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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* compress.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "xfrm/compress.h"
#include "config.h"
#include <string.h>
static const struct {
int id;
const char *name;
const sqfs_u8 *magic;
size_t count;
xfrm_stream_t *(*mk_comp_stream)(const compressor_config_t *);
xfrm_stream_t *(*mk_decomp_stream)(void);
} compressors[] = {
#ifdef WITH_GZIP
{ XFRM_COMPRESSOR_GZIP, "gzip", (const sqfs_u8 *)"\x1F\x8B\x08", 3,
compressor_stream_gzip_create, decompressor_stream_gzip_create },
#endif
#ifdef WITH_XZ
{ XFRM_COMPRESSOR_XZ, "xz", (const sqfs_u8 *)("\xFD" "7zXZ"), 6,
compressor_stream_xz_create, decompressor_stream_xz_create },
#endif
#if defined(WITH_ZSTD) && defined(HAVE_ZSTD_STREAM)
{ XFRM_COMPRESSOR_ZSTD, "zstd",
(const sqfs_u8 *)"\x28\xB5\x2F\xFD", 4,
compressor_stream_zstd_create, decompressor_stream_zstd_create },
#endif
#ifdef WITH_BZIP2
{ XFRM_COMPRESSOR_BZIP2, "bzip2", (const sqfs_u8 *)"BZh", 3,
compressor_stream_bzip2_create, decompressor_stream_bzip2_create },
#endif
};
int xfrm_compressor_id_from_name(const char *name)
{
size_t i;
for (i = 0; i < sizeof(compressors) / sizeof(compressors[0]); ++i) {
if (strcmp(name, compressors[i].name) == 0)
return compressors[i].id;
}
return -1;
}
int xfrm_compressor_id_from_magic(const void *data, size_t count)
{
size_t i;
int ret;
for (i = 0; i < sizeof(compressors) / sizeof(compressors[0]); ++i) {
if (compressors[i].count > count)
continue;
ret = memcmp(compressors[i].magic, data, compressors[i].count);
if (ret == 0)
return compressors[i].id;
}
return -1;
}
const char *xfrm_compressor_name_from_id(int id)
{
size_t i;
for (i = 0; i < sizeof(compressors) / sizeof(compressors[0]); ++i) {
if (compressors[i].id == id)
return compressors[i].name;
}
return NULL;
}
xfrm_stream_t *compressor_stream_create(int id, const compressor_config_t *cfg)
{
size_t i;
for (i = 0; i < sizeof(compressors) / sizeof(compressors[0]); ++i) {
if (compressors[i].id == id)
return compressors[i].mk_comp_stream(cfg);
}
return NULL;
}
xfrm_stream_t *decompressor_stream_create(int id)
{
size_t i;
for (i = 0; i < sizeof(compressors) / sizeof(compressors[0]); ++i) {
if (compressors[i].id == id)
return compressors[i].mk_decomp_stream();
}
return NULL;
}
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