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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
  33 enum 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
  45 enum 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
  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);
  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
  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 */