[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>
#ifndef NO_MMAP
#include <sys/mman.h>
#endif
#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 int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
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! */
extern int read_ref(const char *filename, unsigned char *sha1);
extern const char *resolve_ref(const char *path, unsigned char *sha1, int);
extern int create_symref(const char *git_HEAD, const char *refs_heads_master);
extern int validate_symref(const char *git_HEAD);

/* 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);

#ifdef NO_MMAP

#ifndef PROT_READ
#define PROT_READ 1
#define PROT_WRITE 2
#define MAP_PRIVATE 1
#define MAP_FAILED ((void*)-1)
#endif

extern void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset);
extern int gitfakemunmap(void *start, size_t length);

#endif

#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>
730d48a2	14	#ifndef NO_MMAP
e83c5163	15	#include <sys/mman.h>
730d48a2	16	#endif
bb233d69	17	#include <sys/param.h>
ccc4feb5	18	#include <netinet/in.h>
575f4974 LT	19	#include <sys/types.h>
575f4974 LT	20	#include <dirent.h>
e83c5163	21
cef661fc	22	#include SHA1_HEADER
e83c5163 LT	23	#include <zlib.h>
e83c5163 LT	24
9da3acfb ET	25	#if ZLIB_VERNUM < 0x1200
	26	#define deflateBound(c,s) ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
	27	#endif
	28
b6829693 ET	29	#ifdef DT_UNKNOWN
	30	#define DTYPE(de) ((de)->d_type)
	31	#else
	32	#define DT_UNKNOWN 0
	33	#define DT_DIR 1
	34	#define DT_REG 2
a15c1c60	35	#define DT_LNK 3
b6829693 ET	36	#define DTYPE(de) DT_UNKNOWN
	37	#endif
	38
90334cf7 LT	39	#ifdef __GNUC__
	40	#define NORETURN __attribute__((__noreturn__))
	41	#else
	42	#define NORETURN
4ec99bf0	43	#ifndef __attribute__
75ea6911	44	#define __attribute__(x)
4ec99bf0	45	#endif
f1d090e1	46	#endif
4ec99bf0	47
2386d658 LT	48	/*
	49	* Intensive research over the course of many years has shown that
	50	* port 9418 is totally unused by anything else. Or
	51	*
	52	* Your search - "port 9418" - did not match any documents.
	53	*
	54	* as www.google.com puts it.
ba8a4970 LT	55	*
	56	* This port has been properly assigned for git use by IANA:
	57	* git (Assigned-9418) [I06-050728-0001].
	58	*
	59	* git 9418/tcp git pack transfer service
	60	* git 9418/udp git pack transfer service
	61	*
	62	* with Linus Torvalds <torvalds@osdl.org> as the point of
	63	* contact. September 2005.
	64	*
	65	* See http://www.iana.org/assignments/port-numbers
2386d658 LT	66	*/
	67	#define DEFAULT_GIT_PORT 9418
	68
e83c5163 LT	69	/*
e83c5163 LT	70	* Basic data structures for the directory cache
e83c5163 LT	71	*/
	72
	73	#define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
	74	struct cache_header {
ccc4feb5 LT	75	unsigned int hdr_signature;
	76	unsigned int hdr_version;
	77	unsigned int hdr_entries;
e83c5163 LT	78	};
	79
	80	/*
	81	* The "cache_time" is just the low 32 bits of the
	82	* time. It doesn't matter if it overflows - we only
	83	* check it for equality in the 32 bits we save.
	84	*/
	85	struct cache_time {
	86	unsigned int sec;
	87	unsigned int nsec;
	88	};
	89
	90	/*
	91	* dev/ino/uid/gid/size are also just tracked to the low 32 bits
	92	* Again - this is just a (very strong in practice) heuristic that
	93	* the inode hasn't changed.
ccc4feb5 LT	94	*
	95	* We save the fields in big-endian order to allow using the
	96	* index file over NFS transparently.
e83c5163 LT	97	*/
e83c5163 LT	98	struct cache_entry {
ccc4feb5 LT	99	struct cache_time ce_ctime;
	100	struct cache_time ce_mtime;
	101	unsigned int ce_dev;
	102	unsigned int ce_ino;
	103	unsigned int ce_mode;
	104	unsigned int ce_uid;
	105	unsigned int ce_gid;
	106	unsigned int ce_size;
e83c5163	107	unsigned char sha1[20];
f5cabd13	108	unsigned short ce_flags;
2c04662d	109	char name[0];
e83c5163 LT	110	};
e83c5163 LT	111
95fd5bf8 LT	112	#define CE_NAMEMASK (0x0fff)
95fd5bf8 LT	113	#define CE_STAGEMASK (0x3000)
220a0b52	114	#define CE_UPDATE (0x4000)
aee46198	115	#define CE_STAGESHIFT 12
95fd5bf8	116
aee46198 JH	117	#define create_ce_flags(len, stage) htons((len) \| ((stage) << CE_STAGESHIFT))
	118	#define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags))
	119	#define ce_size(ce) cache_entry_size(ce_namelen(ce))
	120	#define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT)
	121
e4479470	122	#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
8ae0a8c5 KS	123	static inline unsigned int create_ce_mode(unsigned int mode)
8ae0a8c5 KS	124	{
8ae0a8c5 KS	125	if (S_ISLNK(mode))
8ae0a8c5 KS	126	return htonl(S_IFLNK);
db823d4a	127	return htonl(S_IFREG \| ce_permissions(mode));
8ae0a8c5	128	}
e4479470	129
aee46198	130	#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
f5cabd13	131
88355048 PB	132	extern struct cache_entry **active_cache;
88355048 PB	133	extern unsigned int active_nr, active_alloc, active_cache_changed;
e83c5163	134
8ac069ac JH	135	#define GIT_DIR_ENVIRONMENT "GIT_DIR"
8ac069ac JH	136	#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
d19938ab	137	#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
bb233d69	138	#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
5da5c8f4	139	#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
bb233d69	140
5da1606d	141	extern char *get_git_dir(void);
8ac069ac	142	extern char *get_object_directory(void);
95fc7512	143	extern char *get_refs_directory(void);
8ac069ac	144	extern char *get_index_file(void);
5da5c8f4	145	extern char *get_graft_file(void);
8ac069ac JH	146
8ac069ac JH	147	#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
bb233d69	148
6b5ee137	149	extern const char *get_pathspec(const char prefix, const char **pathspec);
d288a700	150	extern const char *setup_git_directory(void);
6b5ee137	151	extern const char prefix_path(const char prefix, int len, const char *path);
d288a700	152
e83c5163 LT	153	#define alloc_nr(x) (((x)+16)*3/2)
e83c5163 LT	154
734aab75	155	/* Initialize and use the cache information */
e83c5163	156	extern int read_cache(void);
197ee8c9	157	extern int write_cache(int newfd, struct cache_entry **cache, int entries);
eb38c22f	158	extern int cache_name_pos(const char *name, int namelen);
192268c1 JH	159	#define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
192268c1 JH	160	#define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
b155725d	161	#define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */
192268c1	162	extern int add_cache_entry(struct cache_entry *ce, int option);
dbbce55b	163	extern int remove_cache_entry_at(int pos);
6b5ee137	164	extern int remove_file_from_cache(const char *path);
dbbce55b	165	extern int ce_same_name(struct cache_entry a, struct cache_entry b);
5d728c84	166	extern int ce_match_stat(struct cache_entry ce, struct stat st);
b0391890	167	extern int ce_modified(struct cache_entry ce, struct stat st);
c0fd1f51	168	extern int ce_path_match(const struct cache_entry ce, const char *pathspec);
7672db20	169	extern int index_fd(unsigned char sha1, int fd, struct stat st, int write_object, const char *type);
ec1fcc16	170	extern int index_path(unsigned char sha1, const char path, struct stat *st, int write_object);
415e96c8 JH	171	extern void fill_stat_cache_info(struct cache_entry ce, struct stat st);
	172
	173	struct cache_file {
	174	struct cache_file *next;
	175	char lockfile[PATH_MAX];
	176	};
	177	extern int hold_index_file_for_update(struct cache_file , const char path);
	178	extern int commit_index_file(struct cache_file *);
	179	extern void rollback_index_file(struct cache_file *);
734aab75 LT	180
	181	#define MTIME_CHANGED 0x0001
	182	#define CTIME_CHANGED 0x0002
	183	#define OWNER_CHANGED 0x0004
	184	#define MODE_CHANGED 0x0008
	185	#define INODE_CHANGED 0x0010
	186	#define DATA_CHANGED 0x0020
8ae0a8c5	187	#define TYPE_CHANGED 0x0040
e83c5163 LT	188
e83c5163 LT	189	/* Return a statically allocated filename matching the sha1 signature */
4ec99bf0 TS	190	extern char mkpath(const char fmt, ...) __attribute__((format (printf, 1, 2)));
4ec99bf0 TS	191	extern char git_path(const char fmt, ...) __attribute__((format (printf, 1, 2)));
73134b6d	192	extern char sha1_file_name(const unsigned char sha1);
bf592c50 DB	193	extern char sha1_pack_name(const unsigned char sha1);
bf592c50 DB	194	extern char sha1_pack_index_name(const unsigned char sha1);
88cd621d	195	extern const unsigned char null_sha1[20];
e83c5163	196
f2db68ed HE	197	int git_mkstemp(char path, size_t n, const char template);
f2db68ed HE	198
b2cb9425	199	int safe_create_leading_directories(char *path);
f2db68ed	200	char safe_strncpy(char , const char *, size_t);
b2cb9425	201
e83c5163	202	/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
c4483576	203	extern int unpack_sha1_header(z_stream stream, void map, unsigned long mapsize, void *buffer, unsigned long size);
5180cacc	204	extern int parse_sha1_header(char hdr, char type, unsigned long *sizep);
36e4d74a	205	extern int sha1_object_info(const unsigned char , char , unsigned long *);
2ade9340	206	extern void * unpack_sha1_file(void map, unsigned long mapsize, char type, unsigned long *size);
73134b6d	207	extern void * read_sha1_file(const unsigned char sha1, char type, unsigned long *size);
bf0f910d	208	extern int write_sha1_file(void buf, unsigned long len, const char type, unsigned char *return_sha1);
7672db20 BL	209	extern char write_sha1_file_prepare(void buf,
	210	unsigned long len,
	211	const char *type,
	212	unsigned char *sha1,
	213	unsigned char *hdr,
	214	int *hdrlen);
8237b185	215
5d6ccf5c	216	extern int check_sha1_signature(const unsigned char sha1, void buf, unsigned long size, const char *type);
e83c5163	217
94537c78	218	/* Read a tree into the cache */
3e587635	219	extern int read_tree(void buffer, unsigned long size, int stage, const char *paths);
94537c78	220
70b9829e DB	221	extern int write_sha1_from_fd(const unsigned char sha1, int fd, char buffer,
70b9829e DB	222	size_t bufsize, size_t *bufposn);
a5eda52b	223	extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
8237b185	224
dade09c2	225	extern int has_sha1_pack(const unsigned char *sha1);
8237b185 DB	226	extern int has_sha1_file(const unsigned char *sha1);
8237b185 DB	227
bf592c50 DB	228	extern int has_pack_file(const unsigned char *sha1);
	229	extern int has_pack_index(const unsigned char *sha1);
	230
e83c5163	231	/* Convert to/from hex/sha1 representation */
3c249c95	232	extern int get_sha1(const char str, unsigned char sha1);
197ee8c9 LT	233	extern int get_sha1_hex(const char hex, unsigned char sha1);
197ee8c9 LT	234	extern char sha1_to_hex(const unsigned char sha1); /* static buffer result! */
ca8db142	235	extern int read_ref(const char filename, unsigned char sha1);
a876ed83	236	extern const char resolve_ref(const char path, unsigned char *sha1, int);
8098a178 JH	237	extern int create_symref(const char git_HEAD, const char refs_heads_master);
8098a178 JH	238	extern int validate_symref(const char *git_HEAD);
e83c5163 LT	239
e83c5163 LT	240	/* General helper functions */
90334cf7	241	extern void usage(const char *err) NORETURN;
4ec99bf0 TS	242	extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
4ec99bf0 TS	243	extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
2de381f9	244
958ba6c9	245	extern int base_name_compare(const char name1, int len1, int mode1, const char name2, int len2, int mode2);
79517a06	246	extern int cache_name_compare(const char name1, int len1, const char name2, int len2);
e83c5163	247
40469ee9	248	extern void read_object_with_reference(const unsigned char sha1,
bf0f910d	249	const char *required_type,
40469ee9 JH	250	unsigned long *size,
40469ee9 JH	251	unsigned char *sha1_ret);
f4913f91	252
f80cd783	253	const char *show_date(unsigned long time, int timezone);
2a39064c	254	int parse_date(const char date, char buf, int bufsize);
ecee9d9e ET	255	void datestamp(char *buf, int bufsize);
ecee9d9e ET	256
6aa33f40 LT	257	extern int setup_ident(void);
6aa33f40 LT	258	extern char get_ident(const char name, const char email, const char date_str);
d289d136 EB	259	extern char *git_author_info(void);
d289d136 EB	260	extern char *git_committer_info(void);
6aa33f40	261
127cfd0d	262	static inline void *xmalloc(size_t size)
812666c8 CL	263	{
	264	void *ret = malloc(size);
	265	if (!ret)
	266	die("Out of memory, malloc failed");
	267	return ret;
	268	}
	269
127cfd0d	270	static inline void xrealloc(void ptr, size_t size)
812666c8 CL	271	{
	272	void *ret = realloc(ptr, size);
	273	if (!ret)
	274	die("Out of memory, realloc failed");
	275	return ret;
	276	}
	277
127cfd0d BR	278	static inline void *xcalloc(size_t nmemb, size_t size)
	279	{
	280	void *ret = calloc(nmemb, size);
	281	if (!ret)
	282	die("Out of memory, calloc failed");
	283	return ret;
	284	}
	285
12dccc16 LT	286	struct checkout {
	287	const char *base_dir;
	288	int base_dir_len;
	289	unsigned force:1,
	290	quiet:1,
	291	not_new:1,
	292	refresh_cache:1;
	293	};
	294
	295	extern int checkout_entry(struct cache_entry ce, struct checkout state);
	296
9a217f2a	297	extern struct alternate_object_database {
d5a63b99	298	struct alternate_object_database *next;
9a217f2a	299	char *name;
2c04662d	300	char base[0]; /* more */
d5a63b99	301	} *alt_odb_list;
9a217f2a JH	302	extern void prepare_alt_odb(void);
	303
	304	extern struct packed_git {
	305	struct packed_git *next;
	306	unsigned long index_size;
	307	unsigned long pack_size;
	308	unsigned int *index_base;
	309	void *pack_base;
	310	unsigned int pack_last_used;
f9253394	311	unsigned int pack_use_cnt;
bf592c50	312	unsigned char sha1[20];
2c04662d	313	char pack_name[0]; /* something like ".git/objects/pack/xxxxx.pack" */
9a217f2a	314	} *packed_git;
f3bf9224 JH	315
	316	struct pack_entry {
	317	unsigned int offset;
	318	unsigned char sha1[20];
	319	struct packed_git *p;
	320	};
	321
d1c133f5 LT	322	struct ref {
	323	struct ref *next;
	324	unsigned char old_sha1[20];
	325	unsigned char new_sha1[20];
ff27adf3	326	unsigned char force;
f88395ac	327	struct ref peer_ref; / when renaming */
2c04662d	328	char name[0];
d1c133f5 LT	329	};
d1c133f5 LT	330
f7192598 LT	331	extern int git_connect(int fd[2], char url, const char prog);
f7192598 LT	332	extern int finish_connect(pid_t pid);
013e7c7f	333	extern int path_match(const char path, int nr, char *match);
f88395ac JH	334	extern int match_refs(struct ref src, struct ref dst, struct ref ***dst_tail,
f88395ac JH	335	int nr_refspec, char **refspec, int all);
41cb7488	336	extern int get_ack(int fd, unsigned char *result_sha1);
d1c133f5	337	extern struct ref get_remote_heads(int in, struct ref list, int nr_match, char **match);
f7192598	338
bf592c50	339	extern struct packed_git parse_pack_index(unsigned char sha1);
2ab141a2	340	extern struct packed_git parse_pack_index_file(const unsigned char sha1,
c508df5e	341	char *idx_path);
bf592c50	342
9a217f2a	343	extern void prepare_packed_git(void);
bf592c50 DB	344	extern void install_packed_git(struct packed_git *pack);
	345
	346	extern struct packed_git find_sha1_pack(const unsigned char sha1,
	347	struct packed_git *packs);
	348
f9253394 JH	349	extern int use_packed_git(struct packed_git *);
	350	extern void unuse_packed_git(struct packed_git *);
	351	extern struct packed_git add_packed_git(char , int);
9a217f2a JH	352	extern int num_packed_objects(const struct packed_git *p);
9a217f2a JH	353	extern int nth_packed_object_sha1(const struct packed_git , int, unsigned char);
f3bf9224 JH	354	extern int find_pack_entry_one(const unsigned char , struct pack_entry , struct packed_git *);
f3bf9224 JH	355	extern void unpack_entry_gently(struct pack_entry , char , unsigned long );
ad8c80a5	356	extern void packed_object_info_detail(struct pack_entry , char , unsigned long , unsigned long , int , unsigned char );
9a217f2a	357
8f3f9b09 JH	358	/* Dumb servers support */
	359	extern int update_server_info(int);
	360
730d48a2 JS	361	#ifdef NO_MMAP
	362
	363	#ifndef PROT_READ
	364	#define PROT_READ 1
	365	#define PROT_WRITE 2
	366	#define MAP_PRIVATE 1
	367	#define MAP_FAILED ((void*)-1)
	368	#endif
	369
	370	extern void gitfakemmap(void start, size_t length, int prot , int flags, int fd, off_t offset);
	371	extern int gitfakemunmap(void *start, size_t length);
	372
	373	#endif
	374
e83c5163	375	#endif /* CACHE_H */