public async Task <int> ReadAsync(byte[] buffer, int bufferOffset, int count, long offset)
{
if (_writer == null)
{
throw new InvalidDataException("Writer not initialized");
}
if (_torrentFile == null)
{
throw new InvalidDataException("Torrent file not initialized");
}
Position = offset + count;
return(await Task.Run(() => _writer.Read(_torrentFile, offset, buffer, bufferOffset, count)));
}
byte [] CalcPiecesHash(List <TorrentFile> files, IPieceWriter writer, CancellationToken token)
{
int bufferRead = 0;
long fileRead = 0;
long overallRead = 0;
MD5 md5Hasher = null;
var shaHasher = HashAlgoFactory.Create <SHA1> ();
var torrentHashes = new List <byte> ();
var overallTotal = files.Sum(t => t.Length);
var buffer = new byte [PieceLength];
if (StoreMD5)
{
md5Hasher = HashAlgoFactory.Create <MD5> ();
}
try {
foreach (TorrentFile file in files)
{
fileRead = 0;
md5Hasher?.Initialize();
while (fileRead < file.Length)
{
int toRead = (int)Math.Min(buffer.Length - bufferRead, file.Length - fileRead);
int read = writer.Read(file, fileRead, buffer, bufferRead, toRead);
token.ThrowIfCancellationRequested();
md5Hasher?.TransformBlock(buffer, bufferRead, read, buffer, bufferRead);
shaHasher.TransformBlock(buffer, bufferRead, read, buffer, bufferRead);
bufferRead += read;
fileRead += read;
overallRead += read;
if (bufferRead == buffer.Length)
{
bufferRead = 0;
shaHasher.TransformFinalBlock(buffer, 0, 0);
torrentHashes.AddRange(shaHasher.Hash);
shaHasher.Initialize();
}
Hashed?.InvokeAsync(this, new TorrentCreatorEventArgs(file.Path, fileRead, file.Length, overallRead, overallTotal));
}
md5Hasher?.TransformFinalBlock(buffer, 0, 0);
md5Hasher?.Initialize();
file.MD5 = md5Hasher?.Hash;
}
if (bufferRead > 0)
{
shaHasher.TransformFinalBlock(buffer, 0, 0);
torrentHashes.AddRange(shaHasher.Hash);
}
} finally {
shaHasher.Dispose();
md5Hasher?.Dispose();
}
return(torrentHashes.ToArray());
}