2 * $Id: base64.js,v 2.15 2014/04/05 12:58:57 dankogai Exp dankogai $
4 * Licensed under the MIT license.
5 * http://opensource.org/licenses/mit-license
8 * http://en.wikipedia.org/wiki/Base64
13 // existing version for noConflict()
14 var _Base64 = global.Base64;
15 var version = "2.1.9";
16 // if node.js, we use Buffer
18 if (typeof module !== 'undefined' && module.exports) {
20 buffer = require('buffer').Buffer;
25 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
26 var b64tab = function(bin) {
28 for (var i = 0, l = bin.length; i < l; i++) t[bin.charAt(i)] = i;
31 var fromCharCode = String.fromCharCode;
33 var cb_utob = function(c) {
35 var cc = c.charCodeAt(0);
37 : cc < 0x800 ? (fromCharCode(0xc0 | (cc >>> 6))
38 + fromCharCode(0x80 | (cc & 0x3f)))
39 : (fromCharCode(0xe0 | ((cc >>> 12) & 0x0f))
40 + fromCharCode(0x80 | ((cc >>> 6) & 0x3f))
41 + fromCharCode(0x80 | ( cc & 0x3f)));
44 + (c.charCodeAt(0) - 0xD800) * 0x400
45 + (c.charCodeAt(1) - 0xDC00);
46 return (fromCharCode(0xf0 | ((cc >>> 18) & 0x07))
47 + fromCharCode(0x80 | ((cc >>> 12) & 0x3f))
48 + fromCharCode(0x80 | ((cc >>> 6) & 0x3f))
49 + fromCharCode(0x80 | ( cc & 0x3f)));
52 var re_utob = /[\uD800-\uDBFF][\uDC00-\uDFFFF]|[^\x00-\x7F]/g;
53 var utob = function(u) {
54 return u.replace(re_utob, cb_utob);
56 var cb_encode = function(ccc) {
57 var padlen = [0, 2, 1][ccc.length % 3],
58 ord = ccc.charCodeAt(0) << 16
59 | ((ccc.length > 1 ? ccc.charCodeAt(1) : 0) << 8)
60 | ((ccc.length > 2 ? ccc.charCodeAt(2) : 0)),
62 b64chars.charAt( ord >>> 18),
63 b64chars.charAt((ord >>> 12) & 63),
64 padlen >= 2 ? '=' : b64chars.charAt((ord >>> 6) & 63),
65 padlen >= 1 ? '=' : b64chars.charAt(ord & 63)
67 return chars.join('');
69 var btoa = global.btoa ? function(b) {
70 return global.btoa(b);
72 return b.replace(/[\s\S]{1,3}/g, cb_encode);
74 var _encode = buffer ? function (u) {
75 return (u.constructor === buffer.constructor ? u : new buffer(u))
78 : function (u) { return btoa(utob(u)) }
80 var encode = function(u, urisafe) {
83 : _encode(String(u)).replace(/[+\/]/g, function(m0) {
84 return m0 == '+' ? '-' : '_';
87 var encodeURI = function(u) { return encode(u, true) };
89 var re_btou = new RegExp([
90 '[\xC0-\xDF][\x80-\xBF]',
91 '[\xE0-\xEF][\x80-\xBF]{2}',
92 '[\xF0-\xF7][\x80-\xBF]{3}'
94 var cb_btou = function(cccc) {
97 var cp = ((0x07 & cccc.charCodeAt(0)) << 18)
98 | ((0x3f & cccc.charCodeAt(1)) << 12)
99 | ((0x3f & cccc.charCodeAt(2)) << 6)
100 | (0x3f & cccc.charCodeAt(3)),
101 offset = cp - 0x10000;
102 return (fromCharCode((offset >>> 10) + 0xD800)
103 + fromCharCode((offset & 0x3FF) + 0xDC00));
106 ((0x0f & cccc.charCodeAt(0)) << 12)
107 | ((0x3f & cccc.charCodeAt(1)) << 6)
108 | (0x3f & cccc.charCodeAt(2))
112 ((0x1f & cccc.charCodeAt(0)) << 6)
113 | (0x3f & cccc.charCodeAt(1))
117 var btou = function(b) {
118 return b.replace(re_btou, cb_btou);
120 var cb_decode = function(cccc) {
121 var len = cccc.length,
123 n = (len > 0 ? b64tab[cccc.charAt(0)] << 18 : 0)
124 | (len > 1 ? b64tab[cccc.charAt(1)] << 12 : 0)
125 | (len > 2 ? b64tab[cccc.charAt(2)] << 6 : 0)
126 | (len > 3 ? b64tab[cccc.charAt(3)] : 0),
128 fromCharCode( n >>> 16),
129 fromCharCode((n >>> 8) & 0xff),
130 fromCharCode( n & 0xff)
132 chars.length -= [0, 0, 2, 1][padlen];
133 return chars.join('');
135 var atob = global.atob ? function(a) {
136 return global.atob(a);
138 return a.replace(/[\s\S]{1,4}/g, cb_decode);
140 var _decode = buffer ? function(a) {
141 return (a.constructor === buffer.constructor
142 ? a : new buffer(a, 'base64')).toString();
144 : function(a) { return btou(atob(a)) };
145 var decode = function(a){
147 String(a).replace(/[-_]/g, function(m0) { return m0 == '-' ? '+' : '/' })
148 .replace(/[^A-Za-z0-9\+\/]/g, '')
151 var noConflict = function() {
152 var Base64 = global.Base64;
153 global.Base64 = _Base64;
165 encodeURI: encodeURI,
168 noConflict: noConflict
170 // if ES5 is available, make Base64.extendString() available
171 if (typeof Object.defineProperty === 'function') {
172 var noEnum = function(v){
173 return {value:v,enumerable:false,writable:true,configurable:true};
175 global.Base64.extendString = function () {
176 Object.defineProperty(
177 String.prototype, 'fromBase64', noEnum(function () {
180 Object.defineProperty(
181 String.prototype, 'toBase64', noEnum(function (urisafe) {
182 return encode(this, urisafe)
184 Object.defineProperty(
185 String.prototype, 'toBase64URI', noEnum(function () {
186 return encode(this, true)
191 if (global['Meteor']) {
192 Base64 = global.Base64; // for normal export in Meteor.js