62 lines
2.6 KiB
JavaScript
62 lines
2.6 KiB
JavaScript
|
/*
|
||
|
|
* base64-arraybuffer 1.0.2 <https://github.com/niklasvh/base64-arraybuffer>
|
||
|
|
* Copyright (c) 2022 Niklas von Hertzen <https://hertzen.com>
|
||
|
|
* Released under MIT License
|
||
|
|
*/
|
||
|
|
(function (global, factory) {
|
||
|
|
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
|
||
|
|
typeof define === 'function' && define.amd ? define(['exports'], factory) :
|
||
|
|
(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global['base64-arraybuffer'] = {}));
|
||
|
|
}(this, (function (exports) { 'use strict';
|
||
|
|
|
||
|
|
var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
|
||
|
|
// Use a lookup table to find the index.
|
||
|
|
var lookup = typeof Uint8Array === 'undefined' ? [] : new Uint8Array(256);
|
||
|
|
for (var i = 0; i < chars.length; i++) {
|
||
|
|
lookup[chars.charCodeAt(i)] = i;
|
||
|
|
}
|
||
|
|
var encode = function (arraybuffer) {
|
||
|
|
var bytes = new Uint8Array(arraybuffer), i, len = bytes.length, base64 = '';
|
||
|
|
for (i = 0; i < len; i += 3) {
|
||
|
|
base64 += chars[bytes[i] >> 2];
|
||
|
|
base64 += chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];
|
||
|
|
base64 += chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];
|
||
|
|
base64 += chars[bytes[i + 2] & 63];
|
||
|
|
}
|
||
|
|
if (len % 3 === 2) {
|
||
|
|
base64 = base64.substring(0, base64.length - 1) + '=';
|
||
|
|
}
|
||
|
|
else if (len % 3 === 1) {
|
||
|
|
base64 = base64.substring(0, base64.length - 2) + '==';
|
||
|
|
}
|
||
|
|
return base64;
|
||
|
|
};
|
||
|
|
var decode = function (base64) {
|
||
|
|
var bufferLength = base64.length * 0.75, len = base64.length, i, p = 0, encoded1, encoded2, encoded3, encoded4;
|
||
|
|
if (base64[base64.length - 1] === '=') {
|
||
|
|
bufferLength--;
|
||
|
|
if (base64[base64.length - 2] === '=') {
|
||
|
|
bufferLength--;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
var arraybuffer = new ArrayBuffer(bufferLength), bytes = new Uint8Array(arraybuffer);
|
||
|
|
for (i = 0; i < len; i += 4) {
|
||
|
|
encoded1 = lookup[base64.charCodeAt(i)];
|
||
|
|
encoded2 = lookup[base64.charCodeAt(i + 1)];
|
||
|
|
encoded3 = lookup[base64.charCodeAt(i + 2)];
|
||
|
|
encoded4 = lookup[base64.charCodeAt(i + 3)];
|
||
|
|
bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);
|
||
|
|
bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);
|
||
|
|
bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);
|
||
|
|
}
|
||
|
|
return arraybuffer;
|
||
|
|
};
|
||
|
|
|
||
|
|
exports.decode = decode;
|
||
|
|
exports.encode = encode;
|
||
|
|
|
||
|
|
Object.defineProperty(exports, '__esModule', { value: true });
|
||
|
|
|
||
|
|
})));
|
||
|
|
//# sourceMappingURL=base64-arraybuffer.umd.js.map
|