gistfile1.txt

package com.github.theresajayne.ovlreader;

import java.io.*;
import java.nio.ByteBuffer;

/**
 * Created by Theresa on 02/06/2015.
 */
public class OvlReader {

	public static void main(String[] args) throws IOException {
		OvlReader ovlReader = new OvlReader();
		ovlReader.open("d:/MilkyWay.ovl");

	}

	private void open(String s) throws IOException {
		File input = new File(s);
		if (!input.exists()) {
			System.out.println("File not found.");
			System.exit(0);
		}
		byte[] buf = new byte[(int) input.length()];
		FileInputStream fis = new FileInputStream(input);
		fis.read(buf, 0, (int) input.length());
		ByteBuffer byteBuffer = ByteBuffer.wrap(buf);

		//We should now have a bytebuffer containing the file.
		//Milkyway has an offset to the directory of 0x90
		//Factions also offset 0x90
		//Starsystems also. so we can assume that there may be no "offset" for the start of the directory.
		//Zlib offset in the files is as follows
		//Milkyway    0x0000037c
		//Factions    0x0000023c
		//Starsystems 0x0001ABB0
		// So try to find the offset to there
		//word STATIC is at 01e8 in Factions 54 bytes from zlib
		//Starsystems 0x001AB5C  (54 bytes from zlib)
		//MilkyWay    0x0000310  (6C bytes from zlib)
		//Read in the directory
		readDirectory(byteBuffer);

	}

	private void readDirectory(ByteBuffer buffer) {
		buffer.position(0x90);
		byte a;
		boolean lastnull = false;
		while (true) {
			a = buffer.get();
			if (a == 0x00 && lastnull) {
				break;
			}

			if (lastnull) {
				//end of string so put CR
				System.out.println("");
				lastnull = false;
			}
			if (a == 0x00) {
				lastnull = true;
			} else {
				System.out.print((char) a);
			}


		}
	}
}