private bool TryEnableEndgame()
{
if (_inEndgame)
{
return(false);
}
// We need to activate endgame mode when there are less than 20 requestable blocks
// available. We OR the bitfields of all the files which are downloadable and then
// NAND it with the torrents bitfield to get a list of pieces which remain to be downloaded.
// Essentially we get a list of all the pieces we're allowed download, then get a list of
// the pieces which we still need to get and AND them together.
// Create the bitfield of pieces which are downloadable
_endgameSelector.SetAll(false);
foreach (var t in _files.Where(t => t.Priority != Priority.DoNotDownload))
{
_endgameSelector.Or(t.GetSelector(_bitfield.Length));
}
// NAND it with the pieces we already have (i.e. AND it with the pieces we still need to receive)
_endgameSelector.NAnd(_bitfield);
// If the total number of blocks remaining is less than Threshold, activate Endgame mode.
var pieces = _standard.ExportActiveRequests();
var count = pieces.Sum(t => t.TotalReceived);
_inEndgame = Math.Max(_blocksPerPiece, (_endgameSelector.TrueCount * _blocksPerPiece)) - count < Threshold;
if (_inEndgame)
{
_endgame.Initialise(_bitfield, _files, _standard.ExportActiveRequests());
// Set torrent's IsInEndGame flag
_torrentManager.InternalIsInEndGame = true;
}
return(_inEndgame);
}
public virtual List <Piece> ExportActiveRequests()
{
CheckOverriden();
return(_picker.ExportActiveRequests());
}
