linux/include/crypto/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
  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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