refactoring: swap modules

2021-06-17 15:09:29 +03:00
parent e7f7b9654e
commit 696d18cf41
87 changed files with 3 additions and 5 deletions
--- a/protocol/build.gradle
+++ b/protocol/build.gradle
@@ -0,0 +1,11 @@
+apply from: rootDir.toPath().resolve('logic.gradle').toFile()
+
+dependencies {
+    api project(':utils')
+
+    implementation libs.netty.transport
+    implementation libs.netty.codec
+    implementation libs.json
+
+    testImplementation libs.lang3
+}
--- a/protocol/gradle.properties
+++ b/protocol/gradle.properties
@@ -0,0 +1,2 @@
+# suppress inspection "UnusedProperty" for whole file
+module.name=protocol
--- a/protocol/src/main/java/mc/protocol/ProtocolAttributes.java
+++ b/protocol/src/main/java/mc/protocol/ProtocolAttributes.java
@@ -0,0 +1,10 @@
+package mc.protocol;
+
+import io.netty.util.AttributeKey;
+import lombok.experimental.UtilityClass;
+
+@UtilityClass
+public class ProtocolAttributes {
+
+	public static final AttributeKey<State> STATE = AttributeKey.newInstance("STATE");
+}
--- a/protocol/src/main/java/mc/protocol/ProtocolConstant.java
+++ b/protocol/src/main/java/mc/protocol/ProtocolConstant.java
@@ -0,0 +1,10 @@
+package mc.protocol;
+
+import lombok.experimental.UtilityClass;
+
+@UtilityClass
+public class ProtocolConstant {
+
+	public final String PROTOCOL_NAME = "1.12.2";
+	public final int PROTOCOL_NUMBER = 340;
+}
--- a/protocol/src/main/java/mc/protocol/State.java
+++ b/protocol/src/main/java/mc/protocol/State.java
@@ -0,0 +1,102 @@
+package mc.protocol;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import mc.protocol.packets.ClientSidePacket;
+import mc.protocol.packets.KeepAlivePacket;
+import mc.protocol.packets.ServerSidePacket;
+import mc.protocol.packets.handshaking.client.HandshakePacket;
+import mc.protocol.packets.login.client.LoginStartPacket;
+import mc.protocol.packets.login.server.DisconnectPacket;
+import mc.protocol.packets.login.server.LoginSuccessPacket;
+import mc.protocol.packets.play.client.*;
+import mc.protocol.packets.play.server.*;
+import mc.protocol.packets.status.client.StatusServerRequestPacket;
+import mc.protocol.packets.status.server.StatusServerResponse;
+
+import javax.annotation.Nullable;
+import java.util.Collections;
+import java.util.Map;
+
+@RequiredArgsConstructor
+public enum State {
+
+	HANDSHAKING(0,
+			// client side
+			Map.of(0x00, HandshakePacket.class),
+			// server side
+			Collections.emptyMap()
+	),
+
+	STATUS(1,
+			// client side
+			Map.of(
+					0x00, StatusServerRequestPacket.class,
+					0x01, KeepAlivePacket.class
+			),
+			// server side
+			Map.of(
+					StatusServerResponse.class, 0x00,
+					KeepAlivePacket.class, 0x01
+			)
+	),
+
+	LOGIN(2,
+			// client side
+			Map.of(0x00, LoginStartPacket.class),
+			// server side
+			Map.of(
+					DisconnectPacket.class, 0x00,
+					LoginSuccessPacket.class, 0x02
+			)
+	),
+
+	PLAY(3,
+			// client side
+			Map.of(
+					0x00, TeleportConfirmPacket.class,
+					0x04, ClientSettingsPacket.class,
+					0x09, PluginMessagePacket.class,
+					0x0B, KeepAlivePacket.class,
+					0x0D, PlayerPositionPacket.class,
+					0x0E, CPlayerPositionAndLookPacket.class,
+					0x0F, PlayerLookPacket.class,
+					0x15, EntityActionPacket.class
+			),
+			// server side
+			Map.of(
+					KeepAlivePacket.class, 0x1F,
+					ChunkDataPacket.class, 0x20,
+					JoinGamePacket.class, 0x23,
+					PlayerAbilitiesPacket.class,0x2C,
+					SPlayerPositionAndLookPacket.class, 0x2F,
+					SpawnPositionPacket.class, 0x46
+			)
+	);
+
+	public static State getById(int id) {
+		// а зачем усложнять?
+		//@formatter:off
+		if      (id == 1) return STATUS;
+		else if (id == 2) return LOGIN;
+		else if (id == 3) return PLAY;
+		else              return HANDSHAKING;
+		//@formatter:on
+	}
+
+	@Getter
+	private final int id;
+
+	private final Map<Integer, Class<? extends ClientSidePacket>> clientSidePackets;
+	private final Map<Class<? extends ServerSidePacket>, Integer> serverSidePackets;
+
+	@Nullable
+	public Class<? extends ClientSidePacket> getClientSidePacketById(int id) {
+		return clientSidePackets == null ? null : clientSidePackets.get(id);
+	}
+
+	@Nullable
+	public Integer getServerSidePacketId(Class<? extends ServerSidePacket> clazz) {
+		return serverSidePackets == null ? null : serverSidePackets.get(clazz);
+	}
+}
--- a/protocol/src/main/java/mc/protocol/buffer/NetByteBuf.java
+++ b/protocol/src/main/java/mc/protocol/buffer/NetByteBuf.java
@@ -0,0 +1,192 @@
+package mc.protocol.buffer;
+
+import io.netty.buffer.ByteBuf;
+import lombok.EqualsAndHashCode;
+import lombok.RequiredArgsConstructor;
+import lombok.ToString;
+import lombok.experimental.Delegate;
+import lombok.extern.slf4j.Slf4j;
+import mc.protocol.model.text.Text;
+import mc.protocol.model.text.TextSerializer;
+
+import java.nio.charset.StandardCharsets;
+import java.util.UUID;
+
+/**
+ * Компонент чтения и записи данных протокола.
+ *
+ * <p>Data types</p>
+ * <pre>
+ * | TYPE           | SIZE (bytes)          | ENCODING                                            | NOTES                                                                    |
+ * |----------------|-----------------------|-----------------------------------------------------|--------------------------------------------------------------------------|
+ * | Boolean        | 1                     | True или False                                      | True = 0x01; False = 0x00                                                |
+ * | Byte           | 1                     | Число от -128 до 127                                | 8-bit число со знаком                                                    |
+ * | Unsigned Byte  | 1                     | Число от 0 до 255                                   | 8-bit без знаковое число                                                 |
+ * | Short          | 2                     | Число от -32768 до 32767                            | 16-bit число со знаком                                                   |
+ * | Unsigned Short | 2                     | Число от -32768 до 32767                            | 16-bit без знаковое число                                                |
+ * | Int            | 4                     | Число от -2147483648 и 2147483647                   | 32-bit число со знаком                                                   |
+ * | Long           | 8                     | Число от -9223372036854775808 и 9223372036854775807 | 64-bit число со знаком                                                   |
+ * | Float          | 4                     | 32-bit число одинарной точности (IEEE 754-2008)     | [1]                                                                      |
+ * | Double         | 8                     | 64-bit число одинарной точности (IEEE 754-2008)     | [2]                                                                      |
+ * | String (n)     | >= 1 ; <= (n * 4) + 3 | Последовательность Unicode scalar values            | В начале пишется длина строки в VarInt, после чего записываются символы. |
+ * |                |                       |                                                     | Каждый символ может состоять максимум из 4 байт. [3]                     |
+ * |                |                       |                                                     | Максимальная длина строки - 32767 (3 - это как раз размер VarInt для     |
+ * |                |                       |                                                     | этого числа).                                                            |
+ * | VarInt         | >= 1 ; <= 5           | Число от -2147483648 и 2147483647                   | 32-bit число с плавающей размерностью от 1 до 5 байт                     |
+ * | VarLong        | >= 1 ; <= 10          | Число от -9223372036854775808 и 9223372036854775807 | 64-bit число с плавающей размерностью от 1 до 10 байт                    |
+ * | Text           |                       | JSON                                                | По файту является String (n), который имеет формат JSON                  |
+ *
+ * [1] - <a href="https://en.wikipedia.org/wiki/Single-precision_floating-point_format">Single-precision floating-point format</a>
+ * [2] - <a href="https://en.wikipedia.org/wiki/Double-precision_floating-point_format">Double-precision floating-point format</a>
+ * [3] - <a href="http://unicode.org/glossary/#unicode_scalar_value">Unicode Scalar Value</a>
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Data_types&oldid=14345#Definitions">Data types</a>
+ * @see <a href="https://wiki.vg/index.php?title=Chat&oldid=14272">Chat</a>
+ */
+@Slf4j
+@RequiredArgsConstructor
+@EqualsAndHashCode(callSuper = false)
+@ToString
+public class NetByteBuf extends ByteBuf {
+
+	@Delegate
+	private final ByteBuf byteBuf;
+
+	public void writeUnsignedByte(int value) {
+		byteBuf.writeByte((byte)(value & 0xFF));
+	}
+
+	public void writeText(Text text) {
+		writeString(TextSerializer.toStringPlain(text));
+	}
+
+	//region String
+	public String readString() {
+		return readString(Short.MAX_VALUE);
+	}
+
+	@SuppressWarnings("java:S131")
+	public String readString(int maxLength) {
+		int length = readVarInt();
+
+		if (length == 0) {
+			return "";
+		} else if (length > maxLength) {
+			throw new NetIOException("String length exceeds maximum length: " + length + " > " + maxLength);
+		} else if (length < 0) {
+			throw new NetIOException("String length less zero!");
+		}
+
+		byte[] bytes = new byte[length * 4];
+		int readbleBytes = 0;
+		for (int i = 0; i < length && readableBytes() > 0; i++) {
+			byte b = readByte();
+			bytes[readbleBytes++] = b;
+
+			switch ((b & 0xFF) >> 4) {
+				case 0b1100:
+				case 0b1101:
+					bytes[readbleBytes++] = readByte();
+					break;
+				case 0b1110:
+					bytes[readbleBytes++] = readByte();
+					bytes[readbleBytes++] = readByte();
+					break;
+				case 0b1111:
+					bytes[readbleBytes++] = readByte();
+					bytes[readbleBytes++] = readByte();
+					bytes[readbleBytes++] = readByte();
+					break;
+			}
+		}
+
+		return new String(bytes, 0, readbleBytes, StandardCharsets.UTF_8);
+	}
+
+	public void writeString(String string) {
+		byte[] buf = string.getBytes(StandardCharsets.UTF_8);
+
+		if (buf.length > Short.MAX_VALUE) {
+			log.warn("String is too long: {} > {}", buf.length, Short.MAX_VALUE);
+			writeVarInt(Short.MAX_VALUE);
+			writeBytes(buf, 0, Short.MAX_VALUE);
+		} else {
+			writeVarInt(buf.length);
+			writeBytes(buf);
+		}
+	}
+	//endregion
+
+	//region VarInt
+	public int readVarInt() {
+		int numRead = 0;
+		int result = 0;
+		byte read;
+		do {
+			if ((numRead + 1) > 5) {
+				log.warn("VarInt is too big");
+				break;
+			}
+			read = readByte();
+			int value = (read & 0b01111111);
+			result |= (value << (7 * numRead));
+
+			numRead++;
+		} while ((read & 0b10000000) != 0);
+
+		return result;
+	}
+
+	public void writeVarInt(int value) {
+		while ((value & -128) != 0) {
+			writeByte(value & 127 | 128);
+			value >>>= 7;
+		}
+
+		writeByte(value);
+	}
+	//endregion
+
+	//region VarLong
+	public long readVarLong() {
+		int numRead = 0;
+		long result = 0L;
+		byte read;
+		do {
+			if (numRead > 10) {
+				log.warn("VarLong is too big");
+				break;
+			}
+
+			read = readByte();
+			long value = (read & 0b01111111);
+			result |= (value << (7 * numRead));
+
+			numRead++;
+		} while ((read & 0b10000000) != 0);
+
+		return result;
+	}
+
+	public void writeVarLong(long value) {
+		while ((value & -128L) != 0L) {
+			writeByte((int) (value & 127L) | 128);
+			value >>>= 7;
+		}
+
+		writeByte((int) value);
+	}
+	//endregion
+
+	//region UUID
+	public UUID readUUID() {
+		return new UUID(readLong(), readLong());
+	}
+
+	public void writeUUID(UUID uuid) {
+		writeLong(uuid.getMostSignificantBits());
+		writeLong(uuid.getLeastSignificantBits());
+	}
+	//endregion
+}
--- a/protocol/src/main/java/mc/protocol/buffer/NetIOException.java
+++ b/protocol/src/main/java/mc/protocol/buffer/NetIOException.java
@@ -0,0 +1,8 @@
+package mc.protocol.buffer;
+
+public class NetIOException extends RuntimeException {
+
+    public NetIOException(String message) {
+        super(message);
+    }
+}
--- a/protocol/src/main/java/mc/protocol/handler/ProtocolHandlersBus.java
+++ b/protocol/src/main/java/mc/protocol/handler/ProtocolHandlersBus.java
@@ -0,0 +1,30 @@
+package mc.protocol.handler;
+
+import io.netty.channel.ChannelHandlerContext;
+import mc.protocol.State;
+import mc.protocol.packets.ClientSidePacket;
+import mc.protocol.utils.Table;
+
+@SuppressWarnings({ "rawtypes", "unchecked" })
+public class ProtocolHandlersBus {
+
+	private final Table<State, Class<? extends ClientSidePacket>, Handler> table = new Table<>();
+
+	public <P extends ClientSidePacket> ProtocolHandlersBus addHandler(State state, Class<P> packetClass, Handler<P> handler) {
+		table.put(state, packetClass, handler);
+		return this;
+	}
+
+	public <P extends ClientSidePacket> void process(State state, ChannelHandlerContext ctx, P packet) {
+		Handler handler = table.getColumnAndRow(state, packet.getClass());
+
+		if (handler != null) {
+			handler.handle(ctx, packet);
+		}
+	}
+
+	@FunctionalInterface
+	public interface Handler<P extends ClientSidePacket> {
+		void handle(ChannelHandlerContext ctx, P packet);
+	}
+}
--- a/protocol/src/main/java/mc/protocol/handler/ProtocolInboundHandler.java
+++ b/protocol/src/main/java/mc/protocol/handler/ProtocolInboundHandler.java
@@ -0,0 +1,39 @@
+package mc.protocol.handler;
+
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.SimpleChannelInboundHandler;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import mc.protocol.ProtocolAttributes;
+import mc.protocol.State;
+import mc.protocol.packets.ClientSidePacket;
+
+import java.io.IOException;
+import java.util.Objects;
+
+@Slf4j
+@RequiredArgsConstructor
+public class ProtocolInboundHandler extends SimpleChannelInboundHandler<ClientSidePacket> {
+
+	private static final String CLIENT_FORCE_DISCONNECTED_IOEXCEPTION_MESSAGE_RU = "Программа на вашем хост-компьютере разорвала установленное подключение";
+
+	private final ProtocolHandlersBus protocolHandlersBus;
+
+	@Override
+	protected void channelRead0(ChannelHandlerContext ctx, ClientSidePacket packet) {
+		State state = Objects.requireNonNull(ctx.channel().attr(ProtocolAttributes.STATE).get());
+		protocolHandlersBus.process(state, ctx, packet);
+	}
+
+	@Override
+	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
+		if (cause instanceof IOException && cause.getLocalizedMessage().equalsIgnoreCase(CLIENT_FORCE_DISCONNECTED_IOEXCEPTION_MESSAGE_RU)) {
+			log.warn("Client '{}' force disconnected", ctx.channel().remoteAddress());
+			if (log.isTraceEnabled()) {
+				log.trace("{}", cause.getMessage(), cause);
+			}
+		} else {
+			log.error("{}", cause.getMessage(), cause);
+		}
+	}
+}
--- a/protocol/src/main/java/mc/protocol/handler/codec/ProtocolDecoder.java
+++ b/protocol/src/main/java/mc/protocol/handler/codec/ProtocolDecoder.java
@@ -0,0 +1,65 @@
+package mc.protocol.handler.codec;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.handler.codec.ByteToMessageDecoder;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import mc.protocol.ProtocolAttributes;
+import mc.protocol.State;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.packets.ClientSidePacket;
+import mc.protocol.packets.UnknownPacket;
+import mc.protocol.pool.PacketObjectPool;
+
+import java.util.List;
+import java.util.Objects;
+
+@Slf4j
+@RequiredArgsConstructor
+public class ProtocolDecoder extends ByteToMessageDecoder {
+
+	private final boolean readUnknownPackets;
+
+	@Override
+	public void channelActive(ChannelHandlerContext ctx) {
+		ctx.channel().attr(ProtocolAttributes.STATE).set(State.HANDSHAKING);
+	}
+
+	@Override
+	protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
+		State state = Objects.requireNonNull(ctx.channel().attr(ProtocolAttributes.STATE).get());
+		NetByteBuf netByteBuf = new NetByteBuf(in);
+
+		int packetId = netByteBuf.readVarInt();
+		Class<? extends ClientSidePacket> packetClass = state.getClientSidePacketById(packetId);
+		if (packetClass == null) {
+			log.warn("Unknown packet: State {} ; Id 0x{}", state, packetIdAsHexcode(packetId));
+
+			if (readUnknownPackets) {
+				UnknownPacket unknownPacket = new UnknownPacket();
+				unknownPacket.setState(state);
+				unknownPacket.setId(packetId);
+				unknownPacket.setDataSize(netByteBuf.readableBytes());
+				unknownPacket.readSelf(netByteBuf);
+				out.add(unknownPacket);
+			} else {
+				netByteBuf.skipBytes(netByteBuf.readableBytes());
+			}
+		} else {
+			ClientSidePacket packet = PacketObjectPool.getInstance().getPool(packetClass).borrowObject();
+			packet.readSelf(netByteBuf);
+			if (log.isDebugEnabled()) {
+				log.debug("IN: {}:{}", state, packet);
+			}
+			out.add(packet);
+		}
+	}
+
+	private static String packetIdAsHexcode(int packetId) {
+		String hexPacketId = Integer.toHexString(packetId).toUpperCase();
+		if (hexPacketId.length() == 1) hexPacketId = "0" + hexPacketId;
+
+		return hexPacketId;
+	}
+}
--- a/protocol/src/main/java/mc/protocol/handler/codec/ProtocolEncoder.java
+++ b/protocol/src/main/java/mc/protocol/handler/codec/ProtocolEncoder.java
@@ -0,0 +1,39 @@
+package mc.protocol.handler.codec;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.handler.codec.MessageToByteEncoder;
+import lombok.extern.slf4j.Slf4j;
+import mc.protocol.ProtocolAttributes;
+import mc.protocol.State;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.packets.ServerSidePacket;
+
+import java.util.Objects;
+
+@Slf4j
+public class ProtocolEncoder extends MessageToByteEncoder<ServerSidePacket> {
+
+	@Override
+	protected void encode(ChannelHandlerContext ctx, ServerSidePacket packet, ByteBuf out) {
+		State state = Objects.requireNonNull(ctx.channel().attr(ProtocolAttributes.STATE).get());
+		Integer packetId = state.getServerSidePacketId(packet.getClass());
+		if (packetId == null) {
+			log.error("Unknown send packet: State {} ; Class {}", state, packet.getClass());
+			return;
+		}
+
+		if (log.isDebugEnabled()) {
+			log.debug("OUT: {}:{}", state, packet);
+		}
+
+		NetByteBuf buffer = new NetByteBuf(Unpooled.buffer());
+		buffer.writeVarInt(packetId);
+		packet.writeSelf(buffer);
+
+		NetByteBuf netByteBuf = new NetByteBuf(out);
+		netByteBuf.writeVarInt(buffer.readableBytes());
+		netByteBuf.writeBytes(buffer);
+	}
+}
--- a/protocol/src/main/java/mc/protocol/handler/codec/ProtocolSplitter.java
+++ b/protocol/src/main/java/mc/protocol/handler/codec/ProtocolSplitter.java
@@ -0,0 +1,40 @@
+package mc.protocol.handler.codec;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.handler.codec.ByteToMessageDecoder;
+import mc.protocol.buffer.NetByteBuf;
+
+import java.util.List;
+
+public class ProtocolSplitter extends ByteToMessageDecoder {
+
+	@Override
+	protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) {
+		NetByteBuf netByteBuf = new NetByteBuf(in);
+		netByteBuf.markReaderIndex();
+
+		do {
+			byte[] sizePacketRaw = new byte[3];
+			for (int i = 0; i < 3; ++i) {
+				sizePacketRaw[i] = netByteBuf.readByte();
+
+				if (sizePacketRaw[i] >= 0) {
+					break;
+				}
+			}
+
+			int sizePacket = new NetByteBuf(Unpooled.wrappedBuffer(sizePacketRaw)).readVarInt();
+
+			if (netByteBuf.readableBytes() >= sizePacket) {
+				byte[] bytes = new byte[sizePacket];
+				netByteBuf.readBytes(bytes);
+				out.add(Unpooled.wrappedBuffer(bytes));
+			} else {
+				netByteBuf.resetReaderIndex();
+				break;
+			}
+		} while (netByteBuf.readableBytes() > 0);
+	}
+}
--- a/protocol/src/main/java/mc/protocol/model/Location.java
+++ b/protocol/src/main/java/mc/protocol/model/Location.java
@@ -0,0 +1,18 @@
+package mc.protocol.model;
+
+import lombok.Data;
+
+@Data
+public class Location {
+	private double x = 0d;
+	private double y = 0d;
+	private double z = 0d;
+
+	public Location set(double x, double y, double z) {
+		this.x = x;
+		this.y = y;
+		this.z = z;
+
+		return this;
+	}
+}
--- a/protocol/src/main/java/mc/protocol/model/Look.java
+++ b/protocol/src/main/java/mc/protocol/model/Look.java
@@ -0,0 +1,16 @@
+package mc.protocol.model;
+
+import lombok.Data;
+
+@Data
+public class Look {
+	private float yaw;
+	private float pitch;
+
+	public Look set(float yaw, float pitch) {
+		this.yaw = yaw;
+		this.pitch = pitch;
+
+		return this;
+	}
+}
--- a/protocol/src/main/java/mc/protocol/model/ServerInfo.java
+++ b/protocol/src/main/java/mc/protocol/model/ServerInfo.java
@@ -0,0 +1,50 @@
+package mc.protocol.model;
+
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+import lombok.RequiredArgsConstructor;
+import lombok.EqualsAndHashCode;
+import lombok.experimental.Accessors;
+import mc.protocol.model.text.Text;
+
+import java.util.List;
+
+@Accessors(fluent = true)
+@Getter
+@Setter
+@ToString
+public class ServerInfo {
+
+	private final Version version = new Version();
+	private final Players players = new Players();
+
+	private Text description;
+	private String favicon;
+
+	@Getter
+	@Setter
+	@ToString
+	public static class Version {
+		private String name;
+		private int protocol;
+	}
+
+	@Getter
+	@Setter
+	@ToString
+	public static class Players {
+		private int max;
+		private int online;
+		private List<SamplePlayer> sample;
+	}
+
+	@RequiredArgsConstructor
+	@Getter
+	@EqualsAndHashCode
+	@ToString
+	public static class SamplePlayer {
+		private final String id;
+		private final String name;
+	}
+}
--- a/protocol/src/main/java/mc/protocol/model/ServerInfoSerializer.java
+++ b/protocol/src/main/java/mc/protocol/model/ServerInfoSerializer.java
@@ -0,0 +1,59 @@
+package mc.protocol.model;
+
+import com.eclipsesource.json.Json;
+import com.eclipsesource.json.JsonArray;
+import com.eclipsesource.json.JsonObject;
+import lombok.experimental.UtilityClass;
+import mc.protocol.model.text.TextSerializer;
+
+import java.util.Spliterator;
+import java.util.Spliterators;
+import java.util.stream.Collector;
+import java.util.stream.StreamSupport;
+
+@UtilityClass
+public class ServerInfoSerializer {
+
+	public String toStringPlain(ServerInfo info) {
+		return toJsonObject(info).toString();
+	}
+
+	private JsonObject toJsonObject(ServerInfo info) {
+		JsonObject jsonObject = Json.object()
+				.add("version", createVersionObj(info))
+				.add("players", createPlayersObj(info))
+				.add("description", TextSerializer.toJsonObject(info.description()));
+
+		if (info.favicon() != null && !info.favicon().isEmpty()) {
+			jsonObject.add("favicon", info.favicon());
+		}
+
+		return jsonObject;
+	}
+
+	private JsonObject createVersionObj(ServerInfo info) {
+		return Json.object()
+				.add("name", info.version().name())
+				.add("protocol", info.version().protocol());
+	}
+
+	private JsonObject createPlayersObj(ServerInfo info) {
+		JsonArray sampleArr = info.players().sample().stream()
+				.map(samplePlayer -> Json.object()
+						.add("name", samplePlayer.name())
+						.add("id", samplePlayer.id()))
+				.collect(Collector.of(Json::array, JsonArray::add, ServerInfoSerializer::jsonArrayAddAll));
+
+		return Json.object()
+				.add("max", info.players().max())
+				.add("online", info.players().online())
+				.add("sample", sampleArr);
+	}
+
+	private static JsonArray jsonArrayAddAll(JsonArray jsonArrayTo, JsonArray jsonArrayFrom) {
+		StreamSupport.stream(
+				Spliterators.spliteratorUnknownSize(jsonArrayFrom.iterator(), Spliterator.ORDERED), false)
+				.forEach(jsonArrayTo::add);
+		return jsonArrayTo;
+	}
+}
--- a/protocol/src/main/java/mc/protocol/model/text/Text.java
+++ b/protocol/src/main/java/mc/protocol/model/text/Text.java
@@ -0,0 +1,151 @@
+package mc.protocol.model.text;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
+import lombok.Getter;
+import lombok.experimental.Accessors;
+
+import javax.annotation.Nullable;
+import java.util.ArrayList;
+import java.util.List;
+
+@Accessors(fluent = true)
+@AllArgsConstructor
+@Data
+public class Text {
+
+	private TextColor color;
+	private TextStyle style;
+	private String content;
+	private List<Text> children;
+
+	public static Text of(String string) {
+		return new Text(null, null, string, null);
+	}
+
+	public static Text of(TextColor color, String string) {
+		return new Text(color, null, string, null);
+	}
+
+	public static Text of(TextStyle style, String string) {
+		return new Text(null, style, string, null);
+	}
+
+	public static Text of(TextColor color, TextStyle style, String string) {
+		return new Text(color, style, string, null);
+	}
+
+	public static Builder builder() {
+		return new Builder();
+	}
+
+	@NoArgsConstructor
+	@ToString
+	public static class Builder {
+
+		@Getter(onMethod = @__(@Nullable))
+		private StringBuilder contentBuilder;
+		private TextStyle.Builder styleBuilder;
+		private TextColor color;
+		private List<Text> children;
+
+		public Builder append(char content) {
+			if (this.contentBuilder == null) {
+				this.contentBuilder = new StringBuilder();
+			}
+
+			this.contentBuilder.append(content);
+			return this;
+		}
+
+		public Builder append(String content) {
+			if (this.contentBuilder == null) {
+				this.contentBuilder = new StringBuilder(content);
+			} else {
+				this.contentBuilder.append(content);
+			}
+			return this;
+		}
+
+		public Builder append(Text text) {
+			if (children == null) {
+				children = new ArrayList<>();
+			}
+
+			children.add(text);
+			return this;
+		}
+
+		public Builder style(TextStyle style) {
+			//@formatter:off
+			if (style.bold() != null) bold(style.bold());
+			if (style.italic() != null) italic(style.italic());
+			if (style.underline() != null) underline(style.underline());
+			if (style.strikethrough() != null) strikethrough(style.strikethrough());
+			if (style.obfuscated() != null) obfuscated(style.obfuscated());
+			//@formatter:on
+
+			return this;
+		}
+
+		public Builder color(TextColor color) {
+			this.color = color;
+			return this;
+		}
+
+		public Builder bold(Boolean bold) {
+			if (this.styleBuilder == null) {
+				this.styleBuilder = TextStyle.builder();
+			}
+
+			this.styleBuilder.bold(bold);
+			return this;
+		}
+
+		public Builder italic(Boolean italic) {
+			if (this.styleBuilder == null) {
+				this.styleBuilder = TextStyle.builder();
+			}
+
+			this.styleBuilder.italic(italic);
+			return this;
+		}
+
+		public Builder underline(Boolean underline) {
+			if (this.styleBuilder == null) {
+				this.styleBuilder = TextStyle.builder();
+			}
+
+			this.styleBuilder.underline(underline);
+			return this;
+		}
+
+		public Builder strikethrough(Boolean strikethrough) {
+			if (this.styleBuilder == null) {
+				this.styleBuilder = TextStyle.builder();
+			}
+
+			this.styleBuilder.strikethrough(strikethrough);
+			return this;
+		}
+
+		public Builder obfuscated(Boolean obfuscated) {
+			if (this.styleBuilder == null) {
+				this.styleBuilder = TextStyle.builder();
+			}
+
+			this.styleBuilder.obfuscated(obfuscated);
+			return this;
+		}
+
+		public Text build() {
+			return new Text(
+					color,
+					styleBuilder == null ? null : styleBuilder.build(),
+					contentBuilder == null ? null : contentBuilder.toString(),
+					children);
+		}
+	}
+}
--- a/protocol/src/main/java/mc/protocol/model/text/TextColor.java
+++ b/protocol/src/main/java/mc/protocol/model/text/TextColor.java
@@ -0,0 +1,30 @@
+package mc.protocol.model.text;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+@Getter
+public enum TextColor {
+	//@formatter:off
+	BLACK      ("black",       '0'),
+	DARK_BLUE  ("dark_blue",   '1'),
+	DARK_GREEN ("dark_green",  '2'),
+	DARK_AQUA  ("dark_aqua",   '3'),
+	DARK_RED   ("dark_red",    '4'),
+	DARK_PUEPLE("dark_purple", '5'),
+	GOLD       ("gold",        '6'),
+	GRAY       ("gray",        '7'),
+	DARK_GRAY  ("dark_gray",   '8'),
+	BLUE       ("blue",        '9'),
+	GREEN      ("green",       'a'),
+	AQUA       ("aqua",        'b'),
+	RED        ("red",         'c'),
+	PURPLE     ("light_purple",'d'),
+	YELLOW     ("yellow",      'e'),
+	WHITE      ("white",       'f');
+	//@formatter:on
+
+	private final String name;
+	private final char code;
+}
--- a/protocol/src/main/java/mc/protocol/model/text/TextSerializer.java
+++ b/protocol/src/main/java/mc/protocol/model/text/TextSerializer.java
@@ -0,0 +1,130 @@
+package mc.protocol.model.text;
+
+import com.eclipsesource.json.Json;
+import com.eclipsesource.json.JsonArray;
+import com.eclipsesource.json.JsonObject;
+import lombok.experimental.UtilityClass;
+
+import java.util.Map;
+
+@UtilityClass
+public class TextSerializer {
+
+	private static final Map<Character, TextStyle> legacyStyleCodes;
+	private static final Map<Character, TextColor> legacyColorCodes;
+
+	public String toStringPlain(Text text) {
+		return toJsonObject(text).toString();
+	}
+
+	public JsonObject toJsonObject(Text text) {
+		JsonObject jsonObject = Json.object();
+
+		if (text.content() != null) {
+			jsonObject.add("text", text.content());
+		}
+
+		if (text.color() != null) {
+			jsonObject.add("color", text.color().getName());
+		}
+
+		if (text.style() != null) {
+			//@formatter:off
+			if (text.style().bold() != null) jsonObject.add("bold", text.style().bold());
+			if (text.style().italic() != null) jsonObject.add("italic", text.style().italic());
+			if (text.style().underline() != null) jsonObject.add("underline", text.style().underline());
+			if (text.style().strikethrough() != null) jsonObject.add("strikethrough", text.style().strikethrough());
+			if (text.style().obfuscated() != null) jsonObject.add("obfuscated", text.style().obfuscated());
+			//@formatter:on
+		}
+
+		if (text.children() != null && !text.children().isEmpty()) {
+			JsonArray extra = Json.array();
+			text.children().forEach(child -> extra.add(toJsonObject(child)));
+			jsonObject.add("extra", extra);
+		}
+
+		return jsonObject;
+	}
+
+	/**
+	 * Преобразование строки вида "&4красный" в {@link Text}.
+	 *
+	 * @param string тест
+	 * @return Text
+	 */
+	@SuppressWarnings({"java:S3776", "java:S2583", "java:S135"})
+	public Text fromPlain(String string) {
+		boolean flagSys = false;
+		Text.Builder rootTextBuilder = Text.builder();
+		Text.Builder textBuilder = rootTextBuilder;
+
+		for (char ch : string.toCharArray()) {
+			if (!flagSys) {
+				if ('&' == ch) {
+					flagSys = true;
+				} else {
+					textBuilder.append(ch);
+				}
+				continue;
+			}
+
+			if (!legacyStyleCodes.containsKey(ch) && !legacyColorCodes.containsKey(ch) && '&' == ch) {
+				textBuilder.append('&');
+				flagSys = false;
+				continue;
+			}
+
+			//noinspection ConstantConditions
+			if (textBuilder.contentBuilder() != null && textBuilder.contentBuilder().length() > 0) {
+				if (textBuilder != rootTextBuilder) {
+					rootTextBuilder.append(textBuilder.build());
+				}
+				textBuilder = Text.builder();
+			}
+
+			if (legacyStyleCodes.containsKey(ch)) {
+				textBuilder.style(legacyStyleCodes.get(ch));
+			} else {
+				textBuilder.color(legacyColorCodes.get(ch));
+			}
+
+			flagSys = false;
+		}
+
+		if (textBuilder != rootTextBuilder) {
+			rootTextBuilder.append(textBuilder.build());
+		}
+
+		return rootTextBuilder.build();
+	}
+
+	static {
+		legacyColorCodes = Map.ofEntries(
+				Map.entry('0', TextColor.BLACK),
+				Map.entry('1', TextColor.DARK_BLUE),
+				Map.entry('2', TextColor.DARK_GREEN),
+				Map.entry('3', TextColor.DARK_AQUA),
+				Map.entry('4', TextColor.DARK_RED),
+				Map.entry('5', TextColor.DARK_PUEPLE),
+				Map.entry('6', TextColor.GOLD),
+				Map.entry('7', TextColor.GRAY),
+				Map.entry('8', TextColor.DARK_GRAY),
+				Map.entry('9', TextColor.BLUE),
+				Map.entry('a', TextColor.GREEN),
+				Map.entry('b', TextColor.AQUA),
+				Map.entry('c', TextColor.RED),
+				Map.entry('d', TextColor.PURPLE),
+				Map.entry('e', TextColor.YELLOW),
+				Map.entry('f', TextColor.WHITE)
+		);
+
+		legacyStyleCodes = Map.of(
+				'k', TextStyle.OBFUSCATED,
+				'l', TextStyle.BOLD,
+				'm', TextStyle.STRIKETHOUGH,
+				'n', TextStyle.UNDERLINE,
+				'o', TextStyle.ITALIC
+		);
+	}
+}
--- a/protocol/src/main/java/mc/protocol/model/text/TextStyle.java
+++ b/protocol/src/main/java/mc/protocol/model/text/TextStyle.java
@@ -0,0 +1,82 @@
+package mc.protocol.model.text;
+
+import lombok.*;
+import lombok.experimental.Accessors;
+
+@AllArgsConstructor(access = AccessLevel.PRIVATE)
+@Accessors(fluent = true)
+@Data
+@SuppressWarnings("java:S1845")
+public class TextStyle {
+
+	public static final TextStyle BOLD = new TextStyle(true, null, null, null, null);
+	public static final TextStyle ITALIC = new TextStyle(null, true, null, null, null);
+	public static final TextStyle UNDERLINE = new TextStyle(null, null, true, null, null);
+	public static final TextStyle STRIKETHOUGH = new TextStyle(null, null, null, true, null);
+	public static final TextStyle OBFUSCATED = new TextStyle(null, null, null, null, true);
+
+	public static final TextStyle RESET = new TextStyle(false, false, false, false, false);
+	public static final TextStyle NONE = new TextStyle(null, null, null, null, null);
+
+	private Boolean bold;
+	private Boolean italic;
+	private Boolean underline;
+	private Boolean strikethrough;
+	private Boolean obfuscated;
+
+	public static Builder builder() {
+		return new TextStyle.Builder();
+	}
+
+	@NoArgsConstructor
+	@ToString
+	public static class Builder {
+
+		private Boolean bold;
+		private Boolean italic;
+		private Boolean underline;
+		private Boolean strikethrough;
+		private Boolean obfuscated;
+
+		public Builder bold(Boolean bold) {
+			this.bold = bold;
+			return this;
+		}
+
+		public Builder italic(Boolean italic) {
+			this.italic = italic;
+			return this;
+		}
+
+		public Builder underline(Boolean underline) {
+			this.underline = underline;
+			return this;
+		}
+
+		public Builder strikethrough(Boolean strikethrough) {
+			this.strikethrough = strikethrough;
+			return this;
+		}
+
+		public Builder obfuscated(Boolean obfuscated) {
+			this.obfuscated = obfuscated;
+			return this;
+		}
+
+		public Builder merge(TextStyle style) {
+			//@formatter:off
+			if (style.bold != null) this.bold = style.bold;
+			if (style.italic != null) this.italic = style.italic;
+			if (style.underline != null) this.underline = style.underline;
+			if (style.strikethrough != null) this.strikethrough = style.strikethrough;
+			if (style.obfuscated != null) this.obfuscated = style.obfuscated;
+			//@formatter:on
+
+			return this;
+		}
+
+		public TextStyle build() {
+			return new TextStyle(bold, italic, underline, strikethrough, obfuscated);
+		}
+	}
+}
--- a/protocol/src/main/java/mc/protocol/packets/ClientSidePacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/ClientSidePacket.java
@@ -0,0 +1,12 @@
+package mc.protocol.packets;
+
+import mc.protocol.buffer.NetByteBuf;
+import mc.utils.pool.Passivable;
+
+/**
+ * Пакеты отправляемые клиентом.
+ */
+public interface ClientSidePacket extends Packet, Passivable {
+
+	void readSelf(NetByteBuf netByteBuf);
+}
--- a/protocol/src/main/java/mc/protocol/packets/KeepAlivePacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/KeepAlivePacket.java
@@ -0,0 +1,46 @@
+package mc.protocol.packets;
+
+import lombok.Data;
+import mc.protocol.buffer.NetByteBuf;
+
+/**
+ * Пинг-пакет.
+ *
+ * <p>Эхо-пакет, которым проверяется качество соединения между <b>Клиентом</b> и <b>Сервером</b>.</p>
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD   | TYPE | NOTES                  |
+ * |---------|------|------------------------|
+ * | Payload | Long | Любое уникальное число |
+ * </pre>
+ *
+ * <p>По спецификации:</p>
+ * <oi>
+ *     <li>если Сервер не ответил Клиенту в течении 20 секунд, Клиент отключается и выдаёт ошибку "Timed out";</li>
+ *     <li>если Клиент не отвечает Серверу в течении 30 секунд, Сервер отключает Клиента.</li>
+ * </oi>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Keep_Alive_.28clientbound.29">Keep Alive (clientbound)</a>
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Keep_Alive_.28serverbound.29">Keep Alive (serverbound)</a>
+ */
+@Data
+public class KeepAlivePacket implements ClientSidePacket, ServerSidePacket {
+
+	private long payload;
+
+	@Override
+	public void readSelf(NetByteBuf netByteBuf) {
+		payload = netByteBuf.readLong();
+	}
+
+	@Override
+	public void writeSelf(NetByteBuf netByteBuf) {
+		netByteBuf.writeLong(payload);
+	}
+
+	@Override
+	public void passivate() {
+		this.payload = 0;
+	}
+}
--- a/protocol/src/main/java/mc/protocol/packets/Packet.java
+++ b/protocol/src/main/java/mc/protocol/packets/Packet.java
@@ -0,0 +1,19 @@
+package mc.protocol.packets;
+
+/**
+ * Сетевой пакет.
+ *
+ * <p>Структура</p>
+ * <pre>
+ * | FIELD       | TYPE   | NOTES                                     |
+ * |-------------|--------|-------------------------------------------|
+ * | SIZE        | VarInt | = sizeOf(PACKET ID) + sizeOf(PACKET DATA) |
+ * | PACKET ID   | VarInt |                                           |
+ * | PACKET DATA | bytes  |                                           |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=7368#Without_compression">Packet without compression</a>
+ */
+public interface Packet {
+
+}
--- a/protocol/src/main/java/mc/protocol/packets/ServerSidePacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/ServerSidePacket.java
@@ -0,0 +1,11 @@
+package mc.protocol.packets;
+
+import mc.protocol.buffer.NetByteBuf;
+
+/**
+ * Пакеты отправляемые сервером.
+ */
+public interface ServerSidePacket extends Packet {
+
+	void writeSelf(NetByteBuf netByteBuf);
+}
--- a/protocol/src/main/java/mc/protocol/packets/UnknownPacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/UnknownPacket.java
@@ -0,0 +1,32 @@
+package mc.protocol.packets;
+
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
+import mc.protocol.State;
+import mc.protocol.buffer.NetByteBuf;
+
+@NoArgsConstructor
+@Data
+@ToString(exclude = "rawData")
+public class UnknownPacket implements ClientSidePacket {
+
+    private State state;
+    private int id;
+    private int dataSize;
+    private byte[] rawData;
+
+    @Override
+    public void readSelf(NetByteBuf netByteBuf) {
+        rawData = new byte[dataSize];
+        netByteBuf.readBytes(rawData);
+    }
+
+    @Override
+    public void passivate() {
+        this.state = null;
+        this.id = 0;
+        this.dataSize = 0;
+        this.rawData = null;
+    }
+}
--- a/protocol/src/main/java/mc/protocol/packets/handshaking/client/HandshakePacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/handshaking/client/HandshakePacket.java
@@ -0,0 +1,57 @@
+package mc.protocol.packets.handshaking.client;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
+import mc.protocol.State;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.packets.ClientSidePacket;
+
+/**
+ * Handshake packet.
+ *
+ * <p>Данный пакет заставляет сервер переключить текущий {@link State}</p>
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD            | TYPE           | NOTES                                        |
+ * |------------------|----------------|----------------------------------------------|
+ * | Protocol version | VarInt         | Версия протокола [1]                         |
+ * | Server address   | Stirng (255)   | Hostname или IP                              |
+ * | Server port      | Unsigned Short | Порт сервера                                 |
+ * | Next state       | VarInt         | ID State на который необходимо переключиться |
+ *
+ * [1] - <a href="https://wiki.vg/Protocol_version_numbers">Protocol version numbers</a>
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Handshake">Handshake</a>
+ * @see State
+ */
+@NoArgsConstructor
+@Getter
+@EqualsAndHashCode
+@ToString
+public class HandshakePacket implements ClientSidePacket {
+
+	private int protocolVersion;
+	private String host;
+	private int port;
+	private State nextState;
+
+	@Override
+	public void readSelf(NetByteBuf netByteBuf) {
+		this.protocolVersion = netByteBuf.readVarInt();
+		this.host = netByteBuf.readString(255);
+		this.port = netByteBuf.readUnsignedShort();
+		this.nextState = State.getById(netByteBuf.readVarInt());
+	}
+
+	@Override
+	public void passivate() {
+		this.protocolVersion = 0;
+		this.host = null;
+		this.port = 0;
+		this.nextState = null;
+	}
+}
--- a/protocol/src/main/java/mc/protocol/packets/login/client/LoginStartPacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/login/client/LoginStartPacket.java
@@ -0,0 +1,42 @@
+package mc.protocol.packets.login.client;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.packets.ClientSidePacket;
+
+/**
+ * Login start packet.
+ *
+ * <p>Начало авторизации.</p>
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD | TYPE   | NOTES            |
+ * |-------|--------|------------------|
+ * | Name  | String | Имя/Логин игрока |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Login_Start">Login start</a>
+ */
+@NoArgsConstructor
+@Getter
+@EqualsAndHashCode
+@ToString
+public class LoginStartPacket implements ClientSidePacket {
+
+	private String name;
+
+	@Override
+	public void readSelf(NetByteBuf netByteBuf) {
+		this.name = netByteBuf.readString();
+	}
+
+	@Override
+	public void passivate() {
+		this.name = null;
+	}
+
+}
--- a/protocol/src/main/java/mc/protocol/packets/login/server/DisconnectPacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/login/server/DisconnectPacket.java
@@ -0,0 +1,43 @@
+package mc.protocol.packets.login.server;
+
+import lombok.Data;
+import mc.protocol.State;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.model.text.Text;
+import mc.protocol.packets.ServerSidePacket;
+
+/**
+ * Diconnect packet.
+ *
+ * <p>Отключение клиента сервером с указанием причины.</p>
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD       | TYPE   | NOTES                            |
+ * |-------------|--------|----------------------------------|
+ * | JSON Reason | Text   | Причина отключения. Опционально. |
+ * </pre>
+ *
+ * <p>Пример JSON Reason</p>
+ * <pre>
+ * {
+ *     "text": "foo"
+ * }
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Disconnect_.28login.29">Disconnect (login)</a>
+ * @see State
+ */
+@Data
+public class DisconnectPacket implements ServerSidePacket {
+
+	/**
+	 * Причина отключения.
+	 */
+	private Text reason;
+
+	@Override
+	public void writeSelf(NetByteBuf netByteBuf) {
+		netByteBuf.writeText(reason);
+	}
+}
--- a/protocol/src/main/java/mc/protocol/packets/login/server/LoginSuccessPacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/login/server/LoginSuccessPacket.java
@@ -0,0 +1,33 @@
+package mc.protocol.packets.login.server;
+
+import lombok.Data;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.packets.ServerSidePacket;
+
+import java.util.UUID;
+
+/**
+ * Подтверждение успешного логина.
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD    | TYPE        | NOTES                         |
+ * |----------|-------------|-------------------------------|
+ * | UUID     | String (36) | Уникальный ID игрока          |
+ * | Username | String (16) | Имя игрока, выданное сервером |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Login_Success">Login Success</a>
+ */
+@Data
+public class LoginSuccessPacket implements ServerSidePacket {
+
+	private UUID uuid;
+	private String name;
+
+	@Override
+	public void writeSelf(NetByteBuf netByteBuf) {
+		netByteBuf.writeString(this.uuid.toString());
+		netByteBuf.writeString(this.name);
+	}
+}
--- a/protocol/src/main/java/mc/protocol/packets/play/client/CPlayerPositionAndLookPacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/play/client/CPlayerPositionAndLookPacket.java
@@ -0,0 +1,68 @@
+package mc.protocol.packets.play.client;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.model.Location;
+import mc.protocol.model.Look;
+import mc.protocol.packets.ClientSidePacket;
+import mc.protocol.pool.LocationObjectPool;
+import mc.protocol.pool.LookObjectPool;
+
+/**
+ * Клиент сообщает о движении и повороте головы Игрока.
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD     | TYPE    | NOTES                                                      |
+ * |-----------|---------|------------------------------------------------------------|
+ * | X         | Double  | Абсолютная позиция по X                                    |
+ * | Y         | Double  | Абсолютная позиция по Y.                                   |
+ * |           |         | Имеется ввиду позиция ног. Голова находиться выше на 1.62f |
+ * | Z         | Double  | Абсолютная позиция по Z                                    |
+ * | Yaw       | Float   | Абсолютный поворот головы по OX, в градусах                |
+ * | Pitch     | Float   | Абсолютный поворот головы по OY, в градусах                |
+ * | On Ground | Boolean | true, если Игрок находится на земле                        |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Player_Position_And_Look_.28serverbound.29">Player Position And Look (serverbound)</a>
+ */
+@NoArgsConstructor
+@Getter
+@EqualsAndHashCode
+@ToString
+public class CPlayerPositionAndLookPacket implements ClientSidePacket {
+
+	private Location position;
+	private Look look;
+	private boolean onGround;
+
+	@Override
+	public void readSelf(NetByteBuf netByteBuf) {
+		double x = netByteBuf.readDouble();
+		double y = netByteBuf.readDouble();
+		double z = netByteBuf.readDouble();
+		this.position = LocationObjectPool.borrowObject().set(x, y, z);
+
+		float yaw = netByteBuf.readFloat();
+		float pitch = netByteBuf.readFloat();
+		this.look = LookObjectPool.borrowObject().set(yaw, pitch);
+
+		this.onGround = netByteBuf.readBoolean();
+	}
+
+	@Override
+	public void passivate() {
+		LocationObjectPool.returnObject(this.position);
+		this.position = null;
+		LookObjectPool.returnObject(this.look);
+		this.look = null;
+		this.onGround = false;
+	}
+
+	public double getYPositionHead() {
+		return this.position.getY() + 1.62f;
+	}
+}
--- a/protocol/src/main/java/mc/protocol/packets/play/client/ClientSettingsPacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/play/client/ClientSettingsPacket.java
@@ -0,0 +1,104 @@
+package mc.protocol.packets.play.client;
+
+import lombok.*;
+import mc.protocol.utils.ChatMode;
+import mc.protocol.utils.MainHand;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.packets.ClientSidePacket;
+
+/**
+ * Client settings packet.
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD                | TYPE          | NOTES                                             |
+ * |--------------------  |---------------|---------------------------------------------------|
+ * | Locale               | String (16)   | например en_gb                                    |
+ * | View Distance        | Byte          | Дистанция отрисовки со стороны Клиента, в чанках. |
+ * | Chat Mode            | VarInt        | 0: enabled                                        |
+ * |                      |               | 1: commands only                                  |
+ * |                      |               | 2: hidden                                         |
+ * |                      |               | [1]                                               |
+ * | Chat Colors          | Boolean       | “Colors” multiplayer setting (???)                |
+ * | Displayed Skin Parts | Unsigned Byte | битовая маска отображения скина. См. ниже         |
+ * | Main Hand            | VarInt        | 0: Left                                           |
+ * |                      |               | 1: Right                                          |
+ *
+ * [1] - <a href="https://wiki.vg/index.php?title=Chat&oldid=13165#Processing_chat">Processing chat</a>
+ * </pre>
+ *
+ * <p>Биты "Displayed Skin Parts"</p>
+ * <pre>
+ * Bit 0 (0x01): Плащ (Cape)
+ * Bit 1 (0x02): Рубашка (Jacket)
+ * Bit 2 (0x04): Левый рукав (Left Sleeve)
+ * Bit 3 (0x08): Правый рукав (Right Sleeve)
+ * Bit 4 (0x10): Левая штанина (Left Pants Leg)
+ * Bit 5 (0x20): Правая штанина (Right Pants Leg)
+ * Bit 6 (0x40): Шлем (Hat)
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Client_Settings">Client Settings</a>
+ */
+@NoArgsConstructor
+@Getter
+@EqualsAndHashCode
+@ToString
+public class ClientSettingsPacket implements ClientSidePacket {
+
+	private String locale;
+	private int viewDistance;
+	private ChatMode chatMode;
+	private boolean chatColors;
+	@SuppressWarnings("java:S116")
+	private int $displayedSkinPartsBitMask;
+	private MainHand mainHand;
+
+	@Override
+	public void readSelf(NetByteBuf netByteBuf) {
+		this.locale = netByteBuf.readString(16);
+		this.viewDistance = netByteBuf.readByte();
+		this.chatMode = ChatMode.valueById(netByteBuf.readVarInt());
+		this.chatColors = netByteBuf.readBoolean();
+		this.$displayedSkinPartsBitMask = netByteBuf.readUnsignedByte();
+		this.mainHand = MainHand.valueById(netByteBuf.readVarInt());
+	}
+
+	@Override
+	public void passivate() {
+		this.locale = null;
+		this.viewDistance = 0;
+		this.chatMode = null;
+		this.chatColors = false;
+		this.$displayedSkinPartsBitMask = 0;
+		this.mainHand = null;
+	}
+
+	public boolean isCapeEnabled() {
+		return ($displayedSkinPartsBitMask & 0x01) > 0;
+	}
+
+	public boolean isJacketEnabled() {
+		return ($displayedSkinPartsBitMask & 0x02) > 0;
+	}
+
+	public boolean isLeftSleeveEnabled() {
+		return ($displayedSkinPartsBitMask & 0x04) > 0;
+	}
+
+	public boolean isRightSleeveEnabled() {
+		return ($displayedSkinPartsBitMask & 0x08) > 0;
+	}
+
+	public boolean isLeftPantsEnabled() {
+		return ($displayedSkinPartsBitMask & 0x10) > 0;
+	}
+
+	public boolean isRightPantsEnabled() {
+		return ($displayedSkinPartsBitMask & 0x20) > 0;
+	}
+
+	public boolean isHatEnabled() {
+		return ($displayedSkinPartsBitMask & 0x40) > 0;
+	}
+}
--- a/protocol/src/main/java/mc/protocol/packets/play/client/EntityActionPacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/play/client/EntityActionPacket.java
@@ -0,0 +1,77 @@
+package mc.protocol.packets.play.client;
+
+import lombok.*;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.packets.ClientSidePacket;
+
+import javax.annotation.Nullable;
+
+/**
+ * Entity Action packet.
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD      | TYPE   | NOTES                                     |
+ * |------------|--------|-------------------------------------------|
+ * | Entity ID  | VarInt | ID игрока                                 |
+ * | Action ID  | VarInt | ID действия                               |
+ * | Jump Boost | VarInt | Используется только при "Action ID" = 5.  |
+ * |            |        | В этом случае значение будет от 0 до 100. |
+ * |            |        | В остальных случаях значение 0.           |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Entity_Action" target="_top">Entity Action</a>
+ */
+@NoArgsConstructor
+@Getter
+@EqualsAndHashCode
+@ToString
+public class EntityActionPacket implements ClientSidePacket {
+
+	private Integer entityId;
+	private Action action;
+	private Integer jumpBoost;
+
+	@Override
+	public void readSelf(NetByteBuf netByteBuf) {
+		this.entityId = netByteBuf.readVarInt();
+		int actionId = netByteBuf.readVarInt();
+		this.jumpBoost = netByteBuf.readVarInt();
+
+		this.action = Action.valueOfCode(actionId);
+	}
+
+	@Override
+	public void passivate() {
+		this.entityId = null;
+		this.action = null;
+		this.jumpBoost = null;
+	}
+
+	@RequiredArgsConstructor
+	public enum Action {
+		START_SNEAKING(0),
+		STOP_SNEAKING(1),
+		LEAVE_BED(2),
+		START_SPRINTING(3),
+		STOP_SPRINTING(4),
+		START_JUMP_WITH_HORSE(5),
+		STOP_JUMP_WITH_HORSE(6),
+		OPEN_HORSE_INVENTORY(7),
+		START_FLYING_WITH_ELYTRA(8);
+
+		@Nullable
+		public static Action valueOfCode(int code) {
+			for (Action action : Action.values()) {
+				if (action.code == code) {
+					return action;
+				}
+			}
+
+			return null;
+		}
+
+		@Getter
+		private final int code;
+	}
+}
--- a/protocol/src/main/java/mc/protocol/packets/play/client/PlayerLookPacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/play/client/PlayerLookPacket.java
@@ -0,0 +1,50 @@
+package mc.protocol.packets.play.client;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.model.Look;
+import mc.protocol.packets.ClientSidePacket;
+import mc.protocol.pool.LookObjectPool;
+
+/**
+ * Клиент сообщает о повороте головы Игрока.
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD     | TYPE    | NOTES                                       |
+ * |-----------|---------|---------------------------------------------|
+ * | Yaw       | Float   | Абсолютный поворот головы по OX, в градусах |
+ * | Pitch     | Float   | Абсолютный поворот головы по OY, в градусах |
+ * | On Ground | Boolean | true, если Игрок находится на земле         |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Player_Look">Player Look</a>
+ */
+@NoArgsConstructor
+@Getter
+@EqualsAndHashCode
+@ToString
+public class PlayerLookPacket implements ClientSidePacket {
+
+	private Look look;
+	private boolean onGround;
+
+	@Override
+	public void readSelf(NetByteBuf netByteBuf) {
+		float yaw = netByteBuf.readFloat();
+		float pitch = netByteBuf.readFloat();
+		this.look = LookObjectPool.borrowObject().set(yaw, pitch);
+
+		this.onGround = netByteBuf.readBoolean();
+	}
+
+	@Override
+	public void passivate() {
+		LookObjectPool.returnObject(this.look);
+		this.look = null;
+		this.onGround = false;
+	}
+}
--- a/protocol/src/main/java/mc/protocol/packets/play/client/PlayerPositionPacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/play/client/PlayerPositionPacket.java
@@ -0,0 +1,57 @@
+package mc.protocol.packets.play.client;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.model.Location;
+import mc.protocol.packets.ClientSidePacket;
+import mc.protocol.pool.LocationObjectPool;
+
+/**
+ * Клиент сообщает о движении Игрока.
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD     | TYPE    | NOTES                               |
+ * |-----------|---------|-------------------------------------|
+ * | X         | Double  | Абсолютная позиция по X             |
+ * | Feet Y    | Double  | Абсолютная позиция ног по Y.        |
+ * |           |         | Голова находиться выше на 1.62f     |
+ * | Z         | Double  | Абсолютная позиция по Z             |
+ * | On Ground | Boolean | true, если Игрок находится на земле |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Player_Position">Player Position</a>
+ */
+@NoArgsConstructor
+@Getter
+@EqualsAndHashCode
+@ToString
+public class PlayerPositionPacket implements ClientSidePacket {
+
+	private Location position;
+	private boolean onGround;
+
+	@Override
+	public void readSelf(NetByteBuf netByteBuf) {
+		double x = netByteBuf.readDouble();
+		double y = netByteBuf.readDouble();
+		double z = netByteBuf.readDouble();
+		this.position = LocationObjectPool.borrowObject().set(x, y, z);
+
+		this.onGround = netByteBuf.readBoolean();
+	}
+
+	@Override
+	public void passivate() {
+		LocationObjectPool.returnObject(this.position);
+		this.position = null;
+		this.onGround = false;
+	}
+
+	public double getYPositionHead() {
+		return this.position.getY() + 1.62f;
+	}
+}
--- a/protocol/src/main/java/mc/protocol/packets/play/client/PluginMessagePacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/play/client/PluginMessagePacket.java
@@ -0,0 +1,48 @@
+package mc.protocol.packets.play.client;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.packets.ClientSidePacket;
+
+/**
+ * Plugin Message packet.
+ *
+ * <p>Канал связи для модов и плагинов.</p>
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD        | TYPE        | NOTES            |
+ * |--------------|-------------|------------------|
+ * | Channel name | String (20) | Название канала  |
+ * | Data         | Byte array  | Любые данные     |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Plugin_Message_.28serverbound.29">Plugin Message (serverbound)</a>
+ * @see <a href="https://wiki.vg/index.php?title=Plugin_channels&oldid=14089">Plugin channels</a>
+ * @see <a href="https://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/">Minecraft Plugin Channels + Messaging</a>
+ */
+@NoArgsConstructor
+@Getter
+@EqualsAndHashCode
+@ToString
+public class PluginMessagePacket implements ClientSidePacket {
+
+	private String channelName;
+	private byte[] rawData;
+
+	@Override
+	public void readSelf(NetByteBuf netByteBuf) {
+		this.channelName = netByteBuf.readString(20);
+		this.rawData = new byte[netByteBuf.readableBytes()];
+		netByteBuf.readBytes(this.rawData);
+	}
+
+	@Override
+	public void passivate() {
+		this.channelName = null;
+		this.rawData = null;
+	}
+}
--- a/protocol/src/main/java/mc/protocol/packets/play/client/TeleportConfirmPacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/play/client/TeleportConfirmPacket.java
@@ -0,0 +1,41 @@
+package mc.protocol.packets.play.client;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.packets.ClientSidePacket;
+import mc.protocol.packets.play.server.SPlayerPositionAndLookPacket;
+
+/**
+ * Teleport сonfirm packet.
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD       | TYPE   | NOTES                                                      |
+ * |-------------|--------|------------------------------------------------------------|
+ * | Teleport ID | VarInt | ID, который был выдан пакетом {@link SPlayerPositionAndLookPacket} |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=7368#Login_Start" target="_top">Login start</a>
+ * @see SPlayerPositionAndLookPacket
+ */
+@NoArgsConstructor
+@Getter
+@EqualsAndHashCode
+@ToString
+public class TeleportConfirmPacket implements ClientSidePacket {
+
+	private int teleportId;
+
+	@Override
+	public void readSelf(NetByteBuf netByteBuf) {
+		this.teleportId = netByteBuf.readVarInt();
+	}
+
+	@Override
+	public void passivate() {
+		this.teleportId = 0;
+	}
+}
--- a/protocol/src/main/java/mc/protocol/packets/play/server/ChunkDataPacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/play/server/ChunkDataPacket.java
@@ -0,0 +1,108 @@
+package mc.protocol.packets.play.server;
+
+import io.netty.buffer.Unpooled;
+import lombok.Data;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.packets.ServerSidePacket;
+
+/**
+ * Данные чанка.
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD                    | TYPE         | NOTES                                                                              |
+ * |--------------------------|------------- |------------------------------------------------------------------------------------|
+ * | Chunk X                  | Integer      | Координаты чанка (координата блока, делённая на 16, округленная в меньшую сторону) |
+ * | Chunk Z                  | Integer      | Координаты чанка (координата блока, делённая на 16, округленная в меньшую сторону) |
+ * | Is Full chunk            | Boolean      | См. Chunk Format                                                                   |
+ * | Available Sections       | VarInt       | Битовая маска, где каждый бит - это часть чанка (0-15)                             |
+ * | Size of Data             | VarInt       | Размер поля "Data"                                                                 |
+ * | Data                     | Byte array   | Данные чанка. См. Chunk Format                                                     |
+ * | Number of block entities | VarInt       | Количество элементов в поле "Block entities"                                       |
+ * | Block entities           | Array of NBT | Все сущности в чанке                                                               |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Chunk_Data">Chunk Data</a>
+ * @see <a href="https://wiki.vg/index.php?title=Chunk_Format&oldid=14135">Chunk Format</a>
+ */
+@Data
+public class ChunkDataPacket implements ServerSidePacket {
+
+	private static NetByteBuf voidData;
+
+	private int x;
+	private int z;
+
+	@SuppressWarnings("java:S125")
+	@Override
+	public void writeSelf(NetByteBuf netByteBuf) {
+		netByteBuf.writeInt(x);
+		netByteBuf.writeInt(z);
+		/* Временное отключение кода
+		netByteBuf.writeBoolean(true); // Is Full chunk
+		netByteBuf.writeVarInt(0b11111111); // Available Sections
+
+		NetByteBuf data = new NetByteBuf(Unpooled.buffer());
+		// <Data>
+		for (int i = 0; i < 16; i++) {
+			NetByteBuf dataBuff = new NetByteBuf(Unpooled.wrappedBuffer(new byte[4096]));
+			NetByteBuf blockLight = new NetByteBuf(Unpooled.wrappedBuffer(new byte[2048]));
+			NetByteBuf skyLight = new NetByteBuf(Unpooled.wrappedBuffer(new byte[2048]));
+			NetByteBuf biomes = new NetByteBuf(Unpooled.wrappedBuffer(new byte[256]));
+
+			// <Chunk Section>
+			data.writeUnsignedByte(13); // Bits Per Block
+			//   <Palette>
+			data.writeUnsignedByte(0); // Palette Length (for direct)
+			//     <Palette Data/>
+			//   </Palette>
+			data.writeVarInt(dataBuff.readableBytes()); // Data Array Length
+			data.writeBytes(dataBuff); // Data Array
+			data.writeBytes(blockLight); // Block Light
+			data.writeBytes(skyLight); // Sky Light
+			// </Chunk Section>
+			data.writeBytes(biomes); // Biomes
+		}
+		// </Data>
+
+		netByteBuf.writeVarInt(data.readableBytes()); // Size of Data
+		netByteBuf.writeBytes(data); // Data
+		netByteBuf.writeVarInt(0); // Number of block entities
+		// write NBT's
+		 */
+
+		netByteBuf.writeBytes(voidData);
+
+		voidData.resetReaderIndex();
+		voidData.resetWriterIndex();
+	}
+
+	static {
+		voidData = new NetByteBuf(Unpooled.buffer());
+		voidData.writeBoolean(true); // Is Full chunk
+		voidData.writeVarInt(0b11111111); // Available Sections
+
+		NetByteBuf data = new NetByteBuf(Unpooled.buffer());
+		for (int i = 0; i < 16; i++) {
+			NetByteBuf dataBuff = new NetByteBuf(Unpooled.wrappedBuffer(new byte[4096]));
+			NetByteBuf blockLight = new NetByteBuf(Unpooled.wrappedBuffer(new byte[2048]));
+			NetByteBuf skyLight = new NetByteBuf(Unpooled.wrappedBuffer(new byte[2048]));
+			NetByteBuf biomes = new NetByteBuf(Unpooled.wrappedBuffer(new byte[256]));
+
+			data.writeUnsignedByte(13);
+			data.writeUnsignedByte(0);
+			data.writeVarInt(dataBuff.readableBytes());
+			data.writeBytes(dataBuff);
+			data.writeBytes(blockLight);
+			data.writeBytes(skyLight);
+			data.writeBytes(biomes);
+		}
+
+		voidData.writeVarInt(data.readableBytes());
+		voidData.writeBytes(data);
+		voidData.writeVarInt(0);
+
+		voidData.markReaderIndex();
+		voidData.markWriterIndex();
+	}
+}
--- a/protocol/src/main/java/mc/protocol/packets/play/server/JoinGamePacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/play/server/JoinGamePacket.java
@@ -0,0 +1,59 @@
+package mc.protocol.packets.play.server;
+
+import lombok.Data;
+import mc.protocol.utils.Difficulty;
+import mc.protocol.utils.GameMode;
+import mc.protocol.utils.LevelType;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.packets.ServerSidePacket;
+
+/**
+ * Join game packet.
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD              | TYPE          | NOTES                                                                |
+ * |--------------------|---------------|----------------------------------------------------------------------|
+ * | Entity ID          | Integer       | ID сущности (игрока)                                                 |
+ * | Gamemode           | Unsigned Byte | 0: Survival                                                          |
+ * |                    |               | 1: Creative                                                          |
+ * |                    |               | 2: Adventure                                                         |
+ * |                    |               | 3: Spectator                                                         |
+ * |                    |               | Bit 3 (0x8) is the hardcore flag.                                    |
+ * | Dimension          | Integer       | -1: Nether                                                           |
+ * |                    |               | 0: Overworld                                                         |
+ * |                    |               | 1: End                                                               |
+ * | Difficulty         | Unsigned Byte | 0: peaceful                                                          |
+ * |                    |               | 1: easy                                                              |
+ * |                    |               | 2: normal                                                            |
+ * |                    |               | 3: hard                                                              |
+ * | Max Players        | Unsigned Byte | Когда-то использовался клиентом для                                  |
+ * |                    |               | отображения списка игроков. Теперь не используется                   |
+ * | Level Type         | String (16)   | Принимает одно из значений:                                          |
+ * |                    |               | default, flat, largeBiomes, amplified, default_1_1                   |
+ * | Reduced Debug Info | Boolean       | Если true, то Клиент отображает меньше отладочной информации (в F3?) |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Join_Game">Join Game</a>
+ */
+@Data
+public class JoinGamePacket implements ServerSidePacket {
+
+	private int entityId;
+	private GameMode gameMode;
+	private int dimension;
+	private Difficulty difficulty;
+	private LevelType levelType;
+	private boolean reducedDebugInfo;
+
+	@Override
+	public void writeSelf(NetByteBuf netByteBuf) {
+		netByteBuf.writeInt(entityId);
+		netByteBuf.writeUnsignedByte(gameMode.getId());
+		netByteBuf.writeInt(dimension);
+		netByteBuf.writeUnsignedByte(difficulty.getId());
+		netByteBuf.writeUnsignedByte(0); // Max Players, unused
+		netByteBuf.writeString(levelType.getType());
+		netByteBuf.writeBoolean(reducedDebugInfo);
+	}
+}
--- a/protocol/src/main/java/mc/protocol/packets/play/server/PlayerAbilitiesPacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/play/server/PlayerAbilitiesPacket.java
@@ -0,0 +1,60 @@
+package mc.protocol.packets.play.server;
+
+import lombok.Data;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.packets.ServerSidePacket;
+
+/**
+ * Характеристики игрока.
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD                        | TYPE     | NOTES                                   |
+ * |------------------------------|----------|-----------------------------------------|
+ * | Flags                        | Byte     | Битовая маска флагов. См. ниже значения |
+ * | Flying Speed                 | Float    | Скорость полёта                         |
+ * | Field of View (FOV) Modifier | Float    | Поле зрения                             |
+ * </pre>
+ *
+ * <p>Флаги "Flags"</p>
+ * <pre>
+ * Bit 0x01 - Неуязвимость (Invulnerable)
+ * Bit 0x02 - В полёте (Flying)
+ * Bit 0x04 - Может летать (Allow Flying)
+ * Bit 0x08 - Creative Mode (Instant Break)
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Player_Abilities_.28clientbound.29">Player Abilities</a>
+ */
+@Data
+public class PlayerAbilitiesPacket implements ServerSidePacket {
+
+	@SuppressWarnings("java:S116")
+	private byte $flags = 0;
+	private float flyingSpeed;
+	private float fieldOfView;
+
+	@Override
+	public void writeSelf(NetByteBuf netByteBuf) {
+		netByteBuf.writeByte(this.$flags);
+		netByteBuf.writeFloat(this.flyingSpeed);
+		netByteBuf.writeFloat(this.fieldOfView);
+	}
+
+	//FIXME использование value значений
+	public void setInvulnerable(boolean value) {
+		this.$flags = (byte) (this.$flags | 0x01);
+	}
+
+	public void setFlying(boolean value) {
+		this.$flags = (byte) (this.$flags | 0x02);
+	}
+
+	public void setCatFly(boolean value) {
+		this.$flags = (byte) (this.$flags | 0x04);
+	}
+
+	public void setCreativeMode(boolean value) {
+		this.$flags = (byte) (this.$flags | 0x08);
+	}
+}
--- a/protocol/src/main/java/mc/protocol/packets/play/server/SPlayerPositionAndLookPacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/play/server/SPlayerPositionAndLookPacket.java
@@ -0,0 +1,83 @@
+package mc.protocol.packets.play.server;
+
+import lombok.Data;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.model.Location;
+import mc.protocol.model.Look;
+import mc.protocol.packets.ServerSidePacket;
+import mc.protocol.packets.play.client.TeleportConfirmPacket;
+
+/**
+ * Установка позиции и угла осмотра Игрока.
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD       | TYPE   | NOTES                                                                             |
+ * |-------------|--------|-----------------------------------------------------------------------------------|
+ * | X           | Double | Абсолютная или относительная позиция по X. Зависит от "Flags"                     |
+ * | Y           | Double | Абсолютная или относительная позиция по Y. Зависит от "Flags"                     |
+ * | Z           | Double | Абсолютная или относительная позиция по Z. Зависит от "Flags"                     |
+ * | Yaw         | Float  | Абсолютный или относительный поворот головы по OX, в градусах. Зависит от "Flags" |
+ * | Pitch       | Float  | Абсолютный или относительный поворот головы по OY, в градусах. Зависит от "Flags" |
+ * | Flags       | Byte   | Битовая маска значений флагов. См. значения ниже                                  |
+ * | Teleport ID | VarInt | ID для подтверждения клиентом перемещения Игрока                                  |
+ * </pre>
+ *
+ * <p>Значения "Flags"</p>
+ * <pre>
+ * | Field | Bit  |
+ * |-------|------|
+ * | X     | 0x01 |
+ * | Y     | 0x02 |
+ * | Z     | 0x04 |
+ * | X_ROT | 0x08 |
+ * | Y_ROT | 0x10 |
+ * </pre>
+ *
+ * <p>Примечание от Dinnerbone про "Flags":</p>
+ * <i>"It's a bitfield, X/Y/Z/Y_ROT/X_ROT. If X is set, the x value is relative and not absolute."</i>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Player_Position_And_Look_.28clientbound.29">Player Position And Look (clientbound)</a>
+ * @see TeleportConfirmPacket
+ */
+@Data
+public class SPlayerPositionAndLookPacket implements ServerSidePacket {
+
+	private Location position;
+	private Look look;
+	@SuppressWarnings("java:S116")
+	private byte $flags = 0;
+	private int teleportId;
+
+	@Override
+	public void writeSelf(NetByteBuf netByteBuf) {
+		netByteBuf.writeDouble(this.position.getX());
+		netByteBuf.writeDouble(this.position.getY());
+		netByteBuf.writeDouble(this.position.getZ());
+		netByteBuf.writeFloat(this.look.getYaw());
+		netByteBuf.writeFloat(this.look.getPitch());
+		netByteBuf.writeByte(this.$flags);
+		netByteBuf.writeVarInt(teleportId);
+	}
+
+	//FIXME использовать value значения
+	public void setFlagX(boolean value) {
+		this.$flags = (byte) (this.$flags | 0x01);
+	}
+
+	public void setFlagY(boolean value) {
+		this.$flags = (byte) (this.$flags | 0x02);
+	}
+
+	public void setFlagZ(boolean value) {
+		this.$flags = (byte) (this.$flags | 0x04);
+	}
+
+	public void setFlagXRot(boolean value) {
+		this.$flags = (byte) (this.$flags | 0x08);
+	}
+
+	public void setFlagYRot(boolean value) {
+		this.$flags = (byte) (this.$flags | 0x10);
+	}
+}
--- a/protocol/src/main/java/mc/protocol/packets/play/server/SpawnPositionPacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/play/server/SpawnPositionPacket.java
@@ -0,0 +1,41 @@
+package mc.protocol.packets.play.server;
+
+import lombok.Data;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.model.Location;
+import mc.protocol.packets.ServerSidePacket;
+
+/**
+ * Спавн позиция игрока.
+ *
+ * <p>Используется призаходе игрока на сервер.</p>
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD    | TYPE     | NOTES                 |
+ * |----------|----------|-----------------------|
+ * | Location | Position | Локация спавна игрока |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Spawn_Position">Spawn Position</a>
+ */
+@Data
+public class SpawnPositionPacket implements ServerSidePacket {
+
+	private Location spawn;
+
+	@Override
+	public void writeSelf(NetByteBuf netByteBuf) {
+		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;
+	}
+
+}
--- a/protocol/src/main/java/mc/protocol/packets/status/client/StatusServerRequestPacket.java
+++ b/protocol/src/main/java/mc/protocol/packets/status/client/StatusServerRequestPacket.java
@@ -0,0 +1,34 @@
+package mc.protocol.packets.status.client;
+
+import lombok.EqualsAndHashCode;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.packets.ClientSidePacket;
+import mc.protocol.packets.ServerSidePacket;
+
+/**
+ * Status server packet, request.
+ *
+ * <p>Клиент запрашивает получение информации о сервере</p>
+ */
+@NoArgsConstructor
+@EqualsAndHashCode(callSuper = false)
+@ToString
+public class StatusServerRequestPacket implements ClientSidePacket, ServerSidePacket {
+
+	@Override
+	public void readSelf(NetByteBuf netByteBuf) {
+		// empty
+	}
+
+	@Override
+	public void writeSelf(NetByteBuf netByteBuf) {
+		// empty
+	}
+
+	@Override
+	public void passivate() {
+		// pass
+	}
+}
--- a/protocol/src/main/java/mc/protocol/packets/status/server/StatusServerResponse.java
+++ b/protocol/src/main/java/mc/protocol/packets/status/server/StatusServerResponse.java
@@ -0,0 +1,59 @@
+package mc.protocol.packets.status.server;
+
+import lombok.Data;
+import mc.protocol.buffer.NetByteBuf;
+import mc.protocol.packets.ServerSidePacket;
+
+/**
+ * Status server packet, response.
+ *
+ * <p>Информация о сервере</p>
+ *
+ * <p>Структура пакета
+ * <pre>
+ * | FIELD         | TYPE   | NOTES                                   |
+ * |---------------|--------|-----------------------------------------|
+ * | JSON Response | String | Информация о сервере в JSON формате [1] |
+ *
+ * [1] - <a href="https://wiki.vg/index.php?title=Server_List_Ping&oldid=7555#Response" target="_top">Server List Ping: Response</a>
+ * </pre>
+ *
+ * <p>Пример JSON Response</p>
+ * <pre>
+ * {
+ *     "version": {
+ *         "name": "1.8.7",
+ *         "protocol": 47
+ *     },
+ *     "players": {
+ *         "max": 100,
+ *         "online": 5,
+ *         "sample": [
+ *             {
+ *                 "name": "thinkofdeath",
+ *                 "id": "4566e69f-c907-48ee-8d71-d7ba5aa00d20"
+ *             }
+ *         ]
+ *     },
+ *     "description": {
+ *         "text": "Hello world"
+ *     },
+ *     "favicon": "data:image/png;base64,&lt;data&gt;"
+ * }
+ * </pre>
+ *
+ * <p><code>`$.favicon`</code> должен быть формата PNG и размеры 64x64 px</p>
+ */
+@Data
+public class StatusServerResponse implements ServerSidePacket {
+
+	/**
+	 * Информация о серере.
+	 */
+	private String info;
+
+	@Override
+	public void writeSelf(NetByteBuf netByteBuf) {
+		netByteBuf.writeString(info);
+	}
+}
--- a/protocol/src/main/java/mc/protocol/pool/LocationObjectPool.java
+++ b/protocol/src/main/java/mc/protocol/pool/LocationObjectPool.java
@@ -0,0 +1,37 @@
+package mc.protocol.pool;
+
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+import lombok.SneakyThrows;
+import mc.protocol.model.Location;
+import org.apache.commons.pool2.BasePooledObjectFactory;
+import org.apache.commons.pool2.ObjectPool;
+import org.apache.commons.pool2.PooledObject;
+import org.apache.commons.pool2.impl.DefaultPooledObject;
+import org.apache.commons.pool2.impl.GenericObjectPool;
+
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public class LocationObjectPool extends BasePooledObjectFactory<Location> {
+
+	private static final ObjectPool<Location> instance = new GenericObjectPool<>(new LocationObjectPool());
+
+	@Override
+	public Location create() {
+		return new Location();
+	}
+
+	@Override
+	public PooledObject<Location> wrap(Location location) {
+		return new DefaultPooledObject<>(location);
+	}
+
+	@SneakyThrows
+	public static Location borrowObject() {
+		return instance.borrowObject();
+	}
+
+	@SneakyThrows
+	public static void returnObject(Location location) {
+		instance.returnObject(location);
+	}
+}
--- a/protocol/src/main/java/mc/protocol/pool/LookObjectPool.java
+++ b/protocol/src/main/java/mc/protocol/pool/LookObjectPool.java
@@ -0,0 +1,37 @@
+package mc.protocol.pool;
+
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+import lombok.SneakyThrows;
+import mc.protocol.model.Look;
+import org.apache.commons.pool2.BasePooledObjectFactory;
+import org.apache.commons.pool2.ObjectPool;
+import org.apache.commons.pool2.PooledObject;
+import org.apache.commons.pool2.impl.DefaultPooledObject;
+import org.apache.commons.pool2.impl.GenericObjectPool;
+
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public class LookObjectPool extends BasePooledObjectFactory<Look> {
+
+	private static final ObjectPool<Look> instance = new GenericObjectPool<>(new LookObjectPool());
+
+	@Override
+	public Look create() {
+		return new Look();
+	}
+
+	@Override
+	public PooledObject<Look> wrap(Look look) {
+		return new DefaultPooledObject<>(look);
+	}
+
+	@SneakyThrows
+	public static Look borrowObject() {
+		return instance.borrowObject();
+	}
+
+	@SneakyThrows
+	public static void returnObject(Look look) {
+		instance.returnObject(look);
+	}
+}
--- a/protocol/src/main/java/mc/protocol/pool/PacketObjectPool.java
+++ b/protocol/src/main/java/mc/protocol/pool/PacketObjectPool.java
@@ -0,0 +1,14 @@
+package mc.protocol.pool;
+
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import mc.protocol.packets.ClientSidePacket;
+import mc.utils.pool.WideClassObjectPool;
+
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public class PacketObjectPool extends WideClassObjectPool<ClientSidePacket> {
+
+	@Getter
+	private static final PacketObjectPool instance = new PacketObjectPool();
+}
--- a/protocol/src/main/java/mc/protocol/utils/ChatMode.java
+++ b/protocol/src/main/java/mc/protocol/utils/ChatMode.java
@@ -0,0 +1,20 @@
+package mc.protocol.utils;
+
+import javax.annotation.Nullable;
+
+public enum ChatMode {
+	FULL,
+	COMMANDS_ONLY,
+	HIDDEN;
+
+	@Nullable
+	public static ChatMode valueById(int id) {
+		// а зачем усложнять?
+		//@formatter:off
+		if      (id == 1) return FULL;
+		else if (id == 2) return COMMANDS_ONLY;
+		else if (id == 3) return HIDDEN;
+		else              return null;
+		//@formatter:on
+	}
+}
--- a/protocol/src/main/java/mc/protocol/utils/Difficulty.java
+++ b/protocol/src/main/java/mc/protocol/utils/Difficulty.java
@@ -0,0 +1,15 @@
+package mc.protocol.utils;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+@Getter
+public enum Difficulty {
+	PEACEFUL(0),
+	EASY(1),
+	NORMAL(2),
+	HARD(3);
+
+	private final int id;
+}
--- a/protocol/src/main/java/mc/protocol/utils/GameMode.java
+++ b/protocol/src/main/java/mc/protocol/utils/GameMode.java
@@ -0,0 +1,15 @@
+package mc.protocol.utils;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+@Getter
+public enum GameMode {
+	SURVIVAL(0),
+	CREATIVE(1),
+	ADVENTURE(2),
+	SPECTATOR(3);
+
+	private final int id;
+}
--- a/protocol/src/main/java/mc/protocol/utils/LevelType.java
+++ b/protocol/src/main/java/mc/protocol/utils/LevelType.java
@@ -0,0 +1,16 @@
+package mc.protocol.utils;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+@Getter
+public enum LevelType {
+	DEFAULT_TYPE("default"),
+	FLAT("flat"),
+	LARGE_BIOMES("largeBiomes"),
+	AMPLIFIED("amplified"),
+	DEFAULT_1_1("default_1_1");
+
+	private final String type;
+}
--- a/protocol/src/main/java/mc/protocol/utils/MainHand.java
+++ b/protocol/src/main/java/mc/protocol/utils/MainHand.java
@@ -0,0 +1,18 @@
+package mc.protocol.utils;
+
+import javax.annotation.Nullable;
+
+public enum MainHand {
+	LEFT,
+	RIGHT;
+
+	@Nullable
+	public static MainHand valueById(int id) {
+		// а зачем усложнять?
+		//@formatter:off
+		if      (id == 0) return LEFT;
+		else if (id == 1) return RIGHT;
+		else              return null;
+		//@formatter:on
+	}
+}
--- a/protocol/src/main/java/mc/protocol/utils/Table.java
+++ b/protocol/src/main/java/mc/protocol/utils/Table.java
@@ -0,0 +1,23 @@
+package mc.protocol.utils;
+
+import javax.annotation.Nullable;
+import java.util.HashMap;
+import java.util.Map;
+
+public class Table<C, R, V> {
+
+	private final Map<C, Map<R, V>> map = new HashMap<>();
+
+	@Nullable
+	public V getColumnAndRow(C column, R row) {
+		if (!map.containsKey(column)) {
+			return null;
+		}
+
+		return map.get(column).get(row);
+	}
+
+	public void put(C column, R row, V value) {
+		map.computeIfAbsent(column, c -> new HashMap<>()).put(row, value);
+	}
+}
--- a/protocol/src/main/java/mc/protocol/world/Chunk.java
+++ b/protocol/src/main/java/mc/protocol/world/Chunk.java
@@ -0,0 +1,7 @@
+package mc.protocol.world;
+
+public interface Chunk {
+
+	int getX();
+	int getZ();
+}
--- a/protocol/src/main/java/mc/protocol/world/World.java
+++ b/protocol/src/main/java/mc/protocol/world/World.java
@@ -0,0 +1,13 @@
+package mc.protocol.world;
+
+import mc.protocol.model.Location;
+import mc.protocol.utils.LevelType;
+
+public interface World {
+
+	LevelType getLevelType();
+
+	Location getSpawn();
+
+	Chunk getChunk(int x, int z);
+}
--- a/protocol/src/test/java/mc/protocol/buffer/NetByteBufReadTest.java
+++ b/protocol/src/test/java/mc/protocol/buffer/NetByteBufReadTest.java
@@ -0,0 +1,305 @@
+package mc.protocol.buffer;
+
+import io.netty.buffer.Unpooled;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.util.Random;
+import java.util.UUID;
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class NetByteBufReadTest {
+
+	private static Random random;
+	private ByteArrayOutputStream baos;
+
+	@BeforeEach
+	void setUp() {
+		random = new Random(System.currentTimeMillis());
+		baos = new ByteArrayOutputStream();
+	}
+
+	@ParameterizedTest
+	@MethodSource("paramsReadBoolean")
+	void readBoolean(byte sourceByte, boolean expectedValue) {
+		baos.write(sourceByte);
+
+		NetByteBuf netByteBuf = new NetByteBuf(Unpooled.wrappedBuffer(baos.toByteArray()));
+
+		assertEquals(expectedValue, netByteBuf.readBoolean());
+	}
+
+	@Test
+	void readByte() {
+		byte[] bytes = new byte[1];
+		random.nextBytes(bytes);
+		baos.write(bytes[0]);
+
+		NetByteBuf netByteBuf = new NetByteBuf(Unpooled.wrappedBuffer(baos.toByteArray()));
+
+		assertEquals(bytes[0], netByteBuf.readByte());
+	}
+
+	@ParameterizedTest
+	@MethodSource("paramsReadUnsignedByte")
+	void readUnsignedByte(byte sourceByte, int expectedValue) {
+		baos.write(sourceByte);
+
+		NetByteBuf netByteBuf = new NetByteBuf(Unpooled.wrappedBuffer(baos.toByteArray()));
+
+		assertEquals(expectedValue, netByteBuf.readUnsignedByte());
+	}
+
+	@Test
+	void readShort() throws IOException {
+		int value = Integer.valueOf(random.nextInt()).shortValue();
+		new DataOutputStream(baos).writeShort(value);
+
+		NetByteBuf netByteBuf = new NetByteBuf(Unpooled.wrappedBuffer(baos.toByteArray()));
+
+		assertEquals(value, netByteBuf.readShort());
+	}
+
+	@Test
+	void readUnsignedShort() throws IOException {
+		int value = 32768;
+		new DataOutputStream(baos).writeShort(value);
+
+		NetByteBuf netByteBuf = new NetByteBuf(Unpooled.wrappedBuffer(baos.toByteArray()));
+
+		assertEquals(value, netByteBuf.readUnsignedShort());
+	}
+
+	@ParameterizedTest
+	@MethodSource("paramsReadString")
+	void readString(String string) throws IOException {
+		final byte[] strBytes = string.getBytes(StandardCharsets.UTF_8);
+		final byte[] bytes = new byte[strBytes.length + 1];
+		bytes[0] = (byte) string.codePoints().count(); // допустим, что размер поместился в один байт
+		System.arraycopy(strBytes, 0, bytes, 1, strBytes.length);
+
+		baos.write(bytes);
+
+		NetByteBuf netByteBuf = new NetByteBuf(Unpooled.wrappedBuffer(baos.toByteArray()));
+
+		assertEquals(string, netByteBuf.readString());
+	}
+
+	@Test
+	void readString_overSize() throws IOException {
+		String string = "123";
+		final byte[] strBytes = string.getBytes(StandardCharsets.UTF_8);
+		final byte[] bytes = new byte[strBytes.length + 1];
+		final int length = string.length();
+		bytes[0] = (byte) (length + 1); // допустим, что размер поместился в один байт
+		System.arraycopy(strBytes, 0, bytes, 1, strBytes.length);
+
+		baos.write(bytes);
+
+		NetByteBuf netByteBuf = new NetByteBuf(Unpooled.wrappedBuffer(baos.toByteArray()));
+
+		assertThrows(NetIOException.class, () -> netByteBuf.readString(length));
+	}
+
+	@Test
+	void readString_lessZero() throws IOException {
+		String string = "123";
+		final byte[] strBytes = string.getBytes(StandardCharsets.UTF_8);
+		final byte[] bytes = new byte[strBytes.length + 5];
+		bytes[0] = (byte) 0xFF;
+		bytes[1] = (byte) 0xFF;
+		bytes[2] = (byte) 0xFF;
+		bytes[3] = (byte) 0xFF;
+		bytes[4] = (byte) 0x0F;
+		System.arraycopy(strBytes, 0, bytes, 5, strBytes.length);
+
+		baos.write(bytes);
+
+		NetByteBuf netByteBuf = new NetByteBuf(Unpooled.wrappedBuffer(baos.toByteArray()));
+
+		assertThrows(NetIOException.class, () -> netByteBuf.readString(-1));
+	}
+
+	@ParameterizedTest
+	@MethodSource("paramsReadVarInt")
+	void readVarInt(byte[] sourceBytes, int expectedValue) throws IOException {
+		baos.write(sourceBytes);
+
+		NetByteBuf netByteBuf = new NetByteBuf(Unpooled.wrappedBuffer(baos.toByteArray()));
+
+		assertEquals(expectedValue, netByteBuf.readVarInt());
+	}
+
+	@Test
+	void readVarInt_tooBig() throws IOException {
+		baos.write(new byte[]{ (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0x0F });
+
+		NetByteBuf netByteBuf = new NetByteBuf(Unpooled.wrappedBuffer(baos.toByteArray()));
+
+		assertEquals(-1, netByteBuf.readVarInt());
+	}
+
+	@ParameterizedTest
+	@MethodSource({"paramsReadVarInt", "paramsReadVarLong"})
+	void readVarLong(byte[] sourceBytes, long expectedValue) throws IOException {
+		baos.write(sourceBytes);
+
+		NetByteBuf netByteBuf = new NetByteBuf(Unpooled.wrappedBuffer(baos.toByteArray()));
+
+		assertEquals(expectedValue, netByteBuf.readVarLong());
+	}
+
+	@Test
+	void readVarLong_tooBig() throws IOException {
+		baos.write(new byte[]{ (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF,
+				(byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF,
+				(byte) 0xFF, (byte) 0x0F });
+
+		NetByteBuf netByteBuf = new NetByteBuf(Unpooled.wrappedBuffer(baos.toByteArray()));
+
+		assertEquals(-1, netByteBuf.readVarLong());
+	}
+
+	@Test
+	void readUUID() throws IOException {
+		final UUID uuid = UUID.randomUUID();
+		final long mostSignificantBits = uuid.getMostSignificantBits();
+		final long leastSignificantBits = uuid.getLeastSignificantBits();
+
+		baos.write(new byte[]{
+				(byte) ((mostSignificantBits >>> 56) & 0xFF),
+				(byte) ((mostSignificantBits >>> 48) & 0xFF),
+				(byte) ((mostSignificantBits >>> 40) & 0xFF),
+				(byte) ((mostSignificantBits >>> 32) & 0xFF),
+				(byte) ((mostSignificantBits >>> 24) & 0xFF),
+				(byte) ((mostSignificantBits >>> 16) & 0xFF),
+				(byte) ((mostSignificantBits >>> 8) & 0xFF),
+				(byte) (mostSignificantBits & 0xFF)
+		});
+		baos.write(new byte[]{
+				(byte) ((leastSignificantBits >>> 56) & 0xFF),
+				(byte) ((leastSignificantBits >>> 48) & 0xFF),
+				(byte) ((leastSignificantBits >>> 40) & 0xFF),
+				(byte) ((leastSignificantBits >>> 32) & 0xFF),
+				(byte) ((leastSignificantBits >>> 24) & 0xFF),
+				(byte) ((leastSignificantBits >>> 16) & 0xFF),
+				(byte) ((leastSignificantBits >>> 8) & 0xFF),
+				(byte) (leastSignificantBits & 0xFF)
+		});
+
+		NetByteBuf netByteBuf = new NetByteBuf(Unpooled.wrappedBuffer(baos.toByteArray()));
+
+		assertEquals(uuid, netByteBuf.readUUID());
+	}
+
+	@Test
+	void readBytes() throws IOException {
+		byte[] bytes = new byte[128];
+		random.nextBytes(bytes);
+		baos.write(bytes);
+
+		byte[] actualBytes = new byte[128];
+		NetByteBuf netByteBuf = new NetByteBuf(Unpooled.wrappedBuffer(baos.toByteArray()));
+
+		assertEquals(bytes.length, netByteBuf.readableBytes());
+
+		netByteBuf.readBytes(actualBytes);
+
+		assertArrayEquals(bytes, actualBytes);
+		assertEquals(0, netByteBuf.readableBytes());
+	}
+
+	@Test
+	void read_offset() throws IOException {
+		byte[] bytes = new byte[128];
+		random.nextBytes(bytes);
+		baos.write(bytes);
+
+		byte[] buff = new byte[128];
+		NetByteBuf netByteBuf = new NetByteBuf(Unpooled.wrappedBuffer(baos.toByteArray()));
+		netByteBuf.readBytes(buff, 3, 11);
+
+		byte[] expectedBytes = new byte[11];
+		System.arraycopy(bytes, 0, expectedBytes, 0, 11);
+		byte[] actualBytes = new byte[11];
+		System.arraycopy(buff, 3, actualBytes, 0, 11);
+
+		assertArrayEquals(expectedBytes, actualBytes);
+	}
+
+	@SuppressWarnings("unused")
+	private static Stream<Arguments> paramsReadBoolean() {
+		return Stream.of(
+				Arguments.of((byte) 0x00, false),
+				Arguments.of((byte) 0x01, true)
+		);
+	}
+
+	@SuppressWarnings("unused")
+	private static Stream<Arguments> paramsReadUnsignedByte() {
+		return Stream.of(
+				Arguments.of((byte) 30, 30),
+				Arguments.of((byte) (0xFF & 130), 130)
+		);
+	}
+
+	@SuppressWarnings("unused")
+	private static Stream<Arguments> paramsReadString() {
+		return Stream.of(
+				Arguments.of(""),
+				Arguments.of("Latin"),
+				Arguments.of("Кириллица"),
+				Arguments.of("العربية"),
+				Arguments.of("ﬦﬣﬡ"), // Алфавитные формы представления
+				Arguments.of("\uD800\uDD07") // Эгейские цифры, [один]
+		);
+	}
+
+	@SuppressWarnings("unused")
+	private static Stream<Arguments> paramsReadVarInt() {
+		return Stream.of(
+				Arguments.of(new byte[]{ 0x78 }, 120),
+				Arguments.of(new byte[]{ (byte) 0xE0, 0x5D }, 12000),
+				Arguments.of(new byte[]{ (byte) 0xC0, (byte) 0xA9, 0x07 }, 120000),
+				Arguments.of(new byte[]{ (byte) 0x80, (byte) 0x9C, (byte) 0x9C, (byte) 0x39 }, 120_000_000),
+				Arguments.of(new byte[]{ (byte) 0x80, (byte) 0x98, (byte) 0x9A, (byte) 0xBC, 0x04 }, 1_200_000_000)
+		);
+	}
+
+	@SuppressWarnings("unused")
+	private static Stream<Arguments> paramsReadVarLong() {
+		return Stream.of(
+				Arguments.of(
+						new byte[]{ (byte) 0x80, (byte) 0xF0, (byte) 0x85, (byte) 0xDA, 0x2C },
+						12_000_000_000L),
+				Arguments.of(
+						new byte[]{ (byte) 0x80, (byte) 0xE0, (byte) 0xBA, (byte) 0x84, (byte) 0xBF, 0x03 },
+						120_000_000_000L),
+				Arguments.of(
+						new byte[]{ (byte) 0x80, (byte) 0x80, (byte) 0xF3, (byte) 0xBD, (byte) 0x9F, (byte) 0xDD,
+								0x02 },
+						12_000_000_000_000L),
+				Arguments.of(
+						new byte[]{ (byte) 0x80, (byte) 0x80, (byte) 0xEC, (byte) 0xAD, (byte) 0xCC, (byte) 0xEC,
+								(byte) 0x90, 0x02},
+						1_200_000_000_000_000L),
+				Arguments.of(
+						new byte[]{ (byte) 0x80, (byte) 0x80, (byte) 0xB0, (byte) 0xE8, (byte) 0xD3, (byte) 0xEB,
+								(byte) 0x94, (byte) 0xD5, 0x01 },
+						120_000_000_000_000_000L),
+				Arguments.of(
+						new byte[]{ (byte) 0x80, (byte) 0x80, (byte) 0x80, (byte) 0x80, (byte) 0x80, (byte) 0x80,
+								(byte) 0x80, (byte) 0x80, (byte) 0x80, 0x01 },
+						Long.MIN_VALUE)
+		);
+	}
+}
--- a/protocol/src/test/java/mc/protocol/buffer/NetByteBufWriteTest.java
+++ b/protocol/src/test/java/mc/protocol/buffer/NetByteBufWriteTest.java
@@ -0,0 +1,260 @@
+package mc.protocol.buffer;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import org.apache.commons.lang3.RandomStringUtils;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Random;
+import java.util.UUID;
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class NetByteBufWriteTest {
+
+	private static Random random;
+
+	@BeforeAll
+	static void setUp() {
+		random = new Random(System.currentTimeMillis());
+	}
+
+	@ParameterizedTest
+	@MethodSource("paramsWriteBoolean")
+	void writeBoolean(boolean sourceValue, byte expectedByte) {
+		ByteBuf byteBuf = Unpooled.buffer();
+		NetByteBuf netByteBuf = new NetByteBuf(byteBuf);
+
+		netByteBuf.writeBoolean(sourceValue);
+
+		assertEquals(expectedByte, byteBuf.array()[0]);
+	}
+
+	@ParameterizedTest
+	@MethodSource("paramsWriteByte")
+	void writeByte(byte sourceValue, byte expectedByte) {
+		ByteBuf byteBuf = Unpooled.buffer();
+		NetByteBuf netByteBuf = new NetByteBuf(byteBuf);
+
+		netByteBuf.writeByte(sourceValue);
+
+		assertEquals(expectedByte, byteBuf.array()[0]);
+	}
+
+	@Test
+	void writeUnsignedByte() {
+		ByteBuf byteBuf = Unpooled.buffer();
+		NetByteBuf netByteBuf = new NetByteBuf(byteBuf);
+
+		netByteBuf.writeUnsignedByte(129);
+
+		assertEquals(129, netByteBuf.readUnsignedByte());
+	}
+
+	@ParameterizedTest
+	@MethodSource("paramsWriteString")
+	void writeString(String string, int exceptedLength) {
+		ByteBuf byteBuf = Unpooled.buffer();
+		NetByteBuf netByteBuf = new NetByteBuf(byteBuf);
+
+		netByteBuf.writeString(string);
+
+		byte[] actualArray = netByteBuf.copy(0, netByteBuf.readableBytes()).array();
+		int actualLength = actualArray[0]; // допустим, что размер поместился в один байт
+		assertEquals(exceptedLength, actualLength);
+
+		byte[] dataBytes = new byte[actualArray.length - 1];
+		System.arraycopy(actualArray, 1, dataBytes, 0, dataBytes.length);
+		assertEquals(string, new String(dataBytes, StandardCharsets.UTF_8));
+	}
+
+	//возможно этот тест нужно перенести в NetByteBufReadTest
+	@Test
+	void writeString_overSize() {
+		String overSizeString = RandomStringUtils.randomAscii(Short.MAX_VALUE + Short.MAX_VALUE);
+
+		ByteBuf byteBuf = Unpooled.buffer();
+		NetByteBuf netByteBuf = new NetByteBuf(byteBuf);
+
+		netByteBuf.writeString(overSizeString);
+
+		NetByteBuf netByteBuf2 = new NetByteBuf(byteBuf.copy());
+		String actualString = netByteBuf2.readString();
+
+		String expectedString = overSizeString.substring(0, Short.MAX_VALUE);
+
+		assertEquals(expectedString, actualString);
+	}
+
+	@ParameterizedTest
+	@MethodSource("paramsWriteVarInt")
+	void writeVarInt(int sourceValue, byte[] expectedBytes) {
+		ByteBuf byteBuf = Unpooled.buffer();
+		NetByteBuf netByteBuf = new NetByteBuf(byteBuf);
+
+		netByteBuf.writeVarInt(sourceValue);
+		byte[] actualArray = netByteBuf.copy(0, netByteBuf.readableBytes()).array();
+
+		assertArrayEquals(expectedBytes, actualArray);
+	}
+
+	@ParameterizedTest
+	@MethodSource({ "paramsWriteVarInt", "paramsWriteVarLong" })
+	void writeVarLong(long sourceValue, byte[] expectedBytes) {
+		ByteBuf byteBuf = Unpooled.buffer();
+		NetByteBuf netByteBuf = new NetByteBuf(byteBuf);
+
+		netByteBuf.writeVarLong(sourceValue);
+		byte[] actualArray = netByteBuf.copy(0, netByteBuf.readableBytes()).array();
+
+		assertArrayEquals(expectedBytes, actualArray);
+	}
+
+	@Test
+	void writeUUID() {
+		final UUID uuid = UUID.randomUUID();
+
+		ByteBuf byteBuf = Unpooled.buffer();
+		NetByteBuf netByteBuf = new NetByteBuf(byteBuf);
+
+		netByteBuf.writeUUID(uuid);
+
+		final long mostSignificantBits = uuid.getMostSignificantBits();
+		final long leastSignificantBits = uuid.getLeastSignificantBits();
+
+		byte[] actualArray = netByteBuf.copy(0, netByteBuf.readableBytes()).array();
+
+		assertArrayEquals(new byte[]{
+						(byte) ((mostSignificantBits >>> 56) & 0xFF),
+						(byte) ((mostSignificantBits >>> 48) & 0xFF),
+						(byte) ((mostSignificantBits >>> 40) & 0xFF),
+						(byte) ((mostSignificantBits >>> 32) & 0xFF),
+						(byte) ((mostSignificantBits >>> 24) & 0xFF),
+						(byte) ((mostSignificantBits >>> 16) & 0xFF),
+						(byte) ((mostSignificantBits >>> 8) & 0xFF),
+						(byte) (mostSignificantBits & 0xFF),
+
+						(byte) ((leastSignificantBits >>> 56) & 0xFF),
+						(byte) ((leastSignificantBits >>> 48) & 0xFF),
+						(byte) ((leastSignificantBits >>> 40) & 0xFF),
+						(byte) ((leastSignificantBits >>> 32) & 0xFF),
+						(byte) ((leastSignificantBits >>> 24) & 0xFF),
+						(byte) ((leastSignificantBits >>> 16) & 0xFF),
+						(byte) ((leastSignificantBits >>> 8) & 0xFF),
+						(byte) (leastSignificantBits & 0xFF) },
+				actualArray);
+	}
+
+	@Test
+	void writeBytes() {
+		byte[] bytes = new byte[128];
+		random.nextBytes(bytes);
+
+		ByteBuf byteBuf = Unpooled.buffer();
+		NetByteBuf netByteBuf = new NetByteBuf(byteBuf);
+
+		netByteBuf.writeBytes(bytes);
+		byte[] actualArray = netByteBuf.copy(0, netByteBuf.readableBytes()).array();
+
+		assertArrayEquals(bytes, actualArray);
+	}
+
+	@Test
+	void write_offset() {
+		byte[] bytes = new byte[128];
+		random.nextBytes(bytes);
+
+		ByteBuf byteBuf = Unpooled.buffer();
+		NetByteBuf netByteBuf = new NetByteBuf(byteBuf);
+
+		netByteBuf.writeBytes(bytes, 3, 11);
+
+		byte[] actualBytes = new byte[11];
+		System.arraycopy(byteBuf.array(), 0, actualBytes, 0, 11);
+
+		byte[] expectedBytes = new byte[11];
+		System.arraycopy(bytes, 3, expectedBytes, 0, 11);
+
+		assertArrayEquals(expectedBytes, actualBytes);
+	}
+
+	@SuppressWarnings("unused")
+	private static Stream<Arguments> paramsWriteBoolean() {
+		return Stream.of(
+				Arguments.of(false, (byte) 0x00),
+				Arguments.of(true, (byte) 0x01)
+		);
+	}
+
+	@SuppressWarnings("unused")
+	private static Stream<Arguments> paramsWriteByte() {
+		byte b = Integer.valueOf(random.nextInt()).byteValue();
+
+		return Stream.of(
+				Arguments.of(b, b),
+				Arguments.of((byte) 128, (byte) -128)
+		);
+	}
+
+	@SuppressWarnings("unused")
+	private static Stream<Arguments> paramsWriteString() {
+		return Stream.of(
+				Arguments.of("", 0),
+				Arguments.of("Latin", 5),
+				Arguments.of("Кириллица", 37),
+				// (9) -> "РљРёСЂРёР»Р»РёС†Р°"(18) => 18*2=36 (37?)
+				Arguments.of("العربية", 30),
+				// (7) -> "Ш§Щ„Ш№Ш±ШЁЩЉШ©"(14) => 14*2=28 (30?)
+				Arguments.of("ﬦﬣﬡ", 18), // Алфавитные формы представления
+				// (3) -> "п¬¦п¬Јп¬Ў"(9) => 9*2=18
+				Arguments.of("\uD800\uDD07", 4) // Эгейские цифры, [один]
+				// (1) -> "𐄇" => ...4!
+		);
+	}
+
+	@SuppressWarnings("unused")
+	private static Stream<Arguments> paramsWriteVarInt() {
+		return Stream.of(
+				Arguments.of(120, new byte[]{ 0x78 }),
+				Arguments.of(12000, new byte[]{ (byte) 0xE0, 0x5D }),
+				Arguments.of(120000, new byte[]{ (byte) 0xC0, (byte) 0xA9, 0x07 }),
+				Arguments.of(120000000, new byte[]{ (byte) 0x80, (byte) 0x9C, (byte) 0x9C, (byte) 0x39 }),
+				Arguments.of(1200000000, new byte[]{ (byte) 0x80, (byte) 0x98, (byte) 0x9A, (byte) 0xBC, 0x04 })
+		);
+	}
+
+	@SuppressWarnings("unused")
+	private static Stream<Arguments> paramsWriteVarLong() {
+		return Stream.of(
+				Arguments.of(
+						12_000_000_000L,
+						new byte[]{ (byte) 0x80, (byte) 0xF0, (byte) 0x85, (byte) 0xDA, 0x2C }),
+				Arguments.of(
+						120_000_000_000L,
+						new byte[]{ (byte) 0x80, (byte) 0xE0, (byte) 0xBA, (byte) 0x84, (byte) 0xBF, 0x03 }),
+				Arguments.of(
+						12_000_000_000_000L,
+						new byte[]{ (byte) 0x80, (byte) 0x80, (byte) 0xF3, (byte) 0xBD, (byte) 0x9F, (byte) 0xDD,
+								0x02 }),
+				Arguments.of(
+						1_200_000_000_000_000L,
+						new byte[]{ (byte) 0x80, (byte) 0x80, (byte) 0xEC, (byte) 0xAD, (byte) 0xCC, (byte) 0xEC,
+								(byte) 0x90, 0x02 }),
+				Arguments.of(
+						120_000_000_000_000_000L,
+						new byte[]{ (byte) 0x80, (byte) 0x80, (byte) 0xB0, (byte) 0xE8, (byte) 0xD3, (byte) 0xEB,
+								(byte) 0x94, (byte) 0xD5, 0x01 }),
+				Arguments.of(
+						Long.MIN_VALUE,
+						new byte[]{ (byte) 0x80, (byte) 0x80, (byte) 0x80, (byte) 0x80, (byte) 0x80, (byte) 0x80,
+								(byte) 0x80, (byte) 0x80, (byte) 0x80, 0x01 })
+		);
+	}
+}
--- a/protocol/src/test/java/mc/protocol/handler/codec/ProtocolSplitterTest.java
+++ b/protocol/src/test/java/mc/protocol/handler/codec/ProtocolSplitterTest.java
@@ -0,0 +1,59 @@
+package mc.protocol.handler.codec;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ProtocolSplitterTest {
+
+	byte[] expectedPacket1Bytes;
+	byte[] expectedPacket2Bytes;
+	byte[] bytes;
+
+	@Test
+	void split() {
+		prepare();
+
+		ByteBuf inputBuffer = Unpooled.wrappedBuffer(bytes);
+		List<Object> outputObject = new ArrayList<>();
+
+		ProtocolSplitter protocolSplitter = new ProtocolSplitter();
+		protocolSplitter.decode(null, inputBuffer, outputObject);
+
+		assertEquals(2, outputObject.size());
+		assertTrue(outputObject.get(0) instanceof ByteBuf);
+		assertArrayEquals(expectedPacket1Bytes, ((ByteBuf)outputObject.get(0)).array());
+		assertTrue(outputObject.get(1) instanceof ByteBuf);
+		assertArrayEquals(expectedPacket2Bytes, ((ByteBuf)outputObject.get(1)).array());
+	}
+
+	private void prepare() {
+		/*
+				 +-------------------------------------------------+
+				 |  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |
+		+--------+-------------------------------------------------+----------------+
+		|00000000| 10 00 d4 02 09 31 32 37 2e 30 2e 30 2e 31 63 dd |.....127.0.0.1c.|
+		|00000010| 01 01 00                                        |...             |
+		+--------+-------------------------------------------------+----------------+
+		 */
+		expectedPacket1Bytes = new byte[]{
+				0x00, (byte) 0xd4, 0x02, 0x09, 0x31, 0x32, 0x37, 0x2e, 0x30, 0x2e, 0x30, 0x2e, 0x31, 0x63,
+				(byte) 0xdd, 0x01
+		};
+		expectedPacket2Bytes = new byte[]{
+				0x00
+		};
+		bytes = new byte[2 + expectedPacket1Bytes.length + expectedPacket2Bytes.length];
+		bytes[0] = 0x10;
+		System.arraycopy(expectedPacket1Bytes, 0,
+				bytes, 1, expectedPacket1Bytes.length);
+		bytes[1 + expectedPacket1Bytes.length] = 0x01;
+		System.arraycopy(expectedPacket2Bytes, 0,
+				bytes, 2 + expectedPacket1Bytes.length, expectedPacket2Bytes.length);
+	}
+}