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1 | #ifndef PACK_H | |
2 | #define PACK_H | |
3 | ||
4 | #include "object.h" | |
5 | ||
6 | /* | |
7 | * Packed object header | |
8 | */ | |
9 | #define PACK_SIGNATURE 0x5041434b /* "PACK" */ | |
10 | #define PACK_VERSION 2 | |
11 | #define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3)) | |
12 | struct pack_header { | |
13 | uint32_t hdr_signature; | |
14 | uint32_t hdr_version; | |
15 | uint32_t hdr_entries; | |
16 | }; | |
17 | ||
18 | /* | |
19 | * The first four bytes of index formats later than version 1 should | |
20 | * start with this signature, as all older git binaries would find this | |
21 | * value illegal and abort reading the file. | |
22 | * | |
23 | * This is the case because the number of objects in a packfile | |
24 | * cannot exceed 1,431,660,000 as every object would need at least | |
25 | * 3 bytes of data and the overall packfile cannot exceed 4 GiB with | |
26 | * version 1 of the index file due to the offsets limited to 32 bits. | |
27 | * Clearly the signature exceeds this maximum. | |
28 | * | |
29 | * Very old git binaries will also compare the first 4 bytes to the | |
30 | * next 4 bytes in the index and abort with a "non-monotonic index" | |
31 | * error if the second 4 byte word is smaller than the first 4 | |
32 | * byte word. This would be true in the proposed future index | |
33 | * format as idx_signature would be greater than idx_version. | |
34 | */ | |
35 | #define PACK_IDX_SIGNATURE 0xff744f63 /* "\377tOc" */ | |
36 | ||
37 | struct pack_idx_option { | |
38 | unsigned flags; | |
39 | /* flag bits */ | |
40 | #define WRITE_IDX_VERIFY 01 | |
41 | ||
42 | uint32_t version; | |
43 | uint32_t off32_limit; | |
44 | ||
45 | /* | |
46 | * List of offsets that would fit within off32_limit but | |
47 | * need to be written out as 64-bit entity for byte-for-byte | |
48 | * verification. | |
49 | */ | |
50 | int anomaly_alloc, anomaly_nr; | |
51 | uint32_t *anomaly; | |
52 | }; | |
53 | ||
54 | extern void reset_pack_idx_option(struct pack_idx_option *); | |
55 | ||
56 | /* | |
57 | * Packed object index header | |
58 | */ | |
59 | struct pack_idx_header { | |
60 | uint32_t idx_signature; | |
61 | uint32_t idx_version; | |
62 | }; | |
63 | ||
64 | /* | |
65 | * Common part of object structure used for write_idx_file | |
66 | */ | |
67 | struct pack_idx_entry { | |
68 | unsigned char sha1[20]; | |
69 | uint32_t crc32; | |
70 | off_t offset; | |
71 | }; | |
72 | ||
73 | extern const char *write_idx_file(const char *index_name, struct pack_idx_entry **objects, int nr_objects, const struct pack_idx_option *, unsigned char *sha1); | |
74 | extern int check_pack_crc(struct packed_git *p, struct pack_window **w_curs, off_t offset, off_t len, unsigned int nr); | |
75 | extern int verify_pack_index(struct packed_git *); | |
76 | extern int verify_pack(struct packed_git *); | |
77 | extern void fixup_pack_header_footer(int, unsigned char *, const char *, uint32_t, unsigned char *, off_t); | |
78 | extern char *index_pack_lockfile(int fd); | |
79 | extern int encode_in_pack_object_header(enum object_type, uintmax_t, unsigned char *); | |
80 | ||
81 | #define PH_ERROR_EOF (-1) | |
82 | #define PH_ERROR_PACK_SIGNATURE (-2) | |
83 | #define PH_ERROR_PROTOCOL (-3) | |
84 | extern int read_pack_header(int fd, struct pack_header *); | |
85 | #endif |