Verify CRCs on login,

src/org/apollo/Server.java

@@ -122,8 +122,9 @@ public final class Server {
 	public void init(String releaseClassName) throws Exception {
 		Class<?> clazz = Class.forName(releaseClassName);
 		Release release = (Release) clazz.newInstance();
+		int releaseNo = release.getReleaseNumber();
 
-		logger.info("Initialized release #" + release.getReleaseNumber() + ".");
+		logger.info("Initialized release #" + releaseNo + ".");
 
 		serviceBootstrap.group(loopGroup);
 		httpBootstrap.group(loopGroup);
@@ -131,7 +132,8 @@ public final class Server {
 
 		World world = new World();
 		ServiceManager serviceManager = new ServiceManager(world);
-		ServerContext context = new ServerContext(release, serviceManager);
+		IndexedFileSystem fs = new IndexedFileSystem(Paths.get("data/fs", Integer.toString(releaseNo)), true);
+		ServerContext context = new ServerContext(release, serviceManager, fs);
 		ApolloHandler handler = new ApolloHandler(context);
 
 		ChannelInitializer<SocketChannel> serviceInitializer = new ServiceChannelInitializer(handler);
@@ -149,8 +151,6 @@ public final class Server {
 		PluginManager manager = new PluginManager(world, new PluginContext(context));
 		serviceManager.startAll();
 
-		int releaseNo = release.getReleaseNumber();
-		IndexedFileSystem fs = new IndexedFileSystem(Paths.get("data/fs", Integer.toString(releaseNo)), true);
 		world.init(releaseNo, fs, manager);
 	}
 

src/org/apollo/ServerContext.java

@@ -1,5 +1,6 @@
 package org.apollo;
 
+import org.apollo.fs.IndexedFileSystem;
 import org.apollo.net.release.Release;
 
 /**
@@ -21,16 +22,22 @@ public final class ServerContext {
 	 */
 	private final ServiceManager serviceManager;
 
+	/**
+	 * The IndexedFileSystem.
+	 */
+	private final IndexedFileSystem fileSystem;
+
 	/**
 	 * Creates a new server context.
 	 *
 	 * @param release The current release.
 	 * @param serviceManager The service manager.
 	 */
-	ServerContext(Release release, ServiceManager serviceManager) {
+	ServerContext(Release release, ServiceManager serviceManager, IndexedFileSystem fileSystem) {
 		this.release = release;
 		this.serviceManager = serviceManager;
 		this.serviceManager.setContext(this);
+		this.fileSystem = fileSystem;
 	}
 
 	/**
@@ -42,6 +49,15 @@ public final class ServerContext {
 		return release;
 	}
 
+	/**
+	 * Gets the IndexeFileSystem
+	 *
+	 * @return The IndexedFileSystem.
+	 */
+	public IndexedFileSystem getFileSystem() {
+		return fileSystem;
+	}
+
 	/**
 	 * Gets a service. This method is shorthand for {@code getServiceManager().getService(...)}.
 	 *

src/org/apollo/login/LoginService.java

@@ -3,6 +3,8 @@ package org.apollo.login;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.nio.ByteBuffer;
+import java.util.Arrays;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 
@@ -16,12 +18,11 @@ import org.apollo.net.codec.login.LoginRequest;
 import org.apollo.net.release.Release;
 import org.apollo.net.session.GameSession;
 import org.apollo.net.session.LoginSession;
+import org.apollo.util.ThreadUtil;
 import org.apollo.util.xml.XmlNode;
 import org.apollo.util.xml.XmlParser;
 import org.xml.sax.SAXException;
 
-import com.google.common.util.concurrent.ThreadFactoryBuilder;
-
 /**
  * The {@link LoginService} manages {@link LoginRequest}s.
  *
@@ -33,7 +34,7 @@ public final class LoginService extends Service {
 	/**
 	 * The {@link ExecutorService} to which workers are submitted.
 	 */
-	private final ExecutorService executor = Executors.newCachedThreadPool(new ThreadFactoryBuilder().setNameFormat("LoginService").build());
+	private final ExecutorService executor = Executors.newCachedThreadPool(ThreadUtil.build("LoginService"));
 
 	/**
 	 * The current {@link PlayerSerializer}.
@@ -79,9 +80,6 @@ public final class LoginService extends Service {
 		this.serializer = (PlayerSerializer) clazz.getConstructor(World.class).newInstance(world);
 	}
 
-	/**
-	 * Starts the login service.
-	 */
 	@Override
 	public void start() {
 
@@ -92,15 +90,48 @@ public final class LoginService extends Service {
 	 *
 	 * @param session The session submitting this request.
 	 * @param request The login request.
+	 * @throws IOException If some I/O exception occurs.
 	 */
-	public void submitLoadRequest(LoginSession session, LoginRequest request) {
+	public void submitLoadRequest(LoginSession session, LoginRequest request) throws IOException {
+		int response = LoginConstants.STATUS_OK;
+
+		if (requiresUpdate(session, request)) {
+			response = LoginConstants.STATUS_GAME_UPDATED;
+		}
+
+		if (response == LoginConstants.STATUS_OK) {
+			executor.submit(new PlayerLoaderWorker(serializer, session, request));
+		} else {
+			session.handlePlayerLoaderResponse(request, new PlayerLoaderResponse(response));
+		}
+	}
+
+	/**
+	 * Checks if an update is required whenever a {@link Player} submits a login request.
+	 *
+	 * @param session The login session.
+	 * @param request The login request.
+	 * @return {@code true} if an update is required, otherwise return {@code false}.
+	 * @throws IOException If some I/O exception occurs.
+	 */
+	private boolean requiresUpdate(LoginSession session, LoginRequest request) throws IOException {
 		Release release = session.getRelease();
 		if (release.getReleaseNumber() != request.getReleaseNumber()) {
-			// TODO check archive 0 CRCs
+			return true;
-			session.handlePlayerLoaderResponse(request, new PlayerLoaderResponse(LoginConstants.STATUS_GAME_UPDATED));
-		} else {
-			executor.submit(new PlayerLoaderWorker(serializer, session, request));
 		}
+
+		ByteBuffer buffer = getContext().getFileSystem().getCrcTable();
+
+		int[] clientCrcs = request.getArchiveCrcs();
+		int[] serverCrcs = new int[clientCrcs.length];
+
+		Arrays.setAll(serverCrcs, crc -> buffer.getInt());
+
+		if (Arrays.equals(clientCrcs, serverCrcs)) {
+			return false;
+		}
+
+		return true;
 	}
 
 	/**

src/org/apollo/net/ApolloHandler.java

@@ -66,7 +66,7 @@ public final class ApolloHandler extends ChannelInboundHandlerAdapter {
 	}
 
 	@Override
-	public void channelRead(ChannelHandlerContext ctx, Object message) {
+	public void channelRead(ChannelHandlerContext ctx, Object message) throws Exception {
 		try {
 			Attribute<Session> attribute = ctx.attr(NetworkConstants.SESSION_KEY);
 			Session session = attribute.get();

src/org/apollo/net/session/LoginSession.java

@@ -5,6 +5,7 @@ import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelFutureListener;
 import io.netty.channel.ChannelHandlerContext;
 
+import java.io.IOException;
 import java.util.Optional;
 
 import org.apollo.ServerContext;
@@ -72,8 +73,9 @@ public final class LoginSession extends Session {
 	 * Handles a login request.
 	 *
 	 * @param request The login request.
+	 * @throws IOException If some I/O exception occurs.
 	 */
-	private void handleLoginRequest(LoginRequest request) {
+	private void handleLoginRequest(LoginRequest request) throws IOException {
 		LoginService loginService = serverContext.getService(LoginService.class);
 		loginService.submitLoadRequest(this, request);
 	}
@@ -135,7 +137,7 @@ public final class LoginSession extends Session {
 	}
 
 	@Override
-	public void messageReceived(Object message) {
+	public void messageReceived(Object message) throws Exception {
 		if (message.getClass() == LoginRequest.class) {
 			handleLoginRequest((LoginRequest) message);
 		}

src/org/apollo/net/session/Session.java

@@ -42,7 +42,8 @@ public abstract class Session {
 	 * Processes a message received from the channel.
 	 *
 	 * @param message The message.
+	 * @throws Exception If some error occurs.
 	 */
-	public abstract void messageReceived(Object message);
+	public abstract void messageReceived(Object message) throws Exception;
 
 }