lib/gnutls_datum.c

   1 /*
   2  * Copyright (C) 2001-2012 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
  23 /* contains functions that make it easier to
  24  * write vectors of <size|data>. The destination size
  25  * should be preallocated (datum.size+(bits/8))
  26  */
  27
  28 #include <gnutls_int.h>
  29 #include <gnutls_num.h>
  30 #include <gnutls_datum.h>
  31 #include <gnutls_errors.h>
  32
  33 int
  34 _gnutls_set_datum (gnutls_datum_t * dat, const void *data,
  35                      size_t data_size)
  36 {
  37   if (data_size == 0 || data == NULL)
  38     {
  39       dat->data = NULL;
  40       dat->size = 0;
  41       return 0;
  42     }
  43
  44   dat->data = gnutls_malloc (data_size);
  45   if (dat->data == NULL)
  46     return GNUTLS_E_MEMORY_ERROR;
  47
  48   dat->size = data_size;
  49   memcpy (dat->data, data, data_size);
  50
  51   return 0;
  52 }
  53
  54 int
  55 _gnutls_datum_append (gnutls_datum_t * dst, const void *data,
  56                         size_t data_size)
  57 {
  58
  59   dst->data = gnutls_realloc (dst->data, data_size + dst->size);
  60   if (dst->data == NULL)
  61     return GNUTLS_E_MEMORY_ERROR;
  62
  63   memcpy (&dst->data[dst->size], data, data_size);
  64   dst->size += data_size;
  65
  66   return 0;
  67 }
  68
  69 void
  70 _gnutls_free_datum (gnutls_datum_t * dat)
  71 {
  72   if (dat->data != NULL)
  73     gnutls_free (dat->data);
  74
  75   dat->data = NULL;
  76   dat->size = 0;
  77 }