cache.h

   1 #ifndef CACHE_H
   2 #define CACHE_H
   3
   4 #include "git-compat-util.h"
   5 #include "strbuf.h"
   6
   7 #include SHA1_HEADER
   8 #include <zlib.h>
   9
  10 #if defined(NO_DEFLATE_BOUND) || ZLIB_VERNUM < 0x1200
  11 #define deflateBound(c,s)  ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
  12 #endif
  13
  14 #if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
  15 #define DTYPE(de)       ((de)->d_type)
  16 #else
  17 #undef DT_UNKNOWN
  18 #undef DT_DIR
  19 #undef DT_REG
  20 #undef DT_LNK
  21 #define DT_UNKNOWN      0
  22 #define DT_DIR          1
  23 #define DT_REG          2
  24 #define DT_LNK          3
  25 #define DTYPE(de)       DT_UNKNOWN
  26 #endif
  27
  28 /* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
  29 #define S_IFINVALID     0030000
  30
  31 /*
  32  * A "directory link" is a link to another git directory.
  33  *
  34  * The value 0160000 is not normally a valid mode, and
  35  * also just happens to be S_IFDIR + S_IFLNK
  36  *
  37  * NOTE! We *really* shouldn't depend on the S_IFxxx macros
  38  * always having the same values everywhere. We should use
  39  * our internal git values for these things, and then we can
  40  * translate that to the OS-specific value. It just so
  41  * happens that everybody shares the same bit representation
  42  * in the UNIX world (and apparently wider too..)
  43  */
  44 #define S_IFGITLINK     0160000
  45 #define S_ISGITLINK(m)  (((m) & S_IFMT) == S_IFGITLINK)
  46
  47 /*
  48  * Intensive research over the course of many years has shown that
  49  * port 9418 is totally unused by anything else. Or
  50  *
  51  *      Your search - "port 9418" - did not match any documents.
  52  *
  53  * as www.google.com puts it.
  54  *
  55  * This port has been properly assigned for git use by IANA:
  56  * git (Assigned-9418) [I06-050728-0001].
  57  *
  58  *      git  9418/tcp   git pack transfer service
  59  *      git  9418/udp   git pack transfer service
  60  *
  61  * with Linus Torvalds <torvalds@osdl.org> as the point of
  62  * contact. September 2005.
  63  *
  64  * See http://www.iana.org/assignments/port-numbers
  65  */
  66 #define DEFAULT_GIT_PORT 9418
  67
  68 /*
  69  * Basic data structures for the directory cache
  70  */
  71
  72 #define CACHE_SIGNATURE 0x44495243      /* "DIRC" */
  73 struct cache_header {
  74         unsigned int hdr_signature;
  75         unsigned int hdr_version;
  76         unsigned int hdr_entries;
  77 };
  78
  79 /*
  80  * The "cache_time" is just the low 32 bits of the
  81  * time. It doesn't matter if it overflows - we only
  82  * check it for equality in the 32 bits we save.
  83  */
  84 struct cache_time {
  85         unsigned int sec;
  86         unsigned int nsec;
  87 };
  88
  89 /*
  90  * dev/ino/uid/gid/size are also just tracked to the low 32 bits
  91  * Again - this is just a (very strong in practice) heuristic that
  92  * the inode hasn't changed.
  93  *
  94  * We save the fields in big-endian order to allow using the
  95  * index file over NFS transparently.
  96  */
  97 struct cache_entry {
  98         struct cache_time ce_ctime;
  99         struct cache_time ce_mtime;
 100         unsigned int ce_dev;
 101         unsigned int ce_ino;
 102         unsigned int ce_mode;
 103         unsigned int ce_uid;
 104         unsigned int ce_gid;
 105         unsigned int ce_size;
 106         unsigned char sha1[20];
 107         unsigned short ce_flags;
 108         char name[FLEX_ARRAY]; /* more */
 109 };
 110
 111 #define CE_NAMEMASK  (0x0fff)
 112 #define CE_STAGEMASK (0x3000)
 113 #define CE_UPDATE    (0x4000)
 114 #define CE_VALID     (0x8000)
 115 #define CE_STAGESHIFT 12
 116
 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
 122 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
 123 static inline unsigned int create_ce_mode(unsigned int mode)
 124 {
 125         if (S_ISLNK(mode))
 126                 return htonl(S_IFLNK);
 127         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 128                 return htonl(S_IFGITLINK);
 129         return htonl(S_IFREG | ce_permissions(mode));
 130 }
 131 static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
 132 {
 133         extern int trust_executable_bit, has_symlinks;
 134         if (!has_symlinks && S_ISREG(mode) &&
 135             ce && S_ISLNK(ntohl(ce->ce_mode)))
 136                 return ce->ce_mode;
 137         if (!trust_executable_bit && S_ISREG(mode)) {
 138                 if (ce && S_ISREG(ntohl(ce->ce_mode)))
 139                         return ce->ce_mode;
 140                 return create_ce_mode(0666);
 141         }
 142         return create_ce_mode(mode);
 143 }
 144 #define canon_mode(mode) \
 145         (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
 146         S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK)
 147
 148 #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
 149
 150 struct index_state {
 151         struct cache_entry **cache;
 152         unsigned int cache_nr, cache_alloc, cache_changed;
 153         struct cache_tree *cache_tree;
 154         time_t timestamp;
 155         void *mmap;
 156         size_t mmap_size;
 157 };
 158
 159 extern struct index_state the_index;
 160
 161 #ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
 162 #define active_cache (the_index.cache)
 163 #define active_nr (the_index.cache_nr)
 164 #define active_alloc (the_index.cache_alloc)
 165 #define active_cache_changed (the_index.cache_changed)
 166 #define active_cache_tree (the_index.cache_tree)
 167
 168 #define read_cache() read_index(&the_index)
 169 #define read_cache_from(path) read_index_from(&the_index, (path))
 170 #define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
 171 #define discard_cache() discard_index(&the_index)
 172 #define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 173 #define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
 174 #define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
 175 #define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
 176 #define add_file_to_cache(path, verbose) add_file_to_index(&the_index, (path), (verbose))
 177 #define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL)
 178 #define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
 179 #define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
 180 #endif
 181
 182 enum object_type {
 183         OBJ_BAD = -1,
 184         OBJ_NONE = 0,
 185         OBJ_COMMIT = 1,
 186         OBJ_TREE = 2,
 187         OBJ_BLOB = 3,
 188         OBJ_TAG = 4,
 189         /* 5 for future expansion */
 190         OBJ_OFS_DELTA = 6,
 191         OBJ_REF_DELTA = 7,
 192         OBJ_MAX,
 193 };
 194
 195 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
 196 #define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
 197 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 198 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 199 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 200 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 201 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 202 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
 203 #define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL"
 204 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 205 #define GITATTRIBUTES_FILE ".gitattributes"
 206 #define INFOATTRIBUTES_FILE "info/attributes"
 207 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
 208
 209 extern int is_bare_repository_cfg;
 210 extern int is_bare_repository(void);
 211 extern int is_inside_git_dir(void);
 212 extern char *git_work_tree_cfg;
 213 extern int is_inside_work_tree(void);
 214 extern const char *get_git_dir(void);
 215 extern char *get_object_directory(void);
 216 extern char *get_refs_directory(void);
 217 extern char *get_index_file(void);
 218 extern char *get_graft_file(void);
 219 extern int set_git_dir(const char *path);
 220 extern const char *get_git_work_tree(void);
 221
 222 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 223
 224 extern const char **get_pathspec(const char *prefix, const char **pathspec);
 225 extern void setup_work_tree(void);
 226 extern const char *setup_git_directory_gently(int *);
 227 extern const char *setup_git_directory(void);
 228 extern const char *prefix_path(const char *prefix, int len, const char *path);
 229 extern const char *prefix_filename(const char *prefix, int len, const char *path);
 230 extern void verify_filename(const char *prefix, const char *name);
 231 extern void verify_non_filename(const char *prefix, const char *name);
 232
 233 #define alloc_nr(x) (((x)+16)*3/2)
 234
 235 /*
 236  * Realloc the buffer pointed at by variable 'x' so that it can hold
 237  * at least 'nr' entries; the number of entries currently allocated
 238  * is 'alloc', using the standard growing factor alloc_nr() macro.
 239  *
 240  * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
 241  */
 242 #define ALLOC_GROW(x, nr, alloc) \
 243         do { \
 244                 if ((nr) > alloc) { \
 245                         if (alloc_nr(alloc) < (nr)) \
 246                                 alloc = (nr); \
 247                         else \
 248                                 alloc = alloc_nr(alloc); \
 249                         x = xrealloc((x), alloc * sizeof(*(x))); \
 250                 } \
 251         } while(0)
 252
 253 /* Initialize and use the cache information */
 254 extern int read_index(struct index_state *);
 255 extern int read_index_from(struct index_state *, const char *path);
 256 extern int write_index(struct index_state *, int newfd);
 257 extern int discard_index(struct index_state *);
 258 extern int verify_path(const char *path);
 259 extern int index_name_pos(struct index_state *, const char *name, int namelen);
 260 #define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 261 #define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 262 #define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 263 #define ADD_CACHE_JUST_APPEND 8         /* Append only; tree.c::read_tree() */
 264 extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 265 extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 266 extern int remove_index_entry_at(struct index_state *, int pos);
 267 extern int remove_file_from_index(struct index_state *, const char *path);
 268 extern int add_file_to_index(struct index_state *, const char *path, int verbose);
 269 extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
 270 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 271
 272 /* do stat comparison even if CE_VALID is true */
 273 #define CE_MATCH_IGNORE_VALID           01
 274 /* do not check the contents but report dirty on racily-clean entries */
 275 #define CE_MATCH_RACY_IS_DIRTY  02
 276 extern int ie_match_stat(struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 277 extern int ie_modified(struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 278
 279 extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 280 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
 281 extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
 282 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 283 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 284
 285 #define REFRESH_REALLY          0x0001  /* ignore_valid */
 286 #define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 287 #define REFRESH_QUIET           0x0004  /* be quiet about it */
 288 #define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 289 extern int refresh_index(struct index_state *, unsigned int flags, const char **pathspec, char *seen);
 290
 291 struct lock_file {
 292         struct lock_file *next;
 293         int fd;
 294         pid_t owner;
 295         char on_list;
 296         char filename[PATH_MAX];
 297 };
 298 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 299 extern int commit_lock_file(struct lock_file *);
 300
 301 extern int hold_locked_index(struct lock_file *, int);
 302 extern int commit_locked_index(struct lock_file *);
 303 extern void set_alternate_index_output(const char *);
 304
 305 extern void rollback_lock_file(struct lock_file *);
 306 extern int delete_ref(const char *, const unsigned char *sha1);
 307
 308 /* Environment bits from configuration mechanism */
 309 extern int trust_executable_bit;
 310 extern int quote_path_fully;
 311 extern int has_symlinks;
 312 extern int assume_unchanged;
 313 extern int prefer_symlink_refs;
 314 extern int log_all_ref_updates;
 315 extern int warn_ambiguous_refs;
 316 extern int shared_repository;
 317 extern const char *apply_default_whitespace;
 318 extern int zlib_compression_level;
 319 extern int core_compression_level;
 320 extern int core_compression_seen;
 321 extern size_t packed_git_window_size;
 322 extern size_t packed_git_limit;
 323 extern size_t delta_base_cache_limit;
 324 extern int auto_crlf;
 325
 326 #define GIT_REPO_VERSION 0
 327 extern int repository_format_version;
 328 extern int check_repository_format(void);
 329
 330 #define MTIME_CHANGED   0x0001
 331 #define CTIME_CHANGED   0x0002
 332 #define OWNER_CHANGED   0x0004
 333 #define MODE_CHANGED    0x0008
 334 #define INODE_CHANGED   0x0010
 335 #define DATA_CHANGED    0x0020
 336 #define TYPE_CHANGED    0x0040
 337
 338 /* Return a statically allocated filename matching the sha1 signature */
 339 extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 340 extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 341 extern char *sha1_file_name(const unsigned char *sha1);
 342 extern char *sha1_pack_name(const unsigned char *sha1);
 343 extern char *sha1_pack_index_name(const unsigned char *sha1);
 344 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 345 extern const unsigned char null_sha1[20];
 346 static inline int is_null_sha1(const unsigned char *sha1)
 347 {
 348         return !memcmp(sha1, null_sha1, 20);
 349 }
 350 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 351 {
 352         return memcmp(sha1, sha2, 20);
 353 }
 354 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 355 {
 356         memcpy(sha_dst, sha_src, 20);
 357 }
 358 static inline void hashclr(unsigned char *hash)
 359 {
 360         memset(hash, 0, 20);
 361 }
 362
 363 int git_mkstemp(char *path, size_t n, const char *template);
 364
 365 enum sharedrepo {
 366         PERM_UMASK = 0,
 367         PERM_GROUP,
 368         PERM_EVERYBODY
 369 };
 370 int git_config_perm(const char *var, const char *value);
 371 int adjust_shared_perm(const char *path);
 372 int safe_create_leading_directories(char *path);
 373 char *enter_repo(char *path, int strict);
 374 static inline int is_absolute_path(const char *path)
 375 {
 376         return path[0] == '/';
 377 }
 378 const char *make_absolute_path(const char *path);
 379
 380 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 381 extern int sha1_object_info(const unsigned char *, unsigned long *);
 382 extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
 383 extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 384 extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 385 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 386
 387 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 388
 389 extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 390                               size_t bufsize, size_t *bufposn);
 391 extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
 392 extern int move_temp_to_file(const char *tmpfile, const char *filename);
 393
 394 extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
 395 extern int has_sha1_file(const unsigned char *sha1);
 396
 397 extern int has_pack_file(const unsigned char *sha1);
 398 extern int has_pack_index(const unsigned char *sha1);
 399
 400 extern const signed char hexval_table[256];
 401 static inline unsigned int hexval(unsigned char c)
 402 {
 403         return hexval_table[c];
 404 }
 405
 406 /* Convert to/from hex/sha1 representation */
 407 #define MINIMUM_ABBREV 4
 408 #define DEFAULT_ABBREV 7
 409
 410 extern int get_sha1(const char *str, unsigned char *sha1);
 411 extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
 412 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 413 extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 414 extern int read_ref(const char *filename, unsigned char *sha1);
 415 extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
 416 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 417 extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 418
 419 extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 420 extern int validate_headref(const char *ref);
 421
 422 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 423 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 424
 425 extern void *read_object_with_reference(const unsigned char *sha1,
 426                                         const char *required_type,
 427                                         unsigned long *size,
 428                                         unsigned char *sha1_ret);
 429
 430 enum date_mode {
 431         DATE_NORMAL = 0,
 432         DATE_RELATIVE,
 433         DATE_SHORT,
 434         DATE_LOCAL,
 435         DATE_ISO8601,
 436         DATE_RFC2822
 437 };
 438
 439 const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 440 int parse_date(const char *date, char *buf, int bufsize);
 441 void datestamp(char *buf, int bufsize);
 442 unsigned long approxidate(const char *);
 443 enum date_mode parse_date_format(const char *format);
 444
 445 extern const char *git_author_info(int);
 446 extern const char *git_committer_info(int);
 447 extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 448
 449 struct checkout {
 450         const char *base_dir;
 451         int base_dir_len;
 452         unsigned force:1,
 453                  quiet:1,
 454                  not_new:1,
 455                  refresh_cache:1;
 456 };
 457
 458 extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
 459 extern int has_symlink_leading_path(const char *name, char *last_symlink);
 460
 461 extern struct alternate_object_database {
 462         struct alternate_object_database *next;
 463         char *name;
 464         char base[FLEX_ARRAY]; /* more */
 465 } *alt_odb_list;
 466 extern void prepare_alt_odb(void);
 467
 468 struct pack_window {
 469         struct pack_window *next;
 470         unsigned char *base;
 471         off_t offset;
 472         size_t len;
 473         unsigned int last_used;
 474         unsigned int inuse_cnt;
 475 };
 476
 477 extern struct packed_git {
 478         struct packed_git *next;
 479         struct pack_window *windows;
 480         off_t pack_size;
 481         const void *index_data;
 482         size_t index_size;
 483         uint32_t num_objects;
 484         int index_version;
 485         time_t mtime;
 486         int pack_fd;
 487         int pack_local;
 488         unsigned char sha1[20];
 489         /* something like ".git/objects/pack/xxxxx.pack" */
 490         char pack_name[FLEX_ARRAY]; /* more */
 491 } *packed_git;
 492
 493 struct pack_entry {
 494         off_t offset;
 495         unsigned char sha1[20];
 496         struct packed_git *p;
 497 };
 498
 499 struct ref {
 500         struct ref *next;
 501         unsigned char old_sha1[20];
 502         unsigned char new_sha1[20];
 503         unsigned char force;
 504         unsigned char merge;
 505         struct ref *peer_ref; /* when renaming */
 506         char name[FLEX_ARRAY]; /* more */
 507 };
 508
 509 #define REF_NORMAL      (1u << 0)
 510 #define REF_HEADS       (1u << 1)
 511 #define REF_TAGS        (1u << 2)
 512
 513 #define CONNECT_VERBOSE       (1u << 0)
 514 extern struct child_process *git_connect(int fd[2], char *url, const char *prog, int flags);
 515 extern int finish_connect(struct child_process *conn);
 516 extern int path_match(const char *path, int nr, char **match);
 517 extern int get_ack(int fd, unsigned char *result_sha1);
 518 extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
 519 extern int server_supports(const char *feature);
 520
 521 extern struct packed_git *parse_pack_index(unsigned char *sha1);
 522 extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
 523                                                 const char *idx_path);
 524
 525 extern void prepare_packed_git(void);
 526 extern void reprepare_packed_git(void);
 527 extern void install_packed_git(struct packed_git *pack);
 528
 529 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 530                                          struct packed_git *packs);
 531
 532 extern void pack_report(void);
 533 extern int open_pack_index(struct packed_git *);
 534 extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
 535 extern void unuse_pack(struct pack_window **);
 536 extern struct packed_git *add_packed_git(const char *, int, int);
 537 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
 538 extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
 539 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
 540 extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 541 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 542 extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 543 extern int matches_pack_name(struct packed_git *p, const char *name);
 544
 545 /* Dumb servers support */
 546 extern int update_server_info(int);
 547
 548 typedef int (*config_fn_t)(const char *, const char *);
 549 extern int git_default_config(const char *, const char *);
 550 extern int git_config_from_file(config_fn_t fn, const char *);
 551 extern int git_config(config_fn_t fn);
 552 extern int git_parse_long(const char *, long *);
 553 extern int git_parse_ulong(const char *, unsigned long *);
 554 extern int git_config_int(const char *, const char *);
 555 extern unsigned long git_config_ulong(const char *, const char *);
 556 extern int git_config_bool(const char *, const char *);
 557 extern int git_config_set(const char *, const char *);
 558 extern int git_config_set_multivar(const char *, const char *, const char *, int);
 559 extern int git_config_rename_section(const char *, const char *);
 560 extern const char *git_etc_gitconfig(void);
 561 extern int check_repository_format_version(const char *var, const char *value);
 562
 563 #define MAX_GITNAME (1000)
 564 extern char git_default_email[MAX_GITNAME];
 565 extern char git_default_name[MAX_GITNAME];
 566
 567 extern const char *git_commit_encoding;
 568 extern const char *git_log_output_encoding;
 569
 570 /* IO helper functions */
 571 extern void maybe_flush_or_die(FILE *, const char *);
 572 extern int copy_fd(int ifd, int ofd);
 573 extern int read_in_full(int fd, void *buf, size_t count);
 574 extern int write_in_full(int fd, const void *buf, size_t count);
 575 extern void write_or_die(int fd, const void *buf, size_t count);
 576 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 577 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
 578
 579 /* pager.c */
 580 extern void setup_pager(void);
 581 extern char *pager_program;
 582 extern int pager_in_use;
 583 extern int pager_use_color;
 584
 585 extern char *editor_program;
 586 extern char *excludes_file;
 587
 588 /* base85 */
 589 int decode_85(char *dst, const char *line, int linelen);
 590 void encode_85(char *buf, const unsigned char *data, int bytes);
 591
 592 /* alloc.c */
 593 extern void *alloc_blob_node(void);
 594 extern void *alloc_tree_node(void);
 595 extern void *alloc_commit_node(void);
 596 extern void *alloc_tag_node(void);
 597 extern void *alloc_object_node(void);
 598 extern void alloc_report(void);
 599
 600 /* trace.c */
 601 extern void trace_printf(const char *format, ...);
 602 extern void trace_argv_printf(const char **argv, int count, const char *format, ...);
 603
 604 /* convert.c */
 605 /* returns 1 if *dst was used */
 606 extern int convert_to_git(const char *path, const char *src, size_t len, struct strbuf *dst);
 607 extern int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst);
 608
 609 /* diff.c */
 610 extern int diff_auto_refresh_index;
 611
 612 /* match-trees.c */
 613 void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
 614
 615 #endif /* CACHE_H */