chrome/test/data/dromaeo/tests/dromaeo-string-base64.html

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   5 /* ***** BEGIN LICENSE BLOCK *****
   6  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   7  *
   8  * The contents of this file are subject to the Mozilla Public License Version
   9  * 1.1 (the "License"); you may not use this file except in compliance with
  10  * the License. You may obtain a copy of the License at
  11  * http://www.mozilla.org/MPL/
  12  *
  13  * Software distributed under the License is distributed on an "AS IS" basis,
  14  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  15  * for the specific language governing rights and limitations under the
  16  * License.
  17  *
  18  * The Original Code is Mozilla XML-RPC Client component.
  19  *
  20  * The Initial Developer of the Original Code is
  21  * Digital Creations 2, Inc.
  22  * Portions created by the Initial Developer are Copyright (C) 2000
  23  * the Initial Developer. All Rights Reserved.
  24  *
  25  * Contributor(s):
  26  *   Martijn Pieters <mj@digicool.com> (original author)
  27  *   Samuel Sieb <samuel@sieb.net>
  28  *
  29  * Alternatively, the contents of this file may be used under the terms of
  30  * either the GNU General Public License Version 2 or later (the "GPL"), or
  31  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  32  * in which case the provisions of the GPL or the LGPL are applicable instead
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  38  * the provisions above, a recipient may use your version of this file under
  39  * the terms of any one of the MPL, the GPL or the LGPL.
  40  *
  41  * ***** END LICENSE BLOCK ***** */
  42
  43 // From: http://lxr.mozilla.org/mozilla/source/extensions/xml-rpc/src/nsXmlRpcClient.js#956
  44
  45 /* Convert data (an array of integers) to a Base64 string. */
  46 var toBase64Table = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
  47 var base64Pad = '=';
  48
  49 function toBase64(data) {
  50     var result = '';
  51     var length = data.length;
  52     var i;
  53     // Convert every three bytes to 4 ascii characters.
  54     for (i = 0; i < (length - 2); i += 3) {
  55         result += toBase64Table[data.charCodeAt(i) >> 2];
  56         result += toBase64Table[((data.charCodeAt(i) & 0x03) << 4) + (data.charCodeAt(i+1) >> 4)];
  57         result += toBase64Table[((data.charCodeAt(i+1) & 0x0f) << 2) + (data.charCodeAt(i+2) >> 6)];
  58         result += toBase64Table[data.charCodeAt(i+2) & 0x3f];
  59     }
  60
  61     // Convert the remaining 1 or 2 bytes, pad out to 4 characters.
  62     if (length%3) {
  63         i = length - (length%3);
  64         result += toBase64Table[data.charCodeAt(i) >> 2];
  65         if ((length%3) == 2) {
  66             result += toBase64Table[((data.charCodeAt(i) & 0x03) << 4) + (data.chartCodeAt(i+1) >> 4)];
  67             result += toBase64Table[(data.charCodeAt(i+1) & 0x0f) << 2];
  68             result += base64Pad;
  69         } else {
  70             result += toBase64Table[(data.charCodeAt(i) & 0x03) << 4];
  71             result += base64Pad + base64Pad;
  72         }
  73     }
  74
  75     return result;
  76 }
  77
  78 /* Convert Base64 data to a string */
  79 var toBinaryTable = [
  80     -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
  81     -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
  82     -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
  83     52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1,
  84     -1, 0, 1, 2,  3, 4, 5, 6,  7, 8, 9,10, 11,12,13,14,
  85     15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
  86     -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
  87     41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
  88 ];
  89
  90 function base64ToString(data) {
  91     var result = '';
  92     var leftbits = 0; // number of bits decoded, but yet to be appended
  93     var leftdata = 0; // bits decoded, but yet to be appended
  94
  95     // Convert one by one.
  96     for (var i = 0; i < data.length; i++) {
  97         var c = toBinaryTable[data.charCodeAt(i) & 0x7f];
  98         var padding = (data.charCodeAt(i) == base64Pad.charCodeAt(0));
  99         // Skip illegal characters and whitespace
 100         if (c == -1) continue;
 101
 102         // Collect data into leftdata, update bitcount
 103         leftdata = (leftdata << 6) | c;
 104         leftbits += 6;
 105
 106         // If we have 8 or more bits, append 8 bits to the result
 107         if (leftbits >= 8) {
 108             leftbits -= 8;
 109             // Append if not padding.
 110             if (!padding)
 111                 result += String.fromCharCode((leftdata >> leftbits) & 0xff);
 112             leftdata &= (1 << leftbits) - 1;
 113         }
 114     }
 115
 116     // If there are any bits left, the base64 string was corrupted
 117     if (leftbits)
 118         throw Components.Exception('Corrupted base64 string');
 119
 120     return result;
 121 }
 122
 123 window.onload = function(){ startTest("dromaeo-string-base64", '09340c18');
 124
 125 var str = [];
 126
 127 for ( var i = 0; i < 4096; i++ )
 128         str.push( String.fromCharCode( (25 * Math.random()) + 97 ) );
 129
 130 str = str.join("");
 131 str += str;
 132 str += str;
 133
 134 var base64;
 135
 136 test( "Convert String to Base 64", function(){
 137         base64 = toBase64(str);
 138 });
 139
 140 prep(function(){
 141         if ( !base64 )
 142                 base64 = toBase64(str);
 143 });
 144
 145 test( "Convert Base 64 to String", function(){
 146         if ( str !== base64ToString(base64) ) {
 147                 throw "String conversion mis-match.";
 148         }
 149 });
 150
 151 endTest(); };
 152 </script>
 153 </head>
 154 <body></body>
 155 </html>