private static InfoHash ComputeInfoHash(BEncoding.Dictionary info)
{
using (var stream = new MemoryStream())
{
BEncoding.Encode(info, stream);
stream.Seek(0L, SeekOrigin.Begin);
byte[] hash = HashHelper.ComputeSHA1(stream);
return(new InfoHash(hash));
}
}
/// <summary>
/// Saves this torrent information to a stream.
/// </summary>
/// <param name="stream">The stream to save to.</param>
public void SaveToStream(Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
else if (!stream.CanWrite)
{
throw new ArgumentException("The stream cannot be written to.", "stream");
}
var torrentInfo = Save();
BEncoding.Encode(torrentInfo, stream);
}
public Torrent(string name,
string downloadDir,
List <FileItem> files,
List <string> trackers,
int pieceSize,
byte[] pieceHashes = null,
int blockSize = 16384,
bool?isPrivate = false)
{
Name = name;
DownloadDirectory = downloadDir;
Files = files;
PieceSize = pieceSize;
BlockSize = blockSize;
IsPrivate = isPrivate;
fileWriteLocks = new object[Files.Count];
for (var i = 0; i < Files.Count; ++i)
{
fileWriteLocks[i] = new object();
}
if (trackers != null)
{
foreach (var url in trackers)
{
var tracker = new Tracker(url);
Trackers.Add(tracker);
tracker.PeerListUpdated += HandlePeerListUpdated;
}
}
var piecesCount = Convert.ToInt32(Math.Ceiling(TotalSize / Convert.ToDouble(PieceSize)));
PieceHashes = new byte[piecesCount][];
IsPieceVerified = new bool[piecesCount];
IsBlockAcquired = new bool[piecesCount][];
for (var i = 0; i < PieceCount; ++i)
{
IsBlockAcquired[i] = new bool[GetBlockCount(i)];
}
if (pieceHashes != null)
{
for (var i = 0; i < PieceCount; ++i)
{
PieceHashes[i] = GetHash(i);
}
}
else
{
for (var i = 0; i < PieceCount; ++i)
{
PieceHashes[i] = new byte[20];
Buffer.BlockCopy(pieceHashes, i * 20, PieceHashes[i], 0, 20);
}
}
object info = TorrentInfoToBEncodingObject(this);
byte[] bytes = BEncoding.Encode(info);
InfoHash = SHA1.Create().ComputeHash(bytes);
for (var i = 0; i < PieceCount; ++i)
{
CheckIntegrityOfPiece(i);
}
}