code: def _parse_coc_segment(self, fptr):
          
          kwargs = {}
          offset = fptr.tell() - 2
          kwargs['offset'] = offset
  
          read_buffer = fptr.read(2)
          length, = struct.unpack('>H', read_buffer)
          kwargs['length'] = length
  
          fmt = '>B' if self._csiz <= 255 else '>H'
          nbytes = 1 if self._csiz <= 255 else 2
          read_buffer = fptr.read(nbytes)
          ccoc, = struct.unpack(fmt, read_buffer)
  
          read_buffer = fptr.read(1)
          scoc, = struct.unpack('>B', read_buffer)
  
          numbytes = offset + 2 + length - fptr.tell()
          read_buffer = fptr.read(numbytes)
          spcoc = np.frombuffer(read_buffer, dtype=np.uint8)
          spcoc = spcoc
  
          return COCsegment(ccoc, scoc, spcoc, length, offset)
docs: Parse the COC marker segment.
  
          Parameters
          ----------
          fptr : file
              Open file object.
  
          Returns
          -------
          COCSegment
              The current COC segment.