lib/gnutls_datum.c

   1 /*
   2  * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2010 Free Software
   3  * 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
  26 /* contains functions that make it easier to
  27  * write vectors of <size|data>. The destination size
  28  * should be preallocated (datum.size+(bits/8))
  29  */
  30
  31 #include <gnutls_int.h>
  32 #include <gnutls_num.h>
  33 #include <gnutls_datum.h>
  34 #include <gnutls_errors.h>
  35
  36
  37 void
  38 _gnutls_write_datum16 (opaque * dest, gnutls_datum_t dat)
  39 {
  40   _gnutls_write_uint16 (dat.size, dest);
  41   if (dat.data != NULL)
  42     memcpy (&dest[2], dat.data, dat.size);
  43 }
  44
  45 void
  46 _gnutls_write_datum24 (opaque * dest, gnutls_datum_t dat)
  47 {
  48   _gnutls_write_uint24 (dat.size, dest);
  49   if (dat.data != NULL)
  50     memcpy (&dest[3], dat.data, dat.size);
  51 }
  52
  53 void
  54 _gnutls_write_datum32 (opaque * dest, gnutls_datum_t dat)
  55 {
  56   _gnutls_write_uint32 (dat.size, dest);
  57   if (dat.data != NULL)
  58     memcpy (&dest[4], dat.data, dat.size);
  59 }
  60
  61 void
  62 _gnutls_write_datum8 (opaque * dest, gnutls_datum_t dat)
  63 {
  64   dest[0] = (uint8_t) dat.size;
  65   if (dat.data != NULL)
  66     memcpy (&dest[1], dat.data, dat.size);
  67 }
  68
  69
  70 int
  71 _gnutls_set_datum_m (gnutls_datum_t * dat, const void *data,
  72                      size_t data_size, gnutls_alloc_function galloc_func)
  73 {
  74   if (data_size == 0 || data == NULL)
  75     {
  76       dat->data = NULL;
  77       dat->size = 0;
  78       return 0;
  79     }
  80
  81   dat->data = galloc_func (data_size);
  82   if (dat->data == NULL)
  83     return GNUTLS_E_MEMORY_ERROR;
  84
  85   dat->size = data_size;
  86   memcpy (dat->data, data, data_size);
  87
  88   return 0;
  89 }
  90
  91 int
  92 _gnutls_datum_append_m (gnutls_datum_t * dst, const void *data,
  93                         size_t data_size,
  94                         gnutls_realloc_function grealloc_func)
  95 {
  96
  97   dst->data = grealloc_func (dst->data, data_size + dst->size);
  98   if (dst->data == NULL)
  99     return GNUTLS_E_MEMORY_ERROR;
 100
 101   memcpy (&dst->data[dst->size], data, data_size);
 102   dst->size += data_size;
 103
 104   return 0;
 105 }
 106
 107 void
 108 _gnutls_free_datum_m (gnutls_datum_t * dat, gnutls_free_function gfree_func)
 109 {
 110   if (dat->data != NULL)
 111     gfree_func (dat->data);
 112
 113   dat->data = NULL;
 114   dat->size = 0;
 115 }