Root/include/crypto/compress.h

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
26struct 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
33enum zlib_comp_params {
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 */
39    __ZLIB_COMP_MAX,
40};
41
42#define ZLIB_COMP_MAX (__ZLIB_COMP_MAX - 1)
43
44
45enum zlib_decomp_params {
46    ZLIB_DECOMP_WINDOWBITS = 1, /* e.g. DEF_WBITS */
47    __ZLIB_DECOMP_MAX,
48};
49
50#define ZLIB_DECOMP_MAX (__ZLIB_DECOMP_MAX - 1)
51
52
53struct crypto_pcomp {
54    struct crypto_tfm base;
55};
56
57struct pcomp_alg {
58    int (*compress_setup)(struct crypto_pcomp *tfm, void *params,
59                  unsigned int len);
60    int (*compress_init)(struct crypto_pcomp *tfm);
61    int (*compress_update)(struct crypto_pcomp *tfm,
62                   struct comp_request *req);
63    int (*compress_final)(struct crypto_pcomp *tfm,
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);
68    int (*decompress_update)(struct crypto_pcomp *tfm,
69                 struct comp_request *req);
70    int (*decompress_final)(struct crypto_pcomp *tfm,
71                struct comp_request *req);
72
73    struct crypto_alg base;
74};
75
76extern struct crypto_pcomp *crypto_alloc_pcomp(const char *alg_name, u32 type,
77                           u32 mask);
78
79static inline struct crypto_tfm *crypto_pcomp_tfm(struct crypto_pcomp *tfm)
80{
81    return &tfm->base;
82}
83
84static inline void crypto_free_pcomp(struct crypto_pcomp *tfm)
85{
86    crypto_destroy_tfm(tfm, crypto_pcomp_tfm(tfm));
87}
88
89static inline struct pcomp_alg *__crypto_pcomp_alg(struct crypto_alg *alg)
90{
91    return container_of(alg, struct pcomp_alg, base);
92}
93
94static 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
99static 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
105static inline int crypto_compress_init(struct crypto_pcomp *tfm)
106{
107    return crypto_pcomp_alg(tfm)->compress_init(tfm);
108}
109
110static 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
116static 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
122static 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
128static inline int crypto_decompress_init(struct crypto_pcomp *tfm)
129{
130    return crypto_pcomp_alg(tfm)->decompress_init(tfm);
131}
132
133static 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
139static 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 */
146

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