/*
* Compress: Compression algorithms under the cryptographic API.
*
* Copyright 2008 Sony Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program.
* If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef _CRYPTO_COMPRESS_H
#define _CRYPTO_COMPRESS_H

#include <linux/crypto.h>


struct comp_request {
const void *next_in; /* next input byte */
void *next_out; /* next output byte */
unsigned int avail_in; /* bytes available at next_in */
unsigned int avail_out; /* bytes available at next_out */
};

enum zlib_comp_params {
ZLIB_COMP_LEVEL = 1, /* e.g. Z_DEFAULT_COMPRESSION */
ZLIB_COMP_METHOD, /* e.g. Z_DEFLATED */
ZLIB_COMP_WINDOWBITS, /* e.g. MAX_WBITS */
ZLIB_COMP_MEMLEVEL, /* e.g. DEF_MEM_LEVEL */
ZLIB_COMP_STRATEGY, /* e.g. Z_DEFAULT_STRATEGY */
__ZLIB_COMP_MAX,
};

#define ZLIB_COMP_MAX (__ZLIB_COMP_MAX - 1)


enum zlib_decomp_params {
ZLIB_DECOMP_WINDOWBITS = 1, /* e.g. DEF_WBITS */
__ZLIB_DECOMP_MAX,
};

#define ZLIB_DECOMP_MAX (__ZLIB_DECOMP_MAX - 1)


struct crypto_pcomp {
struct crypto_tfm base;
};

struct pcomp_alg {
int (*compress_setup)(struct crypto_pcomp *tfm, void *params,
unsigned int len);
int (*compress_init)(struct crypto_pcomp *tfm);
int (*compress_update)(struct crypto_pcomp *tfm,
struct comp_request *req);
int (*compress_final)(struct crypto_pcomp *tfm,
struct comp_request *req);
int (*decompress_setup)(struct crypto_pcomp *tfm, void *params,
unsigned int len);
int (*decompress_init)(struct crypto_pcomp *tfm);
int (*decompress_update)(struct crypto_pcomp *tfm,
struct comp_request *req);
int (*decompress_final)(struct crypto_pcomp *tfm,
struct comp_request *req);

struct crypto_alg base;
};

extern struct crypto_pcomp *crypto_alloc_pcomp(const char *alg_name, u32 type,
u32 mask);

static inline struct crypto_tfm *crypto_pcomp_tfm(struct crypto_pcomp *tfm)
{
return &tfm->base;
}

static inline void crypto_free_pcomp(struct crypto_pcomp *tfm)
{
crypto_destroy_tfm(tfm, crypto_pcomp_tfm(tfm));
}

static inline struct pcomp_alg *__crypto_pcomp_alg(struct crypto_alg *alg)
{
return container_of(alg, struct pcomp_alg, base);
}

static inline struct pcomp_alg *crypto_pcomp_alg(struct crypto_pcomp *tfm)
{
return __crypto_pcomp_alg(crypto_pcomp_tfm(tfm)->__crt_alg);
}

static inline int crypto_compress_setup(struct crypto_pcomp *tfm,
void *params, unsigned int len)
{
return crypto_pcomp_alg(tfm)->compress_setup(tfm, params, len);
}

static inline int crypto_compress_init(struct crypto_pcomp *tfm)
{
return crypto_pcomp_alg(tfm)->compress_init(tfm);
}

static inline int crypto_compress_update(struct crypto_pcomp *tfm,
struct comp_request *req)
{
return crypto_pcomp_alg(tfm)->compress_update(tfm, req);
}

static inline int crypto_compress_final(struct crypto_pcomp *tfm,
struct comp_request *req)
{
return crypto_pcomp_alg(tfm)->compress_final(tfm, req);
}

static inline int crypto_decompress_setup(struct crypto_pcomp *tfm,
void *params, unsigned int len)
{
return crypto_pcomp_alg(tfm)->decompress_setup(tfm, params, len);
}

static inline int crypto_decompress_init(struct crypto_pcomp *tfm)
{
return crypto_pcomp_alg(tfm)->decompress_init(tfm);
}

static inline int crypto_decompress_update(struct crypto_pcomp *tfm,
struct comp_request *req)
{
return crypto_pcomp_alg(tfm)->decompress_update(tfm, req);
}

static inline int crypto_decompress_final(struct crypto_pcomp *tfm,
struct comp_request *req)
{
return crypto_pcomp_alg(tfm)->decompress_final(tfm, req);
}

#endif /* _CRYPTO_COMPRESS_H */