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94f740fc SQK |
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 | /* used in multi stream backend, protected by backend strm_lock */ | |
25 | struct list_head list; | |
26 | }; | |
27 | ||
28 | /* static compression backend */ | |
29 | struct zcomp_backend { | |
30 | int (*compress)(const unsigned char *src, unsigned char *dst, | |
31 | size_t *dst_len, void *private); | |
32 | ||
33 | int (*decompress)(const unsigned char *src, size_t src_len, | |
34 | unsigned char *dst); | |
35 | ||
cd681c03 | 36 | void *(*create)(gfp_t flags); |
94f740fc SQK |
37 | void (*destroy)(void *private); |
38 | ||
39 | const char *name; | |
40 | }; | |
41 | ||
42 | /* dynamic per-device compression frontend */ | |
43 | struct zcomp { | |
44 | void *stream; | |
45 | struct zcomp_backend *backend; | |
46 | ||
47 | struct zcomp_strm *(*strm_find)(struct zcomp *comp); | |
48 | void (*strm_release)(struct zcomp *comp, struct zcomp_strm *zstrm); | |
49 | bool (*set_max_streams)(struct zcomp *comp, int num_strm); | |
50 | void (*destroy)(struct zcomp *comp); | |
51 | }; | |
52 | ||
53 | ssize_t zcomp_available_show(const char *comp, char *buf); | |
6a57d62a | 54 | bool zcomp_available_algorithm(const char *comp); |
94f740fc SQK |
55 | |
56 | struct zcomp *zcomp_create(const char *comp, int max_strm); | |
57 | void zcomp_destroy(struct zcomp *comp); | |
58 | ||
59 | struct zcomp_strm *zcomp_strm_find(struct zcomp *comp); | |
60 | void zcomp_strm_release(struct zcomp *comp, struct zcomp_strm *zstrm); | |
61 | ||
62 | int zcomp_compress(struct zcomp *comp, struct zcomp_strm *zstrm, | |
63 | const unsigned char *src, size_t *dst_len); | |
64 | ||
65 | int zcomp_decompress(struct zcomp *comp, const unsigned char *src, | |
66 | size_t src_len, unsigned char *dst); | |
67 | ||
68 | bool zcomp_set_max_streams(struct zcomp *comp, int num_strm); | |
69 | #endif /* _ZCOMP_H_ */ |