private bool AcceptIncomingPacket(SeqNo seq)
{
if (_isFirstIncomingPacketAck)
{
_incomingPacketAck = seq - 1;
_incomingPacketAckBuffer.ClearAll();
_isFirstIncomingPacketAck = false;
}
var diff = seq.CompareTo(_incomingPacketAck);
if (diff == 0)
{
// Already received packet
return(false);
}
else if (diff > 0)
{
_incomingPacketAck = seq;
if (diff < _incomingPacketAckBuffer.Capacity)
{
// New packet
_incomingPacketAckBuffer.LeftShift(diff);
}
else
{
// Early packet but still ok
_incomingPacketAckBuffer.ClearAll();
}
_incomingPacketAckBuffer.Set(0);
return(true);
}
else
{
diff *= -1;
if (diff < _incomingPacketAckBuffer.Capacity)
{
if (_incomingPacketAckBuffer[diff])
{
// Already received packet
return(false);
}
else
{
// New packet
_incomingPacketAckBuffer.Set(diff);
return(true);
}
}
else
{
// Late packet
return(false);
}
}
}