lib/gnutls_compress.h

   1 /*
   2  * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2010 Free
   3  * Software Foundation, Inc.
   4  *
   5  * Author: Nikos Mavrogiannopoulos
   6  *
   7  * This file is part of GnuTLS.
   8  *
   9  * The GnuTLS is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public License
  11  * as published by the Free Software Foundation; either version 2.1 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  22  * USA
  23  *
  24  */
  25 #ifndef GNUTLS_COMPRESS_H
  26 #define GNUTLS_COMPRESS_H
  27
  28 int _gnutls_m_plaintext2compressed (gnutls_session_t session,
  29                                     gnutls_datum_t * compressed,
  30                                     const gnutls_datum_t * plaintext,
  31                                     const record_parameters_st * params);
  32 int _gnutls_m_compressed2plaintext (gnutls_session_t session,
  33                                     gnutls_datum_t * plain,
  34                                     const gnutls_datum_t * compressed,
  35                                     const record_parameters_st * params);
  36
  37 /* Algorithm handling. */
  38 int _gnutls_supported_compression_methods (gnutls_session_t session,
  39                                            uint8_t ** comp);
  40 int _gnutls_compression_is_ok (gnutls_compression_method_t algorithm);
  41 int _gnutls_compression_get_num (gnutls_compression_method_t algorithm);
  42 gnutls_compression_method_t _gnutls_compression_get_id (int num);
  43
  44 #ifdef HAVE_LIBZ
  45 #include <zlib.h>
  46 #endif
  47
  48 #define GNUTLS_COMP_FAILED NULL
  49
  50 typedef struct comp_hd_t_STRUCT
  51 {
  52   void *handle;
  53   gnutls_compression_method_t algo;
  54 } *comp_hd_t;
  55
  56 comp_hd_t _gnutls_comp_init (gnutls_compression_method_t, int d);
  57 void _gnutls_comp_deinit (comp_hd_t handle, int d);
  58
  59 int _gnutls_decompress (comp_hd_t handle, opaque * compressed,
  60                         size_t compressed_size, opaque ** plain,
  61                         size_t max_record_size);
  62 int _gnutls_compress (comp_hd_t, const opaque * plain, size_t plain_size,
  63                       opaque ** compressed, size_t max_comp_size);
  64
  65 struct gnutls_compression_entry
  66 {
  67   const char *name;
  68   gnutls_compression_method_t id;
  69   /* the number reserved in TLS for the specific compression method */
  70   int num;
  71
  72   /* used in zlib compressor */
  73   int window_bits;
  74   int mem_level;
  75   int comp_level;
  76 };
  77 typedef struct gnutls_compression_entry gnutls_compression_entry;
  78
  79 #endif