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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include <string.h>
#include <stdio.h>
#include "internal.h"
#include "util.h"
typedef compressor_t *(*compressor_fun_t)(bool compress, size_t block_size);
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
};
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)
{
if (id < SQFS_COMP_MIN || id > SQFS_COMP_MAX)
return NULL;
if (compressors[id] == NULL)
return NULL;
return compressors[id](compress, block_size);
}
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