checkStatus(h, buf, "mark", 20, 20, true, 10, 10);
buf.position(15);
checkStatus(h, buf, "mark", 20, 20, true, 5, 15);
h.check(buf.reset(), buf, "mark: buf.reset()");
checkStatus(h, buf, "mark", 20, 20, true, 10, 10);
buf.position(16);
checkStatus(h, buf, "mark", 20, 20, true, 4, 16);
buf.reset();
checkStatus(h, buf, "mark", 20, 20, true, 10, 10);
// mark at specified position