string-base64.html (4981B)
1 <!DOCTYPE html> 2 <head> 3 <!-- 4 Copyright (C) 2007 Apple Inc. All rights reserved. 5 6 Redistribution and use in source and binary forms, with or without 7 modification, are permitted provided that the following conditions 8 are met: 9 1. Redistributions of source code must retain the above copyright 10 notice, this list of conditions and the following disclaimer. 11 2. Redistributions in binary form must reproduce the above copyright 12 notice, this list of conditions and the following disclaimer in the 13 documentation and/or other materials provided with the distribution. 14 15 THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 16 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18 PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 19 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 20 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 22 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 23 OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 --> 27 28 <title>SunSpider string-base64</title> 29 30 </head> 31 32 <body> 33 <h3>string-base64</h3> 34 <div id="console"> 35 </div> 36 37 <script> 38 39 var _sunSpiderStartDate = new Date(); 40 41 /* This Source Code Form is subject to the terms of the Mozilla Public 42 * License, v. 2.0. If a copy of the MPL was not distributed with this 43 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 44 45 // From: http://lxr.mozilla.org/mozilla/source/extensions/xml-rpc/src/nsXmlRpcClient.js#956 46 47 /* Convert data (an array of integers) to a Base64 string. */ 48 var toBase64Table = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; 49 var base64Pad = '='; 50 51 function toBase64(data) { 52 var result = ''; 53 var length = data.length; 54 var i; 55 // Convert every three bytes to 4 ascii characters. 56 for (i = 0; i < (length - 2); i += 3) { 57 result += toBase64Table[data[i] >> 2]; 58 result += toBase64Table[((data[i] & 0x03) << 4) + (data[i+1] >> 4)]; 59 result += toBase64Table[((data[i+1] & 0x0f) << 2) + (data[i+2] >> 6)]; 60 result += toBase64Table[data[i+2] & 0x3f]; 61 } 62 63 // Convert the remaining 1 or 2 bytes, pad out to 4 characters. 64 if (length%3) { 65 i = length - (length%3); 66 result += toBase64Table[data[i] >> 2]; 67 if ((length%3) == 2) { 68 result += toBase64Table[((data[i] & 0x03) << 4) + (data[i+1] >> 4)]; 69 result += toBase64Table[(data[i+1] & 0x0f) << 2]; 70 result += base64Pad; 71 } else { 72 result += toBase64Table[(data[i] & 0x03) << 4]; 73 result += base64Pad + base64Pad; 74 } 75 } 76 77 return result; 78 } 79 80 /* Convert Base64 data to a string */ 81 var toBinaryTable = [ 82 -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, 83 -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, 84 -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63, 85 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1, 86 -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14, 87 15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1, 88 -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40, 89 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1 90 ]; 91 92 function base64ToString(data) { 93 var result = ''; 94 var leftbits = 0; // number of bits decoded, but yet to be appended 95 var leftdata = 0; // bits decoded, but yet to be appended 96 97 // Convert one by one. 98 for (var i = 0; i < data.length; i++) { 99 var c = toBinaryTable[data.charCodeAt(i) & 0x7f]; 100 var padding = (data[i] == base64Pad); 101 // Skip illegal characters and whitespace 102 if (c == -1) continue; 103 104 // Collect data into leftdata, update bitcount 105 leftdata = (leftdata << 6) | c; 106 leftbits += 6; 107 108 // If we have 8 or more bits, append 8 bits to the result 109 if (leftbits >= 8) { 110 leftbits -= 8; 111 // Append if not padding. 112 if (!padding) 113 result += String.fromCharCode((leftdata >> leftbits) & 0xff); 114 leftdata &= (1 << leftbits) - 1; 115 } 116 } 117 118 // If there are any bits left, the base64 string was corrupted 119 if (leftbits) 120 throw Components.Exception('Corrupted base64 string'); 121 122 return result; 123 } 124 125 var str = ""; 126 127 for ( var i = 0; i < 8192; i++ ) 128 str += String.fromCharCode( (25 * Math.random()) + 97 ); 129 130 for ( var i = 8192; i <= 16384; i *= 2 ) { 131 132 var base64; 133 134 base64 = toBase64(str); 135 base64ToString(base64); 136 137 // Double the string 138 str += str; 139 } 140 141 toBinaryTable = null; 142 143 144 var _sunSpiderInterval = new Date() - _sunSpiderStartDate; 145 146 document.getElementById("console").innerHTML = _sunSpiderInterval; 147 </script> 148 149 150 </body> 151 </html>