code: private ReadStream openRead(long address, int size)
    {
      InStore inStore = _store.openRead(address, size);
      
      InStoreStream is = new InStoreStream(inStore, address, address + size);
      
      return new ReadStream(new VfsStream(is));
    }
docs: Open a read stream to a segment.
  
  @param address file address for the segment
  @param size length of the segment
  
  @return opened ReadStream