-
Notifications
You must be signed in to change notification settings - Fork 0
/
base64.js
20 lines (20 loc) · 5.58 KB
/
base64.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
(function(global, factory) { typeof exports === "object" && typeof module !== "undefined" ? module.exports = factory(global) : typeof define === "function" && define.amd ? define(factory) : factory(global) })(typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : typeof global !== "undefined" ? global : this, function(global) { "use strict";
global = global || {}; var _Base64 = global.Base64; var version = "2.5.1"; var buffer; if (typeof module !== "undefined" && module.exports) { try { buffer = eval("require('buffer').Buffer") } catch (err) { buffer = undefined } } var b64chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; 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; var cb_utob = function(c) { if (c.length < 2) { var cc = c.charCodeAt(0); return cc < 128 ? c : cc < 2048 ? fromCharCode(192 | cc >>> 6) + fromCharCode(128 | cc & 63) : fromCharCode(224 | cc >>> 12 & 15) + fromCharCode(128 | cc >>> 6 & 63) + fromCharCode(128 | cc & 63) } else { var cc = 65536 + (c.charCodeAt(0) - 55296) * 1024 + (c.charCodeAt(1) - 56320); return fromCharCode(240 | cc >>> 18 & 7) + fromCharCode(128 | cc >>> 12 & 63) + fromCharCode(128 | cc >>> 6 & 63) + fromCharCode(128 | cc & 63) } }; 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 global.btoa(b) } : function(b) { return b.replace(/[\s\S]{1,3}/g, cb_encode) }; var _encode = buffer ? buffer.from && Uint8Array && buffer.from !== Uint8Array.from ? function(u) { return (u.constructor === buffer.constructor ? u : buffer.from(u)).toString("base64") } : function(u) { return (u.constructor === buffer.constructor ? u : new buffer(u)).toString("base64") } : function(u) { return btoa(utob(u)) }; var encode = function(u, urisafe) { return !urisafe ? _encode(String(u)) : _encode(String(u)).replace(/[+\/]/g, function(m0) { return m0 == "+" ? "-" : "_" }).replace(/=/g, "") }; var encodeURI = function(u) { return encode(u, true) }; var re_btou = new RegExp(["[À-ß][-¿]", "[à-ï][-¿]{2}", "[ð-÷][-¿]{3}"].join("|"), "g"); var cb_btou = function(cccc) { switch (cccc.length) {
case 4:
var cp = (7 & cccc.charCodeAt(0)) << 18 | (63 & cccc.charCodeAt(1)) << 12 | (63 & cccc.charCodeAt(2)) << 6 | 63 & cccc.charCodeAt(3),
offset = cp - 65536; return fromCharCode((offset >>> 10) + 55296) + fromCharCode((offset & 1023) + 56320);
case 3:
return fromCharCode((15 & cccc.charCodeAt(0)) << 12 | (63 & cccc.charCodeAt(1)) << 6 | 63 & cccc.charCodeAt(2));
default:
return fromCharCode((31 & cccc.charCodeAt(0)) << 6 | 63 & cccc.charCodeAt(1)) } }; 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 & 255), fromCharCode(n & 255)];
chars.length -= [0, 0, 2, 1][padlen]; return chars.join("") }; var _atob = global.atob ? function(a) { return global.atob(a) } : function(a) { return a.replace(/\S{1,4}/g, cb_decode) }; var atob = function(a) { return _atob(String(a).replace(/[^A-Za-z0-9\+\/]/g, "")) }; var _decode = buffer ? buffer.from && Uint8Array && buffer.from !== Uint8Array.from ? function(a) { return (a.constructor === buffer.constructor ? a : buffer.from(a, "base64")).toString() } : function(a) { return (a.constructor === buffer.constructor ? a : new buffer(a, "base64")).toString() } : function(a) { return btou(_atob(a)) }; var decode = function(a) { return _decode(String(a).replace(/[-_]/g, function(m0) { return m0 == "-" ? "+" : "/" }).replace(/[^A-Za-z0-9\+\/]/g, "")) }; var noConflict = function() { var Base64 = global.Base64;
global.Base64 = _Base64; return Base64 };
global.Base64 = { VERSION: version, atob: atob, btoa: btoa, fromBase64: decode, toBase64: encode, utob: utob, encode: encode, encodeURI: encodeURI, btou: btou, decode: decode, noConflict: noConflict, __buffer__: buffer }; 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) })) } } if (global["Meteor"]) { Base64 = global.Base64 } if (typeof module !== "undefined" && module.exports) { module.exports.Base64 = global.Base64 } else if (typeof define === "function" && define.amd) { define([], function() { return global.Base64 }) } return { Base64: global.Base64 } });