testing/performance/talos/page_load_test/sunspider/string-base64.html

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  27
  28 <title>SunSpider string-base64</title>
  29 <link rel="stylesheet" href="sunspider.css"></link>
  30 </head>
  31
  32 <body>
  33 <h3>string-base64</h3>
  34 <div id="console">
  35 </div>
  36 <script>
  37
  38
  39 /* ***** BEGIN LICENSE BLOCK *****
  40  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  41  *
  42  * The contents of this file are subject to the Mozilla Public License Version
  43  * 1.1 (the "License"); you may not use this file except in compliance with
  44  * the License. You may obtain a copy of the License at
  45  * http://www.mozilla.org/MPL/
  46  *
  47  * Software distributed under the License is distributed on an "AS IS" basis,
  48  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  49  * for the specific language governing rights and limitations under the
  50  * License.
  51  *
  52  * The Original Code is Mozilla XML-RPC Client component.
  53  *
  54  * The Initial Developer of the Original Code is
  55  * Digital Creations 2, Inc.
  56  * Portions created by the Initial Developer are Copyright (C) 2000
  57  * the Initial Developer. All Rights Reserved.
  58  *
  59  * Contributor(s):
  60  *   Martijn Pieters <mj@digicool.com> (original author)
  61  *   Samuel Sieb <samuel@sieb.net>
  62  *
  63  * Alternatively, the contents of this file may be used under the terms of
  64  * either the GNU General Public License Version 2 or later (the "GPL"), or
  65  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  66  * in which case the provisions of the GPL or the LGPL are applicable instead
  67  * of those above. If you wish to allow use of your version of this file only
  68  * under the terms of either the GPL or the LGPL, and not to allow others to
  69  * use your version of this file under the terms of the MPL, indicate your
  70  * decision by deleting the provisions above and replace them with the notice
  71  * and other provisions required by the GPL or the LGPL. If you do not delete
  72  * the provisions above, a recipient may use your version of this file under
  73  * the terms of any one of the MPL, the GPL or the LGPL.
  74  *
  75  * ***** END LICENSE BLOCK ***** */
  76
  77 // From: http://lxr.mozilla.org/mozilla/source/extensions/xml-rpc/src/nsXmlRpcClient.js#956
  78
  79 /* Convert data (an array of integers) to a Base64 string. */
  80 var toBase64Table = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
  81 var base64Pad = '=';
  82
  83 function toBase64(data) {
  84     var result = '';
  85     var length = data.length;
  86     var i;
  87     // Convert every three bytes to 4 ascii characters.
  88     for (i = 0; i < (length - 2); i += 3) {
  89         result += toBase64Table[data[i] >> 2];
  90         result += toBase64Table[((data[i] & 0x03) << 4) + (data[i+1] >> 4)];
  91         result += toBase64Table[((data[i+1] & 0x0f) << 2) + (data[i+2] >> 6)];
  92         result += toBase64Table[data[i+2] & 0x3f];
  93     }
  94
  95     // Convert the remaining 1 or 2 bytes, pad out to 4 characters.
  96     if (length%3) {
  97         i = length - (length%3);
  98         result += toBase64Table[data[i] >> 2];
  99         if ((length%3) == 2) {
 100             result += toBase64Table[((data[i] & 0x03) << 4) + (data[i+1] >> 4)];
 101             result += toBase64Table[(data[i+1] & 0x0f) << 2];
 102             result += base64Pad;
 103         } else {
 104             result += toBase64Table[(data[i] & 0x03) << 4];
 105             result += base64Pad + base64Pad;
 106         }
 107     }
 108
 109     return result;
 110 }
 111
 112 /* Convert Base64 data to a string */
 113 var toBinaryTable = [
 114     -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
 115     -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
 116     -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
 117     52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1,
 118     -1, 0, 1, 2,  3, 4, 5, 6,  7, 8, 9,10, 11,12,13,14,
 119     15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
 120     -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
 121     41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
 122 ];
 123
 124 function base64ToString(data) {
 125     var result = '';
 126     var leftbits = 0; // number of bits decoded, but yet to be appended
 127     var leftdata = 0; // bits decoded, but yet to be appended
 128
 129     // Convert one by one.
 130     for (var i = 0; i < data.length; i++) {
 131         var c = toBinaryTable[data.charCodeAt(i) & 0x7f];
 132         var padding = (data[i] == base64Pad);
 133         // Skip illegal characters and whitespace
 134         if (c == -1) continue;
 135
 136         // Collect data into leftdata, update bitcount
 137         leftdata = (leftdata << 6) | c;
 138         leftbits += 6;
 139
 140         // If we have 8 or more bits, append 8 bits to the result
 141         if (leftbits >= 8) {
 142             leftbits -= 8;
 143             // Append if not padding.
 144             if (!padding)
 145                 result += String.fromCharCode((leftdata >> leftbits) & 0xff);
 146             leftdata &= (1 << leftbits) - 1;
 147         }
 148     }
 149
 150     // If there are any bits left, the base64 string was corrupted
 151     if (leftbits)
 152         throw Components.Exception('Corrupted base64 string');
 153
 154     return result;
 155 }
 156
 157 var str = "";
 158
 159 for ( var i = 0; i < 8192; i++ )
 160         str += String.fromCharCode( (25 * Math.random()) + 97 );
 161
 162 for ( var i = 8192; i <= 16384; i *= 2 ) {
 163
 164     var base64;
 165
 166     base64 = toBase64(str);
 167     base64ToString(base64);
 168
 169     // Double the string
 170     str += str;
 171 }
 172
 173 toBinaryTable = null;
 174
 175
 176
 177 </script>
 178
 179
 180 </body>
 181 </html>