LENGTH_SIZE
bcopy(tdatap, (caddr_t)&sp->length, LENGTH_SIZE);
tdatap += LENGTH_SIZE;
bcopy(tdatap, (caddr_t)&sp->length, LENGTH_SIZE);
tdatap += LENGTH_SIZE;
bcopy((caddr_t)&segp->length, tdatap, LENGTH_SIZE);
LENGTH_SIZE + PROTECTED_SIZE + VERSION_SIZE)
DESCRIPTOR_SIZE + OFFSET_SIZE + LENGTH_SIZE)