function chr(code)
{
	return String.fromCharCode(code);
}

function code2utf(code)
{
	if (code < 128) return chr(code);
	if (code < 2048) return chr(192+(code>>6)) + chr(128+(code&63));
	if (code < 65536) return chr(224+(code>>12)) + chr(128+((code>>6)&63)) + chr(128+(code&63));
	if (code < 2097152) return chr(240+(code>>18)) + chr(128+((code>>12)&63)) + chr(128+((code>>6)&63)) + chr(128+(code&63));
}

function _utf8Encode(str)
{	
	var utf8str = new Array();
	for (var i = 0; i < str.length; i++)
		utf8str[i] = code2utf(str.charCodeAt(i));
	return utf8str.join('');
}

function utf8Encode(str)
{	
	var utf8str = new Array();
	var pos,j = 0;
	var tmpStr = '';
	
	while ((pos = str.search(/[^\x00-\x7F]/)) != -1) {
		tmpStr = str.match(/([^\x00-\x7F]+[\x00-\x7F]{0,10})+/)[0];
		utf8str[j++] = str.substr(0, pos);
		utf8str[j++] = _utf8Encode(tmpStr);
		str = str.substr(pos + tmpStr.length);
	}
	
	utf8str[j++] = str;
	return utf8str.join('');
}

function _utf8Decode(utf8str)
{	
	var str = new Array();
	var code,code2,code3,code4,j = 0;
	for (var i = 0; i < utf8str.length; ) 
	{
		code = utf8str.charCodeAt(i++);
		if (code > 127) code2 = utf8str.charCodeAt(i++);
		if (code > 223) code3 = utf8str.charCodeAt(i++);
		if (code > 239) code4 = utf8str.charCodeAt(i++);
		
		if (code < 128) str[j++]= chr(code);
		else if (code < 224) str[j++] = chr(((code-192)<<6) + (code2-128));
		else if (code < 240) str[j++] = chr(((code-224)<<12) + ((code2-128)<<6) + (code3-128));
		else str[j++] = chr(((code-240)<<18) + ((code2-128)<<12) + ((code3-128)<<6) + (code4-128));
	}
	return str.join('');
}

function utf8Decode(utf8str)
{
	var str = new Array();
	var pos = 0;
	var tmpStr = '';
	var j=0;
	while ((pos = utf8str.search(/[^\x00-\x7F]/)) != -1) {
		tmpStr = utf8str.match(/([^\x00-\x7F]+[\x00-\x7F]{0,10})+/)[0];
		str[j++]= utf8str.substr(0, pos) + _utf8Decode(tmpStr);
		utf8str = utf8str.substr(pos + tmpStr.length);
	}
	
	str[j++] = utf8str;
	return str.join('');
}

function base64Encode(data)
{
	var b64_map = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-()';
	var byte1, byte2, byte3;
	var ch1, ch2, ch3, ch4;
	var result = new Array();
	var j = 0;
	for (var i = 0; i < data.length; i += 3) 
	{
		byte1 = data.charCodeAt(i);
		byte2 = data.charCodeAt(i+1);
		byte3 = data.charCodeAt(i+2);
		ch1 = byte1 >> 2;
		ch2 = ((byte1 & 3) << 4) | (byte2 >> 4);
		ch3 = ((byte2 & 15) << 2) | (byte3 >> 6);
		ch4 = byte3 & 63;
		
		if (isNaN(byte2))
			ch3 = ch4 = 64;
		else if (isNaN(byte3))
			ch4 = 64;

		result[j++] = b64_map.charAt(ch1) + b64_map.charAt(ch2) + b64_map.charAt(ch3) + b64_map.charAt(ch4);
	}

	return result.join('');
}

function base64Decode(data)
{
	data = data.replace(/[^a-z0-9\-\(\)]/ig, ''); // strip none base64 characters
	var b64_map = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-()';
	var byte1, byte2, byte3;
	var ch1, ch2, ch3, ch4;
	var result = new Array();
	var j = 0;
	while ((data.length%4) != 0)
		data += '=';
	
	for (var i = 0; i < data.length; i += 4) 
	{
		ch1 = b64_map.indexOf(data.charAt(i));
		ch2 = b64_map.indexOf(data.charAt(i+1));
		ch3 = b64_map.indexOf(data.charAt(i+2));
		ch4 = b64_map.indexOf(data.charAt(i+3));

		byte1 = (ch1 << 2) | (ch2 >> 4);
		byte2 = ((ch2 & 15) << 4) | (ch3 >> 2);
		byte3 = ((ch3 & 3) << 6) | ch4;

		result[j++] = String.fromCharCode(byte1);
		if (ch3 != 64) result[j++] = String.fromCharCode(byte2);
		if (ch4 != 64) result[j++] = String.fromCharCode(byte3);	
	}

	return result.join('');
}