/**
*
*  Base64 encode / decode
*  http://www.webtoolkit.info/
*
**/

var Base64 = {

        // private property
        _keyStr :
				"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

        // public method for encoding
	encode : function (input) {
		var output = "";
		var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
		var i = 0;

		input = Base64._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 +
					this._keyStr.charAt(enc1) +
					this._keyStr.charAt(enc2) +
					this._keyStr.charAt(enc3) +
					this._keyStr.charAt(enc4);

		}

		return output;
	},

        // public method for decoding
 decode : function (input) {
	 var output = "";
	 var chr1, chr2, chr3;
	 var enc1, enc2, enc3, enc4;
	 var i = 0;

	 input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

	 while (i < input.length) {

		 enc1 = this._keyStr.indexOf(input.charAt(i++));
		 enc2 = this._keyStr.indexOf(input.charAt(i++));
		 enc3 = this._keyStr.indexOf(input.charAt(i++));
		 enc4 = this._keyStr.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 = Base64._utf8_decode(output);

	 return output;

 },

        // private method for UTF-8 encoding
 _utf8_encode : function (string) {
	 string = string.replace(/\r\n/g,"\n");
	 var utftext = "";

	 for (var n = 0; n < string.length; n++) {

		 var 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;
 },

        // private method for UTF-8 decoding
 _utf8_decode : function (utftext) {
	 var string = "";
	 var i = 0;
	 var c = c1 = c2 = 0;

	 while ( i < utftext.length ) {

		 c = utftext.charCodeAt(i);

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

	 }

	 return string;
 }

};