mng_read_box     5269 coders/png.c                       mng_read_box(mng_info->frame,0, &p[12]);
mng_read_box     5548 coders/png.c                           fb=mng_read_box(previous_fb,(char) p[0],&p[1]);
mng_read_box     5656 coders/png.c                              mng_read_box(box,(char) p[0],&p[1]);