///<summary>
///calculates all hashes over the files which should be included in the torrent
///</summmary>
byte[] CalcPiecesHash(string path, TorrentFile[] files, PieceWriter writer)
{
var piecesBuffer = new byte[GetPieceCount(files) * 20]; //holds all the pieces hashes
var piecesBufferOffset = 0;
var totalLength = Toolbox.Accumulate <TorrentFile>(files, delegate(TorrentFile f) { return(f.Length); });
var buffer = new ArraySegment <byte>(new byte[PieceLength]);
while (totalLength > 0)
{
var bytesToRead = (int)Math.Min(totalLength, PieceLength);
var io = new BufferedIO(null, buffer, (piecesBufferOffset / 20) * PieceLength, bytesToRead, bytesToRead, files, path);
totalLength -= writer.ReadChunk(io);
// If we are using the synchronous version, result is null
if (result != null && result.Aborted)
{
return(piecesBuffer);
}
var currentHash = hasher.ComputeHash(buffer.Array, 0, io.ActualCount);
RaiseHashed(new TorrentCreatorEventArgs(0,
0,
//reader.CurrentFile.Position, reader.CurrentFile.Length,
piecesBufferOffset * PieceLength,
(piecesBuffer.Length - 20) * PieceLength));
Buffer.BlockCopy(currentHash, 0, piecesBuffer, piecesBufferOffset, currentHash.Length);
piecesBufferOffset += currentHash.Length;
}
return(piecesBuffer);
}
byte [] CalcPiecesHash(List <TorrentFile> files, PieceWriter writer)
{
byte [] buffer = null;
int bufferRead = 0;
long fileRead = 0;
long overallRead = 0;
long overallTotal = 0;
MD5 md5Hasher = null;
SHA1 shaHasher = null;
List <byte> torrentHashes = null;
shaHasher = HashAlgoFactory.Create <SHA1> ();
torrentHashes = new List <byte> ();
overallTotal = Toolbox.Accumulate <TorrentFile> (files, delegate(TorrentFile m) { return(m.Length); });
long pieceLength = PieceLength;
buffer = new byte [pieceLength];
if (StoreMD5)
{
md5Hasher = HashAlgoFactory.Create <MD5> ();
}
try {
foreach (TorrentFile file in files)
{
fileRead = 0;
if (md5Hasher != null)
{
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);
cts?.Cancel();
if (md5Hasher != null)
{
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();
}
RaiseHashed(new TorrentCreatorEventArgs(file.Path, fileRead, file.Length, overallRead, overallTotal));
}
if (md5Hasher != null)
{
md5Hasher.TransformFinalBlock(buffer, 0, 0);
md5Hasher.Initialize();
file.MD5 = md5Hasher.Hash;
}
}
if (bufferRead > 0)
{
shaHasher.TransformFinalBlock(buffer, 0, 0);
torrentHashes.AddRange(shaHasher.Hash);
}
} finally {
if (shaHasher != null)
{
shaHasher.Clear();
}
if (md5Hasher != null)
{
md5Hasher.Clear();
}
}
return(torrentHashes.ToArray());
}
