14w04b

README.md

@@ -20,7 +20,7 @@ See ch.spacebase.mc.protocol.test.Test.
 --------
 
 MCProtocolLib uses Maven to manage dependencies. Simply run 'mvn clean install' in the source's directory.
-You can also download a build <b>[here](http://build.spacebase.ch/job/MCProtocolLib14w03b/)</b>.
+You can also download a build <b>[here](http://build.spacebase.ch/job/MCProtocolLib14w04b/)</b>.
 
 
 <b>License</b>

pom.xml

@@ -4,7 +4,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>ch.spacebase</groupId>
 	<artifactId>mcprotocollib</artifactId>
-	<version>14w03b-SNAPSHOT</version>
+	<version>14w04b-SNAPSHOT</version>
 	<packaging>jar</packaging>
 
 	<name>MCProtocolLib</name>
@@ -85,6 +85,13 @@
 	<build>
 		<defaultGoal>clean install</defaultGoal>
 		<sourceDirectory>${basedir}/src/main/java</sourceDirectory>
+		<!-- Resources -->
+		<resources>
+			<resource>
+				<directory>${basedir}/src/main/resources</directory>
+				<filtering>false</filtering>
+			</resource>
+		</resources>
 		<plugins>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>

src/main/java/ch/spacebase/mc/auth/GameProfile.java

@@ -1,9 +1,14 @@
 package ch.spacebase.mc.auth;
 
+import java.util.HashMap;
+import java.util.Map;
+
 public class GameProfile {
 
 	private String id;
 	private String name;
+	private Map<String, ProfileProperty> properties = new HashMap<String, ProfileProperty>();
+	private boolean legacy;
 
 	public GameProfile(String id, String name) {
 		if((id == null || id.equals("")) && (name == null || name.equals(""))) {
@@ -21,6 +26,14 @@ public class GameProfile {
 	public String getName() {
 		return this.name;
 	}
+	
+	public Map<String, ProfileProperty> getProperties() {
+		return this.properties;
+	}
+	
+	public boolean isLegacy() {
+		return this.legacy;
+	}
 
 	public boolean isComplete() {
 		return this.id != null && !this.id.equals("") && this.name != null && !this.name.equals("");

src/main/java/ch/spacebase/mc/auth/ProfileProperty.java

@@ -0,0 +1,54 @@
+package ch.spacebase.mc.auth;
+
+import java.security.PublicKey;
+import java.security.Signature;
+
+import ch.spacebase.mc.util.Base64;
+
+public class ProfileProperty {
+
+	private String name;
+	private String value;
+	private String signature;
+
+	public ProfileProperty(String value, String name) {
+		this(value, name, null);
+	}
+
+	public ProfileProperty(String name, String value, String signature) {
+		this.name = name;
+		this.value = value;
+		this.signature = signature;
+	}
+
+	public String getName() {
+		return this.name;
+	}
+
+	public String getValue() {
+		return this.value;
+	}
+
+	public String getSignature() {
+		return this.signature;
+	}
+
+	public boolean hasSignature() {
+		return this.signature != null;
+	}
+
+	public boolean isSignatureValid(PublicKey key) {
+		try {
+			Signature sig = Signature.getInstance("SHA1withRSA");
+			sig.initVerify(key);
+			sig.update(this.value.getBytes());
+			return sig.verify(Base64.decode(this.signature.getBytes("UTF-8")));
+		} catch(Exception e) {
+			System.err.println("Failed to check profile property signature validity.");
+			e.printStackTrace();
+		}
+
+		return false;
+	}
+	
+}

src/main/java/ch/spacebase/mc/auth/ProfileTexture.java

@@ -0,0 +1,31 @@
+package ch.spacebase.mc.auth;
+
+public class ProfileTexture {
+
+	private String url;
+
+	public ProfileTexture(String url) {
+		this.url = url;
+	}
+
+	public String getUrl() {
+		return this.url;
+	}
+
+	public String getHash() {
+		String url = this.url.endsWith("/") ? this.url.substring(0, this.url.length() - 1) : this.url;
+		int slash = url.lastIndexOf("/");
+		int dot = url.lastIndexOf(".", slash);
+		return url.substring(slash + 1, dot != -1 ? dot : url.length());
+	}
+
+	public String toString() {
+		return "ProfileTexture{url=" + this.url + ", hash=" + this.getHash() + "}";
+	}
+
+	public static enum Type {
+		SKIN,
+		CAPE;
+	}
+	
+}

src/main/java/ch/spacebase/mc/auth/SessionService.java

@@ -4,18 +4,38 @@ import ch.spacebase.mc.auth.exceptions.AuthenticationException;
 import ch.spacebase.mc.auth.exceptions.AuthenticationUnavailableException;
 import ch.spacebase.mc.auth.request.JoinServerRequest;
 import ch.spacebase.mc.auth.response.HasJoinedResponse;
+import ch.spacebase.mc.auth.response.MinecraftTexturesPayload;
 import ch.spacebase.mc.auth.response.Response;
+import ch.spacebase.mc.util.Base64;
+import ch.spacebase.mc.util.IOUtils;
 import ch.spacebase.mc.util.URLUtils;
 
 import java.net.URL;
+import java.security.KeyFactory;
+import java.security.PublicKey;
+import java.security.spec.X509EncodedKeySpec;
 import java.util.HashMap;
 import java.util.Map;
 
+import com.google.gson.Gson;
+
 public class SessionService {
 
 	private static final String BASE_URL = "https://sessionserver.mojang.com/session/minecraft/";
 	private static final URL JOIN_URL = URLUtils.constantURL(BASE_URL + "join");
 	private static final URL CHECK_URL = URLUtils.constantURL(BASE_URL + "hasJoined");
+	
+	private static final PublicKey SIGNATURE_KEY;
+
+	static {
+		try {
+			X509EncodedKeySpec spec = new X509EncodedKeySpec(IOUtils.toByteArray(SessionService.class.getResourceAsStream("/yggdrasil_session_pubkey.der")));
+			KeyFactory keyFactory = KeyFactory.getInstance("RSA");
+			SIGNATURE_KEY = keyFactory.generatePublic(spec);
+		} catch(Exception var4) {
+			throw new ExceptionInInitializerError("Missing/invalid yggdrasil public key.");
+		}
+	}
 
 	public void joinServer(GameProfile profile, String authenticationToken, String serverId) throws AuthenticationException {
 		JoinServerRequest request = new JoinServerRequest(authenticationToken, profile.getId(), serverId);
@@ -28,8 +48,19 @@ public class SessionService {
 		arguments.put("serverId", serverId);
 		URL url = URLUtils.concatenateURL(CHECK_URL, URLUtils.buildQuery(arguments));
 		try {
-			HasJoinedResponse e = URLUtils.makeRequest(url, null, HasJoinedResponse.class);
-			return e != null && e.getId() != null ? new GameProfile(e.getId(), user.getName()) : null;
+			HasJoinedResponse response = URLUtils.makeRequest(url, null, HasJoinedResponse.class);
+			if(response != null && response.getId() != null) {
+				GameProfile result = new GameProfile(response.getId(), user.getName());
+				if(response.getProperties() != null) {
+					for(ProfileProperty prop : response.getProperties()) {
+						result.getProperties().put(prop.getName(), prop);
+					}
+				}
+				
+				return result;
+			} else {
+				return null;
+			}
 		} catch(AuthenticationUnavailableException var6) {
 			throw var6;
 		} catch(AuthenticationException var7) {
@@ -37,6 +68,41 @@ public class SessionService {
 		}
 	}
 	
+	public Map<String, ProfileTexture> getTextures(GameProfile profile) {
+		ProfileProperty textures = profile.getProperties().get("textures");
+		if(textures == null) {
+			return new HashMap<String, ProfileTexture>();
+		} else if(!textures.hasSignature()) {
+			System.err.println("Signature is missing from textures payload.");
+			return new HashMap<String, ProfileTexture>();
+		} else if(!textures.isSignatureValid(SIGNATURE_KEY)) {
+			System.err.println("Textures payload has been tampered with. (signature invalid)");
+			return new HashMap<String, ProfileTexture>();
+		} else {
+			MinecraftTexturesPayload result;
+			try {
+				String e = new String(Base64.decode(textures.getValue().getBytes("UTF-8")));
+				result = new Gson().fromJson(e, MinecraftTexturesPayload.class);
+			} catch(Exception e) {
+				System.err.println("Could not decode textures payload.");
+				e.printStackTrace();
+				return new HashMap<String, ProfileTexture>();
+			}
+
+			if(result.getProfileId() != null && result.getProfileId().equals(profile.getId())) {
+				if(result.getProfileName() != null && result.getProfileName().equals(profile.getName())) {
+					return result.getTextures() == null ? new HashMap<String, ProfileTexture>() : result.getTextures();
+				} else {
+					System.err.println("Decrypted textures payload was for another user. (expected name " + profile.getName() + " but was for " + result.getProfileName() + ")");
+					return new HashMap<String, ProfileTexture>();
+				}
+			} else {
+				System.err.println("Decrypted textures payload was for another user. (expected id " + profile.getId() + " but was for " + result.getProfileId() + ")");
+				return new HashMap<String, ProfileTexture>();
+			}
+		}
+	}
+
 	@Override
 	public String toString() {
 		return "SessionService{}";

src/main/java/ch/spacebase/mc/auth/UserAuthentication.java

@@ -7,6 +7,7 @@ import ch.spacebase.mc.auth.request.RefreshRequest;
 import ch.spacebase.mc.auth.response.AuthenticationResponse;
 import ch.spacebase.mc.auth.response.RefreshResponse;
 import ch.spacebase.mc.auth.response.User;
+import ch.spacebase.mc.auth.response.User.Property;
 import ch.spacebase.mc.util.URLUtils;
 
 import java.net.URL;
@@ -14,7 +15,6 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;
-import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 
@@ -30,7 +30,7 @@ public class UserAuthentication {
 	private static final String STORAGE_KEY_ACCESS_TOKEN = "accessToken";
 	
 	private String clientToken;
-	private Map<String, String> userProperties = new HashMap<String, String>();
+	private Map<String, List<String>> userProperties = new HashMap<String, List<String>>();
 	private String userId;
 	private String username;
 	private String password;
@@ -38,6 +38,7 @@ public class UserAuthentication {
 	private boolean isOnline;
 	private List<GameProfile> profiles = new ArrayList<GameProfile>();
 	private GameProfile selectedProfile;
+	private UserType userType;
 
 	public UserAuthentication(String clientToken) {
 		if(clientToken == null) {
@@ -67,8 +68,12 @@ public class UserAuthentication {
 		return this.selectedProfile;
 	}
 	
-	public Map<String, String> getUserProperties() {
-		return this.isLoggedIn() ? Collections.unmodifiableMap(this.userProperties) : Collections.unmodifiableMap(new HashMap<String, String>());
+	public UserType getUserType() {
+		return this.isLoggedIn() ? (this.userType == null ? UserType.LEGACY : this.userType) : null;
+	}
+
+	public Map<String, List<String>> getUserProperties() {
+		return this.isLoggedIn() ? Collections.unmodifiableMap(this.userProperties) : Collections.unmodifiableMap(new HashMap<String, List<String>>());
 	}
 	
 	public boolean isLoggedIn() {
@@ -170,8 +175,14 @@ public class UserAuthentication {
 			AuthenticationRequest request = new AuthenticationRequest(this, this.username, this.password);
 			AuthenticationResponse response = URLUtils.makeRequest(ROUTE_AUTHENTICATE, request, AuthenticationResponse.class);
 			if(!response.getClientToken().equals(this.getClientToken())) {
-				throw new AuthenticationException("Server requested we change our client token. Don\'t know how to handle this!");
+				throw new AuthenticationException("Server requested we change our client token. Don't know how to handle this!");
 			} else {
+				if(response.getSelectedProfile() != null) {
+					this.userType = response.getSelectedProfile().isLegacy() ? UserType.LEGACY : UserType.MOJANG;
+				} else if(response.getAvailableProfiles() != null && response.getAvailableProfiles().length != 0) {
+					this.userType = response.getAvailableProfiles()[0].isLegacy() ? UserType.LEGACY : UserType.MOJANG;
+				}
+
 				if(response.getUser() != null && response.getUser().getId() != null) {
 					this.userId = response.getUser().getId();
 				} else {
@@ -182,14 +193,7 @@ public class UserAuthentication {
 				this.accessToken = response.getAccessToken();
 				this.profiles = Arrays.asList(response.getAvailableProfiles());
 				this.selectedProfile = response.getSelectedProfile();
-				this.userProperties.clear();
-				if(response.getUser() != null && response.getUser().getProperties() != null) {
-					Iterator<User.Property> it = response.getUser().getProperties().iterator();
-					while(it.hasNext()) {
-						User.Property property = it.next();
-						this.userProperties.put(property.getKey(), property.getValue());
-					}
-				}
+				this.updateProperties(response.getUser());
 			}
 		}
 	}
@@ -209,8 +213,14 @@ public class UserAuthentication {
 			RefreshRequest request = new RefreshRequest(this);
 			RefreshResponse response = URLUtils.makeRequest(ROUTE_REFRESH, request, RefreshResponse.class);
 			if(!response.getClientToken().equals(this.getClientToken())) {
-				throw new AuthenticationException("Server requested we change our client token. Don\'t know how to handle this!");
+				throw new AuthenticationException("Server requested we change our client token. Don't know how to handle this!");
 			} else {
+				if(response.getSelectedProfile() != null) {
+					this.userType = response.getSelectedProfile().isLegacy() ? UserType.LEGACY : UserType.MOJANG;
+				} else if(response.getAvailableProfiles() != null && response.getAvailableProfiles().length != 0) {
+					this.userType = response.getAvailableProfiles()[0].isLegacy() ? UserType.LEGACY : UserType.MOJANG;
+				}
+				
 				if(response.getUser() != null && response.getUser().getId() != null) {
 					this.userId = response.getUser().getId();
 				} else {
@@ -221,15 +231,7 @@ public class UserAuthentication {
 				this.accessToken = response.getAccessToken();
 				this.profiles = Arrays.asList(response.getAvailableProfiles());
 				this.selectedProfile = response.getSelectedProfile();
-				this.userProperties.clear();
-				if(response.getUser() != null && response.getUser().getProperties() != null) {
-					Iterator<User.Property> it = response.getUser().getProperties().iterator();
-					while(it.hasNext()) {
-						User.Property property = it.next();
-						this.userProperties.put(property.getKey(), property.getValue());
-					}
-				}
-
+				this.updateProperties(response.getUser());
 			}
 		}
 	}
@@ -242,6 +244,7 @@ public class UserAuthentication {
 		this.accessToken = null;
 		this.profiles = null;
 		this.isOnline = false;
+		this.userType = null;
 	}
 
 	public void selectGameProfile(GameProfile profile) throws AuthenticationException {
@@ -253,14 +256,14 @@ public class UserAuthentication {
 			RefreshRequest request = new RefreshRequest(this, profile);
 			RefreshResponse response = URLUtils.makeRequest(ROUTE_REFRESH, request, RefreshResponse.class);
 			if(!response.getClientToken().equals(this.getClientToken())) {
-				throw new AuthenticationException("Server requested we change our client token. Don\'t know how to handle this!");
+				throw new AuthenticationException("Server requested we change our client token. Don't know how to handle this!");
 			} else {
 				this.isOnline = true;
 				this.accessToken = response.getAccessToken();
 				this.selectedProfile = response.getSelectedProfile();
 			}
 		} else {
-			throw new IllegalArgumentException("Invalid profile \'" + profile + "\'");
+			throw new IllegalArgumentException("Invalid profile '" + profile + "'");
 		}
 	}
 
@@ -268,5 +271,18 @@ public class UserAuthentication {
 	public String toString() {
 		return "UserAuthentication{profiles=" + this.profiles + ", selectedProfile=" + this.getSelectedProfile() + ", username=" + this.username + ", isLoggedIn=" + this.isLoggedIn() + ", canPlayOnline=" + this.canPlayOnline() + ", accessToken=" + this.accessToken + ", clientToken=" + this.getClientToken() + "}";
 	}
+	
+	private void updateProperties(User user) {
+		this.userProperties.clear();
+		if(user != null && user.getProperties() != null) {
+			for(Property property : user.getProperties()) {
+				if(this.userProperties.get(property.getKey()) == null) {
+					this.userProperties.put(property.getKey(), new ArrayList<String>());
+				}
+				
+				this.userProperties.get(property.getKey()).add(property.getValue());
+			}
+		}
+	}
 
 }

src/main/java/ch/spacebase/mc/auth/UserType.java

@@ -0,0 +1,8 @@
+package ch.spacebase.mc.auth;
+
+public enum UserType {
+
+	LEGACY,
+	MOJANG;
+
+}

src/main/java/ch/spacebase/mc/auth/response/HasJoinedResponse.java

@@ -1,13 +1,21 @@
 package ch.spacebase.mc.auth.response;
 
+import java.util.List;
+
+import ch.spacebase.mc.auth.ProfileProperty;
 import ch.spacebase.mc.auth.response.Response;
 
 public class HasJoinedResponse extends Response {
 
 	private String id;
+	private List<ProfileProperty> properties;
 
 	public String getId() {
 		return this.id;
 	}
 	
+	public List<ProfileProperty> getProperties() {
+		return this.properties;
+	}
+	
 }

src/main/java/ch/spacebase/mc/auth/response/MinecraftTexturesPayload.java

@@ -0,0 +1,30 @@
+package ch.spacebase.mc.auth.response;
+
+import java.util.Map;
+
+import ch.spacebase.mc.auth.ProfileTexture;
+
+public class MinecraftTexturesPayload {
+
+	private long timestamp;
+	private String profileId;
+	private String profileName;
+	private Map<String, ProfileTexture> textures;
+
+	public long getTimestamp() {
+		return this.timestamp;
+	}
+
+	public String getProfileId() {
+		return this.profileId;
+	}
+
+	public String getProfileName() {
+		return this.profileName;
+	}
+
+	public Map<String, ProfileTexture> getTextures() {
+		return this.textures;
+	}
+	
+}

src/main/java/ch/spacebase/mc/protocol/MinecraftProtocol.java

@@ -33,6 +33,8 @@ import ch.spacebase.mc.protocol.packet.ingame.client.window.ClientEnchantItemPac
 import ch.spacebase.mc.protocol.packet.ingame.client.window.ClientWindowActionPacket;
 import ch.spacebase.mc.protocol.packet.ingame.client.world.ClientUpdateSignPacket;
 import ch.spacebase.mc.protocol.packet.ingame.server.ServerChatPacket;
+import ch.spacebase.mc.protocol.packet.ingame.server.ServerCombatPacket;
+import ch.spacebase.mc.protocol.packet.ingame.server.ServerDifficultyPacket;
 import ch.spacebase.mc.protocol.packet.ingame.server.ServerDisconnectPacket;
 import ch.spacebase.mc.protocol.packet.ingame.server.ServerJoinGamePacket;
 import ch.spacebase.mc.protocol.packet.ingame.server.ServerKeepAlivePacket;
@@ -326,6 +328,8 @@ public class MinecraftProtocol extends PacketProtocol {
 		this.registerIncoming(62, ServerTeamPacket.class);
 		this.registerIncoming(63, ServerPluginMessagePacket.class);
 		this.registerIncoming(64, ServerDisconnectPacket.class);
+		this.registerIncoming(65, ServerDifficultyPacket.class);
+		this.registerIncoming(66, ServerCombatPacket.class);
 		
 		this.registerOutgoing(0, ClientKeepAlivePacket.class);
 		this.registerOutgoing(1, ClientChatPacket.class);
@@ -444,6 +448,8 @@ public class MinecraftProtocol extends PacketProtocol {
 		this.registerOutgoing(62, ServerTeamPacket.class);
 		this.registerOutgoing(63, ServerPluginMessagePacket.class);
 		this.registerOutgoing(64, ServerDisconnectPacket.class);
+		this.registerOutgoing(65, ServerDifficultyPacket.class);
+		this.registerOutgoing(66, ServerCombatPacket.class);
 	}
 	
 	private void initClientStatus(Session session) {

src/main/java/ch/spacebase/mc/protocol/ProtocolConstants.java

@@ -3,8 +3,8 @@ package ch.spacebase.mc.protocol;
 public class ProtocolConstants {
 
 	// General Constants
-	public static final String GAME_VERSION = "14w03b";
-	public static final int PROTOCOL_VERSION = 6;
+	public static final String GAME_VERSION = "14w04b";
+	public static final int PROTOCOL_VERSION = 8;
 	
 	// General Key Constants
 	public static final String PROFILE_KEY = "profile";

src/main/java/ch/spacebase/mc/protocol/packet/ingame/client/ClientKeepAlivePacket.java

@@ -24,12 +24,12 @@ public class ClientKeepAlivePacket implements Packet {
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.id = in.readInt();
+		this.id = in.readVarInt();
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
-		out.writeInt(this.id);
+		out.writeVarInt(this.id);
 	}
 	
 	@Override

src/main/java/ch/spacebase/mc/protocol/packet/ingame/client/ClientRequestPacket.java

@@ -24,7 +24,7 @@ public class ClientRequestPacket implements Packet {
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.request = Request.values()[in.readByte()];
+		this.request = Request.values()[in.readUnsignedByte()];
 	}
 
 	@Override

src/main/java/ch/spacebase/mc/protocol/packet/ingame/client/entity/ClientAnimationPacket.java

@@ -8,45 +8,20 @@ import ch.spacebase.packetlib.packet.Packet;
 
 public class ClientAnimationPacket implements Packet {
 	
-	private int entityId;
-	private Animation animation;
-	
-	@SuppressWarnings("unused")
-	private ClientAnimationPacket() {
-	}
-	
-	public ClientAnimationPacket(int entityId, Animation animation) {
-		this.entityId = entityId;
-		this.animation = animation;
-	}
-	
-	public int getEntityId() {
-		return this.entityId;
-	}
-	
-	public Animation getAnimation() {
-		return this.animation;
+	public ClientAnimationPacket() {
 	}
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.entityId = in.readInt();
-		this.animation = Animation.values()[in.readByte() - 1];
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
-		out.writeInt(this.entityId);
-		out.writeByte(this.animation.ordinal() + 1);
 	}
 	
 	@Override
 	public boolean isPriority() {
 		return false;
 	}
-	
-	public static enum Animation {
-		SWING_ARM;
-	}
 
 }

src/main/java/ch/spacebase/mc/protocol/packet/ingame/client/entity/ClientEntityActionPacket.java

@@ -40,16 +40,16 @@ public class ClientEntityActionPacket implements Packet {
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.entityId = in.readInt();
-		this.action = Action.values()[in.readByte() - 1];
-		this.jumpBoost = in.readInt();
+		this.entityId = in.readVarInt();
+		this.action = Action.values()[in.readUnsignedByte() - 1];
+		this.jumpBoost = in.readVarInt();
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
-		out.writeInt(this.entityId);
+		out.writeVarInt(this.entityId);
 		out.writeByte(this.action.ordinal() + 1);
-		out.writeInt(this.jumpBoost);
+		out.writeVarInt(this.jumpBoost);
 	}
 	
 	@Override

src/main/java/ch/spacebase/mc/protocol/packet/ingame/client/entity/ClientEntityInteractPacket.java

@@ -30,13 +30,13 @@ public class ClientEntityInteractPacket implements Packet {
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.entityId = in.readInt();
-		this.action = Action.values()[in.readByte()];
+		this.entityId = in.readVarInt();
+		this.action = Action.values()[in.readUnsignedByte()];
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
-		out.writeInt(this.entityId);
+		out.writeVarInt(this.entityId);
 		out.writeByte(this.action.ordinal());
 	}
 	

src/main/java/ch/spacebase/mc/protocol/packet/ingame/client/entity/player/ClientSteerVehiclePacket.java

@@ -44,16 +44,25 @@ public class ClientSteerVehiclePacket implements Packet {
 	public void read(NetInput in) throws IOException {
 		this.sideways = in.readFloat();
 		this.forward = in.readFloat();
-		this.jump = in.readBoolean();
-		this.dismount = in.readBoolean();
+		int flags = in.readUnsignedByte();
+		this.jump = (flags & 1) > 0;
+		this.dismount = (flags & 2) > 0;
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
 		out.writeFloat(this.sideways);
 		out.writeFloat(this.forward);
-		out.writeBoolean(this.jump);
-		out.writeBoolean(this.dismount);
+		byte flags = 0;
+		if(this.jump) {
+			flags = (byte) (flags | 1);
+		}
+
+		if(this.dismount) {
+			flags = (byte) (flags | 2);
+		}
+
+		out.writeByte(flags);
 	}
 	
 	@Override

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/ServerCombatPacket.java

@@ -0,0 +1,91 @@
+package ch.spacebase.mc.protocol.packet.ingame.server;
+
+import java.io.IOException;
+
+import ch.spacebase.packetlib.io.NetInput;
+import ch.spacebase.packetlib.io.NetOutput;
+import ch.spacebase.packetlib.packet.Packet;
+
+public class ServerCombatPacket implements Packet {
+	
+	private CombatState state;
+	private int entityId;
+	private int duration;
+	private int playerId;
+	private String message;
+	
+	public ServerCombatPacket() {
+		this.state = CombatState.ENTER_COMBAT;
+	}
+	
+	public ServerCombatPacket(int entityId, int duration) {
+		this.state = CombatState.END_COMBAT;
+		this.entityId = entityId;
+		this.duration = duration;
+	}
+	
+	public ServerCombatPacket(int entityId, int playerId, String message) {
+		this.state = CombatState.ENTITY_DEAD;
+		this.entityId = entityId;
+		this.playerId = playerId;
+		this.message = message;
+	}
+	
+	public CombatState getCombatState() {
+		return this.state;
+	}
+	
+	public int getEntityId() {
+		return this.entityId;
+	}
+	
+	public int getDuration() {
+		return this.duration;
+	}
+	
+	public int getPlayerId() {
+		return this.playerId;
+	}
+	
+	public String getMessage() {
+		return this.message;
+	}
+
+	@Override
+	public void read(NetInput in) throws IOException {
+        this.state = CombatState.values()[in.readUnsignedByte()];
+        if(this.state == CombatState.END_COMBAT) {
+        	this.duration = in.readVarInt();
+        	this.entityId = in.readInt();
+        } else if(this.state == CombatState.ENTITY_DEAD) {
+        	this.playerId = in.readVarInt();
+        	this.entityId = in.readInt();
+        	this.message = in.readString();
+        }
+	}
+
+	@Override
+	public void write(NetOutput out) throws IOException {
+		out.writeByte(this.state.ordinal());
+        if(this.state == CombatState.END_COMBAT) {
+        	out.writeVarInt(this.duration);
+        	out.writeInt(this.entityId);
+        } else if(this.state == CombatState.ENTITY_DEAD) {
+        	out.writeVarInt(this.playerId);
+        	out.writeInt(this.entityId);
+        	out.writeString(this.message);
+        }
+	}
+	
+	@Override
+	public boolean isPriority() {
+		return false;
+	}
+
+	public static enum CombatState {
+		ENTER_COMBAT,
+		END_COMBAT,
+		ENTITY_DEAD;
+	}
+
+}

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/ServerPlayerListEntryPacket.java

@@ -38,14 +38,14 @@ public class ServerPlayerListEntryPacket implements Packet {
 	public void read(NetInput in) throws IOException {
 		this.name = in.readString();
 		this.online = in.readBoolean();
-		this.ping = in.readShort();
+		this.ping = in.readVarInt();
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
 		out.writeString(this.name);
 		out.writeBoolean(this.online);
-		out.writeShort(this.ping);
+		out.writeVarInt(this.ping);
 	}
 	
 	@Override

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/entity/ServerCollectItemPacket.java

@@ -30,14 +30,14 @@ public class ServerCollectItemPacket implements Packet {
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.collectedEntityId = in.readInt();
-		this.collectorEntityId = in.readInt();
+		this.collectedEntityId = in.readVarInt();
+		this.collectorEntityId = in.readVarInt();
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
-		out.writeInt(this.collectedEntityId);
-		out.writeInt(this.collectorEntityId);
+		out.writeVarInt(this.collectedEntityId);
+		out.writeVarInt(this.collectorEntityId);
 	}
 	
 	@Override

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/entity/ServerDestroyEntitiesPacket.java

@@ -24,17 +24,17 @@ public class ServerDestroyEntitiesPacket implements Packet {
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.entityIds = new int[in.readByte()];
+		this.entityIds = new int[in.readVarInt()];
 		for(int index = 0; index < this.entityIds.length; index++) {
-			this.entityIds[index] = in.readInt();
+			this.entityIds[index] = in.readVarInt();
 		}
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
-		out.writeByte(this.entityIds.length);
+		out.writeVarInt(this.entityIds.length);
 		for(int entityId : this.entityIds) {
-			out.writeInt(entityId);
+			out.writeVarInt(entityId);
 		}
 	}
 	

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/entity/ServerEntityEffectPacket.java

@@ -42,18 +42,18 @@ public class ServerEntityEffectPacket implements Packet {
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.entityId = in.readInt();
+		this.entityId = in.readVarInt();
 		this.effect = Effect.values()[in.readByte()];
 		this.amplifier = in.readByte();
-		this.duration = in.readShort();
+		this.duration = in.readVarInt();
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
-		out.writeInt(this.entityId);
+		out.writeVarInt(this.entityId);
 		out.writeByte(this.effect.ordinal());
 		out.writeByte(this.amplifier);
-		out.writeShort(this.duration);
+		out.writeVarInt(this.duration);
 	}
 	
 	@Override

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/entity/ServerEntityEquipmentPacket.java

@@ -38,14 +38,14 @@ public class ServerEntityEquipmentPacket implements Packet {
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.entityId = in.readInt();
+		this.entityId = in.readVarInt();
 		this.slot = in.readShort();
 		this.item = NetUtil.readItem(in);
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
-		out.writeInt(this.entityId);
+		out.writeVarInt(this.entityId);
 		out.writeShort(this.slot);
 		NetUtil.writeItem(out, this.item);
 	}

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/entity/ServerEntityHeadLookPacket.java

@@ -26,13 +26,13 @@ public class ServerEntityHeadLookPacket implements Packet {
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.entityId = in.readInt();
+		this.entityId = in.readVarInt();
 		this.headYaw = in.readByte() * 360 / 256f;
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
-		out.writeInt(this.entityId);
+		out.writeVarInt(this.entityId);
 		out.writeByte((byte) (this.headYaw * 256 / 360));
 	}
 	

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/entity/ServerEntityMetadataPacket.java

@@ -32,13 +32,13 @@ public class ServerEntityMetadataPacket implements Packet {
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.entityId = in.readInt();
+		this.entityId = in.readVarInt();
 		this.metadata = NetUtil.readEntityMetadata(in);
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
-		out.writeInt(this.entityId);
+		out.writeVarInt(this.entityId);
 		NetUtil.writeEntityMetadata(out, this.metadata);
 	}
 	

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/entity/ServerEntityMovementPacket.java

@@ -51,7 +51,7 @@ public class ServerEntityMovementPacket implements Packet {
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.entityId = in.readInt();
+		this.entityId = in.readVarInt();
 		if(this.pos) {
 			this.moveX = in.readByte() / 32D;
 			this.moveY = in.readByte() / 32D;
@@ -66,7 +66,7 @@ public class ServerEntityMovementPacket implements Packet {
 
 	@Override
 	public void write(NetOutput out) throws IOException {
-		out.writeInt(this.entityId);
+		out.writeVarInt(this.entityId);
 		if(this.pos) {
 			out.writeByte((int) (this.moveX * 32));
 			out.writeByte((int) (this.moveY * 32));

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/entity/ServerEntityPropertiesPacket.java

@@ -35,9 +35,9 @@ public class ServerEntityPropertiesPacket implements Packet {
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.entityId = in.readInt();
+		this.entityId = in.readVarInt();
 		this.attributes = new ArrayList<Attribute>();
-		int length = in.readInt();
+		int length = in.readVarInt();
 		for(int index = 0; index < length; index++) {
 			String key = in.readString();
 			double value = in.readDouble();
@@ -53,8 +53,8 @@ public class ServerEntityPropertiesPacket implements Packet {
 
 	@Override
 	public void write(NetOutput out) throws IOException {
-		out.writeInt(this.entityId);
-		out.writeInt(this.attributes.size());
+		out.writeVarInt(this.entityId);
+		out.writeVarInt(this.attributes.size());
 		for(Attribute attribute : this.attributes) {
 			out.writeString(attribute.getKey());
 			out.writeDouble(attribute.getValue());

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/entity/ServerEntityRemoveEffectPacket.java

@@ -10,18 +10,14 @@ public class ServerEntityRemoveEffectPacket implements Packet {
 	
 	private int entityId;
 	private Effect effect;
-	private int amplifier;
-	private int duration;
 	
 	@SuppressWarnings("unused")
 	private ServerEntityRemoveEffectPacket() {
 	}
 	
-	public ServerEntityRemoveEffectPacket(int entityId, Effect effect, int amplifier, int duration) {
+	public ServerEntityRemoveEffectPacket(int entityId, Effect effect) {
 		this.entityId = entityId;
 		this.effect = effect;
-		this.amplifier = amplifier;
-		this.duration = duration;
 	}
 	
 	public int getEntityId() {
@@ -31,29 +27,17 @@ public class ServerEntityRemoveEffectPacket implements Packet {
 	public Effect getEffect() {
 		return this.effect;
 	}
-	
-	public int getAmplifier() {
-		return this.amplifier;
-	}
-	
-	public int getDuration() {
-		return this.duration;
-	}
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.entityId = in.readInt();
+		this.entityId = in.readVarInt();
 		this.effect = Effect.values()[in.readByte()];
-		this.amplifier = in.readByte();
-		this.duration = in.readShort();
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
-		out.writeInt(this.entityId);
+		out.writeVarInt(this.entityId);
 		out.writeByte(this.effect.ordinal());
-		out.writeByte(this.amplifier);
-		out.writeShort(this.duration);
 	}
 	
 	@Override

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/entity/ServerEntityTeleportPacket.java

@@ -54,7 +54,7 @@ public class ServerEntityTeleportPacket implements Packet {
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.entityId = in.readInt();
+		this.entityId = in.readVarInt();
 		this.x = in.readInt() / 32D;
 		this.y = in.readInt() / 32D;
 		this.z = in.readInt() / 32D;
@@ -64,7 +64,7 @@ public class ServerEntityTeleportPacket implements Packet {
 
 	@Override
 	public void write(NetOutput out) throws IOException {
-		out.writeInt(this.entityId);
+		out.writeVarInt(this.entityId);
 		out.writeInt((int) (this.x * 32));
 		out.writeInt((int) (this.y * 32));
 		out.writeInt((int) (this.z * 32));

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/entity/ServerEntityVelocityPacket.java

@@ -42,7 +42,7 @@ public class ServerEntityVelocityPacket implements Packet {
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.entityId = in.readInt();
+		this.entityId = in.readVarInt();
 		this.motX = in.readShort() / 8000D;
 		this.motY = in.readShort() / 8000D;
 		this.motZ = in.readShort() / 8000D;
@@ -50,7 +50,7 @@ public class ServerEntityVelocityPacket implements Packet {
 
 	@Override
 	public void write(NetOutput out) throws IOException {
-		out.writeInt(this.entityId);
+		out.writeVarInt(this.entityId);
 		out.writeShort((int) (this.motX * 8000));
 		out.writeShort((int) (this.motY * 8000));
 		out.writeShort((int) (this.motZ * 8000));

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/entity/player/ServerPlayerUseBedPacket.java

@@ -32,13 +32,13 @@ public class ServerPlayerUseBedPacket implements Packet {
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.entityId = in.readInt();
+		this.entityId = in.readVarInt();
 		this.position = NetUtil.readPosition(in);
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
-		out.writeInt(this.entityId);
+		out.writeVarInt(this.entityId);
 		NetUtil.writePosition(out, this.position);
 	}
 	

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/entity/player/ServerSetExperiencePacket.java

@@ -37,15 +37,15 @@ public class ServerSetExperiencePacket implements Packet {
 	@Override
 	public void read(NetInput in) throws IOException {
 		this.experience = in.readFloat();
-		this.level = in.readShort();
-		this.totalExperience = in.readShort();
+		this.level = in.readVarInt();
+		this.totalExperience = in.readVarInt();
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
 		out.writeFloat(this.experience);
-		out.writeShort(this.level);
-		out.writeShort(this.totalExperience);
+		out.writeVarInt(this.level);
+		out.writeVarInt(this.totalExperience);
 	}
 	
 	@Override

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/entity/player/ServerUpdateHealthPacket.java

@@ -37,14 +37,14 @@ public class ServerUpdateHealthPacket implements Packet {
 	@Override
 	public void read(NetInput in) throws IOException {
 		this.health = in.readFloat();
-		this.food = in.readShort();
+		this.food = in.readVarInt();
 		this.saturation = in.readFloat();
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
 		out.writeFloat(this.health);
-		out.writeShort(this.food);
+		out.writeVarInt(this.food);
 		out.writeFloat(this.saturation);
 	}
 	

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/entity/spawn/ServerSpawnPaintingPacket.java

@@ -2,6 +2,8 @@ package ch.spacebase.mc.protocol.packet.ingame.server.entity.spawn;
 
 import java.io.IOException;
 
+import ch.spacebase.mc.protocol.data.game.Position;
+import ch.spacebase.mc.util.NetUtil;
 import ch.spacebase.packetlib.io.NetInput;
 import ch.spacebase.packetlib.io.NetOutput;
 import ch.spacebase.packetlib.packet.Packet;
@@ -10,21 +12,17 @@ public class ServerSpawnPaintingPacket implements Packet {
 	
 	private int entityId;
 	private Art art;
-	private int x;
-	private int y;
-	private int z;
+	private Position position;
 	private Direction direction;
 	
 	@SuppressWarnings("unused")
 	private ServerSpawnPaintingPacket() {
 	}
 	
-	public ServerSpawnPaintingPacket(int entityId, Art art, int x, int y, int z, Direction direction) {
+	public ServerSpawnPaintingPacket(int entityId, Art art, Position position, Direction direction) {
 		this.entityId = entityId;
 		this.art = art;
-		this.x = x;
-		this.y = y;
-		this.z = z;
+		this.position = position;
 		this.direction = direction;
 	}
 	
@@ -36,16 +34,8 @@ public class ServerSpawnPaintingPacket implements Packet {
 		return this.art;
 	}
 	
-	public int getX() {
-		return this.x;
-	}
-	
-	public int getY() {
-		return this.y;
-	}
-	
-	public int getZ() {
-		return this.z;
+	public Position getPosition() {
+		return this.position;
 	}
 	
 	public Direction getDirection() {
@@ -56,20 +46,16 @@ public class ServerSpawnPaintingPacket implements Packet {
 	public void read(NetInput in) throws IOException {
 		this.entityId = in.readVarInt();
 		this.art = Art.valueOf(in.readString());
-		this.x = in.readInt();
-		this.y = in.readInt();
-		this.z = in.readInt();
-		this.direction = Direction.values()[in.readInt()];
+		this.position = NetUtil.readPosition(in);
+		this.direction = Direction.values()[in.readUnsignedByte()];
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
 		out.writeVarInt(this.entityId);
 		out.writeString(this.art.name());
-		out.writeInt(this.x);
-		out.writeInt(this.y);
-		out.writeInt(this.z);
-		out.writeInt(this.direction.ordinal());
+		NetUtil.writePosition(out, this.position);
+		out.writeByte(this.direction.ordinal());
 	}
 	
 	@Override

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/entity/spawn/ServerSpawnPlayerPacket.java

@@ -2,6 +2,8 @@ package ch.spacebase.mc.protocol.packet.ingame.server.entity.spawn;
 
 import java.io.IOException;
 
+import ch.spacebase.mc.auth.GameProfile;
+import ch.spacebase.mc.auth.ProfileProperty;
 import ch.spacebase.mc.protocol.data.game.EntityMetadata;
 import ch.spacebase.mc.util.NetUtil;
 import ch.spacebase.packetlib.io.NetInput;
@@ -11,8 +13,7 @@ import ch.spacebase.packetlib.packet.Packet;
 public class ServerSpawnPlayerPacket implements Packet {
 	
 	private int entityId;
-	private String uuid;
-	private String name;
+	private GameProfile profile;
 	private double x;
 	private double y;
 	private double z;
@@ -25,10 +26,9 @@ public class ServerSpawnPlayerPacket implements Packet {
 	private ServerSpawnPlayerPacket() {
 	}
 	
-	public ServerSpawnPlayerPacket(int entityId, String uuid, String name, double x, double y, double z, float yaw, float pitch, int currentItem, EntityMetadata metadata[]) {
+	public ServerSpawnPlayerPacket(int entityId, GameProfile profile, double x, double y, double z, float yaw, float pitch, int currentItem, EntityMetadata metadata[]) {
 		this.entityId = entityId;
-		this.uuid = uuid;
-		this.name = name;
+		this.profile = profile;
 		this.x = x;
 		this.y = y;
 		this.z = z;
@@ -42,12 +42,8 @@ public class ServerSpawnPlayerPacket implements Packet {
 		return this.entityId;
 	}
 	
-	public String getUUID() {
-		return this.uuid;
-	}
-	
-	public String getName() {
-		return this.name;
+	public GameProfile getProfile() {
+		return this.profile;
 	}
 	
 	public double getX() {
@@ -81,8 +77,14 @@ public class ServerSpawnPlayerPacket implements Packet {
 	@Override
 	public void read(NetInput in) throws IOException {
 		this.entityId = in.readVarInt();
-		this.uuid = in.readString();
-		this.name = in.readString();
+		this.profile = new GameProfile(in.readString(), in.readString());
+		for(int count = 0; count < in.readVarInt(); count++) {
+			String name = in.readString();
+			String value = in.readString();
+			String signature = in.readString();
+			this.profile.getProperties().put(name, new ProfileProperty(name, value, signature));
+		}
+		
 		this.x = in.readInt() / 32D;
 		this.y = in.readInt() / 32D;
 		this.z = in.readInt() / 32D;
@@ -95,8 +97,15 @@ public class ServerSpawnPlayerPacket implements Packet {
 	@Override
 	public void write(NetOutput out) throws IOException {
 		out.writeVarInt(this.entityId);
-		out.writeString(this.uuid);
-		out.writeString(this.name);
+		out.writeString(this.profile.getId());
+		out.writeString(this.profile.getName());
+		out.writeVarInt(this.profile.getProperties().size());
+		for(ProfileProperty property : this.profile.getProperties().values()) {
+			out.writeString(property.getName());
+			out.writeString(property.getValue());
+			out.writeString(property.getSignature());
+		}
+		
 		out.writeInt((int) (this.x * 32));
 		out.writeInt((int) (this.y * 32));
 		out.writeInt((int) (this.z * 32));

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/scoreboard/ServerScoreboardObjectivePacket.java

@@ -9,16 +9,16 @@ import ch.spacebase.packetlib.packet.Packet;
 public class ServerScoreboardObjectivePacket implements Packet {
 	
 	private String name;
-	private String value;
+	private String displayName;
 	private Action action;
 	
 	@SuppressWarnings("unused")
 	private ServerScoreboardObjectivePacket() {
 	}
 	
-	public ServerScoreboardObjectivePacket(String name, String value, Action action) {
+	public ServerScoreboardObjectivePacket(String name, String displayName, Action action) {
 		this.name = name;
-		this.value = value;
+		this.displayName = displayName;
 		this.action = action;
 	}
 	
@@ -26,8 +26,8 @@ public class ServerScoreboardObjectivePacket implements Packet {
 		return this.name;
 	}
 	
-	public String getValue() {
-		return this.value;
+	public String getDisplayName() {
+		return this.displayName;
 	}
 	
 	public Action getAction() {
@@ -37,14 +37,14 @@ public class ServerScoreboardObjectivePacket implements Packet {
 	@Override
 	public void read(NetInput in) throws IOException {
 		this.name = in.readString();
-		this.value = in.readString();
+		this.displayName = in.readString();
 		this.action = Action.values()[in.readByte()];
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
 		out.writeString(this.name);
-		out.writeString(this.value);
+		out.writeString(this.displayName);
 		out.writeByte(this.action.ordinal());
 	}
 	

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/scoreboard/ServerTeamPacket.java

@@ -95,7 +95,7 @@ public class ServerTeamPacket implements Packet {
 		}
 		
 		if(this.action == Action.CREATE || this.action == Action.ADD_PLAYER || this.action == Action.REMOVE_PLAYER) {
-			this.players = new String[in.readShort()];
+			this.players = new String[in.readVarInt()];
 			for(int index = 0; index < this.players.length; index++) {
 				this.players[index] = in.readString();
 			}
@@ -114,7 +114,7 @@ public class ServerTeamPacket implements Packet {
 		}
 		
 		if(this.action == Action.CREATE || this.action == Action.ADD_PLAYER || this.action == Action.REMOVE_PLAYER) {
-			out.writeShort(this.players.length);
+			out.writeVarInt(this.players.length);
 			for(String player : this.players) {
 				out.writeString(player);
 			}

src/main/java/ch/spacebase/mc/protocol/packet/ingame/server/scoreboard/ServerUpdateScorePacket.java

@@ -8,60 +8,60 @@ import ch.spacebase.packetlib.packet.Packet;
 
 public class ServerUpdateScorePacket implements Packet {
 	
-	private String name;
+	private String entry;
 	private Action action;
-	private String scoreName;
-	private int scoreValue;
+	private String objective;
+	private int value;
 	
 	@SuppressWarnings("unused")
 	private ServerUpdateScorePacket() {
 	}
 	
-	public ServerUpdateScorePacket(String name) {
-		this.name = name;
+	public ServerUpdateScorePacket(String entry) {
+		this.entry = entry;
 		this.action = Action.REMOVE;
 	}
 	
-	public ServerUpdateScorePacket(String name, String scoreName, int scoreValue) {
-		this.name = name;
-		this.scoreName = scoreName;
-		this.scoreValue = scoreValue;
+	public ServerUpdateScorePacket(String entry, String objective, int value) {
+		this.entry = entry;
+		this.objective = objective;
+		this.value = value;
 		this.action = Action.ADD_OR_UPDATE;
 	}
 	
-	public String getScoreboardName() {
-		return this.name;
+	public String getEntry() {
+		return this.entry;
 	}
 	
 	public Action getAction() {
 		return this.action;
 	}
 	
-	public String getScoreName() {
-		return this.scoreName;
+	public String getObjective() {
+		return this.objective;
 	}
 	
-	public int getScoreValue() {
-		return this.scoreValue;
+	public int getValue() {
+		return this.value;
 	}
 
 	@Override
 	public void read(NetInput in) throws IOException {
-		this.name = in.readString();
+		this.entry = in.readString();
 		this.action = Action.values()[in.readByte()];
 		if(this.action == Action.ADD_OR_UPDATE) {
-			this.scoreName = in.readString();
-			this.scoreValue = in.readInt();
+			this.objective = in.readString();
+			this.value = in.readVarInt();
 		}
 	}
 
 	@Override
 	public void write(NetOutput out) throws IOException {
-		out.writeString(this.name);
+		out.writeString(this.entry);
 		out.writeByte(this.action.ordinal());
 		if(this.action == Action.ADD_OR_UPDATE) {
-			out.writeString(this.scoreName);
-			out.writeInt(this.scoreValue);
+			out.writeString(this.objective);
+			out.writeVarInt(this.value);
 		}
 	}
 	

src/main/java/ch/spacebase/mc/util/IOUtils.java

@@ -1,5 +1,6 @@
 package ch.spacebase.mc.util;
 
+import java.io.ByteArrayOutputStream;
 import java.io.Closeable;
 import java.io.IOException;
 import java.io.InputStream;
@@ -31,5 +32,18 @@ public class IOUtils {
 		in.close();
 		return writer.toString();
 	}
+	
+	public static byte[] toByteArray(InputStream in) throws IOException {
+		ByteArrayOutputStream out = new ByteArrayOutputStream();
+		byte buffer[] = new byte[DEFAULT_BUFFER_SIZE];
+		int n = 0;
+		while(-1 != (n = in.read(buffer))) {
+			out.write(buffer, 0, n);
+		}
+
+		in.close();
+		out.close();
+		return out.toByteArray();
+	}
 
 }

src/main/java/ch/spacebase/mc/util/NetUtil.java

@@ -22,10 +22,44 @@ import ch.spacebase.packetlib.io.NetOutput;
 
 public class NetUtil {
 
+	private static final int[] EXPONENTS_OF_TWO = new int[] { 0, 1, 28, 2, 29, 14, 24, 3, 30, 22, 20, 15, 25, 17, 4, 8, 31, 27, 13, 23, 21, 19, 16, 7, 26, 12, 18, 6, 11, 5, 10, 9 };
+	
+	private static final int POSITION_X_SIZE = 1 + lastExponentOfTwo(nextPowerOfTwo(30000000));
+	private static final int POSITION_Z_SIZE = POSITION_X_SIZE;
+	private static final int POSITION_Y_SIZE = 64 - POSITION_X_SIZE - POSITION_Z_SIZE;
+	private static final int POSITION_Y_SHIFT = POSITION_Z_SIZE;
+	private static final int POSITION_X_SHIFT = POSITION_Y_SHIFT + POSITION_Y_SIZE;
+	private static final long POSITION_X_MASK = (1L << POSITION_X_SIZE) - 1;
+	private static final long POSITION_Y_MASK = (1L << POSITION_Y_SIZE) - 1;
+	private static final long POSITION_Z_MASK = (1L << POSITION_Z_SIZE) - 1;
+
 	/**
 	 * An unfortunately necessary hack value for chunk data packet checks as to whether a packet contains skylight values or not.
 	 */
 	public static boolean hasSky = true;
+	
+	private static int nextPowerOfTwo(int i) {
+		int minusOne = i - 1;
+		minusOne |= minusOne >> 1;
+		minusOne |= minusOne >> 2;
+		minusOne |= minusOne >> 4;
+		minusOne |= minusOne >> 8;
+		minusOne |= minusOne >> 16;
+		return minusOne + 1;
+	}
+
+	private static boolean isPowerOfTwo(int i) {
+		return i != 0 && (i & i - 1) == 0;
+	}
+
+	private static int nextExponentOfTwo(int i) {
+		int power = isPowerOfTwo(i) ? i : nextPowerOfTwo(i);
+		return EXPONENTS_OF_TWO[(int) (power * 125613361L >> 27) & 31];
+	}
+
+	public static int lastExponentOfTwo(int i) {
+		return nextExponentOfTwo(i) - (isPowerOfTwo(i) ? 0 : 1);
+	}
 
 	public static CompoundTag readNBT(NetInput in) throws IOException {
 		short length = in.readShort();
@@ -50,13 +84,15 @@ public class NetUtil {
 	}
 	
 	public static Position readPosition(NetInput in) throws IOException {
-		return new Position(in.readInt(), in.readUnsignedByte(), in.readInt());
+		long val = in.readLong();
+		int x = (int) (val << 64 - POSITION_X_SHIFT - POSITION_X_SIZE >> 64 - POSITION_X_SIZE);
+		int y = (int) (val << 64 - POSITION_Y_SHIFT - POSITION_Y_SIZE >> 64 - POSITION_Y_SIZE);
+		int z = (int) (val << 64 - POSITION_Z_SIZE >> 64 - POSITION_Z_SIZE);
+		return new Position(x, y, z);
 	}
-	
+
 	public static void writePosition(NetOutput out, Position pos) throws IOException {
-		out.writeInt(pos.getX());
-		out.writeByte(pos.getY());
-		out.writeInt(pos.getZ());
+		out.writeLong((pos.getX() & POSITION_X_MASK) << POSITION_X_SHIFT | (pos.getY() & POSITION_Y_MASK) << POSITION_Y_SHIFT | (pos.getZ() & POSITION_Z_MASK));
 	}
 	
 	public static ItemStack readItem(NetInput in) throws IOException {