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);
}
}
