internal VirtualStream(VirtualStreamContainer stream, long stream_offset, long offset, long length)
{
m_stream = stream;
m_offset = offset;
m_length = length;
m_stream_offset = stream_offset;
m_stream.Container.Stream.Position = m_offset - m_stream_offset;
}
public new void Dispose()
{
//remove this stream from its container.
m_stream.Container.MappedStreams.Remove(m_stream);
m_stream = null;
}
/// <summary>
/// Create a VirtualStream
/// </summary>
/// <param name="offset">absolute offset</param>
/// <param name="length">length of virtual stream</param>
/// <returns>VirtualStream instance</returns>
public VirtualStream CreateStream(long offset, long length)
{
var range = new Range<Int64> { Minimum = offset, Maximum = offset + length };
//look for views in that size
var stream = GetStreamByRange(range);
if (stream != null)
{
Statistics.NumberOfStreamReuse++;
//if found, create MappedViewContainer
var mappedStreamContainer = new VirtualStreamContainer { Container = stream, Range = range };
mappedStreamContainer.MappedStream = new VirtualStream(mappedStreamContainer,stream.Range.Minimum, offset, length);
stream.MappedStreams.Add(mappedStreamContainer);
//ClearUnusedMappings();
return mappedStreamContainer.MappedStream;
}
//if not found, create view, create MappedViewContainer
var maximized = GetMaximizedRange(offset, length);
var container = new MemoryMappedStreamContainer();
container.Range = maximized;
container.MemoryMapper = this;
//container.Stream = m_mmf.CreateViewStream(maximized.Minimum, maximized.Maximum - maximized.Minimum, MemoryMappedFileAccess.ReadWrite);
m_streams.Add(container);
Statistics.NumberOfStreamCreates++;
//recursively get view (no reason to implement logic twice, only for optimizations)
return CreateStream(offset, length);
}