https://flourishpaediatrics.com.au/js/jquery/jquery.base64.js

1/**
2* jQuery BASE64 functions
3* 
4* 	<code>
5* 		Encodes the given data with base64. 
6* 		String $.base64Encode ( String str )
7*		<br />
8* 		Decodes a base64 encoded data.
9* 		String $.base64Decode ( String str )
10* 	</code>
11* 
12* Encodes and Decodes the given data in base64.
13* This encoding is designed to make binary data survive transport through transport layers that are not 8-bit clean, such as mail bodies.
14* Base64-encoded data takes about 33% more space than the original data. 
15* This javascript code is used to encode / decode data using base64 (this encoding is designed to make binary data survive transport through transport layers that are not 8-bit clean). Script is fully compatible with UTF-8 encoding. You can use base64 encoded data as simple encryption mechanism.
16* If you plan using UTF-8 encoding in your project don't forget to set the page encoding to UTF-8 (Content-Type meta tag). 
17* This function orginally get from the WebToolkit and rewrite for using as the jQuery plugin.
18* 
19* Example
20* 	Code
21* 		<code>
22* 			$.base64Encode("I'm Persian."); 
23* 		</code>
24* 	Result
25* 		<code>
26* 			"SSdtIFBlcnNpYW4u"
27* 		</code>
28* 	Code
29* 		<code>
30* 			$.base64Decode("SSdtIFBlcnNpYW4u");
31* 		</code>
32* 	Result
33* 		<code>
34* 			"I'm Persian."
35* 		</code>
36* 
37* @alias Muhammad Hussein Fattahizadeh < muhammad [AT] semnanweb [DOT] com >
38* @link http://www.semnanweb.com/jquery-plugin/base64.html
39* @see http://www.webtoolkit.info/
40* @license http://www.gnu.org/licenses/gpl.html [GNU General Public License]
41* @param {jQuery} {base64Encode:function(input))
42* @param {jQuery} {base64Decode:function(input))
43* @return string
44*/
45
46(function($){
47
48var keyString = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
49
50var uTF8Encode = function(string) {
51	string = string.replace(/\x0d\x0a/g, "\x0a");
52	var output = "";
53	for (var n = 0; n < string.length; n++) {
54		var c = string.charCodeAt(n);
55		if (c < 128) {
56			output += String.fromCharCode(c);
57		} else if ((c > 127) && (c < 2048)) {
58			output += String.fromCharCode((c >> 6) | 192);
59			output += String.fromCharCode((c & 63) | 128);
60		} else {
61			output += String.fromCharCode((c >> 12) | 224);
62			output += String.fromCharCode(((c >> 6) & 63) | 128);
63			output += String.fromCharCode((c & 63) | 128);
64		}
65	}
66	return output;
67};
68
69var uTF8Decode = function(input) {
70	var string = "";
71	var i = 0;
72	var c = c1 = c2 = 0;
73	while ( i < input.length ) {
74		c = input.charCodeAt(i);
75		if (c < 128) {
76			string += String.fromCharCode(c);
77			i++;
78		} else if ((c > 191) && (c < 224)) {
79			c2 = input.charCodeAt(i+1);
80			string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
81			i += 2;
82		} else {
83			c2 = input.charCodeAt(i+1);
84			c3 = input.charCodeAt(i+2);
85			string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
86			i += 3;
87		}
88	}
89	return string;
90}
91
92$.extend({
93	base64Encode: function(input) {
94		var output = "";
95		var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
96		var i = 0;
97		input = uTF8Encode(input);
98		while (i < input.length) {
99			chr1 = input.charCodeAt(i++);
100			chr2 = input.charCodeAt(i++);
101			chr3 = input.charCodeAt(i++);
102			enc1 = chr1 >> 2;
103			enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
104			enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
105			enc4 = chr3 & 63;
106			if (isNaN(chr2)) {
107				enc3 = enc4 = 64;
108			} else if (isNaN(chr3)) {
109				enc4 = 64;
110			}
111			output = output + keyString.charAt(enc1) + keyString.charAt(enc2) + keyString.charAt(enc3) + keyString.charAt(enc4);
112		}
113		return output;
114	},
115	base64Decode: function(input) {
116		var output = "";
117		var chr1, chr2, chr3;
118		var enc1, enc2, enc3, enc4;
119		var i = 0;
120		input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
121		while (i < input.length) {
122			enc1 = keyString.indexOf(input.charAt(i++));
123			enc2 = keyString.indexOf(input.charAt(i++));
124			enc3 = keyString.indexOf(input.charAt(i++));
125			enc4 = keyString.indexOf(input.charAt(i++));
126			chr1 = (enc1 << 2) | (enc2 >> 4);
127			chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
128			chr3 = ((enc3 & 3) << 6) | enc4;
129			output = output + String.fromCharCode(chr1);
130			if (enc3 != 64) {
131				output = output + String.fromCharCode(chr2);
132			}
133			if (enc4 != 64) {
134				output = output + String.fromCharCode(chr3);
135			}
136		}
137		output = uTF8Decode(output);
138		return output;
139	}
140});
141})(jQuery);