summaryrefslogtreecommitdiff
path: root/lib/gnutls_num.c
blob: a316c3c6d9c96c17e108e6a494395e483d60799e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
/*
 * Copyright (C) 2000-2005, 2008, 2010, 2012 Free Software Foundation,
 * Inc.
 *
 * Author: Nikos Mavrogiannopoulos
 *
 * This file is part of GnuTLS.
 *
 * The GnuTLS is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

/* This file contains the functions needed for 64 bit integer support in
 * TLS, and functions which ease the access to TLS vectors (data of given size).
 */

#include <gnutls_int.h>
#include <gnutls_num.h>
#include <gnutls_errors.h>

#include <byteswap.h>

/* This function will add one to uint64 x.
 * Returns 0 on success, or -1 if the uint64 max limit
 * has been reached.
 */
int
_gnutls_uint64pp (uint64 * x)
{
  register int i, y = 0;

  for (i = 7; i >= 0; i--)
    {
      y = 0;
      if (x->i[i] == 0xff)
        {
          x->i[i] = 0;
          y = 1;
        }
      else
        x->i[i]++;

      if (y == 0)
        break;
    }
  if (y != 0)
    return -1;                  /* over 64 bits! WOW */

  return 0;
}

/* This function will add one to uint48 x.
 * Returns 0 on success, or -1 if the uint48 max limit
 * has been reached.
 */
int
_gnutls_uint48pp (uint64 * x)
{
  register int i, y = 0;

  for (i = 7; i >= 3; i--)
    {
      y = 0;
      if (x->i[i] == 0xff)
        {
          x->i[i] = 0;
          y = 1;
        }
      else
        x->i[i]++;

      if (y == 0)
        break;
    }
  if (y != 0)
    return -1;                  /* over 48 bits */

  return 0;
}

uint32_t
_gnutls_uint24touint32 (uint24 num)
{
  uint32_t ret = 0;

  ((uint8_t *) & ret)[1] = num.pint[0];
  ((uint8_t *) & ret)[2] = num.pint[1];
  ((uint8_t *) & ret)[3] = num.pint[2];
  return ret;
}

uint24
_gnutls_uint32touint24 (uint32_t num)
{
  uint24 ret;

  ret.pint[0] = ((uint8_t *) & num)[1];
  ret.pint[1] = ((uint8_t *) & num)[2];
  ret.pint[2] = ((uint8_t *) & num)[3];
  return ret;

}

/* data should be at least 3 bytes */
uint32_t
_gnutls_read_uint24 (const opaque * data)
{
  uint32_t res;
  uint24 num;

  num.pint[0] = data[0];
  num.pint[1] = data[1];
  num.pint[2] = data[2];

  res = _gnutls_uint24touint32 (num);
#ifndef WORDS_BIGENDIAN
  res = bswap_32 (res);
#endif
  return res;
}

void
_gnutls_write_uint64 (uint64_t num, opaque * data)
{
#ifndef WORDS_BIGENDIAN
  num = bswap_64 (num);
#endif
  memcpy(data, &num, 8);
}

void
_gnutls_write_uint24 (uint32_t num, opaque * data)
{
  uint24 tmp;

#ifndef WORDS_BIGENDIAN
  num = bswap_32 (num);
#endif
  tmp = _gnutls_uint32touint24 (num);

  data[0] = tmp.pint[0];
  data[1] = tmp.pint[1];
  data[2] = tmp.pint[2];
}

uint32_t
_gnutls_read_uint32 (const opaque * data)
{
  uint32_t res;

  memcpy (&res, data, sizeof (uint32_t));
#ifndef WORDS_BIGENDIAN
  res = bswap_32 (res);
#endif
  return res;
}

void
_gnutls_write_uint32 (uint32_t num, opaque * data)
{

#ifndef WORDS_BIGENDIAN
  num = bswap_32 (num);
#endif
  memcpy (data, &num, sizeof (uint32_t));
}

uint16_t
_gnutls_read_uint16 (const opaque * data)
{
  uint16_t res;
  memcpy (&res, data, sizeof (uint16_t));
#ifndef WORDS_BIGENDIAN
  res = bswap_16 (res);
#endif
  return res;
}

void
_gnutls_write_uint16 (uint16_t num, opaque * data)
{

#ifndef WORDS_BIGENDIAN
  num = bswap_16 (num);
#endif
  memcpy (data, &num, sizeof (uint16_t));
}

uint32_t
_gnutls_conv_uint32 (uint32_t data)
{
#ifndef WORDS_BIGENDIAN
  return bswap_32 (data);
#else
  return data;
#endif
}

uint16_t
_gnutls_conv_uint16 (uint16_t data)
{
#ifndef WORDS_BIGENDIAN
  return bswap_16 (data);
#else
  return data;
#endif
}

uint32_t
_gnutls_uint64touint32 (const uint64 * num)
{
  uint32_t ret;

  memcpy (&ret, &num->i[4], 4);
#ifndef WORDS_BIGENDIAN
  ret = bswap_32 (ret);
#endif

  return ret;
}