Return the *length* bytes comprising the encoded string in *bufr* at
        *str_offset* in the strings area beginning at *strings_offset*.

def _raw_name_string(bufr, strings_offset, str_offset, length):
        """
        Return the *length* bytes comprising the encoded string in *bufr* at
        *str_offset* in the strings area beginning at *strings_offset*.
        """
        offset = strings_offset + str_offset
        tmpl = '%ds' % length
        return unpack_from(tmpl, bufr, offset)[0]