lib/gnutls_compress.c

   1 /*
   2  * Copyright (C) 2000, 2004, 2005 Free Software Foundation
   3  *
   4  * Author: Nikos Mavroyanopoulos
   5  *
   6  * This file is part of GNUTLS.
   7  *
   8  * The GNUTLS library 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 2.1 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
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  21  * USA
  22  *
  23  */
  24
  25 /* This file contains the functions which convert the TLS plaintext
  26  * packet to TLS compressed packet.
  27  */
  28
  29 #include "gnutls_int.h"
  30 #include "gnutls_compress.h"
  31 #include "gnutls_errors.h"
  32 #include "gnutls_compress_int.h"
  33
  34 /* These functions allocate the return value internally
  35  */
  36 int
  37 _gnutls_m_plaintext2compressed (gnutls_session_t session,
  38                                 gnutls_datum_t * compressed,
  39                                 gnutls_datum_t plaintext)
  40 {
  41   int size;
  42   opaque *data;
  43
  44   size =
  45     _gnutls_compress (session->connection_state.write_compression_state,
  46                       plaintext.data, plaintext.size, &data,
  47                       MAX_RECORD_SEND_SIZE + 1024);
  48   if (size < 0)
  49     {
  50       gnutls_assert ();
  51       return GNUTLS_E_COMPRESSION_FAILED;
  52     }
  53   compressed->data = data;
  54   compressed->size = size;
  55
  56   return 0;
  57 }
  58
  59 int
  60 _gnutls_m_compressed2plaintext (gnutls_session_t session,
  61                                 gnutls_datum_t * plain,
  62                                 gnutls_datum_t compressed)
  63 {
  64   int size;
  65   opaque *data;
  66
  67   size =
  68     _gnutls_decompress (session->connection_state.
  69                         read_compression_state, compressed.data,
  70                         compressed.size, &data, MAX_RECORD_RECV_SIZE);
  71   if (size < 0)
  72     {
  73       gnutls_assert ();
  74       return GNUTLS_E_DECOMPRESSION_FAILED;
  75     }
  76   plain->data = data;
  77   plain->size = size;
  78
  79   return 0;
  80 }