/******************************************************************************
 * This program reads bytes from a file and prints them in hexadecimal format.
 * 
 * Copyright © 2021 Richard Lesh.  All rights reserved.
 *****************************************************************************/

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import org.pureprogrammer.Utils;

public class FileIO3 {

	static void readBinaryFile(String filespec) throws IOException {
		BufferedInputStream ifh = new BufferedInputStream(new FileInputStream(filespec));
		int c;
		int count = 0;
		while ((c = Utils.getbyte(ifh)) != -1) {
			System.out.print(Utils.format("{0:02x} ", c));
			++count;
			if (count % 16 == 0) {
				System.out.println();
			}
		}
		if (count % 16 != 0) {
			System.out.println();
		}
		try {ifh.close();} catch (IOException ex) {};
	}

	public static void main(String[] args) {
		if (args.length != 1) {
			System.out.println(Utils.join("", "Syntax: ", "FileIO3", " {filename}"));
			System.exit(1);
		}
		final String FILESPEC = args[0];
		try {
			readBinaryFile(FILESPEC);
		} catch (IOException ex) {
			System.out.println(Utils.join("", "Error: ", Utils.exceptionMessage(ex)));
		} catch (Exception ex) {
			System.out.println("Unexpected File Read Error");
		}
	}
}