<?php

/**
 * i18n.php
 *
 * Copyright (c) 1999-2003 The SquirrelMail Project Team
 * Licensed under the GNU GPL. For full terms see the file COPYING.
 *
 * This file contains variuos functions that are needed to do
 * internationalization of SquirrelMail.
 *
 * Internally the output character set is used. Other characters are
 * encoded using Unicode entities according to HTML 4.0.
 *
 * $Id$
 */

require_once(SM_PATH . 'functions/global.php');

/* Decodes a string to the internal encoding from the given charset */
function charset_decode ($charset, $string) {
    global $languages, $squirrelmail_language;

    if (isset($languages[$squirrelmail_language]['XTRA_CODE']) &&
        function_exists($languages[$squirrelmail_language]['XTRA_CODE'])) {
        $string = $languages[$squirrelmail_language]['XTRA_CODE']('decode', $string);
    }

    /* All HTML special characters are 7 bit and can be replaced first */
    
    $string = htmlspecialchars ($string);

    $charset = strtolower($charset);

    set_my_charset() ;

    /* controls cpu and memory intensive decoding cycles */
    $agresive_decoding = false;

    if (ereg('iso-8859-([[:digit:]]+)', $charset, $res)) {
        if ($res[1] == '1') {
	    include_once(SM_PATH . 'functions/decode/iso8859-1.php');
            $ret = charset_decode_iso8859_1 ($string);
        } else if ($res[1] == '2') {
	    include_once(SM_PATH . 'functions/decode/iso8859-2.php');
            $ret = charset_decode_iso8859_2 ($string);
        } else if ($res[1] == '3') {
	    include_once(SM_PATH . 'functions/decode/iso8859-3.php');
            $ret = charset_decode_iso8859_3 ($string);
        } else if ($res[1] == '4') {
	    include_once(SM_PATH . 'functions/decode/iso8859-4.php');
            $ret = charset_decode_iso8859_4 ($string);
        } else if ($res[1] == '5') {
	    include_once(SM_PATH . 'functions/decode/iso8859-5.php');
            $ret = charset_decode_iso8859_5 ($string);
        } else if ($res[1] == '6') {
	    include_once(SM_PATH . 'functions/decode/iso8859-6.php');
            $ret = charset_decode_iso8859_6 ($string);
        } else if ($res[1] == '7') {
	    include_once(SM_PATH . 'functions/decode/iso8859-7.php');
            $ret = charset_decode_iso8859_7 ($string);
        } else if ($res[1] == '8') {
	    include_once(SM_PATH . 'functions/decode/iso8859-8.php');
            $ret = charset_decode_iso8859_8 ($string);
        } else if ($res[1] == '9') {
	    include_once(SM_PATH . 'functions/decode/iso8859-9.php');
            $ret = charset_decode_iso8859_9 ($string);
        } else if ($res[1] == '10') {
	    include_once(SM_PATH . 'functions/decode/iso8859-10.php');
            $ret = charset_decode_iso8859_10 ($string);
        } else if ($res[1] == '11') {
	    include_once(SM_PATH . 'functions/decode/iso8859-11.php');
            $ret = charset_decode_iso8859_11 ($string);
        } else if ($res[1] == '13') {
	    include_once(SM_PATH . 'functions/decode/iso8859-13.php');
            $ret = charset_decode_iso8859_13 ($string);
        } else if ($res[1] == '14') {
	    include_once(SM_PATH . 'functions/decode/iso8859-14.php');
            $ret = charset_decode_iso8859_14 ($string);
        } else if ($res[1] == '15') {
	    include_once(SM_PATH . 'functions/decode/iso8859-15.php');
            $ret = charset_decode_iso8859_15 ($string);
        } else if ($res[1] == '16') {
	    include_once(SM_PATH . 'functions/decode/iso8859-16.php');
            $ret = charset_decode_iso8859_16 ($string);
        } else {
            $ret = charset_decode_iso_8859_default ($string);
        }
    } else if ($charset == 'ns_4551-1') {
        $ret = charset_decode_ns_4551_1 ($string);
    } else if ($charset == 'koi8-r') {
        include_once(SM_PATH . 'functions/decode/koi8-r.php');
        $ret = charset_decode_koi8r ($string);
    } else if ($charset == 'koi8-u') {
        include_once(SM_PATH . 'functions/decode/koi8-u.php');
        $ret = charset_decode_koi8u ($string);
    } else if ($charset == 'windows-1250') {
        include_once(SM_PATH . 'functions/decode/cp1250.php');
        $ret = charset_decode_cp1250 ($string);
    } else if ($charset == 'windows-1251') {
        include_once(SM_PATH . 'functions/decode/cp1251.php');
        $ret = charset_decode_cp1251 ($string);
    } else if ($charset == 'windows-1252') {
        include_once(SM_PATH . 'functions/decode/cp1252.php');
        $ret = charset_decode_cp1252 ($string);
    } else if ($charset == 'windows-1253') {
        include_once(SM_PATH . 'functions/decode/cp1253.php');
	$ret = charset_decode_cp1253 ($string);
    } else if ($charset == 'windows-1254') {
        include_once(SM_PATH . 'functions/decode/cp1254.php');
	$ret = charset_decode_cp1254 ($string);
    } else if ($charset == 'windows-1255') {
        include_once(SM_PATH . 'functions/decode/cp1255.php');
	$ret = charset_decode_cp1255 ($string);
    } else if ($charset == 'windows-1256') {
        include_once(SM_PATH . 'functions/decode/cp1256.php');
	$ret = charset_decode_cp1256 ($string);
    } else if ($charset == 'windows-1257') {
        include_once(SM_PATH . 'functions/decode/cp1257.php');
        $ret = charset_decode_cp1257 ($string);
    } else if ($charset == 'windows-1258') {
        include_once(SM_PATH . 'functions/decode/cp1258.php');
        $ret = charset_decode_cp1258 ($string);
    } else if ($charset == 'big5' and $agresive_decoding ) {
        include_once(SM_PATH . 'functions/decode/big5.php');
        $ret = charset_decode_big5 ($string);
    } else if ($charset == 'gb2312' and $agresive_decoding ) {
        include_once(SM_PATH . 'functions/decode/gb2312.php');
        $ret = charset_decode_gb2312 ($string);
    } else if ($charset == 'utf-8') {
        include_once(SM_PATH . 'functions/decode/utf-8.php');
	$ret = charset_decode_utf8 ($string);
    } else {
        $ret = $string;
    }
    return( $ret );
}


/* Remove all 8 bit characters from all other ISO-8859 character sets */
function charset_decode_iso_8859_default ($string) {
    return (strtr($string, "\240\241\242\243\244\245\246\247".
                    "\250\251\252\253\254\255\256\257".
                    "\260\261\262\263\264\265\266\267".
                    "\270\271\272\273\274\275\276\277".
                    "\300\301\302\303\304\305\306\307".
                    "\310\311\312\313\314\315\316\317".
                    "\320\321\322\323\324\325\326\327".
                    "\330\331\332\333\334\335\336\337".
                    "\340\341\342\343\344\345\346\347".
                    "\350\351\352\353\354\355\356\357".
                    "\360\361\362\363\364\365\366\367".
                    "\370\371\372\373\374\375\376\377",
                    "????????????????????????????????????????".
                    "????????????????????????????????????????".
                    "????????????????????????????????????????".
                    "????????"));

}

/*
 * This is the same as ISO-646-NO and is used by some
 * Microsoft programs when sending Norwegian characters
 */
function charset_decode_ns_4551_1 ($string) {
    /*
     * These characters are:
     * Latin capital letter AE
     * Latin capital letter O with stroke
     * Latin capital letter A with ring above
     * and the same as small letters
     */
    return strtr ($string, "[\\]{|}", "ئطإوّه");
}


/*
 * Set up the language to be output
 * if $do_search is true, then scan the browser information
 * for a possible language that we know
 */
function set_up_language($sm_language, $do_search = false, $default = false) {

    static $SetupAlready = 0;
    global $use_gettext, $languages,
           $squirrelmail_language, $squirrelmail_default_language,
           $sm_notAlias;

    if ($SetupAlready) {
        return;
    }

    $SetupAlready = TRUE;
    sqgetGlobalVar('HTTP_ACCEPT_LANGUAGE',  $accept_lang, SQ_SERVER);

    if ($do_search && ! $sm_language && isset($accept_lang)) {
        $sm_language = substr($accept_lang, 0, 2);
    }
    
    if ((!$sm_language||$default) && isset($squirrelmail_default_language)) {
        $squirrelmail_language = $squirrelmail_default_language;
        $sm_language = $squirrelmail_default_language;
    }
    $sm_notAlias = $sm_language;
    while (isset($languages[$sm_notAlias]['ALIAS'])) {
        $sm_notAlias = $languages[$sm_notAlias]['ALIAS'];
    }

    if ( isset($sm_language) &&
         $use_gettext &&
         $sm_language != '' &&
         isset($languages[$sm_notAlias]['CHARSET']) ) {
        bindtextdomain( 'squirrelmail', SM_PATH . 'locale/' );
        textdomain( 'squirrelmail' );
	if (function_exists('bind_textdomain_codeset')) {
	     bind_textdomain_codeset ("squirrelmail", $languages[$sm_notAlias]['CHARSET'] );
	}
	if (isset($languages[$sm_notAlias]['LOCALE'])){
	  $longlocale=$languages[$sm_notAlias]['LOCALE'];
	} else {
	  $longlocale=$sm_notAlias;
	}
        if ( !ini_get('safe_mode') &&
             getenv( 'LC_ALL' ) != $longlocale ) {
            putenv( "LC_ALL=$longlocale" );
            putenv( "LANG=$longlocale" );
            putenv( "LANGUAGE=$longlocale" );
        }
	setlocale(LC_ALL, $longlocale);
	$squirrelmail_language = $sm_notAlias;
        if ($squirrelmail_language == 'ja_JP' && function_exists('mb_detect_encoding') ) {
            header ('Content-Type: text/html; charset=EUC-JP');
            if (!function_exists('mb_internal_encoding')) {
                echo _("You need to have php4 installed with the multibyte string function enabled (using configure option --enable-mbstring).");
            }
            if (function_exists('mb_language')) {
                mb_language('Japanese');
            }
            mb_internal_encoding('EUC-JP');
            mb_http_output('pass');
        } else {
        header( 'Content-Type: text/html; charset=' . $languages[$sm_notAlias]['CHARSET'] );
    }
}
}

function set_my_charset(){

    /*
     * There can be a $default_charset setting in the
     * config.php file, but the user may have a different language
     * selected for a user interface. This function checks the
     * language selected by the user and tags the outgoing messages
     * with the appropriate charset corresponding to the language
     * selection. This is "more right" (tm), than just stamping the
     * message blindly with the system-wide $default_charset.
     */
    global $data_dir, $username, $default_charset, $languages, $squirrelmail_default_language;

    $my_language = getPref($data_dir, $username, 'language');
    if (!$my_language) {
        $my_language = $squirrelmail_default_language ;
    }
    while (isset($languages[$my_language]['ALIAS'])) {
        $my_language = $languages[$my_language]['ALIAS'];
    }
    $my_charset = $languages[$my_language]['CHARSET'];
    if ($my_charset) {
        $default_charset = $my_charset;
    }
}

/* ------------------------------ main --------------------------- */

global $squirrelmail_language, $languages, $use_gettext;

if (! isset($squirrelmail_language)) {
    $squirrelmail_language = '';
}

/* This array specifies the available languages. */

if ( file_exists( SM_PATH . 'locale/ca_ES') ) {
    // The glibc locale is ca_ES.
    $languages['ca_ES']['NAME']    = 'Catalan';
    $languages['ca_ES']['CHARSET'] = 'iso-8859-1';
    $languages['ca']['ALIAS'] = 'ca_ES';
}

if ( file_exists( SM_PATH . 'locale/cs_CZ') ) {
    $languages['cs_CZ']['NAME']    = 'Czech';
    $languages['cs_CZ']['CHARSET'] = 'iso-8859-2';
    $languages['cs']['ALIAS']      = 'cs_CZ';
}

if ( file_exists( SM_PATH . 'locale/da_DK') ) {
    // Danish locale is da_DK.
    $languages['da_DK']['NAME']    = 'Danish';
    $languages['da_DK']['CHARSET'] = 'iso-8859-1';
    $languages['da']['ALIAS'] = 'da_DK';
}

if ( file_exists( SM_PATH . 'locale/de_DE') ) {
    $languages['de_DE']['NAME']    = 'Deutsch';
    $languages['de_DE']['CHARSET'] = 'iso-8859-1';
    $languages['de']['ALIAS'] = 'de_DE';
}

// There is no en_EN! There is en_US, en_BR, en_AU, and so forth, 
// but who cares about !US, right? Right? :)

if ( file_exists( SM_PATH . 'locale/el_GR') ) {
    $languages['el_GR']['NAME']    = 'Greek';
    $languages['el_GR']['CHARSET'] = 'iso-8859-7';
    $languages['el']['ALIAS'] = 'el_GR';
}

$languages['en_US']['NAME']    = 'English';
$languages['en_US']['CHARSET'] = 'iso-8859-1';
$languages['en']['ALIAS'] = 'en_US';

if ( file_exists( SM_PATH . 'locale/es_ES') ) {
    $languages['es_ES']['NAME']    = 'Spanish';
    $languages['es_ES']['CHARSET'] = 'iso-8859-1';
    $languages['es']['ALIAS'] = 'es_ES';
}
if ( file_exists( SM_PATH . 'locale/et_EE') ) {
    $languages['et_EE']['NAME']    = 'Estonian';
    $languages['et_EE']['CHARSET'] = 'iso-8859-15';
    $languages['et']['ALIAS'] = 'et_EE';
}
if ( file_exists( SM_PATH . 'locale/fo_FO') ) {
    $languages['fo_FO']['NAME']    = 'Faroese';
    $languages['fo_FO']['CHARSET'] = 'iso-8859-1';
    $languages['fo']['ALIAS'] = 'fo_FO';
}
if ( file_exists( SM_PATH . 'locale/fi_FI') ) {
    $languages['fi_FI']['NAME']    = 'Finnish';
    $languages['fi_FI']['CHARSET'] = 'iso-8859-1';
    $languages['fi']['ALIAS'] = 'fi_FI';
}
if ( file_exists( SM_PATH . 'locale/fr_FR') ) {
    $languages['fr_FR']['NAME']    = 'French';
    $languages['fr_FR']['CHARSET'] = 'iso-8859-1';
    $languages['fr']['ALIAS'] = 'fr_FR';
}
if ( file_exists( SM_PATH . 'locale/hr_HR') ) {
    $languages['hr_HR']['NAME']    = 'Croatian';
    $languages['hr_HR']['CHARSET'] = 'iso-8859-2';
    $languages['hr']['ALIAS'] = 'hr_HR';
}
if ( file_exists( SM_PATH . 'locale/hu_HU') ) {
    $languages['hu_HU']['NAME']    = 'Hungarian';
    $languages['hu_HU']['CHARSET'] = 'iso-8859-2';
    $languages['hu']['ALIAS'] = 'hu_HU';
}
if ( file_exists( SM_PATH . 'locale/id_ID') ) {
    $languages['id_ID']['NAME']    = 'Bahasa Indonesia';
    $languages['id_ID']['CHARSET'] = 'iso-8859-1';
    $languages['id']['ALIAS'] = 'id_ID';
}
if ( file_exists( SM_PATH . 'locale/is_IS') ) {
    $languages['is_IS']['NAME']    = 'Icelandic';
    $languages['is_IS']['CHARSET'] = 'iso-8859-1';
    $languages['is']['ALIAS'] = 'is_IS';
}
if ( file_exists( SM_PATH . 'locale/it_IT') ) {
    $languages['it_IT']['NAME']    = 'Italian';
    $languages['it_IT']['CHARSET'] = 'iso-8859-1';
    $languages['it']['ALIAS'] = 'it_IT';
}
if ( file_exists( SM_PATH . 'locale/ja_JP') ) {
    $languages['ja_JP']['NAME']    = 'Japanese';
    $languages['ja_JP']['CHARSET'] = 'iso-2022-jp';
    $languages['ja_JP']['XTRA_CODE'] = 'japanese_charset_xtra';
    $languages['ja']['ALIAS'] = 'ja_JP';
}
if ( file_exists( SM_PATH . 'locale/ko_KR') ) {
    $languages['ko_KR']['NAME']    = 'Korean';
    $languages['ko_KR']['CHARSET'] = 'euc-KR';
    $languages['ko_KR']['XTRA_CODE'] = 'korean_charset_xtra';
    $languages['ko']['ALIAS'] = 'ko_KR';
}
if ( file_exists( SM_PATH . 'locale/nl_NL') ) {
    $languages['nl_NL']['NAME']    = 'Dutch';
    $languages['nl_NL']['CHARSET'] = 'iso-8859-1';
    $languages['nl']['ALIAS'] = 'nl_NL';
}
if ( file_exists( SM_PATH . 'locale/no_NO') ) {
    $languages['no_NO']['NAME']    = 'Norwegian (Bokm&aring;l)';
    $languages['no_NO']['CHARSET'] = 'iso-8859-1';
    $languages['no']['ALIAS'] = 'no_NO';
}
if ( file_exists( SM_PATH . 'locale/nn_NO') ) {
    $languages['nn_NO']['NAME']    = 'Norwegian (Nynorsk)';
    $languages['nn_NO']['CHARSET'] = 'iso-8859-1';
}
if ( file_exists( SM_PATH . 'locale/pl_PL') ) {
    $languages['pl_PL']['NAME']    = 'Polish';
    $languages['pl_PL']['CHARSET'] = 'iso-8859-2';
    $languages['pl']['ALIAS'] = 'pl_PL';
}
if ( file_exists( SM_PATH . 'locale/pt_PT') ) {
    $languages['pt_PT']['NAME'] = 'Portuguese (Portugal)';
    $languages['pt_PT']['CHARSET'] = 'iso-8859-1';
    $languages['pt']['ALIAS'] = 'pt_PT';
}
if ( file_exists( SM_PATH . 'locale/pt_BR') ) {
    $languages['pt_BR']['NAME']    = 'Portuguese (Brazil)';
    $languages['pt_BR']['CHARSET'] = 'iso-8859-1';
}
if ( file_exists( SM_PATH . 'locale/ru_RU') ) {
    $languages['ru_RU']['NAME']    = 'Russian';
    $languages['ru_RU']['CHARSET'] = 'koi8-r';
    $languages['ru_RU']['LOCALE'] = 'ru_RU.KOI8-R';
    $languages['ru']['ALIAS'] = 'ru_RU';
}
if ( file_exists( SM_PATH . 'locale/sr_YU') ) {
    $languages['sr_YU']['NAME']    = 'Serbian';
    $languages['sr_YU']['CHARSET'] = 'iso-8859-2';
    $languages['sr']['ALIAS'] = 'sr_YU';
}
if ( file_exists( SM_PATH . 'locale/sv_SE') ) {
    $languages['sv_SE']['NAME']    = 'Swedish';
    $languages['sv_SE']['CHARSET'] = 'iso-8859-1';
    $languages['sv']['ALIAS'] = 'sv_SE';
}
if ( file_exists( SM_PATH . 'locale/tr_TR') ) {
    $languages['tr_TR']['NAME']    = 'Turkish';
    $languages['tr_TR']['CHARSET'] = 'iso-8859-9';
    $languages['tr']['ALIAS'] = 'tr_TR';
}
if ( file_exists( SM_PATH . 'locale/zh_TW') ) {
    $languages['zh_TW']['NAME']    = 'Chinese Trad';
    $languages['zh_TW']['CHARSET'] = 'big5';
    $languages['tw']['ALIAS'] = 'zh_TW';
}
if ( file_exists( SM_PATH . 'locale/zh_CN') ) {
    $languages['zh_CN']['NAME']    = 'Chinese Simp';
    $languages['zh_CN']['CHARSET'] = 'gb2312';
    $languages['cn']['ALIAS'] = 'zh_CN';
}
if ( file_exists( SM_PATH . 'locale/sk_SK') ) {
    $languages['sk_SK']['NAME']     = 'Slovak';
    $languages['sk_SK']['CHARSET']  = 'iso-8859-2';
    $languages['sk']['ALIAS']       = 'sk_SK';
}
if ( file_exists( SM_PATH . 'locale/ro_RO') ) {
    $languages['ro_RO']['NAME']    = 'Romanian';
    $languages['ro_RO']['CHARSET'] = 'iso-8859-2';
    $languages['ro']['ALIAS'] = 'ro_RO';
}
if ( file_exists( SM_PATH . 'locale/th_TH') ) {
    $languages['th_TH']['NAME']    = 'Thai';
    $languages['th_TH']['CHARSET'] = 'tis-620';
    $languages['th']['ALIAS'] = 'th_TH';
}
if ( file_exists( SM_PATH . 'locale/lt_LT') ) {
    $languages['lt_LT']['NAME']    = 'Lithuanian';
    $languages['lt_LT']['CHARSET'] = 'iso-8859-4';
    $languages['lt_LT']['LOCALE'] = 'lt_LT.ISO-8859-4';
    $languages['lt']['ALIAS'] = 'lt_LT';
}
if ( file_exists( SM_PATH . 'locale/sl_SI') ) {
    $languages['sl_SI']['NAME']    = 'Slovenian';
    $languages['sl_SI']['CHARSET'] = 'iso-8859-2';
    $languages['sl']['ALIAS'] = 'sl_SI';
}
if ( file_exists( SM_PATH . 'locale/bg_BG') ) {
    $languages['bg_BG']['NAME']    = 'Bulgarian';
    $languages['bg_BG']['CHARSET'] = 'windows-1251';
    $languages['bg']['ALIAS'] = 'bg_BG';
}
if ( file_exists( SM_PATH . 'locale/uk_UA') ) {
    $languages['uk_UA']['NAME']    = 'Ukrainian';
    $languages['uk_UA']['CHARSET'] = 'koi8-u';
    $languages['uk']['ALIAS'] = 'uk_UA';
}
if ( file_exists( SM_PATH . 'locale/cy_GB') ) {
    $languages['cy_GB']['NAME']    = 'Welsh';
    $languages['cy_GB']['CHARSET'] = 'iso-8859-1';
    $languages['cy']['ALIAS'] = 'cy_GB';
}
if ( file_exists( SM_PATH . 'locale/vi_VN') ) {
    $languages['vi_VN']['NAME']    = 'Vietnamese';
    $languages['vi_VN']['CHARSET'] = 'utf-8';
    $languages['vi']['ALIAS'] = 'vi_VN';
}
// Right to left languages
if ( file_exists( SM_PATH . 'locale/ar') ) {
    $languages['ar']['NAME']    = 'Arabic';
    $languages['ar']['CHARSET'] = 'windows-1256';
    $languages['ar']['DIR']     = 'rtl';
}
if ( file_exists( SM_PATH . 'locale/he_IL') ) {
    $languages['he_IL']['NAME']    = 'Hebrew';
    $languages['he_IL']['CHARSET'] = 'windows-1255';
    $languages['he_IL']['DIR']     = 'rtl';
    $languages['he']['ALIAS']      = 'he_IL';
}

/* Detect whether gettext is installed. */
$gettext_flags = 0;
if (function_exists('_')) {
    $gettext_flags += 1;
}
if (function_exists('bindtextdomain')) {
    $gettext_flags += 2;
}
if (function_exists('textdomain')) {
    $gettext_flags += 4;
}

/* If gettext is fully loaded, cool */
if ($gettext_flags == 7) {
    $use_gettext = true;
}
/* If we can fake gettext, try that */
elseif ($gettext_flags == 0) {
    $use_gettext = true;
    include_once(SM_PATH . 'functions/gettext.php');
} else {
    /* Uh-ho.  A weird install */
    if (! $gettext_flags & 1) {
        function _($str) {
            return $str;
        }
    }
    if (! $gettext_flags & 2) {
        function bindtextdomain() {
            return;
        }
    }
    if (! $gettext_flags & 4) {
        function textdomain() {
            return;
        }
    }
}


/*
 * Japanese charset extra function
 *
 */
function japanese_charset_xtra() {
    $ret = func_get_arg(1);  /* default return value */
    if (function_exists('mb_detect_encoding')) {
        switch (func_get_arg(0)) { /* action */
        case 'decode':
            $detect_encoding = @mb_detect_encoding($ret);
            if ($detect_encoding == 'JIS' ||
                $detect_encoding == 'EUC-JP' ||
                $detect_encoding == 'SJIS' ||
                $detect_encoding == 'UTF-8') {
                
                $ret = mb_convert_kana(mb_convert_encoding($ret, 'EUC-JP', 'AUTO'), "KV");
            }
            break;
        case 'encode':
            $detect_encoding = @mb_detect_encoding($ret);
            if ($detect_encoding == 'JIS' ||
                $detect_encoding == 'EUC-JP' ||
                $detect_encoding == 'SJIS' ||
                $detect_encoding == 'UTF-8') {
                
                $ret = mb_convert_encoding(mb_convert_kana($ret, "KV"), 'JIS', 'AUTO');
            }
            break;
        case 'strimwidth':
            $width = func_get_arg(2);
            $ret = mb_strimwidth($ret, 0, $width, '...'); 
            break;
        case 'encodeheader':
            $result = '';
            if (strlen($ret) > 0) {
                $tmpstr = mb_substr($ret, 0, 1);
                $prevcsize = strlen($tmpstr);
                for ($i = 1; $i < mb_strlen($ret); $i++) {
                    $tmp = mb_substr($ret, $i, 1);
                    if (strlen($tmp) == $prevcsize) {
                        $tmpstr .= $tmp;
                    } else {
                        if ($prevcsize == 1) {
                            $result .= $tmpstr;
                        } else {
                            $result .= str_replace(' ', '', 
                                                   mb_encode_mimeheader($tmpstr,'iso-2022-jp','B',''));
                        }
                        $tmpstr = $tmp;
                        $prevcsize = strlen($tmp);
                    }
                }
                if (strlen($tmpstr)) {
                    if (strlen(mb_substr($tmpstr, 0, 1)) == 1)
                        $result .= $tmpstr;
                    else
                        $result .= str_replace(' ', '',
                                               mb_encode_mimeheader($tmpstr,'iso-2022-jp','B',''));
                }
            }
            $ret = $result;
            break;
        case 'decodeheader':
            $ret = str_replace("\t", "", $ret);
            if (eregi('=\\?([^?]+)\\?(q|b)\\?([^?]+)\\?=', $ret))
                $ret = @mb_decode_mimeheader($ret);
            $ret = @mb_convert_encoding($ret, 'EUC-JP', 'AUTO');
            break;
        case 'downloadfilename':
            $useragent = func_get_arg(2);
            if (strstr($useragent, 'Windows') !== false ||
                strstr($useragent, 'Mac_') !== false) {
                $ret = mb_convert_encoding($ret, 'SJIS', 'AUTO');
            } else {
                $ret = mb_convert_encoding($ret, 'EUC-JP', 'AUTO');
}
            break;
        case 'wordwrap':
            $no_begin = "\x21\x25\x29\x2c\x2e\x3a\x3b\x3f\x5d\x7d\xa1\xf1\xa1\xeb\xa1" .
                "\xc7\xa1\xc9\xa2\xf3\xa1\xec\xa1\xed\xa1\xee\xa1\xa2\xa1\xa3\xa1\xb9" .
                "\xa1\xd3\xa1\xd5\xa1\xd7\xa1\xd9\xa1\xdb\xa1\xcd\xa4\xa1\xa4\xa3\xa4" .
                "\xa5\xa4\xa7\xa4\xa9\xa4\xc3\xa4\xe3\xa4\xe5\xa4\xe7\xa4\xee\xa1\xab" .
                "\xa1\xac\xa1\xb5\xa1\xb6\xa5\xa1\xa5\xa3\xa5\xa5\xa5\xa7\xa5\xa9\xa5" .
                "\xc3\xa5\xe3\xa5\xe5\xa5\xe7\xa5\xee\xa5\xf5\xa5\xf6\xa1\xa6\xa1\xbc" .
                "\xa1\xb3\xa1\xb4\xa1\xaa\xa1\xf3\xa1\xcb\xa1\xa4\xa1\xa5\xa1\xa7\xa1" .
                "\xa8\xa1\xa9\xa1\xcf\xa1\xd1";
            $no_end = "\x5c\x24\x28\x5b\x7b\xa1\xf2\x5c\xa1\xc6\xa1\xc8\xa1\xd2\xa1" .
                "\xd4\xa1\xd6\xa1\xd8\xa1\xda\xa1\xcc\xa1\xf0\xa1\xca\xa1\xce\xa1\xd0\xa1\xef";
            $wrap = func_get_arg(2);
            
            if (strlen($ret) >= $wrap && 
                substr($ret, 0, 1) != '>' &&
                strpos($ret, 'http://') === FALSE &&
                strpos($ret, 'https://') === FALSE &&
                strpos($ret, 'ftp://') === FALSE) {
                
                $ret = mb_convert_kana($ret, "KV");

                $line_new = '';
                $ptr = 0;
                
                while ($ptr < strlen($ret) - 1) {
                    $l = mb_strcut($ret, $ptr, $wrap);
                    $ptr += strlen($l);
                    $tmp = $l;
                    
                    $l = mb_strcut($ret, $ptr, 2);
                    while (strlen($l) != 0 && mb_strpos($no_begin, $l) !== FALSE ) {
                        $tmp .= $l;
                        $ptr += strlen($l);
                        $l = mb_strcut($ret, $ptr, 1);
                    }
                    $line_new .= $tmp;
                    if ($ptr < strlen($ret) - 1)
                        $line_new .= "\n";
                }
                $ret = $line_new;
            }
            break;
        case 'utf7-imap_encode':
            $ret = mb_convert_encoding($ret, 'UTF7-IMAP', 'EUC-JP');
            break;
        case 'utf7-imap_decode':
            $ret = mb_convert_encoding($ret, 'EUC-JP', 'UTF7-IMAP');
            break;
        }
    }
    return $ret;
}


/*
 * Korean charset extra function
 * Hangul(Korean Character) Attached File Name Fix.
 */
function korean_charset_xtra() {
    
    $ret = func_get_arg(1);  /* default return value */
    if (func_get_arg(0) == 'downloadfilename') { /* action */
        $ret = str_replace("\x0D\x0A", '', $ret);  /* Hanmail's CR/LF Clear */
        for ($i=0;$i<strlen($ret);$i++) {
            if ($ret[$i] >= "\xA1" && $ret[$i] <= "\xFE") {   /* 0xA1 - 0XFE are Valid */
                $i++;
                continue;
            } else if (($ret[$i] >= 'a' && $ret[$i] <= 'z') || /* From Original ereg_replace in download.php */
                       ($ret[$i] >= 'A' && $ret[$i] <= 'Z') ||
                       ($ret[$i] == '.') || ($ret[$i] == '-')) {
                continue;
            } else {
                $ret[$i] = '_';
            }
        }

    }

    return $ret;
}

?>