class_docstr: A small helper class to read fields stored in JPEG2000 header boxes
  and to easily step into and read sub-boxes.
class_docstr_tok: ["A","small","helper","class","to","read","fields","stored","in","JPEG2000","header","boxes","and","to","easily","step","into","and","read","sub-boxes","."]
code: def read_boxes(self):
      size = self.remaining_in_box
      data = self._read_bytes(size)
      return BoxReader(io.BytesIO(data), size)
  
imports: import io
  import os
  import struct
  from .None import Image, ImageFile, _binary
label_desc: Use image node_id 5 for calling the BoxReader obj's underlying member method code with example usage: obj.read_boxes() and returns: BoxReader