#!/usr/bin/node
"use strict";
/* perl -wMstrict -le 'open my $fh, "<:raw", "5gig.iso" or die $!;
        seek($fh,0x8000,0) or die $!; read($fh,my $buf,512)==512
        or die; print unpack("H*",$buf)' */
// https://nodejs.org/docs/latest-v12.x/api/fs.html
const fs = require('fs');
fs.open( '5gig.iso', 'r', function (err, fd) {
		if (err) throw err;
		var buf = Buffer.alloc(512);
		fs.read(fd, buf, 0, buf.length, 0x8000,
			function (err, bytesRead, buffer) {
				if (err) throw err;
				if (bytesRead!=buf.length)
					throw "not enough bytes read!";
				console.log(buffer.toString('hex'));
			});
	} );