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- (function(global) {
- 'use strict'
- if (global.Base64) return
- var version = "2.1.1"
- // 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
- return t
- }(b64chars)
- var fromCharCode = String.fromCharCode
- // encoder stuff
- var cb_utob = function(c) {
- if (c.length < 2) {
- 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)))
- } else {
- var cc = 0x10000
- + (c.charCodeAt(0) - 0xD800) * 0x400
- + (c.charCodeAt(1) - 0xDC00)
- return (fromCharCode(0xf0 | ((cc >>> 18) & 0x07))
- + fromCharCode(0x80 | ((cc >>> 12) & 0x3f))
- + fromCharCode(0x80 | ((cc >>> 6) & 0x3f))
- + fromCharCode(0x80 | ( cc & 0x3f)))
- }
- }
- var re_utob = /[\uD800-\uDBFF][\uDC00-\uDFFFF]|[^\x00-\x7F]/g
- var utob = function(u) {
- return u.replace(re_utob, 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 _utf8_encode((new buffer(u)).toString('base64')) }
- : function (u) { return _utf8_encode(btoa(utob(u))) }
-
- var encode = function(u, urisafe) {
- return !urisafe
- ? _encode(u)
- : _encode(u).replace(/[+\/]/g, function(m0) {
- return m0 == '+' ? '-' : '_'
- }).replace(/=/g, '')
- }
- var encodeURI = function(u) { return encode(u, true) }
- // decoder stuff
- var re_btou = new RegExp([
- '[\xC0-\xDF][\x80-\xBF]',
- '[\xE0-\xEF][\x80-\xBF]{2}',
- '[\xF0-\xF7][\x80-\xBF]{3}'
- ].join('|'), 'g')
- var cb_btou = function(cccc) {
- switch(cccc.length) {
- case 4:
- var cp = ((0x07 & cccc.charCodeAt(0)) << 18)
- | ((0x3f & cccc.charCodeAt(1)) << 12)
- | ((0x3f & cccc.charCodeAt(2)) << 6)
- | (0x3f & cccc.charCodeAt(3)),
- offset = cp - 0x10000
- return (fromCharCode((offset >>> 10) + 0xD800)
- + fromCharCode((offset & 0x3FF) + 0xDC00))
- case 3:
- return fromCharCode(
- ((0x0f & cccc.charCodeAt(0)) << 12)
- | ((0x3f & cccc.charCodeAt(1)) << 6)
- | (0x3f & cccc.charCodeAt(2))
- )
- default:
- return fromCharCode(
- ((0x1f & cccc.charCodeAt(0)) << 6)
- | (0x3f & cccc.charCodeAt(1))
- )
- }
- }
- var _utf8_encode = function ( string ) {
- string = string.replace(/\r\n/g,"\n")
- var utftext = ""
-
- for (var n = 0
-
- var c = string.charCodeAt(n)
-
- if (c < 128) {
- utftext += String.fromCharCode(c)
- }
- else if((c > 127) && (c < 2048)) {
- utftext += String.fromCharCode((c >> 6) | 192)
- utftext += String.fromCharCode((c & 63) | 128)
- }
- else {
- utftext += String.fromCharCode((c >> 12) | 224)
- utftext += String.fromCharCode(((c >> 6) & 63) | 128)
- utftext += String.fromCharCode((c & 63) | 128)
- }
-
- }
-
- return utftext
- }
- var _utf8_decode = function (utftext) {
- var string = ""
- var i = 0
- var c = c1 = c2 = 0
-
- while ( i < utftext.length ) {
-
- c = utftext.charCodeAt(i)
-
- if (c < 128) {
- string += String.fromCharCode(c)
- i++
- }
- else if((c > 191) && (c < 224)) {
- c2 = utftext.charCodeAt(i+1)
- string += String.fromCharCode(((c & 31) << 6) | (c2 & 63))
- i += 2
- }
- else {
- c2 = utftext.charCodeAt(i+1)
- c3 = utftext.charCodeAt(i+2)
- string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63))
- i += 3
- }
-
- }
-
- return string
- }
- 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){
- a = _utf8_decode( a )
- return _decode(
- a.replace(/[-_]/g, function(m0) { return m0 == '-' ? '+' : '/' })
- .replace(/[^A-Za-z0-9\+\/]/g, '')
- )
- }
- // export Base64
- global.Base64 = {
- VERSION: version,
- 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)
- }))
- Object.defineProperty(
- String.prototype, 'toBase64URI', noEnum(function () {
- return encode(this, true)
- }))
- }
- }
- // that's it!
- })(this)
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