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/* SPDX-License-Identifier: LGPL-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"
typedef int (*compressor_fun_t)(const sqfs_compressor_config_t *cfg,
sqfs_compressor_t **out);
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,
[SQFS_COMP_LZMA] = lzma_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(sqfs_file_t *file, const void *data, size_t size)
{
sqfs_u8 buffer[64];
sqfs_u16 header;
int ret;
/* XXX: options for all known compressors should fit into this */
if (size >= (sizeof(buffer) - sizeof(header)))
return SQFS_ERROR_INTERNAL;
header = htole16(0x8000 | size);
memcpy(buffer, &header, sizeof(header));
memcpy(buffer + sizeof(header), data, size);
ret = file->write_at(file, sizeof(sqfs_super_t),
buffer, sizeof(header) + size);
if (ret)
return ret;
return sizeof(header) + size;
}
int sqfs_generic_read_options(sqfs_file_t *file, void *data, size_t size)
{
sqfs_u8 buffer[64];
sqfs_u16 header;
int ret;
/* XXX: options for all known compressors should fit into this */
if (size >= (sizeof(buffer) - sizeof(header)))
return SQFS_ERROR_INTERNAL;
ret = file->read_at(file, sizeof(sqfs_super_t),
buffer, sizeof(header) + size);
if (ret)
return ret;
memcpy(&header, buffer, sizeof(header));
if (le16toh(header) != (0x8000 | size))
return SQFS_ERROR_CORRUPTED;
memcpy(data, buffer + 2, size);
return 0;
}
int sqfs_compressor_create(const sqfs_compressor_config_t *cfg,
sqfs_compressor_t **out)
{
sqfs_u8 padd0[sizeof(cfg->opt)];
int ret;
/* check compressor ID */
if (cfg == NULL)
return SQFS_ERROR_ARG_INVALID;
if (cfg->id < SQFS_COMP_MIN || cfg->id > SQFS_COMP_MAX)
return SQFS_ERROR_UNSUPPORTED;
if (compressors[cfg->id] == NULL)
return SQFS_ERROR_UNSUPPORTED;
/* make sure the padding bytes are cleared, so we could theoretically
turn them into option fields in the future and remain compatible */
memset(padd0, 0, sizeof(padd0));
switch (cfg->id) {
case SQFS_COMP_XZ:
ret = memcmp(cfg->opt.xz.padd0, padd0,
sizeof(cfg->opt.xz.padd0));
break;
case SQFS_COMP_LZMA:
ret = memcmp(cfg->opt.lzma.padd0, padd0,
sizeof(cfg->opt.lzma.padd0));
break;
case SQFS_COMP_LZO:
ret = memcmp(cfg->opt.lzo.padd0, padd0,
sizeof(cfg->opt.lzo.padd0));
break;
case SQFS_COMP_GZIP:
ret = memcmp(cfg->opt.gzip.padd0, padd0,
sizeof(cfg->opt.gzip.padd0));
break;
default:
ret = memcmp(cfg->opt.padd0, padd0, sizeof(cfg->opt.padd0));
break;
}
if (ret != 0)
return SQFS_ERROR_ARG_INVALID;
return compressors[cfg->id](cfg, out);
}
const char *sqfs_compressor_name_from_id(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)
{
size_t i;
for (i = 0; i < sizeof(names) / sizeof(names[0]); ++i) {
if (names[i] != NULL && strcmp(names[i], name) == 0)
return i;
}
return SQFS_ERROR_UNSUPPORTED;
}
int sqfs_compressor_config_init(sqfs_compressor_config_t *cfg,
SQFS_COMPRESSOR id,
size_t block_size, sqfs_u16 flags)
{
sqfs_u32 flag_mask = SQFS_COMP_FLAG_GENERIC_ALL;
memset(cfg, 0, sizeof(*cfg));
switch (id) {
case SQFS_COMP_GZIP:
flag_mask |= SQFS_COMP_FLAG_GZIP_ALL;
cfg->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->level = SQFS_LZO_DEFAULT_LEVEL;
break;
case SQFS_COMP_ZSTD:
cfg->level = SQFS_ZSTD_DEFAULT_LEVEL;
break;
case SQFS_COMP_XZ:
flag_mask |= SQFS_COMP_FLAG_XZ_ALL;
cfg->level = SQFS_XZ_DEFAULT_LEVEL;
cfg->opt.xz.dict_size = block_size;
cfg->opt.xz.lc = SQFS_XZ_DEFAULT_LC;
cfg->opt.xz.lp = SQFS_XZ_DEFAULT_LP;
cfg->opt.xz.pb = SQFS_XZ_DEFAULT_PB;
if (block_size < SQFS_XZ_MIN_DICT_SIZE)
cfg->opt.xz.dict_size = SQFS_XZ_MIN_DICT_SIZE;
break;
case SQFS_COMP_LZMA:
flag_mask |= SQFS_COMP_FLAG_LZMA_ALL;
cfg->level = SQFS_LZMA_DEFAULT_LEVEL;
cfg->opt.lzma.dict_size = block_size;
cfg->opt.lzma.lc = SQFS_LZMA_DEFAULT_LC;
cfg->opt.lzma.lp = SQFS_LZMA_DEFAULT_LP;
cfg->opt.lzma.pb = SQFS_LZMA_DEFAULT_PB;
if (block_size < SQFS_LZMA_MIN_DICT_SIZE)
cfg->opt.lzma.dict_size = SQFS_LZMA_MIN_DICT_SIZE;
break;
case SQFS_COMP_LZ4:
flag_mask |= SQFS_COMP_FLAG_LZ4_ALL;
break;
default:
return SQFS_ERROR_UNSUPPORTED;
}
if (flags & ~flag_mask) {
memset(cfg, 0, sizeof(*cfg));
return SQFS_ERROR_UNSUPPORTED;
}
cfg->id = id;
cfg->flags = flags;
cfg->block_size = block_size;
return 0;
}
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