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base64.js updated to 2.6
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From https://github.com/dankogai/js-base64
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@sebsauvage
sebsauvage committed Feb 23, 2013
1 parent 57e6274 commit 7e5c36e
Showing 1 changed file with 116 additions and 105 deletions.
221 changes: 116 additions & 105 deletions js/base64.js
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Original file line number Diff line number Diff line change
@@ -1,128 +1,139 @@
/*
* $Id: base64.js,v 1.2 2011/12/27 14:34:49 dankogai Exp dankogai $
* $Id: base64.js,v 2.6 2012/08/24 05:23:18 dankogai Exp dankogai $
*
* Licensed under the MIT license.
* http://www.opensource.org/licenses/mit-license.php
*
* References:
* http://en.wikipedia.org/wiki/Base64
*/

(function(global){

if (global.Base64) return;

var b64chars
(function(global) {
'use strict';
// if node.js, we use Buffer
var buffer;
if (typeof module !== 'undefined' && module.exports) {
buffer = require('buffer').Buffer;
}
// constants
var b64chars
= 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
var b64tab = function(bin){
var b64tab = function(bin) {
var t = {};
for (var i = 0, l = bin.length; i < l; i++) t[bin.charAt(i)] = i;
return t;
}(b64chars);

var sub_toBase64 = function(m){
var n = (m.charCodeAt(0) << 16)
| (m.charCodeAt(1) << 8)
| (m.charCodeAt(2) );
return b64chars.charAt( n >>> 18)
+ b64chars.charAt((n >>> 12) & 63)
+ b64chars.charAt((n >>> 6) & 63)
+ b64chars.charAt( n & 63);
var fromCharCode = String.fromCharCode;
// encoder stuff
var cb_utob = function(c) {
var cc = c.charCodeAt(0);
return cc < 0x80 ? c
: cc < 0x800 ? fromCharCode(0xc0 | (cc >>> 6))
+ fromCharCode(0x80 | (cc & 0x3f))
: fromCharCode(0xe0 | ((cc >>> 12) & 0x0f))
+ fromCharCode(0x80 | ((cc >>> 6) & 0x3f))
+ fromCharCode(0x80 | ( cc & 0x3f));
};

var toBase64 = function(bin){
if (bin.match(/[^\x00-\xFF]/)) throw 'unsupported character found' ;
var padlen = 0;
while(bin.length % 3) {
bin += '\0';
padlen++;
};
var b64 = bin.replace(/[\x00-\xFF]{3}/g, sub_toBase64);
if (!padlen) return b64;
b64 = b64.substr(0, b64.length - padlen);
while(padlen--) b64 += '=';
return b64;
var utob = function(u) {
return u.replace(/[^\x00-\x7F]/g, cb_utob);
};

var btoa = global.btoa || toBase64;

var sub_fromBase64 = function(m){
var n = (b64tab[ m.charAt(0) ] << 18)
| (b64tab[ m.charAt(1) ] << 12)
| (b64tab[ m.charAt(2) ] << 6)
| (b64tab[ m.charAt(3) ]);
return String.fromCharCode( n >> 16 )
+ String.fromCharCode( (n >> 8) & 0xff )
+ String.fromCharCode( n & 0xff );
var cb_encode = function(ccc) {
var padlen = [0, 2, 1][ccc.length % 3],
ord = ccc.charCodeAt(0) << 16
| ((ccc.length > 1 ? ccc.charCodeAt(1) : 0) << 8)
| ((ccc.length > 2 ? ccc.charCodeAt(2) : 0)),
chars = [
b64chars.charAt( ord >>> 18),
b64chars.charAt((ord >>> 12) & 63),
padlen >= 2 ? '=' : b64chars.charAt((ord >>> 6) & 63),
padlen >= 1 ? '=' : b64chars.charAt(ord & 63)
];
return chars.join('');
};

var fromBase64 = function(b64){
b64 = b64.replace(/[^A-Za-z0-9\+\/]/g, '');
var padlen = 0;
while(b64.length % 4){
b64 += 'A';
padlen++;
}
var bin = b64.replace(/[A-Za-z0-9\+\/]{4}/g, sub_fromBase64);
if (padlen >= 2)
bin = bin.substring(0, bin.length - [0,0,2,1][padlen]);
return bin;
var btoa = global.btoa || function(b) {
return b.replace(/[\s\S]{1,3}/g, cb_encode);
};

var atob = global.atob || fromBase64;

var re_char_nonascii = /[^\x00-\x7F]/g;

var sub_char_nonascii = function(m){
var n = m.charCodeAt(0);
return n < 0x800 ? String.fromCharCode(0xc0 | (n >>> 6))
+ String.fromCharCode(0x80 | (n & 0x3f))
: String.fromCharCode(0xe0 | ((n >>> 12) & 0x0f))
+ String.fromCharCode(0x80 | ((n >>> 6) & 0x3f))
+ String.fromCharCode(0x80 | (n & 0x3f))
;
var _encode = buffer
? function (u) { return (new buffer(u)).toString('base64') }
: function (u) { return btoa(utob(u)) }
;
var encode = function(u, urisafe) {
return !urisafe
? _encode(u)
: _encode(u).replace(/[+\/]/g, function(m0) {
return m0 == '+' ? '-' : '_';
});
};

var utob = function(uni){
return uni.replace(re_char_nonascii, sub_char_nonascii);
var encodeURI = function(u) { return encode(u, true) };
// decoder stuff
var re_btou = /[\xC0-\xDF][\x80-\xBF]|[\xE0-\xEF][\x80-\xBF]{2}/g;
var cb_btou = function(ccc) {
return fromCharCode(
ccc.length < 3 ? ((0x1f & ccc.charCodeAt(0)) << 6)
| (0x3f & ccc.charCodeAt(1))
: ((0x0f & ccc.charCodeAt(0)) << 12)
| ((0x3f & ccc.charCodeAt(1)) << 6)
| (0x3f & ccc.charCodeAt(2))
);
};

var re_bytes_nonascii
= /[\xC0-\xDF][\x80-\xBF]|[\xE0-\xEF][\x80-\xBF]{2}|[\xF0-\xF7][\x80-\xBF]{3}/g;

var sub_bytes_nonascii = function(m){
var c0 = m.charCodeAt(0);
var c1 = m.charCodeAt(1);
if(c0 < 0xe0){
return String.fromCharCode(((c0 & 0x1f) << 6) | (c1 & 0x3f));
}else{
var c2 = m.charCodeAt(2);
return String.fromCharCode(
((c0 & 0x0f) << 12) | ((c1 & 0x3f) << 6) | (c2 & 0x3f)
);
}
var btou = function(b) {
return b.replace(re_btou, cb_btou);
};

var btou = function(bin){
return bin.replace(re_bytes_nonascii, sub_bytes_nonascii);
var cb_decode = function(cccc) {
var len = cccc.length,
padlen = len % 4,
n = (len > 0 ? b64tab[cccc.charAt(0)] << 18 : 0)
| (len > 1 ? b64tab[cccc.charAt(1)] << 12 : 0)
| (len > 2 ? b64tab[cccc.charAt(2)] << 6 : 0)
| (len > 3 ? b64tab[cccc.charAt(3)] : 0),
chars = [
fromCharCode( n >>> 16),
fromCharCode((n >>> 8) & 0xff),
fromCharCode( n & 0xff)
];
chars.length -= [0, 0, 2, 1][padlen];
return chars.join('');
};

var atob = global.atob || function(a){
return a.replace(/[\s\S]{1,4}/g, cb_decode);
};
var _decode = buffer
? function(a) { return (new buffer(a, 'base64')).toString() }
: function(a) { return btou(atob(a)) }
;
var decode = function(a){
return _decode(
a.replace(/[-_]/g, function(m0) { return m0 == '-' ? '+' : '/' })
.replace(/[^A-Za-z0-9\+\/]/g, '')
);
};
// export Base64
global.Base64 = {
fromBase64:fromBase64,
toBase64:toBase64,
atob:atob,
btoa:btoa,
utob:utob,
btou:btou,
encode:function(u){ return btoa(utob(u)) },
encodeURI:function(u){
return btoa(utob(u)).replace(/[+\/]/g, function(m0){
return m0 == '+' ? '-' : '_';
}).replace(/=+$/, '');
},
decode:function(a){
return btou(atob(a.replace(/[-_]/g, function(m0){
return m0 == '-' ? '+' : '/';
})));
}
atob: atob,
btoa: btoa,
fromBase64: decode,
toBase64: encode,
utob: utob,
encode: encode,
encodeURI: encodeURI,
btou: btou,
decode: decode
};

// if ES5 is available, make Base64.extendString() available
if (typeof Object.defineProperty === 'function') {
var noEnum = function(v){
return {value:v,enumerable:false,writable:true,configurable:true};
};
global.Base64.extendString = function () {
Object.defineProperty(
String.prototype, 'fromBase64', noEnum(function () {
return decode(this)
}));
Object.defineProperty(
String.prototype, 'toBase64', noEnum(function (urisafe) {
return encode(this, urisafe)
}));
};
}
// that's it!
})(this);

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