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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> | |
bb233d69 | 14 | #include <sys/param.h> |
ccc4feb5 | 15 | #include <netinet/in.h> |
e83c5163 | 16 | |
cef661fc | 17 | #include SHA1_HEADER |
e83c5163 LT |
18 | #include <zlib.h> |
19 | ||
9da3acfb ET |
20 | #if ZLIB_VERNUM < 0x1200 |
21 | #define deflateBound(c,s) ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11) | |
22 | #endif | |
23 | ||
e83c5163 LT |
24 | /* |
25 | * Basic data structures for the directory cache | |
26 | * | |
27 | * NOTE NOTE NOTE! This is all in the native CPU byte format. It's | |
28 | * not even trying to be portable. It's trying to be efficient. It's | |
29 | * just a cache, after all. | |
30 | */ | |
31 | ||
32 | #define CACHE_SIGNATURE 0x44495243 /* "DIRC" */ | |
33 | struct cache_header { | |
ccc4feb5 LT |
34 | unsigned int hdr_signature; |
35 | unsigned int hdr_version; | |
36 | unsigned int hdr_entries; | |
e83c5163 LT |
37 | }; |
38 | ||
39 | /* | |
40 | * The "cache_time" is just the low 32 bits of the | |
41 | * time. It doesn't matter if it overflows - we only | |
42 | * check it for equality in the 32 bits we save. | |
43 | */ | |
44 | struct cache_time { | |
45 | unsigned int sec; | |
46 | unsigned int nsec; | |
47 | }; | |
48 | ||
49 | /* | |
50 | * dev/ino/uid/gid/size are also just tracked to the low 32 bits | |
51 | * Again - this is just a (very strong in practice) heuristic that | |
52 | * the inode hasn't changed. | |
ccc4feb5 LT |
53 | * |
54 | * We save the fields in big-endian order to allow using the | |
55 | * index file over NFS transparently. | |
e83c5163 LT |
56 | */ |
57 | struct cache_entry { | |
ccc4feb5 LT |
58 | struct cache_time ce_ctime; |
59 | struct cache_time ce_mtime; | |
60 | unsigned int ce_dev; | |
61 | unsigned int ce_ino; | |
62 | unsigned int ce_mode; | |
63 | unsigned int ce_uid; | |
64 | unsigned int ce_gid; | |
65 | unsigned int ce_size; | |
e83c5163 | 66 | unsigned char sha1[20]; |
f5cabd13 | 67 | unsigned short ce_flags; |
59c1e249 | 68 | char name[0]; |
e83c5163 LT |
69 | }; |
70 | ||
95fd5bf8 LT |
71 | #define CE_NAMEMASK (0x0fff) |
72 | #define CE_STAGEMASK (0x3000) | |
aee46198 | 73 | #define CE_STAGESHIFT 12 |
95fd5bf8 | 74 | |
aee46198 JH |
75 | #define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT)) |
76 | #define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags)) | |
77 | #define ce_size(ce) cache_entry_size(ce_namelen(ce)) | |
78 | #define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT) | |
79 | ||
e4479470 LT |
80 | #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644) |
81 | #define create_ce_mode(mode) htonl(S_IFREG | ce_permissions(mode)) | |
82 | ||
aee46198 | 83 | #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7) |
f5cabd13 | 84 | |
e83c5163 LT |
85 | const char *sha1_file_directory; |
86 | struct cache_entry **active_cache; | |
87 | unsigned int active_nr, active_alloc; | |
88 | ||
89 | #define DB_ENVIRONMENT "SHA1_FILE_DIRECTORY" | |
4bb04f21 | 90 | #define DEFAULT_DB_ENVIRONMENT ".git/objects" |
e83c5163 | 91 | |
bb233d69 LT |
92 | #define get_object_directory() (getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT) |
93 | ||
94 | #define INDEX_ENVIRONMENT "GIT_INDEX_FILE" | |
95 | #define DEFAULT_INDEX_ENVIRONMENT ".git/index" | |
96 | ||
97 | #define get_index_file() (getenv(INDEX_ENVIRONMENT) ? : DEFAULT_INDEX_ENVIRONMENT) | |
98 | ||
e83c5163 LT |
99 | #define alloc_nr(x) (((x)+16)*3/2) |
100 | ||
734aab75 | 101 | /* Initialize and use the cache information */ |
e83c5163 | 102 | extern int read_cache(void); |
197ee8c9 | 103 | extern int write_cache(int newfd, struct cache_entry **cache, int entries); |
eb38c22f | 104 | extern int cache_name_pos(const char *name, int namelen); |
121481ab | 105 | extern int add_cache_entry(struct cache_entry *ce, int ok_to_add); |
b5af9107 | 106 | extern int remove_entry_at(int pos); |
197ee8c9 | 107 | extern int remove_file_from_cache(char *path); |
b5af9107 | 108 | extern int same_name(struct cache_entry *a, struct cache_entry *b); |
734aab75 LT |
109 | extern int cache_match_stat(struct cache_entry *ce, struct stat *st); |
110 | ||
111 | #define MTIME_CHANGED 0x0001 | |
112 | #define CTIME_CHANGED 0x0002 | |
113 | #define OWNER_CHANGED 0x0004 | |
114 | #define MODE_CHANGED 0x0008 | |
115 | #define INODE_CHANGED 0x0010 | |
116 | #define DATA_CHANGED 0x0020 | |
e83c5163 LT |
117 | |
118 | /* Return a statically allocated filename matching the sha1 signature */ | |
73134b6d | 119 | extern char *sha1_file_name(const unsigned char *sha1); |
e83c5163 LT |
120 | |
121 | /* Write a memory buffer out to the sha file */ | |
73134b6d | 122 | extern int write_sha1_buffer(const unsigned char *sha1, void *buf, unsigned int size); |
e83c5163 LT |
123 | |
124 | /* Read and unpack a sha1 file into memory, write memory to a sha1 file */ | |
73134b6d | 125 | extern void * map_sha1_file(const unsigned char *sha1, unsigned long *size); |
2ade9340 | 126 | extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size); |
73134b6d | 127 | extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size); |
f5b913c9 | 128 | extern int write_sha1_file(char *buf, unsigned long len, const char *type, unsigned char *return_sha1); |
8237b185 | 129 | |
d98b46f8 | 130 | extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size, const char *type); |
e83c5163 | 131 | |
94537c78 LT |
132 | /* Read a tree into the cache */ |
133 | extern int read_tree(void *buffer, unsigned long size, int stage); | |
134 | ||
8237b185 DB |
135 | extern int write_sha1_from_fd(const unsigned char *sha1, int fd); |
136 | ||
137 | extern int has_sha1_file(const unsigned char *sha1); | |
138 | ||
e83c5163 | 139 | /* Convert to/from hex/sha1 representation */ |
197ee8c9 LT |
140 | extern int get_sha1_hex(const char *hex, unsigned char *sha1); |
141 | extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */ | |
e83c5163 LT |
142 | |
143 | /* General helper functions */ | |
2de381f9 PB |
144 | extern void usage(const char *err); |
145 | extern void die(const char *err, ...); | |
146 | extern int error(const char *err, ...); | |
147 | ||
79517a06 | 148 | extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2); |
e83c5163 | 149 | |
40469ee9 JH |
150 | extern void *read_object_with_reference(const unsigned char *sha1, |
151 | const unsigned char *required_type, | |
152 | unsigned long *size, | |
153 | unsigned char *sha1_ret); | |
f4913f91 | 154 | |
ecee9d9e ET |
155 | void parse_date(char *date, char *buf, int bufsize); |
156 | void datestamp(char *buf, int bufsize); | |
157 | ||
812666c8 CL |
158 | static inline void *xmalloc(int size) |
159 | { | |
160 | void *ret = malloc(size); | |
161 | if (!ret) | |
162 | die("Out of memory, malloc failed"); | |
163 | return ret; | |
164 | } | |
165 | ||
166 | static inline void *xrealloc(void *ptr, int size) | |
167 | { | |
168 | void *ret = realloc(ptr, size); | |
169 | if (!ret) | |
170 | die("Out of memory, realloc failed"); | |
171 | return ret; | |
172 | } | |
173 | ||
e83c5163 | 174 | #endif /* CACHE_H */ |