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Nicholas C. Zakas
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Base 64 encoding
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‎encodings/base64/base64.htm

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<html>
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<head>
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<title>Base64 Tests</title>
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<!-- Combo-handled YUI CSS files: -->
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<link rel="stylesheet" type="text/css" href="http://yui.yahooapis.com/combo?2.7.0/build/logger/assets/logger.css&2.7.0/build/yuitest/assets/testlogger.css">
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<!-- Combo-handled YUI JS files: -->
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<script type="text/javascript" src="http://yui.yahooapis.com/combo?2.7.0/build/yahoo-dom-event/yahoo-dom-event.js&2.7.0/build/logger/logger-min.js&2.7.0/build/yuitest/yuitest-min.js"></script>
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<script type="text/javascript" src="base64.js"></script>
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</head>
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<body>
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<h1>Doubly Linked List Tests</h1>
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<script type="text/javascript">
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YAHOO.namespace("test");
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YAHOO.test.Base64 = (function(){
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var assert = YAHOO.util.Assert;
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//-------------------------------------------------------------------------
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// Base Test Suite
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//-------------------------------------------------------------------------
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var suite = new YAHOO.tool.TestSuite("Base64 Tests");
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//-------------------------------------------------------------------------
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// Test Case for adding
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//-------------------------------------------------------------------------
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suite.add(new YAHOO.tool.TestCase({
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name : "Base 64 Encoding Tests",
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//---------------------------------------------------------------------
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// Tests
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//---------------------------------------------------------------------
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testMan: function(){
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var result = base64Encode("Man");
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assert.areEqual("TWFu", result);
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},
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testHelloWorld: function(){
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var result = base64Encode("Hello world");
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assert.areEqual("SGVsbG8gd29ybGQ=", result);
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},
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testPhrase: function(){
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var expected = "TWFuIGlzIGRpc3Rpbmd1aXNoZWQsIG5vdCBvbmx5IGJ5IGhpcyByZWFzb24sIGJ1dCBieSB0aGlzIHNpbmd1bGFyIHBhc3Npb24gZnJvbSBvdGhlciBhbmltYWxzLCB3aGljaCBpcyBhIGx1c3Qgb2YgdGhlIG1pbmQsIHRoYXQgYnkgYSBwZXJzZXZlcmFuY2Ugb2YgZGVsaWdodCBpbiB0aGUgY29udGludWVkIGFuZCBpbmRlZmF0aWdhYmxlIGdlbmVyYXRpb24gb2Yga25vd2xlZGdlLCBleGNlZWRzIHRoZSBzaG9ydCB2ZWhlbWVuY2Ugb2YgYW55IGNhcm5hbCBwbGVhc3VyZS4=";
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var result = base64Encode("Man is distinguished, not only by his reason, but by this singular passion from other animals, which is a lust of the mind, that by a perseverance of delight in the continued and indefatigable generation of knowledge, exceeds the short vehemence of any carnal pleasure.");
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assert.areEqual(expected, result);
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}
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}));
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//return it
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return suite;
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})();
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(function (){
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//create the logger
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var logger = new YAHOO.tool.TestLogger();
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//add the tests
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YAHOO.tool.TestRunner.add(YAHOO.test.Base64);
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YAHOO.tool.TestRunner.run();
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})();
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</script>
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</body>
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</html>

‎encodings/base64/base64.js

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/*
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* Base 64 implementation in JavaScript
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* Copyright (c) 2009 Nicholas C. Zakas. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/**
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* Base64-encodes a string of text.
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* @param {String} text The text to encode
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* @return {String} The base64-encoded string.
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*/
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function base64Encode(text){
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//helper function to left-pad an array with zeros
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function padLeft(bits, length){
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while (bits.length < length){
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bits.unshift("0");
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}
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return bits;
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}
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//helper function to right-pad an array with zeros
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function padRight(bits, length){
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while (bits.length < length){
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bits.push("0");
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}
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return bits;
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}
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//local variables
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var digits = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
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part, index,
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i=0, j=0,
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padding="",
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quantaCount,
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bits = [],
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result = [];
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//create an array of binary digits representing the text
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for (; i < text.length; i++){
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part = text.charCodeAt(i).toString(2);
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bits = bits.concat(padLeft(part.split(""), 8));
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}
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//figure out how many 24-bit quanta are in the array
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quantaCount = Math.floor(bits.length / 24);
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//encode all bits
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encodeBits: while(true){
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//must encode one complete quanta at a time
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for(i=0; i < quantaCount; i++){
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for (j=0; j < 4; j++){
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part = bits.splice(0, 6).join("");
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index = parseInt(part,2);
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result.push(digits[index]);
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}
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}
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//take care of any extra bits
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switch(bits.length){
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case 8:
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padRight(bits, 12);
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padding = "==";
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continue encodeBits;
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case 16:
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padRight(bits, 18);
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padding = "=";
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continue encodeBits;
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default:
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break encodeBits;
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}
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}
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//add any padding to the result
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result.push(padding);
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//return a string
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return result.join("");
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}

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