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c7c9e183 | 1 | /* |
bb742ede | 2 | * Copyright (C) 2009-2011 the libgit2 contributors |
c7c9e183 | 3 | * |
bb742ede VM |
4 | * This file is part of libgit2, distributed under the GNU GPL v2 with |
5 | * a Linking Exception. For full terms see the included COPYING file. | |
c7c9e183 CMN |
6 | */ |
7 | ||
8 | #ifndef INCLUDE_pack_h__ | |
9 | #define INCLUDE_pack_h__ | |
10 | ||
11 | #include "git2/oid.h" | |
12 | ||
13 | #include "common.h" | |
14 | #include "map.h" | |
15 | #include "mwindow.h" | |
7d0cdf82 | 16 | #include "odb.h" |
c7c9e183 CMN |
17 | |
18 | #define PACK_SIGNATURE 0x5041434b /* "PACK" */ | |
19 | #define PACK_VERSION 2 | |
20 | #define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3)) | |
a070f152 | 21 | struct git_pack_header { |
c7c9e183 CMN |
22 | uint32_t hdr_signature; |
23 | uint32_t hdr_version; | |
24 | uint32_t hdr_entries; | |
25 | }; | |
26 | ||
27 | /* | |
28 | * The first four bytes of index formats later than version 1 should | |
29 | * start with this signature, as all older git binaries would find this | |
30 | * value illegal and abort 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 with | |
35 | * version 1 of the index file due to the offsets limited to 32 bits. | |
36 | * Clearly the signature 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 | |
87d9869f | 41 | * byte word. This would be true in the proposed future index |
c7c9e183 CMN |
42 | * format as idx_signature would be greater than idx_version. |
43 | */ | |
44 | ||
45 | #define PACK_IDX_SIGNATURE 0xff744f63 /* "\377tOc" */ | |
46 | ||
a070f152 | 47 | struct git_pack_idx_header { |
c7c9e183 CMN |
48 | uint32_t idx_signature; |
49 | uint32_t idx_version; | |
50 | }; | |
51 | ||
a070f152 | 52 | struct git_pack_file { |
c7c9e183 | 53 | git_mwindow_file mwf; |
c7c9e183 CMN |
54 | git_map index_map; |
55 | ||
56 | uint32_t num_objects; | |
57 | uint32_t num_bad_objects; | |
58 | git_oid *bad_object_sha1; /* array of git_oid */ | |
59 | ||
60 | int index_version; | |
61 | git_time_t mtime; | |
c1af5a39 | 62 | unsigned pack_local:1, pack_keep:1, has_cache:1; |
c7c9e183 | 63 | git_oid sha1; |
c1af5a39 | 64 | git_vector cache; |
c7c9e183 CMN |
65 | |
66 | /* something like ".git/objects/pack/xxxxx.pack" */ | |
67 | char pack_name[GIT_FLEX_ARRAY]; /* more */ | |
68 | }; | |
69 | ||
a070f152 | 70 | struct git_pack_entry { |
c7c9e183 CMN |
71 | off_t offset; |
72 | git_oid sha1; | |
a070f152 | 73 | struct git_pack_file *p; |
c7c9e183 CMN |
74 | }; |
75 | ||
7d0cdf82 CMN |
76 | int git_packfile_unpack_header( |
77 | size_t *size_p, | |
78 | git_otype *type_p, | |
79 | git_mwindow_file *mwf, | |
80 | git_mwindow **w_curs, | |
81 | off_t *curpos); | |
82 | ||
b5b474dd | 83 | int git_packfile_unpack(git_rawobj *obj, struct git_pack_file *p, off_t *obj_offset); |
7d0cdf82 | 84 | |
a070f152 | 85 | off_t get_delta_base(struct git_pack_file *p, git_mwindow **w_curs, |
7d0cdf82 CMN |
86 | off_t *curpos, git_otype type, |
87 | off_t delta_obj_offset); | |
88 | ||
a070f152 CMN |
89 | void packfile_free(struct git_pack_file *p); |
90 | int git_packfile_check(struct git_pack_file **pack_out, const char *path); | |
91 | int git_pack_entry_find( | |
92 | struct git_pack_entry *e, | |
93 | struct git_pack_file *p, | |
94 | const git_oid *short_oid, | |
95 | unsigned int len); | |
96 | ||
c7c9e183 | 97 | #endif |