diff --git a/js/base64.js b/js/base64.js index a2ca382..27784eb 100644 --- a/js/base64.js +++ b/js/base64.js @@ -1,5 +1,5 @@ /* - * $Id: base64.js,v 2.6 2012/08/24 05:23:18 dankogai Exp dankogai $ + * $Id: base64.js,v 1.7 2012/08/23 10:30:18 dankogai Exp dankogai $ * * Licensed under the MIT license. * http://www.opensource.org/licenses/mit-license.php @@ -8,132 +8,230 @@ * 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 +(function(global){ + var b64chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; -var b64tab = function(bin) { + +var b64charcodes = function(){ + var a = []; + var codeA = 'A'.charCodeAt(0); + var codea = 'a'.charCodeAt(0); + var code0 = '0'.charCodeAt(0); + for (var i = 0; i < 26; i ++) a.push(codeA + i); + for (var i = 0; i < 26; i ++) a.push(codea + i); + for (var i = 0; i < 10; i ++) a.push(code0 + i); + a.push('+'.charCodeAt(0)); + a.push('/'.charCodeAt(0)); + return a; +}(); + +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 stringToArray = function(s){ + var a = []; + for (var i = 0, l = s.length; i < l; i ++) a[i] = s.charCodeAt(i); + return a; }; -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}; + +var convertUTF8ArrayToBase64 = function(bin){ + var padlen = 0; + while (bin.length % 3){ + bin.push(0); + padlen++; }; - 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) - })); + var b64 = []; + for (var i = 0, l = bin.length; i < l; i += 3){ + var c0 = bin[i], c1 = bin[i+1], c2 = bin[i+2]; + if (c0 >= 256 || c1 >= 256 || c2 >= 256) + throw 'unsupported character found'; + var n = (c0 << 16) | (c1 << 8) | c2; + b64.push( + b64charcodes[ n >>> 18], + b64charcodes[(n >>> 12) & 63], + b64charcodes[(n >>> 6) & 63], + b64charcodes[ n & 63] + ); + } + while (padlen--) b64[b64.length - padlen - 1] = '='.charCodeAt(0); + return chunkStringFromCharCodeApply(b64); +}; + +var convertBase64ToUTF8Array = function(b64){ + b64 = b64.replace(/[^A-Za-z0-9+\/]+/g, ''); + var bin = []; + var padlen = b64.length % 4; + for (var i = 0, l = b64.length; i < l; i += 4){ + var n = ((b64tab[b64.charAt(i )] || 0) << 18) + | ((b64tab[b64.charAt(i+1)] || 0) << 12) + | ((b64tab[b64.charAt(i+2)] || 0) << 6) + | ((b64tab[b64.charAt(i+3)] || 0)); + bin.push( + ( n >> 16 ), + ( (n >> 8) & 0xff ), + ( n & 0xff ) + ); + } + bin.length -= [0,0,2,1][padlen]; + return bin; +}; + +var convertUTF16ArrayToUTF8Array = function(uni){ + var bin = []; + for (var i = 0, l = uni.length; i < l; i++){ + var n = uni[i]; + if (n < 0x80) + bin.push(n); + else if (n < 0x800) + bin.push( + 0xc0 | (n >>> 6), + 0x80 | (n & 0x3f)); + else + bin.push( + 0xe0 | ((n >>> 12) & 0x0f), + 0x80 | ((n >>> 6) & 0x3f), + 0x80 | (n & 0x3f)); + } + return bin; +}; + +var convertUTF8ArrayToUTF16Array = function(bin){ + var uni = []; + for (var i = 0, l = bin.length; i < l; i++){ + var c0 = bin[i]; + if (c0 < 0x80){ + uni.push(c0); + }else{ + var c1 = bin[++i]; + if (c0 < 0xe0){ + uni.push(((c0 & 0x1f) << 6) | (c1 & 0x3f)); + }else{ + var c2 = bin[++i]; + uni.push( + ((c0 & 0x0f) << 12) | ((c1 & 0x3f) << 6) | (c2 & 0x3f) + ); + } + } + } + return uni; +}; + +var convertUTF8StringToBase64 = function(bin){ + return convertUTF8ArrayToBase64(stringToArray(bin)); +}; + +var convertBase64ToUTF8String = function(b64){ + return chunkStringFromCharCodeApply(convertBase64ToUTF8Array(b64)); +}; + +var convertUTF8StringToUTF16Array = function(bin){ + return convertUTF8ArrayToUTF16Array(stringToArray(bin)); +}; + +var convertUTF8ArrayToUTF16String = function(bin){ + return chunkStringFromCharCodeApply(convertUTF8ArrayToUTF16Array(bin)); +}; + +var convertUTF8StringToUTF16String = function(bin){ + return chunkStringFromCharCodeApply( + convertUTF8ArrayToUTF16Array(stringToArray(bin)) + ); +}; + +var convertUTF16StringToUTF8Array = function(uni){ + return convertUTF16ArrayToUTF8Array(stringToArray(uni)); +}; + +var convertUTF16ArrayToUTF8String = function(uni){ + return chunkStringFromCharCodeApply(convertUTF16ArrayToUTF8Array(uni)); +}; + +var convertUTF16StringToUTF8String = function(uni){ + return chunkStringFromCharCodeApply( + convertUTF16ArrayToUTF8Array(stringToArray(uni)) + ); +}; + +/* + * String.fromCharCode.apply will only handle arrays as big as 65536, + * after that it'll return a truncated string with no warning. + */ +var chunkStringFromCharCodeApply = function(arr){ + var strs = [], i; + for (i = 0; i < arr.length; i += 65536){ + strs.push(String.fromCharCode.apply(String, arr.slice(i, i+65536))); + } + return strs.join(''); +}; + +if (global.btoa){ + var btoa = global.btoa; + var convertUTF16StringToBase64 = function (uni){ + return btoa(convertUTF16StringToUTF8String(uni)); }; } -// that's it! +else { + var btoa = convertUTF8StringToBase64; + var convertUTF16StringToBase64 = function (uni){ + return convertUTF8ArrayToBase64(convertUTF16StringToUTF8Array(uni)); + }; +} + +if (global.atob){ + var atob = global.atob; + var convertBase64ToUTF16String = function (b64){ + return convertUTF8StringToUTF16String(atob(b64)); + }; +} +else { + var atob = convertBase64ToUTF8String; + var convertBase64ToUTF16String = function (b64){ + return convertUTF8ArrayToUTF16String(convertBase64ToUTF8Array(b64)); + }; +} + +global.Base64 = { + convertUTF8ArrayToBase64:convertUTF8ArrayToBase64, + convertByteArrayToBase64:convertUTF8ArrayToBase64, + convertBase64ToUTF8Array:convertBase64ToUTF8Array, + convertBase64ToByteArray:convertBase64ToUTF8Array, + convertUTF16ArrayToUTF8Array:convertUTF16ArrayToUTF8Array, + convertUTF16ArrayToByteArray:convertUTF16ArrayToUTF8Array, + convertUTF8ArrayToUTF16Array:convertUTF8ArrayToUTF16Array, + convertByteArrayToUTF16Array:convertUTF8ArrayToUTF16Array, + convertUTF8StringToBase64:convertUTF8StringToBase64, + convertBase64ToUTF8String:convertBase64ToUTF8String, + convertUTF8StringToUTF16Array:convertUTF8StringToUTF16Array, + convertUTF8ArrayToUTF16String:convertUTF8ArrayToUTF16String, + convertByteArrayToUTF16String:convertUTF8ArrayToUTF16String, + convertUTF8StringToUTF16String:convertUTF8StringToUTF16String, + convertUTF16StringToUTF8Array:convertUTF16StringToUTF8Array, + convertUTF16StringToByteArray:convertUTF16StringToUTF8Array, + convertUTF16ArrayToUTF8String:convertUTF16ArrayToUTF8String, + convertUTF16StringToUTF8String:convertUTF16StringToUTF8String, + convertUTF16StringToBase64:convertUTF16StringToBase64, + convertBase64ToUTF16String:convertBase64ToUTF16String, + fromBase64:convertBase64ToUTF8String, + toBase64:convertUTF8StringToBase64, + atob:atob, + btoa:btoa, + utob:convertUTF16StringToUTF8String, + btou:convertUTF8StringToUTF16String, + encode:convertUTF16StringToBase64, + encodeURI:function(u){ + return convertUTF16StringToBase64(u).replace(/[+\/]/g, function(m0){ + return m0 == '+' ? '-' : '_'; + }).replace(/=+$/, ''); + }, + decode:function(a){ + return convertBase64ToUTF16String(a.replace(/[-_]/g, function(m0){ + return m0 == '-' ? '+' : '/'; + })); + } +}; + })(this);