class_docstr: Base object for reading mat files
  
  To make this class functional, you will need to override the
  following methods:
  
  matrix_getter_factory   - gives object to fetch next matrix from stream
  guess_byte_order        - guesses file byte order from file
code: def end_of_stream(self):
      b = self.mat_stream.read(1)
      curpos = self.mat_stream.tell()
      self.mat_stream.seek(curpos - 1)
      return len(b) == 0
  
imports: import numpy
  from scipy._lib import doccer
  from .None import _byteordercodes
label_desc: Use image node_id 4 for calling the MatFileReader obj's underlying member method code with example usage: obj.end_of_stream() and returns: unknown