Reverse Packer

[Sean2012]

Hello could someone teach/help me how to reverse this java file. It packs a txt file into a bunch of other files and I would like to be able to reverse it. Willing to learn!

package com.rs.utils;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileChannel.MapMode;

import com.rs.game.World;
import com.rs.game.WorldTile;

public final class NPCSpawns {

	public static final void init() {
		if (!new File("data/npcs/packedSpawns").exists())
			packNPCSpawns();
	}

	private static final void packNPCSpawns() {
		Logger.log("NPCSpawns", "Packing npc spawns...");
		if (!new File("data/npcs/packedSpawns").mkdir())
			throw new RuntimeException(
					"Couldn't create packedSpawns directory.");
		try {
			BufferedReader in = new BufferedReader(new FileReader(
					"data/npcs/unpackedSpawnsList.txt"));
			while (true) {
				String line = in.readLine();
				if (line == null)
					break;
				if (line.startsWith("//"))
					continue;
				String[] splitedLine = line.split(" - ", 2);
				if (splitedLine.length != 2)
					throw new RuntimeException("Invalid NPC Spawn line: "
							+ line);
				int npcId = Integer.parseInt(splitedLine[0]);
				String[] splitedLine2 = splitedLine[1].split(" ", 5);
				if (splitedLine2.length != 3 && splitedLine2.length != 5)
					throw new RuntimeException("Invalid NPC Spawn line: "
							+ line);
				WorldTile tile = new WorldTile(
						Integer.parseInt(splitedLine2[0]),
						Integer.parseInt(splitedLine2[1]),
						Integer.parseInt(splitedLine2[2]));
				int mapAreaNameHash = -1;
				boolean canBeAttackFromOutOfArea = true;
				if (splitedLine2.length == 5) {
					mapAreaNameHash = Utils.getNameHash(splitedLine2[3]);
					canBeAttackFromOutOfArea = Boolean
							.parseBoolean(splitedLine2[4]);
				}
				addNPCSpawn(npcId, tile.getRegionId(), tile, mapAreaNameHash,
						canBeAttackFromOutOfArea);
			}
			in.close();
		} catch (Throwable e) {
			Logger.handle(e);
		}
	}

	public static final void loadNPCSpawns(int regionId) {
		File file = new File("data/npcs/packedSpawns/" + regionId + ".ns");
		if (!file.exists())
			return;
		try {
			RandomAccessFile in = new RandomAccessFile(file, "r");
			FileChannel channel = in.getChannel();
			ByteBuffer buffer = channel.map(MapMode.READ_ONLY, 0,
					channel.size());
			while (buffer.hasRemaining()) {
				int npcId = buffer.getShort() & 0xffff;
				int plane = buffer.get() & 0xff;
				int x = buffer.getShort() & 0xffff;
				int y = buffer.getShort() & 0xffff;
				boolean hashExtraInformation = buffer.get() == 1;
				int mapAreaNameHash = -1;
				boolean canBeAttackFromOutOfArea = true;
				if (hashExtraInformation) {
					mapAreaNameHash = buffer.getInt();
					canBeAttackFromOutOfArea = buffer.get() == 1;
				}
				World.spawnNPC(npcId, new WorldTile(x, y, plane),
						mapAreaNameHash, canBeAttackFromOutOfArea);
			}
			channel.close();
			in.close();
		} catch (Throwable e) {
			Logger.handle(e);
		}
	}

	private static final void addNPCSpawn(int npcId, int regionId,
			WorldTile tile, int mapAreaNameHash,
			boolean canBeAttackFromOutOfArea) {
		try {
			DataOutputStream out = new DataOutputStream(new FileOutputStream(
					"data/npcs/packedSpawns/" + regionId + ".ns", true));
			out.writeShort(npcId);
			out.writeByte(tile.getPlane());
			out.writeShort(tile.getX());
			out.writeShort(tile.getY());
			out.writeBoolean(mapAreaNameHash != -1);
			if (mapAreaNameHash != -1) {
				out.writeInt(mapAreaNameHash);
				out.writeBoolean(canBeAttackFromOutOfArea);
			}
			out.flush();
			out.close();
		} catch (Throwable e) {
			Logger.handle(e);
		}
	}

	private NPCSpawns() {
	}
}

Also have this if it helps.. Sorry i'm new to java

package com.rs.tools;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

import com.rs.cache.Cache;
import com.rs.io.InputStream;
import com.rs.utils.Logger;
import com.rs.utils.MapContainersXteas;

public class NPCSpawnsDumper {

	private static int writtenCount;

	public static final void main(String[] args) throws IOException {
		BufferedWriter out = new BufferedWriter(new FileWriter(
				"data/npcs/unpackedSpawnsList.txt", true));
		Logger.log("Launcher", "Initing Cache...");
		Cache.init();
		Logger.log("Launcher", "Initing Data File...");
		MapContainersXteas.init();
		for (int regionId = 0; regionId < 20000; regionId++) {
			//if (new File("data/npcs/packedSpawns/" + regionId + ".ns").exists())
				//continue;

			dumpRegionNPCs(regionId, out);
		}
		out.close();
		System.out.println("found " + writtenCount + " npc spawns on cache.");

	}

	public static final void dumpRegionNPCs(int regionId, BufferedWriter writer)
			throws IOException {
		writer.flush();
		int regionX = (regionId >> 8) * 64;
		int regionY = (regionId & 0xff) * 64;
		
		
		int npcSpawnsContainerId = Cache.STORE.getIndexes()[5].getArchiveId("n"
				+ ((regionX >> 3) / 8) + "_" + ((regionY >> 3) / 8));
		if (npcSpawnsContainerId == -1)
			return;
		byte[] npcSpawnsContainerData = Cache.STORE.getIndexes()[5].getFile(
				npcSpawnsContainerId, 0, null);
		if (npcSpawnsContainerData == null)
			return;
		System.out.println(regionId);
		InputStream stream = new InputStream(npcSpawnsContainerData);
		while (stream.getRemaining() > 0) {
			int hash = stream.readUnsignedShort();
			int npcId = stream.readUnsignedShort();
			int plane = hash >> 758085070;
			int localX = (0x1f92 & hash) >> -585992921;
			int x = regionX + localX;
			int localY = 0x3f & hash;
			int y = regionY + localY;
			writer.newLine();
			writer.write(npcId + ":" + x + ":" + y + ":" + plane);
			writer.flush();
			writtenCount++;
		}
	}

}

[mwr1976]

Sorry, no one here is going to reverse engineer this app for you. If you have a specific question about part of the code, I would segregate that code snippet and ask a specific question in regards to it.

[Sean2012]

Sorry, no one here is going to reverse engineer this app for you. If you have a specific question about part of the code, I would segregate that code snippet and ask a specific question in regards to it.

Okay sorry about that! I'll do it in snippets.