lazy-js-utils/dist/createChunk-CBgu98Zd.js

A collection of lazy-loaded JavaScript utilities for efficient development

import SparkMD5 from "spark-md5";

//#region src/perf/createChunk.ts
const hashMap = new Map();
function createChunk(file, index, chunkSize) {
	return new Promise((resolve) => {
		const start = index * chunkSize;
		const end = start + chunkSize;
		const spark = new SparkMD5.ArrayBuffer();
		const fileReader = new FileReader();
		fileReader.onload = (e) => {
			var _e$target;
			const fileBuffer = (_e$target = e.target) === null || _e$target === void 0 ? void 0 : _e$target.result;
			let hash;
			if (!hashMap.has(fileBuffer)) {
				spark.append(fileBuffer);
				hash = spark.end();
			} else hash = hashMap.get(fileBuffer);
			resolve({
				start,
				end,
				index,
				hash
			});
		};
		fileReader.readAsArrayBuffer(file.slice(start, end));
	});
}

//#endregion
export { createChunk as createChunk$1 };