lib/gnutls_compress.h

   1 /*
   2  * Copyright (C) 2000-2012 Free Software Foundation, Inc.
   3  *
   4  * Author: Nikos Mavrogiannopoulos
   5  *
   6  * This file is part of GnuTLS.
   7  *
   8  * The GnuTLS is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public License
  10  * as published by the Free Software Foundation; either version 3 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>
  20  *
  21  */
  22 #ifndef GNUTLS_COMPRESS_H
  23 #define GNUTLS_COMPRESS_H
  24
  25 /* Algorithm handling. */
  26 int _gnutls_supported_compression_methods (gnutls_session_t session,
  27                                            uint8_t * comp, size_t max_comp);
  28 int _gnutls_compression_is_ok (gnutls_compression_method_t algorithm);
  29 int _gnutls_compression_get_num (gnutls_compression_method_t algorithm);
  30 gnutls_compression_method_t _gnutls_compression_get_id (int num);
  31
  32 #ifdef HAVE_LIBZ
  33 #include <zlib.h>
  34 #endif
  35
  36 #define GNUTLS_COMP_FAILED NULL
  37
  38 typedef struct comp_hd_st
  39 {
  40   void *handle;
  41   gnutls_compression_method_t algo;
  42 } comp_hd_st;
  43
  44 int _gnutls_comp_init (comp_hd_st*, gnutls_compression_method_t, int d);
  45 void _gnutls_comp_deinit (comp_hd_st* handle, int d);
  46
  47 int _gnutls_decompress (comp_hd_st* handle, uint8_t * compressed,
  48                         size_t compressed_size, uint8_t * plain,
  49                         size_t max_plain_size);
  50 int _gnutls_compress (comp_hd_st*, const uint8_t * plain, size_t plain_size,
  51                       uint8_t * compressed, size_t max_comp_size, unsigned int stateless);
  52
  53 struct gnutls_compression_entry
  54 {
  55   const char *name;
  56   gnutls_compression_method_t id;
  57   /* the number reserved in TLS for the specific compression method */
  58   int num;
  59
  60   /* used in zlib compressor */
  61   int window_bits;
  62   int mem_level;
  63   int comp_level;
  64 };
  65 typedef struct gnutls_compression_entry gnutls_compression_entry;
  66
  67 #endif