+/**
+ * Japanese header decoding function
+ *
+ * return human readable string from mime header. string is returned in euc-jp
+ * charset.
+ * @param string $ret header string
+ * @return string decoded header string
+ * @since 1.5.1
+ */
+function japanese_xtra_decodeheader($ret) {
+ if (function_exists('mb_detect_encoding')) {
+ $ret = str_replace("\t", "", $ret);
+ if (eregi('=\\?([^?]+)\\?(q|b)\\?([^?]+)\\?=', $ret))
+ $ret = @mb_decode_mimeheader($ret);
+ $ret = @mb_convert_encoding($ret, 'EUC-JP', 'AUTO');
+ }
+ return $ret;
+}
+
+/**
+ * Japanese downloaded filename processing function
+ *
+ * Returns shift-jis or euc-jp encoded file name
+ * @param string $ret string
+ * @param string $useragent browser
+ * @return string converted string
+ * @since 1.5.1
+ */
+function japanese_xtra_downloadfilename($ret,$useragent) {
+ if (function_exists('mb_detect_encoding')) {
+ if (strstr($useragent, 'Windows') !== false ||
+ strstr($useragent, 'Mac_') !== false) {
+ $ret = mb_convert_encoding($ret, 'SJIS', 'AUTO');
+ } else {
+ $ret = mb_convert_encoding($ret, 'EUC-JP', 'AUTO');
+ }
+ }
+ return $ret;
+}
+
+/**
+ * Japanese wordwrap function
+ *
+ * wraps text at set number of symbols
+ * @param string $ret text
+ * @param integer $wrap number of symbols per line
+ * @return string wrapped text
+ * @since 1.5.1
+ */
+function japanese_xtra_wordwrap($ret,$wrap) {
+ if (function_exists('mb_detect_encoding')) {
+ $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";
+ $no_end = "\x5c\x24\x28\x5b\x7b\xa1\xf2\x5c\xa1\xc6\xa1\xc8\xa1\xd2\xa1" .
+ "\xd4\xa1\xd6\xa1\xd8\xa1\xda\xa1\xcc\xa1\xf0\xa1\xca\xa1\xce\xa1\xd0\xa1\xef";
+
+ if (strlen($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;
+ }
+ }
+ return $ret;
+}
+
+/**
+ * Japanese imap folder name encoding function
+ *
+ * converts folder name from euc-jp to utf7-imap
+ * @param string $ret folder name
+ * @return string converted folder name
+ * @since 1.5.1
+ */
+function japanese_xtra_utf7_imap_encode($ret){
+ if (function_exists('mb_detect_encoding')) {
+ $ret = mb_convert_encoding($ret, 'UTF7-IMAP', 'EUC-JP');
+ }
+ return $ret;
+}
+
+/**
+ * Japanese imap folder name decoding function
+ *
+ * converts folder name from utf7-imap to euc-jp.
+ * @param string $ret folder name in utf7-imap
+ * @return string converted folder name
+ * @since 1.5.1
+ */
+function japanese_xtra_utf7_imap_decode($ret) {
+ if (function_exists('mb_detect_encoding')) {
+ $ret = mb_convert_encoding($ret, 'EUC-JP', 'UTF7-IMAP');
+ }
+ return $ret;
+}
+
+/**
+ * Japanese string trimming function
+ *
+ * trims string to defined number of symbols
+ * @param string $ret string
+ * @param integer $width number of symbols
+ * @return string trimmed string
+ * @since 1.5.1
+ */
+function japanese_xtra_strimwidth($ret,$width) {
+ if (function_exists('mb_detect_encoding')) {
+ $ret = mb_strimwidth($ret, 0, $width, '...');
+ }
+ return $ret;
+}
+
+/********************************
+ * Korean charset extra functions
+ ********************************/
+
+/**
+ * Korean downloaded filename processing functions
+ *
+ * @param string default return value
+ * @return string
+ */
+function korean_xtra_downloadfilename($ret) {
+ $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] = '_';
+ }