Erlang.NET.OtpEpmd.r4_lookupPort C# (CSharp) Méthode

        private static int r4_lookupPort(AbstractNode node)
        {
            int port = 0;

            try
            {
                OtpOutputStream obuf = new OtpOutputStream();
                using (TcpClient s = new TcpClient(node.Host, EpmdPort.get()))
                {
                    // build and send epmd request
                    // length[2], tag[1], alivename[n] (length = n+1)
                    obuf.write2BE(node.Alive.Length + 1);
                    obuf.write1(port4req);
                    obuf.writeN(Encoding.GetEncoding("iso-8859-1").GetBytes(node.Alive));

                    // send request
                    obuf.WriteTo(s.GetStream());

                    if (traceLevel >= traceThreshold)
                    {
                        log.Debug("-> LOOKUP (r4) " + node);
                    }

                    // receive and decode reply
                    // resptag[1], result[1], port[2], ntype[1], proto[1],
                    // disthigh[2], distlow[2], nlen[2], alivename[n],
                    // elen[2], edata[m]
                    byte[] tmpbuf = new byte[100];

                    int n = s.GetStream().Read(tmpbuf, 0, tmpbuf.Length);

                    if (n < 0)
                    {
                        // this was an r3 node => not a failure (yet)
                        throw new IOException("Nameserver not responding on "
                                      + node.Host + " when looking up " + node.Alive);
                    }

                    OtpInputStream ibuf = new OtpInputStream(tmpbuf, 0);

                    int response = ibuf.read1();
                    if (response == port4resp)
                    {
                        int result = ibuf.read1();
                        if (result == 0)
                        {
                            port = ibuf.read2BE();

                            node.Type = ibuf.read1();
                            node.Proto = ibuf.read1();
                            node.DistHigh = ibuf.read2BE();
                            node.DistLow = ibuf.read2BE();
                            // ignore rest of fields
                        }
                    }
                }
            }
            catch (SocketException)
            {
                if (traceLevel >= traceThreshold)
                {
                    log.Debug("<- (no response)");
                }
                throw new IOException("Nameserver not responding on " + node.Host);
            }
            catch (IOException)
            {
                if (traceLevel >= traceThreshold)
                {
                    log.Debug("<- (no response)");
                }
                throw new IOException("Nameserver not responding on " + node.Host
                              + " when looking up " + node.Alive);
            }
            catch (OtpErlangDecodeException)
            {
                if (traceLevel >= traceThreshold)
                {
                    log.Debug("<- (invalid response)");
                }
                throw new IOException("Nameserver not responding on " + node.Host
                              + " when looking up " + node.Alive);
            }

            if (traceLevel >= traceThreshold)
            {
                if (port == 0)
                {
                    log.Debug("<- NOT FOUND");
                }
                else
                {
                    log.Debug("<- PORT " + port);
                }
            }
            return port;
        }