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;
}
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;
}
