applesingle/tools/asu/src/main/java/io/github/applecommander/applesingle/tools/asu/HexDumper.java

package io.github.applecommander.applesingle.tools.asu;

import java.io.PrintStream;
import java.util.Arrays;

/** A slightly-configurable reusable hex dumping mechanism. */
public class HexDumper {
	private PrintStream ps = System.out;
	private int lineWidth = 16;
	private LinePrinter printLine;
	
	public static HexDumper standard() {
		HexDumper hd = new HexDumper();
		hd.printLine = hd::standardLine;
		return hd;
	}
	public static HexDumper alternate(LinePrinter linePrinter) {
		HexDumper hd = new HexDumper();
		hd.printLine = linePrinter;
		return hd;
	}
	
	private HexDumper() {
		// Prevent construction
	}
	
	public void dump(int address, byte[] data, String description) {
		int offset = 0;
		while (offset < data.length) {
			byte[] line = Arrays.copyOfRange(data, offset, Math.min(offset+lineWidth,data.length));
			printLine.print(address+offset, line, description);
			description = "";	// Only on first line!
			offset += line.length;
		}
	}
	
	public void standardLine(int address, byte[] data, String description) {
		ps.printf("%04x: ", address);
		for (int i=0; i<lineWidth; i++) {
			if (i < data.length) {
				ps.printf("%02x ", data[i]);
			} else {
				ps.printf(".. ");
			}
		}
		ps.print("| ");
		for (int i=0; i<lineWidth; i++) {
			char ch = ' ';
			if (i < data.length) {
				byte b = data[i];
				ch = (b >= ' ' && Byte.toUnsignedInt(b) != 0xff) ? (char)b : '.';
			}
			ps.printf("%c", ch);
		}
		ps.printf(" | %s\n", description);
	}
	
	@FunctionalInterface
	public interface LinePrinter {
		public void print(int address, byte[] data, String description);
	}
}