/// <summary>
/// Initializes a new instance of the <see cref="file_client"/> class.
///
/// file_client metoden opretter en peer-to-peer forbindelse
/// Sender en forspørgsel for en bestemt fil om denne findes på serveren
/// Modtager filen hvis denne findes eller en besked om at den ikke findes (jvf. protokol beskrivelse)
/// Lukker alle streams og den modtagede fil
/// Udskriver en fejl-meddelelse hvis ikke antal argumenter er rigtige
/// </summary>
/// <param name='args'>
/// Filnavn med evtuelle sti.
/// </param>
private file_client(String[] args, Transport transportStream)
{
try
{
Console.WriteLine ("Retrieving file");
string fileToReceive = (args.Length > 0) ? args[0] : "billede.jpg";
transportStream.sendText(fileToReceive);
//Read confirmation that file exists
if (transportStream.readText() == "File found")
{
receiveFile (fileToReceive, transportStream);
}
else
{
Console.WriteLine ("404 - File not found");
}
}
catch (Exception ex)
{
Console.WriteLine ("Generel exception occured");
Console.WriteLine(ex.Message);
}
finally
{
}
}
/// <summary>
/// Initializes a new instance of the <see cref="file_server"/> class.
/// </summary>
private file_server(Transport transport)
{
try
{
Console.WriteLine("Server started - Listening for client");
//Get filename
string fileToSend = transport.readText();
Console.WriteLine("Client trying to retrieve file: " + fileToSend);
long fileSize = LIB.check_File_Exists (fileToSend);
if (fileSize != 0)
{
transport.sendText("File found");
sendFile (fileToSend, fileSize, transport);
}
else
{
transport.sendText("File not found");
Console.WriteLine ("404 - File not found");
}
}
catch (Exception ex)
{
Console.WriteLine (ex.Message);
}
finally
{
Console.WriteLine ("Exit");
}
}
/// <summary>
/// Sends the file.
/// </summary>
/// <param name='fileName'>
/// File name.
/// </param>
/// <param name='fileSize'>
/// File size.
/// </param>
/// <param name='tl'>
/// Tl.
/// </param>
private void sendFile(String fileName, long fileSize, Transport transport)
{
FileStream fileStream = null;
try
{
Console.WriteLine ("Size of file " + fileSize);
transport.sendText(fileSize.ToString());
byte[] SendingBuffer = null;
fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read);
int NoOfPackets = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(fileStream.Length) / Convert.ToDouble(BUFSIZE)));
int TotalLength = (int)fileStream.Length;
int CurrentPacketLength, bytesSent = 0;
for (int i = 1; i < NoOfPackets+1; i++)
{
if (TotalLength > BUFSIZE)
{
CurrentPacketLength = BUFSIZE;
TotalLength = TotalLength - CurrentPacketLength;
bytesSent += BUFSIZE;
}
else
{
CurrentPacketLength = TotalLength;
bytesSent += CurrentPacketLength;
}
SendingBuffer = new byte[CurrentPacketLength];
fileStream.Read(SendingBuffer, 0, CurrentPacketLength);
transport.send(SendingBuffer, (int)SendingBuffer.Length);
Console.Write("\rSent " + i + " of " + NoOfPackets + " packets to client. Total of " + bytesSent + " bytes sent");
}
Console.WriteLine ("\nFile sent - closing connection");
}
catch (Exception ex)
{
Console.WriteLine (ex.Message);
}
finally
{
if (fileStream != null)
fileStream.Close ();
}
}