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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include "config.h"
#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
};
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 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 -1;
}
return sizeof(buffer);
}
int 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 -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]();
}
void compressor_print_available(void)
{
size_t i;
fputs("Available compressors:\n", stdout);
for (i = 0; i < sizeof(names) / sizeof(names[0]); ++i) {
if (compressor_exists(i))
printf("\t%s\n", names[i]);
}
printf("\nDefault compressor: %s\n", names[compressor_get_default()]);
}
const char *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 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;
}
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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