4 /* handling of delta buffers */
5 extern void *diff_delta(void *from_buf, unsigned long from_size,
6 void *to_buf, unsigned long to_size,
7 unsigned long *delta_size, unsigned long max_size);
8 extern void *patch_delta(void *src_buf, unsigned long src_size,
9 void *delta_buf, unsigned long delta_size,
10 unsigned long *dst_size);
12 /* the smallest possible delta size is 4 bytes */
13 #define DELTA_SIZE_MIN 4
16 * This must be called twice on the delta data buffer, first to get the
17 * expected reference buffer size, and again to get the result buffer size.
19 static inline unsigned long get_delta_hdr_size(const unsigned char **datap)
21 const unsigned char *data = *datap;
22 unsigned char cmd = *data++;
23 unsigned long size = cmd & ~0x80;
27 size |= (cmd & ~0x80) << i;