UpdateSignPacket

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

@@ -51,13 +51,15 @@ public enum State {
 					0x0D, PlayerPositionPacket.class,
 					0x0E, CPlayerPositionAndLookPacket.class,
 					0x0F, PlayerLookPacket.class,
-					0x15, EntityActionPacket.class
+					0x15, EntityActionPacket.class,
+					0x1C, UpdateSignPacket.class
 			),
 			// client bound
 			Map.of(
 					PingPacket.class, 0x1F,
 					ChunkDataPacket.class, 0x20,
 					JoinGamePacket.class, 0x23,
+					OpenSignEditorPacket.class, 0x2A,
 					PlayerAbilitiesPacket.class,0x2C,
 					SPlayerPositionAndLookPacket.class, 0x2F,
 					SpawnPositionPacket.class, 0x46

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

@@ -0,0 +1,57 @@
+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

@@ -0,0 +1,33 @@
+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

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

@@ -0,0 +1,26 @@
+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

@@ -122,6 +122,13 @@ public class PacketHandler {
 		context.send(pingPacket);
 
 		context.flushSending();
+
+		// -- Эксперименты -- //
+
+		var openSignEditorPacket = new OpenSignEditorPacket();
+		openSignEditorPacket.setLocation(spawnLocation);
+
+		context.sendNow(openSignEditorPacket);
 	}
 
 	private static String faviconToBase64(Path iconPath) {