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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "internal.h"
#include "util.h"
typedef compressor_t *(*compressor_fun_t)(bool compress, size_t block_size,
char *options);
typedef void (*compressor_help_fun_t)(void);
static compressor_fun_t compressors[SQFS_COMP_MAX + 1] = {
#ifdef WITH_GZIP
[SQFS_COMP_GZIP] = create_gzip_compressor,
#endif
#ifdef WITH_XZ
[SQFS_COMP_XZ] = create_xz_compressor,
#endif
#ifdef WITH_LZO
[SQFS_COMP_LZO] = create_lzo_compressor,
#endif
#ifdef WITH_LZ4
[SQFS_COMP_LZ4] = create_lz4_compressor,
#endif
#ifdef WITH_ZSTD
[SQFS_COMP_ZSTD] = create_zstd_compressor,
#endif
};
static const compressor_help_fun_t helpfuns[SQFS_COMP_MAX + 1] = {
#ifdef WITH_GZIP
[SQFS_COMP_GZIP] = compressor_gzip_print_help,
#endif
#ifdef WITH_XZ
[SQFS_COMP_XZ] = compressor_xz_print_help,
#endif
#ifdef WITH_LZO
[SQFS_COMP_LZO] = compressor_lzo_print_help,
#endif
#ifdef WITH_LZ4
[SQFS_COMP_LZ4] = compressor_lz4_print_help,
#endif
#ifdef WITH_ZSTD
[SQFS_COMP_ZSTD] = compressor_zstd_print_help,
#endif
};
int generic_write_options(int fd, const void *data, size_t size)
{
uint8_t buffer[size + 2];
ssize_t ret;
*((uint16_t *)buffer) = htole16(0x8000 | size);
memcpy(buffer + 2, data, size);
ret = write_retry(fd, buffer, sizeof(buffer));
if (ret < 0) {
perror("writing compressor options");
return -1;
}
if ((size_t)ret < sizeof(buffer)) {
fputs("writing compressor options: truncated write\n", stderr);
return -1;
}
return ret;
}
int generic_read_options(int fd, void *data, size_t size)
{
uint8_t buffer[size + 2];
ssize_t ret;
ret = read_retry(fd, buffer, sizeof(buffer));
if (ret < 0) {
perror("reading compressor options");
return -1;
}
if ((size_t)ret < sizeof(buffer)) {
fputs("reading compressor options: unexpected end of file\n",
stderr);
return -1;
}
if (le16toh(*((uint16_t *)buffer)) != (0x8000 | size)) {
fputs("reading compressor options: invalid meta data header\n",
stderr);
return -1;
}
memcpy(data, buffer + 2, size);
return 0;
}
bool compressor_exists(E_SQFS_COMPRESSOR id)
{
if (id < SQFS_COMP_MIN || id > SQFS_COMP_MAX)
return false;
return (compressors[id] != NULL);
}
compressor_t *compressor_create(E_SQFS_COMPRESSOR id, bool compress,
size_t block_size, char *options)
{
if (id < SQFS_COMP_MIN || id > SQFS_COMP_MAX)
return NULL;
if (compressors[id] == NULL)
return NULL;
return compressors[id](compress, block_size, options);
}
void compressor_print_help(E_SQFS_COMPRESSOR id)
{
if (id < SQFS_COMP_MIN || id > SQFS_COMP_MAX)
return;
if (compressors[id] == NULL)
return;
helpfuns[id]();
}
E_SQFS_COMPRESSOR compressor_get_default(void)
{
#if defined(WITH_XZ)
return SQFS_COMP_XZ;
#elif defined(WITH_ZSTD)
return SQFS_COMP_ZSTD;
#elif defined(WITH_GZIP)
return SQFS_COMP_GZIP;
#elif defined(WITH_LZO)
return SQFS_COMP_LZO;
#elif defined(WITH_LZ4)
return SQFS_COMP_LZ4;
#else
fputs("No compressor implementation available!\n", stderr);
exit(EXIT_FAILURE);
#endif
}
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