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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* lzo.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <lzo/lzo1x.h>
#include "internal.h"
#define LZO_NUM_ALGS (sizeof(lzo_algs) / sizeof(lzo_algs[0]))
typedef int (*lzo_cb_t)(const lzo_bytep src, lzo_uint src_len, lzo_bytep dst,
lzo_uintp dst_len, lzo_voidp wrkmem);
static const struct {
lzo_cb_t compress;
size_t bufsize;
} lzo_algs[] = {
[SQFS_LZO1X_1] = {
.compress = lzo1x_1_compress,
.bufsize = LZO1X_1_MEM_COMPRESS,
},
[SQFS_LZO1X_1_11] = {
.compress = lzo1x_1_11_compress,
.bufsize = LZO1X_1_11_MEM_COMPRESS,
},
[SQFS_LZO1X_1_12] = {
.compress = lzo1x_1_12_compress,
.bufsize = LZO1X_1_12_MEM_COMPRESS,
},
[SQFS_LZO1X_1_15] = {
.compress = lzo1x_1_15_compress,
.bufsize = LZO1X_1_15_MEM_COMPRESS,
},
[SQFS_LZO1X_999] = {
.compress = lzo1x_999_compress,
.bufsize = LZO1X_999_MEM_COMPRESS,
},
};
typedef struct {
compressor_t base;
int algorithm;
int level;
uint8_t buffer[];
} lzo_compressor_t;
typedef struct {
uint32_t algorithm;
uint32_t level;
} lzo_options_t;
static int lzo_write_options(compressor_t *base, int fd)
{
lzo_compressor_t *lzo = (lzo_compressor_t *)base;
lzo_options_t opt;
if (lzo->algorithm == SQFS_LZO_DEFAULT_ALG &&
lzo->level == SQFS_LZO_DEFAULT_LEVEL) {
return 0;
}
opt.algorithm = htole32(lzo->algorithm);
if (lzo->algorithm == SQFS_LZO1X_999) {
opt.level = htole32(lzo->level);
} else {
opt.level = 0;
}
return generic_write_options(fd, &opt, sizeof(opt));
}
static int lzo_read_options(compressor_t *base, int fd)
{
lzo_compressor_t *lzo = (lzo_compressor_t *)base;
lzo_options_t opt;
if (generic_read_options(fd, &opt, sizeof(opt)))
return -1;
lzo->algorithm = le32toh(opt.algorithm);
lzo->level = le32toh(opt.level);
switch(lzo->algorithm) {
case SQFS_LZO1X_1:
case SQFS_LZO1X_1_11:
case SQFS_LZO1X_1_12:
case SQFS_LZO1X_1_15:
if (lzo->level != 0)
goto fail_level;
break;
case SQFS_LZO1X_999:
if (lzo->level < 1 || lzo->level > 9)
goto fail_level;
break;
default:
fputs("Unsupported LZO variant specified.\n", stderr);
return -1;
}
return 0;
fail_level:
fputs("Unsupported LZO compression level specified.\n", stderr);
return -1;
}
static ssize_t lzo_comp_block(compressor_t *base, const uint8_t *in,
size_t size, uint8_t *out, size_t outsize)
{
lzo_compressor_t *lzo = (lzo_compressor_t *)base;
lzo_uint len = outsize;
int ret;
if (lzo->algorithm == SQFS_LZO1X_999 &&
lzo->level != SQFS_LZO_DEFAULT_LEVEL) {
ret = lzo1x_999_compress_level(in, size, out, &len,
lzo->buffer, NULL, 0, 0,
lzo->level);
} else {
ret = lzo_algs[lzo->algorithm].compress(in, size, out,
&len, lzo->buffer);
}
if (ret != LZO_E_OK) {
fputs("LZO compression failed.\n", stderr);
return -1;
}
if (len < size)
return len;
return 0;
}
static ssize_t lzo_uncomp_block(compressor_t *base, const uint8_t *in,
size_t size, uint8_t *out, size_t outsize)
{
lzo_compressor_t *lzo = (lzo_compressor_t *)base;
lzo_uint len = outsize;
int ret;
ret = lzo1x_decompress_safe(in, size, out, &len, lzo->buffer);
if (ret != LZO_E_OK) {
fputs("lzo decompress: input data is corrupted\n", stderr);
return -1;
}
return len;
}
static compressor_t *lzo_create_copy(compressor_t *cmp)
{
lzo_compressor_t *other = (lzo_compressor_t *)cmp;
lzo_compressor_t *lzo;
lzo = alloc_flex(sizeof(*lzo), 1, lzo_algs[other->algorithm].bufsize);
if (lzo == NULL) {
perror("creating additional lzo compressor");
return NULL;
}
memcpy(lzo, other, sizeof(*lzo));
return (compressor_t *)lzo;
}
static void lzo_destroy(compressor_t *base)
{
free(base);
}
compressor_t *create_lzo_compressor(const compressor_config_t *cfg)
{
lzo_compressor_t *lzo;
compressor_t *base;
if (cfg->flags & ~SQFS_COMP_FLAG_GENERIC_ALL) {
fputs("creating lzo compressor: unknown compressor flags\n",
stderr);
return NULL;
}
if (cfg->opt.lzo.algorithm > LZO_NUM_ALGS ||
lzo_algs[cfg->opt.lzo.algorithm].compress == NULL) {
fputs("creating lzo compressor: unknown LZO variant\n",
stderr);
return NULL;
}
if (cfg->opt.lzo.algorithm == SQFS_LZO1X_999) {
if (cfg->opt.lzo.level > SQFS_LZO_MAX_LEVEL) {
fputs("creating lzo compressor: compression level "
"must be between 0 and 9 inclusive\n", stderr);
return NULL;
}
} else if (cfg->opt.lzo.level != 0) {
fputs("creating lzo compressor: level argument "
"only supported by lzo1x 999\n", stderr);
return NULL;
}
lzo = alloc_flex(sizeof(*lzo), 1,
lzo_algs[cfg->opt.lzo.algorithm].bufsize);
base = (compressor_t *)lzo;
if (lzo == NULL) {
perror("creating lzo compressor");
return NULL;
}
lzo->algorithm = cfg->opt.lzo.algorithm;
lzo->level = cfg->opt.lzo.level;
base->destroy = lzo_destroy;
base->do_block = (cfg->flags & SQFS_COMP_FLAG_UNCOMPRESS) ?
lzo_uncomp_block : lzo_comp_block;
base->write_options = lzo_write_options;
base->read_options = lzo_read_options;
base->create_copy = lzo_create_copy;
return base;
}
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