| commit | author | age | ||
| 4e17e6 | 1 | <?php |
| T | 2 | |
| c8c1a3 | 3 | /* |
| T | 4 | * Copyright (C) 2000 Edmund Grimley Evans <edmundo@rano.org> |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License as published by | |
| 8 | * the Free Software Foundation; either version 2 of the License, or | |
| 9 | * (at your option) any later version. | |
| 10 | * | |
| 11 | * This program is distributed in the hope that it will be useful, | |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 | * GNU General Public License for more details. | |
| 15 | * | |
| 16 | * Translated from C to PHP by Thomas Bruederli <roundcube@gmail.com> | |
| 17 | */ | |
| 4e17e6 | 18 | |
| T | 19 | |
| c8c1a3 | 20 | /** |
| T | 21 | * Convert the data ($str) from RFC 2060's UTF-7 to UTF-8. |
| 22 | * If input data is invalid, return the original input string. | |
| 23 | * RFC 2060 obviously intends the encoding to be unique (see | |
| 24 | * point 5 in section 5.1.3), so we reject any non-canonical | |
| 25 | * form, such as &ACY- (instead of &-) or &AMA-&AMA- (instead | |
| 26 | * of &AMAAwA-). | |
| 27 | */ | |
| 28 | function utf7_to_utf8($str) | |
| 4e17e6 | 29 | { |
| c8c1a3 | 30 | $Index_64 = array( |
| T | 31 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
| 32 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, | |
| 33 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, 63,-1,-1,-1, | |
| 34 | 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1, | |
| 35 | -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14, | |
| 36 | 15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1, | |
| 37 | -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40, | |
| 38 | 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1 | |
| 39 | ); | |
| 4e17e6 | 40 | |
| c8c1a3 | 41 | $u7len = strlen($str); |
| 0a5e6a | 42 | $str = strval($str); |
| c8c1a3 | 43 | $p = $err = ''; |
| 4e17e6 | 44 | |
| c8c1a3 | 45 | for ($i=0; $u7len > 0; $i++, $u7len--) |
| 4e17e6 | 46 | { |
| 0a5e6a | 47 | $u7 = $str[$i]; |
| c8c1a3 | 48 | if ($u7 == '&') |
| 4e17e6 | 49 | { |
| c8c1a3 | 50 | $i++; |
| T | 51 | $u7len--; |
| 0a5e6a | 52 | $u7 = $str[$i]; |
| c8c1a3 | 53 | |
| T | 54 | if ($u7len && $u7 == '-') |
| 4e17e6 | 55 | { |
| c8c1a3 | 56 | $p .= '&'; |
| T | 57 | continue; |
| 4e17e6 | 58 | } |
| c8c1a3 | 59 | |
| T | 60 | $ch = 0; |
| 61 | $k = 10; | |
| 62 | for (; $u7len > 0; $i++, $u7len--) | |
| 63 | { | |
| 0a5e6a | 64 | $u7 = $str[$i]; |
| c8c1a3 | 65 | |
| T | 66 | if ((ord($u7) & 0x80) || ($b = $Index_64[ord($u7)]) == -1) |
| 67 | break; | |
| 68 | ||
| 69 | if ($k > 0) | |
| 70 | { | |
| 71 | $ch |= $b << $k; | |
| 72 | $k -= 6; | |
| 73 | } | |
| 74 | else | |
| 75 | { | |
| 76 | $ch |= $b >> (-$k); | |
| 77 | if ($ch < 0x80) | |
| 78 | { | |
| 79 | /* Printable US-ASCII */ | |
| 80 | if (0x20 <= $ch && $ch < 0x7f) | |
| 81 | return $err; | |
| 82 | $p .= chr($ch); | |
| 83 | } | |
| 84 | else if ($ch < 0x800) | |
| 85 | { | |
| 86 | $p .= chr(0xc0 | ($ch >> 6)); | |
| 87 | $p .= chr(0x80 | ($ch & 0x3f)); | |
| 88 | } | |
| 89 | else | |
| 90 | { | |
| 91 | $p .= chr(0xe0 | ($ch >> 12)); | |
| 92 | $p .= chr(0x80 | (($ch >> 6) & 0x3f)); | |
| 93 | $p .= chr(0x80 | ($ch & 0x3f)); | |
| 94 | } | |
| 95 | ||
| 96 | $ch = ($b << (16 + $k)) & 0xffff; | |
| 97 | $k += 10; | |
| 98 | } | |
| 99 | } | |
| 100 | ||
| 101 | /* Non-zero or too many extra bits */ | |
| 102 | if ($ch || $k < 6) | |
| 103 | return $err; | |
| 104 | ||
| 105 | /* BASE64 not properly terminated */ | |
| 106 | if (!$u7len || $u7 != '-') | |
| 107 | return $err; | |
| 108 | ||
| 109 | /* Adjacent BASE64 sections */ | |
| 0a5e6a | 110 | if ($u7len > 2 && $str[$i+1] == '&' && $str[$i+2] != '-') |
| c8c1a3 | 111 | return $err; |
| 4e17e6 | 112 | } |
| c8c1a3 | 113 | /* Not printable US-ASCII */ |
| T | 114 | else if (ord($u7) < 0x20 || ord($u7) >= 0x7f) |
| 115 | return $err; | |
| 116 | else | |
| 117 | $p .= $u7; | |
| 118 | } | |
| 119 | ||
| 120 | return $p; | |
| 121 | } | |
| 122 | ||
| 123 | ||
| 124 | /** | |
| 125 | * Convert the data ($str) from UTF-8 to RFC 2060's UTF-7. | |
| 126 | * Unicode characters above U+FFFF are replaced by U+FFFE. | |
| 127 | * If input data is invalid, return an empty string. | |
| 128 | */ | |
| 129 | function utf8_to_utf7($str) | |
| 130 | { | |
| 131 | $B64Chars = array( | |
| 132 | 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', | |
| 133 | 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', | |
| 134 | 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', | |
| 135 | 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', | |
| 136 | '8', '9', '+', ',' | |
| 137 | ); | |
| 138 | ||
| 139 | $u8len = strlen($str); | |
| 140 | $base64 = $i = 0; | |
| 141 | $p = $err = ''; | |
| 142 | ||
| 143 | while ($u8len) | |
| 144 | { | |
| 0a5e6a | 145 | $u8 = $str[$i]; |
| c8c1a3 | 146 | $c = ord($u8); |
| T | 147 | |
| 148 | if ($c < 0x80) | |
| 4e17e6 | 149 | { |
| c8c1a3 | 150 | $ch = $c; |
| T | 151 | $n = 0; |
| 152 | } | |
| 153 | else if ($c < 0xc2) | |
| 154 | return $err; | |
| 155 | else if ($c < 0xe0) | |
| 156 | { | |
| 157 | $ch = $c & 0x1f; | |
| 158 | $n = 1; | |
| 159 | } | |
| 160 | else if ($c < 0xf0) | |
| 161 | { | |
| 162 | $ch = $c & 0x0f; | |
| 163 | $n = 2; | |
| 164 | } | |
| 165 | else if ($c < 0xf8) | |
| 166 | { | |
| 167 | $ch = $c & 0x07; | |
| 168 | $n = 3; | |
| 169 | } | |
| 170 | else if ($c < 0xfc) | |
| 171 | { | |
| 172 | $ch = $c & 0x03; | |
| 173 | $n = 4; | |
| 174 | } | |
| 175 | else if ($c < 0xfe) | |
| 176 | { | |
| 177 | $ch = $c & 0x01; | |
| 178 | $n = 5; | |
| 179 | } | |
| 180 | else | |
| 181 | return $err; | |
| 182 | ||
| 183 | $i++; | |
| 184 | $u8len--; | |
| 185 | ||
| 186 | if ($n > $u8len) | |
| 187 | return $err; | |
| 188 | ||
| 189 | for ($j=0; $j < $n; $j++) | |
| 190 | { | |
| 0a5e6a | 191 | $o = ord($str[$i+$j]); |
| c8c1a3 | 192 | if (($o & 0xc0) != 0x80) |
| T | 193 | return $err; |
| 194 | $ch = ($ch << 6) | ($o & 0x3f); | |
| 195 | } | |
| 196 | ||
| 197 | if ($n > 1 && !($ch >> ($n * 5 + 1))) | |
| 198 | return $err; | |
| 199 | ||
| 200 | $i += $n; | |
| 201 | $u8len -= $n; | |
| 202 | ||
| 203 | if ($ch < 0x20 || $ch >= 0x7f) | |
| 204 | { | |
| 205 | if (!$base64) | |
| 4e17e6 | 206 | { |
| c8c1a3 | 207 | $p .= '&'; |
| T | 208 | $base64 = 1; |
| 209 | $b = 0; | |
| 210 | $k = 10; | |
| 4e17e6 | 211 | } |
| c8c1a3 | 212 | if ($ch & ~0xffff) |
| T | 213 | $ch = 0xfffe; |
| 214 | ||
| 215 | $p .= $B64Chars[($b | $ch >> $k)]; | |
| 216 | $k -= 6; | |
| 217 | for (; $k >= 0; $k -= 6) | |
| 218 | $p .= $B64Chars[(($ch >> $k) & 0x3f)]; | |
| 219 | ||
| 220 | $b = ($ch << (-$k)) & 0x3f; | |
| 221 | $k += 16; | |
| 4e17e6 | 222 | } |
| T | 223 | else |
| 224 | { | |
| c8c1a3 | 225 | if ($base64) |
| 4e17e6 | 226 | { |
| c8c1a3 | 227 | if ($k > 10) |
| T | 228 | $p .= $B64Chars[$b]; |
| 229 | $p .= '-'; | |
| 230 | $base64 = 0; | |
| 4e17e6 | 231 | } |
| c8c1a3 | 232 | |
| T | 233 | $p .= chr($ch); |
| 234 | if (chr($ch) == '&') | |
| 235 | $p .= '-'; | |
| 4e17e6 | 236 | } |
| T | 237 | } |
| 238 | ||
| c8c1a3 | 239 | if ($base64) |
| 4e17e6 | 240 | { |
| c8c1a3 | 241 | if ($k > 10) |
| T | 242 | $p .= $B64Chars[$b]; |
| 243 | $p .= '-'; | |
| 4e17e6 | 244 | } |
| T | 245 | |
| c8c1a3 | 246 | return $p; |
| T | 247 | } |
| 4e17e6 | 248 | |
| T | 249 | ?> |
