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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* compressor.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "config.h"
#include <string.h>
#include <stdlib.h>
#include "internal.h"
#include "util.h"
typedef sqfs_compressor_t *(*compressor_fun_t)
(const sqfs_compressor_config_t *cfg);
static compressor_fun_t compressors[SQFS_COMP_MAX + 1] = {
#ifdef WITH_GZIP
[SQFS_COMP_GZIP] = gzip_compressor_create,
#endif
#ifdef WITH_XZ
[SQFS_COMP_XZ] = xz_compressor_create,
#endif
#ifdef WITH_LZO
[SQFS_COMP_LZO] = lzo_compressor_create,
#endif
#ifdef WITH_LZ4
[SQFS_COMP_LZ4] = lz4_compressor_create,
#endif
#ifdef WITH_ZSTD
[SQFS_COMP_ZSTD] = zstd_compressor_create,
#endif
};
static const char *names[] = {
[SQFS_COMP_GZIP] = "gzip",
[SQFS_COMP_LZMA] = "lzma",
[SQFS_COMP_LZO] = "lzo",
[SQFS_COMP_XZ] = "xz",
[SQFS_COMP_LZ4] = "lz4",
[SQFS_COMP_ZSTD] = "zstd",
};
int sqfs_generic_write_options(int fd, const void *data, size_t size)
{
uint8_t buffer[size + 2];
*((uint16_t *)buffer) = htole16(0x8000 | size);
memcpy(buffer + 2, data, size);
if (write_data("writing compressor options",
fd, buffer, sizeof(buffer))) {
return SQFS_ERROR_IO;
}
return sizeof(buffer);
}
int sqfs_generic_read_options(int fd, void *data, size_t size)
{
uint8_t buffer[size + 2];
if (read_data_at("reading compressor options", sizeof(sqfs_super_t),
fd, buffer, sizeof(buffer))) {
return SQFS_ERROR_IO;
}
if (le16toh(*((uint16_t *)buffer)) != (0x8000 | size))
return SQFS_ERROR_CORRUPTED;
memcpy(data, buffer + 2, size);
return 0;
}
bool sqfs_compressor_exists(E_SQFS_COMPRESSOR id)
{
if (id < SQFS_COMP_MIN || id > SQFS_COMP_MAX)
return false;
return (compressors[id] != NULL);
}
sqfs_compressor_t *sqfs_compressor_create(const sqfs_compressor_config_t *cfg)
{
if (cfg == NULL || cfg->id < SQFS_COMP_MIN || cfg->id > SQFS_COMP_MAX)
return NULL;
if (compressors[cfg->id] == NULL)
return NULL;
return compressors[cfg->id](cfg);
}
const char *sqfs_compressor_name_from_id(E_SQFS_COMPRESSOR id)
{
if (id < 0 || (size_t)id >= sizeof(names) / sizeof(names[0]))
return NULL;
return names[id];
}
int sqfs_compressor_id_from_name(const char *name, E_SQFS_COMPRESSOR *out)
{
size_t i;
for (i = 0; i < sizeof(names) / sizeof(names[0]); ++i) {
if (names[i] != NULL && strcmp(names[i], name) == 0) {
*out = i;
return 0;
}
}
return -1;
}
int sqfs_compressor_config_init(sqfs_compressor_config_t *cfg,
E_SQFS_COMPRESSOR id,
size_t block_size, uint16_t flags)
{
memset(cfg, 0, sizeof(*cfg));
cfg->id = id;
cfg->flags = flags;
cfg->block_size = block_size;
switch (id) {
case SQFS_COMP_GZIP:
cfg->opt.gzip.level = SQFS_GZIP_DEFAULT_LEVEL;
cfg->opt.gzip.window_size = SQFS_GZIP_DEFAULT_WINDOW;
break;
case SQFS_COMP_LZO:
cfg->opt.lzo.algorithm = SQFS_LZO_DEFAULT_ALG;
cfg->opt.lzo.level = SQFS_LZO_DEFAULT_LEVEL;
break;
case SQFS_COMP_ZSTD:
cfg->opt.zstd.level = SQFS_ZSTD_DEFAULT_LEVEL;
break;
case SQFS_COMP_XZ:
cfg->opt.xz.dict_size = block_size;
break;
default:
break;
}
return 0;
}
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