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);
for (int i = 0; i < torrentData.Files.Length; i++)
{
if (torrentData.Files[i].Priority != Priority.DoNotDownload)
{
endgameSelector.Or(torrentData.Files[i].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.
int count = standard.CurrentReceivedCount();
int blocksPerPiece = torrentData.PieceLength / Piece.BlockSize;
inEndgame = Math.Max(blocksPerPiece, (endgameSelector.TrueCount * blocksPerPiece)) - count <= Threshold;
if (inEndgame)
{
endgame.Initialise(bitfield, torrentData, standard.ExportActiveRequests());
standard.Reset();
// Set torrent's IsInEndGame flag
if (torrentManager != null)
{
torrentManager.isInEndGame = true;
}
}
return(inEndgame);
}
public virtual List <Piece> ExportActiveRequests()
{
CheckOverriden();
return(picker.ExportActiveRequests());
}