arcade-physics
Version:
Use Arcade Physics without Phaser.
55 lines • 2.06 kB
JavaScript
;
/**
* @author Niklas von Hertzen (https://github.com/niklasvh/base64-arraybuffer)
* @author Richard Davey <rich@photonstorm.com>
* @copyright 2020 Photon Storm Ltd.
* @license {@link https://opensource.org/licenses/MIT|MIT License}
*/
Object.defineProperty(exports, "__esModule", { value: true });
const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
// Use a lookup table to find the index.
const lookup = new Uint8Array(256);
for (let i = 0; i < chars.length; i++) {
lookup[chars.charCodeAt(i)] = i;
}
/**
* Converts a base64 string, either with or without a data uri, into an Array Buffer.
*
* @function Phaser.Utils.Base64.Base64ToArrayBuffer
* @since 3.18.0
*
* @param {string} base64 - The base64 string to be decoded. Can optionally contain a data URI header, which will be stripped out prior to decoding.
*
* @return {ArrayBuffer} An ArrayBuffer decoded from the base64 data.
*/
const Base64ToArrayBuffer = base64 => {
// Is it a data uri? if so, strip the header away
base64 = base64.substr(base64.indexOf(',') + 1);
const len = base64.length;
let bufferLength = len * 0.75;
let p = 0;
let encoded1;
let encoded2;
let encoded3;
let encoded4;
if (base64[len - 1] === '=') {
bufferLength--;
if (base64[len - 2] === '=') {
bufferLength--;
}
}
const arrayBuffer = new ArrayBuffer(bufferLength);
const bytes = new Uint8Array(arrayBuffer);
for (let 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.default = Base64ToArrayBuffer;
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