rlm@37: /**
rlm@37: *
rlm@37: *  Base64 encode / decode
rlm@37: *  http://www.webtoolkit.info/
rlm@37: *
rlm@37: **/
rlm@37:  
rlm@37: var Base64 = {
rlm@37:  
rlm@37: 	// private property
rlm@37: 	_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
rlm@37:  
rlm@37: 	// public method for encoding
rlm@37: 	encode : function (input) {
rlm@37: 		var output = "";
rlm@37: 		var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
rlm@37: 		var i = 0;
rlm@37:  
rlm@37: 		input = Base64._utf8_encode(input);
rlm@37:  
rlm@37: 		while (i < input.length) {
rlm@37:  
rlm@37: 			chr1 = input.charCodeAt(i++);
rlm@37: 			chr2 = input.charCodeAt(i++);
rlm@37: 			chr3 = input.charCodeAt(i++);
rlm@37:  
rlm@37: 			enc1 = chr1 >> 2;
rlm@37: 			enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
rlm@37: 			enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
rlm@37: 			enc4 = chr3 & 63;
rlm@37:  
rlm@37: 			if (isNaN(chr2)) {
rlm@37: 				enc3 = enc4 = 64;
rlm@37: 			} else if (isNaN(chr3)) {
rlm@37: 				enc4 = 64;
rlm@37: 			}
rlm@37:  
rlm@37: 			output = output +
rlm@37: 			this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
rlm@37: 			this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
rlm@37:  
rlm@37: 		}
rlm@37:  
rlm@37: 		return output;
rlm@37: 	},
rlm@37:  
rlm@37: 	// public method for decoding
rlm@37: 	decode : function (input) {
rlm@37: 		var output = "";
rlm@37: 		var chr1, chr2, chr3;
rlm@37: 		var enc1, enc2, enc3, enc4;
rlm@37: 		var i = 0;
rlm@37:  
rlm@37: 		input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
rlm@37:  
rlm@37: 		while (i < input.length) {
rlm@37:  
rlm@37: 			enc1 = this._keyStr.indexOf(input.charAt(i++));
rlm@37: 			enc2 = this._keyStr.indexOf(input.charAt(i++));
rlm@37: 			enc3 = this._keyStr.indexOf(input.charAt(i++));
rlm@37: 			enc4 = this._keyStr.indexOf(input.charAt(i++));
rlm@37:  
rlm@37: 			chr1 = (enc1 << 2) | (enc2 >> 4);
rlm@37: 			chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
rlm@37: 			chr3 = ((enc3 & 3) << 6) | enc4;
rlm@37:  
rlm@37: 			output = output + String.fromCharCode(chr1);
rlm@37:  
rlm@37: 			if (enc3 != 64) {
rlm@37: 				output = output + String.fromCharCode(chr2);
rlm@37: 			}
rlm@37: 			if (enc4 != 64) {
rlm@37: 				output = output + String.fromCharCode(chr3);
rlm@37: 			}
rlm@37:  
rlm@37: 		}
rlm@37:  
rlm@37: 		output = Base64._utf8_decode(output);
rlm@37:  
rlm@37: 		return output;
rlm@37:  
rlm@37: 	},
rlm@37:  
rlm@37: 	// private method for UTF-8 encoding
rlm@37: 	_utf8_encode : function (string) {
rlm@37: 		string = string.replace(/\r\n/g,"\n");
rlm@37: 		var utftext = "";
rlm@37:  
rlm@37: 		for (var n = 0; n < string.length; n++) {
rlm@37:  
rlm@37: 			var c = string.charCodeAt(n);
rlm@37:  
rlm@37: 			if (c < 128) {
rlm@37: 				utftext += String.fromCharCode(c);
rlm@37: 			}
rlm@37: 			else if((c > 127) && (c < 2048)) {
rlm@37: 				utftext += String.fromCharCode((c >> 6) | 192);
rlm@37: 				utftext += String.fromCharCode((c & 63) | 128);
rlm@37: 			}
rlm@37: 			else {
rlm@37: 				utftext += String.fromCharCode((c >> 12) | 224);
rlm@37: 				utftext += String.fromCharCode(((c >> 6) & 63) | 128);
rlm@37: 				utftext += String.fromCharCode((c & 63) | 128);
rlm@37: 			}
rlm@37:  
rlm@37: 		}
rlm@37:  
rlm@37: 		return utftext;
rlm@37: 	},
rlm@37:  
rlm@37: 	// private method for UTF-8 decoding
rlm@37: 	_utf8_decode : function (utftext) {
rlm@37: 		var string = "";
rlm@37: 		var i = 0;
rlm@37: 		var c = c1 = c2 = 0;
rlm@37:  
rlm@37: 		while ( i < utftext.length ) {
rlm@37:  
rlm@37: 			c = utftext.charCodeAt(i);
rlm@37:  
rlm@37: 			if (c < 128) {
rlm@37: 				string += String.fromCharCode(c);
rlm@37: 				i++;
rlm@37: 			}
rlm@37: 			else if((c > 191) && (c < 224)) {
rlm@37: 				c2 = utftext.charCodeAt(i+1);
rlm@37: 				string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
rlm@37: 				i += 2;
rlm@37: 			}
rlm@37: 			else {
rlm@37: 				c2 = utftext.charCodeAt(i+1);
rlm@37: 				c3 = utftext.charCodeAt(i+2);
rlm@37: 				string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
rlm@37: 				i += 3;
rlm@37: 			}
rlm@37:  
rlm@37: 		}
rlm@37:  
rlm@37: 		return string;
rlm@37: 	}
rlm@37:  
rlm@37: }