for ($j = 0; $j < $n; ++$j) {
                    TrFctMessage(__FILE__, __LINE__, 3, 'Read complete 512 bytes block number ' . ($j + 1));
                    if ('tar' === $p_tar_mode) {
                        $v_content = fread($v_tar, 512);
                        fwrite($v_temp_tar, $v_content, 512);