5 * Copyright (c) 2003-2004 The SquirrelMail Project Team
6 * Licensed under the GNU GPL. For full terms see the file COPYING.
8 * This file contains utf-8 decoding function that is needed to read
9 * utf-8 encoded mails in non-utf-8 locale.
11 * Every decoded character consists of n bytes. First byte is octal
12 * 300-375, other bytes - always octals 200-277.
14 * \a\b characters are decoded to html code octdec(a-300)*64 + octdec(b-200)
15 * \a\b\c characters are decoded to html code octdec(a-340)*64*64 + octdec(b-200)*64 + octdec(c-200)
17 * decoding cycle is unfinished. please test and report problems to tokul@users.sourceforge.net
20 * @package squirrelmail
25 * Decode utf-8 strings
26 * @param string $string Encoded string
27 * @return string Decoded string
29 function charset_decode_utf_8 ($string) {
30 global $default_charset,$squirrelmail_language;
32 if ($squirrelmail_language == 'ja_JP')
35 /* Only do the slow convert if there are 8-bit characters */
36 /* avoid using 0xA0 (\240) in ereg ranges. RH73 does not like that */
37 if (! ereg("[\200-\237]", $string) and ! ereg("[\241-\377]", $string))
40 // decode three byte unicode characters
41 $string = preg_replace("/([\340-\357])([\200-\277])([\200-\277])/e",
42 "'&#'.((ord('\\1')-224)*4096+(ord('\\2')-128)*64+(ord('\\3')-128)).';'",
45 // decode two byte unicode characters
46 $string = preg_replace("/([\300-\337])([\200-\277])/e",
47 "'&#'.((ord('\\1')-192)*64+(ord('\\2')-128)).';'",