private static void HandleFileGetRequest(UdpClient target)
{
IPEndPoint remoteIPEndPoint = null;
Console.Write("Please enter a filepath\\filename: ");
string name = Console.ReadLine();
FileMetadataPacket pack = new FileMetadataPacket(Constants.TYPE_FILE_REQUEST, 0, name.Length, Encoding.Default.GetBytes(name), 0);
byte[] receivedBytes = null;
bool sent = false;
Stopwatch timeout = new Stopwatch();
byte[] backup = new byte[Constants.PACKET_SIZE];
while (!sent) {
for (int i = 0; i < Constants.PACKET_SIZE; i++) {
backup[i] = pack.MyPacketAsBytes[i];
}
Utils.SendTo(target, backup);
timeout.Restart();
while (timeout.ElapsedMilliseconds < Constants.PACKET_TIMEOUT_MILLISECONDS) {
if (target.Available != 0) {
receivedBytes = target.Receive(ref remoteIPEndPoint);
if (Utils.VerifyChecksum(receivedBytes)) {
if (receivedBytes[Constants.FIELD_TYPE] == Constants.TYPE_FILE_DELIVERY) {
sent = true;
}
}
}
}
}
PingPong.SendAckTo(-1, target);
bool success = false;
while (!success) {
AckPacket ack = new AckPacket(-1);
Utils.SendTo(target, ack.MyPacketAsBytes);
success = PingPong.ReceiveFileFrom(receivedBytes, target);
}
Console.WriteLine("File received successfully.");
}
public static bool SendFileTo(string filename, UdpClient target)
{
FileInfo localMeta;
byte[] fileNameAsBytes;
int totalPackets;
try {
localMeta = new FileInfo(filename);
fileNameAsBytes = Encoding.Default.GetBytes(filename);
totalPackets = (int)localMeta.Length / Constants.PAYLOAD_SIZE;
if ((int)localMeta.Length % Constants.PAYLOAD_SIZE != 0 || totalPackets < 1) {
totalPackets++;
}
}
catch (ArgumentException ex) {
return false;
}
catch (FileNotFoundException ex) {
throw new FileNotFoundException();
}
FileMetadataPacket meta = new FileMetadataPacket(Constants.TYPE_FILE_DELIVERY, (int)localMeta.Length, filename.Length, fileNameAsBytes, totalPackets);
sendUntilAck(meta, target);
try {
StreamReader localFile = new StreamReader(filename, Encoding.Default);
for (int i = 0; i < totalPackets; i++) {
char[] stagedPayload = new char[Constants.PAYLOAD_SIZE];
localFile.Read(stagedPayload, 0, Constants.PAYLOAD_SIZE);
byte[] encoded = Encoding.Default.GetBytes(stagedPayload);
DataPacket stagedPacket = new DataPacket(Encoding.Default.GetBytes(stagedPayload), i);
sendUntilAck(stagedPacket, target);
}
localFile.Close();
}
catch (UnauthorizedAccessException ex) {
Console.WriteLine("Insufficient permissions to access specified file: " + ex.Message);
}
catch (IOException ex) {
}
return true;
}