// C code:
rc_packet *net_recv_packet(int sd)
{
    int psize;
    static rc_packet packet = {0, 0, 0, { 0x00 }};

    /* packet.size = packet.id = packet.cmd = 0; */

    int ret = recv(sd, (char *) &psize, sizeof(int), 0);

    if(ret == 0) {
        fprintf(stderr, "Connection lost.\n");
        connection_alive = 0;
        return NULL;
    }

    if(ret != sizeof(int)) {
        fprintf(stderr, "Error: recv() failed. Invalid packet size (%d).\n", ret);
        connection_alive = 0;
        return NULL;
    }

    if(psize < 10 || psize > DATA_BUFFSIZE) {
        fprintf(stderr, "Warning: invalid packet size (%d). Must over 10 and less than %d.\n", psize, DATA_BUFFSIZE);
        if(psize > DATA_BUFFSIZE  || psize < 0) psize = DATA_BUFFSIZE;
        net_clean_incoming(sd, psize);
        return NULL;
    }

    packet.size = psize;

    ret = recv(sd, (char *) &packet + sizeof(int), psize, 0);
    if(ret == 0) {
        fprintf(stderr, "Connection lost.\n");
        connection_alive = 0;
        return NULL;
    }
    if(ret != psize) {
        fprintf(stderr, "Warning: recv() return value (%d) does not match expected packet size (%d).\n", ret, psize);
        net_clean_incoming(sd, DATA_BUFFSIZE); /* Should be enough. Needs some checking */
        return NULL;
    }

    return &packet;
}

// Java code:
Packet recvPacket()
{
	Packet p = new Packet();
	try
	{
		// reader = new DataInputStream(sock.getInputStream()); // in the class constructor
		p.size = reader.readInt();
		if (p.size < 10 || p.size > buffsize)
			throw new Exception("Invalid packet size.");
		p.id = reader.readInt();
		p.cmd = reader.readInt();
		p.data = new byte[p.size - 8];
		for (int i = 0; i < p.data.length; i++)
			p.data[i] = reader.readByte();
	} catch (Exception e)
	{
		Util.printToConsole(e.getMessage()); //prints to a dedicated JTextArea
		return null;
	}
	return p;
}