Line data Source code
1 : /* crypto/asn1/a_utf8.c */
2 : /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 : * All rights reserved.
4 : *
5 : * This package is an SSL implementation written
6 : * by Eric Young (eay@cryptsoft.com).
7 : * The implementation was written so as to conform with Netscapes SSL.
8 : *
9 : * This library is free for commercial and non-commercial use as long as
10 : * the following conditions are aheared to. The following conditions
11 : * apply to all code found in this distribution, be it the RC4, RSA,
12 : * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 : * included with this distribution is covered by the same copyright terms
14 : * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 : *
16 : * Copyright remains Eric Young's, and as such any Copyright notices in
17 : * the code are not to be removed.
18 : * If this package is used in a product, Eric Young should be given attribution
19 : * as the author of the parts of the library used.
20 : * This can be in the form of a textual message at program startup or
21 : * in documentation (online or textual) provided with the package.
22 : *
23 : * Redistribution and use in source and binary forms, with or without
24 : * modification, are permitted provided that the following conditions
25 : * are met:
26 : * 1. Redistributions of source code must retain the copyright
27 : * notice, this list of conditions and the following disclaimer.
28 : * 2. Redistributions in binary form must reproduce the above copyright
29 : * notice, this list of conditions and the following disclaimer in the
30 : * documentation and/or other materials provided with the distribution.
31 : * 3. All advertising materials mentioning features or use of this software
32 : * must display the following acknowledgement:
33 : * "This product includes cryptographic software written by
34 : * Eric Young (eay@cryptsoft.com)"
35 : * The word 'cryptographic' can be left out if the rouines from the library
36 : * being used are not cryptographic related :-).
37 : * 4. If you include any Windows specific code (or a derivative thereof) from
38 : * the apps directory (application code) you must include an acknowledgement:
39 : * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 : *
41 : * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 : * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 : * SUCH DAMAGE.
52 : *
53 : * The licence and distribution terms for any publically available version or
54 : * derivative of this code cannot be changed. i.e. this code cannot simply be
55 : * copied and put under another distribution licence
56 : * [including the GNU Public Licence.]
57 : */
58 :
59 : #include <stdio.h>
60 : #include "cryptlib.h"
61 : #include <openssl/asn1.h>
62 :
63 : /* UTF8 utilities */
64 :
65 : /*-
66 : * This parses a UTF8 string one character at a time. It is passed a pointer
67 : * to the string and the length of the string. It sets 'value' to the value of
68 : * the current character. It returns the number of characters read or a
69 : * negative error code:
70 : * -1 = string too short
71 : * -2 = illegal character
72 : * -3 = subsequent characters not of the form 10xxxxxx
73 : * -4 = character encoded incorrectly (not minimal length).
74 : */
75 :
76 169256 : int UTF8_getc(const unsigned char *str, int len, unsigned long *val)
77 : {
78 : const unsigned char *p;
79 : unsigned long value;
80 : int ret;
81 169256 : if (len <= 0)
82 : return 0;
83 : p = str;
84 :
85 : /* Check syntax and work out the encoded value (if correct) */
86 169256 : if ((*p & 0x80) == 0) {
87 169256 : value = *p++ & 0x7f;
88 : ret = 1;
89 0 : } else if ((*p & 0xe0) == 0xc0) {
90 0 : if (len < 2)
91 : return -1;
92 0 : if ((p[1] & 0xc0) != 0x80)
93 : return -3;
94 0 : value = (*p++ & 0x1f) << 6;
95 0 : value |= *p++ & 0x3f;
96 0 : if (value < 0x80)
97 : return -4;
98 : ret = 2;
99 0 : } else if ((*p & 0xf0) == 0xe0) {
100 0 : if (len < 3)
101 : return -1;
102 0 : if (((p[1] & 0xc0) != 0x80)
103 0 : || ((p[2] & 0xc0) != 0x80))
104 : return -3;
105 0 : value = (*p++ & 0xf) << 12;
106 0 : value |= (*p++ & 0x3f) << 6;
107 0 : value |= *p++ & 0x3f;
108 0 : if (value < 0x800)
109 : return -4;
110 : ret = 3;
111 0 : } else if ((*p & 0xf8) == 0xf0) {
112 0 : if (len < 4)
113 : return -1;
114 0 : if (((p[1] & 0xc0) != 0x80)
115 0 : || ((p[2] & 0xc0) != 0x80)
116 0 : || ((p[3] & 0xc0) != 0x80))
117 : return -3;
118 0 : value = ((unsigned long)(*p++ & 0x7)) << 18;
119 0 : value |= (*p++ & 0x3f) << 12;
120 0 : value |= (*p++ & 0x3f) << 6;
121 0 : value |= *p++ & 0x3f;
122 0 : if (value < 0x10000)
123 : return -4;
124 : ret = 4;
125 0 : } else if ((*p & 0xfc) == 0xf8) {
126 0 : if (len < 5)
127 : return -1;
128 0 : if (((p[1] & 0xc0) != 0x80)
129 0 : || ((p[2] & 0xc0) != 0x80)
130 0 : || ((p[3] & 0xc0) != 0x80)
131 0 : || ((p[4] & 0xc0) != 0x80))
132 : return -3;
133 0 : value = ((unsigned long)(*p++ & 0x3)) << 24;
134 0 : value |= ((unsigned long)(*p++ & 0x3f)) << 18;
135 0 : value |= ((unsigned long)(*p++ & 0x3f)) << 12;
136 0 : value |= (*p++ & 0x3f) << 6;
137 0 : value |= *p++ & 0x3f;
138 0 : if (value < 0x200000)
139 : return -4;
140 : ret = 5;
141 0 : } else if ((*p & 0xfe) == 0xfc) {
142 0 : if (len < 6)
143 : return -1;
144 0 : if (((p[1] & 0xc0) != 0x80)
145 0 : || ((p[2] & 0xc0) != 0x80)
146 0 : || ((p[3] & 0xc0) != 0x80)
147 0 : || ((p[4] & 0xc0) != 0x80)
148 0 : || ((p[5] & 0xc0) != 0x80))
149 : return -3;
150 0 : value = ((unsigned long)(*p++ & 0x1)) << 30;
151 0 : value |= ((unsigned long)(*p++ & 0x3f)) << 24;
152 0 : value |= ((unsigned long)(*p++ & 0x3f)) << 18;
153 0 : value |= ((unsigned long)(*p++ & 0x3f)) << 12;
154 0 : value |= (*p++ & 0x3f) << 6;
155 0 : value |= *p++ & 0x3f;
156 0 : if (value < 0x4000000)
157 : return -4;
158 : ret = 6;
159 : } else
160 : return -2;
161 169256 : *val = value;
162 169256 : return ret;
163 : }
164 :
165 : /*
166 : * This takes a character 'value' and writes the UTF8 encoded value in 'str'
167 : * where 'str' is a buffer containing 'len' characters. Returns the number of
168 : * characters written or -1 if 'len' is too small. 'str' can be set to NULL
169 : * in which case it just returns the number of characters. It will need at
170 : * most 6 characters.
171 : */
172 :
173 241054 : int UTF8_putc(unsigned char *str, int len, unsigned long value)
174 : {
175 241054 : if (!str)
176 : len = 6; /* Maximum we will need */
177 120527 : else if (len <= 0)
178 : return -1;
179 241054 : if (value < 0x80) {
180 241054 : if (str)
181 120527 : *str = (unsigned char)value;
182 : return 1;
183 : }
184 0 : if (value < 0x800) {
185 0 : if (len < 2)
186 : return -1;
187 0 : if (str) {
188 0 : *str++ = (unsigned char)(((value >> 6) & 0x1f) | 0xc0);
189 0 : *str = (unsigned char)((value & 0x3f) | 0x80);
190 : }
191 : return 2;
192 : }
193 0 : if (value < 0x10000) {
194 0 : if (len < 3)
195 : return -1;
196 0 : if (str) {
197 0 : *str++ = (unsigned char)(((value >> 12) & 0xf) | 0xe0);
198 0 : *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
199 0 : *str = (unsigned char)((value & 0x3f) | 0x80);
200 : }
201 : return 3;
202 : }
203 0 : if (value < 0x200000) {
204 0 : if (len < 4)
205 : return -1;
206 0 : if (str) {
207 0 : *str++ = (unsigned char)(((value >> 18) & 0x7) | 0xf0);
208 0 : *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
209 0 : *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
210 0 : *str = (unsigned char)((value & 0x3f) | 0x80);
211 : }
212 : return 4;
213 : }
214 0 : if (value < 0x4000000) {
215 0 : if (len < 5)
216 : return -1;
217 0 : if (str) {
218 0 : *str++ = (unsigned char)(((value >> 24) & 0x3) | 0xf8);
219 0 : *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80);
220 0 : *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
221 0 : *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
222 0 : *str = (unsigned char)((value & 0x3f) | 0x80);
223 : }
224 : return 5;
225 : }
226 0 : if (len < 6)
227 : return -1;
228 0 : if (str) {
229 0 : *str++ = (unsigned char)(((value >> 30) & 0x1) | 0xfc);
230 0 : *str++ = (unsigned char)(((value >> 24) & 0x3f) | 0x80);
231 0 : *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80);
232 0 : *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
233 0 : *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
234 0 : *str = (unsigned char)((value & 0x3f) | 0x80);
235 : }
236 : return 6;
237 : }
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