public IKSoftStreamWithVirtualBufferAndBookmark(IKSoftStreamWithVirtualBuffer stream, long bufferLength)
{
Contract.Requires(stream != null);
mBookmark = stream.EnterVirtualBufferBookmark();
mCleanup = stream.EnterVirtualBuffer(bufferLength);
mDisposed = false;
}
public IKSoftStreamWithVirtualBufferBookmark(IKSoftStreamWithVirtualBuffer stream)
{
Contract.Requires(stream != null);
mStream = stream;
mOldStart = stream.VirtualBufferStart;
mOldLength = stream.VirtualBufferLength;
}
public IKSoftStreamWithVirtualBufferCleanup(IKSoftStreamWithVirtualBuffer stream)
{
Contract.Requires(stream != null);
Contract.Requires(stream.VirtualBufferStart > 0 && stream.VirtualBufferLength > 0);
mStream = stream;
mBufferEnd = stream.VirtualBufferStart + stream.VirtualBufferLength;
}
/// <summary>Restores the VirtualBuffer properties of the underlying stream to their previous values</summary>
public void Dispose()
{
if (mStream != null)
{
mStream.VirtualBufferStart = mOldStart;
mStream.VirtualBufferLength = mOldLength;
mStream = null;
}
}
/// <summary>
/// If the stream position is still inside the virtual buffer, seeks to the VirtualBuffer 'end'.
/// Sets the VirtualBuffer properties of the underlying stream to 0.
/// </summary>
public void Dispose()
{
if (mStream != null)
{
long leftovers = mBufferEnd - mStream.BaseStream.Position;
if (leftovers > 0)
{
mStream.BaseStream.Seek(leftovers, SeekOrigin.Current);
}
mStream.VirtualBufferStart = mStream.VirtualBufferLength = 0;
mStream = null;
}
}
