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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
64/* UTF8 utilities */
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
76int 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 if(len <= 0) return 0;
82 p = str;
83
84 /* Check syntax and work out the encoded value (if correct) */
85 if((*p & 0x80) == 0) {
86 value = *p++ & 0x7f;
87 ret = 1;
88 } else if((*p & 0xe0) == 0xc0) {
89 if(len < 2) return -1;
90 if((p[1] & 0xc0) != 0x80) return -3;
91 value = (*p++ & 0x1f) << 6;
92 value |= *p++ & 0x3f;
93 if(value < 0x80) return -4;
94 ret = 2;
95 } else if((*p & 0xf0) == 0xe0) {
96 if(len < 3) return -1;
97 if( ((p[1] & 0xc0) != 0x80)
98 || ((p[2] & 0xc0) != 0x80) ) return -3;
99 value = (*p++ & 0xf) << 12;
100 value |= (*p++ & 0x3f) << 6;
101 value |= *p++ & 0x3f;
102 if(value < 0x800) return -4;
103 ret = 3;
104 } else if((*p & 0xf8) == 0xf0) {
105 if(len < 4) return -1;
106 if( ((p[1] & 0xc0) != 0x80)
107 || ((p[2] & 0xc0) != 0x80)
108 || ((p[3] & 0xc0) != 0x80) ) return -3;
109 value = ((unsigned long)(*p++ & 0x7)) << 18;
110 value |= (*p++ & 0x3f) << 12;
111 value |= (*p++ & 0x3f) << 6;
112 value |= *p++ & 0x3f;
113 if(value < 0x10000) return -4;
114 ret = 4;
115 } else if((*p & 0xfc) == 0xf8) {
116 if(len < 5) return -1;
117 if( ((p[1] & 0xc0) != 0x80)
118 || ((p[2] & 0xc0) != 0x80)
119 || ((p[3] & 0xc0) != 0x80)
120 || ((p[4] & 0xc0) != 0x80) ) return -3;
121 value = ((unsigned long)(*p++ & 0x3)) << 24;
122 value |= ((unsigned long)(*p++ & 0x3f)) << 18;
123 value |= ((unsigned long)(*p++ & 0x3f)) << 12;
124 value |= (*p++ & 0x3f) << 6;
125 value |= *p++ & 0x3f;
126 if(value < 0x200000) return -4;
127 ret = 5;
128 } else if((*p & 0xfe) == 0xfc) {
129 if(len < 6) return -1;
130 if( ((p[1] & 0xc0) != 0x80)
131 || ((p[2] & 0xc0) != 0x80)
132 || ((p[3] & 0xc0) != 0x80)
133 || ((p[4] & 0xc0) != 0x80)
134 || ((p[5] & 0xc0) != 0x80) ) return -3;
135 value = ((unsigned long)(*p++ & 0x1)) << 30;
136 value |= ((unsigned long)(*p++ & 0x3f)) << 24;
137 value |= ((unsigned long)(*p++ & 0x3f)) << 18;
138 value |= ((unsigned long)(*p++ & 0x3f)) << 12;
139 value |= (*p++ & 0x3f) << 6;
140 value |= *p++ & 0x3f;
141 if(value < 0x4000000) return -4;
142 ret = 6;
143 } else return -2;
144 *val = value;
145 return ret;
146}
147
148/* This takes a character 'value' and writes the UTF8 encoded value in
149 * 'str' where 'str' is a buffer containing 'len' characters. Returns
150 * the number of characters written or -1 if 'len' is too small. 'str' can
151 * be set to NULL in which case it just returns the number of characters.
152 * It will need at most 6 characters.
153 */
154
155int UTF8_putc(unsigned char *str, int len, unsigned long value)
156{
157 if(!str) len = 6; /* Maximum we will need */
158 else if(len <= 0) return -1;
159 if(value < 0x80) {
160 if(str) *str = (unsigned char)value;
161 return 1;
162 }
163 if(value < 0x800) {
164 if(len < 2) return -1;
165 if(str) {
166 *str++ = (unsigned char)(((value >> 6) & 0x1f) | 0xc0);
167 *str = (unsigned char)((value & 0x3f) | 0x80);
168 }
169 return 2;
170 }
171 if(value < 0x10000) {
172 if(len < 3) return -1;
173 if(str) {
174 *str++ = (unsigned char)(((value >> 12) & 0xf) | 0xe0);
175 *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
176 *str = (unsigned char)((value & 0x3f) | 0x80);
177 }
178 return 3;
179 }
180 if(value < 0x200000) {
181 if(len < 4) return -1;
182 if(str) {
183 *str++ = (unsigned char)(((value >> 18) & 0x7) | 0xf0);
184 *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
185 *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
186 *str = (unsigned char)((value & 0x3f) | 0x80);
187 }
188 return 4;
189 }
190 if(value < 0x4000000) {
191 if(len < 5) return -1;
192 if(str) {
193 *str++ = (unsigned char)(((value >> 24) & 0x3) | 0xf8);
194 *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80);
195 *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
196 *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
197 *str = (unsigned char)((value & 0x3f) | 0x80);
198 }
199 return 5;
200 }
201 if(len < 6) return -1;
202 if(str) {
203 *str++ = (unsigned char)(((value >> 30) & 0x1) | 0xfc);
204 *str++ = (unsigned char)(((value >> 24) & 0x3f) | 0x80);
205 *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80);
206 *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
207 *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
208 *str = (unsigned char)((value & 0x3f) | 0x80);
209 }
210 return 6;
211}
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