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kernel/linux-imx6_3.14.28/include/crypto/compress.h 4.01 KB
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  /*
   * 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 */