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// SPDX-License-Identifier: GPL-2.0+ OR Apache-2.0
/*
* Copyright (C) 2018-2019 HUAWEI, Inc.
* http://www.huawei.com/
* Created by Gao Xiang <xiang@kernel.org>
*/
#include "erofs/internal.h"
#include "compressor.h"
#include "erofs/print.h"
static const struct erofs_algorithm erofs_algs[] = {
{ "lz4",
#if LZ4_ENABLED
&erofs_compressor_lz4,
#else
NULL,
#endif
Z_EROFS_COMPRESSION_LZ4, false },
#if LZ4HC_ENABLED
{ "lz4hc", &erofs_compressor_lz4hc,
Z_EROFS_COMPRESSION_LZ4, true },
#endif
{ "lzma",
#if HAVE_LIBLZMA
&erofs_compressor_lzma,
#else
NULL,
#endif
Z_EROFS_COMPRESSION_LZMA, false },
{ "deflate", &erofs_compressor_deflate,
Z_EROFS_COMPRESSION_DEFLATE, false },
#if HAVE_LIBDEFLATE
{ "libdeflate", &erofs_compressor_libdeflate,
Z_EROFS_COMPRESSION_DEFLATE, true },
#endif
{ "zstd",
#ifdef HAVE_LIBZSTD
&erofs_compressor_libzstd,
#else
NULL,
#endif
Z_EROFS_COMPRESSION_ZSTD, false },
};
int z_erofs_get_compress_algorithm_id(const struct erofs_compress *c)
{
DBG_BUGON(!c->alg);
return c->alg->id;
}
const char *z_erofs_list_supported_algorithms(int i, unsigned int *mask)
{
if (i >= ARRAY_SIZE(erofs_algs))
return NULL;
if (!erofs_algs[i].optimisor && (*mask & (1 << erofs_algs[i].id))) {
*mask ^= 1 << erofs_algs[i].id;
return erofs_algs[i].name;
}
return "";
}
const struct erofs_algorithm *z_erofs_list_available_compressors(int *i)
{
for (;*i < ARRAY_SIZE(erofs_algs); ++*i) {
if (!erofs_algs[*i].c)
continue;
return &erofs_algs[(*i)++];
}
return NULL;
}
int erofs_compress_destsize(const struct erofs_compress *c,
const void *src, unsigned int *srcsize,
void *dst, unsigned int dstsize)
{
DBG_BUGON(!c->alg);
if (!c->alg->c->compress_destsize)
return -EOPNOTSUPP;
return c->alg->c->compress_destsize(c, src, srcsize, dst, dstsize);
}
int erofs_compress(const struct erofs_compress *c,
const void *src, unsigned int srcsize,
void *dst, unsigned int dstcapacity)
{
DBG_BUGON(!c->alg);
if (!c->alg->c->compress)
return -EOPNOTSUPP;
return c->alg->c->compress(c, src, srcsize, dst, dstcapacity);
}
int erofs_compressor_exit(struct erofs_compress *c)
{
if (c->alg && c->alg->c->exit)
return c->alg->c->exit(c);
return 0;
}
int erofs_compressor_init(struct erofs_sb_info *sbi, struct erofs_compress *c,
const struct z_erofs_paramset *zset,
u32 pclustersize_max)
{
int ret, i;
c->sbi = sbi;
/* should be written in "minimum compression ratio * 100" */
c->compress_threshold = 100;
c->compression_level = -1;
c->dict_size = 0;
ret = -EINVAL;
for (i = 0; i < ARRAY_SIZE(erofs_algs); ++i) {
if (strcmp(zset->alg, erofs_algs[i].name))
continue;
if (!erofs_algs[i].c)
continue;
if (!erofs_algs[i].c->setlevel && zset->clevel >= 0) {
erofs_err("compression level %d is not supported for %s",
zset->clevel, zset->alg);
return -EINVAL;
}
if (!erofs_algs[i].c->setdictsize && zset->dict_size) {
erofs_err("unsupported dict size for %s", zset->alg);
return -EINVAL;
}
if (!erofs_algs[i].c->setextraopts && zset->extraopts) {
erofs_err("invalid compression option %s for %s",
zset->extraopts, zset->alg);
return -EINVAL;
}
if (erofs_algs[i].c->preinit) {
ret = erofs_algs[i].c->preinit(c);
if (ret)
return ret;
}
if (erofs_algs[i].c->setlevel) {
ret = erofs_algs[i].c->setlevel(c, zset->clevel);
if (ret) {
erofs_err("failed to set compression level %d for %s",
zset->clevel, zset->alg);
goto fail;
}
}
if (erofs_algs[i].c->setdictsize) {
ret = erofs_algs[i].c->setdictsize(c, zset->dict_size,
pclustersize_max);
if (ret) {
erofs_err("failed to set dict size %u for %s",
zset->dict_size, zset->alg);
goto fail;
}
}
if (zset->extraopts && erofs_algs[i].c->setextraopts) {
ret = erofs_algs[i].c->setextraopts(c, zset->extraopts);
if (ret)
goto fail;
}
if (erofs_algs[i].c->init) {
ret = erofs_algs[i].c->init(c);
if (ret)
goto fail;
}
c->alg = &erofs_algs[i];
return 0;
}
erofs_err("Cannot find a valid compressor %s", zset->alg);
return ret;
fail:
if (erofs_algs[i].c->preinit && erofs_algs[i].c->exit)
erofs_algs[i].c->exit(c);
return ret;
}
void erofs_compressor_reset(struct erofs_compress *c)
{
if (c->alg && c->alg->c->reset)
c->alg->c->reset(c);
}
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