lib/gnutls_num.c

   1 /*
   2  * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 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 /* This file contains the functions needed for 64 bit integer support in
  26  * TLS, and functions which ease the access to TLS vectors (data of given size).
  27  */
  28
  29 #include <gnutls_int.h>
  30 #include <gnutls_num.h>
  31 #include <gnutls_errors.h>
  32
  33 /* This function will add one to uint64 x.
  34  * Returns 0 on success, or -1 if the uint64 max limit
  35  * has been reached.
  36  */
  37 int
  38 _gnutls_uint64pp (uint64 * x)
  39 {
  40   register int i, y = 0;
  41
  42   for (i = 7; i >= 0; i--)
  43     {
  44       y = 0;
  45       if (x->i[i] == 0xff)
  46         {
  47           x->i[i] = 0;
  48           y = 1;
  49         }
  50       else
  51         x->i[i]++;
  52
  53       if (y == 0)
  54         break;
  55     }
  56   if (y != 0)
  57     return -1;                  /* over 64 bits! WOW */
  58
  59   return 0;
  60 }
  61
  62 uint32_t
  63 _gnutls_uint24touint32 (uint24 num)
  64 {
  65   uint32_t ret = 0;
  66
  67   ((uint8_t *) & ret)[1] = num.pint[0];
  68   ((uint8_t *) & ret)[2] = num.pint[1];
  69   ((uint8_t *) & ret)[3] = num.pint[2];
  70   return ret;
  71 }
  72
  73 uint24
  74 _gnutls_uint32touint24 (uint32_t num)
  75 {
  76   uint24 ret;
  77
  78   ret.pint[0] = ((uint8_t *) & num)[1];
  79   ret.pint[1] = ((uint8_t *) & num)[2];
  80   ret.pint[2] = ((uint8_t *) & num)[3];
  81   return ret;
  82
  83 }
  84
  85 /* data should be at least 3 bytes */
  86 uint32_t
  87 _gnutls_read_uint24 (const opaque * data)
  88 {
  89   uint32_t res;
  90   uint24 num;
  91
  92   num.pint[0] = data[0];
  93   num.pint[1] = data[1];
  94   num.pint[2] = data[2];
  95
  96   res = _gnutls_uint24touint32 (num);
  97 #ifndef WORDS_BIGENDIAN
  98   res = byteswap32 (res);
  99 #endif
 100   return res;
 101 }
 102
 103 void
 104 _gnutls_write_uint24 (uint32_t num, opaque * data)
 105 {
 106   uint24 tmp;
 107
 108 #ifndef WORDS_BIGENDIAN
 109   num = byteswap32 (num);
 110 #endif
 111   tmp = _gnutls_uint32touint24 (num);
 112
 113   data[0] = tmp.pint[0];
 114   data[1] = tmp.pint[1];
 115   data[2] = tmp.pint[2];
 116 }
 117
 118 uint32_t
 119 _gnutls_read_uint32 (const opaque * data)
 120 {
 121   uint32_t res;
 122
 123   memcpy (&res, data, sizeof (uint32_t));
 124 #ifndef WORDS_BIGENDIAN
 125   res = byteswap32 (res);
 126 #endif
 127   return res;
 128 }
 129
 130 void
 131 _gnutls_write_uint32 (uint32_t num, opaque * data)
 132 {
 133
 134 #ifndef WORDS_BIGENDIAN
 135   num = byteswap32 (num);
 136 #endif
 137   memcpy (data, &num, sizeof (uint32_t));
 138 }
 139
 140 uint16_t
 141 _gnutls_read_uint16 (const opaque * data)
 142 {
 143   uint16_t res;
 144   memcpy (&res, data, sizeof (uint16_t));
 145 #ifndef WORDS_BIGENDIAN
 146   res = byteswap16 (res);
 147 #endif
 148   return res;
 149 }
 150
 151 void
 152 _gnutls_write_uint16 (uint16_t num, opaque * data)
 153 {
 154
 155 #ifndef WORDS_BIGENDIAN
 156   num = byteswap16 (num);
 157 #endif
 158   memcpy (data, &num, sizeof (uint16_t));
 159 }
 160
 161 uint32_t
 162 _gnutls_conv_uint32 (uint32_t data)
 163 {
 164 #ifndef WORDS_BIGENDIAN
 165   return byteswap32 (data);
 166 #else
 167   return data;
 168 #endif
 169 }
 170
 171 uint16_t
 172 _gnutls_conv_uint16 (uint16_t data)
 173 {
 174 #ifndef WORDS_BIGENDIAN
 175   return byteswap16 (data);
 176 #else
 177   return data;
 178 #endif
 179 }
 180
 181 uint32_t
 182 _gnutls_uint64touint32 (const uint64 * num)
 183 {
 184   uint32_t ret;
 185
 186   memcpy (&ret, &num->i[4], 4);
 187 #ifndef WORDS_BIGENDIAN
 188   ret = byteswap32 (ret);
 189 #endif
 190
 191   return ret;
 192 }