mirror of https://github.com/jkjoy/sunpeiwen.git
231 lines
8.4 KiB
JavaScript
231 lines
8.4 KiB
JavaScript
/*
|
|
* base64.js
|
|
*
|
|
* Licensed under the BSD 3-Clause License.
|
|
* http://opensource.org/licenses/BSD-3-Clause
|
|
*
|
|
* References:
|
|
* http://en.wikipedia.org/wiki/Base64
|
|
*/
|
|
;(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';
|
|
// existing version for noConflict()
|
|
global = global || {};
|
|
var _Base64 = global.Base64;
|
|
var version = "2.6.4";
|
|
// constants
|
|
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;
|
|
// 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 && typeof global.btoa == 'function'
|
|
? function(b){ return global.btoa(b) } : function(b) {
|
|
if (b.match(/[^\x00-\xFF]/)) throw new RangeError(
|
|
'The string contains invalid characters.'
|
|
);
|
|
return b.replace(/[\s\S]{1,3}/g, cb_encode);
|
|
};
|
|
var _encode = function(u) {
|
|
return btoa(utob(String(u)));
|
|
};
|
|
var mkUriSafe = function (b64) {
|
|
return b64.replace(/[+\/]/g, function(m0) {
|
|
return m0 == '+' ? '-' : '_';
|
|
}).replace(/=/g, '');
|
|
};
|
|
var encode = function(u, urisafe) {
|
|
return urisafe ? mkUriSafe(_encode(u)) : _encode(u);
|
|
};
|
|
var encodeURI = function(u) { return encode(u, true) };
|
|
var fromUint8Array;
|
|
if (global.Uint8Array) fromUint8Array = function(a, urisafe) {
|
|
// return btoa(fromCharCode.apply(null, a));
|
|
var b64 = '';
|
|
for (var i = 0, l = a.length; i < l; i += 3) {
|
|
var a0 = a[i], a1 = a[i+1], a2 = a[i+2];
|
|
var ord = a0 << 16 | a1 << 8 | a2;
|
|
b64 += b64chars.charAt( ord >>> 18)
|
|
+ b64chars.charAt((ord >>> 12) & 63)
|
|
+ ( typeof a1 != 'undefined'
|
|
? b64chars.charAt((ord >>> 6) & 63) : '=')
|
|
+ ( typeof a2 != 'undefined'
|
|
? b64chars.charAt( ord & 63) : '=');
|
|
}
|
|
return urisafe ? mkUriSafe(b64) : b64;
|
|
};
|
|
// decoder stuff
|
|
var re_btou = /[\xC0-\xDF][\x80-\xBF]|[\xE0-\xEF][\x80-\xBF]{2}|[\xF0-\xF7][\x80-\xBF]{3}/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 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 && typeof global.atob == 'function'
|
|
? 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 = function(a) { return btou(_atob(a)) };
|
|
var _fromURI = function(a) {
|
|
return String(a).replace(/[-_]/g, function(m0) {
|
|
return m0 == '-' ? '+' : '/'
|
|
}).replace(/[^A-Za-z0-9\+\/]/g, '');
|
|
};
|
|
var decode = function(a){
|
|
return _decode(_fromURI(a));
|
|
};
|
|
var toUint8Array;
|
|
if (global.Uint8Array) toUint8Array = function(a) {
|
|
return Uint8Array.from(atob(_fromURI(a)), function(c) {
|
|
return c.charCodeAt(0);
|
|
});
|
|
};
|
|
var noConflict = function() {
|
|
var Base64 = global.Base64;
|
|
global.Base64 = _Base64;
|
|
return Base64;
|
|
};
|
|
// export 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,
|
|
fromUint8Array: fromUint8Array,
|
|
toUint8Array: toUint8Array
|
|
};
|
|
// 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)
|
|
}));
|
|
};
|
|
}
|
|
//
|
|
// export Base64 to the namespace
|
|
//
|
|
if (global['Meteor']) { // Meteor.js
|
|
Base64 = global.Base64;
|
|
}
|
|
// module.exports and AMD are mutually exclusive.
|
|
// module.exports has precedence.
|
|
if (typeof module !== 'undefined' && module.exports) {
|
|
module.exports.Base64 = global.Base64;
|
|
}
|
|
else if (typeof define === 'function' && define.amd) {
|
|
// AMD. Register as an anonymous module.
|
|
define([], function(){ return global.Base64 });
|
|
}
|
|
// that's it!
|
|
return {Base64: global.Base64}
|
|
}));
|