Allow default core.logallrefupdates to be overridden with template's config
[git/git.git] / pack.h
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1#ifndef PACK_H
2#define PACK_H
3
1974632c 4#include "object.h"
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5
6/*
7 * Packed object header
8 */
9#define PACK_SIGNATURE 0x5041434b /* "PACK" */
29f049a0 10#define PACK_VERSION 2
d60fc1c8 11#define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3))
a733cb60 12struct pack_header {
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13 uint32_t hdr_signature;
14 uint32_t hdr_version;
15 uint32_t hdr_entries;
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16};
17
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18/*
19 * Packed object index header
20 *
21 * struct pack_idx_header {
22 * uint32_t idx_signature;
23 * uint32_t idx_version;
24 * };
25 *
26 * Note: this header isn't active yet. In future versions of git
27 * we may change the index file format. At that time we would start
28 * the first four bytes of the new index format with this signature,
29 * as all older git binaries would find this value illegal and abort
30 * reading the file.
31 *
32 * This is the case because the number of objects in a packfile
33 * cannot exceed 1,431,660,000 as every object would need at least
34 * 3 bytes of data and the overall packfile cannot exceed 4 GiB due
35 * to the 32 bit offsets used by the index. Clearly the signature
36 * exceeds this maximum.
37 *
38 * Very old git binaries will also compare the first 4 bytes to the
39 * next 4 bytes in the index and abort with a "non-monotonic index"
40 * error if the second 4 byte word is smaller than the first 4
41 * byte word. This would be true in the proposed future index
42 * format as idx_signature would be greater than idx_version.
43 */
44#define PACK_IDX_SIGNATURE 0xff744f63 /* "\377tOc" */
45
f3bf9224 46extern int verify_pack(struct packed_git *, int);
a733cb60 47#endif