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b5537b60 JM |
1 | /* |
2 | * Modified from: | |
3 | * http://lxr.mozilla.org/mozilla/source/extensions/xml-rpc/src/nsXmlRpcClient.js#956 | |
4 | */ | |
cc0410a3 | 5 | |
b5537b60 JM |
6 | /* ***** BEGIN LICENSE BLOCK ***** |
7 | * Version: MPL 1.1/GPL 2.0/LGPL 2.1 | |
8 | * | |
9 | * The contents of this file are subject to the Mozilla Public License Version | |
10 | * 1.1 (the "License"); you may not use this file except in compliance with | |
11 | * the License. You may obtain a copy of the License at | |
12 | * http://www.mozilla.org/MPL/ | |
13 | * | |
14 | * Software distributed under the License is distributed on an "AS IS" basis, | |
15 | * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License | |
16 | * for the specific language governing rights and limitations under the | |
17 | * License. | |
18 | * | |
19 | * The Original Code is Mozilla XML-RPC Client component. | |
20 | * | |
21 | * The Initial Developer of the Original Code is | |
22 | * Digital Creations 2, Inc. | |
23 | * Portions created by the Initial Developer are Copyright (C) 2000 | |
24 | * the Initial Developer. All Rights Reserved. | |
25 | * | |
26 | * Contributor(s): | |
27 | * Martijn Pieters <mj@digicool.com> (original author) | |
28 | * Samuel Sieb <samuel@sieb.net> | |
29 | * | |
30 | * Alternatively, the contents of this file may be used under the terms of | |
31 | * either the GNU General Public License Version 2 or later (the "GPL"), or | |
32 | * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), | |
33 | * in which case the provisions of the GPL or the LGPL are applicable instead | |
34 | * of those above. If you wish to allow use of your version of this file only | |
35 | * under the terms of either the GPL or the LGPL, and not to allow others to | |
36 | * use your version of this file under the terms of the MPL, indicate your | |
37 | * decision by deleting the provisions above and replace them with the notice | |
38 | * and other provisions required by the GPL or the LGPL. If you do not delete | |
39 | * the provisions above, a recipient may use your version of this file under | |
40 | * the terms of any one of the MPL, the GPL or the LGPL. | |
41 | * | |
42 | * ***** END LICENSE BLOCK ***** */ | |
43 | ||
44 | Base64 = { | |
45 | ||
46 | /* Convert data (an array of integers) to a Base64 string. */ | |
47 | toBase64Table : 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/', | |
48 | base64Pad : '=', | |
49 | ||
50 | encode: function (data) { | |
51 | var result = ''; | |
52 | var chrTable = Base64.toBase64Table; | |
53 | var pad = Base64.base64Pad; | |
54 | var length = data.length; | |
55 | var i; | |
56 | // Convert every three bytes to 4 ascii characters. | |
57 | for (i = 0; i < (length - 2); i += 3) { | |
58 | result += chrTable[data[i] >> 2]; | |
59 | result += chrTable[((data[i] & 0x03) << 4) + (data[i+1] >> 4)]; | |
60 | result += chrTable[((data[i+1] & 0x0f) << 2) + (data[i+2] >> 6)]; | |
61 | result += chrTable[data[i+2] & 0x3f]; | |
62 | } | |
63 | ||
64 | // Convert the remaining 1 or 2 bytes, pad out to 4 characters. | |
65 | if (length%3) { | |
66 | i = length - (length%3); | |
67 | result += chrTable[data[i] >> 2]; | |
68 | if ((length%3) == 2) { | |
69 | result += chrTable[((data[i] & 0x03) << 4) + (data[i+1] >> 4)]; | |
70 | result += chrTable[(data[i+1] & 0x0f) << 2]; | |
71 | result += pad; | |
72 | } else { | |
73 | result += chrTable[(data[i] & 0x03) << 4]; | |
74 | result += pad + pad; | |
cc0410a3 | 75 | } |
b5537b60 JM |
76 | } |
77 | ||
78 | return result; | |
79 | }, | |
80 | ||
81 | /* Convert Base64 data to a string */ | |
82 | toBinaryTable : [ | |
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,-1, -1,-1,-1,-1, | |
85 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63, | |
86 | 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1, | |
87 | -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14, | |
88 | 15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1, | |
89 | -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40, | |
90 | 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1 | |
91 | ], | |
92 | ||
5d8e7ec0 JM |
93 | decode: function (data, offset) { |
94 | offset = typeof(offset) != 'undefined' ? offset : 0; | |
b5537b60 JM |
95 | var binTable = Base64.toBinaryTable; |
96 | var pad = Base64.base64Pad; | |
97 | var leftbits = 0; // number of bits decoded, but yet to be appended | |
98 | var leftdata = 0; // bits decoded, but yet to be appended | |
99 | ||
100 | /* Every four characters is 3 resulting numbers */ | |
5d8e7ec0 JM |
101 | var data_length = data.indexOf('=') - offset; |
102 | if (data_length < 0) data_length = data.length - offset; | |
103 | ||
ef764d3b | 104 | var result_length = (data_length >> 2) * 3 + Math.floor((data_length%4)/1.5); |
b5537b60 JM |
105 | var result = new Array(result_length); |
106 | ||
107 | // Convert one by one. | |
108 | var idx = 0; | |
5d8e7ec0 | 109 | for (var i = offset; i < data.length; i++) { |
b5537b60 JM |
110 | var c = binTable[data[i].charCodeAt(0) & 0x7f]; |
111 | var padding = (data[i] == pad); | |
112 | // Skip illegal characters and whitespace | |
5d8e7ec0 JM |
113 | if (c == -1) { |
114 | console.log("Illegal character '" + data[i].charCodeAt(0) + "'"); | |
115 | continue; | |
116 | } | |
b5537b60 JM |
117 | |
118 | // Collect data into leftdata, update bitcount | |
119 | leftdata = (leftdata << 6) | c; | |
120 | leftbits += 6; | |
121 | ||
122 | // If we have 8 or more bits, append 8 bits to the result | |
123 | if (leftbits >= 8) { | |
124 | leftbits -= 8; | |
125 | // Append if not padding. | |
126 | if (!padding) | |
127 | result[idx++] = (leftdata >> leftbits) & 0xff; | |
128 | leftdata &= (1 << leftbits) - 1; | |
cc0410a3 | 129 | } |
cc0410a3 | 130 | } |
b5537b60 JM |
131 | |
132 | // If there are any bits left, the base64 string was corrupted | |
133 | if (leftbits) | |
db504ade JM |
134 | throw {name: 'Base64-Error', |
135 | message: 'Corrupted base64 string'}; | |
b5537b60 JM |
136 | |
137 | return result; | |
cc0410a3 | 138 | } |
b5537b60 JM |
139 | |
140 | }; /* End of Base64 namespace */ |