delta.h

   1 extern void *diff_delta(void *from_buf, unsigned long from_size,
   2                         void *to_buf, unsigned long to_size,
   3                         unsigned long *delta_size);
   4 extern void *patch_delta(void *src_buf, unsigned long src_size,
   5                          void *delta_buf, unsigned long delta_size,
   6                          unsigned long *dst_size);