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Copyright (c) 2014, Dan Kogai
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of {{{project}}} nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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[![CI via GitHub Actions](https://github.com/dankogai/js-base64/actions/workflows/node.js.yml/badge.svg)](https://github.com/dankogai/js-base64/actions/workflows/node.js.yml)
# base64.js
Yet another [Base64] transcoder.
[Base64]: http://en.wikipedia.org/wiki/Base64
## Install
```shell
$ npm install --save js-base64
```
## Usage
### In Browser
Locally…
```html
<script src="base64.js"></script>
```
… or Directly from CDN. In which case you don't even need to install.
```html
<script src="https://cdn.jsdelivr.net/npm/js-base64@3.7.7/base64.min.js"></script>
```
This good old way loads `Base64` in the global context (`window`). Though `Base64.noConflict()` is made available, you should consider using ES6 Module to avoid tainting `window`.
### As an ES6 Module
locally…
```javascript
import { Base64 } from 'js-base64';
```
```javascript
// or if you prefer no Base64 namespace
import { encode, decode } from 'js-base64';
```
or even remotely.
```html
<script type="module">
// note jsdelivr.net does not automatically minify .mjs
import { Base64 } from 'https://cdn.jsdelivr.net/npm/js-base64@3.7.7/base64.mjs';
</script>
```
```html
<script type="module">
// or if you prefer no Base64 namespace
import { encode, decode } from 'https://cdn.jsdelivr.net/npm/js-base64@3.7.7/base64.mjs';
</script>
```
### node.js (commonjs)
```javascript
const {Base64} = require('js-base64');
```
Unlike the case above, the global context is no longer modified.
You can also use [esm] to `import` instead of `require`.
[esm]: https://github.com/standard-things/esm
```javascript
require=require('esm')(module);
import {Base64} from 'js-base64';
```
## SYNOPSIS
```javascript
let latin = 'dankogai';
let utf8 = '小飼弾'
let u8s = new Uint8Array([100,97,110,107,111,103,97,105]);
Base64.encode(latin); // ZGFua29nYWk=
Base64.encode(latin, true); // ZGFua29nYWk skips padding
Base64.encodeURI(latin); // ZGFua29nYWk
Base64.btoa(latin); // ZGFua29nYWk=
Base64.btoa(utf8); // raises exception
Base64.fromUint8Array(u8s); // ZGFua29nYWk=
Base64.fromUint8Array(u8s, true); // ZGFua29nYW which is URI safe
Base64.encode(utf8); // 5bCP6aO85by+
Base64.encode(utf8, true) // 5bCP6aO85by-
Base64.encodeURI(utf8); // 5bCP6aO85by-
```
```javascript
Base64.decode( 'ZGFua29nYWk=');// dankogai
Base64.decode( 'ZGFua29nYWk'); // dankogai
Base64.atob( 'ZGFua29nYWk=');// dankogai
Base64.atob( '5bCP6aO85by+');// '小飼弾' which is nonsense
Base64.toUint8Array('ZGFua29nYWk=');// u8s above
Base64.decode( '5bCP6aO85by+');// 小飼弾
// note .decodeURI() is unnecessary since it accepts both flavors
Base64.decode( '5bCP6aO85by-');// 小飼弾
```
```javascript
Base64.isValid(0); // false: 0 is not string
Base64.isValid(''); // true: a valid Base64-encoded empty byte
Base64.isValid('ZA=='); // true: a valid Base64-encoded 'd'
Base64.isValid('Z A='); // true: whitespaces are okay
Base64.isValid('ZA'); // true: padding ='s can be omitted
Base64.isValid('++'); // true: can be non URL-safe
Base64.isValid('--'); // true: or URL-safe
Base64.isValid('+-'); // false: can't mix both
```
### Built-in Extensions
By default `Base64` leaves built-in prototypes untouched. But you can extend them as below.
```javascript
// you have to explicitly extend String.prototype
Base64.extendString();
// once extended, you can do the following
'dankogai'.toBase64(); // ZGFua29nYWk=
'小飼弾'.toBase64(); // 5bCP6aO85by+
'小飼弾'.toBase64(true); // 5bCP6aO85by-
'小飼弾'.toBase64URI(); // 5bCP6aO85by- ab alias of .toBase64(true)
'小飼弾'.toBase64URL(); // 5bCP6aO85by- an alias of .toBase64URI()
'ZGFua29nYWk='.fromBase64(); // dankogai
'5bCP6aO85by+'.fromBase64(); // 小飼弾
'5bCP6aO85by-'.fromBase64(); // 小飼弾
'5bCP6aO85by-'.toUint8Array();// u8s above
```
```javascript
// you have to explicitly extend Uint8Array.prototype
Base64.extendUint8Array();
// once extended, you can do the following
u8s.toBase64(); // 'ZGFua29nYWk='
u8s.toBase64URI(); // 'ZGFua29nYWk'
u8s.toBase64URL(); // 'ZGFua29nYWk' an alias of .toBase64URI()
```
```javascript
// extend all at once
Base64.extendBuiltins()
```
## `.decode()` vs `.atob` (and `.encode()` vs `btoa()`)
Suppose you have:
```
var pngBase64 =
"iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=";
```
Which is a Base64-encoded 1x1 transparent PNG, **DO NOT USE** `Base64.decode(pngBase64)`.  Use `Base64.atob(pngBase64)` instead.  `Base64.decode()` decodes to UTF-8 string while `Base64.atob()` decodes to bytes, which is compatible to browser built-in `atob()` (Which is absent in node.js).  The same rule applies to the opposite direction.
Or even better, `Base64.toUint8Array(pngBase64)`.
## Brief History
* Since version 3.3 it is written in TypeScript. Now `base64.mjs` is compiled from `base64.ts` then `base64.js` is generated from `base64.mjs`.
* Since version 3.7 `base64.js` is ES5-compatible again (hence IE11-compatible).
* Since 3.0 `js-base64` switch to ES2015 module so it is no longer compatible with legacy browsers like IE (see above)

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/**
* base64.ts
*
* Licensed under the BSD 3-Clause License.
* http://opensource.org/licenses/BSD-3-Clause
*
* References:
* http://en.wikipedia.org/wiki/Base64
*
* @author Dan Kogai (https://github.com/dankogai)
*/
declare const version = "3.7.7";
/**
* @deprecated use lowercase `version`.
*/
declare const VERSION = "3.7.7";
/**
* polyfill version of `btoa`
*/
declare const btoaPolyfill: (bin: string) => string;
/**
* does what `window.btoa` of web browsers do.
* @param {String} bin binary string
* @returns {string} Base64-encoded string
*/
declare const _btoa: (bin: string) => string;
/**
* converts a Uint8Array to a Base64 string.
* @param {boolean} [urlsafe] URL-and-filename-safe a la RFC4648 §5
* @returns {string} Base64 string
*/
declare const fromUint8Array: (u8a: Uint8Array, urlsafe?: boolean) => string;
/**
* @deprecated should have been internal use only.
* @param {string} src UTF-8 string
* @returns {string} UTF-16 string
*/
declare const utob: (u: string) => string;
/**
* converts a UTF-8-encoded string to a Base64 string.
* @param {boolean} [urlsafe] if `true` make the result URL-safe
* @returns {string} Base64 string
*/
declare const encode: (src: string, urlsafe?: boolean) => string;
/**
* converts a UTF-8-encoded string to URL-safe Base64 RFC4648 §5.
* @returns {string} Base64 string
*/
declare const encodeURI: (src: string) => string;
/**
* @deprecated should have been internal use only.
* @param {string} src UTF-16 string
* @returns {string} UTF-8 string
*/
declare const btou: (b: string) => string;
/**
* polyfill version of `atob`
*/
declare const atobPolyfill: (asc: string) => string;
/**
* does what `window.atob` of web browsers do.
* @param {String} asc Base64-encoded string
* @returns {string} binary string
*/
declare const _atob: (asc: string) => string;
/**
* converts a Base64 string to a Uint8Array.
*/
declare const toUint8Array: (a: string) => Uint8Array;
/**
* converts a Base64 string to a UTF-8 string.
* @param {String} src Base64 string. Both normal and URL-safe are supported
* @returns {string} UTF-8 string
*/
declare const decode: (src: string) => string;
/**
* check if a value is a valid Base64 string
* @param {String} src a value to check
*/
declare const isValid: (src: any) => boolean;
/**
* extend String.prototype with relevant methods
*/
declare const extendString: () => void;
/**
* extend Uint8Array.prototype with relevant methods
*/
declare const extendUint8Array: () => void;
/**
* extend Builtin prototypes with relevant methods
*/
declare const extendBuiltins: () => void;
declare const gBase64: {
version: string;
VERSION: string;
atob: (asc: string) => string;
atobPolyfill: (asc: string) => string;
btoa: (bin: string) => string;
btoaPolyfill: (bin: string) => string;
fromBase64: (src: string) => string;
toBase64: (src: string, urlsafe?: boolean) => string;
encode: (src: string, urlsafe?: boolean) => string;
encodeURI: (src: string) => string;
encodeURL: (src: string) => string;
utob: (u: string) => string;
btou: (b: string) => string;
decode: (src: string) => string;
isValid: (src: any) => boolean;
fromUint8Array: (u8a: Uint8Array, urlsafe?: boolean) => string;
toUint8Array: (a: string) => Uint8Array;
extendString: () => void;
extendUint8Array: () => void;
extendBuiltins: () => void;
};
export { version };
export { VERSION };
export { _atob as atob };
export { atobPolyfill };
export { _btoa as btoa };
export { btoaPolyfill };
export { decode as fromBase64 };
export { encode as toBase64 };
export { utob };
export { encode };
export { encodeURI };
export { encodeURI as encodeURL };
export { btou };
export { decode };
export { isValid };
export { fromUint8Array };
export { toUint8Array };
export { extendString };
export { extendUint8Array };
export { extendBuiltins };
export { gBase64 as Base64 };

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/**
* base64.ts
*
* Licensed under the BSD 3-Clause License.
* http://opensource.org/licenses/BSD-3-Clause
*
* References:
* http://en.wikipedia.org/wiki/Base64
*
* @author Dan Kogai (https://github.com/dankogai)
*/
declare const version = "3.7.7";
/**
* @deprecated use lowercase `version`.
*/
declare const VERSION = "3.7.7";
/**
* polyfill version of `btoa`
*/
declare const btoaPolyfill: (bin: string) => string;
/**
* does what `window.btoa` of web browsers do.
* @param {String} bin binary string
* @returns {string} Base64-encoded string
*/
declare const _btoa: (bin: string) => string;
/**
* converts a Uint8Array to a Base64 string.
* @param {boolean} [urlsafe] URL-and-filename-safe a la RFC4648 §5
* @returns {string} Base64 string
*/
declare const fromUint8Array: (u8a: Uint8Array, urlsafe?: boolean) => string;
/**
* @deprecated should have been internal use only.
* @param {string} src UTF-8 string
* @returns {string} UTF-16 string
*/
declare const utob: (u: string) => string;
/**
* converts a UTF-8-encoded string to a Base64 string.
* @param {boolean} [urlsafe] if `true` make the result URL-safe
* @returns {string} Base64 string
*/
declare const encode: (src: string, urlsafe?: boolean) => string;
/**
* converts a UTF-8-encoded string to URL-safe Base64 RFC4648 §5.
* @returns {string} Base64 string
*/
declare const encodeURI: (src: string) => string;
/**
* @deprecated should have been internal use only.
* @param {string} src UTF-16 string
* @returns {string} UTF-8 string
*/
declare const btou: (b: string) => string;
/**
* polyfill version of `atob`
*/
declare const atobPolyfill: (asc: string) => string;
/**
* does what `window.atob` of web browsers do.
* @param {String} asc Base64-encoded string
* @returns {string} binary string
*/
declare const _atob: (asc: string) => string;
/**
* converts a Base64 string to a Uint8Array.
*/
declare const toUint8Array: (a: string) => Uint8Array;
/**
* converts a Base64 string to a UTF-8 string.
* @param {String} src Base64 string. Both normal and URL-safe are supported
* @returns {string} UTF-8 string
*/
declare const decode: (src: string) => string;
/**
* check if a value is a valid Base64 string
* @param {String} src a value to check
*/
declare const isValid: (src: any) => boolean;
/**
* extend String.prototype with relevant methods
*/
declare const extendString: () => void;
/**
* extend Uint8Array.prototype with relevant methods
*/
declare const extendUint8Array: () => void;
/**
* extend Builtin prototypes with relevant methods
*/
declare const extendBuiltins: () => void;
declare const gBase64: {
version: string;
VERSION: string;
atob: (asc: string) => string;
atobPolyfill: (asc: string) => string;
btoa: (bin: string) => string;
btoaPolyfill: (bin: string) => string;
fromBase64: (src: string) => string;
toBase64: (src: string, urlsafe?: boolean) => string;
encode: (src: string, urlsafe?: boolean) => string;
encodeURI: (src: string) => string;
encodeURL: (src: string) => string;
utob: (u: string) => string;
btou: (b: string) => string;
decode: (src: string) => string;
isValid: (src: any) => boolean;
fromUint8Array: (u8a: Uint8Array, urlsafe?: boolean) => string;
toUint8Array: (a: string) => Uint8Array;
extendString: () => void;
extendUint8Array: () => void;
extendBuiltins: () => void;
};
export { version };
export { VERSION };
export { _atob as atob };
export { atobPolyfill };
export { _btoa as btoa };
export { btoaPolyfill };
export { decode as fromBase64 };
export { encode as toBase64 };
export { utob };
export { encode };
export { encodeURI };
export { encodeURI as encodeURL };
export { btou };
export { decode };
export { isValid };
export { fromUint8Array };
export { toUint8Array };
export { extendString };
export { extendUint8Array };
export { extendBuiltins };
export { gBase64 as Base64 };

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//
// THIS FILE IS AUTOMATICALLY GENERATED! DO NOT EDIT BY HAND!
//
;
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined'
? module.exports = factory()
: typeof define === 'function' && define.amd
? define(factory) :
// cf. https://github.com/dankogai/js-base64/issues/119
(function () {
// existing version for noConflict()
var _Base64 = global.Base64;
var gBase64 = factory();
gBase64.noConflict = function () {
global.Base64 = _Base64;
return gBase64;
};
if (global.Meteor) { // Meteor.js
Base64 = gBase64;
}
global.Base64 = gBase64;
})();
}((typeof self !== 'undefined' ? self
: typeof window !== 'undefined' ? window
: typeof global !== 'undefined' ? global
: this), function () {
'use strict';
/**
* base64.ts
*
* Licensed under the BSD 3-Clause License.
* http://opensource.org/licenses/BSD-3-Clause
*
* References:
* http://en.wikipedia.org/wiki/Base64
*
* @author Dan Kogai (https://github.com/dankogai)
*/
var version = '3.7.7';
/**
* @deprecated use lowercase `version`.
*/
var VERSION = version;
var _hasBuffer = typeof Buffer === 'function';
var _TD = typeof TextDecoder === 'function' ? new TextDecoder() : undefined;
var _TE = typeof TextEncoder === 'function' ? new TextEncoder() : undefined;
var b64ch = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
var b64chs = Array.prototype.slice.call(b64ch);
var b64tab = (function (a) {
var tab = {};
a.forEach(function (c, i) { return tab[c] = i; });
return tab;
})(b64chs);
var b64re = /^(?:[A-Za-z\d+\/]{4})*?(?:[A-Za-z\d+\/]{2}(?:==)?|[A-Za-z\d+\/]{3}=?)?$/;
var _fromCC = String.fromCharCode.bind(String);
var _U8Afrom = typeof Uint8Array.from === 'function'
? Uint8Array.from.bind(Uint8Array)
: function (it) { return new Uint8Array(Array.prototype.slice.call(it, 0)); };
var _mkUriSafe = function (src) { return src
.replace(/=/g, '').replace(/[+\/]/g, function (m0) { return m0 == '+' ? '-' : '_'; }); };
var _tidyB64 = function (s) { return s.replace(/[^A-Za-z0-9\+\/]/g, ''); };
/**
* polyfill version of `btoa`
*/
var btoaPolyfill = function (bin) {
// console.log('polyfilled');
var u32, c0, c1, c2, asc = '';
var pad = bin.length % 3;
for (var i = 0; i < bin.length;) {
if ((c0 = bin.charCodeAt(i++)) > 255 ||
(c1 = bin.charCodeAt(i++)) > 255 ||
(c2 = bin.charCodeAt(i++)) > 255)
throw new TypeError('invalid character found');
u32 = (c0 << 16) | (c1 << 8) | c2;
asc += b64chs[u32 >> 18 & 63]
+ b64chs[u32 >> 12 & 63]
+ b64chs[u32 >> 6 & 63]
+ b64chs[u32 & 63];
}
return pad ? asc.slice(0, pad - 3) + "===".substring(pad) : asc;
};
/**
* does what `window.btoa` of web browsers do.
* @param {String} bin binary string
* @returns {string} Base64-encoded string
*/
var _btoa = typeof btoa === 'function' ? function (bin) { return btoa(bin); }
: _hasBuffer ? function (bin) { return Buffer.from(bin, 'binary').toString('base64'); }
: btoaPolyfill;
var _fromUint8Array = _hasBuffer
? function (u8a) { return Buffer.from(u8a).toString('base64'); }
: function (u8a) {
// cf. https://stackoverflow.com/questions/12710001/how-to-convert-uint8-array-to-base64-encoded-string/12713326#12713326
var maxargs = 0x1000;
var strs = [];
for (var i = 0, l = u8a.length; i < l; i += maxargs) {
strs.push(_fromCC.apply(null, u8a.subarray(i, i + maxargs)));
}
return _btoa(strs.join(''));
};
/**
* converts a Uint8Array to a Base64 string.
* @param {boolean} [urlsafe] URL-and-filename-safe a la RFC4648 §5
* @returns {string} Base64 string
*/
var fromUint8Array = function (u8a, urlsafe) {
if (urlsafe === void 0) { urlsafe = false; }
return urlsafe ? _mkUriSafe(_fromUint8Array(u8a)) : _fromUint8Array(u8a);
};
// This trick is found broken https://github.com/dankogai/js-base64/issues/130
// const utob = (src: string) => unescape(encodeURIComponent(src));
// reverting good old fationed regexp
var cb_utob = function (c) {
if (c.length < 2) {
var cc = c.charCodeAt(0);
return cc < 0x80 ? c
: cc < 0x800 ? (_fromCC(0xc0 | (cc >>> 6))
+ _fromCC(0x80 | (cc & 0x3f)))
: (_fromCC(0xe0 | ((cc >>> 12) & 0x0f))
+ _fromCC(0x80 | ((cc >>> 6) & 0x3f))
+ _fromCC(0x80 | (cc & 0x3f)));
}
else {
var cc = 0x10000
+ (c.charCodeAt(0) - 0xD800) * 0x400
+ (c.charCodeAt(1) - 0xDC00);
return (_fromCC(0xf0 | ((cc >>> 18) & 0x07))
+ _fromCC(0x80 | ((cc >>> 12) & 0x3f))
+ _fromCC(0x80 | ((cc >>> 6) & 0x3f))
+ _fromCC(0x80 | (cc & 0x3f)));
}
};
var re_utob = /[\uD800-\uDBFF][\uDC00-\uDFFFF]|[^\x00-\x7F]/g;
/**
* @deprecated should have been internal use only.
* @param {string} src UTF-8 string
* @returns {string} UTF-16 string
*/
var utob = function (u) { return u.replace(re_utob, cb_utob); };
//
var _encode = _hasBuffer
? function (s) { return Buffer.from(s, 'utf8').toString('base64'); }
: _TE
? function (s) { return _fromUint8Array(_TE.encode(s)); }
: function (s) { return _btoa(utob(s)); };
/**
* converts a UTF-8-encoded string to a Base64 string.
* @param {boolean} [urlsafe] if `true` make the result URL-safe
* @returns {string} Base64 string
*/
var encode = function (src, urlsafe) {
if (urlsafe === void 0) { urlsafe = false; }
return urlsafe
? _mkUriSafe(_encode(src))
: _encode(src);
};
/**
* converts a UTF-8-encoded string to URL-safe Base64 RFC4648 §5.
* @returns {string} Base64 string
*/
var encodeURI = function (src) { return encode(src, true); };
// This trick is found broken https://github.com/dankogai/js-base64/issues/130
// const btou = (src: string) => decodeURIComponent(escape(src));
// reverting good old fationed regexp
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 (_fromCC((offset >>> 10) + 0xD800)
+ _fromCC((offset & 0x3FF) + 0xDC00));
case 3:
return _fromCC(((0x0f & cccc.charCodeAt(0)) << 12)
| ((0x3f & cccc.charCodeAt(1)) << 6)
| (0x3f & cccc.charCodeAt(2)));
default:
return _fromCC(((0x1f & cccc.charCodeAt(0)) << 6)
| (0x3f & cccc.charCodeAt(1)));
}
};
/**
* @deprecated should have been internal use only.
* @param {string} src UTF-16 string
* @returns {string} UTF-8 string
*/
var btou = function (b) { return b.replace(re_btou, cb_btou); };
/**
* polyfill version of `atob`
*/
var atobPolyfill = function (asc) {
// console.log('polyfilled');
asc = asc.replace(/\s+/g, '');
if (!b64re.test(asc))
throw new TypeError('malformed base64.');
asc += '=='.slice(2 - (asc.length & 3));
var u24, bin = '', r1, r2;
for (var i = 0; i < asc.length;) {
u24 = b64tab[asc.charAt(i++)] << 18
| b64tab[asc.charAt(i++)] << 12
| (r1 = b64tab[asc.charAt(i++)]) << 6
| (r2 = b64tab[asc.charAt(i++)]);
bin += r1 === 64 ? _fromCC(u24 >> 16 & 255)
: r2 === 64 ? _fromCC(u24 >> 16 & 255, u24 >> 8 & 255)
: _fromCC(u24 >> 16 & 255, u24 >> 8 & 255, u24 & 255);
}
return bin;
};
/**
* does what `window.atob` of web browsers do.
* @param {String} asc Base64-encoded string
* @returns {string} binary string
*/
var _atob = typeof atob === 'function' ? function (asc) { return atob(_tidyB64(asc)); }
: _hasBuffer ? function (asc) { return Buffer.from(asc, 'base64').toString('binary'); }
: atobPolyfill;
//
var _toUint8Array = _hasBuffer
? function (a) { return _U8Afrom(Buffer.from(a, 'base64')); }
: function (a) { return _U8Afrom(_atob(a).split('').map(function (c) { return c.charCodeAt(0); })); };
/**
* converts a Base64 string to a Uint8Array.
*/
var toUint8Array = function (a) { return _toUint8Array(_unURI(a)); };
//
var _decode = _hasBuffer
? function (a) { return Buffer.from(a, 'base64').toString('utf8'); }
: _TD
? function (a) { return _TD.decode(_toUint8Array(a)); }
: function (a) { return btou(_atob(a)); };
var _unURI = function (a) { return _tidyB64(a.replace(/[-_]/g, function (m0) { return m0 == '-' ? '+' : '/'; })); };
/**
* converts a Base64 string to a UTF-8 string.
* @param {String} src Base64 string. Both normal and URL-safe are supported
* @returns {string} UTF-8 string
*/
var decode = function (src) { return _decode(_unURI(src)); };
/**
* check if a value is a valid Base64 string
* @param {String} src a value to check
*/
var isValid = function (src) {
if (typeof src !== 'string')
return false;
var s = src.replace(/\s+/g, '').replace(/={0,2}$/, '');
return !/[^\s0-9a-zA-Z\+/]/.test(s) || !/[^\s0-9a-zA-Z\-_]/.test(s);
};
//
var _noEnum = function (v) {
return {
value: v, enumerable: false, writable: true, configurable: true
};
};
/**
* extend String.prototype with relevant methods
*/
var extendString = function () {
var _add = function (name, body) { return Object.defineProperty(String.prototype, name, _noEnum(body)); };
_add('fromBase64', function () { return decode(this); });
_add('toBase64', function (urlsafe) { return encode(this, urlsafe); });
_add('toBase64URI', function () { return encode(this, true); });
_add('toBase64URL', function () { return encode(this, true); });
_add('toUint8Array', function () { return toUint8Array(this); });
};
/**
* extend Uint8Array.prototype with relevant methods
*/
var extendUint8Array = function () {
var _add = function (name, body) { return Object.defineProperty(Uint8Array.prototype, name, _noEnum(body)); };
_add('toBase64', function (urlsafe) { return fromUint8Array(this, urlsafe); });
_add('toBase64URI', function () { return fromUint8Array(this, true); });
_add('toBase64URL', function () { return fromUint8Array(this, true); });
};
/**
* extend Builtin prototypes with relevant methods
*/
var extendBuiltins = function () {
extendString();
extendUint8Array();
};
var gBase64 = {
version: version,
VERSION: VERSION,
atob: _atob,
atobPolyfill: atobPolyfill,
btoa: _btoa,
btoaPolyfill: btoaPolyfill,
fromBase64: decode,
toBase64: encode,
encode: encode,
encodeURI: encodeURI,
encodeURL: encodeURI,
utob: utob,
btou: btou,
decode: decode,
isValid: isValid,
fromUint8Array: fromUint8Array,
toUint8Array: toUint8Array,
extendString: extendString,
extendUint8Array: extendUint8Array,
extendBuiltins: extendBuiltins
};
//
// export Base64 to the namespace
//
// ES5 is yet to have Object.assign() that may make transpilers unhappy.
// gBase64.Base64 = Object.assign({}, gBase64);
gBase64.Base64 = {};
Object.keys(gBase64).forEach(function (k) { return gBase64.Base64[k] = gBase64[k]; });
return gBase64;
}));

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/**
* base64.ts
*
* Licensed under the BSD 3-Clause License.
* http://opensource.org/licenses/BSD-3-Clause
*
* References:
* http://en.wikipedia.org/wiki/Base64
*
* @author Dan Kogai (https://github.com/dankogai)
*/
const version = '3.7.7';
/**
* @deprecated use lowercase `version`.
*/
const VERSION = version;
const _hasBuffer = typeof Buffer === 'function';
const _TD = typeof TextDecoder === 'function' ? new TextDecoder() : undefined;
const _TE = typeof TextEncoder === 'function' ? new TextEncoder() : undefined;
const b64ch = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
const b64chs = Array.prototype.slice.call(b64ch);
const b64tab = ((a) => {
let tab = {};
a.forEach((c, i) => tab[c] = i);
return tab;
})(b64chs);
const b64re = /^(?:[A-Za-z\d+\/]{4})*?(?:[A-Za-z\d+\/]{2}(?:==)?|[A-Za-z\d+\/]{3}=?)?$/;
const _fromCC = String.fromCharCode.bind(String);
const _U8Afrom = typeof Uint8Array.from === 'function'
? Uint8Array.from.bind(Uint8Array)
: (it) => new Uint8Array(Array.prototype.slice.call(it, 0));
const _mkUriSafe = (src) => src
.replace(/=/g, '').replace(/[+\/]/g, (m0) => m0 == '+' ? '-' : '_');
const _tidyB64 = (s) => s.replace(/[^A-Za-z0-9\+\/]/g, '');
/**
* polyfill version of `btoa`
*/
const btoaPolyfill = (bin) => {
// console.log('polyfilled');
let u32, c0, c1, c2, asc = '';
const pad = bin.length % 3;
for (let i = 0; i < bin.length;) {
if ((c0 = bin.charCodeAt(i++)) > 255 ||
(c1 = bin.charCodeAt(i++)) > 255 ||
(c2 = bin.charCodeAt(i++)) > 255)
throw new TypeError('invalid character found');
u32 = (c0 << 16) | (c1 << 8) | c2;
asc += b64chs[u32 >> 18 & 63]
+ b64chs[u32 >> 12 & 63]
+ b64chs[u32 >> 6 & 63]
+ b64chs[u32 & 63];
}
return pad ? asc.slice(0, pad - 3) + "===".substring(pad) : asc;
};
/**
* does what `window.btoa` of web browsers do.
* @param {String} bin binary string
* @returns {string} Base64-encoded string
*/
const _btoa = typeof btoa === 'function' ? (bin) => btoa(bin)
: _hasBuffer ? (bin) => Buffer.from(bin, 'binary').toString('base64')
: btoaPolyfill;
const _fromUint8Array = _hasBuffer
? (u8a) => Buffer.from(u8a).toString('base64')
: (u8a) => {
// cf. https://stackoverflow.com/questions/12710001/how-to-convert-uint8-array-to-base64-encoded-string/12713326#12713326
const maxargs = 0x1000;
let strs = [];
for (let i = 0, l = u8a.length; i < l; i += maxargs) {
strs.push(_fromCC.apply(null, u8a.subarray(i, i + maxargs)));
}
return _btoa(strs.join(''));
};
/**
* converts a Uint8Array to a Base64 string.
* @param {boolean} [urlsafe] URL-and-filename-safe a la RFC4648 §5
* @returns {string} Base64 string
*/
const fromUint8Array = (u8a, urlsafe = false) => urlsafe ? _mkUriSafe(_fromUint8Array(u8a)) : _fromUint8Array(u8a);
// This trick is found broken https://github.com/dankogai/js-base64/issues/130
// const utob = (src: string) => unescape(encodeURIComponent(src));
// reverting good old fationed regexp
const cb_utob = (c) => {
if (c.length < 2) {
var cc = c.charCodeAt(0);
return cc < 0x80 ? c
: cc < 0x800 ? (_fromCC(0xc0 | (cc >>> 6))
+ _fromCC(0x80 | (cc & 0x3f)))
: (_fromCC(0xe0 | ((cc >>> 12) & 0x0f))
+ _fromCC(0x80 | ((cc >>> 6) & 0x3f))
+ _fromCC(0x80 | (cc & 0x3f)));
}
else {
var cc = 0x10000
+ (c.charCodeAt(0) - 0xD800) * 0x400
+ (c.charCodeAt(1) - 0xDC00);
return (_fromCC(0xf0 | ((cc >>> 18) & 0x07))
+ _fromCC(0x80 | ((cc >>> 12) & 0x3f))
+ _fromCC(0x80 | ((cc >>> 6) & 0x3f))
+ _fromCC(0x80 | (cc & 0x3f)));
}
};
const re_utob = /[\uD800-\uDBFF][\uDC00-\uDFFFF]|[^\x00-\x7F]/g;
/**
* @deprecated should have been internal use only.
* @param {string} src UTF-8 string
* @returns {string} UTF-16 string
*/
const utob = (u) => u.replace(re_utob, cb_utob);
//
const _encode = _hasBuffer
? (s) => Buffer.from(s, 'utf8').toString('base64')
: _TE
? (s) => _fromUint8Array(_TE.encode(s))
: (s) => _btoa(utob(s));
/**
* converts a UTF-8-encoded string to a Base64 string.
* @param {boolean} [urlsafe] if `true` make the result URL-safe
* @returns {string} Base64 string
*/
const encode = (src, urlsafe = false) => urlsafe
? _mkUriSafe(_encode(src))
: _encode(src);
/**
* converts a UTF-8-encoded string to URL-safe Base64 RFC4648 §5.
* @returns {string} Base64 string
*/
const encodeURI = (src) => encode(src, true);
// This trick is found broken https://github.com/dankogai/js-base64/issues/130
// const btou = (src: string) => decodeURIComponent(escape(src));
// reverting good old fationed regexp
const re_btou = /[\xC0-\xDF][\x80-\xBF]|[\xE0-\xEF][\x80-\xBF]{2}|[\xF0-\xF7][\x80-\xBF]{3}/g;
const cb_btou = (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 (_fromCC((offset >>> 10) + 0xD800)
+ _fromCC((offset & 0x3FF) + 0xDC00));
case 3:
return _fromCC(((0x0f & cccc.charCodeAt(0)) << 12)
| ((0x3f & cccc.charCodeAt(1)) << 6)
| (0x3f & cccc.charCodeAt(2)));
default:
return _fromCC(((0x1f & cccc.charCodeAt(0)) << 6)
| (0x3f & cccc.charCodeAt(1)));
}
};
/**
* @deprecated should have been internal use only.
* @param {string} src UTF-16 string
* @returns {string} UTF-8 string
*/
const btou = (b) => b.replace(re_btou, cb_btou);
/**
* polyfill version of `atob`
*/
const atobPolyfill = (asc) => {
// console.log('polyfilled');
asc = asc.replace(/\s+/g, '');
if (!b64re.test(asc))
throw new TypeError('malformed base64.');
asc += '=='.slice(2 - (asc.length & 3));
let u24, bin = '', r1, r2;
for (let i = 0; i < asc.length;) {
u24 = b64tab[asc.charAt(i++)] << 18
| b64tab[asc.charAt(i++)] << 12
| (r1 = b64tab[asc.charAt(i++)]) << 6
| (r2 = b64tab[asc.charAt(i++)]);
bin += r1 === 64 ? _fromCC(u24 >> 16 & 255)
: r2 === 64 ? _fromCC(u24 >> 16 & 255, u24 >> 8 & 255)
: _fromCC(u24 >> 16 & 255, u24 >> 8 & 255, u24 & 255);
}
return bin;
};
/**
* does what `window.atob` of web browsers do.
* @param {String} asc Base64-encoded string
* @returns {string} binary string
*/
const _atob = typeof atob === 'function' ? (asc) => atob(_tidyB64(asc))
: _hasBuffer ? (asc) => Buffer.from(asc, 'base64').toString('binary')
: atobPolyfill;
//
const _toUint8Array = _hasBuffer
? (a) => _U8Afrom(Buffer.from(a, 'base64'))
: (a) => _U8Afrom(_atob(a).split('').map(c => c.charCodeAt(0)));
/**
* converts a Base64 string to a Uint8Array.
*/
const toUint8Array = (a) => _toUint8Array(_unURI(a));
//
const _decode = _hasBuffer
? (a) => Buffer.from(a, 'base64').toString('utf8')
: _TD
? (a) => _TD.decode(_toUint8Array(a))
: (a) => btou(_atob(a));
const _unURI = (a) => _tidyB64(a.replace(/[-_]/g, (m0) => m0 == '-' ? '+' : '/'));
/**
* converts a Base64 string to a UTF-8 string.
* @param {String} src Base64 string. Both normal and URL-safe are supported
* @returns {string} UTF-8 string
*/
const decode = (src) => _decode(_unURI(src));
/**
* check if a value is a valid Base64 string
* @param {String} src a value to check
*/
const isValid = (src) => {
if (typeof src !== 'string')
return false;
const s = src.replace(/\s+/g, '').replace(/={0,2}$/, '');
return !/[^\s0-9a-zA-Z\+/]/.test(s) || !/[^\s0-9a-zA-Z\-_]/.test(s);
};
//
const _noEnum = (v) => {
return {
value: v, enumerable: false, writable: true, configurable: true
};
};
/**
* extend String.prototype with relevant methods
*/
const extendString = function () {
const _add = (name, body) => Object.defineProperty(String.prototype, name, _noEnum(body));
_add('fromBase64', function () { return decode(this); });
_add('toBase64', function (urlsafe) { return encode(this, urlsafe); });
_add('toBase64URI', function () { return encode(this, true); });
_add('toBase64URL', function () { return encode(this, true); });
_add('toUint8Array', function () { return toUint8Array(this); });
};
/**
* extend Uint8Array.prototype with relevant methods
*/
const extendUint8Array = function () {
const _add = (name, body) => Object.defineProperty(Uint8Array.prototype, name, _noEnum(body));
_add('toBase64', function (urlsafe) { return fromUint8Array(this, urlsafe); });
_add('toBase64URI', function () { return fromUint8Array(this, true); });
_add('toBase64URL', function () { return fromUint8Array(this, true); });
};
/**
* extend Builtin prototypes with relevant methods
*/
const extendBuiltins = () => {
extendString();
extendUint8Array();
};
const gBase64 = {
version: version,
VERSION: VERSION,
atob: _atob,
atobPolyfill: atobPolyfill,
btoa: _btoa,
btoaPolyfill: btoaPolyfill,
fromBase64: decode,
toBase64: encode,
encode: encode,
encodeURI: encodeURI,
encodeURL: encodeURI,
utob: utob,
btou: btou,
decode: decode,
isValid: isValid,
fromUint8Array: fromUint8Array,
toUint8Array: toUint8Array,
extendString: extendString,
extendUint8Array: extendUint8Array,
extendBuiltins: extendBuiltins
};
// makecjs:CUT //
export { version };
export { VERSION };
export { _atob as atob };
export { atobPolyfill };
export { _btoa as btoa };
export { btoaPolyfill };
export { decode as fromBase64 };
export { encode as toBase64 };
export { utob };
export { encode };
export { encodeURI };
export { encodeURI as encodeURL };
export { btou };
export { decode };
export { isValid };
export { fromUint8Array };
export { toUint8Array };
export { extendString };
export { extendUint8Array };
export { extendBuiltins };
// and finally,
export { gBase64 as Base64 };

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{
"name": "js-base64",
"version": "3.7.7",
"description": "Yet another Base64 transcoder in pure-JS",
"main": "base64.js",
"module": "base64.mjs",
"types": "base64.d.ts",
"sideEffects": false,
"files": [
"base64.js",
"base64.mjs",
"base64.d.ts",
"base64.d.mts"
],
"exports": {
".": {
"import": {
"types": "./base64.d.mts",
"default": "./base64.mjs"
},
"require": {
"types": "./base64.d.ts",
"default": "./base64.js"
}
},
"./package.json": "./package.json"
},
"scripts": {
"test": "make clean && make test"
},
"devDependencies": {
"@types/node": "^20.11.5",
"mocha": "^10.2.0",
"typescript": "^5.3.3"
},
"repository": "git+https://github.com/dankogai/js-base64.git",
"keywords": [
"base64",
"binary"
],
"author": "Dan Kogai",
"license": "BSD-3-Clause"
}