src/lib/check-dduf.ts

import { WebBlob } from './WebBlob';

export async function* checkDduf(url: string): AsyncGenerator<string> {
	const blob = await WebBlob.create(new URL(url));

	yield 'File size: ' + blob.size;

	// DDUF is a zip file, uncompressed.

	const last100kb = await blob.slice(blob.size - 100000, blob.size).arrayBuffer();

	const view = new DataView(last100kb);

	let index = view.byteLength - 22;
}