diff --git a/js/base64.js b/js/base64.js index 5e197708..a2ca3827 100644 --- a/js/base64.js +++ b/js/base64.js @@ -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 utob = function(uni){ - return uni.replace(re_char_nonascii, sub_char_nonascii); -}; - -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(bin){ - return bin.replace(re_bytes_nonascii, sub_bytes_nonascii); -}; - -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){ +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 == '+' ? '-' : '_'; - }).replace(/=+$/, ''); - }, - decode:function(a){ - return btou(atob(a.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);