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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 LT |
89 | #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644) |
90 | #define create_ce_mode(mode) htonl(S_IFREG | ce_permissions(mode)) | |
91 | ||
aee46198 | 92 | #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7) |
f5cabd13 | 93 | |
e83c5163 LT |
94 | const char *sha1_file_directory; |
95 | struct cache_entry **active_cache; | |
96 | unsigned int active_nr, active_alloc; | |
97 | ||
98 | #define DB_ENVIRONMENT "SHA1_FILE_DIRECTORY" | |
4bb04f21 | 99 | #define DEFAULT_DB_ENVIRONMENT ".git/objects" |
e83c5163 | 100 | |
bb233d69 LT |
101 | #define get_object_directory() (getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT) |
102 | ||
103 | #define INDEX_ENVIRONMENT "GIT_INDEX_FILE" | |
104 | #define DEFAULT_INDEX_ENVIRONMENT ".git/index" | |
105 | ||
106 | #define get_index_file() (getenv(INDEX_ENVIRONMENT) ? : DEFAULT_INDEX_ENVIRONMENT) | |
107 | ||
e83c5163 LT |
108 | #define alloc_nr(x) (((x)+16)*3/2) |
109 | ||
734aab75 | 110 | /* Initialize and use the cache information */ |
e83c5163 | 111 | extern int read_cache(void); |
197ee8c9 | 112 | extern int write_cache(int newfd, struct cache_entry **cache, int entries); |
eb38c22f | 113 | extern int cache_name_pos(const char *name, int namelen); |
121481ab | 114 | extern int add_cache_entry(struct cache_entry *ce, int ok_to_add); |
b5af9107 | 115 | extern int remove_entry_at(int pos); |
197ee8c9 | 116 | extern int remove_file_from_cache(char *path); |
b5af9107 | 117 | extern int same_name(struct cache_entry *a, struct cache_entry *b); |
734aab75 | 118 | extern int cache_match_stat(struct cache_entry *ce, struct stat *st); |
74400e71 | 119 | extern int index_fd(unsigned char *sha1, int fd, struct stat *st); |
734aab75 LT |
120 | |
121 | #define MTIME_CHANGED 0x0001 | |
122 | #define CTIME_CHANGED 0x0002 | |
123 | #define OWNER_CHANGED 0x0004 | |
124 | #define MODE_CHANGED 0x0008 | |
125 | #define INODE_CHANGED 0x0010 | |
126 | #define DATA_CHANGED 0x0020 | |
e83c5163 LT |
127 | |
128 | /* Return a statically allocated filename matching the sha1 signature */ | |
73134b6d | 129 | extern char *sha1_file_name(const unsigned char *sha1); |
e83c5163 | 130 | |
e83c5163 | 131 | /* Read and unpack a sha1 file into memory, write memory to a sha1 file */ |
73134b6d | 132 | extern void * map_sha1_file(const unsigned char *sha1, unsigned long *size); |
2ade9340 | 133 | extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size); |
73134b6d | 134 | extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size); |
f5b913c9 | 135 | extern int write_sha1_file(char *buf, unsigned long len, const char *type, unsigned char *return_sha1); |
8237b185 | 136 | |
d98b46f8 | 137 | extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size, const char *type); |
e83c5163 | 138 | |
94537c78 LT |
139 | /* Read a tree into the cache */ |
140 | extern int read_tree(void *buffer, unsigned long size, int stage); | |
141 | ||
8237b185 DB |
142 | extern int write_sha1_from_fd(const unsigned char *sha1, int fd); |
143 | ||
144 | extern int has_sha1_file(const unsigned char *sha1); | |
145 | ||
e83c5163 | 146 | /* Convert to/from hex/sha1 representation */ |
3c249c95 | 147 | extern int get_sha1(const char *str, unsigned char *sha1); |
197ee8c9 LT |
148 | extern int get_sha1_hex(const char *hex, unsigned char *sha1); |
149 | extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */ | |
e83c5163 LT |
150 | |
151 | /* General helper functions */ | |
2de381f9 PB |
152 | extern void usage(const char *err); |
153 | extern void die(const char *err, ...); | |
154 | extern int error(const char *err, ...); | |
155 | ||
79517a06 | 156 | extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2); |
e83c5163 | 157 | |
40469ee9 JH |
158 | extern void *read_object_with_reference(const unsigned char *sha1, |
159 | const unsigned char *required_type, | |
160 | unsigned long *size, | |
161 | unsigned char *sha1_ret); | |
f4913f91 | 162 | |
ecee9d9e ET |
163 | void parse_date(char *date, char *buf, int bufsize); |
164 | void datestamp(char *buf, int bufsize); | |
165 | ||
812666c8 CL |
166 | static inline void *xmalloc(int size) |
167 | { | |
168 | void *ret = malloc(size); | |
169 | if (!ret) | |
170 | die("Out of memory, malloc failed"); | |
171 | return ret; | |
172 | } | |
173 | ||
174 | static inline void *xrealloc(void *ptr, int size) | |
175 | { | |
176 | void *ret = realloc(ptr, size); | |
177 | if (!ret) | |
178 | die("Out of memory, realloc failed"); | |
179 | return ret; | |
180 | } | |
181 | ||
e83c5163 | 182 | #endif /* CACHE_H */ |