lib/gnutls_datum.c

   1 /*
   2  * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007 Free Software Foundation
   3  *
   4  * Author: Nikos Mavrogiannopoulos
   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 /* contains functions that make it easier to
  26  * write vectors of <size|data>. The destination size
  27  * should be preallocated (datum.size+(bits/8))
  28  */
  29
  30 #include <gnutls_int.h>
  31 #include <gnutls_num.h>
  32 #include <gnutls_datum.h>
  33 #include <gnutls_errors.h>
  34
  35
  36 void
  37 _gnutls_write_datum16 (opaque * dest, gnutls_datum_t dat)
  38 {
  39   _gnutls_write_uint16 (dat.size, dest);
  40   if (dat.data != NULL)
  41     memcpy (&dest[2], dat.data, dat.size);
  42 }
  43
  44 void
  45 _gnutls_write_datum24 (opaque * dest, gnutls_datum_t dat)
  46 {
  47   _gnutls_write_uint24 (dat.size, dest);
  48   if (dat.data != NULL)
  49     memcpy (&dest[3], dat.data, dat.size);
  50 }
  51
  52 void
  53 _gnutls_write_datum32 (opaque * dest, gnutls_datum_t dat)
  54 {
  55   _gnutls_write_uint32 (dat.size, dest);
  56   if (dat.data != NULL)
  57     memcpy (&dest[4], dat.data, dat.size);
  58 }
  59
  60 void
  61 _gnutls_write_datum8 (opaque * dest, gnutls_datum_t dat)
  62 {
  63   dest[0] = (uint8_t) dat.size;
  64   if (dat.data != NULL)
  65     memcpy (&dest[1], dat.data, dat.size);
  66 }
  67
  68
  69 int
  70 _gnutls_set_datum_m (gnutls_datum_t * dat, const void *data,
  71                      size_t data_size, gnutls_alloc_function galloc_func)
  72 {
  73   if (data_size == 0 || data == NULL)
  74     {
  75       dat->data = NULL;
  76       dat->size = 0;
  77       return 0;
  78     }
  79
  80   dat->data = galloc_func (data_size);
  81   if (dat->data == NULL)
  82     return GNUTLS_E_MEMORY_ERROR;
  83
  84   dat->size = data_size;
  85   memcpy (dat->data, data, data_size);
  86
  87   return 0;
  88 }
  89
  90 int
  91 _gnutls_datum_append_m (gnutls_datum_t * dst, const void *data,
  92                         size_t data_size,
  93                         gnutls_realloc_function grealloc_func)
  94 {
  95
  96   dst->data = grealloc_func (dst->data, data_size + dst->size);
  97   if (dst->data == NULL)
  98     return GNUTLS_E_MEMORY_ERROR;
  99
 100   memcpy (&dst->data[dst->size], data, data_size);
 101   dst->size += data_size;
 102
 103   return 0;
 104 }
 105
 106 void
 107 _gnutls_free_datum_m (gnutls_datum_t * dat, gnutls_free_function gfree_func)
 108 {
 109   if (dat->data != NULL)
 110     gfree_func (dat->data);
 111
 112   dat->data = NULL;
 113   dat->size = 0;
 114 }