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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* zstd.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 <zstd.h>
#include <zstd_errors.h>
#include "internal.h"
typedef struct {
sqfs_compressor_t base;
size_t block_size;
ZSTD_CCtx *zctx;
int level;
} zstd_compressor_t;
typedef struct {
sqfs_u32 level;
} zstd_options_t;
static int zstd_write_options(sqfs_compressor_t *base, sqfs_file_t *file)
{
zstd_compressor_t *zstd = (zstd_compressor_t *)base;
zstd_options_t opt;
if (zstd->level == SQFS_ZSTD_DEFAULT_LEVEL)
return 0;
opt.level = htole32(zstd->level);
return sqfs_generic_write_options(file, &opt, sizeof(opt));
}
static int zstd_read_options(sqfs_compressor_t *base, sqfs_file_t *file)
{
zstd_options_t opt;
int ret;
(void)base;
ret = sqfs_generic_read_options(file, &opt, sizeof(opt));
if (ret)
return ret;
opt.level = le32toh(opt.level);
return 0;
}
static sqfs_s32 zstd_comp_block(sqfs_compressor_t *base, const sqfs_u8 *in,
sqfs_u32 size, sqfs_u8 *out, sqfs_u32 outsize)
{
zstd_compressor_t *zstd = (zstd_compressor_t *)base;
size_t ret;
if (size >= 0x7FFFFFFF)
return SQFS_ERROR_ARG_INVALID;
ret = ZSTD_compressCCtx(zstd->zctx, out, outsize, in, size,
zstd->level);
if (ZSTD_isError(ret)) {
if (ZSTD_getErrorCode(ret) == ZSTD_error_dstSize_tooSmall)
return 0;
return SQFS_ERROR_COMPRESSOR;
}
return ret < size ? ret : 0;
}
static sqfs_s32 zstd_uncomp_block(sqfs_compressor_t *base, const sqfs_u8 *in,
sqfs_u32 size, sqfs_u8 *out, sqfs_u32 outsize)
{
size_t ret;
(void)base;
if (outsize >= 0x7FFFFFFF)
return SQFS_ERROR_ARG_INVALID;
ret = ZSTD_decompress(out, outsize, in, size);
if (ZSTD_isError(ret))
return SQFS_ERROR_COMPRESSOR;
return ret;
}
static void zstd_get_configuration(const sqfs_compressor_t *base,
sqfs_compressor_config_t *cfg)
{
const zstd_compressor_t *zstd = (const zstd_compressor_t *)base;
memset(cfg, 0, sizeof(*cfg));
cfg->id = SQFS_COMP_ZSTD;
cfg->block_size = zstd->block_size;
cfg->opt.zstd.level = zstd->level;
if (base->do_block == zstd_uncomp_block)
cfg->flags |= SQFS_COMP_FLAG_UNCOMPRESS;
}
static sqfs_compressor_t *zstd_create_copy(sqfs_compressor_t *cmp)
{
zstd_compressor_t *zstd = malloc(sizeof(*zstd));
if (zstd == NULL)
return NULL;
memcpy(zstd, cmp, sizeof(*zstd));
zstd->zctx = ZSTD_createCCtx();
if (zstd->zctx == NULL) {
free(zstd);
return NULL;
}
return (sqfs_compressor_t *)zstd;
}
static void zstd_destroy(sqfs_object_t *base)
{
zstd_compressor_t *zstd = (zstd_compressor_t *)base;
ZSTD_freeCCtx(zstd->zctx);
free(zstd);
}
sqfs_compressor_t *zstd_compressor_create(const sqfs_compressor_config_t *cfg)
{
zstd_compressor_t *zstd;
sqfs_compressor_t *base;
if (cfg->flags & ~SQFS_COMP_FLAG_GENERIC_ALL)
return NULL;
if (cfg->opt.zstd.level < 1 ||
cfg->opt.zstd.level > ZSTD_maxCLevel()) {
return NULL;
}
zstd = calloc(1, sizeof(*zstd));
base = (sqfs_compressor_t *)zstd;
if (zstd == NULL)
return NULL;
zstd->block_size = cfg->block_size;
zstd->zctx = ZSTD_createCCtx();
if (zstd->zctx == NULL) {
free(zstd);
return NULL;
}
base->get_configuration = zstd_get_configuration;
base->do_block = cfg->flags & SQFS_COMP_FLAG_UNCOMPRESS ?
zstd_uncomp_block : zstd_comp_block;
base->write_options = zstd_write_options;
base->read_options = zstd_read_options;
base->create_copy = zstd_create_copy;
((sqfs_object_t *)base)->destroy = zstd_destroy;
return base;
}
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