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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 <gaoxiang25@huawei.com>
*/
#ifndef __EROFS_LIB_COMPRESSOR_H
#define __EROFS_LIB_COMPRESSOR_H
#include "erofs/defs.h"
struct erofs_compress;
struct erofs_compressor {
const char *name;
int default_level;
int best_level;
int (*init)(struct erofs_compress *c);
int (*exit)(struct erofs_compress *c);
int (*setlevel)(struct erofs_compress *c, int compression_level);
int (*compress_destsize)(const struct erofs_compress *c,
const void *src, unsigned int *srcsize,
void *dst, unsigned int dstsize);
};
struct erofs_compress {
const struct erofs_compressor *alg;
unsigned int compress_threshold;
unsigned int compression_level;
/* *_destsize specific */
unsigned int destsize_alignsize;
unsigned int destsize_redzone_begin;
unsigned int destsize_redzone_end;
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;
int erofs_compress_destsize(const struct erofs_compress *c,
const void *src, unsigned int *srcsize,
void *dst, unsigned int dstsize, bool inblocks);
int erofs_compressor_setlevel(struct erofs_compress *c, int compression_level);
int erofs_compressor_init(struct erofs_compress *c, char *alg_name);
int erofs_compressor_exit(struct erofs_compress *c);
#endif
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