der_length.c revision 55682 
1/*
2 * Copyright (c) 1997, 1998, 1999 Kungliga Tekniska H�gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "der_locl.h"
35
36RCSID("$Id: der_length.c,v 1.10 1999/12/02 17:05:01 joda Exp $");
37
38static size_t
39length_unsigned (unsigned val)
40{
41  size_t ret = 0;
42
43  do {
44    ++ret;
45    val /= 256;
46  } while (val);
47  return ret;
48}
49
50static size_t
51length_int (int val)
52{
53  size_t ret = 0;
54
55  if (val == 0)
56    return 1;
57  while (val > 255 || val < -255) {
58    ++ret;
59    val /= 256;
60  }
61  if (val != 0) {
62    ++ret;
63    if ((signed char)val != val)
64      ++ret;
65    val /= 256;
66  }
67  return ret;
68}
69
70size_t
71length_len (size_t len)
72{
73  if (len < 128)
74    return 1;
75  else
76    return length_unsigned (len) + 1;
77}
78
79size_t
80length_integer (const int *data)
81{
82  size_t len = length_int (*data);
83
84  return 1 + length_len(len) + len;
85}
86
87size_t
88length_general_string (const general_string *data)
89{
90  char *str = *data;
91  size_t len = strlen(str);
92  return 1 + length_len(len) + len;
93}
94
95size_t
96length_octet_string (const octet_string *k)
97{
98  return 1 + length_len(k->length) + k->length;
99}
100
101size_t
102length_generalized_time (const time_t *t)
103{
104  octet_string k;
105  size_t ret;
106
107  time2generalizedtime (*t, &k);
108  ret = 1 + length_len(k.length) + k.length;
109  free (k.data);
110  return ret;
111}
112