def _read_binary(self, size=<NUM_LIT:1>):
bin_ = '<STR_LIT>'<EOL>for _ in range(size):<EOL><INDENT>byte = self._file.read(<NUM_LIT:1>)<EOL>bin_ += bin(ord(byte))[<NUM_LIT:2>:].zfill(<NUM_LIT:8>)<EOL><DEDENT>return bin_<EOL>
Read bytes and convert into binaries.

        Positional arguments:
            * size  -- int, buffer size (default is 1)

        Returns:
            * str -- binary bits (0/1)