Method getHunk

src/common/classes/alloc.cpp:326–332

	}

	MemMediumHunk* getHunk()
	{
		fb_assert(!(hdrLength & MEM_HUGE));
		off_t offset = hdrLength >> OFFSET_SHIFT;
		fb_assert(offset > 0);
		return (MemMediumHunk*)(((UCHAR*)this) - offset);
	}

	void setRedirect()
	{