1 /* 2 * Copyright (C) 2014 Sergey Senozhatsky. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 */ 9 10 #ifndef _ZCOMP_H_ 11 #define _ZCOMP_H_ 12 13 #include <linux/mutex.h> 14 15 struct zcomp_strm { 16 /* compression/decompression buffer */ 17 void *buffer; 18 /* 19 * The private data of the compression stream, only compression 20 * stream backend can touch this (e.g. compression algorithm 21 * working memory) 22 */ 23 void *private; 24 }; 25 26 /* static compression backend */ 27 struct zcomp_backend { 28 int (*compress)(const unsigned char *src, unsigned char *dst, 29 size_t *dst_len, void *private); 30 31 int (*decompress)(const unsigned char *src, size_t src_len, 32 unsigned char *dst); 33 34 void *(*create)(void); 35 void (*destroy)(void *private); 36 37 const char *name; 38 }; 39 40 /* dynamic per-device compression frontend */ 41 struct zcomp { 42 void *stream; 43 struct zcomp_backend *backend; 44 45 struct zcomp_strm *(*strm_find)(struct zcomp *comp); 46 void (*strm_release)(struct zcomp *comp, struct zcomp_strm *zstrm); 47 void (*destroy)(struct zcomp *comp); 48 }; 49 50 struct zcomp *zcomp_create(const char *comp); 51 void zcomp_destroy(struct zcomp *comp); 52 53 struct zcomp_strm *zcomp_strm_find(struct zcomp *comp); 54 void zcomp_strm_release(struct zcomp *comp, struct zcomp_strm *zstrm); 55 56 int zcomp_compress(struct zcomp *comp, struct zcomp_strm *zstrm, 57 const unsigned char *src, size_t *dst_len); 58 59 int zcomp_decompress(struct zcomp *comp, const unsigned char *src, 60 size_t src_len, unsigned char *dst); 61 #endif /* _ZCOMP_H_ */ 62