PrivateBin/js/base64.js
Sebastien SAUVAGE eccd4a816a base64.js updated to 2.6
From https://github.com/dankogai/js-base64

(cherry picked from commit 7e5c36ed5b7fc67ba919973834e015ce92b5708b)
2015-08-15 18:33:58 +02:00

140 lines
4.3 KiB
JavaScript

/*
* $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) {
'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 t = {};
for (var i = 0, l = bin.length; i < l; i++) t[bin.charAt(i)] = i;
return t;
}(b64chars);
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 utob = function(u) {
return u.replace(/[^\x00-\x7F]/g, cb_utob);
};
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 btoa = global.btoa || function(b) {
return b.replace(/[\s\S]{1,3}/g, cb_encode);
};
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 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 btou = function(b) {
return b.replace(re_btou, cb_btou);
};
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 = {
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);