1 /* crypto/asn1/a_utf8.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
61 #include <openssl/asn1.h>
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).
76 int UTF8_getc(const unsigned char *str, int len, unsigned long *val)
78 const unsigned char *p;
85 /* Check syntax and work out the encoded value (if correct) */
86 if ((*p & 0x80) == 0) {
89 } else if ((*p & 0xe0) == 0xc0) {
92 if ((p[1] & 0xc0) != 0x80)
94 value = (*p++ & 0x1f) << 6;
99 } else if ((*p & 0xf0) == 0xe0) {
102 if (((p[1] & 0xc0) != 0x80)
103 || ((p[2] & 0xc0) != 0x80))
105 value = (*p++ & 0xf) << 12;
106 value |= (*p++ & 0x3f) << 6;
107 value |= *p++ & 0x3f;
111 } else if ((*p & 0xf8) == 0xf0) {
114 if (((p[1] & 0xc0) != 0x80)
115 || ((p[2] & 0xc0) != 0x80)
116 || ((p[3] & 0xc0) != 0x80))
118 value = ((unsigned long)(*p++ & 0x7)) << 18;
119 value |= (*p++ & 0x3f) << 12;
120 value |= (*p++ & 0x3f) << 6;
121 value |= *p++ & 0x3f;
125 } else if ((*p & 0xfc) == 0xf8) {
128 if (((p[1] & 0xc0) != 0x80)
129 || ((p[2] & 0xc0) != 0x80)
130 || ((p[3] & 0xc0) != 0x80)
131 || ((p[4] & 0xc0) != 0x80))
133 value = ((unsigned long)(*p++ & 0x3)) << 24;
134 value |= ((unsigned long)(*p++ & 0x3f)) << 18;
135 value |= ((unsigned long)(*p++ & 0x3f)) << 12;
136 value |= (*p++ & 0x3f) << 6;
137 value |= *p++ & 0x3f;
138 if (value < 0x200000)
141 } else if ((*p & 0xfe) == 0xfc) {
144 if (((p[1] & 0xc0) != 0x80)
145 || ((p[2] & 0xc0) != 0x80)
146 || ((p[3] & 0xc0) != 0x80)
147 || ((p[4] & 0xc0) != 0x80)
148 || ((p[5] & 0xc0) != 0x80))
150 value = ((unsigned long)(*p++ & 0x1)) << 30;
151 value |= ((unsigned long)(*p++ & 0x3f)) << 24;
152 value |= ((unsigned long)(*p++ & 0x3f)) << 18;
153 value |= ((unsigned long)(*p++ & 0x3f)) << 12;
154 value |= (*p++ & 0x3f) << 6;
155 value |= *p++ & 0x3f;
156 if (value < 0x4000000)
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
173 int UTF8_putc(unsigned char *str, int len, unsigned long value)
176 len = 6; /* Maximum we will need */
181 *str = (unsigned char)value;
188 *str++ = (unsigned char)(((value >> 6) & 0x1f) | 0xc0);
189 *str = (unsigned char)((value & 0x3f) | 0x80);
193 if (value < 0x10000) {
197 *str++ = (unsigned char)(((value >> 12) & 0xf) | 0xe0);
198 *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
199 *str = (unsigned char)((value & 0x3f) | 0x80);
203 if (value < 0x200000) {
207 *str++ = (unsigned char)(((value >> 18) & 0x7) | 0xf0);
208 *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
209 *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
210 *str = (unsigned char)((value & 0x3f) | 0x80);
214 if (value < 0x4000000) {
218 *str++ = (unsigned char)(((value >> 24) & 0x3) | 0xf8);
219 *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80);
220 *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
221 *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
222 *str = (unsigned char)((value & 0x3f) | 0x80);
229 *str++ = (unsigned char)(((value >> 30) & 0x1) | 0xfc);
230 *str++ = (unsigned char)(((value >> 24) & 0x3f) | 0x80);
231 *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80);
232 *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
233 *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
234 *str = (unsigned char)((value & 0x3f) | 0x80);