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compress.h
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1 /*
2  * Compress: Compression algorithms under the cryptographic API.
3  *
4  * Copyright 2008 Sony Corporation
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; version 2 of the License.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program.
17  * If not, see <http://www.gnu.org/licenses/>.
18  */
19 
20 #ifndef _CRYPTO_COMPRESS_H
21 #define _CRYPTO_COMPRESS_H
22 
23 #include <linux/crypto.h>
24 
25 
26 struct comp_request {
27  const void *next_in; /* next input byte */
28  void *next_out; /* next output byte */
29  unsigned int avail_in; /* bytes available at next_in */
30  unsigned int avail_out; /* bytes available at next_out */
31 };
32 
34  ZLIB_COMP_LEVEL = 1, /* e.g. Z_DEFAULT_COMPRESSION */
35  ZLIB_COMP_METHOD, /* e.g. Z_DEFLATED */
36  ZLIB_COMP_WINDOWBITS, /* e.g. MAX_WBITS */
37  ZLIB_COMP_MEMLEVEL, /* e.g. DEF_MEM_LEVEL */
38  ZLIB_COMP_STRATEGY, /* e.g. Z_DEFAULT_STRATEGY */
40 };
41 
42 #define ZLIB_COMP_MAX (__ZLIB_COMP_MAX - 1)
43 
44 
46  ZLIB_DECOMP_WINDOWBITS = 1, /* e.g. DEF_WBITS */
48 };
49 
50 #define ZLIB_DECOMP_MAX (__ZLIB_DECOMP_MAX - 1)
51 
52 
53 struct crypto_pcomp {
54  struct crypto_tfm base;
55 };
56 
57 struct pcomp_alg {
58  int (*compress_setup)(struct crypto_pcomp *tfm, void *params,
59  unsigned int len);
60  int (*compress_init)(struct crypto_pcomp *tfm);
62  struct comp_request *req);
64  struct comp_request *req);
65  int (*decompress_setup)(struct crypto_pcomp *tfm, void *params,
66  unsigned int len);
67  int (*decompress_init)(struct crypto_pcomp *tfm);
69  struct comp_request *req);
71  struct comp_request *req);
72 
73  struct crypto_alg base;
74 };
75 
76 extern struct crypto_pcomp *crypto_alloc_pcomp(const char *alg_name, u32 type,
77  u32 mask);
78 
79 static inline struct crypto_tfm *crypto_pcomp_tfm(struct crypto_pcomp *tfm)
80 {
81  return &tfm->base;
82 }
83 
84 static inline void crypto_free_pcomp(struct crypto_pcomp *tfm)
85 {
86  crypto_destroy_tfm(tfm, crypto_pcomp_tfm(tfm));
87 }
88 
89 static inline struct pcomp_alg *__crypto_pcomp_alg(struct crypto_alg *alg)
90 {
91  return container_of(alg, struct pcomp_alg, base);
92 }
93 
94 static inline struct pcomp_alg *crypto_pcomp_alg(struct crypto_pcomp *tfm)
95 {
96  return __crypto_pcomp_alg(crypto_pcomp_tfm(tfm)->__crt_alg);
97 }
98 
99 static inline int crypto_compress_setup(struct crypto_pcomp *tfm,
100  void *params, unsigned int len)
101 {
102  return crypto_pcomp_alg(tfm)->compress_setup(tfm, params, len);
103 }
104 
105 static inline int crypto_compress_init(struct crypto_pcomp *tfm)
106 {
107  return crypto_pcomp_alg(tfm)->compress_init(tfm);
108 }
109 
110 static inline int crypto_compress_update(struct crypto_pcomp *tfm,
111  struct comp_request *req)
112 {
113  return crypto_pcomp_alg(tfm)->compress_update(tfm, req);
114 }
115 
116 static inline int crypto_compress_final(struct crypto_pcomp *tfm,
117  struct comp_request *req)
118 {
119  return crypto_pcomp_alg(tfm)->compress_final(tfm, req);
120 }
121 
122 static inline int crypto_decompress_setup(struct crypto_pcomp *tfm,
123  void *params, unsigned int len)
124 {
125  return crypto_pcomp_alg(tfm)->decompress_setup(tfm, params, len);
126 }
127 
128 static inline int crypto_decompress_init(struct crypto_pcomp *tfm)
129 {
130  return crypto_pcomp_alg(tfm)->decompress_init(tfm);
131 }
132 
133 static inline int crypto_decompress_update(struct crypto_pcomp *tfm,
134  struct comp_request *req)
135 {
136  return crypto_pcomp_alg(tfm)->decompress_update(tfm, req);
137 }
138 
139 static inline int crypto_decompress_final(struct crypto_pcomp *tfm,
140  struct comp_request *req)
141 {
142  return crypto_pcomp_alg(tfm)->decompress_final(tfm, req);
143 }
144 
145 #endif /* _CRYPTO_COMPRESS_H */