Function PacketGet

source/common/engine/i_net.cpp:279–359

PacketGet

// PacketGet
//
void PacketGet (void)
{
	int c;
	socklen_t fromlen;
	sockaddr_in fromaddress;
	int node;

	fromlen = sizeof(fromaddress);
	c = recvfrom (mysocket, (char*)TransmitBuffer, TRANSMIT_SIZE, 0,
				  (sockaddr *)&fromaddress, &fromlen);
	node = FindNode (&fromaddress);

	if (node >= 0 && c == SOCKET_ERROR)
	{
		int err = WSAGetLastError();

		if (err == WSAECONNRESET)
		{ // The remote node aborted unexpectedly, so pretend it sent an exit packet

			if (StartWindow != NULL)
			{
				I_NetMessage ("The connection from %s was dropped.\n",
					GetPlayerName(node).GetChars());
			}
			else
			{
				Printf("The connection from %s was dropped.\n",
					GetPlayerName(node).GetChars());
			}

			doomcom.data[0] = NCMD_EXIT;
			c = 1;
		}
		else if (err != WSAEWOULDBLOCK)
		{
			I_Error ("GetPacket: %s", neterror ());
		}
		else
		{
			doomcom.remotenode = -1;		// no packet
			return;
		}
	}
	else if (node >= 0 && c > 0)
	{
		doomcom.data[0] = TransmitBuffer[0] & ~NCMD_COMPRESSED;
		if (TransmitBuffer[0] & NCMD_COMPRESSED)
		{
			uLongf msgsize = MAX_MSGLEN - 1;
			int err = uncompress(doomcom.data + 1, &msgsize, TransmitBuffer + 1, c - 1);
//			Printf("recv %d/%lu\n", c, msgsize + 1);
			if (err != Z_OK)
			{
				Printf("Net decompression failed (zlib error %s)\n", M_ZLibError(err).GetChars());
				// Pretend no packet
				doomcom.remotenode = -1;
				return;
			}