1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// WebSafeBase64Escape and Unescape.
function B64_encode(bytes, opt_length) {
if (!opt_length) opt_length = bytes.length;
var b64out =
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_';
var result = '';
var shift = 0;
var accu = 0;
var inputIndex = 0;
while (opt_length--) {
accu <<= 8;
accu |= bytes[inputIndex++];
shift += 8;
while (shift >= 6) {
var i = (accu >> (shift - 6)) & 63;
result += b64out.charAt(i);
shift -= 6;
}
}
if (shift) {
accu <<= 8;
shift += 8;
var i = (accu >> (shift - 6)) & 63;
result += b64out.charAt(i);
}
return result;
}
// Normal base64 encode; not websafe, including padding.
function base64_encode(bytes, opt_length) {
if (!opt_length) opt_length = bytes.length;
var b64out =
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
var result = '';
var shift = 0;
var accu = 0;
var inputIndex = 0;
while (opt_length--) {
accu <<= 8;
accu |= bytes[inputIndex++];
shift += 8;
while (shift >= 6) {
var i = (accu >> (shift - 6)) & 63;
result += b64out.charAt(i);
shift -= 6;
}
}
if (shift) {
accu <<= 8;
shift += 8;
var i = (accu >> (shift - 6)) & 63;
result += b64out.charAt(i);
}
while (result.length % 4) result += '=';
return result;
}
var B64_inmap =
[
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 63, 0, 0,
53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 0, 0, 0, 0, 0, 0,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 0, 0, 0, 0, 64,
0, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41,
42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 0, 0, 0, 0, 0
];
function B64_decode(string) {
var bytes = [];
var accu = 0;
var shift = 0;
for (var i = 0; i < string.length; ++i) {
var c = string.charCodeAt(i);
if (c < 32 || c > 127 || !B64_inmap[c - 32]) return [];
accu <<= 6;
accu |= (B64_inmap[c - 32] - 1);
shift += 6;
if (shift >= 8) {
bytes.push((accu >> (shift - 8)) & 255);
shift -= 8;
}
}
return bytes;
}
|
