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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* xz.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "config.h"
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <lzma.h>
#include "internal.h"
typedef struct {
sqfs_compressor_t base;
size_t block_size;
size_t dict_size;
int flags;
} xz_compressor_t;
typedef struct {
uint32_t dict_size;
uint32_t flags;
} xz_options_t;
static bool is_dict_size_valid(size_t size)
{
size_t x = size & (size - 1);
if (x == 0)
return true;
return size == (x | (x >> 1));
}
static int xz_write_options(sqfs_compressor_t *base, int fd)
{
xz_compressor_t *xz = (xz_compressor_t *)base;
xz_options_t opt;
if (xz->flags == 0 && xz->dict_size == xz->block_size)
return 0;
opt.dict_size = htole32(xz->dict_size);
opt.flags = htole32(xz->flags);
return sqfs_generic_write_options(fd, &opt, sizeof(opt));
}
static int xz_read_options(sqfs_compressor_t *base, int fd)
{
xz_compressor_t *xz = (xz_compressor_t *)base;
xz_options_t opt;
if (sqfs_generic_read_options(fd, &opt, sizeof(opt)))
return -1;
opt.dict_size = le32toh(opt.dict_size);
opt.flags = le32toh(opt.flags);
if (!is_dict_size_valid(opt.dict_size)) {
fputs("Invalid lzma dictionary size.\n", stderr);
return -1;
}
if (opt.flags & ~SQFS_COMP_FLAG_XZ_ALL) {
fputs("Unknown BCJ filter used.\n", stderr);
return -1;
}
xz->flags = opt.flags;
xz->dict_size = opt.dict_size;
return 0;
}
static ssize_t compress(xz_compressor_t *xz, lzma_vli filter,
const uint8_t *in, size_t size,
uint8_t *out, size_t outsize)
{
lzma_filter filters[5];
lzma_options_lzma opt;
size_t written = 0;
lzma_ret ret;
int i = 0;
if (lzma_lzma_preset(&opt, LZMA_PRESET_DEFAULT)) {
fputs("error initializing xz options\n", stderr);
return -1;
}
opt.dict_size = xz->dict_size;
if (filter != LZMA_VLI_UNKNOWN) {
filters[i].id = filter;
filters[i].options = NULL;
++i;
}
filters[i].id = LZMA_FILTER_LZMA2;
filters[i].options = &opt;
++i;
filters[i].id = LZMA_VLI_UNKNOWN;
filters[i].options = NULL;
++i;
ret = lzma_stream_buffer_encode(filters, LZMA_CHECK_CRC32, NULL,
in, size, out, &written, outsize);
if (ret == LZMA_OK)
return (written >= size) ? 0 : written;
if (ret != LZMA_BUF_ERROR) {
fputs("xz block compress failed\n", stderr);
return -1;
}
return 0;
}
static lzma_vli flag_to_vli(int flag)
{
switch (flag) {
case SQFS_COMP_FLAG_XZ_X86:
return LZMA_FILTER_X86;
case SQFS_COMP_FLAG_XZ_POWERPC:
return LZMA_FILTER_POWERPC;
case SQFS_COMP_FLAG_XZ_IA64:
return LZMA_FILTER_IA64;
case SQFS_COMP_FLAG_XZ_ARM:
return LZMA_FILTER_ARM;
case SQFS_COMP_FLAG_XZ_ARMTHUMB:
return LZMA_FILTER_ARMTHUMB;
case SQFS_COMP_FLAG_XZ_SPARC:
return LZMA_FILTER_SPARC;
}
return LZMA_VLI_UNKNOWN;
}
static ssize_t xz_comp_block(sqfs_compressor_t *base, const uint8_t *in,
size_t size, uint8_t *out, size_t outsize)
{
xz_compressor_t *xz = (xz_compressor_t *)base;
lzma_vli filter, selected = LZMA_VLI_UNKNOWN;
size_t i, smallest;
ssize_t ret;
ret = compress(xz, LZMA_VLI_UNKNOWN, in, size, out, outsize);
if (ret < 0 || xz->flags == 0)
return ret;
smallest = ret;
for (i = 0; i & SQFS_COMP_FLAG_XZ_ALL; i <<= 1) {
if ((xz->flags & i) == 0)
continue;
filter = flag_to_vli(i);
ret = compress(xz, filter, in, size, out, outsize);
if (ret < 0)
return -1;
if (ret > 0 && (smallest == 0 || (size_t)ret < smallest)) {
smallest = ret;
selected = filter;
}
}
if (smallest == 0)
return 0;
return compress(xz, selected, in, size, out, outsize);
}
static ssize_t xz_uncomp_block(sqfs_compressor_t *base, const uint8_t *in,
size_t size, uint8_t *out, size_t outsize)
{
uint64_t memlimit = 32 * 1024 * 1024;
size_t dest_pos = 0;
size_t src_pos = 0;
lzma_ret ret;
(void)base;
ret = lzma_stream_buffer_decode(&memlimit, 0, NULL,
in, &src_pos, size,
out, &dest_pos, outsize);
if (ret == LZMA_OK && size == src_pos)
return (ssize_t)dest_pos;
fputs("xz block extract failed\n", stderr);
return -1;
}
static sqfs_compressor_t *xz_create_copy(sqfs_compressor_t *cmp)
{
xz_compressor_t *xz = malloc(sizeof(*xz));
if (xz == NULL) {
perror("creating additional xz compressor");
return NULL;
}
memcpy(xz, cmp, sizeof(*xz));
return (sqfs_compressor_t *)xz;
}
static void xz_destroy(sqfs_compressor_t *base)
{
free(base);
}
sqfs_compressor_t *xz_compressor_create(const sqfs_compressor_config_t *cfg)
{
sqfs_compressor_t *base;
xz_compressor_t *xz;
if (cfg->flags & ~(SQFS_COMP_FLAG_GENERIC_ALL |
SQFS_COMP_FLAG_XZ_ALL)) {
fputs("creating xz compressor: unknown compressor flags\n",
stderr);
return NULL;
}
if (!is_dict_size_valid(cfg->opt.xz.dict_size)) {
fputs("creating xz compressor: invalid dictionary size\n",
stderr);
return NULL;
}
xz = calloc(1, sizeof(*xz));
base = (sqfs_compressor_t *)xz;
if (xz == NULL) {
perror("creating xz compressor");
return NULL;
}
xz->flags = cfg->flags;
xz->dict_size = cfg->opt.xz.dict_size;
xz->block_size = cfg->block_size;
base->destroy = xz_destroy;
base->do_block = (cfg->flags & SQFS_COMP_FLAG_UNCOMPRESS) ?
xz_uncomp_block : xz_comp_block;
base->write_options = xz_write_options;
base->read_options = xz_read_options;
base->create_copy = xz_create_copy;
return base;
}
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