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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>
*/
#ifndef __EROFS_LIB_COMPRESSOR_H
#define __EROFS_LIB_COMPRESSOR_H
#include "erofs/defs.h"
struct erofs_compress;
struct erofs_compressor {
int default_level;
int best_level;
u32 default_dictsize;
u32 max_dictsize;
int (*preinit)(struct erofs_compress *c);
int (*exit)(struct erofs_compress *c);
void (*reset)(struct erofs_compress *c);
int (*setlevel)(struct erofs_compress *c, int compression_level);
int (*setdictsize)(struct erofs_compress *c, u32 dict_size,
u32 pclustersize_max);
int (*setextraopts)(struct erofs_compress *c, const char *extraopts);
int (*init)(struct erofs_compress *c);
int (*compress_destsize)(const struct erofs_compress *c,
const void *src, unsigned int *srcsize,
void *dst, unsigned int dstsize);
int (*compress)(const struct erofs_compress *c,
const void *src, unsigned int srcsize,
void *dst, unsigned int dstcapacity);
};
struct erofs_algorithm {
char *name;
const struct erofs_compressor *c;
unsigned int id;
/* its name won't be shown as a supported algorithm */
bool optimisor;
};
struct erofs_compress {
struct erofs_sb_info *sbi;
const struct erofs_algorithm *alg;
unsigned int compress_threshold;
unsigned int compression_level;
unsigned int dict_size;
void *private_data;
};
/* list of compression algorithms */
extern const struct erofs_compressor erofs_compressor_lz4;
extern const struct erofs_compressor erofs_compressor_lz4hc;
extern const struct erofs_compressor erofs_compressor_lzma;
extern const struct erofs_compressor erofs_compressor_deflate;
extern const struct erofs_compressor erofs_compressor_libdeflate;
extern const struct erofs_compressor erofs_compressor_libzstd;
int z_erofs_get_compress_algorithm_id(const struct erofs_compress *c);
int erofs_compress_destsize(const struct erofs_compress *c,
const void *src, unsigned int *srcsize,
void *dst, unsigned int dstsize);
int erofs_compress(const struct erofs_compress *c,
const void *src, unsigned int srcsize,
void *dst, unsigned int dstcapacity);
int erofs_compressor_init(struct erofs_sb_info *sbi, struct erofs_compress *c,
const struct z_erofs_paramset *zset,
u32 pclustersize_max);
int erofs_compressor_exit(struct erofs_compress *c);
void erofs_compressor_reset(struct erofs_compress *c);
#endif
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