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231 lines
8.0 KiB
231 lines
8.0 KiB
/* |
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* base64.js |
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* |
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* Licensed under the BSD 3-Clause License. |
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* http://opensource.org/licenses/BSD-3-Clause |
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* |
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* References: |
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* http://en.wikipedia.org/wiki/Base64 |
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*/ |
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;(function (global, factory) { |
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typeof exports === 'object' && typeof module !== 'undefined' |
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? module.exports = factory(global) |
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: typeof define === 'function' && define.amd |
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? define(factory) : factory(global) |
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}(( |
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typeof self !== 'undefined' ? self |
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: typeof window !== 'undefined' ? window |
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: typeof global !== 'undefined' ? global |
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: this |
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), function(global) { |
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'use strict'; |
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// existing version for noConflict() |
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var _Base64 = global.Base64; |
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var version = "2.4.9"; |
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// if node.js and NOT React Native, we use Buffer |
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var buffer; |
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if (typeof module !== 'undefined' && module.exports) { |
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try { |
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buffer = eval("require('buffer').Buffer"); |
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} catch (err) { |
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buffer = undefined; |
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} |
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} |
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// constants |
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var b64chars |
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= 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; |
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var b64tab = function(bin) { |
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var t = {}; |
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for (var i = 0, l = bin.length; i < l; i++) t[bin.charAt(i)] = i; |
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return t; |
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}(b64chars); |
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var fromCharCode = String.fromCharCode; |
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// encoder stuff |
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var cb_utob = function(c) { |
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if (c.length < 2) { |
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var cc = c.charCodeAt(0); |
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return cc < 0x80 ? c |
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: cc < 0x800 ? (fromCharCode(0xc0 | (cc >>> 6)) |
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+ fromCharCode(0x80 | (cc & 0x3f))) |
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: (fromCharCode(0xe0 | ((cc >>> 12) & 0x0f)) |
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+ fromCharCode(0x80 | ((cc >>> 6) & 0x3f)) |
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+ fromCharCode(0x80 | ( cc & 0x3f))); |
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} else { |
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var cc = 0x10000 |
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+ (c.charCodeAt(0) - 0xD800) * 0x400 |
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+ (c.charCodeAt(1) - 0xDC00); |
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return (fromCharCode(0xf0 | ((cc >>> 18) & 0x07)) |
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+ fromCharCode(0x80 | ((cc >>> 12) & 0x3f)) |
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+ fromCharCode(0x80 | ((cc >>> 6) & 0x3f)) |
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+ fromCharCode(0x80 | ( cc & 0x3f))); |
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} |
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}; |
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var re_utob = /[\uD800-\uDBFF][\uDC00-\uDFFFF]|[^\x00-\x7F]/g; |
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var utob = function(u) { |
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return u.replace(re_utob, cb_utob); |
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}; |
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var cb_encode = function(ccc) { |
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var padlen = [0, 2, 1][ccc.length % 3], |
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ord = ccc.charCodeAt(0) << 16 |
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| ((ccc.length > 1 ? ccc.charCodeAt(1) : 0) << 8) |
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| ((ccc.length > 2 ? ccc.charCodeAt(2) : 0)), |
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chars = [ |
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b64chars.charAt( ord >>> 18), |
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b64chars.charAt((ord >>> 12) & 63), |
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padlen >= 2 ? '=' : b64chars.charAt((ord >>> 6) & 63), |
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padlen >= 1 ? '=' : b64chars.charAt(ord & 63) |
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]; |
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return chars.join(''); |
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}; |
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var btoa = global.btoa ? function(b) { |
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return global.btoa(b); |
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} : function(b) { |
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return b.replace(/[\s\S]{1,3}/g, cb_encode); |
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}; |
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var _encode = buffer ? |
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buffer.from && Uint8Array && buffer.from !== Uint8Array.from |
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? function (u) { |
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return (u.constructor === buffer.constructor ? u : buffer.from(u)) |
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.toString('base64') |
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} |
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: function (u) { |
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return (u.constructor === buffer.constructor ? u : new buffer(u)) |
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.toString('base64') |
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} |
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: function (u) { return btoa(utob(u)) } |
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; |
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var encode = function(u, urisafe) { |
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return !urisafe |
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? _encode(String(u)) |
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: _encode(String(u)).replace(/[+\/]/g, function(m0) { |
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return m0 == '+' ? '-' : '_'; |
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}).replace(/=/g, ''); |
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}; |
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var encodeURI = function(u) { return encode(u, true) }; |
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// decoder stuff |
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var re_btou = new RegExp([ |
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'[\xC0-\xDF][\x80-\xBF]', |
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'[\xE0-\xEF][\x80-\xBF]{2}', |
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'[\xF0-\xF7][\x80-\xBF]{3}' |
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].join('|'), 'g'); |
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var cb_btou = function(cccc) { |
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switch(cccc.length) { |
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case 4: |
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var cp = ((0x07 & cccc.charCodeAt(0)) << 18) |
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| ((0x3f & cccc.charCodeAt(1)) << 12) |
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| ((0x3f & cccc.charCodeAt(2)) << 6) |
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| (0x3f & cccc.charCodeAt(3)), |
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offset = cp - 0x10000; |
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return (fromCharCode((offset >>> 10) + 0xD800) |
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+ fromCharCode((offset & 0x3FF) + 0xDC00)); |
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case 3: |
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return fromCharCode( |
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((0x0f & cccc.charCodeAt(0)) << 12) |
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| ((0x3f & cccc.charCodeAt(1)) << 6) |
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| (0x3f & cccc.charCodeAt(2)) |
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); |
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default: |
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return fromCharCode( |
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((0x1f & cccc.charCodeAt(0)) << 6) |
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| (0x3f & cccc.charCodeAt(1)) |
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); |
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} |
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}; |
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var btou = function(b) { |
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return b.replace(re_btou, cb_btou); |
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}; |
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var cb_decode = function(cccc) { |
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var len = cccc.length, |
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padlen = len % 4, |
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n = (len > 0 ? b64tab[cccc.charAt(0)] << 18 : 0) |
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| (len > 1 ? b64tab[cccc.charAt(1)] << 12 : 0) |
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| (len > 2 ? b64tab[cccc.charAt(2)] << 6 : 0) |
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| (len > 3 ? b64tab[cccc.charAt(3)] : 0), |
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chars = [ |
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fromCharCode( n >>> 16), |
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fromCharCode((n >>> 8) & 0xff), |
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fromCharCode( n & 0xff) |
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]; |
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chars.length -= [0, 0, 2, 1][padlen]; |
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return chars.join(''); |
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}; |
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var atob = global.atob ? function(a) { |
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return global.atob(a); |
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} : function(a){ |
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return a.replace(/[\s\S]{1,4}/g, cb_decode); |
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}; |
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var _decode = buffer ? |
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buffer.from && Uint8Array && buffer.from !== Uint8Array.from |
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? function(a) { |
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return (a.constructor === buffer.constructor |
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? a : buffer.from(a, 'base64')).toString(); |
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} |
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: function(a) { |
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return (a.constructor === buffer.constructor |
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? a : new buffer(a, 'base64')).toString(); |
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} |
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: function(a) { return btou(atob(a)) }; |
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var decode = function(a){ |
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return _decode( |
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String(a).replace(/[-_]/g, function(m0) { return m0 == '-' ? '+' : '/' }) |
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.replace(/[^A-Za-z0-9\+\/]/g, '') |
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); |
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}; |
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var noConflict = function() { |
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var Base64 = global.Base64; |
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global.Base64 = _Base64; |
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return Base64; |
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}; |
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// export Base64 |
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global.Base64 = { |
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VERSION: version, |
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atob: atob, |
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btoa: btoa, |
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fromBase64: decode, |
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toBase64: encode, |
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utob: utob, |
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encode: encode, |
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encodeURI: encodeURI, |
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btou: btou, |
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decode: decode, |
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noConflict: noConflict, |
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__buffer__: buffer |
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}; |
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// if ES5 is available, make Base64.extendString() available |
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if (typeof Object.defineProperty === 'function') { |
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var noEnum = function(v){ |
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return {value:v,enumerable:false,writable:true,configurable:true}; |
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}; |
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global.Base64.extendString = function () { |
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Object.defineProperty( |
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String.prototype, 'fromBase64', noEnum(function () { |
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return decode(this) |
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})); |
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Object.defineProperty( |
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String.prototype, 'toBase64', noEnum(function (urisafe) { |
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return encode(this, urisafe) |
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})); |
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Object.defineProperty( |
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String.prototype, 'toBase64URI', noEnum(function () { |
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return encode(this, true) |
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})); |
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}; |
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} |
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// |
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// export Base64 to the namespace |
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// |
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if (global['Meteor']) { // Meteor.js |
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Base64 = global.Base64; |
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} |
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// module.exports and AMD are mutually exclusive. |
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// module.exports has precedence. |
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if (typeof module !== 'undefined' && module.exports) { |
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module.exports.Base64 = global.Base64; |
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} |
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else if (typeof define === 'function' && define.amd) { |
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// AMD. Register as an anonymous module. |
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define([], function(){ return global.Base64 }); |
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} |
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// that's it! |
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return {Base64: global.Base64} |
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}));
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