private void AddNewSegmentIfNeeded()
{
lock (segments)
{
for (int i = 0; i < this.segments.Count; i++)
{
Segment oldSegment = this.segments[i];
if (oldSegment.State == SegmentState.Downloading &&
oldSegment.Left.TotalSeconds > Settings.Default.MinSegmentLeftToStartNewSegment &&
oldSegment.MissingTransfer / 2 >= Settings.Default.MinSegmentSize)
{
// get the half of missing size of oldSegment
long newSize = oldSegment.MissingTransfer / 2;
// create a new segment allocation the half old segment
Segment newSegment = new Segment();
newSegment.Index = this.segments.Count;
newSegment.StartPosition = oldSegment.StartPosition + newSize;
newSegment.InitialStartPosition = newSegment.StartPosition;
newSegment.EndPosition = oldSegment.EndPosition;
newSegment.OutputStream = oldSegment.OutputStream;
// removes bytes from old segments
oldSegment.EndPosition = oldSegment.EndPosition - newSize;
// add the new segment to the list
segments.Add(newSegment);
StartSegment(newSegment);
break;
}
}
}
}
private void StartSegment(Segment newSegment)
{
Thread segmentThread = new Thread(new ParameterizedThreadStart(SegmentThreadProc));
segmentThread.Start(newSegment);
lock (threads)
{
threads.Add(segmentThread);
}
}
private void StartSegments(int segmentCount, Stream inputStream)
{
// notifies
OnInfoReceived();
// allocs the file on disk
AllocLocalFile();
long segmentSize;
CalculatedSegment[] calculatedSegments;
if (!remoteFileInfo.AcceptRanges)
{
calculatedSegments = new CalculatedSegment[] { new CalculatedSegment(0, remoteFileInfo.FileSize) };
}
else
{
calculatedSegments = this.SegmentCalculator.GetSegments(segmentCount, remoteFileInfo);
}
lock (threads) threads.Clear();
lock (segments) segments.Clear();
for (int i = 0; i < calculatedSegments.Length; i++)
{
Segment segment = new Segment();
if (i == 0)
{
segment.InputStream = inputStream;
}
segment.Index = i;
segment.InitialStartPosition = calculatedSegments[i].StartPosition;
segment.StartPosition = calculatedSegments[i].StartPosition;
segment.EndPosition = calculatedSegments[i].EndPosition;
segments.Add(segment);
}
RunSegments();
}
protected virtual void OnSegmentStarted(Segment segment)
{
if (SegmentStarted != null)
{
SegmentStarted(this, new SegmentEventArgs(this, segment));
}
}
protected virtual void OnRestartingSegment(Segment segment)
{
if (RestartingSegment != null)
{
RestartingSegment(this, new SegmentEventArgs(this, segment));
}
}
public SegmentEventArgs(Downloader d, Segment segment)
: base(d)
{
this.segment = segment;
}
