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base64.js updated to 2.6
From https://github.com/dankogai/js-base64
1 parent 57e6274 commit 7e5c36e

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Lines changed: 116 additions & 105 deletions

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‎js/base64.js‎

Lines changed: 116 additions & 105 deletions
Original file line numberDiff line numberDiff line change
@@ -1,128 +1,139 @@
11
/*
2-
* $Id: base64.js,v 1.2 2011/12/27 14:34:49 dankogai Exp dankogai $
2+
* $Id: base64.js,v 2.6 2012/08/24 05:23:18 dankogai Exp dankogai $
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*
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* Licensed under the MIT license.
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* http://www.opensource.org/licenses/mit-license.php
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*
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* References:
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* http://en.wikipedia.org/wiki/Base64
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*/
810

9-
(function(global){
10-
11-
if (global.Base64) return;
12-
13-
var b64chars
11+
(function(global) {
12+
'use strict';
13+
// if node.js, we use Buffer
14+
var buffer;
15+
if (typeof module !== 'undefined' && module.exports) {
16+
buffer = require('buffer').Buffer;
17+
}
18+
// constants
19+
var b64chars
1420
= 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
15-
var b64tab = function(bin){
21+
var b64tab = function(bin) {
1622
var t = {};
1723
for (var i = 0, l = bin.length; i < l; i++) t[bin.charAt(i)] = i;
1824
return t;
1925
}(b64chars);
20-
21-
var sub_toBase64 = function(m){
22-
var n = (m.charCodeAt(0) << 16)
23-
| (m.charCodeAt(1) << 8)
24-
| (m.charCodeAt(2) );
25-
return b64chars.charAt( n >>> 18)
26-
+ b64chars.charAt((n >>> 12) & 63)
27-
+ b64chars.charAt((n >>> 6) & 63)
28-
+ b64chars.charAt( n & 63);
26+
var fromCharCode = String.fromCharCode;
27+
// encoder stuff
28+
var cb_utob = function(c) {
29+
var cc = c.charCodeAt(0);
30+
return cc < 0x80 ? c
31+
: cc < 0x800 ? fromCharCode(0xc0 | (cc >>> 6))
32+
+ fromCharCode(0x80 | (cc & 0x3f))
33+
: fromCharCode(0xe0 | ((cc >>> 12) & 0x0f))
34+
+ fromCharCode(0x80 | ((cc >>> 6) & 0x3f))
35+
+ fromCharCode(0x80 | ( cc & 0x3f));
2936
};
30-
31-
var toBase64 = function(bin){
32-
if (bin.match(/[^\x00-\xFF]/)) throw 'unsupported character found' ;
33-
var padlen = 0;
34-
while(bin.length % 3) {
35-
bin += '\0';
36-
padlen++;
37-
};
38-
var b64 = bin.replace(/[\x00-\xFF]{3}/g, sub_toBase64);
39-
if (!padlen) return b64;
40-
b64 = b64.substr(0, b64.length - padlen);
41-
while(padlen--) b64 += '=';
42-
return b64;
37+
var utob = function(u) {
38+
return u.replace(/[^\x00-\x7F]/g, cb_utob);
4339
};
44-
45-
var btoa = global.btoa || toBase64;
46-
47-
var sub_fromBase64 = function(m){
48-
var n = (b64tab[ m.charAt(0) ] << 18)
49-
| (b64tab[ m.charAt(1) ] << 12)
50-
| (b64tab[ m.charAt(2) ] << 6)
51-
| (b64tab[ m.charAt(3) ]);
52-
return String.fromCharCode( n >> 16 )
53-
+ String.fromCharCode( (n >> 8) & 0xff )
54-
+ String.fromCharCode( n & 0xff );
40+
var cb_encode = function(ccc) {
41+
var padlen = [0, 2, 1][ccc.length % 3],
42+
ord = ccc.charCodeAt(0) << 16
43+
| ((ccc.length > 1 ? ccc.charCodeAt(1) : 0) << 8)
44+
| ((ccc.length > 2 ? ccc.charCodeAt(2) : 0)),
45+
chars = [
46+
b64chars.charAt( ord >>> 18),
47+
b64chars.charAt((ord >>> 12) & 63),
48+
padlen >= 2 ? '=' : b64chars.charAt((ord >>> 6) & 63),
49+
padlen >= 1 ? '=' : b64chars.charAt(ord & 63)
50+
];
51+
return chars.join('');
5552
};
56-
57-
var fromBase64 = function(b64){
58-
b64 = b64.replace(/[^A-Za-z0-9\+\/]/g, '');
59-
var padlen = 0;
60-
while(b64.length % 4){
61-
b64 += 'A';
62-
padlen++;
63-
}
64-
var bin = b64.replace(/[A-Za-z0-9\+\/]{4}/g, sub_fromBase64);
65-
if (padlen >= 2)
66-
bin = bin.substring(0, bin.length - [0,0,2,1][padlen]);
67-
return bin;
53+
var btoa = global.btoa || function(b) {
54+
return b.replace(/[\s\S]{1,3}/g, cb_encode);
6855
};
69-
70-
var atob = global.atob || fromBase64;
71-
72-
var re_char_nonascii = /[^\x00-\x7F]/g;
73-
74-
var sub_char_nonascii = function(m){
75-
var n = m.charCodeAt(0);
76-
return n < 0x800 ? String.fromCharCode(0xc0 | (n >>> 6))
77-
+ String.fromCharCode(0x80 | (n & 0x3f))
78-
: String.fromCharCode(0xe0 | ((n >>> 12) & 0x0f))
79-
+ String.fromCharCode(0x80 | ((n >>> 6) & 0x3f))
80-
+ String.fromCharCode(0x80 | (n & 0x3f))
81-
;
56+
var _encode = buffer
57+
? function (u) { return (new buffer(u)).toString('base64') }
58+
: function (u) { return btoa(utob(u)) }
59+
;
60+
var encode = function(u, urisafe) {
61+
return !urisafe
62+
? _encode(u)
63+
: _encode(u).replace(/[+\/]/g, function(m0) {
64+
return m0 == '+' ? '-' : '_';
65+
});
8266
};
83-
84-
var utob = function(uni){
85-
return uni.replace(re_char_nonascii, sub_char_nonascii);
67+
var encodeURI = function(u) { return encode(u, true) };
68+
// decoder stuff
69+
var re_btou = /[\xC0-\xDF][\x80-\xBF]|[\xE0-\xEF][\x80-\xBF]{2}/g;
70+
var cb_btou = function(ccc) {
71+
return fromCharCode(
72+
ccc.length < 3 ? ((0x1f & ccc.charCodeAt(0)) << 6)
73+
| (0x3f & ccc.charCodeAt(1))
74+
: ((0x0f & ccc.charCodeAt(0)) << 12)
75+
| ((0x3f & ccc.charCodeAt(1)) << 6)
76+
| (0x3f & ccc.charCodeAt(2))
77+
);
8678
};
87-
88-
var re_bytes_nonascii
89-
= /[\xC0-\xDF][\x80-\xBF]|[\xE0-\xEF][\x80-\xBF]{2}|[\xF0-\xF7][\x80-\xBF]{3}/g;
90-
91-
var sub_bytes_nonascii = function(m){
92-
var c0 = m.charCodeAt(0);
93-
var c1 = m.charCodeAt(1);
94-
if(c0 < 0xe0){
95-
return String.fromCharCode(((c0 & 0x1f) << 6) | (c1 & 0x3f));
96-
}else{
97-
var c2 = m.charCodeAt(2);
98-
return String.fromCharCode(
99-
((c0 & 0x0f) << 12) | ((c1 & 0x3f) << 6) | (c2 & 0x3f)
100-
);
101-
}
79+
var btou = function(b) {
80+
return b.replace(re_btou, cb_btou);
10281
};
103-
104-
var btou = function(bin){
105-
return bin.replace(re_bytes_nonascii, sub_bytes_nonascii);
82+
var cb_decode = function(cccc) {
83+
var len = cccc.length,
84+
padlen = len % 4,
85+
n = (len > 0 ? b64tab[cccc.charAt(0)] << 18 : 0)
86+
| (len > 1 ? b64tab[cccc.charAt(1)] << 12 : 0)
87+
| (len > 2 ? b64tab[cccc.charAt(2)] << 6 : 0)
88+
| (len > 3 ? b64tab[cccc.charAt(3)] : 0),
89+
chars = [
90+
fromCharCode( n >>> 16),
91+
fromCharCode((n >>> 8) & 0xff),
92+
fromCharCode( n & 0xff)
93+
];
94+
chars.length -= [0, 0, 2, 1][padlen];
95+
return chars.join('');
10696
};
107-
97+
var atob = global.atob || function(a){
98+
return a.replace(/[\s\S]{1,4}/g, cb_decode);
99+
};
100+
var _decode = buffer
101+
? function(a) { return (new buffer(a, 'base64')).toString() }
102+
: function(a) { return btou(atob(a)) }
103+
;
104+
var decode = function(a){
105+
return _decode(
106+
a.replace(/[-_]/g, function(m0) { return m0 == '-' ? '+' : '/' })
107+
.replace(/[^A-Za-z0-9\+\/]/g, '')
108+
);
109+
};
110+
// export Base64
108111
global.Base64 = {
109-
fromBase64:fromBase64,
110-
toBase64:toBase64,
111-
atob:atob,
112-
btoa:btoa,
113-
utob:utob,
114-
btou:btou,
115-
encode:function(u){ return btoa(utob(u)) },
116-
encodeURI:function(u){
117-
return btoa(utob(u)).replace(/[+\/]/g, function(m0){
118-
return m0 == '+' ? '-' : '_';
119-
}).replace(/=+$/, '');
120-
},
121-
decode:function(a){
122-
return btou(atob(a.replace(/[-_]/g, function(m0){
123-
return m0 == '-' ? '+' : '/';
124-
})));
125-
}
112+
atob: atob,
113+
btoa: btoa,
114+
fromBase64: decode,
115+
toBase64: encode,
116+
utob: utob,
117+
encode: encode,
118+
encodeURI: encodeURI,
119+
btou: btou,
120+
decode: decode
126121
};
127-
122+
// if ES5 is available, make Base64.extendString() available
123+
if (typeof Object.defineProperty === 'function') {
124+
var noEnum = function(v){
125+
return {value:v,enumerable:false,writable:true,configurable:true};
126+
};
127+
global.Base64.extendString = function () {
128+
Object.defineProperty(
129+
String.prototype, 'fromBase64', noEnum(function () {
130+
return decode(this)
131+
}));
132+
Object.defineProperty(
133+
String.prototype, 'toBase64', noEnum(function (urisafe) {
134+
return encode(this, urisafe)
135+
}));
136+
};
137+
}
138+
// that's it!
128139
})(this);

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