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

var B = {

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

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

		  input = B._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
d : 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 = B._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;
	       }

}