(function(transit){
 
	var key = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

	transit.util = transit.util || {};	
	transit.util.base64 = {};

	transit.util.base64.encode = function( input ){
		var output = "",
			chr1, chr2, chr3,
			enc1, enc2, enc3, enc4, 
			i = 0;
			
		input = utf8_encode( input );
		
		while (i < input.length) {
			chr1 = input.charCodeAt(i++);
			chr2 = input.charCodeAt(i++);
			chr3 = input.charCodeAt(i++);
			enc1 = chr1 >> 2;
			enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
			enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
			enc4 = chr3 & 63;
 
			if( isNaN( chr2 ) ) enc3 = enc4 = 64;
			else if( isNaN( chr3 ) ) enc4 = 64;
 
			output = output +
			key.charAt(enc1) + 
			key.charAt(enc2) +
			key.charAt(enc3) + 
			key.charAt(enc4);
 
		}
		
		function utf8_encode( string ){
			var utftext = "", n, c;
			
			string = string.replace(/\r\n/g,"\n");
			
			for ( n = 0; n < string.length; n++ ){
				c = string.charCodeAt(n);
				
				if ( c < 128 ) utftext += String.fromCharCode(c);
				else if( (c > 127) && (c < 2048) ){
					utftext += String.fromCharCode((c >> 6) | 192);
					utftext += String.fromCharCode((c & 63) | 128);
				}else {
					utftext += String.fromCharCode((c >> 12) | 224);
					utftext += String.fromCharCode(((c >> 6) & 63) | 128);
					utftext += String.fromCharCode((c & 63) | 128);
				}
			}
			return utftext;
		}
		
		return output;
		
	};
	
	transit.util.base64.decode = function( input ){
		var output = "",
			chr1, chr2, chr3,
			enc1, enc2, enc3, enc4, 
			i = 0;
		
		input = input.replace( /[^A-Za-z0-9\+\/\=]/g, "" );
		
		while( i < input.length ){
 			enc1 = key.indexOf(input.charAt(i++));
			enc2 = key.indexOf(input.charAt(i++));
			enc3 = key.indexOf(input.charAt(i++));
			enc4 = key.indexOf(input.charAt(i++));
 
			chr1 = (enc1 << 2) | (enc2 >> 4);
			chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
			chr3 = ((enc3 & 3) << 6) | enc4;
 
			output = output + String.fromCharCode(chr1);
 
			if( enc3 != 64 ) output = output + String.fromCharCode(chr2);
			if( enc4 != 64 ) output = output + String.fromCharCode(chr3);
 
		}
		
		output = utf8_decode( output );
		
		function utf8_decode( textstr ) {
			var string = "",
				i = 0, 
				c = c1 = c2 = 0;

			while( i < textstr.length ){
				c = textstr.charCodeAt(i);

				if( c < 128 ) {
					string += String.fromCharCode(c);
					i++;
					
				}else if( (c > 191) && (c < 224) ) {
					c2 = textstr.charCodeAt(i+1);
					string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
					i += 2;
					
				}else {
					c2 = textstr.charCodeAt(i+1);
					c3 = textstr.charCodeAt(i+2);
					string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
					i += 3;
				}
			}

			return string;
		}
		
		return output;
		
	};

})(transit);