/// <summary>
/// Creates a <see cref="BinaryStream"/> that is at position 0 of the provided stream.
/// </summary>
/// <param name="stream">The base stream to use.</param>
/// <param name="leaveOpen">Determines if the underlying stream will automatically be
/// disposed of when this class has it's dispose method called.</param>
public BinaryStream(ISupportsBinaryStream stream, bool leaveOpen = true)
{
m_args = new BlockArguments();
m_leaveOpen = leaveOpen;
m_stream = stream;
FirstPosition = 0;
Current = null;
First = null;
LastRead = null;
LastWrite = null;
if (stream.RemainingSupportedIoSessions < 1)
{
throw new Exception("Stream has run out of read sessions");
}
m_mainIoSession = stream.CreateIoSession();
//if (stream.RemainingSupportedIoSessions >= 1)
// m_secondaryIoSession = stream.CreateIoSession();
}
/// <summary>
/// Creates a new DiskIoSession that can be used to read from the disk subsystem.
/// </summary>
/// <param name="diskIo">owner of the disk</param>
/// <param name="ioSession">the base ioSession to use for this io session</param>
/// <param name="file">The file that will be read from this diskIoSession</param>
public DiskIoSession(DiskIo diskIo, BinaryStreamIoSessionBase ioSession, FileHeaderBlock header, SubFileHeader file)
{
if (diskIo == null)
throw new ArgumentNullException("diskIo");
if (diskIo.IsDisposed)
throw new ObjectDisposedException(diskIo.GetType().FullName);
if (ioSession == null)
throw new ArgumentNullException("ioSession");
if (file == null)
throw new ArgumentNullException("file");
m_args = new BlockArguments();
m_lastReadonlyBlock = diskIo.LastReadonlyBlock;
m_diskMediumIoSession = ioSession;
m_snapshotSequenceNumber = header.SnapshotSequenceNumber;
m_fileIdNumber = file.FileIdNumber;
m_isReadOnly = file.IsReadOnly | diskIo.IsReadOnly;
m_blockSize = diskIo.BlockSize;
m_diskIo = diskIo;
IsValid = false;
IsDisposed = false;
}
protected override void Dispose(bool disposing)
{
if (!m_disposed)
{
try
{
// This will be done regardless of whether the object is finalized or disposed.
if (m_mainIoSession != null)
{
m_mainIoSession.Dispose();
}
if (m_secondaryIoSession != null)
{
m_secondaryIoSession.Dispose();
}
if (!m_leaveOpen && m_stream != null)
{
m_stream.Dispose();
}
}
finally
{
FirstPosition = 0;
LastPosition = 0;
Current = null;
First = null;
LastRead = null;
LastWrite = null;
m_mainIoSession = null;
m_secondaryIoSession = null;
m_stream = null;
m_disposed = true;
}
}
base.Dispose(disposing);
}
/// <summary>
/// Aquire an IO Session.
/// </summary>
BinaryStreamIoSessionBase ISupportsBinaryStream.CreateIoSession()
{
if (m_disposed)
throw new ObjectDisposedException(GetType().FullName);
if (RemainingSupportedIoSessions == 0)
throw new Exception("There are not any remaining IO Sessions");
m_ioStream1 = new SimplifiedSubFileStreamIoSession(m_stream, m_subFile, m_fileHeaderBlock);
return m_ioStream1;
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
/// <filterpriority>2</filterpriority>
public void Dispose()
{
if (!m_disposed)
{
try
{
if (m_ioStream1 != null)
{
m_ioStream1.Dispose();
m_ioStream1 = null;
}
}
finally
{
m_disposed = true; // Prevent duplicate dispose.
}
}
}
/// <summary>
/// Releases all the resources used by the <see cref="DiskIoSession"/> object.
/// </summary>
public void Dispose()
{
if (!IsDisposed)
{
try
{
if (m_diskMediumIoSession != null)
{
m_diskMediumIoSession.Dispose();
m_diskMediumIoSession = null;
}
m_diskIo = null;
}
finally
{
GC.SuppressFinalize(this);
IsValid = false;
IsDisposed = true; // Prevent duplicate dispose.
}
}
}
/// <summary>
/// Creates a <see cref="BinaryStream"/> that is at position 0 of the provided stream.
/// </summary>
/// <param name="stream">The base stream to use.</param>
/// <param name="leaveOpen">Determines if the underlying stream will automatically be
/// disposed of when this class has it's dispose method called.</param>
public BinaryStream(ISupportsBinaryStream stream, bool leaveOpen = true)
{
m_args = new BlockArguments();
m_leaveOpen = leaveOpen;
m_stream = stream;
FirstPosition = 0;
Current = null;
First = null;
LastRead = null;
LastWrite = null;
if (stream.RemainingSupportedIoSessions < 1)
throw new Exception("Stream has run out of read sessions");
m_mainIoSession = stream.CreateIoSession();
//if (stream.RemainingSupportedIoSessions >= 1)
// m_secondaryIoSession = stream.CreateIoSession();
}
protected override void Dispose(bool disposing)
{
if (!m_disposed)
{
try
{
// This will be done regardless of whether the object is finalized or disposed.
if (m_mainIoSession != null)
m_mainIoSession.Dispose();
if (m_secondaryIoSession != null)
m_secondaryIoSession.Dispose();
if (!m_leaveOpen && m_stream != null)
m_stream.Dispose();
}
finally
{
FirstPosition = 0;
LastPosition = 0;
Current = null;
First = null;
LastRead = null;
LastWrite = null;
m_mainIoSession = null;
m_secondaryIoSession = null;
m_stream = null;
m_disposed = true;
}
}
base.Dispose(disposing);
}
/// <summary>
/// Aquire an IO Session.
/// </summary>
BinaryStreamIoSessionBase ISupportsBinaryStream.CreateIoSession()
{
if (m_disposed)
throw new ObjectDisposedException(GetType().FullName);
if (RemainingSupportedIoSessions == 0)
throw new Exception("There are not any remaining IO Sessions");
BinaryStreamIoSessionBase session;
if (m_fileHeaderBlock.IsSimplifiedFileFormat)
{
session = new SimplifiedIoSession(this);
}
else
{
session = new IoSession(this);
}
if (m_ioStream1 == null || m_ioStream1.IsDisposed)
{
m_ioStream1 = session;
}
else
{
m_ioStream2 = session;
}
return session;
}
