read two chunks, to prevent failure on edges
read two chunks, to prevent failure on edges

git-svn-id: 1b0a423fe9d79f2fed96b494a1a4ef418e3b8bc0@28 0e20359e-2163-43f9-affa-fa36fe899960

j4cbo/stilts,j4cbo/stilts,j4cbo/stilts,j4cbo/stilts