public void Read(BinaryReader br) { if (br.BaseStream.Length < 4) { throw new Exception("Fragmented receive, should not happen! (4 size header)"); } Size = br.ReadUInt16(); Channel = br.ReadByte(); br.ReadByte(); // padding if (Size > br.BaseStream.Length) { Debugger.Break(); throw new Exception($"Fragmented receive, should not happen! Packet size: {Size} <-> Buffer length: {br.BaseStream.Length}"); } if (Channel == 0xFF) // Internal channel: Send timeout checking, ignore the packet { return; } if (Channel != 0) // 0 == ReliableStreamChannel (no extra data), Move message uses channels { SequenceNumber = br.ReadUInt32(); // Sequence number? if (previousValue - newValue < 0) { process packet; previousValue = newValue; } br.ReadInt32(); // 0xDEADBEEF br.ReadInt32(); // skip } var packetBeginPosition = br.BaseStream.Position; using (var reader = new ProtocolBufferReader(br, ProtocolBufferFlags.DontFragment)) { reader.ReadProtocolFlags(); reader.ReadPacketType(out ushort type, out bool compress); Type = (ClientMessageOpcode)type; Compress = compress; reader.ReadXORCheck((int)(br.BaseStream.Position - packetBeginPosition)); } var xorCheckPosition = (int)br.BaseStream.Position; var readBr = br; BufferData buffer = null; if (Compress) { var someType = br.ReadByte(); // 0 = No compression if (someType >= 2) { throw new Exception("Invalid compress type received!"); } if (someType == 1) { Debugger.Break(); // TODO: test var uncompressedSize = br.ReadInt32(); byte[] uncompressedData; var offset = 0; if (uncompressedSize > BufferManager.BlockSize) { uncompressedData = new byte[uncompressedSize]; } else { buffer = BufferManager.RequestBuffer(); uncompressedData = buffer.Buffer; offset = buffer.BaseOffset; } using (var deflateStream = new DeflateStream(br.BaseStream, CompressionMode.Decompress, true)) // TODO: test if the br.BaseStream is cool as the Stream input for the DeflateStream deflateStream.Read(uncompressedData, offset, uncompressedSize); readBr = buffer != null?buffer.GetReader() : new BinaryReader(new MemoryStream(uncompressedData, 0, uncompressedSize, false), Encoding.UTF8, false); } } // ReSharper disable SwitchStatementMissingSomeCases switch (Type) { case ClientMessageOpcode.Login: Message = new LoginMessage(); break; case ClientMessageOpcode.Move: Message = new MoveMessage(); break; case ClientMessageOpcode.CallServerMethod: Message = new CallServerMethodMessage(); break; case ClientMessageOpcode.Ping: Message = new PingMessage(); break; default: throw new Exception($"Unable to handle packet type {Type}, because it's a Server -> Client packet!"); } // ReSharper restore SwitchStatementMissingSomeCases using (var reader = new ProtocolBufferReader(readBr, ProtocolBufferFlags.DontFragment)) { reader.ReadProtocolFlags(); // Subtype and Message.Read() reader.ReadDebugByte(41); if ((Message.SubtypeFlags & ClientMessageSubtypeFlag.HasSubtype) == ClientMessageSubtypeFlag.HasSubtype) { Message.RawSubtype = reader.ReadByte(); if (Message.RawSubtype < Message.MinSubtype || Message.RawSubtype > Message.MaxSubtype) { throw new Exception("Invalid Subtype found!"); } } Message.Read(reader); reader.ReadDebugByte(42); reader.ReadXORCheck((int)br.BaseStream.Position - xorCheckPosition); } if (buffer != null) // If we requested a buffer for decompressing, free it { BufferManager.FreeBuffer(buffer); } }