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rcube_charset.php
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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 $aliases = array(
'USASCII' => 'WINDOWS-1252',
'ANSIX31101983' => 'WINDOWS-1252',
'ANSIX341968' => 'WINDOWS-1252',
'UNKNOWN8BIT' => 'ISO-8859-15',
'UNKNOWN' => 'ISO-8859-15',
'USERDEFINED' => 'ISO-8859-15',
'KSC56011987' => 'EUC-KR',
'GB2312' => 'GBK',
'GB231280' => 'GBK',
'UNICODE' => 'UTF-8',
'UTF7IMAP' => 'UTF7-IMAP',
'TIS620' => 'WINDOWS-874',
'ISO88599' => 'WINDOWS-1254',
'ISO885911' => 'WINDOWS-874',
'MACROMAN' => 'MACINTOSH',
'77' => 'MAC',
'128' => 'SHIFT-JIS',
'129' => 'CP949',
'130' => 'CP1361',
'134' => 'GBK',
'136' => 'BIG5',
'161' => 'WINDOWS-1253',
'162' => 'WINDOWS-1254',
'163' => 'WINDOWS-1258',
'177' => 'WINDOWS-1255',
'178' => 'WINDOWS-1256',
'186' => 'WINDOWS-1257',
'204' => 'WINDOWS-1251',
'222' => 'WINDOWS-874',
'238' => 'WINDOWS-1250',
'MS950' => 'CP950',
'WINDOWS949' => 'UHC',
);
/**
* Catch an error and throw an exception.
*
* @param int Level of the error
* @param string Error message
*/
public static function error_handler($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] ? $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 convertion of e.g. LATIN-1 to LATIN1
else {
$result = $str;
}
}
else {
$result = $charset;
}
$charsets[$input] = $result;
return $result;
}
/**
* Convert a string from one charset to another.
* Uses mbstring and iconv functions if possible
*
* @param string Input string
* @param string Suspected charset of the input string
* @param string Target charset to convert to; defaults to RCUBE_CHARSET
*
* @return string Converted string
*/
public static function convert($str, $from, $to = null)
{
static $iconv_options = null;
static $mbstring_list = null;
static $mbstring_sch = null;
static $conv = null;
$to = empty($to) ? RCUBE_CHARSET : $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
$iconv_options = '';
}
}
}
// convert charset using iconv module
if ($iconv_options !== null && $from != 'UTF7-IMAP' && $to != 'UTF7-IMAP') {
// 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 {
$_iconv = iconv($from, $to . $iconv_options, $str);
} catch (ErrorException $e) {
$_iconv = false;
}
restore_error_handler();
if ($_iconv !== false) {
return $_iconv;
}
}
if ($mbstring_list === null) {
if (extension_loaded('mbstring')) {
$mbstring_sch = mb_substitute_character();
$mbstring_list = mb_list_encodings();
$mbstring_list = array_map('strtoupper', $mbstring_list);
}
}
// convert charset using mbstring module
if ($mbstring_list !== null) {
$aliases['WINDOWS-1257'] = 'ISO-8859-13';
// it happens that mbstring supports ASCII but not US-ASCII
if (($from == 'US-ASCII' || $to == 'US-ASCII') && !in_array('US-ASCII', $mbstring_list)) {
$aliases['US-ASCII'] = 'ASCII';
}
$mb_from = $aliases[$from] ? $aliases[$from] : $from;
$mb_to = $aliases[$to] ? $aliases[$to] : $to;
// return if encoding found, string matches encoding and convert succeeded
if (in_array($mb_from, $mbstring_list) && in_array($mb_to, $mbstring_list)) {
if (mb_check_encoding($str, $mb_from)) {
// Do the same as //IGNORE with iconv
mb_substitute_character('none');
$out = mb_convert_encoding($str, $mb_to, $mb_from);
mb_substitute_character($mbstring_sch);
if ($out !== false) {
return $out;
}
}
}
}
// convert charset using bundled classes/functions
if ($to == 'UTF-8') {
if ($from == 'UTF7-IMAP') {
if ($_str = self::utf7imap_to_utf8($str)) {
return $_str;
}
}
else if ($from == 'UTF-7') {
if ($_str = self::utf7_to_utf8($str)) {
return $_str;
}
}
else if ($from == 'ISO-8859-1' && function_exists('utf8_encode')) {
return utf8_encode($str);
}
else if (class_exists('utf8')) {
if (!$conv) {
$conv = new utf8($from);
}
else {
$conv->loadCharset($from);
}
if ($_str = $conv->strToUtf8($str)) {
return $_str;
}
}
}
// encode string for output
if ($from == 'UTF-8') {
// @TODO: we need a function for UTF-7 (RFC2152) conversion
if ($to == 'UTF7-IMAP' || $to == 'UTF-7') {
if ($_str = self::utf8_to_utf7imap($str)) {
return $_str;
}
}
else if ($to == 'ISO-8859-1' && function_exists('utf8_decode')) {
return utf8_decode($str);
}
else if (class_exists('utf8')) {
if (!$conv) {
$conv = new utf8($to);
}
else {
$conv->loadCharset($from);
}
if ($_str = $conv->strToUtf8($str)) {
return $_str;
}
}
}
// return original string
return $str;
}
/**
* Converts string from standard UTF-7 (RFC 2152) to UTF-8.
*
* @param string Input string (UTF-7)
*
* @return string Converted string (UTF-8)
*/
public static function utf7_to_utf8($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 $res;
}
/**
* Converts string from UTF-16 to UTF-8 (helper for utf-7 to utf-8 conversion)
*
* @param string Input string
*
* @return string The converted string
*/
public static function utf16_to_utf8($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" && $string[3] == "\0") return 'UTF-16LE';
if (function_exists('mb_detect_encoding')) {
if (empty($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;
default:
$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()));
return mb_detect_encoding($string, $encodings);
}
// No match, check for UTF-8
// from http://w3.org/International/questions/qa-forms-utf-8.html
if (preg_match('/\A(
[\x09\x0A\x0D\x20-\x7E]
| [\xC2-\xDF][\x80-\xBF]
| \xE0[\xA0-\xBF][\x80-\xBF]
| [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}
| \xED[\x80-\x9F][\x80-\xBF]
| \xF0[\x90-\xBF][\x80-\xBF]{2}
| [\xF1-\xF3][\x80-\xBF]{3}
| \xF4[\x80-\x8F][\x80-\xBF]{2}
)*\z/xs', substr($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 $input;
}
// iconv/mbstring are much faster (especially with long strings)
if (function_exists('mb_convert_encoding')) {
if (($res = mb_convert_encoding($input, 'UTF-8', 'UTF-8')) !== 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 .= $chr;
// first (or second) byte of multibyte sequence
}
else if ($ord >= 0xC0) {
if (strlen($seq) > 1) {
$out .= preg_match($regexp, $seq) ? $seq : '';
$seq = '';
}
else if ($seq && ord($seq) < 0xC0) {
$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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rcube_charset.php (26 KB)

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