[thirdparty/git.git] / cache.h

#ifndef CACHE_H
#define CACHE_H

#include <unistd.h>
#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <dirent.h>

#include SHA1_HEADER
#include <zlib.h>

#if ZLIB_VERNUM < 0x1200
#define deflateBound(c,s)  ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
#endif

#ifdef DT_UNKNOWN
#define DTYPE(de)	((de)->d_type)
#else
#define DT_UNKNOWN	0
#define DT_DIR		1
#define DT_REG		2
#define DT_LNK		3
#define DTYPE(de)	DT_UNKNOWN
#endif

#ifdef __GNUC__
#define NORETURN __attribute__((__noreturn__))
#else
#define NORETURN
#ifndef __attribute__
#define __attribute__(x)
#endif
#endif

/*
 * Intensive research over the course of many years has shown that
 * port 9418 is totally unused by anything else. Or
 *
 *	Your search - "port 9418" - did not match any documents.
 *
 * as www.google.com puts it.
 *
 * This port has been properly assigned for git use by IANA:
 * git (Assigned-9418) [I06-050728-0001].
 *
 *	git  9418/tcp   git pack transfer service
 *	git  9418/udp   git pack transfer service
 *
 * with Linus Torvalds <torvalds@osdl.org> as the point of
 * contact. September 2005.
 *
 * See http://www.iana.org/assignments/port-numbers
 */
#define DEFAULT_GIT_PORT 9418

/*
 * Basic data structures for the directory cache
 */

#define CACHE_SIGNATURE 0x44495243	/* "DIRC" */
struct cache_header {
	unsigned int hdr_signature;
	unsigned int hdr_version;
	unsigned int hdr_entries;
};

/*
 * The "cache_time" is just the low 32 bits of the
 * time. It doesn't matter if it overflows - we only
 * check it for equality in the 32 bits we save.
 */
struct cache_time {
	unsigned int sec;
	unsigned int nsec;
};

/*
 * dev/ino/uid/gid/size are also just tracked to the low 32 bits
 * Again - this is just a (very strong in practice) heuristic that
 * the inode hasn't changed.
 *
 * We save the fields in big-endian order to allow using the
 * index file over NFS transparently.
 */
struct cache_entry {
	struct cache_time ce_ctime;
	struct cache_time ce_mtime;
	unsigned int ce_dev;
	unsigned int ce_ino;
	unsigned int ce_mode;
	unsigned int ce_uid;
	unsigned int ce_gid;
	unsigned int ce_size;
	unsigned char sha1[20];
	unsigned short ce_flags;
	char name[0];
};

#define CE_NAMEMASK  (0x0fff)
#define CE_STAGEMASK (0x3000)
#define CE_UPDATE    (0x4000)
#define CE_STAGESHIFT 12

#define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT))
#define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags))
#define ce_size(ce) cache_entry_size(ce_namelen(ce))
#define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT)

#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
static inline unsigned int create_ce_mode(unsigned int mode)
{
	if (S_ISLNK(mode))
		return htonl(S_IFLNK);
	return htonl(S_IFREG | ce_permissions(mode));
}

#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)

extern struct cache_entry **active_cache;
extern unsigned int active_nr, active_alloc, active_cache_changed;

#define GIT_DIR_ENVIRONMENT "GIT_DIR"
#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"

extern char *get_git_dir(void);
extern char *get_object_directory(void);
extern char *get_refs_directory(void);
extern char *get_index_file(void);
extern char *get_graft_file(void);

#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"

extern const char **get_pathspec(const char *prefix, const char **pathspec);
extern const char *setup_git_directory(void);
extern const char *prefix_path(const char *prefix, int len, const char *path);

#define alloc_nr(x) (((x)+16)*3/2)

/* Initialize and use the cache information */
extern int read_cache(void);
extern int write_cache(int newfd, struct cache_entry **cache, int entries);
extern int cache_name_pos(const char *name, int namelen);
#define ADD_CACHE_OK_TO_ADD 1		/* Ok to add */
#define ADD_CACHE_OK_TO_REPLACE 2	/* Ok to replace file/directory */
#define ADD_CACHE_SKIP_DFCHECK 4	/* Ok to skip DF conflict checks */
extern int add_cache_entry(struct cache_entry *ce, int option);
extern int remove_cache_entry_at(int pos);
extern int remove_file_from_cache(const char *path);
extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
extern int ce_match_stat(struct cache_entry *ce, struct stat *st);
extern int ce_modified(struct cache_entry *ce, struct stat *st);
extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type);
extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);

struct cache_file {
	struct cache_file *next;
	char lockfile[PATH_MAX];
};
extern int hold_index_file_for_update(struct cache_file *, const char *path);
extern int commit_index_file(struct cache_file *);
extern void rollback_index_file(struct cache_file *);

#define MTIME_CHANGED	0x0001
#define CTIME_CHANGED	0x0002
#define OWNER_CHANGED	0x0004
#define MODE_CHANGED    0x0008
#define INODE_CHANGED   0x0010
#define DATA_CHANGED    0x0020
#define TYPE_CHANGED    0x0040

/* Return a statically allocated filename matching the sha1 signature */
extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
extern char *sha1_file_name(const unsigned char *sha1);
extern char *sha1_pack_name(const unsigned char *sha1);
extern char *sha1_pack_index_name(const unsigned char *sha1);
extern const unsigned char null_sha1[20];

int git_mkstemp(char *path, size_t n, const char *template);

int safe_create_leading_directories(char *path);
char *safe_strncpy(char *, const char *, size_t);

/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
extern int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size);
extern int parse_sha1_header(char *hdr, char *type, unsigned long *sizep);
extern int sha1_object_info(const unsigned char *, char *, unsigned long *);
extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size);
extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
extern char *write_sha1_file_prepare(void *buf,
				     unsigned long len,
				     const char *type,
				     unsigned char *sha1,
				     unsigned char *hdr,
				     int *hdrlen);

extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);

/* Read a tree into the cache */
extern int read_tree(void *buffer, unsigned long size, int stage, const char **paths);

extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
			      size_t bufsize, size_t *bufposn);
extern int write_sha1_to_fd(int fd, const unsigned char *sha1);

extern int has_sha1_pack(const unsigned char *sha1);
extern int has_sha1_file(const unsigned char *sha1);

extern int has_pack_file(const unsigned char *sha1);
extern int has_pack_index(const unsigned char *sha1);

/* Convert to/from hex/sha1 representation */
extern int get_sha1(const char *str, unsigned char *sha1);
extern int get_sha1_hex(const char *hex, unsigned char *sha1);
extern char *sha1_to_hex(const unsigned char *sha1);	/* static buffer result! */

/* General helper functions */
extern void usage(const char *err) NORETURN;
extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));

extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);

extern void *read_object_with_reference(const unsigned char *sha1,
					const char *required_type,
					unsigned long *size,
					unsigned char *sha1_ret);

const char *show_date(unsigned long time, int timezone);
int parse_date(const char *date, char *buf, int bufsize);
void datestamp(char *buf, int bufsize);

extern int setup_ident(void);
extern char *get_ident(const char *name, const char *email, const char *date_str);
extern char *git_author_info(void);
extern char *git_committer_info(void);

static inline void *xmalloc(size_t size)
{
	void *ret = malloc(size);
	if (!ret)
		die("Out of memory, malloc failed");
	return ret;
}

static inline void *xrealloc(void *ptr, size_t size)
{
	void *ret = realloc(ptr, size);
	if (!ret)
		die("Out of memory, realloc failed");
	return ret;
}

static inline void *xcalloc(size_t nmemb, size_t size)
{
	void *ret = calloc(nmemb, size);
	if (!ret)
		die("Out of memory, calloc failed");
	return ret;
}

struct checkout {
	const char *base_dir;
	int base_dir_len;
	unsigned force:1,
		 quiet:1,
		 not_new:1,
		 refresh_cache:1;
};

extern int checkout_entry(struct cache_entry *ce, struct checkout *state);

extern struct alternate_object_database {
	struct alternate_object_database *next;
	char *name;
	char base[0]; /* more */
} *alt_odb_list;
extern void prepare_alt_odb(void);

extern struct packed_git {
	struct packed_git *next;
	unsigned long index_size;
	unsigned long pack_size;
	unsigned int *index_base;
	void *pack_base;
	unsigned int pack_last_used;
	unsigned int pack_use_cnt;
	unsigned char sha1[20];
	char pack_name[0]; /* something like ".git/objects/pack/xxxxx.pack" */
} *packed_git;

struct pack_entry {
	unsigned int offset;
	unsigned char sha1[20];
	struct packed_git *p;
};

struct ref {
	struct ref *next;
	unsigned char old_sha1[20];
	unsigned char new_sha1[20];
	unsigned char force;
	struct ref *peer_ref; /* when renaming */
	char name[0];
};

extern int git_connect(int fd[2], char *url, const char *prog);
extern int finish_connect(pid_t pid);
extern int path_match(const char *path, int nr, char **match);
extern int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
		      int nr_refspec, char **refspec, int all);
extern int get_ack(int fd, unsigned char *result_sha1);
extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match);

extern struct packed_git *parse_pack_index(unsigned char *sha1);
extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
						char *idx_path);

extern void prepare_packed_git(void);
extern void install_packed_git(struct packed_git *pack);

extern struct packed_git *find_sha1_pack(const unsigned char *sha1, 
					 struct packed_git *packs);

extern int use_packed_git(struct packed_git *);
extern void unuse_packed_git(struct packed_git *);
extern struct packed_git *add_packed_git(char *, int);
extern int num_packed_objects(const struct packed_git *p);
extern int nth_packed_object_sha1(const struct packed_git *, int, unsigned char*);
extern int find_pack_entry_one(const unsigned char *, struct pack_entry *, struct packed_git *);
extern void *unpack_entry_gently(struct pack_entry *, char *, unsigned long *);
extern void packed_object_info_detail(struct pack_entry *, char *, unsigned long *, unsigned long *, int *, unsigned char *);

/* Dumb servers support */
extern int update_server_info(int);

#endif /* CACHE_H */
Commit	Line	Data
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	12	#include <errno.h>
6b0c3121	13	#include <limits.h>
e83c5163	14	#include <sys/mman.h>
bb233d69	15	#include <sys/param.h>
ccc4feb5	16	#include <netinet/in.h>
575f4974 LT	17	#include <sys/types.h>
575f4974 LT	18	#include <dirent.h>
e83c5163	19
cef661fc	20	#include SHA1_HEADER
e83c5163 LT	21	#include <zlib.h>
e83c5163 LT	22
9da3acfb ET	23	#if ZLIB_VERNUM < 0x1200
	24	#define deflateBound(c,s) ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
	25	#endif
	26
b6829693 ET	27	#ifdef DT_UNKNOWN
	28	#define DTYPE(de) ((de)->d_type)
	29	#else
	30	#define DT_UNKNOWN 0
	31	#define DT_DIR 1
	32	#define DT_REG 2
a15c1c60	33	#define DT_LNK 3
b6829693 ET	34	#define DTYPE(de) DT_UNKNOWN
	35	#endif
	36
90334cf7 LT	37	#ifdef __GNUC__
	38	#define NORETURN __attribute__((__noreturn__))
	39	#else
	40	#define NORETURN
4ec99bf0	41	#ifndef __attribute__
75ea6911	42	#define __attribute__(x)
4ec99bf0	43	#endif
f1d090e1	44	#endif
4ec99bf0	45
2386d658 LT	46	/*
	47	* Intensive research over the course of many years has shown that
	48	* port 9418 is totally unused by anything else. Or
	49	*
	50	* Your search - "port 9418" - did not match any documents.
	51	*
	52	* as www.google.com puts it.
ba8a4970 LT	53	*
	54	* This port has been properly assigned for git use by IANA:
	55	* git (Assigned-9418) [I06-050728-0001].
	56	*
	57	* git 9418/tcp git pack transfer service
	58	* git 9418/udp git pack transfer service
	59	*
	60	* with Linus Torvalds <torvalds@osdl.org> as the point of
	61	* contact. September 2005.
	62	*
	63	* See http://www.iana.org/assignments/port-numbers
2386d658 LT	64	*/
	65	#define DEFAULT_GIT_PORT 9418
	66
e83c5163 LT	67	/*
e83c5163 LT	68	* Basic data structures for the directory cache
e83c5163 LT	69	*/
	70
	71	#define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
	72	struct cache_header {
ccc4feb5 LT	73	unsigned int hdr_signature;
	74	unsigned int hdr_version;
	75	unsigned int hdr_entries;
e83c5163 LT	76	};
	77
	78	/*
	79	* The "cache_time" is just the low 32 bits of the
	80	* time. It doesn't matter if it overflows - we only
	81	* check it for equality in the 32 bits we save.
	82	*/
	83	struct cache_time {
	84	unsigned int sec;
	85	unsigned int nsec;
	86	};
	87
	88	/*
	89	* dev/ino/uid/gid/size are also just tracked to the low 32 bits
	90	* Again - this is just a (very strong in practice) heuristic that
	91	* the inode hasn't changed.
ccc4feb5 LT	92	*
	93	* We save the fields in big-endian order to allow using the
	94	* index file over NFS transparently.
e83c5163 LT	95	*/
e83c5163 LT	96	struct cache_entry {
ccc4feb5 LT	97	struct cache_time ce_ctime;
	98	struct cache_time ce_mtime;
	99	unsigned int ce_dev;
	100	unsigned int ce_ino;
	101	unsigned int ce_mode;
	102	unsigned int ce_uid;
	103	unsigned int ce_gid;
	104	unsigned int ce_size;
e83c5163	105	unsigned char sha1[20];
f5cabd13	106	unsigned short ce_flags;
2c04662d	107	char name[0];
e83c5163 LT	108	};
e83c5163 LT	109
95fd5bf8 LT	110	#define CE_NAMEMASK (0x0fff)
95fd5bf8 LT	111	#define CE_STAGEMASK (0x3000)
220a0b52	112	#define CE_UPDATE (0x4000)
aee46198	113	#define CE_STAGESHIFT 12
95fd5bf8	114
aee46198 JH	115	#define create_ce_flags(len, stage) htons((len) \| ((stage) << CE_STAGESHIFT))
	116	#define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags))
	117	#define ce_size(ce) cache_entry_size(ce_namelen(ce))
	118	#define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT)
	119
e4479470	120	#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
8ae0a8c5 KS	121	static inline unsigned int create_ce_mode(unsigned int mode)
8ae0a8c5 KS	122	{
8ae0a8c5 KS	123	if (S_ISLNK(mode))
8ae0a8c5 KS	124	return htonl(S_IFLNK);
db823d4a	125	return htonl(S_IFREG \| ce_permissions(mode));
8ae0a8c5	126	}
e4479470	127
aee46198	128	#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
f5cabd13	129
88355048 PB	130	extern struct cache_entry **active_cache;
88355048 PB	131	extern unsigned int active_nr, active_alloc, active_cache_changed;
e83c5163	132
8ac069ac JH	133	#define GIT_DIR_ENVIRONMENT "GIT_DIR"
8ac069ac JH	134	#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
d19938ab	135	#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
bb233d69	136	#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
5da5c8f4	137	#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
bb233d69	138
5da1606d	139	extern char *get_git_dir(void);
8ac069ac	140	extern char *get_object_directory(void);
95fc7512	141	extern char *get_refs_directory(void);
8ac069ac	142	extern char *get_index_file(void);
5da5c8f4	143	extern char *get_graft_file(void);
8ac069ac JH	144
8ac069ac JH	145	#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
bb233d69	146
6b5ee137	147	extern const char *get_pathspec(const char prefix, const char **pathspec);
d288a700	148	extern const char *setup_git_directory(void);
6b5ee137	149	extern const char prefix_path(const char prefix, int len, const char *path);
d288a700	150
e83c5163 LT	151	#define alloc_nr(x) (((x)+16)*3/2)
e83c5163 LT	152
734aab75	153	/* Initialize and use the cache information */
e83c5163	154	extern int read_cache(void);
197ee8c9	155	extern int write_cache(int newfd, struct cache_entry **cache, int entries);
eb38c22f	156	extern int cache_name_pos(const char *name, int namelen);
192268c1 JH	157	#define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
192268c1 JH	158	#define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
b155725d	159	#define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */
192268c1	160	extern int add_cache_entry(struct cache_entry *ce, int option);
dbbce55b	161	extern int remove_cache_entry_at(int pos);
6b5ee137	162	extern int remove_file_from_cache(const char *path);
dbbce55b	163	extern int ce_same_name(struct cache_entry a, struct cache_entry b);
5d728c84	164	extern int ce_match_stat(struct cache_entry ce, struct stat st);
b0391890	165	extern int ce_modified(struct cache_entry ce, struct stat st);
c0fd1f51	166	extern int ce_path_match(const struct cache_entry ce, const char *pathspec);
7672db20	167	extern int index_fd(unsigned char sha1, int fd, struct stat st, int write_object, const char *type);
415e96c8 JH	168	extern void fill_stat_cache_info(struct cache_entry ce, struct stat st);
	169
	170	struct cache_file {
	171	struct cache_file *next;
	172	char lockfile[PATH_MAX];
	173	};
	174	extern int hold_index_file_for_update(struct cache_file , const char path);
	175	extern int commit_index_file(struct cache_file *);
	176	extern void rollback_index_file(struct cache_file *);
734aab75 LT	177
	178	#define MTIME_CHANGED 0x0001
	179	#define CTIME_CHANGED 0x0002
	180	#define OWNER_CHANGED 0x0004
	181	#define MODE_CHANGED 0x0008
	182	#define INODE_CHANGED 0x0010
	183	#define DATA_CHANGED 0x0020
8ae0a8c5	184	#define TYPE_CHANGED 0x0040
e83c5163 LT	185
e83c5163 LT	186	/* Return a statically allocated filename matching the sha1 signature */
4ec99bf0 TS	187	extern char mkpath(const char fmt, ...) __attribute__((format (printf, 1, 2)));
4ec99bf0 TS	188	extern char git_path(const char fmt, ...) __attribute__((format (printf, 1, 2)));
73134b6d	189	extern char sha1_file_name(const unsigned char sha1);
bf592c50 DB	190	extern char sha1_pack_name(const unsigned char sha1);
bf592c50 DB	191	extern char sha1_pack_index_name(const unsigned char sha1);
88cd621d	192	extern const unsigned char null_sha1[20];
e83c5163	193
f2db68ed HE	194	int git_mkstemp(char path, size_t n, const char template);
f2db68ed HE	195
b2cb9425	196	int safe_create_leading_directories(char *path);
f2db68ed	197	char safe_strncpy(char , const char *, size_t);
b2cb9425	198
e83c5163	199	/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
c4483576	200	extern int unpack_sha1_header(z_stream stream, void map, unsigned long mapsize, void *buffer, unsigned long size);
5180cacc	201	extern int parse_sha1_header(char hdr, char type, unsigned long *sizep);
36e4d74a	202	extern int sha1_object_info(const unsigned char , char , unsigned long *);
2ade9340	203	extern void * unpack_sha1_file(void map, unsigned long mapsize, char type, unsigned long *size);
73134b6d	204	extern void * read_sha1_file(const unsigned char sha1, char type, unsigned long *size);
bf0f910d	205	extern int write_sha1_file(void buf, unsigned long len, const char type, unsigned char *return_sha1);
7672db20 BL	206	extern char write_sha1_file_prepare(void buf,
	207	unsigned long len,
	208	const char *type,
	209	unsigned char *sha1,
	210	unsigned char *hdr,
	211	int *hdrlen);
8237b185	212
5d6ccf5c	213	extern int check_sha1_signature(const unsigned char sha1, void buf, unsigned long size, const char *type);
e83c5163	214
94537c78	215	/* Read a tree into the cache */
3e587635	216	extern int read_tree(void buffer, unsigned long size, int stage, const char *paths);
94537c78	217
70b9829e DB	218	extern int write_sha1_from_fd(const unsigned char sha1, int fd, char buffer,
70b9829e DB	219	size_t bufsize, size_t *bufposn);
a5eda52b	220	extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
8237b185	221
dade09c2	222	extern int has_sha1_pack(const unsigned char *sha1);
8237b185 DB	223	extern int has_sha1_file(const unsigned char *sha1);
8237b185 DB	224
bf592c50 DB	225	extern int has_pack_file(const unsigned char *sha1);
	226	extern int has_pack_index(const unsigned char *sha1);
	227
e83c5163	228	/* Convert to/from hex/sha1 representation */
3c249c95	229	extern int get_sha1(const char str, unsigned char sha1);
197ee8c9 LT	230	extern int get_sha1_hex(const char hex, unsigned char sha1);
197ee8c9 LT	231	extern char sha1_to_hex(const unsigned char sha1); /* static buffer result! */
e83c5163 LT	232
e83c5163 LT	233	/* General helper functions */
90334cf7	234	extern void usage(const char *err) NORETURN;
4ec99bf0 TS	235	extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
4ec99bf0 TS	236	extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
2de381f9	237
958ba6c9	238	extern int base_name_compare(const char name1, int len1, int mode1, const char name2, int len2, int mode2);
79517a06	239	extern int cache_name_compare(const char name1, int len1, const char name2, int len2);
e83c5163	240
40469ee9	241	extern void read_object_with_reference(const unsigned char sha1,
bf0f910d	242	const char *required_type,
40469ee9 JH	243	unsigned long *size,
40469ee9 JH	244	unsigned char *sha1_ret);
f4913f91	245
f80cd783	246	const char *show_date(unsigned long time, int timezone);
2a39064c	247	int parse_date(const char date, char buf, int bufsize);
ecee9d9e ET	248	void datestamp(char *buf, int bufsize);
ecee9d9e ET	249
6aa33f40 LT	250	extern int setup_ident(void);
6aa33f40 LT	251	extern char get_ident(const char name, const char email, const char date_str);
d289d136 EB	252	extern char *git_author_info(void);
d289d136 EB	253	extern char *git_committer_info(void);
6aa33f40	254
127cfd0d	255	static inline void *xmalloc(size_t size)
812666c8 CL	256	{
	257	void *ret = malloc(size);
	258	if (!ret)
	259	die("Out of memory, malloc failed");
	260	return ret;
	261	}
	262
127cfd0d	263	static inline void xrealloc(void ptr, size_t size)
812666c8 CL	264	{
	265	void *ret = realloc(ptr, size);
	266	if (!ret)
	267	die("Out of memory, realloc failed");
	268	return ret;
	269	}
	270
127cfd0d BR	271	static inline void *xcalloc(size_t nmemb, size_t size)
	272	{
	273	void *ret = calloc(nmemb, size);
	274	if (!ret)
	275	die("Out of memory, calloc failed");
	276	return ret;
	277	}
	278
12dccc16 LT	279	struct checkout {
	280	const char *base_dir;
	281	int base_dir_len;
	282	unsigned force:1,
	283	quiet:1,
	284	not_new:1,
	285	refresh_cache:1;
	286	};
	287
	288	extern int checkout_entry(struct cache_entry ce, struct checkout state);
	289
9a217f2a	290	extern struct alternate_object_database {
d5a63b99	291	struct alternate_object_database *next;
9a217f2a	292	char *name;
2c04662d	293	char base[0]; /* more */
d5a63b99	294	} *alt_odb_list;
9a217f2a JH	295	extern void prepare_alt_odb(void);
	296
	297	extern struct packed_git {
	298	struct packed_git *next;
	299	unsigned long index_size;
	300	unsigned long pack_size;
	301	unsigned int *index_base;
	302	void *pack_base;
	303	unsigned int pack_last_used;
f9253394	304	unsigned int pack_use_cnt;
bf592c50	305	unsigned char sha1[20];
2c04662d	306	char pack_name[0]; /* something like ".git/objects/pack/xxxxx.pack" */
9a217f2a	307	} *packed_git;
f3bf9224 JH	308
	309	struct pack_entry {
	310	unsigned int offset;
	311	unsigned char sha1[20];
	312	struct packed_git *p;
	313	};
	314
d1c133f5 LT	315	struct ref {
	316	struct ref *next;
	317	unsigned char old_sha1[20];
	318	unsigned char new_sha1[20];
ff27adf3	319	unsigned char force;
f88395ac	320	struct ref peer_ref; / when renaming */
2c04662d	321	char name[0];
d1c133f5 LT	322	};
d1c133f5 LT	323
f7192598 LT	324	extern int git_connect(int fd[2], char url, const char prog);
f7192598 LT	325	extern int finish_connect(pid_t pid);
013e7c7f	326	extern int path_match(const char path, int nr, char *match);
f88395ac JH	327	extern int match_refs(struct ref src, struct ref dst, struct ref ***dst_tail,
f88395ac JH	328	int nr_refspec, char **refspec, int all);
41cb7488	329	extern int get_ack(int fd, unsigned char *result_sha1);
d1c133f5	330	extern struct ref get_remote_heads(int in, struct ref list, int nr_match, char **match);
f7192598	331
bf592c50	332	extern struct packed_git parse_pack_index(unsigned char sha1);
2ab141a2	333	extern struct packed_git parse_pack_index_file(const unsigned char sha1,
c508df5e	334	char *idx_path);
bf592c50	335
9a217f2a	336	extern void prepare_packed_git(void);
bf592c50 DB	337	extern void install_packed_git(struct packed_git *pack);
	338
	339	extern struct packed_git find_sha1_pack(const unsigned char sha1,
	340	struct packed_git *packs);
	341
f9253394 JH	342	extern int use_packed_git(struct packed_git *);
	343	extern void unuse_packed_git(struct packed_git *);
	344	extern struct packed_git add_packed_git(char , int);
9a217f2a JH	345	extern int num_packed_objects(const struct packed_git *p);
9a217f2a JH	346	extern int nth_packed_object_sha1(const struct packed_git , int, unsigned char);
f3bf9224 JH	347	extern int find_pack_entry_one(const unsigned char , struct pack_entry , struct packed_git *);
f3bf9224 JH	348	extern void unpack_entry_gently(struct pack_entry , char , unsigned long );
ad8c80a5	349	extern void packed_object_info_detail(struct pack_entry , char , unsigned long , unsigned long , int , unsigned char );
9a217f2a	350
8f3f9b09 JH	351	/* Dumb servers support */
	352	extern int update_server_info(int);
	353
e83c5163	354	#endif /* CACHE_H */