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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 | ||
b6829693 ET |
24 | #ifdef DT_UNKNOWN |
25 | #define DTYPE(de) ((de)->d_type) | |
26 | #else | |
27 | #define DT_UNKNOWN 0 | |
28 | #define DT_DIR 1 | |
29 | #define DT_REG 2 | |
a15c1c60 | 30 | #define DT_LNK 3 |
b6829693 ET |
31 | #define DTYPE(de) DT_UNKNOWN |
32 | #endif | |
33 | ||
d19938ab JH |
34 | /* |
35 | * Environment variables transition. | |
36 | * We accept older names for now but warn. | |
37 | */ | |
38 | extern char *gitenv_bc(const char *); | |
39 | #define gitenv(e) (getenv(e) ? : gitenv_bc(e)) | |
40 | ||
e83c5163 LT |
41 | /* |
42 | * Basic data structures for the directory cache | |
e83c5163 LT |
43 | */ |
44 | ||
45 | #define CACHE_SIGNATURE 0x44495243 /* "DIRC" */ | |
46 | struct cache_header { | |
ccc4feb5 LT |
47 | unsigned int hdr_signature; |
48 | unsigned int hdr_version; | |
49 | unsigned int hdr_entries; | |
e83c5163 LT |
50 | }; |
51 | ||
52 | /* | |
53 | * The "cache_time" is just the low 32 bits of the | |
54 | * time. It doesn't matter if it overflows - we only | |
55 | * check it for equality in the 32 bits we save. | |
56 | */ | |
57 | struct cache_time { | |
58 | unsigned int sec; | |
59 | unsigned int nsec; | |
60 | }; | |
61 | ||
62 | /* | |
63 | * dev/ino/uid/gid/size are also just tracked to the low 32 bits | |
64 | * Again - this is just a (very strong in practice) heuristic that | |
65 | * the inode hasn't changed. | |
ccc4feb5 LT |
66 | * |
67 | * We save the fields in big-endian order to allow using the | |
68 | * index file over NFS transparently. | |
e83c5163 LT |
69 | */ |
70 | struct cache_entry { | |
ccc4feb5 LT |
71 | struct cache_time ce_ctime; |
72 | struct cache_time ce_mtime; | |
73 | unsigned int ce_dev; | |
74 | unsigned int ce_ino; | |
75 | unsigned int ce_mode; | |
76 | unsigned int ce_uid; | |
77 | unsigned int ce_gid; | |
78 | unsigned int ce_size; | |
e83c5163 | 79 | unsigned char sha1[20]; |
f5cabd13 | 80 | unsigned short ce_flags; |
59c1e249 | 81 | char name[0]; |
e83c5163 LT |
82 | }; |
83 | ||
95fd5bf8 LT |
84 | #define CE_NAMEMASK (0x0fff) |
85 | #define CE_STAGEMASK (0x3000) | |
aee46198 | 86 | #define CE_STAGESHIFT 12 |
95fd5bf8 | 87 | |
aee46198 JH |
88 | #define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT)) |
89 | #define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags)) | |
90 | #define ce_size(ce) cache_entry_size(ce_namelen(ce)) | |
91 | #define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT) | |
92 | ||
e4479470 | 93 | #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644) |
8ae0a8c5 KS |
94 | static inline unsigned int create_ce_mode(unsigned int mode) |
95 | { | |
8ae0a8c5 KS |
96 | if (S_ISLNK(mode)) |
97 | return htonl(S_IFLNK); | |
db823d4a | 98 | return htonl(S_IFREG | ce_permissions(mode)); |
8ae0a8c5 | 99 | } |
e4479470 | 100 | |
aee46198 | 101 | #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7) |
f5cabd13 | 102 | |
88355048 PB |
103 | extern struct cache_entry **active_cache; |
104 | extern unsigned int active_nr, active_alloc, active_cache_changed; | |
e83c5163 | 105 | |
8ac069ac JH |
106 | #define GIT_DIR_ENVIRONMENT "GIT_DIR" |
107 | #define DEFAULT_GIT_DIR_ENVIRONMENT ".git" | |
d19938ab | 108 | #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY" |
bb233d69 | 109 | #define INDEX_ENVIRONMENT "GIT_INDEX_FILE" |
bb233d69 | 110 | |
8ac069ac JH |
111 | extern char *get_object_directory(void); |
112 | extern char *get_index_file(void); | |
113 | ||
114 | #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES" | |
bb233d69 | 115 | |
e83c5163 LT |
116 | #define alloc_nr(x) (((x)+16)*3/2) |
117 | ||
734aab75 | 118 | /* Initialize and use the cache information */ |
e83c5163 | 119 | extern int read_cache(void); |
197ee8c9 | 120 | extern int write_cache(int newfd, struct cache_entry **cache, int entries); |
eb38c22f | 121 | extern int cache_name_pos(const char *name, int namelen); |
192268c1 JH |
122 | #define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */ |
123 | #define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */ | |
124 | extern int add_cache_entry(struct cache_entry *ce, int option); | |
dbbce55b | 125 | extern int remove_cache_entry_at(int pos); |
197ee8c9 | 126 | extern int remove_file_from_cache(char *path); |
dbbce55b | 127 | extern int ce_same_name(struct cache_entry *a, struct cache_entry *b); |
5d728c84 | 128 | extern int ce_match_stat(struct cache_entry *ce, struct stat *st); |
74400e71 | 129 | extern int index_fd(unsigned char *sha1, int fd, struct stat *st); |
734aab75 LT |
130 | |
131 | #define MTIME_CHANGED 0x0001 | |
132 | #define CTIME_CHANGED 0x0002 | |
133 | #define OWNER_CHANGED 0x0004 | |
134 | #define MODE_CHANGED 0x0008 | |
135 | #define INODE_CHANGED 0x0010 | |
136 | #define DATA_CHANGED 0x0020 | |
8ae0a8c5 | 137 | #define TYPE_CHANGED 0x0040 |
e83c5163 LT |
138 | |
139 | /* Return a statically allocated filename matching the sha1 signature */ | |
73134b6d | 140 | extern char *sha1_file_name(const unsigned char *sha1); |
e83c5163 | 141 | |
e83c5163 | 142 | /* Read and unpack a sha1 file into memory, write memory to a sha1 file */ |
73134b6d | 143 | extern void * map_sha1_file(const unsigned char *sha1, unsigned long *size); |
2ade9340 | 144 | extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size); |
73134b6d | 145 | extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size); |
f5b913c9 | 146 | extern int write_sha1_file(char *buf, unsigned long len, const char *type, unsigned char *return_sha1); |
8237b185 | 147 | |
d98b46f8 | 148 | extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size, const char *type); |
e83c5163 | 149 | |
94537c78 LT |
150 | /* Read a tree into the cache */ |
151 | extern int read_tree(void *buffer, unsigned long size, int stage); | |
152 | ||
8237b185 DB |
153 | extern int write_sha1_from_fd(const unsigned char *sha1, int fd); |
154 | ||
155 | extern int has_sha1_file(const unsigned char *sha1); | |
156 | ||
e83c5163 | 157 | /* Convert to/from hex/sha1 representation */ |
3c249c95 | 158 | extern int get_sha1(const char *str, unsigned char *sha1); |
197ee8c9 LT |
159 | extern int get_sha1_hex(const char *hex, unsigned char *sha1); |
160 | extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */ | |
e83c5163 LT |
161 | |
162 | /* General helper functions */ | |
2de381f9 PB |
163 | extern void usage(const char *err); |
164 | extern void die(const char *err, ...); | |
165 | extern int error(const char *err, ...); | |
166 | ||
79517a06 | 167 | extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2); |
e83c5163 | 168 | |
40469ee9 JH |
169 | extern void *read_object_with_reference(const unsigned char *sha1, |
170 | const unsigned char *required_type, | |
171 | unsigned long *size, | |
172 | unsigned char *sha1_ret); | |
f4913f91 | 173 | |
f80cd783 | 174 | const char *show_date(unsigned long time, int timezone); |
ecee9d9e ET |
175 | void parse_date(char *date, char *buf, int bufsize); |
176 | void datestamp(char *buf, int bufsize); | |
177 | ||
127cfd0d | 178 | static inline void *xmalloc(size_t size) |
812666c8 CL |
179 | { |
180 | void *ret = malloc(size); | |
181 | if (!ret) | |
182 | die("Out of memory, malloc failed"); | |
183 | return ret; | |
184 | } | |
185 | ||
127cfd0d | 186 | static inline void *xrealloc(void *ptr, size_t size) |
812666c8 CL |
187 | { |
188 | void *ret = realloc(ptr, size); | |
189 | if (!ret) | |
190 | die("Out of memory, realloc failed"); | |
191 | return ret; | |
192 | } | |
193 | ||
127cfd0d BR |
194 | static inline void *xcalloc(size_t nmemb, size_t size) |
195 | { | |
196 | void *ret = calloc(nmemb, size); | |
197 | if (!ret) | |
198 | die("Out of memory, calloc failed"); | |
199 | return ret; | |
200 | } | |
201 | ||
e83c5163 | 202 | #endif /* CACHE_H */ |