[PATCH] Make nsec checking optional
[git/git.git] / cache.h
CommitLineData
e83c5163
LT
1#ifndef CACHE_H
2#define CACHE_H
3
4#include <stdio.h>
5#include <sys/stat.h>
6#include <fcntl.h>
7#include <stddef.h>
8#include <stdlib.h>
9#include <stdarg.h>
bf0c6e83 10#include <string.h>
e83c5163
LT
11#include <errno.h>
12#include <sys/mman.h>
13
14#include <openssl/sha.h>
15#include <zlib.h>
16
17/*
18 * Basic data structures for the directory cache
19 *
20 * NOTE NOTE NOTE! This is all in the native CPU byte format. It's
21 * not even trying to be portable. It's trying to be efficient. It's
22 * just a cache, after all.
23 */
24
25#define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
26struct cache_header {
27 unsigned int signature;
28 unsigned int version;
29 unsigned int entries;
30 unsigned char sha1[20];
31};
32
33/*
34 * The "cache_time" is just the low 32 bits of the
35 * time. It doesn't matter if it overflows - we only
36 * check it for equality in the 32 bits we save.
37 */
38struct cache_time {
39 unsigned int sec;
40 unsigned int nsec;
41};
42
43/*
44 * dev/ino/uid/gid/size are also just tracked to the low 32 bits
45 * Again - this is just a (very strong in practice) heuristic that
46 * the inode hasn't changed.
47 */
48struct cache_entry {
49 struct cache_time ctime;
50 struct cache_time mtime;
51 unsigned int st_dev;
52 unsigned int st_ino;
53 unsigned int st_mode;
54 unsigned int st_uid;
55 unsigned int st_gid;
56 unsigned int st_size;
57 unsigned char sha1[20];
58 unsigned short namelen;
59c1e249 59 char name[0];
e83c5163
LT
60};
61
62const char *sha1_file_directory;
63struct cache_entry **active_cache;
64unsigned int active_nr, active_alloc;
65
66#define DB_ENVIRONMENT "SHA1_FILE_DIRECTORY"
4bb04f21 67#define DEFAULT_DB_ENVIRONMENT ".git/objects"
e83c5163
LT
68
69#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
70#define ce_size(ce) cache_entry_size((ce)->namelen)
71
72#define alloc_nr(x) (((x)+16)*3/2)
73
734aab75 74/* Initialize and use the cache information */
e83c5163 75extern int read_cache(void);
197ee8c9 76extern int write_cache(int newfd, struct cache_entry **cache, int entries);
eb38c22f 77extern int cache_name_pos(const char *name, int namelen);
121481ab 78extern int add_cache_entry(struct cache_entry *ce, int ok_to_add);
197ee8c9 79extern int remove_file_from_cache(char *path);
734aab75
LT
80extern int cache_match_stat(struct cache_entry *ce, struct stat *st);
81
82#define MTIME_CHANGED 0x0001
83#define CTIME_CHANGED 0x0002
84#define OWNER_CHANGED 0x0004
85#define MODE_CHANGED 0x0008
86#define INODE_CHANGED 0x0010
87#define DATA_CHANGED 0x0020
e83c5163
LT
88
89/* Return a statically allocated filename matching the sha1 signature */
73134b6d 90extern char *sha1_file_name(const unsigned char *sha1);
e83c5163
LT
91
92/* Write a memory buffer out to the sha file */
73134b6d 93extern int write_sha1_buffer(const unsigned char *sha1, void *buf, unsigned int size);
e83c5163
LT
94
95/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
73134b6d 96extern void * map_sha1_file(const unsigned char *sha1, unsigned long *size);
2ade9340 97extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size);
73134b6d 98extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
d6d3f9d0 99extern int write_sha1_file(char *buf, unsigned len, unsigned char *return_sha1);
24778e33 100extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size);
e83c5163
LT
101
102/* Convert to/from hex/sha1 representation */
197ee8c9
LT
103extern int get_sha1_hex(const char *hex, unsigned char *sha1);
104extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
e83c5163
LT
105
106/* General helper functions */
121481ab 107extern void usage(const char *err, ...);
79517a06 108extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
e83c5163
LT
109
110#endif /* CACHE_H */