private void CreateWriterWorkItemForNewChunk(ChunkHeader chunkHeader)
{
var md5 = MD5.Create();
var stream = new FileStream(_filename, FileMode.Create, FileAccess.ReadWrite, FileShare.Read,
WriteBufferSize, FileOptions.SequentialScan);
var writer = new BinaryWriter(stream);
stream.SetLength(chunkHeader.ChunkSize + ChunkHeader.Size + ChunkFooter.Size);
WriteHeader(md5, stream, chunkHeader);
_writerWorkItem = new WriterWorkItem(stream, writer, md5);
Flush();
}
private void CloseWriterStream()
{
if (_writerWorkItem == null)
{
return;
}
if (_writerWorkItem.Stream != null)
{
_writerWorkItem.Stream.Dispose();
}
var unmanagedStream = _writerWorkItem.UnmanagedMemoryStream;
if (unmanagedStream != null)
{
unmanagedStream.Dispose();
_writerWorkItem.UnmanagedMemoryStream = null;
}
_writerWorkItem = null;
}
private void CreateWriterWorkItemForExistingChunk(int writePosition, out ChunkHeader chunkHeader)
{
var md5 = MD5.Create();
var stream = new FileStream(_filename, FileMode.Open, FileAccess.ReadWrite, FileShare.Read,
WriteBufferSize, FileOptions.SequentialScan);
var writer = new BinaryWriter(stream);
try
{
chunkHeader = ReadHeader(stream);
}
catch
{
stream.Dispose();
((IDisposable)md5).Dispose();
throw;
}
var realPosition = GetRealPosition(writePosition, inMemory: false);
stream.Position = realPosition;
MD5Hash.ContinuousHashFor(md5, stream, 0, realPosition);
_writerWorkItem = new WriterWorkItem(stream, writer, md5);
}
private void CreateWriterWorkItemForNewChunk(ChunkHeader chunkHeader)
{
var md5 = MD5.Create();
var stream = new FileStream(_filename, FileMode.Create, FileAccess.ReadWrite, FileShare.Read,
WriteBufferSize, FileOptions.SequentialScan);
var writer = new BinaryWriter(stream);
stream.SetLength(chunkHeader.ChunkSize + ChunkHeader.Size + ChunkFooter.Size);
WriteHeader(md5, stream, chunkHeader);
_writerWorkItem = new WriterWorkItem(stream, writer, md5);
Flush();
}
private void CreateWriterWorkItemForExistingChunk(int writePosition, out ChunkHeader chunkHeader)
{
var md5 = MD5.Create();
var stream = new FileStream(_filename, FileMode.Open, FileAccess.ReadWrite, FileShare.Read,
WriteBufferSize, FileOptions.SequentialScan);
var writer = new BinaryWriter(stream);
try
{
chunkHeader = ReadHeader(stream);
}
catch
{
stream.Dispose();
((IDisposable)md5).Dispose();
throw;
}
var realPosition = GetRealPosition(writePosition, inMemory: false);
stream.Position = realPosition;
MD5Hash.ContinuousHashFor(md5, stream, 0, realPosition);
_writerWorkItem = new WriterWorkItem(stream, writer, md5);
}
private void CloseWriterStream()
{
if (_writerWorkItem == null)
return;
if (_writerWorkItem.Stream != null)
_writerWorkItem.Stream.Dispose();
var unmanagedStream = _writerWorkItem.UnmanagedMemoryStream;
if (unmanagedStream != null)
{
unmanagedStream.Dispose();
_writerWorkItem.UnmanagedMemoryStream = null;
}
_writerWorkItem = null;
}
private static int GetLogicalPosition(WriterWorkItem workItem)
{
return (int) workItem.Stream.Position - ChunkHeader.Size;
}
private static int GetLogicalPosition(WriterWorkItem workItem)
{
return((int)workItem.Stream.Position - ChunkHeader.Size);
}
