geekwright /
XoopsCore25
| Total Complexity | 110 |
| Total Lines | 607 |
| Duplicated Lines | 0 % |
| Changes | 0 | ||
Complex classes like HTMLPurifier_Encoder often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use HTMLPurifier_Encoder, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 7 | class HTMLPurifier_Encoder |
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| 8 | { |
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| 9 | |||
| 10 | /** |
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| 11 | * Constructor throws fatal error if you attempt to instantiate class |
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| 12 | */ |
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| 13 | private function __construct() |
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| 14 | { |
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| 15 | trigger_error('Cannot instantiate encoder, call methods statically', E_USER_ERROR); |
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| 16 | } |
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| 17 | |||
| 18 | /** |
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| 19 | * Error-handler that mutes errors, alternative to shut-up operator. |
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| 20 | */ |
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| 21 | public static function muteErrorHandler() |
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| 23 | } |
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| 24 | |||
| 25 | /** |
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| 26 | * iconv wrapper which mutes errors, but doesn't work around bugs. |
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| 27 | * @param string $in Input encoding |
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| 28 | * @param string $out Output encoding |
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| 29 | * @param string $text The text to convert |
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| 30 | * @return string |
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| 31 | */ |
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| 32 | public static function unsafeIconv($in, $out, $text) |
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| 33 | { |
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| 34 | set_error_handler(array('HTMLPurifier_Encoder', 'muteErrorHandler')); |
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| 35 | $r = iconv($in, $out, $text); |
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| 36 | restore_error_handler(); |
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| 37 | return $r; |
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| 38 | } |
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| 39 | |||
| 40 | /** |
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| 41 | * iconv wrapper which mutes errors and works around bugs. |
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| 42 | * @param string $in Input encoding |
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| 43 | * @param string $out Output encoding |
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| 44 | * @param string $text The text to convert |
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| 45 | * @param int $max_chunk_size |
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| 46 | * @return string |
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| 47 | */ |
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| 48 | public static function iconv($in, $out, $text, $max_chunk_size = 8000) |
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| 95 | } |
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| 96 | } |
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| 97 | |||
| 98 | /** |
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| 99 | * Cleans a UTF-8 string for well-formedness and SGML validity |
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| 100 | * |
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| 101 | * It will parse according to UTF-8 and return a valid UTF8 string, with |
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| 102 | * non-SGML codepoints excluded. |
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| 103 | * |
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| 104 | * Specifically, it will permit: |
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| 105 | * \x{9}\x{A}\x{D}\x{20}-\x{7E}\x{A0}-\x{D7FF}\x{E000}-\x{FFFD}\x{10000}-\x{10FFFF} |
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| 106 | * Source: https://www.w3.org/TR/REC-xml/#NT-Char |
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| 107 | * Arguably this function should be modernized to the HTML5 set |
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| 108 | * of allowed characters: |
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| 109 | * https://www.w3.org/TR/html5/syntax.html#preprocessing-the-input-stream |
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| 110 | * which simultaneously expand and restrict the set of allowed characters. |
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| 111 | * |
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| 112 | * @param string $str The string to clean |
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| 113 | * @param bool $force_php |
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| 114 | * @return string |
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| 115 | * |
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| 116 | * @note Just for reference, the non-SGML code points are 0 to 31 and |
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| 117 | * 127 to 159, inclusive. However, we allow code points 9, 10 |
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| 118 | * and 13, which are the tab, line feed and carriage return |
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| 119 | * respectively. 128 and above the code points map to multibyte |
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| 120 | * UTF-8 representations. |
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| 121 | * |
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| 122 | * @note Fallback code adapted from utf8ToUnicode by Henri Sivonen and |
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| 123 | * [email protected] at <http://iki.fi/hsivonen/php-utf8/> under the |
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| 124 | * LGPL license. Notes on what changed are inside, but in general, |
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| 125 | * the original code transformed UTF-8 text into an array of integer |
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| 126 | * Unicode codepoints. Understandably, transforming that back to |
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| 127 | * a string would be somewhat expensive, so the function was modded to |
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| 128 | * directly operate on the string. However, this discourages code |
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| 129 | * reuse, and the logic enumerated here would be useful for any |
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| 130 | * function that needs to be able to understand UTF-8 characters. |
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| 131 | * As of right now, only smart lossless character encoding converters |
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| 132 | * would need that, and I'm probably not going to implement them. |
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| 133 | */ |
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| 134 | public static function cleanUTF8($str, $force_php = false) |
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| 135 | { |
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| 136 | // UTF-8 validity is checked since PHP 4.3.5 |
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| 137 | // This is an optimization: if the string is already valid UTF-8, no |
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| 138 | // need to do PHP stuff. 99% of the time, this will be the case. |
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| 139 | if (preg_match( |
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| 140 | '/^[\x{9}\x{A}\x{D}\x{20}-\x{7E}\x{A0}-\x{D7FF}\x{E000}-\x{FFFD}\x{10000}-\x{10FFFF}]*$/Du', |
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| 141 | $str |
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| 142 | )) { |
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| 143 | return $str; |
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| 144 | } |
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| 145 | |||
| 146 | $mState = 0; // cached expected number of octets after the current octet |
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| 147 | // until the beginning of the next UTF8 character sequence |
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| 148 | $mUcs4 = 0; // cached Unicode character |
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| 149 | $mBytes = 1; // cached expected number of octets in the current sequence |
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| 150 | |||
| 151 | // original code involved an $out that was an array of Unicode |
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| 152 | // codepoints. Instead of having to convert back into UTF-8, we've |
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| 153 | // decided to directly append valid UTF-8 characters onto a string |
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| 154 | // $out once they're done. $char accumulates raw bytes, while $mUcs4 |
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| 155 | // turns into the Unicode code point, so there's some redundancy. |
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| 156 | |||
| 157 | $out = ''; |
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| 158 | $char = ''; |
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| 159 | |||
| 160 | $len = strlen($str); |
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| 161 | for ($i = 0; $i < $len; $i++) { |
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| 162 | $in = ord($str[$i]); |
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| 163 | $char .= $str[$i]; // append byte to char |
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| 164 | if (0 == $mState) { |
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| 165 | // When mState is zero we expect either a US-ASCII character |
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| 166 | // or a multi-octet sequence. |
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| 167 | if (0 == (0x80 & ($in))) { |
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| 168 | // US-ASCII, pass straight through. |
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| 169 | if (($in <= 31 || $in == 127) && |
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| 170 | !($in == 9 || $in == 13 || $in == 10) // save \r\t\n |
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| 171 | ) { |
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| 172 | // control characters, remove |
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| 173 | } else { |
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| 174 | $out .= $char; |
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| 175 | } |
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| 176 | // reset |
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| 177 | $char = ''; |
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| 178 | $mBytes = 1; |
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| 179 | } elseif (0xC0 == (0xE0 & ($in))) { |
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| 180 | // First octet of 2 octet sequence |
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| 181 | $mUcs4 = ($in); |
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| 182 | $mUcs4 = ($mUcs4 & 0x1F) << 6; |
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| 183 | $mState = 1; |
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| 184 | $mBytes = 2; |
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| 185 | } elseif (0xE0 == (0xF0 & ($in))) { |
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| 186 | // First octet of 3 octet sequence |
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| 187 | $mUcs4 = ($in); |
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| 188 | $mUcs4 = ($mUcs4 & 0x0F) << 12; |
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| 189 | $mState = 2; |
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| 190 | $mBytes = 3; |
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| 191 | } elseif (0xF0 == (0xF8 & ($in))) { |
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| 192 | // First octet of 4 octet sequence |
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| 193 | $mUcs4 = ($in); |
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| 194 | $mUcs4 = ($mUcs4 & 0x07) << 18; |
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| 195 | $mState = 3; |
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| 196 | $mBytes = 4; |
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| 197 | } elseif (0xF8 == (0xFC & ($in))) { |
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| 198 | // First octet of 5 octet sequence. |
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| 199 | // |
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| 200 | // This is illegal because the encoded codepoint must be |
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| 201 | // either: |
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| 202 | // (a) not the shortest form or |
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| 203 | // (b) outside the Unicode range of 0-0x10FFFF. |
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| 204 | // Rather than trying to resynchronize, we will carry on |
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| 205 | // until the end of the sequence and let the later error |
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| 206 | // handling code catch it. |
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| 207 | $mUcs4 = ($in); |
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| 208 | $mUcs4 = ($mUcs4 & 0x03) << 24; |
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| 209 | $mState = 4; |
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| 210 | $mBytes = 5; |
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| 211 | } elseif (0xFC == (0xFE & ($in))) { |
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| 212 | // First octet of 6 octet sequence, see comments for 5 |
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| 213 | // octet sequence. |
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| 214 | $mUcs4 = ($in); |
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| 215 | $mUcs4 = ($mUcs4 & 1) << 30; |
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| 216 | $mState = 5; |
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| 217 | $mBytes = 6; |
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| 218 | } else { |
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| 219 | // Current octet is neither in the US-ASCII range nor a |
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| 220 | // legal first octet of a multi-octet sequence. |
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| 221 | $mState = 0; |
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| 222 | $mUcs4 = 0; |
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| 223 | $mBytes = 1; |
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| 224 | $char = ''; |
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| 225 | } |
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| 226 | } else { |
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| 227 | // When mState is non-zero, we expect a continuation of the |
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| 228 | // multi-octet sequence |
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| 229 | if (0x80 == (0xC0 & ($in))) { |
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| 230 | // Legal continuation. |
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| 231 | $shift = ($mState - 1) * 6; |
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| 232 | $tmp = $in; |
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| 233 | $tmp = ($tmp & 0x0000003F) << $shift; |
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| 234 | $mUcs4 |= $tmp; |
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| 235 | |||
| 236 | if (0 == --$mState) { |
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| 237 | // End of the multi-octet sequence. mUcs4 now contains |
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| 238 | // the final Unicode codepoint to be output |
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| 239 | |||
| 240 | // Check for illegal sequences and codepoints. |
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| 241 | |||
| 242 | // From Unicode 3.1, non-shortest form is illegal |
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| 243 | if (((2 == $mBytes) && ($mUcs4 < 0x0080)) || |
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| 244 | ((3 == $mBytes) && ($mUcs4 < 0x0800)) || |
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| 245 | ((4 == $mBytes) && ($mUcs4 < 0x10000)) || |
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| 246 | (4 < $mBytes) || |
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| 247 | // From Unicode 3.2, surrogate characters = illegal |
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| 248 | (($mUcs4 & 0xFFFFF800) == 0xD800) || |
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| 249 | // Codepoints outside the Unicode range are illegal |
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| 250 | ($mUcs4 > 0x10FFFF) |
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| 251 | ) { |
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| 252 | |||
| 253 | } elseif (0xFEFF != $mUcs4 && // omit BOM |
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| 254 | // check for valid Char unicode codepoints |
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| 255 | ( |
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| 256 | 0x9 == $mUcs4 || |
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| 257 | 0xA == $mUcs4 || |
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| 258 | 0xD == $mUcs4 || |
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| 259 | (0x20 <= $mUcs4 && 0x7E >= $mUcs4) || |
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| 260 | // 7F-9F is not strictly prohibited by XML, |
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| 261 | // but it is non-SGML, and thus we don't allow it |
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| 262 | (0xA0 <= $mUcs4 && 0xD7FF >= $mUcs4) || |
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| 263 | (0xE000 <= $mUcs4 && 0xFFFD >= $mUcs4) || |
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| 264 | (0x10000 <= $mUcs4 && 0x10FFFF >= $mUcs4) |
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| 265 | ) |
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| 266 | ) { |
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| 267 | $out .= $char; |
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| 268 | } |
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| 269 | // initialize UTF8 cache (reset) |
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| 270 | $mState = 0; |
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| 271 | $mUcs4 = 0; |
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| 272 | $mBytes = 1; |
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| 273 | $char = ''; |
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| 274 | } |
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| 275 | } else { |
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| 276 | // ((0xC0 & (*in) != 0x80) && (mState != 0)) |
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| 277 | // Incomplete multi-octet sequence. |
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| 278 | // used to result in complete fail, but we'll reset |
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| 279 | $mState = 0; |
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| 280 | $mUcs4 = 0; |
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| 281 | $mBytes = 1; |
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| 282 | $char =''; |
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| 283 | } |
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| 284 | } |
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| 285 | } |
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| 286 | return $out; |
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| 287 | } |
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| 288 | |||
| 289 | /** |
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| 290 | * Translates a Unicode codepoint into its corresponding UTF-8 character. |
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| 291 | * @note Based on Feyd's function at |
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| 292 | * <http://forums.devnetwork.net/viewtopic.php?p=191404#191404>, |
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| 293 | * which is in public domain. |
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| 294 | * @note While we're going to do code point parsing anyway, a good |
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| 295 | * optimization would be to refuse to translate code points that |
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| 296 | * are non-SGML characters. However, this could lead to duplication. |
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| 297 | * @note This is very similar to the unichr function in |
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| 298 | * maintenance/generate-entity-file.php (although this is superior, |
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| 299 | * due to its sanity checks). |
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| 300 | */ |
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| 301 | |||
| 302 | // +----------+----------+----------+----------+ |
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| 303 | // | 33222222 | 22221111 | 111111 | | |
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| 304 | // | 10987654 | 32109876 | 54321098 | 76543210 | bit |
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| 305 | // +----------+----------+----------+----------+ |
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| 306 | // | | | | 0xxxxxxx | 1 byte 0x00000000..0x0000007F |
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| 307 | // | | | 110yyyyy | 10xxxxxx | 2 byte 0x00000080..0x000007FF |
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| 308 | // | | 1110zzzz | 10yyyyyy | 10xxxxxx | 3 byte 0x00000800..0x0000FFFF |
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| 309 | // | 11110www | 10wwzzzz | 10yyyyyy | 10xxxxxx | 4 byte 0x00010000..0x0010FFFF |
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| 310 | // +----------+----------+----------+----------+ |
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| 311 | // | 00000000 | 00011111 | 11111111 | 11111111 | Theoretical upper limit of legal scalars: 2097151 (0x001FFFFF) |
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| 312 | // | 00000000 | 00010000 | 11111111 | 11111111 | Defined upper limit of legal scalar codes |
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| 313 | // +----------+----------+----------+----------+ |
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| 314 | |||
| 315 | public static function unichr($code) |
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| 357 | } |
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| 358 | |||
| 359 | /** |
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| 360 | * @return bool |
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| 361 | */ |
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| 362 | public static function iconvAvailable() |
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| 369 | } |
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| 370 | |||
| 371 | /** |
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| 372 | * Convert a string to UTF-8 based on configuration. |
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| 373 | * @param string $str The string to convert |
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| 374 | * @param HTMLPurifier_Config $config |
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| 375 | * @param HTMLPurifier_Context $context |
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| 376 | * @return string |
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| 377 | */ |
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| 378 | public static function convertToUTF8($str, $config, $context) |
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| 379 | { |
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| 380 | $encoding = $config->get('Core.Encoding'); |
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| 381 | if ($encoding === 'utf-8') { |
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| 382 | return $str; |
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| 383 | } |
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| 384 | static $iconv = null; |
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| 385 | if ($iconv === null) { |
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| 386 | $iconv = self::iconvAvailable(); |
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| 387 | } |
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| 388 | if ($iconv && !$config->get('Test.ForceNoIconv')) { |
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| 389 | // unaffected by bugs, since UTF-8 support all characters |
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| 390 | $str = self::unsafeIconv($encoding, 'utf-8//IGNORE', $str); |
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| 391 | if ($str === false) { |
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| 392 | // $encoding is not a valid encoding |
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| 393 | trigger_error('Invalid encoding ' . $encoding, E_USER_ERROR); |
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| 394 | return ''; |
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| 395 | } |
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| 396 | // If the string is bjorked by Shift_JIS or a similar encoding |
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| 397 | // that doesn't support all of ASCII, convert the naughty |
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| 398 | // characters to their true byte-wise ASCII/UTF-8 equivalents. |
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| 399 | $str = strtr($str, self::testEncodingSupportsASCII($encoding)); |
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| 400 | return $str; |
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| 401 | } elseif ($encoding === 'iso-8859-1' && function_exists('mb_convert_encoding')) { |
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| 402 | $str = mb_convert_encoding($str, 'UTF-8', 'ISO-8859-1'); |
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| 403 | return $str; |
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| 404 | } |
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| 405 | $bug = HTMLPurifier_Encoder::testIconvTruncateBug(); |
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| 406 | if ($bug == self::ICONV_OK) { |
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| 407 | trigger_error('Encoding not supported, please install iconv', E_USER_ERROR); |
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| 408 | } else { |
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| 409 | trigger_error( |
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| 410 | 'You have a buggy version of iconv, see https://bugs.php.net/bug.php?id=48147 ' . |
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| 411 | 'and http://sourceware.org/bugzilla/show_bug.cgi?id=13541', |
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| 412 | E_USER_ERROR |
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| 413 | ); |
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| 414 | } |
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| 415 | } |
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| 416 | |||
| 417 | /** |
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| 418 | * Converts a string from UTF-8 based on configuration. |
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| 419 | * @param string $str The string to convert |
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| 420 | * @param HTMLPurifier_Config $config |
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| 421 | * @param HTMLPurifier_Context $context |
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| 422 | * @return string |
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| 423 | * @note Currently, this is a lossy conversion, with unexpressable |
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| 424 | * characters being omitted. |
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| 425 | */ |
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| 426 | public static function convertFromUTF8($str, $config, $context) |
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| 427 | { |
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| 428 | $encoding = $config->get('Core.Encoding'); |
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| 429 | if ($escape = $config->get('Core.EscapeNonASCIICharacters')) { |
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| 430 | $str = self::convertToASCIIDumbLossless($str); |
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| 431 | } |
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| 432 | if ($encoding === 'utf-8') { |
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| 433 | return $str; |
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| 434 | } |
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| 435 | static $iconv = null; |
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| 436 | if ($iconv === null) { |
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| 437 | $iconv = self::iconvAvailable(); |
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| 438 | } |
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| 439 | if ($iconv && !$config->get('Test.ForceNoIconv')) { |
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| 440 | // Undo our previous fix in convertToUTF8, otherwise iconv will barf |
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| 441 | $ascii_fix = self::testEncodingSupportsASCII($encoding); |
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| 442 | if (!$escape && !empty($ascii_fix)) { |
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| 443 | $clear_fix = array(); |
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| 444 | foreach ($ascii_fix as $utf8 => $native) { |
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| 445 | $clear_fix[$utf8] = ''; |
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| 446 | } |
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| 447 | $str = strtr($str, $clear_fix); |
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| 448 | } |
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| 449 | $str = strtr($str, array_flip($ascii_fix)); |
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| 450 | // Normal stuff |
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| 451 | $str = self::iconv('utf-8', $encoding . '//IGNORE', $str); |
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| 452 | return $str; |
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| 453 | } elseif ($encoding === 'iso-8859-1' && function_exists('mb_convert_encoding')) { |
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| 454 | $str = mb_convert_encoding($str, 'ISO-8859-1', 'UTF-8'); |
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| 455 | return $str; |
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| 456 | } |
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| 457 | trigger_error('Encoding not supported', E_USER_ERROR); |
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| 458 | // You might be tempted to assume that the ASCII representation |
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| 459 | // might be OK, however, this is *not* universally true over all |
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| 460 | // encodings. So we take the conservative route here, rather |
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| 461 | // than forcibly turn on %Core.EscapeNonASCIICharacters |
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| 462 | } |
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| 463 | |||
| 464 | /** |
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| 465 | * Lossless (character-wise) conversion of HTML to ASCII |
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| 466 | * @param string $str UTF-8 string to be converted to ASCII |
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| 467 | * @return string ASCII encoded string with non-ASCII character entity-ized |
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| 468 | * @warning Adapted from MediaWiki, claiming fair use: this is a common |
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| 469 | * algorithm. If you disagree with this license fudgery, |
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| 470 | * implement it yourself. |
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| 471 | * @note Uses decimal numeric entities since they are best supported. |
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| 472 | * @note This is a DUMB function: it has no concept of keeping |
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| 473 | * character entities that the projected character encoding |
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| 474 | * can allow. We could possibly implement a smart version |
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| 475 | * but that would require it to also know which Unicode |
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| 476 | * codepoints the charset supported (not an easy task). |
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| 477 | * @note Sort of with cleanUTF8() but it assumes that $str is |
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| 478 | * well-formed UTF-8 |
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| 479 | */ |
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| 480 | public static function convertToASCIIDumbLossless($str) |
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| 510 | } |
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| 511 | |||
| 512 | /** No bugs detected in iconv. */ |
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| 513 | const ICONV_OK = 0; |
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| 514 | |||
| 515 | /** Iconv truncates output if converting from UTF-8 to another |
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| 516 | * character set with //IGNORE, and a non-encodable character is found */ |
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| 517 | const ICONV_TRUNCATES = 1; |
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| 518 | |||
| 519 | /** Iconv does not support //IGNORE, making it unusable for |
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| 520 | * transcoding purposes */ |
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| 521 | const ICONV_UNUSABLE = 2; |
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| 522 | |||
| 523 | /** |
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| 524 | * glibc iconv has a known bug where it doesn't handle the magic |
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| 525 | * //IGNORE stanza correctly. In particular, rather than ignore |
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| 526 | * characters, it will return an EILSEQ after consuming some number |
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| 527 | * of characters, and expect you to restart iconv as if it were |
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| 528 | * an E2BIG. Old versions of PHP did not respect the errno, and |
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| 529 | * returned the fragment, so as a result you would see iconv |
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| 530 | * mysteriously truncating output. We can work around this by |
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| 531 | * manually chopping our input into segments of about 8000 |
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| 532 | * characters, as long as PHP ignores the error code. If PHP starts |
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| 533 | * paying attention to the error code, iconv becomes unusable. |
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| 534 | * |
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| 535 | * @return int Error code indicating severity of bug. |
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| 536 | */ |
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| 537 | public static function testIconvTruncateBug() |
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| 538 | { |
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| 539 | static $code = null; |
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| 540 | if ($code === null) { |
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| 541 | // better not use iconv, otherwise infinite loop! |
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| 542 | $r = self::unsafeIconv('utf-8', 'ascii//IGNORE', "\xCE\xB1" . str_repeat('a', 9000)); |
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| 543 | if ($r === false) { |
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| 544 | $code = self::ICONV_UNUSABLE; |
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| 545 | } elseif (($c = strlen($r)) < 9000) { |
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| 546 | $code = self::ICONV_TRUNCATES; |
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| 547 | } elseif ($c > 9000) { |
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| 548 | trigger_error( |
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| 549 | 'Your copy of iconv is extremely buggy. Please notify HTML Purifier maintainers: ' . |
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| 550 | 'include your iconv version as per phpversion()', |
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| 551 | E_USER_ERROR |
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| 552 | ); |
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| 553 | } else { |
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| 554 | $code = self::ICONV_OK; |
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| 555 | } |
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| 556 | } |
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| 557 | return $code; |
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| 558 | } |
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| 559 | |||
| 560 | /** |
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| 561 | * This expensive function tests whether or not a given character |
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| 562 | * encoding supports ASCII. 7/8-bit encodings like Shift_JIS will |
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| 563 | * fail this test, and require special processing. Variable width |
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| 564 | * encodings shouldn't ever fail. |
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| 565 | * |
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| 566 | * @param string $encoding Encoding name to test, as per iconv format |
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| 567 | * @param bool $bypass Whether or not to bypass the precompiled arrays. |
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| 568 | * @return Array of UTF-8 characters to their corresponding ASCII, |
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| 569 | * which can be used to "undo" any overzealous iconv action. |
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| 570 | */ |
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| 571 | public static function testEncodingSupportsASCII($encoding, $bypass = false) |
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| 614 | } |
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| 615 | } |
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| 616 | |||
| 617 | // vim: et sw=4 sts=4 |
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| 618 |
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