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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* zstd.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <zstd.h>
#include "internal.h"
typedef struct {
sqfs_compressor_t base;
ZSTD_CCtx *zctx;
int level;
} zstd_compressor_t;
typedef struct {
uint32_t level;
} zstd_options_t;
static int zstd_write_options(sqfs_compressor_t *base, int fd)
{
zstd_compressor_t *zstd = (zstd_compressor_t *)base;
zstd_options_t opt;
(void)fd;
if (zstd->level == SQFS_ZSTD_DEFAULT_LEVEL)
return 0;
opt.level = htole32(zstd->level);
return sqfs_generic_write_options(fd, &opt, sizeof(opt));
}
static int zstd_read_options(sqfs_compressor_t *base, int fd)
{
zstd_options_t opt;
(void)base;
if (sqfs_generic_read_options(fd, &opt, sizeof(opt)))
return -1;
opt.level = le32toh(opt.level);
return 0;
}
static ssize_t zstd_comp_block(sqfs_compressor_t *base, const uint8_t *in,
size_t size, uint8_t *out, size_t outsize)
{
zstd_compressor_t *zstd = (zstd_compressor_t *)base;
size_t ret;
ret = ZSTD_compressCCtx(zstd->zctx, out, outsize, in, size,
zstd->level);
if (ZSTD_isError(ret)) {
fprintf(stderr, "internal error in ZSTD compressor: %s\n",
ZSTD_getErrorName(ret));
return -1;
}
return ret < size ? ret : 0;
}
static ssize_t zstd_uncomp_block(sqfs_compressor_t *base, const uint8_t *in,
size_t size, uint8_t *out, size_t outsize)
{
size_t ret;
(void)base;
ret = ZSTD_decompress(out, outsize, in, size);
if (ZSTD_isError(ret)) {
fprintf(stderr, "error uncompressing ZSTD compressed data: %s",
ZSTD_getErrorName(ret));
return -1;
}
return ret;
}
static sqfs_compressor_t *zstd_create_copy(sqfs_compressor_t *cmp)
{
zstd_compressor_t *zstd = malloc(sizeof(*zstd));
if (zstd == NULL) {
perror("creating additional zstd compressor");
return NULL;
}
memcpy(zstd, cmp, sizeof(*zstd));
zstd->zctx = ZSTD_createCCtx();
if (zstd->zctx == NULL) {
fputs("error creating addtional zstd compression context\n",
stderr);
free(zstd);
return NULL;
}
return (sqfs_compressor_t *)zstd;
}
static void zstd_destroy(sqfs_compressor_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) {
fputs("creating zstd compressor: unknown compressor flags\n",
stderr);
}
if (cfg->opt.zstd.level < 1 ||
cfg->opt.zstd.level > ZSTD_maxCLevel()) {
goto fail_level;
}
zstd = calloc(1, sizeof(*zstd));
base = (sqfs_compressor_t *)zstd;
if (zstd == NULL) {
perror("creating zstd compressor");
return NULL;
}
zstd->zctx = ZSTD_createCCtx();
if (zstd->zctx == NULL) {
fputs("error creating zstd compression context\n", stderr);
free(zstd);
return NULL;
}
base->destroy = zstd_destroy;
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;
return base;
fail_level:
fprintf(stderr, "zstd compression level must be a number in the range "
"1...%d\n", ZSTD_maxCLevel());
return NULL;
}
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