UpdateHealthPacket

protocol/src/main/java/mc/protocol/State.java

@@ -51,17 +51,16 @@ public enum State {
 					0x0D, PlayerPositionPacket.class,
 					0x0E, CPlayerPositionAndLookPacket.class,
 					0x0F, PlayerLookPacket.class,
-					0x15, EntityActionPacket.class,
-					0x1C, UpdateSignPacket.class
+					0x15, EntityActionPacket.class
 			),
 			// client bound
 			Map.of(
 					PingPacket.class, 0x1F,
 					ChunkDataPacket.class, 0x20,
 					JoinGamePacket.class, 0x23,
-					OpenSignEditorPacket.class, 0x2A,
 					PlayerAbilitiesPacket.class,0x2C,
 					SPlayerPositionAndLookPacket.class, 0x2F,
+					UpdateHealthPacket.class, 0x41,
 					SpawnPositionPacket.class, 0x46
 			)
 	);

protocol/src/main/java/mc/protocol/packets/client/UpdateSignPacket.java

@@ -1,57 +0,0 @@
-package mc.protocol.packets.client;
-
-import lombok.EqualsAndHashCode;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-import lombok.ToString;
-import mc.protocol.io.NetByteBuf;
-import mc.protocol.model.Location;
-import mc.protocol.packets.ClientSidePacket;
-import mc.protocol.packets.server.OpenSignEditorPacket;
-import mc.protocol.serializer.LocationSerializer;
-
-/**
- * Update Sign packet.
- *
- * <p>Отправляется клиентом, когда нажата кнопка "Done" в окне редактирования таблички.</p>
- *
- * <p>Структура пакета</p>
- * <pre>
- * | FIELD    | TYPE         | NOTES                          |
- * |----------|--------------|--------------------------------|
- * | Location | Location     | Позиция редактируемой табилчки |
- * | Line 1   | String (384) | Строка таблички                |
- * | Line 2   | String (384) | Строка таблички                |
- * | Line 3   | String (384) | Строка таблички                |
- * | Line 4   | String (384) | Строка таблички                |
- * </pre>
- *
- * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Update_Sign" target="_top">Update Sign</a>
- * @see OpenSignEditorPacket
- */
-@NoArgsConstructor
-@Getter
-@EqualsAndHashCode
-@ToString
-public class UpdateSignPacket implements ClientSidePacket {
-
-	private Location location;
-	@SuppressWarnings("MismatchedReadAndWriteOfArray")
-	private String[] lines;
-
-	@Override
-	public void readSelf(NetByteBuf netByteBuf) {
-		this.location = LocationSerializer.fromLongValue(netByteBuf.readLong());
-		this.lines = new String[4];
-		this.lines[0] = netByteBuf.readString(384);
-		this.lines[1] = netByteBuf.readString(384);
-		this.lines[2] = netByteBuf.readString(384);
-		this.lines[3] = netByteBuf.readString(384);
-	}
-
-	@Override
-	public void passivate() {
-		this.location = null;
-		this.lines = null;
-	}
-}

protocol/src/main/java/mc/protocol/packets/server/OpenSignEditorPacket.java

@@ -1,33 +0,0 @@
-package mc.protocol.packets.server;
-
-import lombok.Data;
-import mc.protocol.io.NetByteBuf;
-import mc.protocol.model.Location;
-import mc.protocol.packets.ServerSidePacket;
-import mc.protocol.packets.client.UpdateSignPacket;
-import mc.protocol.serializer.LocationSerializer;
-
-/**
- * Открыть окно редактирования таблички.
- *
- * <p>Структура пакета</p>
- * <pre>
- * | FIELD    | TYPE     | NOTES |
- * |----------|----------|-------|
- * | Location | Location |       |
- * </pre>
- *
- * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Open_Sign_Editor">Open Sign Editor</a>
- * @see UpdateSignPacket
- */
-@Data
-public class OpenSignEditorPacket implements ServerSidePacket {
-
-	private Location location;
-
-	@Override
-	public void writeSelf(NetByteBuf netByteBuf) {
-		long value = LocationSerializer.toLongValue(this.location);
-		netByteBuf.writeLong(value);
-	}
-}

protocol/src/main/java/mc/protocol/packets/server/SpawnPositionPacket.java

@@ -4,7 +4,6 @@ import lombok.Data;
 import mc.protocol.io.NetByteBuf;
 import mc.protocol.model.Location;
 import mc.protocol.packets.ServerSidePacket;
-import mc.protocol.serializer.LocationSerializer;
 
 /**
  * Спавн позиция игрока.
@@ -15,7 +14,7 @@ import mc.protocol.serializer.LocationSerializer;
  * <pre>
  * | FIELD    | TYPE     | NOTES                 |
  * |----------|----------|-----------------------|
- * | Location | Location | Локация спавна игрока |
+ * | Location | Position | Локация спавна игрока |
  * </pre>
  *
  * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Spawn_Position">Spawn Position</a>
@@ -27,7 +26,16 @@ public class SpawnPositionPacket implements ServerSidePacket {
 
 	@Override
 	public void writeSelf(NetByteBuf netByteBuf) {
-		long spawnSerialized = LocationSerializer.toLongValue(this.spawn);
+		long spawnSerialized =
+				((long) (floorDouble(spawn.getX()) & 0x3FFFFFF) << 38)
+				| ((long) (floorDouble(spawn.getY()) & 0xFFF) << 26)
+				| (floorDouble(spawn.getZ()) & 0x3FFFFFF);
 		netByteBuf.writeLong(spawnSerialized);
 	}
+
+	private static int floorDouble(double value) {
+		int i = (int) value;
+		return value < (double) i ? i - 1 : i;
+	}
+
 }

protocol/src/main/java/mc/protocol/packets/server/UpdateHealthPacket.java

@@ -0,0 +1,35 @@
+package mc.protocol.packets.server;
+
+import lombok.Data;
+import mc.protocol.io.NetByteBuf;
+import mc.protocol.packets.ServerSidePacket;
+
+/**
+ * Update Health Packet.
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD           | TYPE   | NOTES                            |
+ * |-----------------|--------|----------------------------------|
+ * | Health          | Float  | 0 = смерть; 20 = полное здоровье |
+ * | Food            | VarInt | 0-20                             |
+ * | Food Saturation | Float  | 0-5                              |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Update_Health">Update Health</a>
+ * @see <a href="https://minecraft.fandom.com/wiki/Food#Hunger_and_saturation">Food: Hunger and saturation</a>
+ */
+@Data
+public class UpdateHealthPacket implements ServerSidePacket {
+
+	private float health;
+	private int food;
+	private float foodSaturation;
+
+	@Override
+	public void writeSelf(NetByteBuf netByteBuf) {
+		netByteBuf.writeFloat(this.health);
+		netByteBuf.writeVarInt(this.food);
+		netByteBuf.writeFloat(this.foodSaturation);
+	}
+}

protocol/src/main/java/mc/protocol/serializer/LocationSerializer.java

@@ -1,26 +0,0 @@
-package mc.protocol.serializer;
-
-import lombok.experimental.UtilityClass;
-import mc.protocol.model.Location;
-
-@UtilityClass
-public class LocationSerializer {
-
-	public long toLongValue(Location location) {
-		return ((long) (floorDouble(location.getX()) & 0x3FFFFFF) << 38)
-				| ((long) (floorDouble(location.getY()) & 0xFFF) << 26)
-				| (floorDouble(location.getZ()) & 0x3FFFFFF);
-	}
-
-	public Location fromLongValue(long value) {
-		return new Location(
-				value >> 38,
-				(value >> 26) & 0xFFF,
-				value << 38 >> 38);
-	}
-
-	private static int floorDouble(double value) {
-		int i = (int) value;
-		return value < (double) i ? i - 1 : i;
-	}
-}

server/src/main/java/mc/server/PacketHandler.java

@@ -26,6 +26,7 @@ import java.util.Base64;
 import java.util.Collections;
 import java.util.Random;
 import java.util.UUID;
+import java.util.concurrent.TimeUnit;
 
 @Slf4j
 @RequiredArgsConstructor
@@ -67,6 +68,7 @@ public class PacketHandler {
 		context.sendNow(response);
 	}
 
+	@SuppressWarnings("java:S2189")
 	public void onLoginStart(ConnectionContext context, LoginStartPacket loginStartPacket) {
 		var loginSuccessPacket = new LoginSuccessPacket();
 		loginSuccessPacket.setUuid(UUID.randomUUID());
@@ -125,10 +127,29 @@ public class PacketHandler {
 
 		// -- Эксперименты -- //
 
-		var openSignEditorPacket = new OpenSignEditorPacket();
-		openSignEditorPacket.setLocation(spawnLocation);
+		var updateHealthPacket = new UpdateHealthPacket();
+		updateHealthPacket.setHealth(0.1f);
+		updateHealthPacket.setFood(0);
+		updateHealthPacket.setFoodSaturation(5.0f);
 
-		context.sendNow(openSignEditorPacket);
+		context.sendNow(updateHealthPacket);
+
+		while (true) {
+			context.sendNow(updateHealthPacket);
+
+			updateHealthPacket.setHealth(updateHealthPacket.getHealth() + 1.0f);
+			updateHealthPacket.setFood(updateHealthPacket.getFood() + 1);
+			if (updateHealthPacket.getHealth() > 20.0f) {
+				updateHealthPacket.setHealth(0.1f);
+				updateHealthPacket.setFood(0);
+			}
+
+			try {
+				TimeUnit.MILLISECONDS.sleep(50);
+			} catch (InterruptedException e) {
+				break;
+			}
+		}
 	}
 
 	private static String faviconToBase64(Path iconPath) {