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- <?php
- /**
- +-----------------------------------------------------------------------+
- | This file is part of the Roundcube Webmail client |
- | Copyright (C) 2005-2012, The Roundcube Dev Team |
- | Copyright (C) 2011-2012, Kolab Systems AG |
- | Copyright (C) 2000 Edmund Grimley Evans <edmundo@rano.org> |
- | |
- | Licensed under the GNU General Public License version 3 or |
- | any later version with exceptions for skins & plugins. |
- | See the README file for a full license statement. |
- | |
- | PURPOSE: |
- | Provide charset conversion functionality |
- +-----------------------------------------------------------------------+
- | Author: Thomas Bruederli <roundcube@gmail.com> |
- | Author: Aleksander Machniak <alec@alec.pl> |
- +-----------------------------------------------------------------------+
- */
- /**
- * Character sets conversion functionality
- *
- * @package Framework
- * @subpackage Core
- * @author Thomas Bruederli <roundcube@gmail.com>
- * @author Aleksander Machniak <alec@alec.pl>
- * @author Edmund Grimley Evans <edmundo@rano.org>
- */
- class rcube_charset
- {
- // Aliases: some of them from HTML5 spec.
- static public $aliases = array(
- 'USASCII' => 'WINDOWS-1252',
- 'ANSIX31101983' => 'WINDOWS-1252',
- 'ANSIX341968' => 'WINDOWS-1252',
- 'UNKNOWN8BIT' => 'ISO-8859-15',
- 'UNKNOWN' => 'ISO-8859-15',
- 'USERDEFINED' => 'ISO-8859-15',
- 'KSC56011987' => 'EUC-KR',
- 'GB2312' => 'GBK',
- 'GB231280' => 'GBK',
- 'UNICODE' => 'UTF-8',
- 'UTF7IMAP' => 'UTF7-IMAP',
- 'TIS620' => 'WINDOWS-874',
- 'ISO88599' => 'WINDOWS-1254',
- 'ISO885911' => 'WINDOWS-874',
- 'MACROMAN' => 'MACINTOSH',
- '77' => 'MAC',
- '128' => 'SHIFT-JIS',
- '129' => 'CP949',
- '130' => 'CP1361',
- '134' => 'GBK',
- '136' => 'BIG5',
- '161' => 'WINDOWS-1253',
- '162' => 'WINDOWS-1254',
- '163' => 'WINDOWS-1258',
- '177' => 'WINDOWS-1255',
- '178' => 'WINDOWS-1256',
- '186' => 'WINDOWS-1257',
- '204' => 'WINDOWS-1251',
- '222' => 'WINDOWS-874',
- '238' => 'WINDOWS-1250',
- 'MS950' => 'CP950',
- 'WINDOWS949' => 'UHC',
- );
- /**
- * Windows codepages
- *
- * @var array
- */
- static public $windows_codepages = array(
- 37 => 'IBM037', // IBM EBCDIC US-Canada
- 437 => 'IBM437', // OEM United States
- 500 => 'IBM500', // IBM EBCDIC International
- 708 => 'ASMO-708', // Arabic (ASMO 708)
- 720 => 'DOS-720', // Arabic (Transparent ASMO); Arabic (DOS)
- 737 => 'IBM737', // OEM Greek (formerly 437G); Greek (DOS)
- 775 => 'IBM775', // OEM Baltic; Baltic (DOS)
- 850 => 'IBM850', // OEM Multilingual Latin 1; Western European (DOS)
- 852 => 'IBM852', // OEM Latin 2; Central European (DOS)
- 855 => 'IBM855', // OEM Cyrillic (primarily Russian)
- 857 => 'IBM857', // OEM Turkish; Turkish (DOS)
- 858 => 'IBM00858', // OEM Multilingual Latin 1 + Euro symbol
- 860 => 'IBM860', // OEM Portuguese; Portuguese (DOS)
- 861 => 'IBM861', // OEM Icelandic; Icelandic (DOS)
- 862 => 'DOS-862', // OEM Hebrew; Hebrew (DOS)
- 863 => 'IBM863', // OEM French Canadian; French Canadian (DOS)
- 864 => 'IBM864', // OEM Arabic; Arabic (864)
- 865 => 'IBM865', // OEM Nordic; Nordic (DOS)
- 866 => 'cp866', // OEM Russian; Cyrillic (DOS)
- 869 => 'IBM869', // OEM Modern Greek; Greek, Modern (DOS)
- 870 => 'IBM870', // IBM EBCDIC Multilingual/ROECE (Latin 2); IBM EBCDIC Multilingual Latin 2
- 874 => 'windows-874', // ANSI/OEM Thai (ISO 8859-11); Thai (Windows)
- 875 => 'cp875', // IBM EBCDIC Greek Modern
- 932 => 'shift_jis', // ANSI/OEM Japanese; Japanese (Shift-JIS)
- 936 => 'gb2312', // ANSI/OEM Simplified Chinese (PRC, Singapore); Chinese Simplified (GB2312)
- 950 => 'big5', // ANSI/OEM Traditional Chinese (Taiwan; Hong Kong SAR, PRC); Chinese Traditional (Big5)
- 1026 => 'IBM1026', // IBM EBCDIC Turkish (Latin 5)
- 1047 => 'IBM01047', // IBM EBCDIC Latin 1/Open System
- 1140 => 'IBM01140', // IBM EBCDIC US-Canada (037 + Euro symbol); IBM EBCDIC (US-Canada-Euro)
- 1141 => 'IBM01141', // IBM EBCDIC Germany (20273 + Euro symbol); IBM EBCDIC (Germany-Euro)
- 1142 => 'IBM01142', // IBM EBCDIC Denmark-Norway (20277 + Euro symbol); IBM EBCDIC (Denmark-Norway-Euro)
- 1143 => 'IBM01143', // IBM EBCDIC Finland-Sweden (20278 + Euro symbol); IBM EBCDIC (Finland-Sweden-Euro)
- 1144 => 'IBM01144', // IBM EBCDIC Italy (20280 + Euro symbol); IBM EBCDIC (Italy-Euro)
- 1145 => 'IBM01145', // IBM EBCDIC Latin America-Spain (20284 + Euro symbol); IBM EBCDIC (Spain-Euro)
- 1146 => 'IBM01146', // IBM EBCDIC United Kingdom (20285 + Euro symbol); IBM EBCDIC (UK-Euro)
- 1147 => 'IBM01147', // IBM EBCDIC France (20297 + Euro symbol); IBM EBCDIC (France-Euro)
- 1148 => 'IBM01148', // IBM EBCDIC International (500 + Euro symbol); IBM EBCDIC (International-Euro)
- 1149 => 'IBM01149', // IBM EBCDIC Icelandic (20871 + Euro symbol); IBM EBCDIC (Icelandic-Euro)
- 1200 => 'UTF-16', // Unicode UTF-16, little endian byte order (BMP of ISO 10646); available only to managed applications
- 1201 => 'UTF-16BE', // Unicode UTF-16, big endian byte order; available only to managed applications
- 1250 => 'windows-1250', // ANSI Central European; Central European (Windows)
- 1251 => 'windows-1251', // ANSI Cyrillic; Cyrillic (Windows)
- 1252 => 'windows-1252', // ANSI Latin 1; Western European (Windows)
- 1253 => 'windows-1253', // ANSI Greek; Greek (Windows)
- 1254 => 'windows-1254', // ANSI Turkish; Turkish (Windows)
- 1255 => 'windows-1255', // ANSI Hebrew; Hebrew (Windows)
- 1256 => 'windows-1256', // ANSI Arabic; Arabic (Windows)
- 1257 => 'windows-1257', // ANSI Baltic; Baltic (Windows)
- 1258 => 'windows-1258', // ANSI/OEM Vietnamese; Vietnamese (Windows)
- 10000 => 'macintosh', // MAC Roman; Western European (Mac)
- 12000 => 'UTF-32', // Unicode UTF-32, little endian byte order; available only to managed applications
- 12001 => 'UTF-32BE', // Unicode UTF-32, big endian byte order; available only to managed applications
- 20127 => 'US-ASCII', // US-ASCII (7-bit)
- 20273 => 'IBM273', // IBM EBCDIC Germany
- 20277 => 'IBM277', // IBM EBCDIC Denmark-Norway
- 20278 => 'IBM278', // IBM EBCDIC Finland-Sweden
- 20280 => 'IBM280', // IBM EBCDIC Italy
- 20284 => 'IBM284', // IBM EBCDIC Latin America-Spain
- 20285 => 'IBM285', // IBM EBCDIC United Kingdom
- 20290 => 'IBM290', // IBM EBCDIC Japanese Katakana Extended
- 20297 => 'IBM297', // IBM EBCDIC France
- 20420 => 'IBM420', // IBM EBCDIC Arabic
- 20423 => 'IBM423', // IBM EBCDIC Greek
- 20424 => 'IBM424', // IBM EBCDIC Hebrew
- 20838 => 'IBM-Thai', // IBM EBCDIC Thai
- 20866 => 'koi8-r', // Russian (KOI8-R); Cyrillic (KOI8-R)
- 20871 => 'IBM871', // IBM EBCDIC Icelandic
- 20880 => 'IBM880', // IBM EBCDIC Cyrillic Russian
- 20905 => 'IBM905', // IBM EBCDIC Turkish
- 20924 => 'IBM00924', // IBM EBCDIC Latin 1/Open System (1047 + Euro symbol)
- 20932 => 'EUC-JP', // Japanese (JIS 0208-1990 and 0212-1990)
- 20936 => 'cp20936', // Simplified Chinese (GB2312); Chinese Simplified (GB2312-80)
- 20949 => 'cp20949', // Korean Wansung
- 21025 => 'cp1025', // IBM EBCDIC Cyrillic Serbian-Bulgarian
- 21866 => 'koi8-u', // Ukrainian (KOI8-U); Cyrillic (KOI8-U)
- 28591 => 'iso-8859-1', // ISO 8859-1 Latin 1; Western European (ISO)
- 28592 => 'iso-8859-2', // ISO 8859-2 Central European; Central European (ISO)
- 28593 => 'iso-8859-3', // ISO 8859-3 Latin 3
- 28594 => 'iso-8859-4', // ISO 8859-4 Baltic
- 28595 => 'iso-8859-5', // ISO 8859-5 Cyrillic
- 28596 => 'iso-8859-6', // ISO 8859-6 Arabic
- 28597 => 'iso-8859-7', // ISO 8859-7 Greek
- 28598 => 'iso-8859-8', // ISO 8859-8 Hebrew; Hebrew (ISO-Visual)
- 28599 => 'iso-8859-9', // ISO 8859-9 Turkish
- 28603 => 'iso-8859-13', // ISO 8859-13 Estonian
- 28605 => 'iso-8859-15', // ISO 8859-15 Latin 9
- 38598 => 'iso-8859-8-i', // ISO 8859-8 Hebrew; Hebrew (ISO-Logical)
- 50220 => 'iso-2022-jp', // ISO 2022 Japanese with no halfwidth Katakana; Japanese (JIS)
- 50221 => 'csISO2022JP', // ISO 2022 Japanese with halfwidth Katakana; Japanese (JIS-Allow 1 byte Kana)
- 50222 => 'iso-2022-jp', // ISO 2022 Japanese JIS X 0201-1989; Japanese (JIS-Allow 1 byte Kana - SO/SI)
- 50225 => 'iso-2022-kr', // ISO 2022 Korean
- 51932 => 'EUC-JP', // EUC Japanese
- 51936 => 'EUC-CN', // EUC Simplified Chinese; Chinese Simplified (EUC)
- 51949 => 'EUC-KR', // EUC Korean
- 52936 => 'hz-gb-2312', // HZ-GB2312 Simplified Chinese; Chinese Simplified (HZ)
- 54936 => 'GB18030', // Windows XP and later: GB18030 Simplified Chinese (4 byte); Chinese Simplified (GB18030)
- 65000 => 'UTF-7',
- 65001 => 'UTF-8',
- );
- /**
- * Catch an error and throw an exception.
- *
- * @param int $errno Level of the error
- * @param string $errstr Error message
- */
- public static function error_handler($errno, $errstr)
- {
- throw new ErrorException($errstr, 0, $errno);
- }
- /**
- * Parse and validate charset name string (see #1485758).
- * Sometimes charset string is malformed, there are also charset aliases
- * but we need strict names for charset conversion (specially utf8 class)
- *
- * @param string $input Input charset name
- *
- * @return string The validated charset name
- */
- public static function parse_charset($input)
- {
- static $charsets = array();
- $charset = strtoupper($input);
- if (isset($charsets[$input])) {
- return $charsets[$input];
- }
- $charset = preg_replace(array(
- '/^[^0-9A-Z]+/', // e.g. _ISO-8859-JP$SIO
- '/\$.*$/', // e.g. _ISO-8859-JP$SIO
- '/UNICODE-1-1-*/', // RFC1641/1642
- '/^X-/', // X- prefix (e.g. X-ROMAN8 => ROMAN8)
- ), '', $charset);
- if ($charset == 'BINARY') {
- return $charsets[$input] = null;
- }
- // allow A-Z and 0-9 only
- $str = preg_replace('/[^A-Z0-9]/', '', $charset);
- if (isset(self::$aliases[$str])) {
- $result = self::$aliases[$str];
- }
- // UTF
- else if (preg_match('/U[A-Z][A-Z](7|8|16|32)(BE|LE)*/', $str, $m)) {
- $result = 'UTF-' . $m[1] . $m[2];
- }
- // ISO-8859
- else if (preg_match('/ISO8859([0-9]{0,2})/', $str, $m)) {
- $iso = 'ISO-8859-' . ($m[1] ?: 1);
- // some clients sends windows-1252 text as latin1,
- // it is safe to use windows-1252 for all latin1
- $result = $iso == 'ISO-8859-1' ? 'WINDOWS-1252' : $iso;
- }
- // handle broken charset names e.g. WINDOWS-1250HTTP-EQUIVCONTENT-TYPE
- else if (preg_match('/(WIN|WINDOWS)([0-9]+)/', $str, $m)) {
- $result = 'WINDOWS-' . $m[2];
- }
- // LATIN
- else if (preg_match('/LATIN(.*)/', $str, $m)) {
- $aliases = array('2' => 2, '3' => 3, '4' => 4, '5' => 9, '6' => 10,
- '7' => 13, '8' => 14, '9' => 15, '10' => 16,
- 'ARABIC' => 6, 'CYRILLIC' => 5, 'GREEK' => 7, 'GREEK1' => 7, 'HEBREW' => 8
- );
- // some clients sends windows-1252 text as latin1,
- // it is safe to use windows-1252 for all latin1
- if ($m[1] == 1) {
- $result = 'WINDOWS-1252';
- }
- // if iconv is not supported we need ISO labels, it's also safe for iconv
- else if (!empty($aliases[$m[1]])) {
- $result = 'ISO-8859-'.$aliases[$m[1]];
- }
- // iconv requires conversion of e.g. LATIN-1 to LATIN1
- else {
- $result = $str;
- }
- }
- else {
- $result = $charset;
- }
- $charsets[$input] = $result;
- return $result;
- }
- /**
- * Convert a string from one charset to another.
- * Uses mbstring and iconv functions if possible
- *
- * @param string $str Input string
- * @param string $from Suspected charset of the input string
- * @param string $to Target charset to convert to; defaults to RCUBE_CHARSET
- *
- * @return string Converted string
- */
- public static function convert($str, $from, $to = null)
- {
- static $iconv_options = null;
- static $mbstring_sc = null;
- $to = empty($to) ? RCUBE_CHARSET : strtoupper($to);
- $from = self::parse_charset($from);
- // It is a common case when UTF-16 charset is used with US-ASCII content (#1488654)
- // In that case we can just skip the conversion (use UTF-8)
- if ($from == 'UTF-16' && !preg_match('/[^\x00-\x7F]/', $str)) {
- $from = 'UTF-8';
- }
- if ($from == $to || empty($str) || empty($from)) {
- return $str;
- }
- if ($iconv_options === null) {
- if (function_exists('iconv')) {
- // ignore characters not available in output charset
- $iconv_options = '//IGNORE';
- if (iconv('', $iconv_options, '') === false) {
- // iconv implementation does not support options
- $iconv_options = '';
- }
- }
- else {
- $iconv_options = false;
- }
- }
- // convert charset using iconv module
- if ($iconv_options !== false && $from != 'UTF7-IMAP' && $to != 'UTF7-IMAP'
- && $from !== 'ISO-2022-JP'
- ) {
- // throw an exception if iconv reports an illegal character in input
- // it means that input string has been truncated
- set_error_handler(array('rcube_charset', 'error_handler'), E_NOTICE);
- try {
- $out = iconv($from, $to . $iconv_options, $str);
- }
- catch (ErrorException $e) {
- $out = false;
- }
- restore_error_handler();
- if ($out !== false) {
- return $out;
- }
- }
- if ($mbstring_sc === null) {
- $mbstring_sc = extension_loaded('mbstring') ? mb_substitute_character() : false;
- }
- // convert charset using mbstring module
- if ($mbstring_sc !== false) {
- $aliases = array(
- 'WINDOWS-1257' => 'ISO-8859-13',
- 'US-ASCII' => 'ASCII',
- 'ISO-2022-JP' => 'ISO-2022-JP-MS',
- );
- $mb_from = $aliases[$from] ?: $from;
- $mb_to = $aliases[$to] ?: $to;
- // Do the same as //IGNORE with iconv
- mb_substitute_character('none');
- // throw an exception if mbstring reports an illegal character in input
- // using mb_check_encoding() is much slower
- set_error_handler(array('rcube_charset', 'error_handler'), E_WARNING);
- try {
- $out = mb_convert_encoding($str, $mb_to, $mb_from);
- }
- catch (ErrorException $e) {
- $out = false;
- }
- restore_error_handler();
- mb_substitute_character($mbstring_sc);
- if ($out !== false) {
- return $out;
- }
- }
- // convert charset using bundled classes/functions
- if ($to == 'UTF-8') {
- if ($from == 'UTF7-IMAP') {
- if ($out = self::utf7imap_to_utf8($str)) {
- return $out;
- }
- }
- else if ($from == 'UTF-7') {
- if ($out = self::utf7_to_utf8($str)) {
- return $out;
- }
- }
- }
- // encode string for output
- if ($from == 'UTF-8') {
- // @TODO: we need a function for UTF-7 (RFC2152) conversion
- if ($to == 'UTF7-IMAP' || $to == 'UTF-7') {
- if ($out = self::utf8_to_utf7imap($str)) {
- return $out;
- }
- }
- }
- if (!isset($out)) {
- trigger_error("No suitable function found for '$from' to '$to' conversion");
- }
- // return original string
- return $str;
- }
- /**
- * Converts string from standard UTF-7 (RFC 2152) to UTF-8.
- *
- * @param string $str Input string (UTF-7)
- *
- * @return string Converted string (UTF-8)
- */
- public static function utf7_to_utf8($str)
- {
- $Index_64 = array(
- 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
- 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
- 0,0,0,0, 0,0,0,0, 0,0,0,1, 0,0,0,0,
- 1,1,1,1, 1,1,1,1, 1,1,0,0, 0,0,0,0,
- 0,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1,
- 1,1,1,1, 1,1,1,1, 1,1,1,0, 0,0,0,0,
- 0,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1,
- 1,1,1,1, 1,1,1,1, 1,1,1,0, 0,0,0,0,
- );
- $u7len = strlen($str);
- $str = strval($str);
- $res = '';
- for ($i=0; $u7len > 0; $i++, $u7len--) {
- $u7 = $str[$i];
- if ($u7 == '+') {
- $i++;
- $u7len--;
- $ch = '';
- for (; $u7len > 0; $i++, $u7len--) {
- $u7 = $str[$i];
- if (!$Index_64[ord($u7)]) {
- break;
- }
- $ch .= $u7;
- }
- if ($ch == '') {
- if ($u7 == '-') {
- $res .= '+';
- }
- continue;
- }
- $res .= self::utf16_to_utf8(base64_decode($ch));
- }
- else {
- $res .= $u7;
- }
- }
- return $res;
- }
- /**
- * Converts string from UTF-16 to UTF-8 (helper for utf-7 to utf-8 conversion)
- *
- * @param string $str Input string
- *
- * @return string The converted string
- */
- public static function utf16_to_utf8($str)
- {
- $len = strlen($str);
- $dec = '';
- for ($i = 0; $i < $len; $i += 2) {
- $c = ord($str[$i]) << 8 | ord($str[$i + 1]);
- if ($c >= 0x0001 && $c <= 0x007F) {
- $dec .= chr($c);
- }
- else if ($c > 0x07FF) {
- $dec .= chr(0xE0 | (($c >> 12) & 0x0F));
- $dec .= chr(0x80 | (($c >> 6) & 0x3F));
- $dec .= chr(0x80 | (($c >> 0) & 0x3F));
- }
- else {
- $dec .= chr(0xC0 | (($c >> 6) & 0x1F));
- $dec .= chr(0x80 | (($c >> 0) & 0x3F));
- }
- }
- return $dec;
- }
- /**
- * Convert the data ($str) from RFC 2060's UTF-7 to UTF-8.
- * If input data is invalid, return the original input string.
- * RFC 2060 obviously intends the encoding to be unique (see
- * point 5 in section 5.1.3), so we reject any non-canonical
- * form, such as &ACY- (instead of &-) or &AMA-&AMA- (instead
- * of &AMAAwA-).
- *
- * Translated from C to PHP by Thomas Bruederli <roundcube@gmail.com>
- *
- * @param string $str Input string (UTF7-IMAP)
- *
- * @return string Output string (UTF-8)
- */
- public static function utf7imap_to_utf8($str)
- {
- $Index_64 = array(
- -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
- -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
- -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, 63,-1,-1,-1,
- 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1,
- -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14,
- 15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
- -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
- 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
- );
- $u7len = strlen($str);
- $str = strval($str);
- $p = '';
- $err = '';
- for ($i=0; $u7len > 0; $i++, $u7len--) {
- $u7 = $str[$i];
- if ($u7 == '&') {
- $i++;
- $u7len--;
- $u7 = $str[$i];
- if ($u7len && $u7 == '-') {
- $p .= '&';
- continue;
- }
- $ch = 0;
- $k = 10;
- for (; $u7len > 0; $i++, $u7len--) {
- $u7 = $str[$i];
- if ((ord($u7) & 0x80) || ($b = $Index_64[ord($u7)]) == -1) {
- break;
- }
- if ($k > 0) {
- $ch |= $b << $k;
- $k -= 6;
- }
- else {
- $ch |= $b >> (-$k);
- if ($ch < 0x80) {
- // Printable US-ASCII
- if (0x20 <= $ch && $ch < 0x7f) {
- return $err;
- }
- $p .= chr($ch);
- }
- else if ($ch < 0x800) {
- $p .= chr(0xc0 | ($ch >> 6));
- $p .= chr(0x80 | ($ch & 0x3f));
- }
- else {
- $p .= chr(0xe0 | ($ch >> 12));
- $p .= chr(0x80 | (($ch >> 6) & 0x3f));
- $p .= chr(0x80 | ($ch & 0x3f));
- }
- $ch = ($b << (16 + $k)) & 0xffff;
- $k += 10;
- }
- }
- // Non-zero or too many extra bits
- if ($ch || $k < 6) {
- return $err;
- }
- // BASE64 not properly terminated
- if (!$u7len || $u7 != '-') {
- return $err;
- }
- // Adjacent BASE64 sections
- if ($u7len > 2 && $str[$i+1] == '&' && $str[$i+2] != '-') {
- return $err;
- }
- }
- // Not printable US-ASCII
- else if (ord($u7) < 0x20 || ord($u7) >= 0x7f) {
- return $err;
- }
- else {
- $p .= $u7;
- }
- }
- return $p;
- }
- /**
- * Convert the data ($str) from UTF-8 to RFC 2060's UTF-7.
- * Unicode characters above U+FFFF are replaced by U+FFFE.
- * If input data is invalid, return an empty string.
- *
- * Translated from C to PHP by Thomas Bruederli <roundcube@gmail.com>
- *
- * @param string $str Input string (UTF-8)
- *
- * @return string Output string (UTF7-IMAP)
- */
- public static function utf8_to_utf7imap($str)
- {
- $B64Chars = array(
- 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
- 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
- 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
- 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
- '8', '9', '+', ','
- );
- $u8len = strlen($str);
- $base64 = 0;
- $i = 0;
- $p = '';
- $err = '';
- while ($u8len) {
- $u8 = $str[$i];
- $c = ord($u8);
- if ($c < 0x80) {
- $ch = $c;
- $n = 0;
- }
- else if ($c < 0xc2) {
- return $err;
- }
- else if ($c < 0xe0) {
- $ch = $c & 0x1f;
- $n = 1;
- }
- else if ($c < 0xf0) {
- $ch = $c & 0x0f;
- $n = 2;
- }
- else if ($c < 0xf8) {
- $ch = $c & 0x07;
- $n = 3;
- }
- else if ($c < 0xfc) {
- $ch = $c & 0x03;
- $n = 4;
- }
- else if ($c < 0xfe) {
- $ch = $c & 0x01;
- $n = 5;
- }
- else {
- return $err;
- }
- $i++;
- $u8len--;
- if ($n > $u8len) {
- return $err;
- }
- for ($j=0; $j < $n; $j++) {
- $o = ord($str[$i+$j]);
- if (($o & 0xc0) != 0x80) {
- return $err;
- }
- $ch = ($ch << 6) | ($o & 0x3f);
- }
- if ($n > 1 && !($ch >> ($n * 5 + 1))) {
- return $err;
- }
- $i += $n;
- $u8len -= $n;
- if ($ch < 0x20 || $ch >= 0x7f) {
- if (!$base64) {
- $p .= '&';
- $base64 = 1;
- $b = 0;
- $k = 10;
- }
- if ($ch & ~0xffff) {
- $ch = 0xfffe;
- }
- $p .= $B64Chars[($b | $ch >> $k)];
- $k -= 6;
- for (; $k >= 0; $k -= 6) {
- $p .= $B64Chars[(($ch >> $k) & 0x3f)];
- }
- $b = ($ch << (-$k)) & 0x3f;
- $k += 16;
- }
- else {
- if ($base64) {
- if ($k > 10) {
- $p .= $B64Chars[$b];
- }
- $p .= '-';
- $base64 = 0;
- }
- $p .= chr($ch);
- if (chr($ch) == '&') {
- $p .= '-';
- }
- }
- }
- if ($base64) {
- if ($k > 10) {
- $p .= $B64Chars[$b];
- }
- $p .= '-';
- }
- return $p;
- }
- /**
- * A method to guess character set of a string.
- *
- * @param string $string String
- * @param string $failover Default result for failover
- * @param string $language User language
- *
- * @return string Charset name
- */
- public static function detect($string, $failover = null, $language = null)
- {
- if (substr($string, 0, 4) == "\0\0\xFE\xFF") return 'UTF-32BE'; // Big Endian
- if (substr($string, 0, 4) == "\xFF\xFE\0\0") return 'UTF-32LE'; // Little Endian
- if (substr($string, 0, 2) == "\xFE\xFF") return 'UTF-16BE'; // Big Endian
- if (substr($string, 0, 2) == "\xFF\xFE") return 'UTF-16LE'; // Little Endian
- if (substr($string, 0, 3) == "\xEF\xBB\xBF") return 'UTF-8';
- // heuristics
- if ($string[0] == "\0" && $string[1] == "\0" && $string[2] == "\0" && $string[3] != "\0") return 'UTF-32BE';
- if ($string[0] != "\0" && $string[1] == "\0" && $string[2] == "\0" && $string[3] == "\0") return 'UTF-32LE';
- if ($string[0] == "\0" && $string[1] != "\0" && $string[2] == "\0" && $string[3] != "\0") return 'UTF-16BE';
- if ($string[0] != "\0" && $string[1] == "\0" && $string[2] != "\0" && $string[3] == "\0") return 'UTF-16LE';
- if (empty($language)) {
- $rcube = rcube::get_instance();
- $language = $rcube->get_user_language();
- }
- // Prioritize charsets according to current language (#1485669)
- switch ($language) {
- case 'ja_JP':
- $prio = array('ISO-2022-JP', 'JIS', 'UTF-8', 'EUC-JP', 'eucJP-win', 'SJIS', 'SJIS-win');
- break;
- case 'zh_CN':
- case 'zh_TW':
- $prio = array('UTF-8', 'BIG-5', 'GB2312', 'EUC-TW');
- break;
- case 'ko_KR':
- $prio = array('UTF-8', 'EUC-KR', 'ISO-2022-KR');
- break;
- case 'ru_RU':
- $prio = array('UTF-8', 'WINDOWS-1251', 'KOI8-R');
- break;
- case 'tr_TR':
- $prio = array('UTF-8', 'ISO-8859-9', 'WINDOWS-1254');
- break;
- }
- // mb_detect_encoding() is not reliable for some charsets (#1490135)
- // use mb_check_encoding() to make charset priority lists really working
- if ($prio && function_exists('mb_check_encoding')) {
- foreach ($prio as $encoding) {
- if (mb_check_encoding($string, $encoding)) {
- return $encoding;
- }
- }
- }
- if (function_exists('mb_detect_encoding')) {
- if (!$prio) {
- $prio = array('UTF-8', 'SJIS', 'GB2312',
- 'ISO-8859-1', 'ISO-8859-2', 'ISO-8859-3', 'ISO-8859-4',
- 'ISO-8859-5', 'ISO-8859-6', 'ISO-8859-7', 'ISO-8859-8', 'ISO-8859-9',
- 'ISO-8859-10', 'ISO-8859-13', 'ISO-8859-14', 'ISO-8859-15', 'ISO-8859-16',
- 'WINDOWS-1252', 'WINDOWS-1251', 'EUC-JP', 'EUC-TW', 'KOI8-R', 'BIG-5',
- 'ISO-2022-KR', 'ISO-2022-JP',
- );
- }
- $encodings = array_unique(array_merge($prio, mb_list_encodings()));
- if ($encoding = mb_detect_encoding($string, $encodings)) {
- return $encoding;
- }
- }
- // No match, check for UTF-8
- // from http://w3.org/International/questions/qa-forms-utf-8.html
- if (preg_match('/\A(
- [\x09\x0A\x0D\x20-\x7E]
- | [\xC2-\xDF][\x80-\xBF]
- | \xE0[\xA0-\xBF][\x80-\xBF]
- | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}
- | \xED[\x80-\x9F][\x80-\xBF]
- | \xF0[\x90-\xBF][\x80-\xBF]{2}
- | [\xF1-\xF3][\x80-\xBF]{3}
- | \xF4[\x80-\x8F][\x80-\xBF]{2}
- )*\z/xs', substr($string, 0, 2048))
- ) {
- return 'UTF-8';
- }
- return $failover;
- }
- /**
- * Removes non-unicode characters from input.
- *
- * @param mixed $input String or array.
- *
- * @return mixed String or array
- */
- public static function clean($input)
- {
- // handle input of type array
- if (is_array($input)) {
- foreach ($input as $idx => $val) {
- $input[$idx] = self::clean($val);
- }
- return $input;
- }
- if (!is_string($input) || $input == '') {
- return $input;
- }
- // iconv/mbstring are much faster (especially with long strings)
- if (function_exists('mb_convert_encoding')) {
- $msch = mb_substitute_character();
- mb_substitute_character('none');
- $res = mb_convert_encoding($input, 'UTF-8', 'UTF-8');
- mb_substitute_character($msch);
- if ($res !== false) {
- return $res;
- }
- }
- if (function_exists('iconv')) {
- if (($res = @iconv('UTF-8', 'UTF-8//IGNORE', $input)) !== false) {
- return $res;
- }
- }
- $seq = '';
- $out = '';
- $regexp = '/^('.
- // '[\x00-\x7F]'. // UTF8-1
- '|[\xC2-\xDF][\x80-\xBF]'. // UTF8-2
- '|\xE0[\xA0-\xBF][\x80-\xBF]'. // UTF8-3
- '|[\xE1-\xEC][\x80-\xBF][\x80-\xBF]'. // UTF8-3
- '|\xED[\x80-\x9F][\x80-\xBF]'. // UTF8-3
- '|[\xEE-\xEF][\x80-\xBF][\x80-\xBF]'. // UTF8-3
- '|\xF0[\x90-\xBF][\x80-\xBF][\x80-\xBF]'. // UTF8-4
- '|[\xF1-\xF3][\x80-\xBF][\x80-\xBF][\x80-\xBF]'.// UTF8-4
- '|\xF4[\x80-\x8F][\x80-\xBF][\x80-\xBF]'. // UTF8-4
- ')$/';
- for ($i = 0, $len = strlen($input); $i < $len; $i++) {
- $chr = $input[$i];
- $ord = ord($chr);
- // 1-byte character
- if ($ord <= 0x7F) {
- if ($seq !== '') {
- $out .= preg_match($regexp, $seq) ? $seq : '';
- $seq = '';
- }
- $out .= $chr;
- }
- // first byte of multibyte sequence
- else if ($ord >= 0xC0) {
- if ($seq !== '') {
- $out .= preg_match($regexp, $seq) ? $seq : '';
- $seq = '';
- }
- $seq = $chr;
- }
- // next byte of multibyte sequence
- else if ($seq !== '') {
- $seq .= $chr;
- }
- }
- if ($seq !== '') {
- $out .= preg_match($regexp, $seq) ? $seq : '';
- }
- return $out;
- }
- }
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