Remove builtin copy of zlib

On GNU/Linux, *BSD or MacOS we can simply use the system default
library. The copy was primarily only there for the Windows build.

The build script for Windows has now been adapted to download and
compile a shared library from a tarball.

This removes a huge chunk of code from the git tree as well as
the release tarballs. Additionally it gets rid of iffy things like
removing the Zlib copyright/version strings, so the libsquashfs DLL
doesn't export it.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 0 insertions, 186 deletions

diff --git a/lib/zlib/adler32.c b/lib/zlib/adler32.c
deleted file mode 100644
index d0be438..0000000
--- a/lib/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);
-}