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1 | /* This Source Code Form is subject to the terms of the Mozilla Public |
2 | * License, v. 2.0. If a copy of the MPL was not distributed with this | |
3 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
4 | ||
5 | // From: http://hg.mozilla.org/mozilla-central/raw-file/ec10630b1a54/js/src/devtools/jint/sunspider/string-base64.js | |
b5537b60 | 6 | |
f8e9b9f1 | 7 | /*jslint white: false */ |
d595e656 | 8 | /*global console */ |
a0035359 | 9 | import * as Log from './util/logging.js'; |
d595e656 | 10 | |
6d6f0db0 | 11 | export default { |
f8e9b9f1 SR |
12 | /* Convert data (an array of integers) to a Base64 string. */ |
13 | toBase64Table : 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='.split(''), | |
14 | base64Pad : '=', | |
15 | ||
16 | encode: function (data) { | |
17 | "use strict"; | |
18 | var result = ''; | |
6d6f0db0 | 19 | var toBase64Table = this.toBase64Table; |
f8e9b9f1 SR |
20 | var length = data.length; |
21 | var lengthpad = (length % 3); | |
22 | // Convert every three bytes to 4 ascii characters. | |
23 | ||
24 | for (var i = 0; i < (length - 2); i += 3) { | |
25 | result += toBase64Table[data[i] >> 2]; | |
26 | result += toBase64Table[((data[i] & 0x03) << 4) + (data[i + 1] >> 4)]; | |
27 | result += toBase64Table[((data[i + 1] & 0x0f) << 2) + (data[i + 2] >> 6)]; | |
28 | result += toBase64Table[data[i + 2] & 0x3f]; | |
29 | } | |
b5537b60 | 30 | |
f8e9b9f1 SR |
31 | // Convert the remaining 1 or 2 bytes, pad out to 4 characters. |
32 | var j = 0; | |
33 | if (lengthpad === 2) { | |
34 | j = length - lengthpad; | |
35 | result += toBase64Table[data[j] >> 2]; | |
36 | result += toBase64Table[((data[j] & 0x03) << 4) + (data[j + 1] >> 4)]; | |
37 | result += toBase64Table[(data[j + 1] & 0x0f) << 2]; | |
38 | result += toBase64Table[64]; | |
39 | } else if (lengthpad === 1) { | |
40 | j = length - lengthpad; | |
41 | result += toBase64Table[data[j] >> 2]; | |
42 | result += toBase64Table[(data[j] & 0x03) << 4]; | |
43 | result += toBase64Table[64]; | |
44 | result += toBase64Table[64]; | |
5d8e7ec0 | 45 | } |
b5537b60 | 46 | |
f8e9b9f1 SR |
47 | return result; |
48 | }, | |
49 | ||
50 | /* Convert Base64 data to a string */ | |
51 | /* jshint -W013 */ | |
52 | toBinaryTable : [ | |
53 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, | |
54 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, | |
55 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63, | |
56 | 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1, | |
57 | -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14, | |
58 | 15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1, | |
59 | -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40, | |
60 | 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1 | |
61 | ], | |
62 | /* jshint +W013 */ | |
63 | ||
64 | decode: function (data, offset) { | |
65 | "use strict"; | |
66 | offset = typeof(offset) !== 'undefined' ? offset : 0; | |
6d6f0db0 SR |
67 | var toBinaryTable = this.toBinaryTable; |
68 | var base64Pad = this.base64Pad; | |
f8e9b9f1 SR |
69 | var result, result_length; |
70 | var leftbits = 0; // number of bits decoded, but yet to be appended | |
71 | var leftdata = 0; // bits decoded, but yet to be appended | |
72 | var data_length = data.indexOf('=') - offset; | |
73 | ||
74 | if (data_length < 0) { data_length = data.length - offset; } | |
75 | ||
76 | /* Every four characters is 3 resulting numbers */ | |
77 | result_length = (data_length >> 2) * 3 + Math.floor((data_length % 4) / 1.5); | |
78 | result = new Array(result_length); | |
79 | ||
80 | // Convert one by one. | |
81 | for (var idx = 0, i = offset; i < data.length; i++) { | |
82 | var c = toBinaryTable[data.charCodeAt(i) & 0x7f]; | |
83 | var padding = (data.charAt(i) === base64Pad); | |
84 | // Skip illegal characters and whitespace | |
85 | if (c === -1) { | |
a0035359 | 86 | Log.Error("Illegal character code " + data.charCodeAt(i) + " at position " + i); |
f8e9b9f1 SR |
87 | continue; |
88 | } | |
ae510306 | 89 | |
f8e9b9f1 SR |
90 | // Collect data into leftdata, update bitcount |
91 | leftdata = (leftdata << 6) | c; | |
92 | leftbits += 6; | |
93 | ||
94 | // If we have 8 or more bits, append 8 bits to the result | |
95 | if (leftbits >= 8) { | |
96 | leftbits -= 8; | |
97 | // Append if not padding. | |
98 | if (!padding) { | |
99 | result[idx++] = (leftdata >> leftbits) & 0xff; | |
100 | } | |
101 | leftdata &= (1 << leftbits) - 1; | |
d595e656 | 102 | } |
cc0410a3 | 103 | } |
b5537b60 | 104 | |
f8e9b9f1 SR |
105 | // If there are any bits left, the base64 string was corrupted |
106 | if (leftbits) { | |
107 | err = new Error('Corrupted base64 string'); | |
108 | err.name = 'Base64-Error'; | |
109 | throw err; | |
110 | } | |
b5537b60 | 111 | |
f8e9b9f1 SR |
112 | return result; |
113 | } | |
b5537b60 | 114 | }; /* End of Base64 namespace */ |