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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 | |
30 | #define DTYPE(de) DT_UNKNOWN | |
31 | #endif | |
32 | ||
e83c5163 LT |
33 | /* |
34 | * Basic data structures for the directory cache | |
35 | * | |
36 | * NOTE NOTE NOTE! This is all in the native CPU byte format. It's | |
37 | * not even trying to be portable. It's trying to be efficient. It's | |
38 | * just a cache, after all. | |
39 | */ | |
40 | ||
41 | #define CACHE_SIGNATURE 0x44495243 /* "DIRC" */ | |
42 | struct cache_header { | |
ccc4feb5 LT |
43 | unsigned int hdr_signature; |
44 | unsigned int hdr_version; | |
45 | unsigned int hdr_entries; | |
e83c5163 LT |
46 | }; |
47 | ||
48 | /* | |
49 | * The "cache_time" is just the low 32 bits of the | |
50 | * time. It doesn't matter if it overflows - we only | |
51 | * check it for equality in the 32 bits we save. | |
52 | */ | |
53 | struct cache_time { | |
54 | unsigned int sec; | |
55 | unsigned int nsec; | |
56 | }; | |
57 | ||
58 | /* | |
59 | * dev/ino/uid/gid/size are also just tracked to the low 32 bits | |
60 | * Again - this is just a (very strong in practice) heuristic that | |
61 | * the inode hasn't changed. | |
ccc4feb5 LT |
62 | * |
63 | * We save the fields in big-endian order to allow using the | |
64 | * index file over NFS transparently. | |
e83c5163 LT |
65 | */ |
66 | struct cache_entry { | |
ccc4feb5 LT |
67 | struct cache_time ce_ctime; |
68 | struct cache_time ce_mtime; | |
69 | unsigned int ce_dev; | |
70 | unsigned int ce_ino; | |
71 | unsigned int ce_mode; | |
72 | unsigned int ce_uid; | |
73 | unsigned int ce_gid; | |
74 | unsigned int ce_size; | |
e83c5163 | 75 | unsigned char sha1[20]; |
f5cabd13 | 76 | unsigned short ce_flags; |
59c1e249 | 77 | char name[0]; |
e83c5163 LT |
78 | }; |
79 | ||
95fd5bf8 LT |
80 | #define CE_NAMEMASK (0x0fff) |
81 | #define CE_STAGEMASK (0x3000) | |
aee46198 | 82 | #define CE_STAGESHIFT 12 |
95fd5bf8 | 83 | |
aee46198 JH |
84 | #define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT)) |
85 | #define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags)) | |
86 | #define ce_size(ce) cache_entry_size(ce_namelen(ce)) | |
87 | #define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT) | |
88 | ||
e4479470 | 89 | #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644) |
8ae0a8c5 KS |
90 | static inline unsigned int create_ce_mode(unsigned int mode) |
91 | { | |
8ae0a8c5 KS |
92 | if (S_ISLNK(mode)) |
93 | return htonl(S_IFLNK); | |
db823d4a | 94 | return htonl(S_IFREG | ce_permissions(mode)); |
8ae0a8c5 | 95 | } |
e4479470 | 96 | |
aee46198 | 97 | #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7) |
f5cabd13 | 98 | |
e83c5163 | 99 | struct cache_entry **active_cache; |
ee267527 | 100 | unsigned int active_nr, active_alloc, active_cache_changed; |
e83c5163 LT |
101 | |
102 | #define DB_ENVIRONMENT "SHA1_FILE_DIRECTORY" | |
4bb04f21 | 103 | #define DEFAULT_DB_ENVIRONMENT ".git/objects" |
ace1534d | 104 | #define ALTERNATE_DB_ENVIRONMENT "SHA1_FILE_DIRECTORIES" |
e83c5163 | 105 | |
bb233d69 LT |
106 | #define get_object_directory() (getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT) |
107 | ||
108 | #define INDEX_ENVIRONMENT "GIT_INDEX_FILE" | |
109 | #define DEFAULT_INDEX_ENVIRONMENT ".git/index" | |
110 | ||
111 | #define get_index_file() (getenv(INDEX_ENVIRONMENT) ? : DEFAULT_INDEX_ENVIRONMENT) | |
112 | ||
e83c5163 LT |
113 | #define alloc_nr(x) (((x)+16)*3/2) |
114 | ||
734aab75 | 115 | /* Initialize and use the cache information */ |
e83c5163 | 116 | extern int read_cache(void); |
197ee8c9 | 117 | extern int write_cache(int newfd, struct cache_entry **cache, int entries); |
eb38c22f | 118 | extern int cache_name_pos(const char *name, int namelen); |
192268c1 JH |
119 | #define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */ |
120 | #define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */ | |
121 | extern int add_cache_entry(struct cache_entry *ce, int option); | |
b5af9107 | 122 | extern int remove_entry_at(int pos); |
197ee8c9 | 123 | extern int remove_file_from_cache(char *path); |
b5af9107 | 124 | extern int same_name(struct cache_entry *a, struct cache_entry *b); |
734aab75 | 125 | extern int cache_match_stat(struct cache_entry *ce, struct stat *st); |
74400e71 | 126 | extern int index_fd(unsigned char *sha1, int fd, struct stat *st); |
734aab75 LT |
127 | |
128 | #define MTIME_CHANGED 0x0001 | |
129 | #define CTIME_CHANGED 0x0002 | |
130 | #define OWNER_CHANGED 0x0004 | |
131 | #define MODE_CHANGED 0x0008 | |
132 | #define INODE_CHANGED 0x0010 | |
133 | #define DATA_CHANGED 0x0020 | |
8ae0a8c5 | 134 | #define TYPE_CHANGED 0x0040 |
e83c5163 LT |
135 | |
136 | /* Return a statically allocated filename matching the sha1 signature */ | |
73134b6d | 137 | extern char *sha1_file_name(const unsigned char *sha1); |
e83c5163 | 138 | |
e83c5163 | 139 | /* Read and unpack a sha1 file into memory, write memory to a sha1 file */ |
73134b6d | 140 | extern void * map_sha1_file(const unsigned char *sha1, unsigned long *size); |
2ade9340 | 141 | extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size); |
73134b6d | 142 | extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size); |
f5b913c9 | 143 | extern int write_sha1_file(char *buf, unsigned long len, const char *type, unsigned char *return_sha1); |
8237b185 | 144 | |
d98b46f8 | 145 | extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size, const char *type); |
e83c5163 | 146 | |
94537c78 LT |
147 | /* Read a tree into the cache */ |
148 | extern int read_tree(void *buffer, unsigned long size, int stage); | |
149 | ||
8237b185 DB |
150 | extern int write_sha1_from_fd(const unsigned char *sha1, int fd); |
151 | ||
152 | extern int has_sha1_file(const unsigned char *sha1); | |
153 | ||
e83c5163 | 154 | /* Convert to/from hex/sha1 representation */ |
3c249c95 | 155 | extern int get_sha1(const char *str, unsigned char *sha1); |
197ee8c9 LT |
156 | extern int get_sha1_hex(const char *hex, unsigned char *sha1); |
157 | extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */ | |
e83c5163 LT |
158 | |
159 | /* General helper functions */ | |
2de381f9 PB |
160 | extern void usage(const char *err); |
161 | extern void die(const char *err, ...); | |
162 | extern int error(const char *err, ...); | |
163 | ||
79517a06 | 164 | extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2); |
e83c5163 | 165 | |
40469ee9 JH |
166 | extern void *read_object_with_reference(const unsigned char *sha1, |
167 | const unsigned char *required_type, | |
168 | unsigned long *size, | |
169 | unsigned char *sha1_ret); | |
f4913f91 | 170 | |
f80cd783 | 171 | const char *show_date(unsigned long time, int timezone); |
ecee9d9e ET |
172 | void parse_date(char *date, char *buf, int bufsize); |
173 | void datestamp(char *buf, int bufsize); | |
174 | ||
812666c8 CL |
175 | static inline void *xmalloc(int size) |
176 | { | |
177 | void *ret = malloc(size); | |
178 | if (!ret) | |
179 | die("Out of memory, malloc failed"); | |
180 | return ret; | |
181 | } | |
182 | ||
183 | static inline void *xrealloc(void *ptr, int size) | |
184 | { | |
185 | void *ret = realloc(ptr, size); | |
186 | if (!ret) | |
187 | die("Out of memory, realloc failed"); | |
188 | return ret; | |
189 | } | |
190 | ||
e83c5163 | 191 | #endif /* CACHE_H */ |