code: def _header_bytefmt_byteorder(geom_type, num_dims, big_endian, meta=None):
      
      dim = _INT_TO_DIM_LABEL.get(num_dims)
      if dim is None:
          pass  # TODO: raise
  
      type_byte_str = _WKB[dim][geom_type]
      srid = meta.get('srid')
      if srid is not None:
          # Add the srid flag
          type_byte_str = SRID_FLAG + type_byte_str[1:]
  
      if big_endian:
          header = BIG_ENDIAN
          byte_fmt = b'>'
          byte_order = '>'
      else:
          header = LITTLE_ENDIAN
          byte_fmt = b'<'
          byte_order = '<'
          # reverse the byte ordering for little endian
          type_byte_str = type_byte_str[::-1]
  
      header += type_byte_str
      if srid is not None:
          srid = int(srid)
  
          if big_endian:
              srid_header = struct.pack('>i', srid)
          else:
              srid_header = struct.pack('<i', srid)
          header += srid_header
      byte_fmt += b'd' * num_dims
  
      return header, byte_fmt, byte_order
docs: Utility function to get the WKB header (endian byte + type header), byte
      format string, and byte order string.