lib/gnutls_num.c

   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
  26 /* This file contains the functions needed for 64 bit integer support in
  27  * TLS, and functions which ease the access to TLS vectors (data of given size).
  28  */
  29
  30 #include <gnutls_int.h>
  31 #include <gnutls_num.h>
  32 #include <gnutls_errors.h>
  33
  34 #include <byteswap.h>
  35
  36 /* This function will add one to uint64 x.
  37  * Returns 0 on success, or -1 if the uint64 max limit
  38  * has been reached.
  39  */
  40 int
  41 _gnutls_uint64pp (uint64 * x)
  42 {
  43   register int i, y = 0;
  44
  45   for (i = 7; i >= 0; i--)
  46     {
  47       y = 0;
  48       if (x->i[i] == 0xff)
  49         {
  50           x->i[i] = 0;
  51           y = 1;
  52         }
  53       else
  54         x->i[i]++;
  55
  56       if (y == 0)
  57         break;
  58     }
  59   if (y != 0)
  60     return -1;                  /* over 64 bits! WOW */
  61
  62   return 0;
  63 }
  64
  65 uint32_t
  66 _gnutls_uint24touint32 (uint24 num)
  67 {
  68   uint32_t ret = 0;
  69
  70   ((uint8_t *) & ret)[1] = num.pint[0];
  71   ((uint8_t *) & ret)[2] = num.pint[1];
  72   ((uint8_t *) & ret)[3] = num.pint[2];
  73   return ret;
  74 }
  75
  76 uint24
  77 _gnutls_uint32touint24 (uint32_t num)
  78 {
  79   uint24 ret;
  80
  81   ret.pint[0] = ((uint8_t *) & num)[1];
  82   ret.pint[1] = ((uint8_t *) & num)[2];
  83   ret.pint[2] = ((uint8_t *) & num)[3];
  84   return ret;
  85
  86 }
  87
  88 /* data should be at least 3 bytes */
  89 uint32_t
  90 _gnutls_read_uint24 (const opaque * data)
  91 {
  92   uint32_t res;
  93   uint24 num;
  94
  95   num.pint[0] = data[0];
  96   num.pint[1] = data[1];
  97   num.pint[2] = data[2];
  98
  99   res = _gnutls_uint24touint32 (num);
 100 #ifndef WORDS_BIGENDIAN
 101   res = bswap_32 (res);
 102 #endif
 103   return res;
 104 }
 105
 106 void
 107 _gnutls_write_uint24 (uint32_t num, opaque * data)
 108 {
 109   uint24 tmp;
 110
 111 #ifndef WORDS_BIGENDIAN
 112   num = bswap_32 (num);
 113 #endif
 114   tmp = _gnutls_uint32touint24 (num);
 115
 116   data[0] = tmp.pint[0];
 117   data[1] = tmp.pint[1];
 118   data[2] = tmp.pint[2];
 119 }
 120
 121 uint32_t
 122 _gnutls_read_uint32 (const opaque * data)
 123 {
 124   uint32_t res;
 125
 126   memcpy (&res, data, sizeof (uint32_t));
 127 #ifndef WORDS_BIGENDIAN
 128   res = bswap_32 (res);
 129 #endif
 130   return res;
 131 }
 132
 133 void
 134 _gnutls_write_uint32 (uint32_t num, opaque * data)
 135 {
 136
 137 #ifndef WORDS_BIGENDIAN
 138   num = bswap_32 (num);
 139 #endif
 140   memcpy (data, &num, sizeof (uint32_t));
 141 }
 142
 143 uint16_t
 144 _gnutls_read_uint16 (const opaque * data)
 145 {
 146   uint16_t res;
 147   memcpy (&res, data, sizeof (uint16_t));
 148 #ifndef WORDS_BIGENDIAN
 149   res = bswap_16 (res);
 150 #endif
 151   return res;
 152 }
 153
 154 void
 155 _gnutls_write_uint16 (uint16_t num, opaque * data)
 156 {
 157
 158 #ifndef WORDS_BIGENDIAN
 159   num = bswap_16 (num);
 160 #endif
 161   memcpy (data, &num, sizeof (uint16_t));
 162 }
 163
 164 uint32_t
 165 _gnutls_conv_uint32 (uint32_t data)
 166 {
 167 #ifndef WORDS_BIGENDIAN
 168   return bswap_32 (data);
 169 #else
 170   return data;
 171 #endif
 172 }
 173
 174 uint16_t
 175 _gnutls_conv_uint16 (uint16_t data)
 176 {
 177 #ifndef WORDS_BIGENDIAN
 178   return bswap_16 (data);
 179 #else
 180   return data;
 181 #endif
 182 }
 183
 184 uint32_t
 185 _gnutls_uint64touint32 (const uint64 * num)
 186 {
 187   uint32_t ret;
 188
 189   memcpy (&ret, &num->i[4], 4);
 190 #ifndef WORDS_BIGENDIAN
 191   ret = bswap_32 (ret);
 192 #endif
 193
 194   return ret;
 195 }