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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/asn1/a_utf8.c
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>
67 * This parses a UTF8 string one character at a time. It is passed a pointer
68 * to the string and the length of the string. It sets 'value' to the value of
69 * the current character. It returns the number of characters read or a
70 * negative error code:
71 * -1 = string too short
72 * -2 = illegal character
73 * -3 = subsequent characters not of the form 10xxxxxx
74 * -4 = character encoded incorrectly (not minimal length).
77 int UTF8_getc(const unsigned char *str
, int len
, unsigned long *val
)
79 const unsigned char *p
;
82 if(len
<= 0) return 0;
85 /* Check syntax and work out the encoded value (if correct) */
86 if((*p
& 0x80) == 0) {
89 } else if((*p
& 0xe0) == 0xc0) {
90 if(len
< 2) return -1;
91 if((p
[1] & 0xc0) != 0x80) return -3;
92 value
= (*p
++ & 0x1f) << 6;
94 if(value
< 0x80) return -4;
96 } else if((*p
& 0xf0) == 0xe0) {
97 if(len
< 3) return -1;
98 if( ((p
[1] & 0xc0) != 0x80)
99 || ((p
[2] & 0xc0) != 0x80) ) return -3;
100 value
= (*p
++ & 0xf) << 12;
101 value
|= (*p
++ & 0x3f) << 6;
102 value
|= *p
++ & 0x3f;
103 if(value
< 0x800) return -4;
105 } else if((*p
& 0xf8) == 0xf0) {
106 if(len
< 4) return -1;
107 if( ((p
[1] & 0xc0) != 0x80)
108 || ((p
[2] & 0xc0) != 0x80)
109 || ((p
[3] & 0xc0) != 0x80) ) return -3;
110 value
= ((unsigned long)(*p
++ & 0x7)) << 18;
111 value
|= (*p
++ & 0x3f) << 12;
112 value
|= (*p
++ & 0x3f) << 6;
113 value
|= *p
++ & 0x3f;
114 if(value
< 0x10000) return -4;
116 } else if((*p
& 0xfc) == 0xf8) {
117 if(len
< 5) return -1;
118 if( ((p
[1] & 0xc0) != 0x80)
119 || ((p
[2] & 0xc0) != 0x80)
120 || ((p
[3] & 0xc0) != 0x80)
121 || ((p
[4] & 0xc0) != 0x80) ) return -3;
122 value
= ((unsigned long)(*p
++ & 0x3)) << 24;
123 value
|= ((unsigned long)(*p
++ & 0x3f)) << 18;
124 value
|= ((unsigned long)(*p
++ & 0x3f)) << 12;
125 value
|= (*p
++ & 0x3f) << 6;
126 value
|= *p
++ & 0x3f;
127 if(value
< 0x200000) return -4;
129 } else if((*p
& 0xfe) == 0xfc) {
130 if(len
< 6) return -1;
131 if( ((p
[1] & 0xc0) != 0x80)
132 || ((p
[2] & 0xc0) != 0x80)
133 || ((p
[3] & 0xc0) != 0x80)
134 || ((p
[4] & 0xc0) != 0x80)
135 || ((p
[5] & 0xc0) != 0x80) ) return -3;
136 value
= ((unsigned long)(*p
++ & 0x1)) << 30;
137 value
|= ((unsigned long)(*p
++ & 0x3f)) << 24;
138 value
|= ((unsigned long)(*p
++ & 0x3f)) << 18;
139 value
|= ((unsigned long)(*p
++ & 0x3f)) << 12;
140 value
|= (*p
++ & 0x3f) << 6;
141 value
|= *p
++ & 0x3f;
142 if(value
< 0x4000000) return -4;
149 /* This takes a character 'value' and writes the UTF8 encoded value in
150 * 'str' where 'str' is a buffer containing 'len' characters. Returns
151 * the number of characters written or -1 if 'len' is too small. 'str' can
152 * be set to NULL in which case it just returns the number of characters.
153 * It will need at most 6 characters.
156 int UTF8_putc(unsigned char *str
, int len
, unsigned long value
)
158 if(!str
) len
= 6; /* Maximum we will need */
159 else if(len
<= 0) return -1;
161 if(str
) *str
= (unsigned char)value
;
165 if(len
< 2) return -1;
167 *str
++ = (unsigned char)(((value
>> 6) & 0x1f) | 0xc0);
168 *str
= (unsigned char)((value
& 0x3f) | 0x80);
172 if(value
< 0x10000) {
173 if(len
< 3) return -1;
175 *str
++ = (unsigned char)(((value
>> 12) & 0xf) | 0xe0);
176 *str
++ = (unsigned char)(((value
>> 6) & 0x3f) | 0x80);
177 *str
= (unsigned char)((value
& 0x3f) | 0x80);
181 if(value
< 0x200000) {
182 if(len
< 4) return -1;
184 *str
++ = (unsigned char)(((value
>> 18) & 0x7) | 0xf0);
185 *str
++ = (unsigned char)(((value
>> 12) & 0x3f) | 0x80);
186 *str
++ = (unsigned char)(((value
>> 6) & 0x3f) | 0x80);
187 *str
= (unsigned char)((value
& 0x3f) | 0x80);
191 if(value
< 0x4000000) {
192 if(len
< 5) return -1;
194 *str
++ = (unsigned char)(((value
>> 24) & 0x3) | 0xf8);
195 *str
++ = (unsigned char)(((value
>> 18) & 0x3f) | 0x80);
196 *str
++ = (unsigned char)(((value
>> 12) & 0x3f) | 0x80);
197 *str
++ = (unsigned char)(((value
>> 6) & 0x3f) | 0x80);
198 *str
= (unsigned char)((value
& 0x3f) | 0x80);
202 if(len
< 6) return -1;
204 *str
++ = (unsigned char)(((value
>> 30) & 0x1) | 0xfc);
205 *str
++ = (unsigned char)(((value
>> 24) & 0x3f) | 0x80);
206 *str
++ = (unsigned char)(((value
>> 18) & 0x3f) | 0x80);
207 *str
++ = (unsigned char)(((value
>> 12) & 0x3f) | 0x80);
208 *str
++ = (unsigned char)(((value
>> 6) & 0x3f) | 0x80);
209 *str
= (unsigned char)((value
& 0x3f) | 0x80);