/// <summary>
/// Sets the length of the stream.
/// </summary>
/// <param name="value">The new length.</param>
public override void SetLength(long value)
{
CheckFrozen();
if (_diffStream != null)
{
_diffStream.SetLength(value);
}
else
{
_baseStream.SetLength(value);
}
}
/// <summary>
/// Takes a snapshot of the current stream contents.
/// </summary>
public void Snapshot()
{
if (_diffStream != null)
{
throw new InvalidOperationException("Already have a snapshot");
}
_savedPosition = _position;
_diffExtents = new List <StreamExtent>();
_diffStream = new SparseMemoryStream();
_diffStream.SetLength(_baseStream.Length);
}