private static void HandleDirectoryRequest(UdpClient server)
        {
            DirectoryMetadataPacket dir = new DirectoryMetadataPacket(Constants.TYPE_DIRECTORY_REQUEST);

            PingPong.sendUntilAck(dir, server);
            IPEndPoint remoteIPEndPoint = null;
            bool success = false;
            while (!success) {
                success = PingPong.StartReceiveDirectory(server.Receive(ref remoteIPEndPoint), server);
            }
        }
Example #2
0
        public static bool SendDirectoryTo(UdpClient target)
        {
            IPEndPoint remoteIPEndPoint = null;
            byte[] directoryListing = Utils.GetDirectoryListing();
            int totalPackets = Utils.GetDirectoryPacketsTotal();
            DirectoryMetadataPacket directoryMetadataPacket = new DirectoryMetadataPacket(Constants.TYPE_DIRECTORY_DELIVERY, totalPackets, directoryListing.Length);
            bool sent = false;
            Stopwatch timeout = new Stopwatch();
            byte[] receivedBytes = null;

            while (!sent) {
                Utils.SendTo(target, directoryMetadataPacket.MyPacketAsBytes);
                timeout.Restart();
                while (timeout.ElapsedMilliseconds < Constants.PACKET_TIMEOUT_MILLISECONDS) {
                    if (target.Available != 0) {
                        receivedBytes = target.Receive(ref remoteIPEndPoint);
                        if (!Utils.VerifyChecksum(receivedBytes)) {
                            continue;
                        }
                        if (receivedBytes[Constants.FIELD_TYPE] == Constants.TYPE_DIRECTORY_REQUEST) {
                            return false;
                        }

                        if (BitConverter.ToInt32(receivedBytes, Constants.FIELD_ACK_ID) == -1) {
                            sent = true;
                            break;
                        }
                    }
                }
            }

            int byteIndex = 0;
            for (int i = 0; i < totalPackets; i++) {
                byte[] stagedPayload = new byte[Constants.PAYLOAD_SIZE];
                stagedPayload = Utils.InitializeArray(stagedPayload);
                for (int j = 0; j < stagedPayload.Length; j++) {
                    if (j < directoryListing.Length && byteIndex < directoryListing.Length) {
                        stagedPayload[j] = directoryListing[byteIndex];
                        byteIndex++;
                    }
                }
                DataPacket stagedPacket = new DataPacket(stagedPayload, i);
                sendUntilAck(stagedPacket, target);
            }
            return true;
        }