code: def write_dir(dbfile, basepos, directory, options=None):
      options = options or {}
  
      dirpos = dbfile.tell()  # Remember the start of the directory
      dbfile.write_pickle(directory)  # Write the directory
      dbfile.write_pickle(options)
      endpos = dbfile.tell()  # Remember the end of the directory
      dbfile.flush()
      dbfile.seek(basepos)  # Seek back to the start
      dbfile.write_long(dirpos)  # Directory position
      dbfile.write_int(endpos - dirpos)  # Directory length
  
      dbfile.close()
  
imports: import errno
  import os
  import sys
  from threading import Lock
  from shutil import copyfileobj
  from whoosh.compat import BytesIO, memoryview_
  from whoosh.filedb.structfile import BufferFile, StructFile
  from whoosh.filedb.filestore import FileStorage, StorageError
  from whoosh.system import emptybytes
  from whoosh.util import random_name
label_desc: Use image node_id 12 for calling the CompoundStorage obj's underlying member method code with example usage: obj.write_dir(dbfile, basepos, directory, options) without return types