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// SPDX-License-Identifier: GPL-2.0+ OR Apache-2.0
/*
* Copyright (C) 2021 Gao Xiang <xiang@kernel.org>
*/
#include <stdlib.h>
#include "config.h"
#ifdef HAVE_LIBLZMA
#include <lzma.h>
#include "erofs/config.h"
#include "erofs/print.h"
#include "erofs/internal.h"
#include "erofs/atomic.h"
#include "compressor.h"
struct erofs_liblzma_context {
lzma_options_lzma opt;
lzma_stream strm;
};
static int erofs_liblzma_compress_destsize(const struct erofs_compress *c,
const void *src, unsigned int *srcsize,
void *dst, unsigned int dstsize)
{
struct erofs_liblzma_context *ctx = c->private_data;
lzma_stream *strm = &ctx->strm;
lzma_ret ret = lzma_microlzma_encoder(strm, &ctx->opt);
if (ret != LZMA_OK)
return -EFAULT;
strm->next_in = src;
strm->avail_in = *srcsize;
strm->next_out = dst;
strm->avail_out = dstsize;
ret = lzma_code(strm, LZMA_FINISH);
if (ret != LZMA_STREAM_END)
return -EBADMSG;
*srcsize = strm->total_in;
return strm->total_out;
}
static int erofs_compressor_liblzma_exit(struct erofs_compress *c)
{
struct erofs_liblzma_context *ctx = c->private_data;
if (!ctx)
return -EINVAL;
lzma_end(&ctx->strm);
free(ctx);
c->private_data = NULL;
return 0;
}
static int erofs_compressor_liblzma_preinit(struct erofs_compress *c)
{
struct erofs_liblzma_context *ctx;
ctx = malloc(sizeof(*ctx));
if (!ctx)
return -ENOMEM;
ctx->strm = (lzma_stream)LZMA_STREAM_INIT;
DBG_BUGON(c->private_data);
c->private_data = ctx;
return 0;
}
static int erofs_compressor_liblzma_setlevel(struct erofs_compress *c,
int compression_level)
{
struct erofs_liblzma_context *ctx = c->private_data;
u32 preset;
if (compression_level > erofs_compressor_lzma.best_level) {
erofs_err("invalid compression level %d", compression_level);
return -EINVAL;
}
if (compression_level < 0)
preset = LZMA_PRESET_DEFAULT;
else if (compression_level >= 100)
preset = (compression_level - 100) | LZMA_PRESET_EXTREME;
else
preset = compression_level;
if (lzma_lzma_preset(&ctx->opt, preset))
return -EINVAL;
c->compression_level = compression_level;
return 0;
}
static int erofs_compressor_liblzma_setdictsize(struct erofs_compress *c,
u32 dict_size, u32 pclustersize_max)
{
struct erofs_liblzma_context *ctx = c->private_data;
if (!dict_size) {
if (erofs_compressor_lzma.default_dictsize) {
dict_size = erofs_compressor_lzma.default_dictsize;
} else {
dict_size = min_t(u32, Z_EROFS_LZMA_MAX_DICT_SIZE,
pclustersize_max << 2);
if (dict_size < 32768)
dict_size = 32768;
}
}
if (dict_size > Z_EROFS_LZMA_MAX_DICT_SIZE || dict_size < 4096) {
erofs_err("invalid dictionary size %u", dict_size);
return -EINVAL;
}
ctx->opt.dict_size = c->dict_size = dict_size;
return 0;
}
static int erofs_compressor_liblzma_setextraopts(struct erofs_compress *c,
const char *extraopts)
{
struct erofs_liblzma_context *ctx = c->private_data;
const char *token, *next;
for (token = extraopts; *token != '\0'; token = next) {
const char *p = strchr(token, ',');
const char *rhs;
char *endptr;
unsigned long val;
uint32_t *key;
next = NULL;
if (p) {
next = p + 1;
} else {
p = token + strlen(token);
next = p;
}
if (!strncmp(token, "lc=", sizeof("lc=") - 1)) {
key = &ctx->opt.lc;
rhs = token + sizeof("lc=") - 1;
} else if (!strncmp(token, "lp=", sizeof("lp=") - 1)) {
key = &ctx->opt.lp;
rhs = token + sizeof("lp=") - 1;
} else if (!strncmp(token, "pb=", sizeof("pb=") - 1)) {
key = &ctx->opt.pb;
rhs = token + sizeof("pb=") - 1;
} else {
erofs_err("unknown extra options %s", extraopts);
return -EINVAL;
}
val = strtoul(rhs, &endptr, 0);
if (val == ULONG_MAX || endptr != p) {
erofs_err("invalid option %.*s", p - token, token);
return -EINVAL;
}
*key = val;
}
return 0;
}
const struct erofs_compressor erofs_compressor_lzma = {
.default_level = LZMA_PRESET_DEFAULT,
.best_level = 109,
.max_dictsize = Z_EROFS_LZMA_MAX_DICT_SIZE,
.preinit = erofs_compressor_liblzma_preinit,
.exit = erofs_compressor_liblzma_exit,
.setlevel = erofs_compressor_liblzma_setlevel,
.setdictsize = erofs_compressor_liblzma_setdictsize,
.setextraopts = erofs_compressor_liblzma_setextraopts,
.compress_destsize = erofs_liblzma_compress_destsize,
};
#endif
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