void DataStreamRead_End(IAsyncResult ar)
{
TransStateObjectStream stateObj = (TransStateObjectStream)ar.AsyncState;
try
{
stateObj.UpdateContext();
int num = DataStream.EndRead(ar);
DTPStream userStream = (DTPStream)stateObj.UserStream;
if (num > 0)
{
long require = userStream.AvailableSpace;
if (num > require)
{
num = (int)require;
}
stateObj.Transfered += num;
OnDataTransfered(_workBuffer, num);
//write received data to user stream
userStream.BeginWrite(_workBuffer,
0,
num,
new AsyncCallback(this.UserStreamWrite_End),
stateObj);
}
else
{
userStream.Flush();
OnCompleted();
stateObj.SetCompleted();
}
}
catch (Exception e)
{
stateObj.Exception = e;
stateObj.SetCompleted();
}
catch
{
NSTrace.WriteLineError("Non-CLS exception at: " + Environment.StackTrace);
throw;
}
}
void UserStreamWrite_End(IAsyncResult ar)
{
TransStateObjectStream stateObj = (TransStateObjectStream)ar.AsyncState;
try
{
stateObj.UpdateContext();
DTPStream userStream = (DTPStream)stateObj.UserStream;
userStream.EndWrite(ar);
if (_aborted)
{
throw new FtpAbortedException();
}
if (userStream.AvailableSpace > 0)
{
DataStream.BeginRead(_workBuffer,
0,
_workBuffer.Length,
new AsyncCallback(this.DataStreamRead_End),
stateObj);
}
else
{
_manuallyClosed = true;
userStream.Flush();
OnCompleted();
stateObj.SetCompleted();
}
}
catch (Exception e)
{
stateObj.Exception = e;
stateObj.SetCompleted();
}
catch
{
NSTrace.WriteLineError("Non-CLS exception at: " + Environment.StackTrace);
throw;
}
}
void RunDownloadingStream(DTPStream userStream)
{
bool needMoreData = true;
while (true)
{
int num = DataStream.Read(_workBuffer, 0, _workBuffer.Length);
if (num > 0)
{
long require = userStream.AvailableSpace;
if (num > require)
{
num = (int)require;
needMoreData = false;
}
OnDataTransfered(_workBuffer, num);
userStream.Write(_workBuffer, 0, num);
}
if ((0 == num) || (false == needMoreData))
{
//Determine wether we had read enough information.
//We need to know it, because usually server
//should close connection by him self,
//and if we will do this instead, server will
//return errorneous response later
if (num > 0)
{
_manuallyClosed = true;
}
userStream.Flush();
OnCompleted();
break;
}
else if (_aborted)
{
throw new FtpAbortedException();
}
}
}