code: def saveData(self, file, data):
      if hasattr(self.__class__, "encodeData"):
          data = self.encodeData(data)
      self.length = len(data)
      file.seek(self.offset)
      file.write(data)
  
imports: from io import BytesIO
  from types import SimpleNamespace
  from fontTools.misc.textTools import Tag
  from fontTools.misc import sstruct
  from fontTools.ttLib import TTLibError, TTLibFileIsCollectionError
  import struct
  from collections import OrderedDict
  import logging
label_desc: Use image node_id 7 for calling the DirectoryEntry obj's underlying member method code with example usage: obj.saveData(file, data) without return types