1 /* $OpenBSD: a_utf8.c,v 1.8 2014/07/11 08:44:47 jsing Exp $ */ 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 61 #include <openssl/asn1.h> 62 63 #include "asn1_locl.h" 64 65 /* UTF8 utilities */ 66 67 /* 68 * This parses a UTF8 string one character at a time. It is passed a pointer 69 * to the string and the length of the string. It sets 'value' to the value of 70 * the current character. It returns the number of characters read or a 71 * negative error code: 72 * -1 = string too short 73 * -2 = illegal character 74 * -3 = subsequent characters not of the form 10xxxxxx 75 * -4 = character encoded incorrectly (not minimal length). 76 */ 77 78 int 79 UTF8_getc(const unsigned char *str, int len, unsigned long *val) 80 { 81 const unsigned char *p; 82 unsigned long value; 83 int ret; 84 if (len <= 0) 85 return 0; 86 p = str; 87 88 /* Check syntax and work out the encoded value (if correct) */ 89 if ((*p & 0x80) == 0) { 90 value = *p++ & 0x7f; 91 ret = 1; 92 } else if ((*p & 0xe0) == 0xc0) { 93 if (*p < 0xc2) 94 return -2; 95 if (len < 2) 96 return -1; 97 if ((p[1] & 0xc0) != 0x80) 98 return -3; 99 value = (*p++ & 0x1f) << 6; 100 value |= *p++ & 0x3f; 101 if (value < 0x80) 102 return -4; 103 ret = 2; 104 } else if ((*p & 0xf0) == 0xe0) { 105 if (len < 3) 106 return -1; 107 if (((p[1] & 0xc0) != 0x80) || 108 ((p[2] & 0xc0) != 0x80)) 109 return -3; 110 value = (*p++ & 0xf) << 12; 111 value |= (*p++ & 0x3f) << 6; 112 value |= *p++ & 0x3f; 113 if (value < 0x800) 114 return -4; 115 /* surrogate pair code points are not valid */ 116 if (value >= 0xd800 && value < 0xe000) 117 return -2; 118 ret = 3; 119 } else if ((*p & 0xf8) == 0xf0 && (*p < 0xf5)) { 120 if (len < 4) 121 return -1; 122 if (((p[1] & 0xc0) != 0x80) || 123 ((p[2] & 0xc0) != 0x80) || 124 ((p[3] & 0xc0) != 0x80)) 125 return -3; 126 value = ((unsigned long)(*p++ & 0x7)) << 18; 127 value |= (*p++ & 0x3f) << 12; 128 value |= (*p++ & 0x3f) << 6; 129 value |= *p++ & 0x3f; 130 if (value < 0x10000) 131 return -4; 132 if (value > UNICODE_MAX) 133 return -2; 134 ret = 4; 135 } else 136 return -2; 137 *val = value; 138 return ret; 139 } 140 141 /* This takes a Unicode code point 'value' and writes its UTF-8 encoded form 142 * in 'str' where 'str' is a buffer of at least length 'len'. If 'str' 143 * is NULL, then nothing is written and just the return code is determined. 144 145 * Returns less than zero on error: 146 * -1 if 'str' is not NULL and 'len' is too small 147 * -2 if 'value' is an invalid character (surrogate or out-of-range) 148 * 149 * Otherwise, returns the number of bytes in 'value's encoded form 150 * (i.e., the number of bytes written to 'str' when it's not NULL). 151 * 152 * It will need at most 4 characters. 153 */ 154 155 int 156 UTF8_putc(unsigned char *str, int len, unsigned long value) 157 { 158 if (value < 0x80) { 159 if (str != NULL) { 160 if (len < 1) 161 return -1; 162 str[0] = (unsigned char)value; 163 } 164 return 1; 165 } 166 if (value < 0x800) { 167 if (str != NULL) { 168 if (len < 2) 169 return -1; 170 str[0] = (unsigned char)(((value >> 6) & 0x1f) | 0xc0); 171 str[1] = (unsigned char)((value & 0x3f) | 0x80); 172 } 173 return 2; 174 } 175 if (value < 0x10000) { 176 if (UNICODE_IS_SURROGATE(value)) 177 return -2; 178 if (str != NULL) { 179 if (len < 3) 180 return -1; 181 str[0] = (unsigned char)(((value >> 12) & 0xf) | 0xe0); 182 str[1] = (unsigned char)(((value >> 6) & 0x3f) | 0x80); 183 str[2] = (unsigned char)((value & 0x3f) | 0x80); 184 } 185 return 3; 186 } 187 if (value <= UNICODE_MAX) { 188 if (str != NULL) { 189 if (len < 4) 190 return -1; 191 str[0] = (unsigned char)(((value >> 18) & 0x7) | 0xf0); 192 str[1] = (unsigned char)(((value >> 12) & 0x3f) | 0x80); 193 str[2] = (unsigned char)(((value >> 6) & 0x3f) | 0x80); 194 str[3] = (unsigned char)((value & 0x3f) | 0x80); 195 } 196 return 4; 197 } 198 return -2; 199 } 200