[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/asn1.h>
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| 13 |
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| 14 | /* UTF8 utilities */
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| 15 |
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| 16 | /*-
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| 17 | * This parses a UTF8 string one character at a time. It is passed a pointer
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| 18 | * to the string and the length of the string. It sets 'value' to the value of
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| 19 | * the current character. It returns the number of characters read or a
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| 20 | * negative error code:
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| 21 | * -1 = string too short
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| 22 | * -2 = illegal character
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| 23 | * -3 = subsequent characters not of the form 10xxxxxx
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| 24 | * -4 = character encoded incorrectly (not minimal length).
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| 25 | */
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| 26 |
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| 27 | int UTF8_getc(const unsigned char *str, int len, unsigned long *val)
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| 28 | {
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| 29 | const unsigned char *p;
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| 30 | unsigned long value;
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| 31 | int ret;
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| 32 | if (len <= 0)
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| 33 | return 0;
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| 34 | p = str;
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| 35 |
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| 36 | /* Check syntax and work out the encoded value (if correct) */
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| 37 | if ((*p & 0x80) == 0) {
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| 38 | value = *p++ & 0x7f;
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| 39 | ret = 1;
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| 40 | } else if ((*p & 0xe0) == 0xc0) {
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| 41 | if (len < 2)
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| 42 | return -1;
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| 43 | if ((p[1] & 0xc0) != 0x80)
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| 44 | return -3;
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| 45 | value = (*p++ & 0x1f) << 6;
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| 46 | value |= *p++ & 0x3f;
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| 47 | if (value < 0x80)
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| 48 | return -4;
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| 49 | ret = 2;
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| 50 | } else if ((*p & 0xf0) == 0xe0) {
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| 51 | if (len < 3)
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| 52 | return -1;
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| 53 | if (((p[1] & 0xc0) != 0x80)
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| 54 | || ((p[2] & 0xc0) != 0x80))
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| 55 | return -3;
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| 56 | value = (*p++ & 0xf) << 12;
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| 57 | value |= (*p++ & 0x3f) << 6;
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| 58 | value |= *p++ & 0x3f;
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| 59 | if (value < 0x800)
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| 60 | return -4;
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| 61 | ret = 3;
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| 62 | } else if ((*p & 0xf8) == 0xf0) {
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| 63 | if (len < 4)
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| 64 | return -1;
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| 65 | if (((p[1] & 0xc0) != 0x80)
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| 66 | || ((p[2] & 0xc0) != 0x80)
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| 67 | || ((p[3] & 0xc0) != 0x80))
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| 68 | return -3;
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| 69 | value = ((unsigned long)(*p++ & 0x7)) << 18;
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| 70 | value |= (*p++ & 0x3f) << 12;
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| 71 | value |= (*p++ & 0x3f) << 6;
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| 72 | value |= *p++ & 0x3f;
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| 73 | if (value < 0x10000)
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| 74 | return -4;
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| 75 | ret = 4;
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| 76 | } else if ((*p & 0xfc) == 0xf8) {
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| 77 | if (len < 5)
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| 78 | return -1;
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| 79 | if (((p[1] & 0xc0) != 0x80)
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| 80 | || ((p[2] & 0xc0) != 0x80)
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| 81 | || ((p[3] & 0xc0) != 0x80)
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| 82 | || ((p[4] & 0xc0) != 0x80))
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| 83 | return -3;
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| 84 | value = ((unsigned long)(*p++ & 0x3)) << 24;
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| 85 | value |= ((unsigned long)(*p++ & 0x3f)) << 18;
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| 86 | value |= ((unsigned long)(*p++ & 0x3f)) << 12;
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| 87 | value |= (*p++ & 0x3f) << 6;
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| 88 | value |= *p++ & 0x3f;
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| 89 | if (value < 0x200000)
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| 90 | return -4;
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| 91 | ret = 5;
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| 92 | } else if ((*p & 0xfe) == 0xfc) {
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| 93 | if (len < 6)
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| 94 | return -1;
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| 95 | if (((p[1] & 0xc0) != 0x80)
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| 96 | || ((p[2] & 0xc0) != 0x80)
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| 97 | || ((p[3] & 0xc0) != 0x80)
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| 98 | || ((p[4] & 0xc0) != 0x80)
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| 99 | || ((p[5] & 0xc0) != 0x80))
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| 100 | return -3;
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| 101 | value = ((unsigned long)(*p++ & 0x1)) << 30;
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| 102 | value |= ((unsigned long)(*p++ & 0x3f)) << 24;
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| 103 | value |= ((unsigned long)(*p++ & 0x3f)) << 18;
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| 104 | value |= ((unsigned long)(*p++ & 0x3f)) << 12;
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| 105 | value |= (*p++ & 0x3f) << 6;
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| 106 | value |= *p++ & 0x3f;
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| 107 | if (value < 0x4000000)
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| 108 | return -4;
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| 109 | ret = 6;
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| 110 | } else
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| 111 | return -2;
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| 112 | *val = value;
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| 113 | return ret;
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| 114 | }
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| 115 |
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| 116 | /*
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| 117 | * This takes a character 'value' and writes the UTF8 encoded value in 'str'
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| 118 | * where 'str' is a buffer containing 'len' characters. Returns the number of
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| 119 | * characters written or -1 if 'len' is too small. 'str' can be set to NULL
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| 120 | * in which case it just returns the number of characters. It will need at
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| 121 | * most 6 characters.
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| 122 | */
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| 123 |
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| 124 | int UTF8_putc(unsigned char *str, int len, unsigned long value)
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| 125 | {
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| 126 | if (!str)
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| 127 | len = 6; /* Maximum we will need */
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| 128 | else if (len <= 0)
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| 129 | return -1;
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| 130 | if (value < 0x80) {
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| 131 | if (str)
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| 132 | *str = (unsigned char)value;
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| 133 | return 1;
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| 134 | }
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| 135 | if (value < 0x800) {
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| 136 | if (len < 2)
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| 137 | return -1;
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| 138 | if (str) {
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| 139 | *str++ = (unsigned char)(((value >> 6) & 0x1f) | 0xc0);
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| 140 | *str = (unsigned char)((value & 0x3f) | 0x80);
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| 141 | }
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| 142 | return 2;
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| 143 | }
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| 144 | if (value < 0x10000) {
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| 145 | if (len < 3)
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| 146 | return -1;
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| 147 | if (str) {
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| 148 | *str++ = (unsigned char)(((value >> 12) & 0xf) | 0xe0);
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| 149 | *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
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| 150 | *str = (unsigned char)((value & 0x3f) | 0x80);
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| 151 | }
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| 152 | return 3;
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| 153 | }
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| 154 | if (value < 0x200000) {
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| 155 | if (len < 4)
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| 156 | return -1;
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| 157 | if (str) {
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| 158 | *str++ = (unsigned char)(((value >> 18) & 0x7) | 0xf0);
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| 159 | *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
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| 160 | *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
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| 161 | *str = (unsigned char)((value & 0x3f) | 0x80);
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| 162 | }
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| 163 | return 4;
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| 164 | }
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| 165 | if (value < 0x4000000) {
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| 166 | if (len < 5)
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| 167 | return -1;
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| 168 | if (str) {
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| 169 | *str++ = (unsigned char)(((value >> 24) & 0x3) | 0xf8);
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| 170 | *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80);
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| 171 | *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
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| 172 | *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
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| 173 | *str = (unsigned char)((value & 0x3f) | 0x80);
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| 174 | }
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| 175 | return 5;
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| 176 | }
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| 177 | if (len < 6)
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| 178 | return -1;
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| 179 | if (str) {
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| 180 | *str++ = (unsigned char)(((value >> 30) & 0x1) | 0xfc);
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| 181 | *str++ = (unsigned char)(((value >> 24) & 0x3f) | 0x80);
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| 182 | *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80);
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| 183 | *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
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| 184 | *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
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| 185 | *str = (unsigned char)((value & 0x3f) | 0x80);
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| 186 | }
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| 187 | return 6;
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| 188 | }
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