class_docstr: Reader for Mat 5 mat files
  Adds the following attribute to base class
  
  uint16_codec - char codec to use for uint16 char arrays
      (defaults to system default codec)
  
  Uses variable reader that has the following standard interface (see
  abstract class in ``miobase``::
  
     __init__(self, file_reader)
     read_header(self)
     array_from_header(self)
  
  and added interface::
  
     set_stream(self, stream)
     read_full_tag(self)
docstr: Guess byte order.
  Sets stream pointer to 0
docstr_tok: ["Guess","byte","order",".","Sets","stream","pointer","to","0"]
code: def guess_byte_order(self):
      """Guess byte order.
      Sets stream pointer to 0"""
      self.mat_stream.seek(126)
      mi = self.mat_stream.read(2)
      self.mat_stream.seek(0)
      return mi == b"IM" and "<" or ">"
  
imports: import os
  import time
  import sys
  import zlib
  from io import BytesIO
  import warnings
  import numpy
  import scipy.sparse
  from ._byteordercodes import native_code, swapped_code
  from ._miobase import MatFileReader, docfiller, matdims, read_dtype, arr_to_chars, arr_dtype_number, MatWriteError, MatReadError, MatReadWarning
  from ._mio5_utils import VarReader5
  from ._mio5_params import MatlabObject, MatlabFunction, MDTYPES, NP_TO_MTYPES, NP_TO_MXTYPES, miCOMPRESSED, miMATRIX, miINT8, miUTF8, miUINT32, mxCELL_CLASS, mxSTRUCT_CLASS, mxOBJECT_CLASS, mxCHAR_CLASS, mxSPARSE_CLASS, mxDOUBLE_CLASS, mclass_info, mat_struct
  from ._streams import ZlibInputStream
label_desc: Use image node_id 2 for calling the MatFile5Reader obj's underlying member method code with example usage: obj.guess_byte_order() and returns: unknown