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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* lz4.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 <lz4.h>
#include <lz4hc.h>
#include "internal.h"
typedef struct {
sqfs_compressor_t base;
size_t block_size;
bool high_compression;
} lz4_compressor_t;
typedef struct {
sqfs_u32 version;
sqfs_u32 flags;
} lz4_options;
#define LZ4LEGACY 1
/* old verions of liblz4 don't have this */
#ifndef LZ4HC_CLEVEL_MAX
#define LZ4HC_CLEVEL_MAX 12
#endif
static int lz4_write_options(sqfs_compressor_t *base, sqfs_file_t *file)
{
lz4_compressor_t *lz4 = (lz4_compressor_t *)base;
lz4_options opt = {
.version = htole32(LZ4LEGACY),
.flags = htole32(lz4->high_compression ?
SQFS_COMP_FLAG_LZ4_HC : 0),
};
return sqfs_generic_write_options(file, &opt, sizeof(opt));
}
static int lz4_read_options(sqfs_compressor_t *base, sqfs_file_t *file)
{
lz4_options opt;
int ret;
(void)base;
ret = sqfs_generic_read_options(file, &opt, sizeof(opt));
if (ret)
return ret;
opt.version = le32toh(opt.version);
opt.flags = le32toh(opt.flags);
if (opt.version != LZ4LEGACY)
return SQFS_ERROR_UNSUPPORTED;
return 0;
}
static sqfs_s32 lz4_comp_block(sqfs_compressor_t *base, const sqfs_u8 *in,
sqfs_u32 size, sqfs_u8 *out, sqfs_u32 outsize)
{
lz4_compressor_t *lz4 = (lz4_compressor_t *)base;
int ret;
if (size >= 0x7FFFFFFF)
return SQFS_ERROR_ARG_INVALID;
if (lz4->high_compression) {
ret = LZ4_compress_HC((const void *)in, (void *)out,
size, outsize, LZ4HC_CLEVEL_MAX);
} else {
ret = LZ4_compress_default((const void *)in, (void *)out,
size, outsize);
}
if (ret < 0)
return SQFS_ERROR_COMPRESSOR;
return ret;
}
static sqfs_s32 lz4_uncomp_block(sqfs_compressor_t *base, const sqfs_u8 *in,
sqfs_u32 size, sqfs_u8 *out, sqfs_u32 outsize)
{
int ret;
(void)base;
if (outsize >= 0x7FFFFFFF)
return SQFS_ERROR_ARG_INVALID;
ret = LZ4_decompress_safe((const void *)in, (void *)out, size, outsize);
if (ret < 0)
return SQFS_ERROR_COMPRESSOR;
return ret;
}
static void lz4_get_configuration(const sqfs_compressor_t *base,
sqfs_compressor_config_t *cfg)
{
const lz4_compressor_t *lz4 = (const lz4_compressor_t *)base;
memset(cfg, 0, sizeof(*cfg));
cfg->id = SQFS_COMP_LZ4;
cfg->block_size = lz4->block_size;
if (lz4->high_compression)
cfg->flags |= SQFS_COMP_FLAG_LZ4_HC;
if (base->do_block == lz4_uncomp_block)
cfg->flags |= SQFS_COMP_FLAG_UNCOMPRESS;
}
static sqfs_object_t *lz4_create_copy(const sqfs_object_t *cmp)
{
lz4_compressor_t *lz4 = malloc(sizeof(*lz4));
if (lz4 == NULL)
return NULL;
memcpy(lz4, cmp, sizeof(*lz4));
return (sqfs_object_t *)lz4;
}
static void lz4_destroy(sqfs_object_t *base)
{
free(base);
}
int lz4_compressor_create(const sqfs_compressor_config_t *cfg,
sqfs_compressor_t **out)
{
sqfs_compressor_t *base;
lz4_compressor_t *lz4;
if (cfg->flags & ~(SQFS_COMP_FLAG_LZ4_ALL |
SQFS_COMP_FLAG_GENERIC_ALL)) {
return SQFS_ERROR_UNSUPPORTED;
}
if (cfg->level != 0)
return SQFS_ERROR_UNSUPPORTED;
lz4 = calloc(1, sizeof(*lz4));
base = (sqfs_compressor_t *)lz4;
if (lz4 == NULL)
return SQFS_ERROR_ALLOC;
sqfs_object_init(lz4, lz4_destroy, lz4_create_copy);
lz4->high_compression = (cfg->flags & SQFS_COMP_FLAG_LZ4_HC) != 0;
lz4->block_size = cfg->block_size;
base->get_configuration = lz4_get_configuration;
base->do_block = (cfg->flags & SQFS_COMP_FLAG_UNCOMPRESS) ?
lz4_uncomp_block : lz4_comp_block;
base->write_options = lz4_write_options;
base->read_options = lz4_read_options;
*out = base;
return 0;
}
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