diff options
Diffstat (limited to 'library/ajaxchat/chat/lib/class/AJAXChatEncoding.php')
| -rw-r--r-- | library/ajaxchat/chat/lib/class/AJAXChatEncoding.php | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/library/ajaxchat/chat/lib/class/AJAXChatEncoding.php b/library/ajaxchat/chat/lib/class/AJAXChatEncoding.php new file mode 100644 index 000000000..96b2482c7 --- /dev/null +++ b/library/ajaxchat/chat/lib/class/AJAXChatEncoding.php @@ -0,0 +1,138 @@ +<?php +/* + * @package AJAX_Chat + * @author Sebastian Tschan + * @copyright (c) Sebastian Tschan + * @license Modified MIT License + * @link https://blueimp.net/ajax/ + */ + +// Class to provide static encoding methods +class AJAXChatEncoding { + + // Helper function to store special chars as we cannot use static class members in PHP4: + public static function getSpecialChars() { + static $specialChars; + if(!$specialChars) { + // As ' is not supported by IE, we use ' as replacement for "'": + $specialChars = array('&'=>'&', '<'=>'<', '>'=>'>', "'"=>''', '"'=>'"'); + } + return $specialChars; + } + + // Helper function to store Regular expression for NO-WS-CTL as we cannot use static class members in PHP4: + public static function getRegExp_NO_WS_CTL() { + static $regExp_NO_WS_CTL; + if(!$regExp_NO_WS_CTL) { + // Regular expression for NO-WS-CTL, non-whitespace control characters (RFC 2822), decimal 1–8, 11–12, 14–31, and 127: + $regExp_NO_WS_CTL = '/[\x0\x1\x2\x3\x4\x5\x6\x7\x8\xB\xC\xE\xF\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1A\x1B\x1C\x1D\x1E\x1F\x7F]/'; + } + return $regExp_NO_WS_CTL; + } + + public static function convertEncoding($str, $charsetFrom, $charsetTo) { + if(function_exists('mb_convert_encoding')) { + return mb_convert_encoding($str, $charsetTo, $charsetFrom); + } + if(function_exists('iconv')) { + return iconv($charsetFrom, $charsetTo, $str); + } + if(($charsetFrom == 'UTF-8') && ($charsetTo == 'ISO-8859-1')) { + return utf8_decode($str); + } + if(($charsetFrom == 'ISO-8859-1') && ($charsetTo == 'UTF-8')) { + return utf8_encode($str); + } + return $str; + } + + public static function htmlEncode($str, $contentCharset='UTF-8') { + switch($contentCharset) { + case 'UTF-8': + // Encode only special chars (&, <, >, ', ") as entities: + return AJAXChatEncoding::encodeSpecialChars($str); + break; + case 'ISO-8859-1': + case 'ISO-8859-15': + // Encode special chars and all extended characters above ISO-8859-1 charset as entities, then convert to content charset: + return AJAXChatEncoding::convertEncoding(AJAXChatEncoding::encodeEntities($str, 'UTF-8', array( + 0x26, 0x26, 0, 0xFFFF, // & + 0x3C, 0x3C, 0, 0xFFFF, // < + 0x3E, 0x3E, 0, 0xFFFF, // > + 0x27, 0x27, 0, 0xFFFF, // ' + 0x22, 0x22, 0, 0xFFFF, // " + 0x100, 0x2FFFF, 0, 0xFFFF // above ISO-8859-1 + )), 'UTF-8', $contentCharset); + break; + default: + // Encode special chars and all characters above ASCII charset as entities, then convert to content charset: + return AJAXChatEncoding::convertEncoding(AJAXChatEncoding::encodeEntities($str, 'UTF-8', array( + 0x26, 0x26, 0, 0xFFFF, // & + 0x3C, 0x3C, 0, 0xFFFF, // < + 0x3E, 0x3E, 0, 0xFFFF, // > + 0x27, 0x27, 0, 0xFFFF, // ' + 0x22, 0x22, 0, 0xFFFF, // " + 0x80, 0x2FFFF, 0, 0xFFFF // above ASCII + )), 'UTF-8', $contentCharset); + } + } + + public static function encodeSpecialChars($str) { + return strtr($str, AJAXChatEncoding::getSpecialChars()); + } + + public static function decodeSpecialChars($str) { + return strtr($str, array_flip(AJAXChatEncoding::getSpecialChars())); + } + + public static function encodeEntities($str, $encoding='UTF-8', $convmap=null) { + if($convmap && function_exists('mb_encode_numericentity')) { + return mb_encode_numericentity($str, $convmap, $encoding); + } + return htmlentities($str, ENT_QUOTES, $encoding); + } + + public static function decodeEntities($str, $encoding='UTF-8', $htmlEntitiesMap=null) { + // Due to PHP bug #25670, html_entity_decode does not work with UTF-8 for PHP versions < 5: + if(function_exists('html_entity_decode') && version_compare(phpversion(), 5, '>=')) { + // Replace numeric and literal entities: + $str = html_entity_decode($str, ENT_QUOTES, $encoding); + // Replace additional literal HTML entities if an HTML entities map is given: + if($htmlEntitiesMap) { + $str = strtr($str, $htmlEntitiesMap); + } + } else { + // Replace numeric entities: + $str = preg_replace('~&#([0-9]+);~e', 'AJAXChatEncoding::unicodeChar("\\1")', $str); + $str = preg_replace('~&#x([0-9a-f]+);~ei', 'AJAXChatEncoding::unicodeChar(hexdec("\\1"))', $str); + // Replace literal entities: + $htmlEntitiesMap = $htmlEntitiesMap ? $htmlEntitiesMap : array_flip(get_html_translation_table(HTML_ENTITIES, ENT_QUOTES)); + $str = strtr($str, $htmlEntitiesMap); + } + return $str; + } + + public static function unicodeChar($c) { + if($c <= 0x7F) { + return chr($c); + } else if($c <= 0x7FF) { + return chr(0xC0 | $c >> 6) . chr(0x80 | $c & 0x3F); + } else if($c <= 0xFFFF) { + return chr(0xE0 | $c >> 12) . chr(0x80 | $c >> 6 & 0x3F) + . chr(0x80 | $c & 0x3F); + } else if($c <= 0x10FFFF) { + return chr(0xF0 | $c >> 18) . chr(0x80 | $c >> 12 & 0x3F) + . chr(0x80 | $c >> 6 & 0x3F) + . chr(0x80 | $c & 0x3F); + } else { + return null; + } + } + + public static function removeUnsafeCharacters($str) { + // Remove NO-WS-CTL, non-whitespace control characters (RFC 2822), decimal 1–8, 11–12, 14–31, and 127: + return preg_replace(AJAXChatEncoding::getRegExp_NO_WS_CTL(), '', $str); + } + +} +?>
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