/usr/share/squirrelmail/functions/decode/gb18030.php is in squirrelmail-decode 1.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/**
* SquirrelMail GB18030 decoding functions
*
* This file contains gb18030 decoding function that is needed to read
* gb18030 encoded mails in non-gb18030 locale.
*
* @copyright (c) 2005 The SquirrelMail Project Team
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
* @version $Id: gb18030.php 12467 2007-06-25 15:52:44Z kink $
* @package decode
* @subpackage eastasia
*/
/**
* Decode gb18030 encoded string
* @param string $string gb18030 string
* @param boolean $save_html don't html encode special characters if true
* @return string $string decoded string
*/
function charset_decode_gb18030 ($string, $save_html=false) {
// global $aggressive_decoding;
// don't do decoding when there are no 8bit symbols
if (! sq_is8bit($string,'gb18030'))
return $string;
// this is CPU intensive task. Use recode functions if they are available.
if (function_exists('recode_string')) {
// if string is already sanitized, undo htmlspecial chars
if (! $save_html) {
$string=str_replace(array('"','<','>','&'),array('"','<','>','&'),$string);
}
$string = recode_string("gb18030..html",$string);
// if string sanitizing is not needed, undo htmlspecialchars applied by recode.
if ($save_html) {
$string=str_replace(array('"','<','>','&'),array('"','<','>','&'),$string);
}
return $string;
}
/*
* iconv does not support html target, but internal utf-8 decoding is faster
* than pure php implementation.
*/
if (function_exists('iconv') && file_exists(SM_PATH . 'functions/decode/utf_8.php') ) {
include_once(SM_PATH . 'functions/decode/utf_8.php');
$string = iconv('gb18030','utf-8',$string);
return charset_decode_utf_8($string);
}
// mbstring does not support gb18030
// pure php decoding is not implemented.
return $string;
}
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