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1 <!DOCTYPE html> | 1 <!DOCTYPE html> |
2 <!-- | 2 <!-- |
3 Copyright (c) 2014 The Chromium Authors. All rights reserved. | 3 Copyright (c) 2014 The Chromium Authors. All rights reserved. |
4 Use of this source code is governed by a BSD-style license that can be | 4 Use of this source code is governed by a BSD-style license that can be |
5 found in the LICENSE file. | 5 found in the LICENSE file. |
6 --> | 6 --> |
7 <link rel="import" href="/tracing/base/base.html"> | 7 <link rel="import" href="/tracing/base/base.html"> |
8 <script> | 8 <script> |
9 'use strict'; | 9 'use strict'; |
10 | 10 |
11 tr.exportTo('tr.b', function() { | 11 tr.exportTo('tr.b', function() { |
12 function Base64() { | 12 function Base64() { |
13 } | 13 } |
14 | 14 |
15 function b64ToUint6(nChr) { | 15 function b64ToUint6(nChr) { |
16 if (nChr > 64 && nChr < 91) | 16 if (nChr > 64 && nChr < 91) return nChr - 65; |
17 return nChr - 65; | 17 if (nChr > 96 && nChr < 123) return nChr - 71; |
18 if (nChr > 96 && nChr < 123) | 18 if (nChr > 47 && nChr < 58) return nChr + 4; |
19 return nChr - 71; | 19 if (nChr === 43) return 62; |
20 if (nChr > 47 && nChr < 58) | 20 if (nChr === 47) return 63; |
21 return nChr + 4; | |
22 if (nChr === 43) | |
23 return 62; | |
24 if (nChr === 47) | |
25 return 63; | |
26 return 0; | 21 return 0; |
27 } | 22 } |
28 | 23 |
29 Base64.getDecodedBufferLength = function(input) { | 24 Base64.getDecodedBufferLength = function(input) { |
30 return input.length * 3 + 1 >> 2; | 25 return input.length * 3 + 1 >> 2; |
31 }; | 26 }; |
32 | 27 |
33 Base64.EncodeArrayBufferToString = function(input) { | 28 Base64.EncodeArrayBufferToString = function(input) { |
34 // http://stackoverflow.com/questions/9267899/ | 29 // http://stackoverflow.com/questions/9267899/ |
35 var binary = ''; | 30 var binary = ''; |
36 var bytes = new Uint8Array(input); | 31 var bytes = new Uint8Array(input); |
37 var len = bytes.byteLength; | 32 var len = bytes.byteLength; |
38 for (var i = 0; i < len; i++) | 33 for (var i = 0; i < len; i++) { |
39 binary += String.fromCharCode(bytes[i]); | 34 binary += String.fromCharCode(bytes[i]); |
| 35 } |
40 return btoa(binary); | 36 return btoa(binary); |
41 }; | 37 }; |
42 | 38 |
43 Base64.DecodeToTypedArray = function(input, output) { | 39 Base64.DecodeToTypedArray = function(input, output) { |
44 var nInLen = input.length; | 40 var nInLen = input.length; |
45 var nOutLen = nInLen * 3 + 1 >> 2; | 41 var nOutLen = nInLen * 3 + 1 >> 2; |
46 var nMod3 = 0; | 42 var nMod3 = 0; |
47 var nMod4 = 0; | 43 var nMod4 = 0; |
48 var nUint24 = 0; | 44 var nUint24 = 0; |
49 var nOutIdx = 0; | 45 var nOutIdx = 0; |
50 | 46 |
51 if (nOutLen > output.byteLength) | 47 if (nOutLen > output.byteLength) { |
52 throw new Error('Output buffer too small to decode.'); | 48 throw new Error('Output buffer too small to decode.'); |
| 49 } |
53 | 50 |
54 for (var nInIdx = 0; nInIdx < nInLen; nInIdx++) { | 51 for (var nInIdx = 0; nInIdx < nInLen; nInIdx++) { |
55 nMod4 = nInIdx & 3; | 52 nMod4 = nInIdx & 3; |
56 nUint24 |= b64ToUint6(input.charCodeAt(nInIdx)) << 18 - 6 * nMod4; | 53 nUint24 |= b64ToUint6(input.charCodeAt(nInIdx)) << 18 - 6 * nMod4; |
57 if (nMod4 === 3 || nInLen - nInIdx === 1) { | 54 if (nMod4 === 3 || nInLen - nInIdx === 1) { |
58 for (nMod3 = 0; nMod3 < 3 && nOutIdx < nOutLen; nMod3++, nOutIdx++) { | 55 for (nMod3 = 0; nMod3 < 3 && nOutIdx < nOutLen; nMod3++, nOutIdx++) { |
59 output.setUint8(nOutIdx, nUint24 >>> (16 >>> nMod3 & 24) & 255); | 56 output.setUint8(nOutIdx, nUint24 >>> (16 >>> nMod3 & 24) & 255); |
60 } | 57 } |
61 nUint24 = 0; | 58 nUint24 = 0; |
62 } | 59 } |
(...skipping 19 matching lines...) Expand all Loading... |
82 */ | 79 */ |
83 Base64.atob = function(input) { | 80 Base64.atob = function(input) { |
84 return atob(input); | 81 return atob(input); |
85 }; | 82 }; |
86 | 83 |
87 return { | 84 return { |
88 Base64, | 85 Base64, |
89 }; | 86 }; |
90 }); | 87 }); |
91 </script> | 88 </script> |
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