mirror of https://gitee.com/openkylin/linux.git
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/*
|
|
* Copyright (C) 2014 Sergey Senozhatsky.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef _ZCOMP_H_
|
|
#define _ZCOMP_H_
|
|
|
|
struct zcomp_strm {
|
|
/* compression/decompression buffer */
|
|
void *buffer;
|
|
/*
|
|
* The private data of the compression stream, only compression
|
|
* stream backend can touch this (e.g. compression algorithm
|
|
* working memory)
|
|
*/
|
|
void *private;
|
|
};
|
|
|
|
/* static compression backend */
|
|
struct zcomp_backend {
|
|
int (*compress)(const unsigned char *src, unsigned char *dst,
|
|
size_t *dst_len, void *private);
|
|
|
|
int (*decompress)(const unsigned char *src, size_t src_len,
|
|
unsigned char *dst);
|
|
|
|
void *(*create)(gfp_t flags);
|
|
void (*destroy)(void *private);
|
|
|
|
const char *name;
|
|
};
|
|
|
|
/* dynamic per-device compression frontend */
|
|
struct zcomp {
|
|
struct zcomp_strm * __percpu *stream;
|
|
struct zcomp_backend *backend;
|
|
struct notifier_block notifier;
|
|
};
|
|
|
|
ssize_t zcomp_available_show(const char *comp, char *buf);
|
|
bool zcomp_available_algorithm(const char *comp);
|
|
|
|
struct zcomp *zcomp_create(const char *comp);
|
|
void zcomp_destroy(struct zcomp *comp);
|
|
|
|
struct zcomp_strm *zcomp_strm_find(struct zcomp *comp);
|
|
void zcomp_strm_release(struct zcomp *comp, struct zcomp_strm *zstrm);
|
|
|
|
int zcomp_compress(struct zcomp *comp, struct zcomp_strm *zstrm,
|
|
const unsigned char *src, size_t *dst_len);
|
|
|
|
int zcomp_decompress(struct zcomp *comp, const unsigned char *src,
|
|
size_t src_len, unsigned char *dst);
|
|
|
|
bool zcomp_set_max_streams(struct zcomp *comp, int num_strm);
|
|
#endif /* _ZCOMP_H_ */
|