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git.proxmox.com Git - mirror_novnc.git/blob - core/base64.js
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/. */
5 // From: http://hg.mozilla.org/mozilla-central/raw-file/ec10630b1a54/js/src/devtools/jint/sunspider/string-base64.js
7 /*jslint white: false */
11 /* Convert data (an array of integers) to a Base64 string. */
12 toBase64Table
: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='.split(''),
15 encode: function (data
) {
18 var toBase64Table
= Base64
.toBase64Table
;
19 var length
= data
.length
;
20 var lengthpad
= (length
% 3);
21 // Convert every three bytes to 4 ascii characters.
23 for (var i
= 0; i
< (length
- 2); i
+= 3) {
24 result
+= toBase64Table
[data
[i
] >> 2];
25 result
+= toBase64Table
[((data
[i
] & 0x03) << 4) + (data
[i
+ 1] >> 4)];
26 result
+= toBase64Table
[((data
[i
+ 1] & 0x0f) << 2) + (data
[i
+ 2] >> 6)];
27 result
+= toBase64Table
[data
[i
+ 2] & 0x3f];
30 // Convert the remaining 1 or 2 bytes, pad out to 4 characters.
32 if (lengthpad
=== 2) {
33 j
= length
- lengthpad
;
34 result
+= toBase64Table
[data
[j
] >> 2];
35 result
+= toBase64Table
[((data
[j
] & 0x03) << 4) + (data
[j
+ 1] >> 4)];
36 result
+= toBase64Table
[(data
[j
+ 1] & 0x0f) << 2];
37 result
+= toBase64Table
[64];
38 } else if (lengthpad
=== 1) {
39 j
= length
- lengthpad
;
40 result
+= toBase64Table
[data
[j
] >> 2];
41 result
+= toBase64Table
[(data
[j
] & 0x03) << 4];
42 result
+= toBase64Table
[64];
43 result
+= toBase64Table
[64];
49 /* Convert Base64 data to a string */
52 -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
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,-1,62, -1,-1,-1,63,
55 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1,
56 -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14,
57 15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
58 -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
59 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
63 decode: function (data
, offset
) {
65 offset
= typeof(offset
) !== 'undefined' ? offset
: 0;
66 var toBinaryTable
= Base64
.toBinaryTable
;
67 var base64Pad
= Base64
.base64Pad
;
68 var result
, result_length
;
69 var leftbits
= 0; // number of bits decoded, but yet to be appended
70 var leftdata
= 0; // bits decoded, but yet to be appended
71 var data_length
= data
.indexOf('=') - offset
;
73 if (data_length
< 0) { data_length
= data
.length
- offset
; }
75 /* Every four characters is 3 resulting numbers */
76 result_length
= (data_length
>> 2) * 3 + Math
.floor((data_length
% 4) / 1.5);
77 result
= new Array(result_length
);
79 // Convert one by one.
80 for (var idx
= 0, i
= offset
; i
< data
.length
; i
++) {
81 var c
= toBinaryTable
[data
.charCodeAt(i
) & 0x7f];
82 var padding
= (data
.charAt(i
) === base64Pad
);
83 // Skip illegal characters and whitespace
85 console
.error("Illegal character code " + data
.charCodeAt(i
) + " at position " + i
);
89 // Collect data into leftdata, update bitcount
90 leftdata
= (leftdata
<< 6) | c
;
93 // If we have 8 or more bits, append 8 bits to the result
96 // Append if not padding.
98 result
[idx
++] = (leftdata
>> leftbits
) & 0xff;
100 leftdata
&= (1 << leftbits
) - 1;
104 // If there are any bits left, the base64 string was corrupted
106 err
= new Error('Corrupted base64 string');
107 err
.name
= 'Base64-Error';
113 }; /* End of Base64 namespace */
115 /* [module] export default Base64; */