Fix BasicStream offset when with_data=False

edosl0util/stream.py

@@ -100,6 +100,7 @@ class BasicStream(object):
         else:
             data = None
             self.file.seek(data_size, os.SEEK_CUR)
+            self._offset += data_size
         return self.Tracker(h1, h2, total_size, offset, data)