//alert('base 64 included');

var tSN = {
	//temp string normalizer
	enc : function (str){return(Base64.encode(str));},//tSN.enc(
	dec : function (str){return(Base64.decode(str));}//tSN.dec(
};

var Base64 = {
	// private property
	_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

	// public method for encoding
	encode : function(input){
		if( nl(input) ){
			return '';
		}//end if
		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;
			}//end if

			output = output +
			this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
			this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
		}//end while
		return(output);
	}//end func
	,

	// public method for decoding
	decode : function(input){
		if( nl(input) ){
			return '';
		}//end if
		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);
			}//end if
			if(enc4 != 64){
				output = output + String.fromCharCode(chr3);
			}//end if
		}//end while
		output = Base64._utf8_decode(output);
		return(output);
	}//end func
	,

	// private method for UTF-8 encoding
	_utf8_encode : function(string){
		if( nl(string) ){
			//alert("[base64-_utf8_decode] : input is null. ")
			return;
		}//end if
		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);
			}//end if
		}//end for
		return(utftext);
	}//end func
	,

	// private method for UTF-8 decoding
	_utf8_decode : function (utftext) {
		if( nl(utftext) ){
			//alert("[base64-_utf8_decode] : input is null. ")
			return;
		}//end if
		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;
			}//end if
		}//end while
		return(string);
	}//end func
};