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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* lzma.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 <lzma.h>
#include "internal.h"
#define LZMA_SIZE_OFFSET (5)
#define LZMA_SIZE_BYTES (8)
#define LZMA_HEADER_SIZE (13)
#define LZMA_DEFAULT_LEVEL (5)
#define MEMLIMIT (32 * 1024 * 1024)
typedef struct {
sqfs_compressor_t base;
size_t block_size;
} lzma_compressor_t;
static int lzma_write_options(sqfs_compressor_t *base, sqfs_file_t *file)
{
(void)base; (void)file;
return 0;
}
static int lzma_read_options(sqfs_compressor_t *base, sqfs_file_t *file)
{
(void)base;
(void)file;
return SQFS_ERROR_UNSUPPORTED;
}
static ssize_t lzma_comp_block(sqfs_compressor_t *base, const sqfs_u8 *in,
size_t size, sqfs_u8 *out, size_t outsize)
{
lzma_compressor_t *lzma = (lzma_compressor_t *)base;
lzma_stream strm = LZMA_STREAM_INIT;
lzma_options_lzma opt;
int ret;
if (outsize < LZMA_HEADER_SIZE)
return 0;
lzma_lzma_preset(&opt, LZMA_DEFAULT_LEVEL);
opt.dict_size = lzma->block_size;
if (lzma_alone_encoder(&strm, &opt) != LZMA_OK) {
lzma_end(&strm);
return SQFS_ERROR_COMPRESSOR;
}
strm.next_out = out;
strm.avail_out = outsize;
strm.next_in = in;
strm.avail_in = size;
ret = lzma_code(&strm, LZMA_FINISH);
lzma_end(&strm);
if (ret != LZMA_STREAM_END)
return ret == LZMA_OK ? 0 : SQFS_ERROR_COMPRESSOR;
if (strm.total_out > size)
return 0;
out[LZMA_SIZE_OFFSET ] = size & 0xFF;
out[LZMA_SIZE_OFFSET + 1] = (size >> 8) & 0xFF;
out[LZMA_SIZE_OFFSET + 2] = (size >> 16) & 0xFF;
out[LZMA_SIZE_OFFSET + 3] = (size >> 24) & 0xFF;
out[LZMA_SIZE_OFFSET + 4] = 0;
out[LZMA_SIZE_OFFSET + 5] = 0;
out[LZMA_SIZE_OFFSET + 6] = 0;
out[LZMA_SIZE_OFFSET + 7] = 0;
return strm.total_out;
}
static ssize_t lzma_uncomp_block(sqfs_compressor_t *base, const sqfs_u8 *in,
size_t size, sqfs_u8 *out, size_t outsize)
{
sqfs_u8 lzma_header[LZMA_HEADER_SIZE];
lzma_stream strm = LZMA_STREAM_INIT;
size_t hdrsize;
int ret;
(void)base;
if (size < sizeof(lzma_header))
return SQFS_ERROR_CORRUPTED;
hdrsize = in[LZMA_SIZE_OFFSET] |
(in[LZMA_SIZE_OFFSET + 1] << 8) |
(in[LZMA_SIZE_OFFSET + 2] << 16) |
(in[LZMA_SIZE_OFFSET + 3] << 24);
if (hdrsize > outsize)
return 0;
if (lzma_alone_decoder(&strm, MEMLIMIT) != LZMA_OK) {
lzma_end(&strm);
return SQFS_ERROR_COMPRESSOR;
}
memcpy(lzma_header, in, sizeof(lzma_header));
memset(lzma_header + LZMA_SIZE_OFFSET, 0xFF, LZMA_SIZE_BYTES);
strm.next_out = out;
strm.avail_out = outsize;
strm.next_in = lzma_header;
strm.avail_in = sizeof(lzma_header);
ret = lzma_code(&strm, LZMA_RUN);
if (ret != LZMA_OK || strm.avail_in != 0) {
lzma_end(&strm);
return SQFS_ERROR_COMPRESSOR;
}
strm.next_in = in + sizeof(lzma_header);
strm.avail_in = size - sizeof(lzma_header);
ret = lzma_code(&strm, LZMA_FINISH);
lzma_end(&strm);
if (ret != LZMA_STREAM_END && ret != LZMA_OK)
return SQFS_ERROR_COMPRESSOR;
if (ret == LZMA_OK) {
if (strm.total_out < hdrsize || strm.avail_in != 0)
return 0;
}
return hdrsize;
}
static sqfs_compressor_t *lzma_create_copy(sqfs_compressor_t *cmp)
{
lzma_compressor_t *copy = malloc(sizeof(*copy));
if (copy != NULL)
memcpy(copy, cmp, sizeof(*copy));
return (sqfs_compressor_t *)copy;
}
static void lzma_destroy(sqfs_compressor_t *base)
{
free(base);
}
sqfs_compressor_t *lzma_compressor_create(const sqfs_compressor_config_t *cfg)
{
sqfs_compressor_t *base;
lzma_compressor_t *lzma;
if (cfg->flags & ~SQFS_COMP_FLAG_GENERIC_ALL)
return NULL;
lzma = calloc(1, sizeof(*lzma));
base = (sqfs_compressor_t *)lzma;
if (lzma == NULL)
return NULL;
lzma->block_size = cfg->block_size;
if (lzma->block_size < SQFS_META_BLOCK_SIZE)
lzma->block_size = SQFS_META_BLOCK_SIZE;
base->destroy = lzma_destroy;
base->do_block = (cfg->flags & SQFS_COMP_FLAG_UNCOMPRESS) ?
lzma_uncomp_block : lzma_comp_block;
base->write_options = lzma_write_options;
base->read_options = lzma_read_options;
base->create_copy = lzma_create_copy;
return base;
}
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