private void HandleNotifyPacket(Connection connection, Packet packet)
{
if (packet.Data.Length < NotifyPacketHeaderSize)
{
return;
}
var offset = 1;
var packetSequenceNumber = ByteUtils.ReadULong(packet.Data, offset, _config.SequenceNumberBytes);
offset += _config.SequenceNumberBytes;
var remoteRecvSequence = ByteUtils.ReadULong(packet.Data, offset, _config.SequenceNumberBytes);
offset += _config.SequenceNumberBytes;
var remoteRecvMask = ByteUtils.ReadULong(packet.Data, offset, sizeof(ulong));
var sequenceDistance = connection.SendSequencer.Distance(packetSequenceNumber, connection.LastReceivedSequence);
// Sequence so out of bounds we can't save, just disconnect
if (Math.Abs(sequenceDistance) > _config.SendWindowSize)
{
DisconnectConnection(connection, DisconnectReason.SequenceOutOfBounds);
return;
}
// Sequence is old, so duplicate or re-ordered packet
if (sequenceDistance <= 0)
{
return;
}
// Update recv sequence for ou local connection object
connection.LastReceivedSequence = packetSequenceNumber;
if (sequenceDistance >= ACK_MASK_BITS)
{
connection.ReceiveMask = 1; // 0000 0000 0000 0000 0000 0000 0000 0001
}
else
{
connection.ReceiveMask = (connection.ReceiveMask << (int)sequenceDistance) | 1;
}
AckPackets(connection, remoteRecvSequence, remoteRecvMask);
// Only a ack packet
if (packet.Data.Length == NotifyPacketHeaderSize)
{
return;
}
var trimedPacket = packet.Slice(NotifyPacketHeaderSize);
OnNotityPacketReceived?.Invoke(connection, trimedPacket);
}
