 9}}, {{247},{ 9}}, {{503},{ 9}}, {{ 15},{ 9}},
-{{271},{ 9}}, {{143},{ 9}}, {{399},{ 9}}, {{ 79},{ 9}}, {{335},{ 9}},
-{{207},{ 9}}, {{463},{ 9}}, {{ 47},{ 9}}, {{303},{ 9}}, {{175},{ 9}},
-{{431},{ 9}}, {{111},{ 9}}, {{367},{ 9}}, {{239},{ 9}}, {{495},{ 9}},
-{{ 31},{ 9}}, {{287},{ 9}}, {{159},{ 9}}, {{415},{ 9}}, {{ 95},{ 9}},
-{{351},{ 9}}, {{223},{ 9}}, {{479},{ 9}}, {{ 63},{ 9}}, {{319},{ 9}},
-{{191},{ 9}}, {{447},{ 9}}, {{127},{ 9}}, {{383},{ 9}}, {{255},{ 9}},
-{{511},{ 9}}, {{ 0},{ 7}}, {{ 64},{ 7}}, {{ 32},{ 7}}, {{ 96},{ 7}},
-{{ 16},{ 7}}, {{ 80},{ 7}}, {{ 48},{ 7}}, {{112},{ 7}}, {{ 8},{ 7}},
-{{ 72},{ 7}}, {{ 40},{ 7}}, {{104},{ 7}}, {{ 24},{ 7}}, {{ 88},{ 7}},
-{{ 56},{ 7}}, {{120},{ 7}}, {{ 4},{ 7}}, {{ 68},{ 7}}, {{ 36},{ 7}},
-{{100},{ 7}}, {{ 20},{ 7}}, {{ 84},{ 7}}, {{ 52},{ 7}}, {{116},{ 7}},
-{{ 3},{ 8}}, {{131},{ 8}}, {{ 67},{ 8}}, {{195},{ 8}}, {{ 35},{ 8}},
-{{163},{ 8}}, {{ 99},{ 8}}, {{227},{ 8}}
-};
-
-local const ct_data static_dtree[D_CODES] = {
-{{ 0},{ 5}}, {{16},{ 5}}, {{ 8},{ 5}}, {{24},{ 5}}, {{ 4},{ 5}},
-{{20},{ 5}}, {{12},{ 5}}, {{28},{ 5}}, {{ 2},{ 5}}, {{18},{ 5}},
-{{10},{ 5}}, {{26},{ 5}}, {{ 6},{ 5}}, {{22},{ 5}}, {{14},{ 5}},
-{{30},{ 5}}, {{ 1},{ 5}}, {{17},{ 5}}, {{ 9},{ 5}}, {{25},{ 5}},
-{{ 5},{ 5}}, {{21},{ 5}}, {{13},{ 5}}, {{29},{ 5}}, {{ 3},{ 5}},
-{{19},{ 5}}, {{11},{ 5}}, {{27},{ 5}}, {{ 7},{ 5}}, {{23},{ 5}}
-};
-
-const uch ZLIB_INTERNAL _dist_code[DIST_CODE_LEN] = {
- 0, 1, 2, 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8,
- 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10,
-10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
-11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
-12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13,
-13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
-13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
-14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
-14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
-14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15,
-15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
-15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
-15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 0, 0, 16, 17,
-18, 18, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 22,
-23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
-24, 24, 24, 24, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
-26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26,
-26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27,
-27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
-27, 27, 27, 27, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
-28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
-28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
-28, 28, 28, 28, 28, 28, 28, 28, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
-29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
-29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
-29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29
-};
-
-const uch ZLIB_INTERNAL _length_code[MAX_MATCH-MIN_MATCH+1]= {
- 0, 1, 2, 3, 4, 5, 6, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 12, 12,
-13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16,
-17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19,
-19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
-21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22,
-22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 23, 23,
-23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
-24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
-25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
-25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 26, 26, 26, 26, 26, 26, 26, 26,
-26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26,
-26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
-27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 28
-};
-
-local const int base_length[LENGTH_CODES] = {
-0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 20, 24, 28, 32, 40, 48, 56,
-64, 80, 96, 112, 128, 160, 192, 224, 0
-};
-
-local const int base_dist[D_CODES] = {
- 0, 1, 2, 3, 4, 6, 8, 12, 16, 24,
- 32, 48, 64, 96, 128, 192, 256, 384, 512, 768,
- 1024, 1536, 2048, 3072, 4096, 6144, 8192, 12288, 16384, 24576
-};
-
diff --git a/lib/sqfs/comp/zlib/zconf.h b/lib/sqfs/comp/zlib/zconf.h
deleted file mode 100644
index 427add2..0000000
--- a/lib/sqfs/comp/zlib/zconf.h
+++ /dev/null
@@ -1,471 +0,0 @@
-/* zconf.h -- configuration of the zlib compression library
- * Copyright (C) 1995-2016 Jean-loup Gailly, Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* @(#) $Id$ */
-
-#ifndef ZCONF_H
-#define ZCONF_H
-
-/*
- * If you *really* need a unique prefix for all types and library functions,
- * compile with -DZ_PREFIX. The "standard" zlib should be compiled without it.
- * Even better than compiling with -DZ_PREFIX would be to use configure to set
- * this permanently in zconf.h using "./configure --zprefix".
- */
-#ifdef Z_PREFIX /* may be set to #if 1 by ./configure */
-# define Z_PREFIX_SET
-
-/* all linked symbols and init macros */
-# define _dist_code z__dist_code
-# define _length_code z__length_code
-# define _tr_align z__tr_align
-# define _tr_flush_bits z__tr_flush_bits
-# define _tr_flush_block z__tr_flush_block
-# define _tr_init z__tr_init
-# define _tr_stored_block z__tr_stored_block
-# define _tr_tally z__tr_tally
-# define adler32 z_adler32
-# define adler32_combine z_adler32_combine
-# define adler32_combine64 z_adler32_combine64
-# define adler32_z z_adler32_z
-# ifndef Z_SOLO
-# define compress z_compress
-# define compress2 z_compress2
-# define compressBound z_compressBound
-# endif
-# define crc32 z_crc32
-# define crc32_combine z_crc32_combine
-# define crc32_combine64 z_crc32_combine64
-# define crc32_z z_crc32_z
-# define deflate z_deflate
-# define deflateBound z_deflateBound
-# define deflateCopy z_deflateCopy
-# define deflateEnd z_deflateEnd
-# define deflateGetDictionary z_deflateGetDictionary
-# define deflateInit z_deflateInit
-# define deflateInit2 z_deflateInit2
-# define deflateInit2_ z_deflateInit2_
-# define deflateInit_ z_deflateInit_
-# define deflateParams z_deflateParams
-# define deflatePending z_deflatePending
-# define deflatePrime z_deflatePrime
-# define deflateReset z_deflateReset
-# define deflateResetKeep z_deflateResetKeep
-# define deflateSetDictionary z_deflateSetDictionary
-# define deflateSetHeader z_deflateSetHeader
-# define deflateTune z_deflateTune
-# define deflate_copyright z_deflate_copyright
-# define get_crc_table z_get_crc_table
-# ifndef Z_SOLO
-# define gz_error z_gz_error
-# define gz_intmax z_gz_intmax
-# define gz_strwinerror z_gz_strwinerror
-# define gzbuffer z_gzbuffer
-# define gzclearerr z_gzclearerr
-# define gzclose z_gzclose
-# define gzclose_r z_gzclose_r
-# define gzclose_w z_gzclose_w
-# define gzdirect z_gzdirect
-# define gzdopen z_gzdopen
-# define gzeof z_gzeof
-# define gzerror z_gzerror
-# define gzflush z_gzflush
-# define gzfread z_gzfread
-# define gzfwrite z_gzfwrite
-# define gzgetc z_gzgetc
-# define gzgetc_ z_gzgetc_
-# define gzgets z_gzgets
-# define gzoffset z_gzoffset
-# define gzoffset64 z_gzoffset64
-# define gzopen z_gzopen
-# define gzopen64 z_gzopen64
-# ifdef _WIN32
-# define gzopen_w z_gzopen_w
-# endif
-# define gzprintf z_gzprintf
-# define gzputc z_gzputc
-# define gzputs z_gzputs
-# define gzread z_gzread
-# define gzrewind z_gzrewind
-# define gzseek z_gzseek
-# define gzseek64 z_gzseek64
-# define gzsetparams z_gzsetparams
-# define gztell z_gztell
-# define gztell64 z_gztell64
-# define gzungetc z_gzungetc
-# define gzvprintf z_gzvprintf
-# define gzwrite z_gzwrite
-# endif
-# define inflate z_inflate
-# define inflateBack z_inflateBack
-# define inflateBackEnd z_inflateBackEnd
-# define inflateBackInit z_inflateBackInit
-# define inflateBackInit_ z_inflateBackInit_
-# define inflateCodesUsed z_inflateCodesUsed
-# define inflateCopy z_inflateCopy
-# define inflateEnd z_inflateEnd
-# define inflateGetDictionary z_inflateGetDictionary
-# define inflateGetHeader z_inflateGetHeader
-# define inflateInit z_inflateInit
-# define inflateInit2 z_inflateInit2
-# define inflateInit2_ z_inflateInit2_
-# define inflateInit_ z_inflateInit_
-# define inflateMark z_inflateMark
-# define inflatePrime z_inflatePrime
-# define inflateReset z_inflateReset
-# define inflateReset2 z_inflateReset2
-# define inflateResetKeep z_inflateResetKeep
-# define inflateSetDictionary z_inflateSetDictionary
-# define inflateSync z_inflateSync
-# define inflateSyncPoint z_inflateSyncPoint
-# define inflateUndermine z_inflateUndermine
-# define inflateValidate z_inflateValidate
-# define inflate_copyright z_inflate_copyright
-# define inflate_fast z_inflate_fast
-# define inflate_table z_inflate_table
-# ifndef Z_SOLO
-# define uncompress z_uncompress
-# define uncompress2 z_uncompress2
-# endif
-# define zError z_zError
-# ifndef Z_SOLO
-# define zcalloc z_zcalloc
-# define zcfree z_zcfree
-# endif
-# define zlibCompileFlags z_zlibCompileFlags
-# define zlibVersion z_zlibVersion
-
-/* all zlib typedefs in zlib.h and zconf.h */
-# define Byte z_Byte
-# define Bytef z_Bytef
-# define alloc_func z_alloc_func
-# define charf z_charf
-# define free_func z_free_func
-# ifndef Z_SOLO
-# define gzFile z_gzFile
-# endif
-# define gz_header z_gz_header
-# define gz_headerp z_gz_headerp
-# define in_func z_in_func
-# define intf z_intf
-# define out_func z_out_func
-# define uInt z_uInt
-# define uIntf z_uIntf
-# define uLong z_uLong
-# define uLongf z_uLongf
-# define voidp z_voidp
-# define voidpc z_voidpc
-# define voidpf z_voidpf
-
-/* all zlib structs in zlib.h and zconf.h */
-# define gz_header_s z_gz_header_s
-# define internal_state z_internal_state
-
-#endif
-
-#if defined(__MSDOS__) && !defined(MSDOS)
-# define MSDOS
-#endif
-#if (defined(OS_2) || defined(__OS2__)) && !defined(OS2)
-# define OS2
-#endif
-#if defined(_WINDOWS) && !defined(WINDOWS)
-# define WINDOWS
-#endif
-#if defined(_WIN32) || defined(_WIN32_WCE) || defined(__WIN32__)
-# ifndef WIN32
-# define WIN32
-# endif
-#endif
-#if (defined(MSDOS) || defined(OS2) || defined(WINDOWS)) && !defined(WIN32)
-# if !defined(__GNUC__) && !defined(__FLAT__) && !defined(__386__)
-# ifndef SYS16BIT
-# define SYS16BIT
-# endif
-# endif
-#endif
-
-/*
- * Compile with -DMAXSEG_64K if the alloc function cannot allocate more
- * than 64k bytes at a time (needed on systems with 16-bit int).
- */
-#ifdef SYS16BIT
-# define MAXSEG_64K
-#endif
-#ifdef MSDOS
-# define UNALIGNED_OK
-#endif
-
-#ifdef __STDC_VERSION__
-# ifndef STDC
-# define STDC
-# endif
-# if __STDC_VERSION__ >= 199901L
-# ifndef STDC99
-# define STDC99
-# endif
-# endif
-#endif
-#if !defined(STDC) && (defined(__STDC__) || defined(__cplusplus))
-# define STDC
-#endif
-#if !defined(STDC) && (defined(__GNUC__) || defined(__BORLANDC__))
-# define STDC
-#endif
-#if !defined(STDC) && (defined(MSDOS) || defined(WINDOWS) || defined(WIN32))
-# define STDC
-#endif
-#if !defined(STDC) && (defined(OS2) || defined(__HOS_AIX__))
-# define STDC
-#endif
-
-#if defined(__OS400__) && !defined(STDC) /* iSeries (formerly AS/400). */
-# define STDC
-#endif
-
-#ifndef STDC
-# ifndef const /* cannot use !defined(STDC) && !defined(const) on Mac */
-# define const /* note: need a more gentle solution here */
-# endif
-#endif
-
-#if defined(ZLIB_CONST) && !defined(z_const)
-# define z_const const
-#else
-# define z_const
-#endif
-
-#ifdef Z_SOLO
- typedef unsigned long z_size_t;
-#else
-# define z_longlong long long
-# if defined(NO_SIZE_T)
- typedef unsigned NO_SIZE_T z_size_t;
-# elif defined(STDC)
-# include <stddef.h>
- typedef size_t z_size_t;
-# else
- typedef unsigned long z_size_t;
-# endif
-# undef z_longlong
-#endif
-
-/* Maximum value for memLevel in deflateInit2 */
-#ifndef MAX_MEM_LEVEL
-# ifdef MAXSEG_64K
-# define MAX_MEM_LEVEL 8
-# else
-# define MAX_MEM_LEVEL 9
-# endif
-#endif
-
-/* Maximum value for windowBits in deflateInit2 and inflateInit2.
- * WARNING: reducing MAX_WBITS makes minigzip unable to extract .gz files
- * created by gzip. (Files created by minigzip can still be extracted by
- * gzip.)
- */
-#ifndef MAX_WBITS
-# define MAX_WBITS 15 /* 32K LZ77 window */
-#endif
-
-/* The memory requirements for deflate are (in bytes):
- (1 << (windowBits+2)) + (1 << (memLevel+9))
- that is: 128K for windowBits=15 + 128K for memLevel = 8 (default values)
- plus a few kilobytes for small objects. For example, if you want to reduce
- the default memory requirements from 256K to 128K, compile with
- make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
- Of course this will generally degrade compression (there's no free lunch).
-
- The memory requirements for inflate are (in bytes) 1 << windowBits
- that is, 32K for windowBits=15 (default value) plus about 7 kilobytes
- for small objects.
-*/
-
- /* Type declarations */
-
-#ifndef OF /* function prototypes */
-# ifdef STDC
-# define OF(args) args
-# else
-# define OF(args) ()
-# endif
-#endif
-
-#ifndef Z_ARG /* function prototypes for stdarg */
-# if defined(STDC) || defined(Z_HAVE_STDARG_H)
-# define Z_ARG(args) args
-# else
-# define Z_ARG(args) ()
-# endif
-#endif
-
-/*
- XXX: Not original zlib source code. The definitions of ZEXTERN, ZEXPORT
- and ZEXPORTVA were removed and replaced with the following below by
- David Oberhollenzer for use in in libsquashfs.
- */
-
-#ifndef ZEXTERN
-# if (defined(__GNUC__) || defined(__clang__)) && !defined(_WIN32)
-# define ZEXTERN __attribute__ ((visibility ("hidden")))
-# else
-# define ZEXTERN
-# endif
-#endif
-#ifndef ZEXPORT
-# define ZEXPORT
-#endif
-#ifndef ZEXPORTVA
-# define ZEXPORTVA
-#endif
-#ifndef FAR
-# define FAR
-#endif
-
-#if !defined(__MACTYPES__)
-typedef unsigned char Byte; /* 8 bits */
-#endif
-typedef unsigned int uInt; /* 16 bits or more */
-typedef unsigned long uLong; /* 32 bits or more */
-
-#ifdef SMALL_MEDIUM
- /* Borland C/C++ and some old MSC versions ignore FAR inside typedef */
-# define Bytef Byte FAR
-#else
- typedef Byte FAR Bytef;
-#endif
-typedef char FAR charf;
-typedef int FAR intf;
-typedef uInt FAR uIntf;
-typedef uLong FAR uLongf;
-
-#ifdef STDC
- typedef void const *voidpc;
- typedef void FAR *voidpf;
- typedef void *voidp;
-#else
- typedef Byte const *voidpc;
- typedef Byte FAR *voidpf;
- typedef Byte *voidp;
-#endif
-
-#if !defined(Z_U4) && !defined(Z_SOLO) && defined(STDC)
-# include <limits.h>
-# if (UINT_MAX == 0xffffffffUL)
-# define Z_U4 unsigned
-# elif (ULONG_MAX == 0xffffffffUL)
-# define Z_U4 unsigned long
-# elif (USHRT_MAX == 0xffffffffUL)
-# define Z_U4 unsigned short
-# endif
-#endif
-
-#ifdef Z_U4
- typedef Z_U4 z_crc_t;
-#else
- typedef unsigned long z_crc_t;
-#endif
-
-#ifdef HAVE_UNISTD_H /* may be set to #if 1 by ./configure */
-# define Z_HAVE_UNISTD_H
-#endif
-
-#ifdef HAVE_STDARG_H /* may be set to #if 1 by ./configure */
-# define Z_HAVE_STDARG_H
-#endif
-
-#ifdef STDC
-# ifndef Z_SOLO
-# include <sys/types.h> /* for off_t */
-# endif
-#endif
-
-#if defined(STDC) || defined(Z_HAVE_STDARG_H)
-# ifndef Z_SOLO
-# include <stdarg.h> /* for va_list */
-# endif
-#endif
-
-#ifdef _WIN32
-# ifndef Z_SOLO
-# include <stddef.h> /* for wchar_t */
-# endif
-#endif
-
-/* a little trick to accommodate both "#define _LARGEFILE64_SOURCE" and
- * "#define _LARGEFILE64_SOURCE 1" as requesting 64-bit operations, (even
- * though the former does not conform to the LFS document), but considering
- * both "#undef _LARGEFILE64_SOURCE" and "#define _LARGEFILE64_SOURCE 0" as
- * equivalently requesting no 64-bit operations
- */
-#if defined(_LARGEFILE64_SOURCE) && -_LARGEFILE64_SOURCE - -1 == 1
-# undef _LARGEFILE64_SOURCE
-#endif
-
-#if defined(__WATCOMC__) && !defined(Z_HAVE_UNISTD_H)
-# define Z_HAVE_UNISTD_H
-#endif
-#ifndef Z_SOLO
-# if defined(Z_HAVE_UNISTD_H) || defined(_LARGEFILE64_SOURCE)
-# include <unistd.h> /* for SEEK_*, off_t, and _LFS64_LARGEFILE */
-# ifdef VMS
-# include <unixio.h> /* for off_t */
-# endif
-# ifndef z_off_t
-# define z_off_t off_t
-# endif
-# endif
-#endif
-
-#if defined(_LFS64_LARGEFILE) && _LFS64_LARGEFILE-0
-# define Z_LFS64
-#endif
-
-#if defined(_LARGEFILE64_SOURCE) && defined(Z_LFS64)
-# define Z_LARGE64
-#endif
-
-#if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS-0 == 64 && defined(Z_LFS64)
-# define Z_WANT64
-#endif
-
-#if !defined(SEEK_SET) && !defined(Z_SOLO)
-# define SEEK_SET 0 /* Seek from beginning of file. */
-# define SEEK_CUR 1 /* Seek from current position. */
-# define SEEK_END 2 /* Set file pointer to EOF plus "offset" */
-#endif
-
-#ifndef z_off_t
-# define z_off_t long
-#endif
-
-#if !defined(_WIN32) && defined(Z_LARGE64)
-# define z_off64_t off64_t
-#else
-# if defined(_WIN32) && !defined(__GNUC__) && !defined(Z_SOLO)
-# define z_off64_t __int64
-# else
-# define z_off64_t z_off_t
-# endif
-#endif
-
-/* MVS linker does not support external names larger than 8 bytes */
-#if defined(__MVS__)
- #pragma map(deflateInit_,"DEIN")
- #pragma map(deflateInit2_,"DEIN2")
- #pragma map(deflateEnd,"DEEND")
- #pragma map(deflateBound,"DEBND")
- #pragma map(inflateInit_,"ININ")
- #pragma map(inflateInit2_,"ININ2")
- #pragma map(inflateEnd,"INEND")
- #pragma map(inflateSync,"INSY")
- #pragma map(inflateSetDictionary,"INSEDI")
- #pragma map(compressBound,"CMBND")
- #pragma map(inflate_table,"INTABL")
- #pragma map(inflate_fast,"INFA")
- #pragma map(inflate_copyright,"INCOPY")
-#endif
-
-#endif /* ZCONF_H */
diff --git a/lib/sqfs/comp/zlib/zlib.h b/lib/sqfs/comp/zlib/zlib.h
deleted file mode 100644
index f09cdaf..0000000
--- a/lib/sqfs/comp/zlib/zlib.h
+++ /dev/null
@@ -1,1912 +0,0 @@
-/* zlib.h -- interface of the 'zlib' general purpose compression library
- version 1.2.11, January 15th, 2017
-
- Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
-
- This software is provided 'as-is', without any express or implied
- warranty. In no event will the authors be held liable for any damages
- arising from the use of this software.
-
- Permission is granted to anyone to use this software for any purpose,
- including commercial applications, and to alter it and redistribute it
- freely, subject to the following restrictions:
-
- 1. The origin of this software must not be misrepresented; you must not
- claim that you wrote the original software. If you use this software
- in a product, an acknowledgment in the product documentation would be
- appreciated but is not required.
- 2. Altered source versions must be plainly marked as such, and must not be
- misrepresented as being the original software.
- 3. This notice may not be removed or altered from any source distribution.
-
- Jean-loup Gailly Mark Adler
- jloup@gzip.org madler@alumni.caltech.edu
-
-
- The data format used by the zlib library is described by RFCs (Request for
- Comments) 1950 to 1952 in the files http://tools.ietf.org/html/rfc1950
- (zlib format), rfc1951 (deflate format) and rfc1952 (gzip format).
-*/
-
-#ifndef ZLIB_H
-#define ZLIB_H
-
-#include "zconf.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#define ZLIB_VERSION "1.2.11"
-#define ZLIB_VERNUM 0x12b0
-#define ZLIB_VER_MAJOR 1
-#define ZLIB_VER_MINOR 2
-#define ZLIB_VER_REVISION 11
-#define ZLIB_VER_SUBREVISION 0
-
-/*
- The 'zlib' compression library provides in-memory compression and
- decompression functions, including integrity checks of the uncompressed data.
- This version of the library supports only one compression method (deflation)
- but other algorithms will be added later and will have the same stream
- interface.
-
- Compression can be done in a single step if the buffers are large enough,
- or can be done by repeated calls of the compression function. In the latter
- case, the application must provide more input and/or consume the output
- (providing more output space) before each call.
-
- The compressed data format used by default by the in-memory functions is
- the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped
- around a deflate stream, which is itself documented in RFC 1951.
-
- The library also supports reading and writing files in gzip (.gz) format
- with an interface similar to that of stdio using the functions that start
- with "gz". The gzip format is different from the zlib format. gzip is a
- gzip wrapper, documented in RFC 1952, wrapped around a deflate stream.
-
- This library can optionally read and write gzip and raw deflate streams in
- memory as well.
-
- The zlib format was designed to be compact and fast for use in memory
- and on communications channels. The gzip format was designed for single-
- file compression on file systems, has a larger header than zlib to maintain
- directory information, and uses a different, slower check method than zlib.
-
- The library does not install any signal handler. The decoder checks
- the consistency of the compressed data, so the library should never crash
- even in the case of corrupted input.
-*/
-
-typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
-typedef void (*free_func) OF((voidpf opaque, voidpf address));
-
-struct internal_state;
-
-typedef struct z_stream_s {
- z_const Bytef *next_in; /* next input byte */
- uInt avail_in; /* number of bytes available at next_in */
- uLong total_in; /* total number of input bytes read so far */
-
- Bytef *next_out; /* next output byte will go here */
- uInt avail_out; /* remaining free space at next_out */
- uLong total_out; /* total number of bytes output so far */
-
- z_const char *msg; /* last error message, NULL if no error */
- struct internal_state FAR *state; /* not visible by applications */
-
- alloc_func zalloc; /* used to allocate the internal state */
- free_func zfree; /* used to free the internal state */
- voidpf opaque; /* private data object passed to zalloc and zfree */
-
- int data_type; /* best guess about the data type: binary or text
- for deflate, or the decoding state for inflate */
- uLong adler; /* Adler-32 or CRC-32 value of the uncompressed data */
- uLong reserved; /* reserved for future use */
-} z_stream;
-
-typedef z_stream FAR *z_streamp;
-
-/*
- gzip header information passed to and from zlib routines. See RFC 1952
- for more details on the meanings of these fields.
-*/
-typedef struct gz_header_s {
- int text; /* true if compressed data believed to be text */
- uLong time; /* modification time */
- int xflags; /* extra flags (not used when writing a gzip file) */
- int os; /* operating system */
- Bytef *extra; /* pointer to extra field or Z_NULL if none */
- uInt extra_len; /* extra field length (valid if extra != Z_NULL) */
- uInt extra_max; /* space at extra (only when reading header) */
- Bytef *name; /* pointer to zero-terminated file name or Z_NULL */
- uInt name_max; /* space at name (only when reading header) */
- Bytef *comment; /* pointer to zero-terminated comment or Z_NULL */
- uInt comm_max; /* space at comment (only when reading header) */
- int hcrc; /* true if there was or will be a header crc */
- int done; /* true when done reading gzip header (not used
- when writing a gzip file) */
-} gz_header;
-
-typedef gz_header FAR *gz_headerp;
-
-/*
- The application must update next_in and avail_in when avail_in has dropped
- to zero. It must update next_out and avail_out when avail_out has dropped
- to zero. The application must initialize zalloc, zfree and opaque before
- calling the init function. All other fields are set by the compression
- library and must not be updated by the application.
-
- The opaque value provided by the application will be passed as the first
- parameter for calls of zalloc and zfree. This can be useful for custom
- memory management. The compression library attaches no meaning to the
- opaque value.
-
- zalloc must return Z_NULL if there is not enough memory for the object.
- If zlib is used in a multi-threaded application, zalloc and zfree must be
- thread safe. In that case, zlib is thread-safe. When zalloc and zfree are
- Z_NULL on entry to the initialization function, they are set to internal
- routines that use the standard library functions malloc() and free().
-
- On 16-bit systems, the functions zalloc and zfree must be able to allocate
- exactly 65536 bytes, but will not be required to allocate more than this if
- the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS, pointers
- returned by zalloc for objects of exactly 65536 bytes *must* have their
- offset normalized to zero. The default allocation function provided by this
- library ensures this (see zutil.c). To reduce memory requirements and avoid
- any allocation of 64K objects, at the expense of compression ratio, compile
- the library with -DMAX_WBITS=14 (see zconf.h).
-
- The fields total_in and total_out can be used for statistics or progress
- reports. After compression, total_in holds the total size of the
- uncompressed data and may be saved for use by the decompressor (particularly
- if the decompressor wants to decompress everything in a single step).
-*/
-
- /* constants */
-
-#define Z_NO_FLUSH 0
-#define Z_PARTIAL_FLUSH 1
-#define Z_SYNC_FLUSH 2
-#define Z_FULL_FLUSH 3
-#define Z_FINISH 4
-#define Z_BLOCK 5
-#define Z_TREES 6
-/* Allowed flush values; see deflate() and inflate() below for details */
-
-#define Z_OK 0
-#define Z_STREAM_END 1
-#define Z_NEED_DICT 2
-#define Z_ERRNO (-1)
-#define Z_STREAM_ERROR (-2)
-#define Z_DATA_ERROR (-3)
-#define Z_MEM_ERROR (-4)
-#define Z_BUF_ERROR (-5)
-#define Z_VERSION_ERROR (-6)
-/* Return codes for the compression/decompression functions. Negative values
- * are errors, positive values are used for special but normal events.
- */
-
-#define Z_NO_COMPRESSION 0
-#define Z_BEST_SPEED 1
-#define Z_BEST_COMPRESSION 9
-#define Z_DEFAULT_COMPRESSION (-1)
-/* compression levels */
-
-#define Z_FILTERED 1
-#define Z_HUFFMAN_ONLY 2
-#define Z_RLE 3
-#define Z_FIXED 4
-#define Z_DEFAULT_STRATEGY 0
-/* compression strategy; see deflateInit2() below for details */
-
-#define Z_BINARY 0
-#define Z_TEXT 1
-#define Z_ASCII Z_TEXT /* for compatibility with 1.2.2 and earlier */
-#define Z_UNKNOWN 2
-/* Possible values of the data_type field for deflate() */
-
-#define Z_DEFLATED 8
-/* The deflate compression method (the only one supported in this version) */
-
-#define Z_NULL 0 /* for initializing zalloc, zfree, opaque */
-
-#define zlib_version zlibVersion()
-/* for compatibility with versions < 1.0.2 */
-
-
- /* basic functions */
-
-ZEXTERN const char * ZEXPORT zlibVersion OF((void));
-/* The application can compare zlibVersion and ZLIB_VERSION for consistency.
- If the first character differs, the library code actually used is not
- compatible with the zlib.h header file used by the application. This check
- is automatically made by deflateInit and inflateInit.
- */
-
-/*
-ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level));
-
- Initializes the internal stream state for compression. The fields
- zalloc, zfree and opaque must be initialized before by the caller. If
- zalloc and zfree are set to Z_NULL, deflateInit updates them to use default
- allocation functions.
-
- The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9:
- 1 gives best speed, 9 gives best compression, 0 gives no compression at all
- (the input data is simply copied a block at a time). Z_DEFAULT_COMPRESSION
- requests a default compromise between speed and compression (currently
- equivalent to level 6).
-
- deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough
- memory, Z_STREAM_ERROR if level is not a valid compression level, or
- Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible
- with the version assumed by the caller (ZLIB_VERSION). msg is set to null
- if there is no error message. deflateInit does not perform any compression:
- this will be done by deflate().
-*/
-
-
-ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush));
-/*
- deflate compresses as much data as possible, and stops when the input
- buffer becomes empty or the output buffer becomes full. It may introduce
- some output latency (reading input without producing any output) except when
- forced to flush.
-
- The detailed semantics are as follows. deflate performs one or both of the
- following actions:
-
- - Compress more input starting at next_in and update next_in and avail_in
- accordingly. If not all input can be processed (because there is not
- enough room in the output buffer), next_in and avail_in are updated and
- processing will resume at this point for the next call of deflate().
-
- - Generate more output starting at next_out and update next_out and avail_out
- accordingly. This action is forced if the parameter flush is non zero.
- Forcing flush frequently degrades the compression ratio, so this parameter
- should be set only when necessary. Some output may be provided even if
- flush is zero.
-
- Before the call of deflate(), the application should ensure that at least
- one of the actions is possible, by providing more input and/or consuming more
- output, and updating avail_in or avail_out accordingly; avail_out should
- never be zero before the call. The application can consume the compressed
- output when it wants, for example when the output buffer is full (avail_out
- == 0), or after each call of deflate(). If deflate returns Z_OK and with
- zero avail_out, it must be called again after making room in the output
- buffer because there might be more output pending. See deflatePending(),
- which can be used if desired to determine whether or not there is more ouput
- in that case.
-
- Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to
- decide how much data to accumulate before producing output, in order to
- maximize compression.
-
- If the parameter flush is set to Z_SYNC_FLUSH, all pending output is
- flushed to the output buffer and the output is aligned on a byte boundary, so
- that the decompressor can get all input data available so far. (In
- particular avail_in is zero after the call if enough output space has been
- provided before the call.) Flushing may degrade compression for some
- compression algorithms and so it should be used only when necessary. This
- completes the current deflate block and follows it with an empty stored block
- that is three bits plus filler bits to the next byte, followed by four bytes
- (00 00 ff ff).
-
- If flush is set to Z_PARTIAL_FLUSH, all pending output is flushed to the
- output buffer, but the output is not aligned to a byte boundary. All of the
- input data so far will be available to the decompressor, as for Z_SYNC_FLUSH.
- This completes the current deflate block and follows it with an empty fixed
- codes block that is 10 bits long. This assures that enough bytes are output
- in order for the decompressor to finish the block before the empty fixed
- codes block.
-
- If flush is set to Z_BLOCK, a deflate block is completed and emitted, as
- for Z_SYNC_FLUSH, but the output is not aligned on a byte boundary, and up to
- seven bits of the current block are held to be written as the next byte after
- the next deflate block is completed. In this case, the decompressor may not
- be provided enough bits at this point in order to complete decompression of
- the data provided so far to the compressor. It may need to wait for the next
- block to be emitted. This is for advanced applications that need to control
- the emission of deflate blocks.
-
- If flush is set to Z_FULL_FLUSH, all output is flushed as with
- Z_SYNC_FLUSH, and the compression state is reset so that decompression can
- restart from this point if previous compressed data has been damaged or if
- random access is desired. Using Z_FULL_FLUSH too often can seriously degrade
- compression.
-
- If deflate returns with avail_out == 0, this function must be called again
- with the same value of the flush parameter and more output space (updated
- avail_out), until the flush is complete (deflate returns with non-zero
- avail_out). In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that
- avail_out is greater than six to avoid repeated flush markers due to
- avail_out == 0 on return.
-
- If the parameter flush is set to Z_FINISH, pending input is processed,
- pending output is flushed and deflate returns with Z_STREAM_END if there was
- enough output space. If deflate returns with Z_OK or Z_BUF_ERROR, this
- function must be called again with Z_FINISH and more output space (updated
- avail_out) but no more input data, until it returns with Z_STREAM_END or an
- error. After deflate has returned Z_STREAM_END, the only possible operations
- on the stream are deflateReset or deflateEnd.
-
- Z_FINISH can be used in the first deflate call after deflateInit if all the
- compression is to be done in a single step. In order to complete in one
- call, avail_out must be at least the value returned by deflateBound (see
- below). Then deflate is guaranteed to return Z_STREAM_END. If not enough
- output space is provided, deflate will not return Z_STREAM_END, and it must
- be called again as described above.
-
- deflate() sets strm->adler to the Adler-32 checksum of all input read
- so far (that is, total_in bytes). If a gzip stream is being generated, then
- strm->adler will be the CRC-32 checksum of the input read so far. (See
- deflateInit2 below.)
-
- deflate() may update strm->data_type if it can make a good guess about
- the input data type (Z_BINARY or Z_TEXT). If in doubt, the data is
- considered binary. This field is only for information purposes and does not
- affect the compression algorithm in any manner.
-
- deflate() returns Z_OK if some progress has been made (more input
- processed or more output produced), Z_STREAM_END if all input has been
- consumed and all output has been produced (only when flush is set to
- Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example
- if next_in or next_out was Z_NULL or the state was inadvertently written over
- by the application), or Z_BUF_ERROR if no progress is possible (for example
- avail_in or avail_out was zero). Note that Z_BUF_ERROR is not fatal, and
- deflate() can be called again with more input and more output space to
- continue compressing.
-*/
-
-
-ZEXTERN int ZEXPORT deflateEnd OF((z_streamp strm));
-/*
- All dynamically allocated data structures for this stream are freed.
- This function discards any unprocessed input and does not flush any pending
- output.
-
- deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the
- stream state was inconsistent, Z_DATA_ERROR if the stream was freed
- prematurely (some input or output was discarded). In the error case, msg
- may be set but then points to a static string (which must not be
- deallocated).
-*/
-
-
-/*
-ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm));
-
- Initializes the internal stream state for decompression. The fields
- next_in, avail_in, zalloc, zfree and opaque must be initialized before by
- the caller. In the current version of inflate, the provided input is not
- read or consumed. The allocation of a sliding window will be deferred to
- the first call of inflate (if the decompression does not complete on the
- first call). If zalloc and zfree are set to Z_NULL, inflateInit updates
- them to use default allocation functions.
-
- inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough
- memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
- version assumed by the caller, or Z_STREAM_ERROR if the parameters are
- invalid, such as a null pointer to the structure. msg is set to null if
- there is no error message. inflateInit does not perform any decompression.
- Actual decompression will be done by inflate(). So next_in, and avail_in,
- next_out, and avail_out are unused and unchanged. The current
- implementation of inflateInit() does not process any header information --
- that is deferred until inflate() is called.
-*/
-
-
-ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush));
-/*
- inflate decompresses as much data as possible, and stops when the input
- buffer becomes empty or the output buffer becomes full. It may introduce
- some output latency (reading input without producing any output) except when
- forced to flush.
-
- The detailed semantics are as follows. inflate performs one or both of the
- following actions:
-
- - Decompress more input starting at next_in and update next_in and avail_in
- accordingly. If not all input can be processed (because there is not
- enough room in the output buffer), then next_in and avail_in are updated
- accordingly, and processing will resume at this point for the next call of
- inflate().
-
- - Generate more output starting at next_out and update next_out and avail_out
- accordingly. inflate() provides as much output as possible, until there is
- no more input data or no more space in the output buffer (see below about
- the flush parameter).
-
- Before the call of inflate(), the application should ensure that at least
- one of the actions is possible, by providing more input and/or consuming more
- output, and updating the next_* and avail_* values accordingly. If the
- caller of inflate() does not provide both available input and available
- output space, it is possible that there will be no progress made. The
- application can consume the uncompressed output when it wants, for example
- when the output buffer is full (avail_out == 0), or after each call of
- inflate(). If inflate returns Z_OK and with zero avail_out, it must be
- called again after making room in the output buffer because there might be
- more output pending.
-
- The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH, Z_FINISH,
- Z_BLOCK, or Z_TREES. Z_SYNC_FLUSH requests that inflate() flush as much
- output as possible to the output buffer. Z_BLOCK requests that inflate()
- stop if and when it gets to the next deflate block boundary. When decoding
- the zlib or gzip format, this will cause inflate() to return immediately
- after the header and before the first block. When doing a raw inflate,
- inflate() will go ahead and process the first block, and will return when it
- gets to the end of that block, or when it runs out of data.
-
- The Z_BLOCK option assists in appending to or combining deflate streams.
- To assist in this, on return inflate() always sets strm->data_type to the
- number of unused bits in the last byte taken from strm->next_in, plus 64 if
- inflate() is currently decoding the last block in the deflate stream, plus
- 128 if inflate() returned immediately after decoding an end-of-block code or
- decoding the complete header up to just before the first byte of the deflate
- stream. The end-of-block will not be indicated until all of the uncompressed
- data from that block has been written to strm->next_out. The number of
- unused bits may in general be greater than seven, except when bit 7 of
- data_type is set, in which case the number of unused bits will be less than
- eight. data_type is set as noted here every time inflate() returns for all
- flush options, and so can be used to determine the amount of currently
- consumed input in bits.
-
- The Z_TREES option behaves as Z_BLOCK does, but it also returns when the
- end of each deflate block header is reached, before any actual data in that
- block is decoded. This allows the caller to determine the length of the
- deflate block header for later use in random access within a deflate block.
- 256 is added to the value of strm->data_type when inflate() returns
- immediately after reaching the end of the deflate block header.
-
- inflate() should normally be called until it returns Z_STREAM_END or an
- error. However if all decompression is to be performed in a single step (a
- single call of inflate), the parameter flush should be set to Z_FINISH. In
- this case all pending input is processed and all pending output is flushed;
- avail_out must be large enough to hold all of the uncompressed data for the
- operation to complete. (The size of the uncompressed data may have been
- saved by the compressor for this purpose.) The use of Z_FINISH is not
- required to perform an inflation in one step. However it may be used to
- inform inflate that a faster approach can be used for the single inflate()
- call. Z_FINISH also informs inflate to not maintain a sliding window if the
- stream completes, which reduces inflate's memory footprint. If the stream
- does not complete, either because not all of the stream is provided or not
- enough output space is provided, then a sliding window will be allocated and
- inflate() can be called again to continue the operation as if Z_NO_FLUSH had
- been used.
-
- In this implementation, inflate() always flushes as much output as
- possible to the output buffer, and always uses the faster approach on the
- first call. So the effects of the flush parameter in this implementation are
- on the return value of inflate() as noted below, when inflate() returns early
- when Z_BLOCK or Z_TREES is used, and when inflate() avoids the allocation of
- memory for a sliding window when Z_FINISH is used.
-
- If a preset dictionary is needed after this call (see inflateSetDictionary
- below), inflate sets strm->adler to the Adler-32 checksum of the dictionary
- chosen by the compressor and returns Z_NEED_DICT; otherwise it sets
- strm->adler to the Adler-32 checksum of all output produced so far (that is,
- total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described
- below. At the end of the stream, inflate() checks that its computed Adler-32
- checksum is equal to that saved by the compressor and returns Z_STREAM_END
- only if the checksum is correct.
-
- inflate() can decompress and check either zlib-wrapped or gzip-wrapped
- deflate data. The header type is detected automatically, if requested when
- initializing with inflateInit2(). Any information contained in the gzip
- header is not retained unless inflateGetHeader() is used. When processing
- gzip-wrapped deflate data, strm->adler32 is set to the CRC-32 of the output
- produced so far. The CRC-32 is checked against the gzip trailer, as is the
- uncompressed length, modulo 2^32.
-
- inflate() returns Z_OK if some progress has been made (more input processed
- or more output produced), Z_STREAM_END if the end of the compressed data has
- been reached and all uncompressed output has been produced, Z_NEED_DICT if a
- preset dictionary is needed at this point, Z_DATA_ERROR if the input data was
- corrupted (input stream not conforming to the zlib format or incorrect check
- value, in which case strm->msg points to a string with a more specific
- error), Z_STREAM_ERROR if the stream structure was inconsistent (for example
- next_in or next_out was Z_NULL, or the state was inadvertently written over
- by the application), Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR
- if no progress was possible or if there was not enough room in the output
- buffer when Z_FINISH is used. Note that Z_BUF_ERROR is not fatal, and
- inflate() can be called again with more input and more output space to
- continue decompressing. If Z_DATA_ERROR is returned, the application may
- then call inflateSync() to look for a good compression block if a partial
- recovery of the data is to be attempted.
-*/
-
-
-ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm));
-/*
- All dynamically allocated data structures for this stream are freed.
- This function discards any unprocessed input and does not flush any pending
- output.
-
- inflateEnd returns Z_OK if success, or Z_STREAM_ERROR if the stream state
- was inconsistent.
-*/
-
-
- /* Advanced functions */
-
-/*
- The following functions are needed only in some special applications.
-*/
-
-/*
-ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm,
- int level,
- int method,
- int windowBits,
- int memLevel,
- int strategy));
-
- This is another version of deflateInit with more compression options. The
- fields next_in, zalloc, zfree and opaque must be initialized before by the
- caller.
-
- The method parameter is the compression method. It must be Z_DEFLATED in
- this version of the library.
-
- The windowBits parameter is the base two logarithm of the window size
- (the size of the history buffer). It should be in the range 8..15 for this
- version of the library. Larger values of this parameter result in better
- compression at the expense of memory usage. The default value is 15 if
- deflateInit is used instead.
-
- For the current implementation of deflate(), a windowBits value of 8 (a
- window size of 256 bytes) is not supported. As a result, a request for 8
- will result in 9 (a 512-byte window). In that case, providing 8 to
- inflateInit2() will result in an error when the zlib header with 9 is
- checked against the initialization of inflate(). The remedy is to not use 8
- with deflateInit2() with this initialization, or at least in that case use 9
- with inflateInit2().
-
- windowBits can also be -8..-15 for raw deflate. In this case, -windowBits
- determines the window size. deflate() will then generate raw deflate data
- with no zlib header or trailer, and will not compute a check value.
-
- windowBits can also be greater than 15 for optional gzip encoding. Add
- 16 to windowBits to write a simple gzip header and trailer around the
- compressed data instead of a zlib wrapper. The gzip header will have no
- file name, no extra data, no comment, no modification time (set to zero), no
- header crc, and the operating system will be set to the appropriate value,
- if the operating system was determined at compile time. If a gzip stream is
- being written, strm->adler is a CRC-32 instead of an Adler-32.
-
- For raw deflate or gzip encoding, a request for a 256-byte window is
- rejected as invalid, since only the zlib header provides a means of
- transmitting the window size to the decompressor.
-
- The memLevel parameter specifies how much memory should be allocated
- for the internal compression state. memLevel=1 uses minimum memory but is
- slow and reduces compression ratio; memLevel=9 uses maximum memory for
- optimal speed. The default value is 8. See zconf.h for total memory usage
- as a function of windowBits and memLevel.
-
- The strategy parameter is used to tune the compression algorithm. Use the
- value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a
- filter (or predictor), Z_HUFFMAN_ONLY to force Huffman encoding only (no
- string match), or Z_RLE to limit match distances to one (run-length
- encoding). Filtered data consists mostly of small values with a somewhat
- random distribution. In this case, the compression algorithm is tuned to
- compress them better. The effect of Z_FILTERED is to force more Huffman
- coding and less string matching; it is somewhat intermediate between
- Z_DEFAULT_STRATEGY and Z_HUFFMAN_ONLY. Z_RLE is designed to be almost as
- fast as Z_HUFFMAN_ONLY, but give better compression for PNG image data. The
- strategy parameter only affects the compression ratio but not the
- correctness of the compressed output even if it is not set appropriately.
- Z_FIXED prevents the use of dynamic Huffman codes, allowing for a simpler
- decoder for special applications.
-
- deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
- memory, Z_STREAM_ERROR if any parameter is invalid (such as an invalid
- method), or Z_VERSION_ERROR if the zlib library version (zlib_version) is
- incompatible with the version assumed by the caller (ZLIB_VERSION). msg is
- set to null if there is no error message. deflateInit2 does not perform any
- compression: this will be done by deflate().
-*/
-
-ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm,
- const Bytef *dictionary,
- uInt dictLength));
-/*
- Initializes the compression dictionary from the given byte sequence
- without producing any compressed output. When using the zlib format, this
- function must be called immediately after deflateInit, deflateInit2 or
- deflateReset, and before any call of deflate. When doing raw deflate, this
- function must be called either before any call of deflate, or immediately
- after the completion of a deflate block, i.e. after all input has been
- consumed and all output has been delivered when using any of the flush
- options Z_BLOCK, Z_PARTIAL_FLUSH, Z_SYNC_FLUSH, or Z_FULL_FLUSH. The
- compressor and decompressor must use exactly the same dictionary (see
- inflateSetDictionary).
-
- The dictionary should consist of strings (byte sequences) that are likely
- to be encountered later in the data to be compressed, with the most commonly
- used strings preferably put towards the end of the dictionary. Using a
- dictionary is most useful when the data to be compressed is short and can be
- predicted with good accuracy; the data can then be compressed better than
- with the default empty dictionary.
-
- Depending on the size of the compression data structures selected by
- deflateInit or deflateInit2, a part of the dictionary may in effect be
- discarded, for example if the dictionary is larger than the window size
- provided in deflateInit or deflateInit2. Thus the strings most likely to be
- useful should be put at the end of the dictionary, not at the front. In
- addition, the current implementation of deflate will use at most the window
- size minus 262 bytes of the provided dictionary.
-
- Upon return of this function, strm->adler is set to the Adler-32 value
- of the dictionary; the decompressor may later use this value to determine
- which dictionary has been used by the compressor. (The Adler-32 value
- applies to the whole dictionary even if only a subset of the dictionary is
- actually used by the compressor.) If a raw deflate was requested, then the
- Adler-32 value is not computed and strm->adler is not set.
-
- deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a
- parameter is invalid (e.g. dictionary being Z_NULL) or the stream state is
- inconsistent (for example if deflate has already been called for this stream
- or if not at a block boundary for raw deflate). deflateSetDictionary does
- not perform any compression: this will be done by deflate().
-*/
-
-ZEXTERN int ZEXPORT deflateGetDictionary OF((z_streamp strm,
- Bytef *dictionary,
- uInt *dictLength));
-/*
- Returns the sliding dictionary being maintained by deflate. dictLength is
- set to the number of bytes in the dictionary, and that many bytes are copied
- to dictionary. dictionary must have enough space, where 32768 bytes is
- always enough. If deflateGetDictionary() is called with dictionary equal to
- Z_NULL, then only the dictionary length is returned, and nothing is copied.
- Similary, if dictLength is Z_NULL, then it is not set.
-
- deflateGetDictionary() may return a length less than the window size, even
- when more than the window size in input has been provided. It may return up
- to 258 bytes less in that case, due to how zlib's implementation of deflate
- manages the sliding window and lookahead for matches, where matches can be
- up to 258 bytes long. If the application needs the last window-size bytes of
- input, then that would need to be saved by the application outside of zlib.
-
- deflateGetDictionary returns Z_OK on success, or Z_STREAM_ERROR if the
- stream state is inconsistent.
-*/
-
-ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest,
- z_streamp source));
-/*
- Sets the destination stream as a complete copy of the source stream.
-
- This function can be useful when several compression strategies will be
- tried, for example when there are several ways of pre-processing the input
- data with a filter. The streams that will be discarded should then be freed
- by calling deflateEnd. Note that deflateCopy duplicates the internal
- compression state which can be quite large, so this strategy is slow and can
- consume lots of memory.
-
- deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
- enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
- (such as zalloc being Z_NULL). msg is left unchanged in both source and
- destination.
-*/
-
-ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm));
-/*
- This function is equivalent to deflateEnd followed by deflateInit, but
- does not free and reallocate the internal compression state. The stream
- will leave the compression level and any other attributes that may have been
- set unchanged.
-
- deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
- stream state was inconsistent (such as zalloc or state being Z_NULL).
-*/
-
-ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm,
- int level,
- int strategy));
-/*
- Dynamically update the compression level and compression strategy. The
- interpretation of level and strategy is as in deflateInit2(). This can be
- used to switch between compression and straight copy of the input data, or
- to switch to a different kind of input data requiring a different strategy.
- If the compression approach (which is a function of the level) or the
- strategy is changed, and if any input has been consumed in a previous
- deflate() call, then the input available so far is compressed with the old
- level and strategy using deflate(strm, Z_BLOCK). There are three approaches
- for the compression levels 0, 1..3, and 4..9 respectively. The new level
- and strategy will take effect at the next call of deflate().
-
- If a deflate(strm, Z_BLOCK) is performed by deflateParams(), and it does
- not have enough output space to complete, then the parameter change will not
- take effect. In this case, deflateParams() can be called again with the
- same parameters and more output space to try again.
-
- In order to assure a change in the parameters on the first try, the
- deflate stream should be flushed using deflate() with Z_BLOCK or other flush
- request until strm.avail_out is not zero, before calling deflateParams().
- Then no more input data should be provided before the deflateParams() call.
- If this is done, the old level and strategy will be applied to the data
- compressed before deflateParams(), and the new level and strategy will be
- applied to the the data compressed after deflateParams().
-
- deflateParams returns Z_OK on success, Z_STREAM_ERROR if the source stream
- state was inconsistent or if a parameter was invalid, or Z_BUF_ERROR if
- there was not enough output space to complete the compression of the
- available input data before a change in the strategy or approach. Note that
- in the case of a Z_BUF_ERROR, the parameters are not changed. A return
- value of Z_BUF_ERROR is not fatal, in which case deflateParams() can be
- retried with more output space.
-*/
-
-ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm,
- int good_length,
- int max_lazy,
- int nice_length,
- int max_chain));
-/*
- Fine tune deflate's internal compression parameters. This should only be
- used by someone who understands the algorithm used by zlib's deflate for
- searching for the best matching string, and even then only by the most
- fanatic optimizer trying to squeeze out the last compressed bit for their
- specific input data. Read the deflate.c source code for the meaning of the
- max_lazy, good_length, nice_length, and max_chain parameters.
-
- deflateTune() can be called after deflateInit() or deflateInit2(), and
- returns Z_OK on success, or Z_STREAM_ERROR for an invalid deflate stream.
- */
-
-ZEXTERN uLong ZEXPORT deflateBound OF((z_streamp strm,
- uLong sourceLen));
-/*
- deflateBound() returns an upper bound on the compressed size after
- deflation of sourceLen bytes. It must be called after deflateInit() or
- deflateInit2(), and after deflateSetHeader(), if used. This would be used
- to allocate an output buffer for deflation in a single pass, and so would be
- called before deflate(). If that first deflate() call is provided the
- sourceLen input bytes, an output buffer allocated to the size returned by
- deflateBound(), and the flush value Z_FINISH, then deflate() is guaranteed
- to return Z_STREAM_END. Note that it is possible for the compressed size to
- be larger than the value returned by deflateBound() if flush options other
- than Z_FINISH or Z_NO_FLUSH are used.
-*/
-
-ZEXTERN int ZEXPORT deflatePending OF((z_streamp strm,
- unsigned *pending,
- int *bits));
-/*
- deflatePending() returns the number of bytes and bits of output that have
- been generated, but not yet provided in the available output. The bytes not
- provided would be due to the available output space having being consumed.
- The number of bits of output not provided are between 0 and 7, where they
- await more bits to join them in order to fill out a full byte. If pending
- or bits are Z_NULL, then those values are not set.
-
- deflatePending returns Z_OK if success, or Z_STREAM_ERROR if the source
- stream state was inconsistent.
- */
-
-ZEXTERN int ZEXPORT deflatePrime OF((z_streamp strm,
- int bits,
- int value));
-/*
- deflatePrime() inserts bits in the deflate output stream. The intent
- is that this function is used to start off the deflate output with the bits
- leftover from a previous deflate stream when appending to it. As such, this
- function can only be used for raw deflate, and must be used before the first
- deflate() call after a deflateInit2() or deflateReset(). bits must be less
- than or equal to 16, and that many of the least significant bits of value
- will be inserted in the output.
-
- deflatePrime returns Z_OK if success, Z_BUF_ERROR if there was not enough
- room in the internal buffer to insert the bits, or Z_STREAM_ERROR if the
- source stream state was inconsistent.
-*/
-
-ZEXTERN int ZEXPORT deflateSetHeader OF((z_streamp strm,
- gz_headerp head));
-/*
- deflateSetHeader() provides gzip header information for when a gzip
- stream is requested by deflateInit2(). deflateSetHeader() may be called
- after deflateInit2() or deflateReset() and before the first call of
- deflate(). The text, time, os, extra field, name, and comment information
- in the provided gz_header structure are written to the gzip header (xflag is
- ignored -- the extra flags are set according to the compression level). The
- caller must assure that, if not Z_NULL, name and comment are terminated with
- a zero byte, and that if extra is not Z_NULL, that extra_len bytes are
- available there. If hcrc is true, a gzip header crc is included. Note that
- the current versions of the command-line version of gzip (up through version
- 1.3.x) do not support header crc's, and will report that it is a "multi-part
- gzip file" and give up.
-
- If deflateSetHeader is not used, the default gzip header has text false,
- the time set to zero, and os set to 255, with no extra, name, or comment
- fields. The gzip header is returned to the default state by deflateReset().
-
- deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
- stream state was inconsistent.
-*/
-
-/*
-ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm,
- int windowBits));
-
- This is another version of inflateInit with an extra parameter. The
- fields next_in, avail_in, zalloc, zfree and opaque must be initialized
- before by the caller.
-
- The windowBits parameter is the base two logarithm of the maximum window
- size (the size of the history buffer). It should be in the range 8..15 for
- this version of the library. The default value is 15 if inflateInit is used
- instead. windowBits must be greater than or equal to the windowBits value
- provided to deflateInit2() while compressing, or it must be equal to 15 if
- deflateInit2() was not used. If a compressed stream with a larger window
- size is given as input, inflate() will return with the error code
- Z_DATA_ERROR instead of trying to allocate a larger window.
-
- windowBits can also be zero to request that inflate use the window size in
- the zlib header of the compressed stream.
-
- windowBits can also be -8..-15 for raw inflate. In this case, -windowBits
- determines the window size. inflate() will then process raw deflate data,
- not looking for a zlib or gzip header, not generating a check value, and not
- looking for any check values for comparison at the end of the stream. This
- is for use with other formats that use the deflate compressed data format
- such as zip. Those formats provide their own check values. If a custom
- format is developed using the raw deflate format for compressed data, it is
- recommended that a check value such as an Adler-32 or a CRC-32 be applied to
- the uncompressed data as is done in the zlib, gzip, and zip formats. For
- most applications, the zlib format should be used as is. Note that comments
- above on the use in deflateInit2() applies to the magnitude of windowBits.
-
- windowBits can also be greater than 15 for optional gzip decoding. Add
- 32 to windowBits to enable zlib and gzip decoding with automatic header
- detection, or add 16 to decode only the gzip format (the zlib format will
- return a Z_DATA_ERROR). If a gzip stream is being decoded, strm->adler is a
- CRC-32 instead of an Adler-32. Unlike the gunzip utility and gzread() (see
- below), inflate() will not automatically decode concatenated gzip streams.
- inflate() will return Z_STREAM_END at the end of the gzip stream. The state
- would need to be reset to continue decoding a subsequent gzip stream.
-
- inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
- memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
- version assumed by the caller, or Z_STREAM_ERROR if the parameters are
- invalid, such as a null pointer to the structure. msg is set to null if
- there is no error message. inflateInit2 does not perform any decompression
- apart from possibly reading the zlib header if present: actual decompression
- will be done by inflate(). (So next_in and avail_in may be modified, but
- next_out and avail_out are unused and unchanged.) The current implementation
- of inflateInit2() does not process any header information -- that is
- deferred until inflate() is called.
-*/
-
-ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm,
- const Bytef *dictionary,
- uInt dictLength));
-/*
- Initializes the decompression dictionary from the given uncompressed byte
- sequence. This function must be called immediately after a call of inflate,
- if that call returned Z_NEED_DICT. The dictionary chosen by the compressor
- can be determined from the Adler-32 value returned by that call of inflate.
- The compressor and decompressor must use exactly the same dictionary (see
- deflateSetDictionary). For raw inflate, this function can be called at any
- time to set the dictionary. If the provided dictionary is smaller than the
- window and there is already data in the window, then the provided dictionary
- will amend what's there. The application must insure that the dictionary
- that was used for compression is provided.
-
- inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a
- parameter is invalid (e.g. dictionary being Z_NULL) or the stream state is
- inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the
- expected one (incorrect Adler-32 value). inflateSetDictionary does not
- perform any decompression: this will be done by subsequent calls of
- inflate().
-*/
-
-ZEXTERN int ZEXPORT inflateGetDictionary OF((z_streamp strm,
- Bytef *dictionary,
- uInt *dictLength));
-/*
- Returns the sliding dictionary being maintained by inflate. dictLength is
- set to the number of bytes in the dictionary, and that many bytes are copied
- to dictionary. dictionary must have enough space, where 32768 bytes is
- always enough. If inflateGetDictionary() is called with dictionary equal to
- Z_NULL, then only the dictionary length is returned, and nothing is copied.
- Similary, if dictLength is Z_NULL, then it is not set.
-
- inflateGetDictionary returns Z_OK on success, or Z_STREAM_ERROR if the
- stream state is inconsistent.
-*/
-
-ZEXTERN int ZEXPORT inflateSync OF((z_streamp strm));
-/*
- Skips invalid compressed data until a possible full flush point (see above
- for the description of deflate with Z_FULL_FLUSH) can be found, or until all
- available input is skipped. No output is provided.
-
- inflateSync searches for a 00 00 FF FF pattern in the compressed data.
- All full flush points have this pattern, but not all occurrences of this
- pattern are full flush points.
-
- inflateSync returns Z_OK if a possible full flush point has been found,
- Z_BUF_ERROR if no more input was provided, Z_DATA_ERROR if no flush point
- has been found, or Z_STREAM_ERROR if the stream structure was inconsistent.
- In the success case, the application may save the current current value of
- total_in which indicates where valid compressed data was found. In the
- error case, the application may repeatedly call inflateSync, providing more
- input each time, until success or end of the input data.
-*/
-
-ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest,
- z_streamp source));
-/*
- Sets the destination stream as a complete copy of the source stream.
-
- This function can be useful when randomly accessing a large stream. The
- first pass through the stream can periodically record the inflate state,
- allowing restarting inflate at those points when randomly accessing the
- stream.
-
- inflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
- enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
- (such as zalloc being Z_NULL). msg is left unchanged in both source and
- destination.
-*/
-
-ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm));
-/*
- This function is equivalent to inflateEnd followed by inflateInit,
- but does not free and reallocate the internal decompression state. The
- stream will keep attributes that may have been set by inflateInit2.
-
- inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
- stream state was inconsistent (such as zalloc or state being Z_NULL).
-*/
-
-ZEXTERN int ZEXPORT inflateReset2 OF((z_streamp strm,
- int windowBits));
-/*
- This function is the same as inflateReset, but it also permits changing
- the wrap and window size requests. The windowBits parameter is interpreted
- the same as it is for inflateInit2. If the window size is changed, then the
- memory allocated for the window is freed, and the window will be reallocated
- by inflate() if needed.
-
- inflateReset2 returns Z_OK if success, or Z_STREAM_ERROR if the source
- stream state was inconsistent (such as zalloc or state being Z_NULL), or if
- the windowBits parameter is invalid.
-*/
-
-ZEXTERN int ZEXPORT inflatePrime OF((z_streamp strm,
- int bits,
- int value));
-/*
- This function inserts bits in the inflate input stream. The intent is
- that this function is used to start inflating at a bit position in the
- middle of a byte. The provided bits will be used before any bytes are used
- from next_in. This function should only be used with raw inflate, and
- should be used before the first inflate() call after inflateInit2() or
- inflateReset(). bits must be less than or equal to 16, and that many of the
- least significant bits of value will be inserted in the input.
-
- If bits is negative, then the input stream bit buffer is emptied. Then
- inflatePrime() can be called again to put bits in the buffer. This is used
- to clear out bits leftover after feeding inflate a block description prior
- to feeding inflate codes.
-
- inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source
- stream state was inconsistent.
-*/
-
-ZEXTERN long ZEXPORT inflateMark OF((z_streamp strm));
-/*
- This function returns two values, one in the lower 16 bits of the return
- value, and the other in the remaining upper bits, obtained by shifting the
- return value down 16 bits. If the upper value is -1 and the lower value is
- zero, then inflate() is currently decoding information outside of a block.
- If the upper value is -1 and the lower value is non-zero, then inflate is in
- the middle of a stored block, with the lower value equaling the number of
- bytes from the input remaining to copy. If the upper value is not -1, then
- it is the number of bits back from the current bit position in the input of
- the code (literal or length/distance pair) currently being processed. In
- that case the lower value is the number of bytes already emitted for that
- code.
-
- A code is being processed if inflate is waiting for more input to complete
- decoding of the code, or if it has completed decoding but is waiting for
- more output space to write the literal or match data.
-
- inflateMark() is used to mark locations in the input data for random
- access, which may be at bit positions, and to note those cases where the
- output of a code may span boundaries of random access blocks. The current
- location in the input stream can be determined from avail_in and data_type
- as noted in the description for the Z_BLOCK flush parameter for inflate.
-
- inflateMark returns the value noted above, or -65536 if the provided
- source stream state was inconsistent.
-*/
-
-ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm,
- gz_headerp head));
-/*
- inflateGetHeader() requests that gzip header information be stored in the
- provided gz_header structure. inflateGetHeader() may be called after
- inflateInit2() or inflateReset(), and before the first call of inflate().
- As inflate() processes the gzip stream, head->done is zero until the header
- is completed, at which time head->done is set to one. If a zlib stream is
- being decoded, then head->done is set to -1 to indicate that there will be
- no gzip header information forthcoming. Note that Z_BLOCK or Z_TREES can be
- used to force inflate() to return immediately after header processing is
- complete and before any actual data is decompressed.
-
- The text, time, xflags, and os fields are filled in with the gzip header
- contents. hcrc is set to true if there is a header CRC. (The header CRC
- was valid if done is set to one.) If extra is not Z_NULL, then extra_max
- contains the maximum number of bytes to write to extra. Once done is true,
- extra_len contains the actual extra field length, and extra contains the
- extra field, or that field truncated if extra_max is less than extra_len.
- If name is not Z_NULL, then up to name_max characters are written there,
- terminated with a zero unless the length is greater than name_max. If
- comment is not Z_NULL, then up to comm_max characters are written there,
- terminated with a zero unless the length is greater than comm_max. When any
- of extra, name, or comment are not Z_NULL and the respective field is not
- present in the header, then that field is set to Z_NULL to signal its
- absence. This allows the use of deflateSetHeader() with the returned
- structure to duplicate the header. However if those fields are set to
- allocated memory, then the application will need to save those pointers
- elsewhere so that they can be eventually freed.
-
- If inflateGetHeader is not used, then the header information is simply
- discarded. The header is always checked for validity, including the header
- CRC if present. inflateReset() will reset the process to discard the header
- information. The application would need to call inflateGetHeader() again to
- retrieve the header from the next gzip stream.
-
- inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
- stream state was inconsistent.
-*/
-
-/*
-ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits,
- unsigned char FAR *window));
-
- Initialize the internal stream state for decompression using inflateBack()
- calls. The fields zalloc, zfree and opaque in strm must be initialized
- before the call. If zalloc and zfree are Z_NULL, then the default library-
- derived memory allocation routines are used. windowBits is the base two
- logarithm of the window size, in the range 8..15. window is a caller
- supplied buffer of that size. Except for special applications where it is
- assured that deflate was used with small window sizes, windowBits must be 15
- and a 32K byte window must be supplied to be able to decompress general
- deflate streams.
-
- See inflateBack() for the usage of these routines.
-
- inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of
- the parameters are invalid, Z_MEM_ERROR if the internal state could not be
- allocated, or Z_VERSION_ERROR if the version of the library does not match
- the version of the header file.
-*/
-
-typedef unsigned (*in_func) OF((void FAR *,
- z_const unsigned char FAR * FAR *));
-typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned));
-
-ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm,
- in_func in, void FAR *in_desc,
- out_func out, void FAR *out_desc));
-/*
- inflateBack() does a raw inflate with a single call using a call-back
- interface for input and output. This is potentially more efficient than
- inflate() for file i/o applications, in that it avoids copying between the
- output and the sliding window by simply making the window itself the output
- buffer. inflate() can be faster on modern CPUs when used with large
- buffers. inflateBack() trusts the application to not change the output
- buffer passed by the output function, at least until inflateBack() returns.
-
- inflateBackInit() must be called first to allocate the internal state
- and to initialize the state with the user-provided window buffer.
- inflateBack() may then be used multiple times to inflate a complete, raw
- deflate stream with each call. inflateBackEnd() is then called to free the
- allocated state.
-
- A raw deflate stream is one with no zlib or gzip header or trailer.
- This routine would normally be used in a utility that reads zip or gzip
- files and writes out uncompressed files. The utility would decode the
- header and process the trailer on its own, hence this routine expects only
- the raw deflate stream to decompress. This is different from the default
- behavior of inflate(), which expects a zlib header and trailer around the
- deflate stream.
-
- inflateBack() uses two subroutines supplied by the caller that are then
- called by inflateBack() for input and output. inflateBack() calls those
- routines until it reads a complete deflate stream and writes out all of the
- uncompressed data, or until it encounters an error. The function's
- parameters and return types are defined above in the in_func and out_func
- typedefs. inflateBack() will call in(in_desc, &buf) which should return the
- number of bytes of provided input, and a pointer to that input in buf. If
- there is no input available, in() must return zero -- buf is ignored in that
- case -- and inflateBack() will return a buffer error. inflateBack() will
- call out(out_desc, buf, len) to write the uncompressed data buf[0..len-1].
- out() should return zero on success, or non-zero on failure. If out()
- returns non-zero, inflateBack() will return with an error. Neither in() nor
- out() are permitted to change the contents of the window provided to
- inflateBackInit(), which is also the buffer that out() uses to write from.
- The length written by out() will be at most the window size. Any non-zero
- amount of input may be provided by in().
-
- For convenience, inflateBack() can be provided input on the first call by
- setting strm->next_in and strm->avail_in. If that input is exhausted, then
- in() will be called. Therefore strm->next_in must be initialized before
- calling inflateBack(). If strm->next_in is Z_NULL, then in() will be called
- immediately for input. If strm->next_in is not Z_NULL, then strm->avail_in
- must also be initialized, and then if strm->avail_in is not zero, input will
- initially be taken from strm->next_in[0 .. strm->avail_in - 1].
-
- The in_desc and out_desc parameters of inflateBack() is passed as the
- first parameter of in() and out() respectively when they are called. These
- descriptors can be optionally used to pass any information that the caller-
- supplied in() and out() functions need to do their job.
-
- On return, inflateBack() will set strm->next_in and strm->avail_in to
- pass back any unused input that was provided by the last in() call. The
- return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR
- if in() or out() returned an error, Z_DATA_ERROR if there was a format error
- in the deflate stream (in which case strm->msg is set to indicate the nature
- of the error), or Z_STREAM_ERROR if the stream was not properly initialized.
- In the case of Z_BUF_ERROR, an input or output error can be distinguished
- using strm->next_in which will be Z_NULL only if in() returned an error. If
- strm->next_in is not Z_NULL, then the Z_BUF_ERROR was due to out() returning
- non-zero. (in() will always be called before out(), so strm->next_in is
- assured to be defined if out() returns non-zero.) Note that inflateBack()
- cannot return Z_OK.
-*/
-
-ZEXTERN int ZEXPORT inflateBackEnd OF((z_streamp strm));
-/*
- All memory allocated by inflateBackInit() is freed.
-
- inflateBackEnd() returns Z_OK on success, or Z_STREAM_ERROR if the stream
- state was inconsistent.
-*/
-
-ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void));
-/* Return flags indicating compile-time options.
-
- Type sizes, two bits each, 00 = 16 bits, 01 = 32, 10 = 64, 11 = other:
- 1.0: size of uInt
- 3.2: size of uLong
- 5.4: size of voidpf (pointer)
- 7.6: size of z_off_t
-
- Compiler, assembler, and debug options:
- 8: ZLIB_DEBUG
- 9: ASMV or ASMINF -- use ASM code
- 10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention
- 11: 0 (reserved)
-
- One-time table building (smaller code, but not thread-safe if true):
- 12: BUILDFIXED -- build static block decoding tables when needed
- 13: DYNAMIC_CRC_TABLE -- build CRC calculation tables when needed
- 14,15: 0 (reserved)
-
- Library content (indicates missing functionality):
- 16: NO_GZCOMPRESS -- gz* functions cannot compress (to avoid linking
- deflate code when not needed)
- 17: NO_GZIP -- deflate can't write gzip streams, and inflate can't detect
- and decode gzip streams (to avoid linking crc code)
- 18-19: 0 (reserved)
-
- Operation variations (changes in library functionality):
- 20: PKZIP_BUG_WORKAROUND -- slightly more permissive inflate
- 21: FASTEST -- deflate algorithm with only one, lowest compression level
- 22,23: 0 (reserved)
-
- The sprintf variant used by gzprintf (zero is best):
- 24: 0 = vs*, 1 = s* -- 1 means limited to 20 arguments after the format
- 25: 0 = *nprintf, 1 = *printf -- 1 means gzprintf() not secure!
- 26: 0 = returns value, 1 = void -- 1 means inferred string length returned
-
- Remainder:
- 27-31: 0 (reserved)
- */
-
-#ifndef Z_SOLO
-
- /* utility functions */
-
-/*
- The following utility functions are implemented on top of the basic
- stream-oriented functions. To simplify the interface, some default options
- are assumed (compression level and memory usage, standard memory allocation
- functions). The source code of these utility functions can be modified if
- you need special options.
-*/
-
-ZEXTERN int ZEXPORT compress OF((Bytef *dest, uLongf *destLen,
- const Bytef *source, uLong sourceLen));
-/*
- Compresses the source buffer into the destination buffer. sourceLen is
- the byte length of the source buffer. Upon entry, destLen is the total size
- of the destination buffer, which must be at least the value returned by
- compressBound(sourceLen). Upon exit, destLen is the actual size of the
- compressed data. compress() is equivalent to compress2() with a level
- parameter of Z_DEFAULT_COMPRESSION.
-
- compress returns Z_OK if success, Z_MEM_ERROR if there was not
- enough memory, Z_BUF_ERROR if there was not enough room in the output
- buffer.
-*/
-
-ZEXTERN int ZEXPORT compress2 OF((Bytef *dest, uLongf *destLen,
- const Bytef *source, uLong sourceLen,
- int level));
-/*
- Compresses the source buffer into the destination buffer. The level
- parameter has the same meaning as in deflateInit. sourceLen is the byte
- length of the source buffer. Upon entry, destLen is the total size of the
- destination buffer, which must be at least the value returned by
- compressBound(sourceLen). Upon exit, destLen is the actual size of the
- compressed data.
-
- compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
- memory, Z_BUF_ERROR if there was not enough room in the output buffer,
- Z_STREAM_ERROR if the level parameter is invalid.
-*/
-
-ZEXTERN uLong ZEXPORT compressBound OF((uLong sourceLen));
-/*
- compressBound() returns an upper bound on the compressed size after
- compress() or compress2() on sourceLen bytes. It would be used before a
- compress() or compress2() call to allocate the destination buffer.
-*/
-
-ZEXTERN int ZEXPORT uncompress OF((Bytef *dest, uLongf *destLen,
- const Bytef *source, uLong sourceLen));
-/*
- Decompresses the source buffer into the destination buffer. sourceLen is
- the byte length of the source buffer. Upon entry, destLen is the total size
- of the destination buffer, which must be large enough to hold the entire
- uncompressed data. (The size of the uncompressed data must have been saved
- previously by the compressor and transmitted to the decompressor by some
- mechanism outside the scope of this compression library.) Upon exit, destLen
- is the actual size of the uncompressed data.
-
- uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
- enough memory, Z_BUF_ERROR if there was not enough room in the output
- buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete. In
- the case where there is not enough room, uncompress() will fill the output
- buffer with the uncompressed data up to that point.
-*/
-
-ZEXTERN int ZEXPORT uncompress2 OF((Bytef *dest, uLongf *destLen,
- const Bytef *source, uLong *sourceLen));
-/*
- Same as uncompress, except that sourceLen is a pointer, where the
- length of the source is *sourceLen. On return, *sourceLen is the number of
- source bytes consumed.
-*/
-
- /* gzip file access functions */
-
-/*
- This library supports reading and writing files in gzip (.gz) format with
- an interface similar to that of stdio, using the functions that start with
- "gz". The gzip format is different from the zlib format. gzip is a gzip
- wrapper, documented in RFC 1952, wrapped around a deflate stream.
-*/
-
-typedef struct gzFile_s *gzFile; /* semi-opaque gzip file descriptor */
-
-/*
-ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode));
-
- Opens a gzip (.gz) file for reading or writing. The mode parameter is as
- in fopen ("rb" or "wb") but can also include a compression level ("wb9") or
- a strategy: 'f' for filtered data as in "wb6f", 'h' for Huffman-only
- compression as in "wb1h", 'R' for run-length encoding as in "wb1R", or 'F'
- for fixed code compression as in "wb9F". (See the description of
- deflateInit2 for more information about the strategy parameter.) 'T' will
- request transparent writing or appending with no compression and not using
- the gzip format.
-
- "a" can be used instead of "w" to request that the gzip stream that will
- be written be appended to the file. "+" will result in an error, since
- reading and writing to the same gzip file is not supported. The addition of
- "x" when writing will create the file exclusively, which fails if the file
- already exists. On systems that support it, the addition of "e" when
- reading or writing will set the flag to close the file on an execve() call.
-
- These functions, as well as gzip, will read and decode a sequence of gzip
- streams in a file. The append function of gzopen() can be used to create
- such a file. (Also see gzflush() for another way to do this.) When
- appending, gzopen does not test whether the file begins with a gzip stream,
- nor does it look for the end of the gzip streams to begin appending. gzopen
- will simply append a gzip stream to the existing file.
-
- gzopen can be used to read a file which is not in gzip format; in this
- case gzread will directly read from the file without decompression. When
- reading, this will be detected automatically by looking for the magic two-
- byte gzip header.
-
- gzopen returns NULL if the file could not be opened, if there was
- insufficient memory to allocate the gzFile state, or if an invalid mode was
- specified (an 'r', 'w', or 'a' was not provided, or '+' was provided).
- errno can be checked to determine if the reason gzopen failed was that the
- file could not be opened.
-*/
-
-ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode));
-/*
- gzdopen associates a gzFile with the file descriptor fd. File descriptors
- are obtained from calls like open, dup, creat, pipe or fileno (if the file
- has been previously opened with fopen). The mode parameter is as in gzopen.
-
- The next call of gzclose on the returned gzFile will also close the file
- descriptor fd, just like fclose(fdopen(fd, mode)) closes the file descriptor
- fd. If you want to keep fd open, use fd = dup(fd_keep); gz = gzdopen(fd,
- mode);. The duplicated descriptor should be saved to avoid a leak, since
- gzdopen does not close fd if it fails. If you are using fileno() to get the
- file descriptor from a FILE *, then you will have to use dup() to avoid
- double-close()ing the file descriptor. Both gzclose() and fclose() will
- close the associated file descriptor, so they need to have different file
- descriptors.
-
- gzdopen returns NULL if there was insufficient memory to allocate the
- gzFile state, if an invalid mode was specified (an 'r', 'w', or 'a' was not
- provided, or '+' was provided), or if fd is -1. The file descriptor is not
- used until the next gz* read, write, seek, or close operation, so gzdopen
- will not detect if fd is invalid (unless fd is -1).
-*/
-
-ZEXTERN int ZEXPORT gzbuffer OF((gzFile file, unsigned size));
-/*
- Set the internal buffer size used by this library's functions. The
- default buffer size is 8192 bytes. This function must be called after
- gzopen() or gzdopen(), and before any other calls that read or write the
- file. The buffer memory allocation is always deferred to the first read or
- write. Three times that size in buffer space is allocated. A larger buffer
- size of, for example, 64K or 128K bytes will noticeably increase the speed
- of decompression (reading).
-
- The new buffer size also affects the maximum length for gzprintf().
-
- gzbuffer() returns 0 on success, or -1 on failure, such as being called
- too late.
-*/
-
-ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy));
-/*
- Dynamically update the compression level or strategy. See the description
- of deflateInit2 for the meaning of these parameters. Previously provided
- data is flushed before the parameter change.
-
- gzsetparams returns Z_OK if success, Z_STREAM_ERROR if the file was not
- opened for writing, Z_ERRNO if there is an error writing the flushed data,
- or Z_MEM_ERROR if there is a memory allocation error.
-*/
-
-ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len));
-/*
- Reads the given number of uncompressed bytes from the compressed file. If
- the input file is not in gzip format, gzread copies the given number of
- bytes into the buffer directly from the file.
-
- After reaching the end of a gzip stream in the input, gzread will continue
- to read, looking for another gzip stream. Any number of gzip streams may be
- concatenated in the input file, and will all be decompressed by gzread().
- If something other than a gzip stream is encountered after a gzip stream,
- that remaining trailing garbage is ignored (and no error is returned).
-
- gzread can be used to read a gzip file that is being concurrently written.
- Upon reaching the end of the input, gzread will return with the available
- data. If the error code returned by gzerror is Z_OK or Z_BUF_ERROR, then
- gzclearerr can be used to clear the end of file indicator in order to permit
- gzread to be tried again. Z_OK indicates that a gzip stream was completed
- on the last gzread. Z_BUF_ERROR indicates that the input file ended in the
- middle of a gzip stream. Note that gzread does not return -1 in the event
- of an incomplete gzip stream. This error is deferred until gzclose(), which
- will return Z_BUF_ERROR if the last gzread ended in the middle of a gzip
- stream. Alternatively, gzerror can be used before gzclose to detect this
- case.
-
- gzread returns the number of uncompressed bytes actually read, less than
- len for end of file, or -1 for error. If len is too large to fit in an int,
- then nothing is read, -1 is returned, and the error state is set to
- Z_STREAM_ERROR.
-*/
-
-ZEXTERN z_size_t ZEXPORT gzfread OF((voidp buf, z_size_t size, z_size_t nitems,
- gzFile file));
-/*
- Read up to nitems items of size size from file to buf, otherwise operating
- as gzread() does. This duplicates the interface of stdio's fread(), with
- size_t request and return types. If the library defines size_t, then
- z_size_t is identical to size_t. If not, then z_size_t is an unsigned
- integer type that can contain a pointer.
-
- gzfread() returns the number of full items read of size size, or zero if
- the end of the file was reached and a full item could not be read, or if
- there was an error. gzerror() must be consulted if zero is returned in
- order to determine if there was an error. If the multiplication of size and
- nitems overflows, i.e. the product does not fit in a z_size_t, then nothing
- is read, zero is returned, and the error state is set to Z_STREAM_ERROR.
-
- In the event that the end of file is reached and only a partial item is
- available at the end, i.e. the remaining uncompressed data length is not a
- multiple of size, then the final partial item is nevetheless read into buf
- and the end-of-file flag is set. The length of the partial item read is not
- provided, but could be inferred from the result of gztell(). This behavior
- is the same as the behavior of fread() implementations in common libraries,
- but it prevents the direct use of gzfread() to read a concurrently written
- file, reseting and retrying on end-of-file, when size is not 1.
-*/
-
-ZEXTERN int ZEXPORT gzwrite OF((gzFile file,
- voidpc buf, unsigned len));
-/*
- Writes the given number of uncompressed bytes into the compressed file.
- gzwrite returns the number of uncompressed bytes written or 0 in case of
- error.
-*/
-
-ZEXTERN z_size_t ZEXPORT gzfwrite OF((voidpc buf, z_size_t size,
- z_size_t nitems, gzFile file));
-/*
- gzfwrite() writes nitems items of size size from buf to file, duplicating
- the interface of stdio's fwrite(), with size_t request and return types. If
- the library defines size_t, then z_size_t is identical to size_t. If not,
- then z_size_t is an unsigned integer type that can contain a pointer.
-
- gzfwrite() returns the number of full items written of size size, or zero
- if there was an error. If the multiplication of size and nitems overflows,
- i.e. the product does not fit in a z_size_t, then nothing is written, zero
- is returned, and the error state is set to Z_STREAM_ERROR.
-*/
-
-ZEXTERN int ZEXPORTVA gzprintf Z_ARG((gzFile file, const char *format, ...));
-/*
- Converts, formats, and writes the arguments to the compressed file under
- control of the format string, as in fprintf. gzprintf returns the number of
- uncompressed bytes actually written, or a negative zlib error code in case
- of error. The number of uncompressed bytes written is limited to 8191, or
- one less than the buffer size given to gzbuffer(). The caller should assure
- that this limit is not exceeded. If it is exceeded, then gzprintf() will
- return an error (0) with nothing written. In this case, there may also be a
- buffer overflow with unpredictable consequences, which is possible only if
- zlib was compiled with the insecure functions sprintf() or vsprintf()
- because the secure snprintf() or vsnprintf() functions were not available.
- This can be determined using zlibCompileFlags().
-*/
-
-ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s));
-/*
- Writes the given null-terminated string to the compressed file, excluding
- the terminating null character.
-
- gzputs returns the number of characters written, or -1 in case of error.
-*/
-
-ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len));
-/*
- Reads bytes from the compressed file until len-1 characters are read, or a
- newline character is read and transferred to buf, or an end-of-file
- condition is encountered. If any characters are read or if len == 1, the
- string is terminated with a null character. If no characters are read due
- to an end-of-file or len < 1, then the buffer is left untouched.
-
- gzgets returns buf which is a null-terminated string, or it returns NULL
- for end-of-file or in case of error. If there was an error, the contents at
- buf are indeterminate.
-*/
-
-ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c));
-/*
- Writes c, converted to an unsigned char, into the compressed file. gzputc
- returns the value that was written, or -1 in case of error.
-*/
-
-ZEXTERN int ZEXPORT gzgetc OF((gzFile file));
-/*
- Reads one byte from the compressed file. gzgetc returns this byte or -1
- in case of end of file or error. This is implemented as a macro for speed.
- As such, it does not do all of the checking the other functions do. I.e.
- it does not check to see if file is NULL, nor whether the structure file
- points to has been clobbered or not.
-*/
-
-ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file));
-/*
- Push one character back onto the stream to be read as the first character
- on the next read. At least one character of push-back is allowed.
- gzungetc() returns the character pushed, or -1 on failure. gzungetc() will
- fail if c is -1, and may fail if a character has been pushed but not read
- yet. If gzungetc is used immediately after gzopen or gzdopen, at least the
- output buffer size of pushed characters is allowed. (See gzbuffer above.)
- The pushed character will be discarded if the stream is repositioned with
- gzseek() or gzrewind().
-*/
-
-ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush));
-/*
- Flushes all pending output into the compressed file. The parameter flush
- is as in the deflate() function. The return value is the zlib error number
- (see function gzerror below). gzflush is only permitted when writing.
-
- If the flush parameter is Z_FINISH, the remaining data is written and the
- gzip stream is completed in the output. If gzwrite() is called again, a new
- gzip stream will be started in the output. gzread() is able to read such
- concatenated gzip streams.
-
- gzflush should be called only when strictly necessary because it will
- degrade compression if called too often.
-*/
-
-/*
-ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file,
- z_off_t offset, int whence));
-
- Sets the starting position for the next gzread or gzwrite on the given
- compressed file. The offset represents a number of bytes in the
- uncompressed data stream. The whence parameter is defined as in lseek(2);
- the value SEEK_END is not supported.
-
- If the file is opened for reading, this function is emulated but can be
- extremely slow. If the file is opened for writing, only forward seeks are
- supported; gzseek then compresses a sequence of zeroes up to the new
- starting position.
-
- gzseek returns the resulting offset location as measured in bytes from
- the beginning of the uncompressed stream, or -1 in case of error, in
- particular if the file is opened for writing and the new starting position
- would be before the current position.
-*/
-
-ZEXTERN int ZEXPORT gzrewind OF((gzFile file));
-/*
- Rewinds the given file. This function is supported only for reading.
-
- gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET)
-*/
-
-/*
-ZEXTERN z_off_t ZEXPORT gztell OF((gzFile file));
-
- Returns the starting position for the next gzread or gzwrite on the given
- compressed file. This position represents a number of bytes in the
- uncompressed data stream, and is zero when starting, even if appending or
- reading a gzip stream from the middle of a file using gzdopen().
-
- gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR)
-*/
-
-/*
-ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile file));
-
- Returns the current offset in the file being read or written. This offset
- includes the count of bytes that precede the gzip stream, for example when
- appending or when using gzdopen() for reading. When reading, the offset
- does not include as yet unused buffered input. This information can be used
- for a progress indicator. On error, gzoffset() returns -1.
-*/
-
-ZEXTERN int ZEXPORT gzeof OF((gzFile file));
-/*
- Returns true (1) if the end-of-file indicator has been set while reading,
- false (0) otherwise. Note that the end-of-file indicator is set only if the
- read tried to go past the end of the input, but came up short. Therefore,
- just like feof(), gzeof() may return false even if there is no more data to
- read, in the event that the last read request was for the exact number of
- bytes remaining in the input file. This will happen if the input file size
- is an exact multiple of the buffer size.
-
- If gzeof() returns true, then the read functions will return no more data,
- unless the end-of-file indicator is reset by gzclearerr() and the input file
- has grown since the previous end of file was detected.
-*/
-
-ZEXTERN int ZEXPORT gzdirect OF((gzFile file));
-/*
- Returns true (1) if file is being copied directly while reading, or false
- (0) if file is a gzip stream being decompressed.
-
- If the input file is empty, gzdirect() will return true, since the input
- does not contain a gzip stream.
-
- If gzdirect() is used immediately after gzopen() or gzdopen() it will
- cause buffers to be allocated to allow reading the file to determine if it
- is a gzip file. Therefore if gzbuffer() is used, it should be called before
- gzdirect().
-
- When writing, gzdirect() returns true (1) if transparent writing was
- requested ("wT" for the gzopen() mode), or false (0) otherwise. (Note:
- gzdirect() is not needed when writing. Transparent writing must be
- explicitly requested, so the application already knows the answer. When
- linking statically, using gzdirect() will include all of the zlib code for
- gzip file reading and decompression, which may not be desired.)
-*/
-
-ZEXTERN int ZEXPORT gzclose OF((gzFile file));
-/*
- Flushes all pending output if necessary, closes the compressed file and
- deallocates the (de)compression state. Note that once file is closed, you
- cannot call gzerror with file, since its structures have been deallocated.
- gzclose must not be called more than once on the same file, just as free
- must not be called more than once on the same allocation.
-
- gzclose will return Z_STREAM_ERROR if file is not valid, Z_ERRNO on a
- file operation error, Z_MEM_ERROR if out of memory, Z_BUF_ERROR if the
- last read ended in the middle of a gzip stream, or Z_OK on success.
-*/
-
-ZEXTERN int ZEXPORT gzclose_r OF((gzFile file));
-ZEXTERN int ZEXPORT gzclose_w OF((gzFile file));
-/*
- Same as gzclose(), but gzclose_r() is only for use when reading, and
- gzclose_w() is only for use when writing or appending. The advantage to
- using these instead of gzclose() is that they avoid linking in zlib
- compression or decompression code that is not used when only reading or only
- writing respectively. If gzclose() is used, then both compression and
- decompression code will be included the application when linking to a static
- zlib library.
-*/
-
-ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum));
-/*
- Returns the error message for the last error which occurred on the given
- compressed file. errnum is set to zlib error number. If an error occurred
- in the file system and not in the compression library, errnum is set to
- Z_ERRNO and the application may consult errno to get the exact error code.
-
- The application must not modify the returned string. Future calls to
- this function may invalidate the previously returned string. If file is
- closed, then the string previously returned by gzerror will no longer be
- available.
-
- gzerror() should be used to distinguish errors from end-of-file for those
- functions above that do not distinguish those cases in their return values.
-*/
-
-ZEXTERN void ZEXPORT gzclearerr OF((gzFile file));
-/*
- Clears the error and end-of-file flags for file. This is analogous to the
- clearerr() function in stdio. This is useful for continuing to read a gzip
- file that is being written concurrently.
-*/
-
-#endif /* !Z_SOLO */
-
- /* checksum functions */
-
-/*
- These functions are not related to compression but are exported
- anyway because they might be useful in applications using the compression
- library.
-*/
-
-ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
-/*
- Update a running Adler-32 checksum with the bytes buf[0..len-1] and
- return the updated checksum. If buf is Z_NULL, this function returns the
- required initial value for the checksum.
-
- An Adler-32 checksum is almost as reliable as a CRC-32 but can be computed
- much faster.
-
- Usage example:
-
- uLong adler = adler32(0L, Z_NULL, 0);
-
- while (read_buffer(buffer, length) != EOF) {
- adler = adler32(adler, buffer, length);
- }
- if (adler != original_adler) error();
-*/
-
-ZEXTERN uLong ZEXPORT adler32_z OF((uLong adler, const Bytef *buf,
- z_size_t len));
-/*
- Same as adler32(), but with a size_t length.
-*/
-
-/*
-ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2,
- z_off_t len2));
-
- Combine two Adler-32 checksums into one. For two sequences of bytes, seq1
- and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for
- each, adler1 and adler2. adler32_combine() returns the Adler-32 checksum of
- seq1 and seq2 concatenated, requiring only adler1, adler2, and len2. Note
- that the z_off_t type (like off_t) is a signed integer. If len2 is
- negative, the result has no meaning or utility.
-*/
-
-ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len));
-/*
- Update a running CRC-32 with the bytes buf[0..len-1] and return the
- updated CRC-32. If buf is Z_NULL, this function returns the required
- initial value for the crc. Pre- and post-conditioning (one's complement) is
- performed within this function so it shouldn't be done by the application.
-
- Usage example:
-
- uLong crc = crc32(0L, Z_NULL, 0);
-
- while (read_buffer(buffer, length) != EOF) {
- crc = crc32(crc, buffer, length);
- }
- if (crc != original_crc) error();
-*/
-
-ZEXTERN uLong ZEXPORT crc32_z OF((uLong adler, const Bytef *buf,
- z_size_t len));
-/*
- Same as crc32(), but with a size_t length.
-*/
-
-/*
-ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2));
-
- Combine two CRC-32 check values into one. For two sequences of bytes,
- seq1 and seq2 with lengths len1 and len2, CRC-32 check values were
- calculated for each, crc1 and crc2. crc32_combine() returns the CRC-32
- check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and
- len2.
-*/
-
-
- /* various hacks, don't look :) */
-
-/* deflateInit and inflateInit are macros to allow checking the zlib version
- * and the compiler's view of z_stream:
- */
-ZEXTERN int ZEXPORT deflateInit_ OF((z_streamp strm, int level,
- const char *version, int stream_size));
-ZEXTERN int ZEXPORT inflateInit_ OF((z_streamp strm,
- const char *version, int stream_size));
-ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int level, int method,
- int windowBits, int memLevel,
- int strategy, const char *version,
- int stream_size));
-ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int windowBits,
- const char *version, int stream_size));
-ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits,
- unsigned char FAR *window,
- const char *version,
- int stream_size));
-#ifdef Z_PREFIX_SET
-# define z_deflateInit(strm, level) \
- deflateInit_((strm), (level), ZLIB_VERSION, (int)sizeof(z_stream))
-# define z_inflateInit(strm) \
- inflateInit_((strm), ZLIB_VERSION, (int)sizeof(z_stream))
-# define z_deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
- deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\
- (strategy), ZLIB_VERSION, (int)sizeof(z_stream))
-# define z_inflateInit2(strm, windowBits) \
- inflateInit2_((strm), (windowBits), ZLIB_VERSION, \
- (int)sizeof(z_stream))
-# define z_inflateBackInit(strm, windowBits, window) \
- inflateBackInit_((strm), (windowBits), (window), \
- ZLIB_VERSION, (int)sizeof(z_stream))
-#else
-# define deflateInit(strm, level) \
- deflateInit_((strm), (level), ZLIB_VERSION, (int)sizeof(z_stream))
-# define inflateInit(strm) \
- inflateInit_((strm), ZLIB_VERSION, (int)sizeof(z_stream))
-# define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
- deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\
- (strategy), ZLIB_VERSION, (int)sizeof(z_stream))
-# define inflateInit2(strm, windowBits) \
- inflateInit2_((strm), (windowBits), ZLIB_VERSION, \
- (int)sizeof(z_stream))
-# define inflateBackInit(strm, windowBits, window) \
- inflateBackInit_((strm), (windowBits), (window), \
- ZLIB_VERSION, (int)sizeof(z_stream))
-#endif
-
-#ifndef Z_SOLO
-
-/* gzgetc() macro and its supporting function and exposed data structure. Note
- * that the real internal state is much larger than the exposed structure.
- * This abbreviated structure exposes just enough for the gzgetc() macro. The
- * user should not mess with these exposed elements, since their names or
- * behavior could change in the future, perhaps even capriciously. They can
- * only be used by the gzgetc() macro. You have been warned.
- */
-struct gzFile_s {
- unsigned have;
- unsigned char *next;
- z_off64_t pos;
-};
-ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file)); /* backward compatibility */
-#ifdef Z_PREFIX_SET
-# undef z_gzgetc
-# define z_gzgetc(g) \
- ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : (gzgetc)(g))
-#else
-# define gzgetc(g) \
- ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : (gzgetc)(g))
-#endif
-
-/* provide 64-bit offset functions if _LARGEFILE64_SOURCE defined, and/or
- * change the regular functions to 64 bits if _FILE_OFFSET_BITS is 64 (if
- * both are true, the application gets the *64 functions, and the regular
- * functions are changed to 64 bits) -- in case these are set on systems
- * without large file support, _LFS64_LARGEFILE must also be true
- */
-#ifdef Z_LARGE64
- ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
- ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
- ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
- ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
- ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off64_t));
- ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off64_t));
-#endif
-
-#if !defined(ZLIB_INTERNAL) && defined(Z_WANT64)
-# ifdef Z_PREFIX_SET
-# define z_gzopen z_gzopen64
-# define z_gzseek z_gzseek64
-# define z_gztell z_gztell64
-# define z_gzoffset z_gzoffset64
-# define z_adler32_combine z_adler32_combine64
-# define z_crc32_combine z_crc32_combine64
-# else
-# define gzopen gzopen64
-# define gzseek gzseek64
-# define gztell gztell64
-# define gzoffset gzoffset64
-# define adler32_combine adler32_combine64
-# define crc32_combine crc32_combine64
-# endif
-# ifndef Z_LARGE64
- ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
- ZEXTERN z_off_t ZEXPORT gzseek64 OF((gzFile, z_off_t, int));
- ZEXTERN z_off_t ZEXPORT gztell64 OF((gzFile));
- ZEXTERN z_off_t ZEXPORT gzoffset64 OF((gzFile));
- ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off_t));
- ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off_t));
-# endif
-#else
- ZEXTERN gzFile ZEXPORT gzopen OF((const char *, const char *));
- ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile, z_off_t, int));
- ZEXTERN z_off_t ZEXPORT gztell OF((gzFile));
- ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile));
- ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t));
- ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t));
-#endif
-
-#else /* Z_SOLO */
-
- ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t));
- ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t));
-
-#endif /* !Z_SOLO */
-
-/* undocumented functions */
-ZEXTERN const char * ZEXPORT zError OF((int));
-ZEXTERN int ZEXPORT inflateSyncPoint OF((z_streamp));
-ZEXTERN const z_crc_t FAR * ZEXPORT get_crc_table OF((void));
-ZEXTERN int ZEXPORT inflateUndermine OF((z_streamp, int));
-ZEXTERN int ZEXPORT inflateValidate OF((z_streamp, int));
-ZEXTERN unsigned long ZEXPORT inflateCodesUsed OF ((z_streamp));
-ZEXTERN int ZEXPORT inflateResetKeep OF((z_streamp));
-ZEXTERN int ZEXPORT deflateResetKeep OF((z_streamp));
-#if (defined(_WIN32) || defined(__CYGWIN__)) && !defined(Z_SOLO)
-ZEXTERN gzFile ZEXPORT gzopen_w OF((const wchar_t *path,
- const char *mode));
-#endif
-#if defined(STDC) || defined(Z_HAVE_STDARG_H)
-# ifndef Z_SOLO
-ZEXTERN int ZEXPORTVA gzvprintf Z_ARG((gzFile file,
- const char *format,
- va_list va));
-# endif
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* ZLIB_H */
diff --git a/lib/sqfs/comp/zlib/zutil.c b/lib/sqfs/comp/zlib/zutil.c
deleted file mode 100644
index 5c9625f..0000000
--- a/lib/sqfs/comp/zlib/zutil.c
+++ /dev/null
@@ -1,331 +0,0 @@
-/* zutil.c -- target dependent utility functions for the compression library
- * Copyright (C) 1995-2017 Jean-loup Gailly
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* @(#) $Id$ */
-
-#include "zutil.h"
-
-/*
- XXX: Not original zlib source code. The following 3 lines were
- commented out by David Oberhollenzer for use in in libsquashfs.
-
-#ifndef Z_SOLO
-# include "gzguts.h"
-#endif
-*/
-
-z_const char * const z_errmsg[10] = {
- (z_const char *)"need dictionary", /* Z_NEED_DICT 2 */
- (z_const char *)"stream end", /* Z_STREAM_END 1 */
- (z_const char *)"", /* Z_OK 0 */
- (z_const char *)"file error", /* Z_ERRNO (-1) */
- (z_const char *)"stream error", /* Z_STREAM_ERROR (-2) */
- (z_const char *)"data error", /* Z_DATA_ERROR (-3) */
- (z_const char *)"insufficient memory", /* Z_MEM_ERROR (-4) */
- (z_const char *)"buffer error", /* Z_BUF_ERROR (-5) */
- (z_const char *)"incompatible version",/* Z_VERSION_ERROR (-6) */
- (z_const char *)""
-};
-
-
-const char * ZEXPORT zlibVersion()
-{
- return ZLIB_VERSION;
-}
-
-uLong ZEXPORT zlibCompileFlags()
-{
- uLong flags;
-
- flags = 0;
- switch ((int)(sizeof(uInt))) {
- case 2: break;
- case 4: flags += 1; break;
- case 8: flags += 2; break;
- default: flags += 3;
- }
- switch ((int)(sizeof(uLong))) {
- case 2: break;
- case 4: flags += 1 << 2; break;
- case 8: flags += 2 << 2; break;
- default: flags += 3 << 2;
- }
- switch ((int)(sizeof(voidpf))) {
- case 2: break;
- case 4: flags += 1 << 4; break;
- case 8: flags += 2 << 4; break;
- default: flags += 3 << 4;
- }
- switch ((int)(sizeof(z_off_t))) {
- case 2: break;
- case 4: flags += 1 << 6; break;
- case 8: flags += 2 << 6; break;
- default: flags += 3 << 6;
- }
-#ifdef ZLIB_DEBUG
- flags += 1 << 8;
-#endif
-#if defined(ASMV) || defined(ASMINF)
- flags += 1 << 9;
-#endif
-#ifdef ZLIB_WINAPI
- flags += 1 << 10;
-#endif
-#ifdef BUILDFIXED
- flags += 1 << 12;
-#endif
-#ifdef DYNAMIC_CRC_TABLE
- flags += 1 << 13;
-#endif
-#ifdef NO_GZCOMPRESS
- flags += 1L << 16;
-#endif
-#ifdef NO_GZIP
- flags += 1L << 17;
-#endif
-#ifdef PKZIP_BUG_WORKAROUND
- flags += 1L << 20;
-#endif
-#ifdef FASTEST
- flags += 1L << 21;
-#endif
-#if defined(STDC) || defined(Z_HAVE_STDARG_H)
-# ifdef NO_vsnprintf
- flags += 1L << 25;
-# ifdef HAS_vsprintf_void
- flags += 1L << 26;
-# endif
-# else
-# ifdef HAS_vsnprintf_void
- flags += 1L << 26;
-# endif
-# endif
-#else
- flags += 1L << 24;
-# ifdef NO_snprintf
- flags += 1L << 25;
-# ifdef HAS_sprintf_void
- flags += 1L << 26;
-# endif
-# else
-# ifdef HAS_snprintf_void
- flags += 1L << 26;
-# endif
-# endif
-#endif
- return flags;
-}
-
-#ifdef ZLIB_DEBUG
-#include <stdlib.h>
-# ifndef verbose
-# define verbose 0
-# endif
-int ZLIB_INTERNAL z_verbose = verbose;
-
-void ZLIB_INTERNAL z_error (m)
- char *m;
-{
- fprintf(stderr, "%s\n", m);
- exit(1);
-}
-#endif
-
-/* exported to allow conversion of error code to string for compress() and
- * uncompress()
- */
-const char * ZEXPORT zError(err)
- int err;
-{
- return ERR_MSG(err);
-}
-
-#if defined(_WIN32_WCE)
- /* The Microsoft C Run-Time Library for Windows CE doesn't have
- * errno. We define it as a global variable to simplify porting.
- * Its value is always 0 and should not be used.
- */
- int errno = 0;
-#endif
-
-#ifndef HAVE_MEMCPY
-
-void ZLIB_INTERNAL zmemcpy(dest, source, len)
- Bytef* dest;
- const Bytef* source;
- uInt len;
-{
- if (len == 0) return;
- do {
- *dest++ = *source++; /* ??? to be unrolled */
- } while (--len != 0);
-}
-
-int ZLIB_INTERNAL zmemcmp(s1, s2, len)
- const Bytef* s1;
- const Bytef* s2;
- uInt len;
-{
- uInt j;
-
- for (j = 0; j < len; j++) {
- if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
- }
- return 0;
-}
-
-void ZLIB_INTERNAL zmemzero(dest, len)
- Bytef* dest;
- uInt len;
-{
- if (len == 0) return;
- do {
- *dest++ = 0; /* ??? to be unrolled */
- } while (--len != 0);
-}
-#endif
-
-#ifndef Z_SOLO
-
-#ifdef SYS16BIT
-
-#ifdef __TURBOC__
-/* Turbo C in 16-bit mode */
-
-# define MY_ZCALLOC
-
-/* Turbo C malloc() does not allow dynamic allocation of 64K bytes
- * and farmalloc(64K) returns a pointer with an offset of 8, so we
- * must fix the pointer. Warning: the pointer must be put back to its
- * original form in order to free it, use zcfree().
- */
-
-#define MAX_PTR 10
-/* 10*64K = 640K */
-
-local int next_ptr = 0;
-
-typedef struct ptr_table_s {
- voidpf org_ptr;
- voidpf new_ptr;
-} ptr_table;
-
-local ptr_table table[MAX_PTR];
-/* This table is used to remember the original form of pointers
- * to large buffers (64K). Such pointers are normalized with a zero offset.
- * Since MSDOS is not a preemptive multitasking OS, this table is not
- * protected from concurrent access. This hack doesn't work anyway on
- * a protected system like OS/2. Use Microsoft C instead.
- */
-
-voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
-{
- voidpf buf;
- ulg bsize = (ulg)items*size;
-
- (void)opaque;
-
- /* If we allocate less than 65520 bytes, we assume that farmalloc
- * will return a usable pointer which doesn't have to be normalized.
- */
- if (bsize < 65520L) {
- buf = farmalloc(bsize);
- if (*(ush*)&buf != 0) return buf;
- } else {
- buf = farmalloc(bsize + 16L);
- }
- if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
- table[next_ptr].org_ptr = buf;
-
- /* Normalize the pointer to seg:0 */
- *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
- *(ush*)&buf = 0;
- table[next_ptr++].new_ptr = buf;
- return buf;
-}
-
-void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
-{
- int n;
-
- (void)opaque;
-
- if (*(ush*)&ptr != 0) { /* object < 64K */
- farfree(ptr);
- return;
- }
- /* Find the original pointer */
- for (n = 0; n < next_ptr; n++) {
- if (ptr != table[n].new_ptr) continue;
-
- farfree(table[n].org_ptr);
- while (++n < next_ptr) {
- table[n-1] = table[n];
- }
- next_ptr--;
- return;
- }
- Assert(0, "zcfree: ptr not found");
-}
-
-#endif /* __TURBOC__ */
-
-
-#ifdef M_I86
-/* Microsoft C in 16-bit mode */
-
-# define MY_ZCALLOC
-
-#if (!defined(_MSC_VER) || (_MSC_VER <= 600))
-# define _halloc halloc
-# define _hfree hfree
-#endif
-
-voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
-{
- (void)opaque;
- return _halloc((long)items, size);
-}
-
-void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
-{
- (void)opaque;
- _hfree(ptr);
-}
-
-#endif /* M_I86 */
-
-#endif /* SYS16BIT */
-
-
-#ifndef MY_ZCALLOC /* Any system without a special alloc function */
-
-#ifndef STDC
-extern voidp malloc OF((uInt size));
-extern voidp calloc OF((uInt items, uInt size));
-extern void free OF((voidpf ptr));
-#endif
-
-voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
- voidpf opaque;
- unsigned items;
- unsigned size;
-{
- (void)opaque;
- return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
- (voidpf)calloc(items, size);
-}
-
-void ZLIB_INTERNAL zcfree (opaque, ptr)
- voidpf opaque;
- voidpf ptr;
-{
- (void)opaque;
- free(ptr);
-}
-
-#endif /* MY_ZCALLOC */
-
-#endif /* !Z_SOLO */
diff --git a/lib/sqfs/comp/zlib/zutil.h b/lib/sqfs/comp/zlib/zutil.h
deleted file mode 100644
index a5856f8..0000000
--- a/lib/sqfs/comp/zlib/zutil.h
+++ /dev/null
@@ -1,279 +0,0 @@
-/* zutil.h -- internal interface and configuration of the compression library
- * Copyright (C) 1995-2016 Jean-loup Gailly, Mark Adler
- * For conditions of distribution and use, see copyright notice in zlib.h
- */
-
-/* WARNING: this file should *not* be used by applications. It is
- part of the implementation of the compression library and is
- subject to change. Applications should only use zlib.h.
- */
-
-/* @(#) $Id$ */
-
-#ifndef ZUTIL_H
-#define ZUTIL_H
-
-/*
- XXX: Not original zlib source code. The definition of ZLIB_INTRENAL
- was changed by David Oberhollenzer for use in in libsquashfs.
- */
-#if (defined(__GNUC__) || defined(__clang__)) && !defined(_WIN32)
-# define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
-#else
-# define ZLIB_INTERNAL
-#endif
-
-#include "zlib.h"
-
-#if defined(STDC) && !defined(Z_SOLO)
-# if !(defined(_WIN32_WCE) && defined(_MSC_VER))
-# include <stddef.h>
-# endif
-# include <string.h>
-# include <stdlib.h>
-#endif
-
-#ifdef Z_SOLO
- typedef long ptrdiff_t; /* guess -- will be caught if guess is wrong */
-#endif
-
-#ifndef local
-# define local static
-#endif
-/* since "static" is used to mean two completely different things in C, we
- define "local" for the non-static meaning of "static", for readability
- (compile with -Dlocal if your debugger can't find static symbols) */
-
-typedef unsigned char uch;
-typedef uch FAR uchf;
-typedef unsigned short ush;
-typedef ush FAR ushf;
-typedef unsigned long ulg;
-
-/*
- XXX: Not original zlib source code. The visibility of z_errmsg was changed
- to internal by David Oberhollenzer for use in in libsquashfs.
- */
-extern ZLIB_INTERNAL z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
-/* (size given to avoid silly warnings with Visual C++) */
-
-#define ERR_MSG(err) z_errmsg[Z_NEED_DICT-(err)]
-
-#define ERR_RETURN(strm,err) \
- return (strm->msg = ERR_MSG(err), (err))
-/* To be used only when the state is known to be valid */
-
- /* common constants */
-
-#ifndef DEF_WBITS
-# define DEF_WBITS MAX_WBITS
-#endif
-/* default windowBits for decompression. MAX_WBITS is for compression only */
-
-#if MAX_MEM_LEVEL >= 8
-# define DEF_MEM_LEVEL 8
-#else
-# define DEF_MEM_LEVEL MAX_MEM_LEVEL
-#endif
-/* default memLevel */
-
-#define STORED_BLOCK 0
-#define STATIC_TREES 1
-#define DYN_TREES 2
-/* The three kinds of block type */
-
-#define MIN_MATCH 3
-#define MAX_MATCH 258
-/* The minimum and maximum match lengths */
-
-#define PRESET_DICT 0x20 /* preset dictionary flag in zlib header */
-
- /* target dependencies */
-
-#if defined(MSDOS) || (defined(WINDOWS) && !defined(WIN32))
-# define OS_CODE 0x00
-# ifndef Z_SOLO
-# if defined(__TURBOC__) || defined(__BORLANDC__)
-# if (__STDC__ == 1) && (defined(__LARGE__) || defined(__COMPACT__))
- /* Allow compilation with ANSI keywords only enabled */
- void _Cdecl farfree( void *block );
- void *_Cdecl farmalloc( unsigned long nbytes );
-# else
-# include <alloc.h>
-# endif
-# else /* MSC or DJGPP */
-# include <malloc.h>
-# endif
-# endif
-#endif
-
-#ifdef AMIGA
-# define OS_CODE 1
-#endif
-
-#if defined(VAXC) || defined(VMS)
-# define OS_CODE 2
-# define F_OPEN(name, mode) \
- fopen((name), (mode), "mbc=60", "ctx=stm", "rfm=fix", "mrs=512")
-#endif
-
-#ifdef __370__
-# if __TARGET_LIB__ < 0x20000000
-# define OS_CODE 4
-# elif __TARGET_LIB__ < 0x40000000
-# define OS_CODE 11
-# else
-# define OS_CODE 8
-# endif
-#endif
-
-#if defined(ATARI) || defined(atarist)
-# define OS_CODE 5
-#endif
-
-#ifdef OS2
-# define OS_CODE 6
-# if defined(M_I86) && !defined(Z_SOLO)
-# include <malloc.h>
-# endif
-#endif
-
-#if defined(MACOS) || defined(TARGET_OS_MAC)
-# define OS_CODE 7
-# ifndef Z_SOLO
-# if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os
-# include <unix.h> /* for fdopen */
-# else
-# ifndef fdopen
-# define fdopen(fd,mode) NULL /* No fdopen() */
-# endif
-# endif
-# endif
-#endif
-
-#ifdef __acorn
-# define OS_CODE 13
-#endif
-
-#if defined(WIN32) && !defined(__CYGWIN__)
-# define OS_CODE 10
-#endif
-
-#ifdef _BEOS_
-# define OS_CODE 16
-#endif
-
-#ifdef __TOS_OS400__
-# define OS_CODE 18
-#endif
-
-#ifdef __APPLE__
-# define OS_CODE 19
-#endif
-
-#if defined(_BEOS_) || defined(RISCOS)
-# define fdopen(fd,mode) NULL /* No fdopen() */
-#endif
-
-#if (defined(_MSC_VER) && (_MSC_VER > 600)) && !defined __INTERIX
-# if defined(_WIN32_WCE)
-# define fdopen(fd,mode) NULL /* No fdopen() */
-# ifndef _PTRDIFF_T_DEFINED
- typedef int ptrdiff_t;
-# define _PTRDIFF_T_DEFINED
-# endif
-# else
-# define fdopen(fd,type) _fdopen(fd,type)
-# endif
-#endif
-
-#if defined(__BORLANDC__) && !defined(MSDOS)
- #pragma warn -8004
- #pragma warn -8008
- #pragma warn -8066
-#endif
-
-/* provide prototypes for these when building zlib without LFS */
-#if !defined(_WIN32) && \
- (!defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0)
- ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off_t));
- ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off_t));
-#endif
-
- /* common defaults */
-
-#ifndef OS_CODE
-# define OS_CODE 3 /* assume Unix */
-#endif
-
-#ifndef F_OPEN
-# define F_OPEN(name, mode) fopen((name), (mode))
-#endif
-
- /* functions */
-
-#if defined(pyr) || defined(Z_SOLO)
-# define NO_MEMCPY
-#endif
-#if defined(SMALL_MEDIUM) && !defined(_MSC_VER) && !defined(__SC__)
- /* Use our own functions for small and medium model with MSC <= 5.0.
- * You may have to use the same strategy for Borland C (untested).
- * The __SC__ check is for Symantec.
- */
-# define NO_MEMCPY
-#endif
-#if defined(STDC) && !defined(HAVE_MEMCPY) && !defined(NO_MEMCPY)
-# define HAVE_MEMCPY
-#endif
-#ifdef HAVE_MEMCPY
-# ifdef SMALL_MEDIUM /* MSDOS small or medium model */
-# define zmemcpy _fmemcpy
-# define zmemcmp _fmemcmp
-# define zmemzero(dest, len) _fmemset(dest, 0, len)
-# else
-# define zmemcpy memcpy
-# define zmemcmp memcmp
-# define zmemzero(dest, len) memset(dest, 0, len)
-# endif
-#else
- void ZLIB_INTERNAL zmemcpy OF((Bytef* dest, const Bytef* source, uInt len));
- int ZLIB_INTERNAL zmemcmp OF((const Bytef* s1, const Bytef* s2, uInt len));
- void ZLIB_INTERNAL zmemzero OF((Bytef* dest, uInt len));
-#endif
-
-/* Diagnostic functions */
-#ifdef ZLIB_DEBUG
-# include <stdio.h>
- extern int ZLIB_INTERNAL z_verbose;
- extern void ZLIB_INTERNAL z_error OF((char *m));
-# define Assert(cond,msg) {if(!(cond)) z_error(msg);}
-# define Trace(x) {if (z_verbose>=0) fprintf x ;}
-# define Tracev(x) {if (z_verbose>0) fprintf x ;}
-# define Tracevv(x) {if (z_verbose>1) fprintf x ;}
-# define Tracec(c,x) {if (z_verbose>0 && (c)) fprintf x ;}
-# define Tracecv(c,x) {if (z_verbose>1 && (c)) fprintf x ;}
-#else
-# define Assert(cond,msg)
-# define Trace(x)
-# define Tracev(x)
-# define Tracevv(x)
-# define Tracec(c,x)
-# define Tracecv(c,x)
-#endif
-
-#ifndef Z_SOLO
- voidpf ZLIB_INTERNAL zcalloc OF((voidpf opaque, unsigned items,
- unsigned size));
- void ZLIB_INTERNAL zcfree OF((voidpf opaque, voidpf ptr));
-#endif
-
-#define ZALLOC(strm, items, size) \
- (*((strm)->zalloc))((strm)->opaque, (items), (size))
-#define ZFREE(strm, addr) (*((strm)->zfree))((strm)->opaque, (voidpf)(addr))
-#define TRY_FREE(s, p) {if (p) ZFREE(s, p);}
-
-/* Reverse the bytes in a 32-bit value */
-#define ZSWAP32(q) ((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff00) + \
- (((q) & 0xff00) << 8) + (((q) & 0xff) << 24))
-
-#endif /* ZUTIL_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 22:25:10 +0000