private void ReadCallBack(IAsyncResult asyncResult)
{
lock (this.downloadAbortLock)
{
if (this.disposed || this.downloadAborted)
{
return;
}
// Get the DownloadInfo object from AsyncResult.
DownloadInfo info = (DownloadInfo)asyncResult.AsyncState;
if (info == null)
{
Abort();
}
// Retrieve the ResponseStream that was set in RespCallback.
Stream responseStream = info.ResponseStream;
if (responseStream == null)
{
Abort();
}
// Read info.BufferRead to verify that it contains data.
int bytesRead = responseStream.EndRead(asyncResult);
if (bytesRead > 0)
{
if (info.useFastBuffers)
{
System.Array.Copy(info.BufferRead, 0,
info.dataBufferFast, info.bytesProcessed,
bytesRead);
}
else
{
for (int b = 0; b < bytesRead; b++)
{
info.dataBufferSlow.Add(info.BufferRead[b]);
}
}
info.bytesProcessed += bytesRead;
// Perhaps we didn't originally get the content size, so we're
// just reading data with no end in sight. If that's the casre,
// abort the download if we cross the max download size.
if (info.bytesProcessed > MaxDownloadSizeInBytes)
{
//System.Console.WriteLine("Download has become too big, aborting");
Abort();
return;
}
// If a registered progress-callback, inform it of our
// download progress so far.
if ((info.ProgressCallback != null) && (!this.downloadAborted))
{
info.ProgressCallback(info.Request.RequestUri.AbsoluteUri, info.bytesProcessed, info.dataLength);
}
// Continue reading data until responseStream.EndRead returns –1.
IAsyncResult ar = responseStream.BeginRead(
info.BufferRead, 0, BUFFER_SIZE,
new AsyncCallback(ReadCallBack), info);
}
else
{
// We're done, signal completion
allDone.Set();
}
}
}
