public override IEnumerable <StreamExtent> GetExtentsInRange(long start, long count)
{
CheckDisposed();
return
(StreamExtent.Intersect(
StreamExtent.Union(GetExtentsRaw(start, count), _parentStream.GetExtentsInRange(start, count)),
new StreamExtent(start, count)));
}
public override IEnumerable <StreamExtent> GetExtentsInRange(long start, long count)
{
CheckDisposed();
long maxCount = Math.Min(Length, start + count) - start;
if (maxCount < 0)
{
return(new StreamExtent[0]);
}
IEnumerable <StreamExtent> parentExtents = _parentStream.GetExtentsInRange(start, maxCount);
IEnumerable <StreamExtent> result = StreamExtent.Union(LayerExtents(start, maxCount), parentExtents);
result = StreamExtent.Intersect(result, new[] { new StreamExtent(start, maxCount) });
return(result);
}
public void Extents()
{
SparseMemoryStream memStream = new SparseMemoryStream(new SparseMemoryBuffer(1), FileAccess.ReadWrite);
memStream.SetLength(1024);
ThreadSafeStream tss = new ThreadSafeStream(memStream);
SparseStream altView = tss.OpenView();
tss.Position = 100;
tss.WriteByte(99);
List <StreamExtent> extents = new List <StreamExtent>(altView.Extents);
Assert.Equal(1, extents.Count);
Assert.Equal(100, extents[0].Start);
Assert.Equal(1, extents[0].Length);
extents = new List <StreamExtent>(altView.GetExtentsInRange(10, 300));
Assert.Equal(1, extents.Count);
Assert.Equal(100, extents[0].Start);
Assert.Equal(1, extents[0].Length);
}
