private const int BlockRequestSize = 16384; // 16 kB
public IEnumerable <BlockRequest> BlocksToRequest(IReadOnlyList <Piece> incompletePieces,
Bitfield availability,
IReadOnlyCollection <PeerConnection> peers,
IBlockRequests blockRequests)
{
var toRequest = new List <BlockRequest>();
int maxToRequest = MaxOutstandingRequests - blockRequests.RequestedBlocks.Count;
foreach (var piece in incompletePieces)
{
if (toRequest.Count >= maxToRequest)
{
break;
}
if (!availability.IsPieceAvailable(piece.Index))
{
continue;
}
var block = NextBlockForPiece(piece, blockRequests);
if (block != null)
{
toRequest.Add(block);
}
}
return(toRequest);
}
/// <summary>
/// Determines whether Bitfield a has pieces not available in Bitfield b.
/// </summary>
/// <param name="a">Bitfield to check for more pieces in.</param>
/// <param name="b">Bitfield to compare against.</param>
/// <returns>True if a has more pieces </returns>
public static bool NotSubset(Bitfield a, Bitfield b)
{
for (int i = 0; i < a.Length; i++)
{
if (a.IsPieceAvailable(i) && !b.IsPieceAvailable(i))
{
return(true);
}
}
return(false);
}