Merge branch 'fix'
[git/git.git] / delta.h
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1#ifndef DELTA_H
2#define DELTA_H
3
4/* handling of delta buffers */
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5extern void *diff_delta(void *from_buf, unsigned long from_size,
6 void *to_buf, unsigned long to_size,
75c42d8c 7 unsigned long *delta_size, unsigned long max_size);
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8extern void *patch_delta(void *src_buf, unsigned long src_size,
9 void *delta_buf, unsigned long delta_size,
10 unsigned long *dst_size);
d1af002d 11
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12/* the smallest possible delta size is 4 bytes */
13#define DELTA_SIZE_MIN 4
14
15/*
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.
18 */
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19static inline unsigned long get_delta_hdr_size(const unsigned char **datap,
20 const unsigned char *top)
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21{
22 const unsigned char *data = *datap;
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23 unsigned char cmd;
24 unsigned long size = 0;
25 int i = 0;
26 do {
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27 cmd = *data++;
28 size |= (cmd & ~0x80) << i;
29 i += 7;
8960844a 30 } while (cmd & 0x80 && data < top);
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31 *datap = data;
32 return size;
33}
34
d1af002d 35#endif