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e83c5163 LT |
1 | #ifndef CACHE_H |
2 | #define CACHE_H | |
3 | ||
2dee0609 | 4 | #include <unistd.h> |
e83c5163 LT |
5 | #include <stdio.h> |
6 | #include <sys/stat.h> | |
7 | #include <fcntl.h> | |
8 | #include <stddef.h> | |
9 | #include <stdlib.h> | |
10 | #include <stdarg.h> | |
bf0c6e83 | 11 | #include <string.h> |
e83c5163 LT |
12 | #include <errno.h> |
13 | #include <sys/mman.h> | |
ccc4feb5 | 14 | #include <netinet/in.h> |
e83c5163 LT |
15 | |
16 | #include <openssl/sha.h> | |
17 | #include <zlib.h> | |
18 | ||
19 | /* | |
20 | * Basic data structures for the directory cache | |
21 | * | |
22 | * NOTE NOTE NOTE! This is all in the native CPU byte format. It's | |
23 | * not even trying to be portable. It's trying to be efficient. It's | |
24 | * just a cache, after all. | |
25 | */ | |
26 | ||
27 | #define CACHE_SIGNATURE 0x44495243 /* "DIRC" */ | |
28 | struct cache_header { | |
ccc4feb5 LT |
29 | unsigned int hdr_signature; |
30 | unsigned int hdr_version; | |
31 | unsigned int hdr_entries; | |
e83c5163 LT |
32 | }; |
33 | ||
34 | /* | |
35 | * The "cache_time" is just the low 32 bits of the | |
36 | * time. It doesn't matter if it overflows - we only | |
37 | * check it for equality in the 32 bits we save. | |
38 | */ | |
39 | struct cache_time { | |
40 | unsigned int sec; | |
41 | unsigned int nsec; | |
42 | }; | |
43 | ||
44 | /* | |
45 | * dev/ino/uid/gid/size are also just tracked to the low 32 bits | |
46 | * Again - this is just a (very strong in practice) heuristic that | |
47 | * the inode hasn't changed. | |
ccc4feb5 LT |
48 | * |
49 | * We save the fields in big-endian order to allow using the | |
50 | * index file over NFS transparently. | |
e83c5163 LT |
51 | */ |
52 | struct cache_entry { | |
ccc4feb5 LT |
53 | struct cache_time ce_ctime; |
54 | struct cache_time ce_mtime; | |
55 | unsigned int ce_dev; | |
56 | unsigned int ce_ino; | |
57 | unsigned int ce_mode; | |
58 | unsigned int ce_uid; | |
59 | unsigned int ce_gid; | |
60 | unsigned int ce_size; | |
e83c5163 | 61 | unsigned char sha1[20]; |
f5cabd13 | 62 | unsigned short ce_flags; |
59c1e249 | 63 | char name[0]; |
e83c5163 LT |
64 | }; |
65 | ||
95fd5bf8 LT |
66 | #define CE_NAMEMASK (0x0fff) |
67 | #define CE_STAGEMASK (0x3000) | |
aee46198 | 68 | #define CE_STAGESHIFT 12 |
95fd5bf8 | 69 | |
aee46198 JH |
70 | #define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT)) |
71 | #define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags)) | |
72 | #define ce_size(ce) cache_entry_size(ce_namelen(ce)) | |
73 | #define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT) | |
74 | ||
e4479470 LT |
75 | #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644) |
76 | #define create_ce_mode(mode) htonl(S_IFREG | ce_permissions(mode)) | |
77 | ||
aee46198 | 78 | #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7) |
f5cabd13 | 79 | |
e83c5163 LT |
80 | const char *sha1_file_directory; |
81 | struct cache_entry **active_cache; | |
82 | unsigned int active_nr, active_alloc; | |
83 | ||
84 | #define DB_ENVIRONMENT "SHA1_FILE_DIRECTORY" | |
4bb04f21 | 85 | #define DEFAULT_DB_ENVIRONMENT ".git/objects" |
e83c5163 | 86 | |
e83c5163 LT |
87 | #define alloc_nr(x) (((x)+16)*3/2) |
88 | ||
734aab75 | 89 | /* Initialize and use the cache information */ |
e83c5163 | 90 | extern int read_cache(void); |
197ee8c9 | 91 | extern int write_cache(int newfd, struct cache_entry **cache, int entries); |
eb38c22f | 92 | extern int cache_name_pos(const char *name, int namelen); |
121481ab | 93 | extern int add_cache_entry(struct cache_entry *ce, int ok_to_add); |
197ee8c9 | 94 | extern int remove_file_from_cache(char *path); |
734aab75 LT |
95 | extern int cache_match_stat(struct cache_entry *ce, struct stat *st); |
96 | ||
97 | #define MTIME_CHANGED 0x0001 | |
98 | #define CTIME_CHANGED 0x0002 | |
99 | #define OWNER_CHANGED 0x0004 | |
100 | #define MODE_CHANGED 0x0008 | |
101 | #define INODE_CHANGED 0x0010 | |
102 | #define DATA_CHANGED 0x0020 | |
e83c5163 LT |
103 | |
104 | /* Return a statically allocated filename matching the sha1 signature */ | |
73134b6d | 105 | extern char *sha1_file_name(const unsigned char *sha1); |
e83c5163 LT |
106 | |
107 | /* Write a memory buffer out to the sha file */ | |
73134b6d | 108 | extern int write_sha1_buffer(const unsigned char *sha1, void *buf, unsigned int size); |
e83c5163 LT |
109 | |
110 | /* Read and unpack a sha1 file into memory, write memory to a sha1 file */ | |
73134b6d | 111 | extern void * map_sha1_file(const unsigned char *sha1, unsigned long *size); |
2ade9340 | 112 | extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size); |
73134b6d | 113 | extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size); |
d6d3f9d0 | 114 | extern int write_sha1_file(char *buf, unsigned len, unsigned char *return_sha1); |
d98b46f8 | 115 | extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size, const char *type); |
e83c5163 LT |
116 | |
117 | /* Convert to/from hex/sha1 representation */ | |
197ee8c9 LT |
118 | extern int get_sha1_hex(const char *hex, unsigned char *sha1); |
119 | extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */ | |
e83c5163 LT |
120 | |
121 | /* General helper functions */ | |
2de381f9 PB |
122 | extern void usage(const char *err); |
123 | extern void die(const char *err, ...); | |
124 | extern int error(const char *err, ...); | |
125 | ||
79517a06 | 126 | extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2); |
e83c5163 | 127 | |
f4913f91 JH |
128 | extern void *read_tree_with_tree_or_commit_sha1(const unsigned char *sha1, |
129 | unsigned long *size, | |
130 | unsigned char *tree_sha1_ret); | |
131 | ||
e83c5163 | 132 | #endif /* CACHE_H */ |