306     _file = None  # Set here since __del__ checks it  variable in Aifc_read
313         self._file = file
328                 chunk = Chunk(self._file)
369         return self._file
376         file = self._file
378             self._file = None
552     _file = None  # Set here since __del__ checks it  variable in Aifc_write
571         self._file = file
726         self._file.write(data)
737         if self._file is None:
743                 self._file.write(b'\x00')
753             f = self._file
754             self._file = None
803         self._file.write(b'FORM')
819             self._form_length_pos = self._file.tell()
824             self._file.write(b'AIFC')
825             self._file.write(b'FVER')
826             _write_ulong(self._file, 4)
827             _write_ulong(self._file, self._version)
829             self._file.write(b'AIFF')
830         self._file.write(b'COMM')
831         _write_ulong(self._file, commlength)
832         _write_short(self._file, self._nchannels)
834             self._nframes_pos = self._file.tell()
835         _write_ulong(self._file, self._nframes)
837             _write_short(self._file, 8)
839             _write_short(self._file, self._sampwidth * 8)
840         _write_float(self._file, self._framerate)
842             self._file.write(self._comptype)
843             _write_string(self._file, self._compname)
844         self._file.write(b'SSND')
846             self._ssnd_length_pos = self._file.tell()
847         _write_ulong(self._file, self._datalength + 8)
848         _write_ulong(self._file, 0)
849         _write_ulong(self._file, 0)
860         _write_ulong(self._file, 4 + verslength + self._marklength + \
865         curpos = self._file.tell()
868             self._file.write(b'\x00')
874             self._file.seek(curpos, 0)
876         self._file.seek(self._form_length_pos, 0)
878         self._file.seek(self._nframes_pos, 0)
879         _write_ulong(self._file, self._nframeswritten)
880         self._file.seek(self._ssnd_length_pos, 0)
881         _write_ulong(self._file, datalength + 8)
882         self._file.seek(curpos, 0)
889         self._file.write(b'MARK')
896         _write_ulong(self._file, length)
898         _write_short(self._file, len(self._markers))
901             _write_short(self._file, id)
902             _write_ulong(self._file, pos)
903             _write_string(self._file, name)