add unknown packet object

src/main/java/mc/protocol/UnknownPacket.java

@@ -0,0 +1,25 @@
+package mc.protocol;
+
+import lombok.Data;
+import lombok.ToString;
+
+@Data
+@ToString(exclude = "rawData")
+public class UnknownPacket implements Packet {
+
+    private final State state;
+    private final int id;
+    private final int dataSize;
+    private byte[] rawData;
+
+    @Override
+    public void readSelf(NetInputStream netInputStream) {
+        rawData = new byte[dataSize];
+        netInputStream.readBytes(rawData);
+    }
+
+    @Override
+    public void writeSelf(NetOutputStream netOutputStream) {
+        netOutputStream.writeBytes(rawData);
+    }
+}

src/main/java/mc/protocol/Utils.java

@@ -0,0 +1,17 @@
+package mc.protocol;
+
+import lombok.experimental.UtilityClass;
+
+@UtilityClass
+public class Utils {
+
+    public int sizeOfVarInt(int value) {
+        for (int i = 1; i < 5; ++i) {
+            if ((value & -1 << i * 7) == 0) {
+                return i;
+            }
+        }
+
+        return 5;
+    }
+}

src/main/java/mc/protocol/coder/ProtocolDecoder.java

@@ -13,12 +13,7 @@ https://wiki.vg/index.php?title=Protocol&oldid=7368#Without_compression
 */
 
 import lombok.RequiredArgsConstructor;
-import mc.protocol.NetInputStream;
-import mc.protocol.Packet;
-import mc.protocol.PacketDirection;
-import mc.protocol.State;
-
-import java.util.Objects;
+import mc.protocol.*;
 
 @RequiredArgsConstructor
 public class ProtocolDecoder {
@@ -31,8 +26,16 @@ public class ProtocolDecoder {
 
         int packetId = netInputStream.readVarInt();
         Class<? extends Packet> packetClass = state.getPacketById(direction, packetId);
-        Objects.requireNonNull(packetClass);
-
+        if (packetClass == null) {
+            //FIXME необходимо в лог пивать предупреждение
+            UnknownPacket packet = new UnknownPacket(
+                    state,
+                    packetId,
+                    sizePacket - Utils.sizeOfVarInt(packetId)
+            );
+            packet.readSelf(netInputStream);
+            return packet;
+        } else {
             try {
                 Packet packet = packetClass.newInstance();
                 packet.readSelf(netInputStream);
@@ -43,3 +46,4 @@ public class ProtocolDecoder {
             }
         }
     }
+}