Andrew's git - gitweb.git/blob

   1#ifndef PACKFILE_H
   2#define PACKFILE_H
   3
   4#include "oidset.h"
   5
   6/*
   7 * Generate the filename to be used for a pack file with checksum "sha1" and
   8 * extension "ext". The result is written into the strbuf "buf", overwriting
   9 * any existing contents. A pointer to buf->buf is returned as a convenience.
  10 *
  11 * Example: odb_pack_name(out, sha1, "idx") => ".git/objects/pack/pack-1234..idx"
  12 */
  13extern char *odb_pack_name(struct strbuf *buf, const unsigned char *sha1, const char *ext);
  14
  15/*
  16 * Return the name of the (local) packfile with the specified sha1 in
  17 * its name.  The return value is a pointer to memory that is
  18 * overwritten each time this function is called.
  19 */
  20extern char *sha1_pack_name(const unsigned char *sha1);
  21
  22/*
  23 * Return the name of the (local) pack index file with the specified
  24 * sha1 in its name.  The return value is a pointer to memory that is
  25 * overwritten each time this function is called.
  26 */
  27extern char *sha1_pack_index_name(const unsigned char *sha1);
  28
  29extern struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
  30
  31typedef void each_file_in_pack_dir_fn(const char *full_path, size_t full_path_len,
  32                                      const char *file_pach, void *data);
  33void for_each_file_in_pack_dir(const char *objdir,
  34                               each_file_in_pack_dir_fn fn,
  35                               void *data);
  36
  37/* A hook to report invalid files in pack directory */
  38#define PACKDIR_FILE_PACK 1
  39#define PACKDIR_FILE_IDX 2
  40#define PACKDIR_FILE_GARBAGE 4
  41extern void (*report_garbage)(unsigned seen_bits, const char *path);
  42
  43extern void reprepare_packed_git(struct repository *r);
  44extern void install_packed_git(struct repository *r, struct packed_git *pack);
  45
  46struct packed_git *get_packed_git(struct repository *r);
  47struct list_head *get_packed_git_mru(struct repository *r);
  48
  49/*
  50 * Give a rough count of objects in the repository. This sacrifices accuracy
  51 * for speed.
  52 */
  53unsigned long approximate_object_count(void);
  54
  55extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
  56                                         struct packed_git *packs);
  57
  58extern void pack_report(void);
  59
  60/*
  61 * mmap the index file for the specified packfile (if it is not
  62 * already mmapped).  Return 0 on success.
  63 */
  64extern int open_pack_index(struct packed_git *);
  65
  66/*
  67 * munmap the index file for the specified packfile (if it is
  68 * currently mmapped).
  69 */
  70extern void close_pack_index(struct packed_git *);
  71
  72extern uint32_t get_pack_fanout(struct packed_git *p, uint32_t value);
  73
  74extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);
  75extern void close_pack_windows(struct packed_git *);
  76extern void close_pack(struct packed_git *);
  77extern void close_all_packs(struct raw_object_store *o);
  78extern void unuse_pack(struct pack_window **);
  79extern void clear_delta_base_cache(void);
  80extern struct packed_git *add_packed_git(const char *path, size_t path_len, int local);
  81
  82/*
  83 * Make sure that a pointer access into an mmap'd index file is within bounds,
  84 * and can provide at least 8 bytes of data.
  85 *
  86 * Note that this is only necessary for variable-length segments of the file
  87 * (like the 64-bit extended offset table), as we compare the size to the
  88 * fixed-length parts when we open the file.
  89 */
  90extern void check_pack_index_ptr(const struct packed_git *p, const void *ptr);
  91
  92/*
  93 * Perform binary search on a pack-index for a given oid. Packfile is expected to
  94 * have a valid pack-index.
  95 *
  96 * See 'bsearch_hash' for more information.
  97 */
  98int bsearch_pack(const struct object_id *oid, const struct packed_git *p, uint32_t *result);
  99
 100/*
 101 * Return the SHA-1 of the nth object within the specified packfile.
 102 * Open the index if it is not already open.  The return value points
 103 * at the SHA-1 within the mmapped index.  Return NULL if there is an
 104 * error.
 105 */
 106extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t n);
 107/*
 108 * Like nth_packed_object_sha1, but write the data into the object specified by
 109 * the the first argument.  Returns the first argument on success, and NULL on
 110 * error.
 111 */
 112extern const struct object_id *nth_packed_object_oid(struct object_id *, struct packed_git *, uint32_t n);
 113
 114/*
 115 * Return the offset of the nth object within the specified packfile.
 116 * The index must already be opened.
 117 */
 118extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t n);
 119
 120/*
 121 * If the object named sha1 is present in the specified packfile,
 122 * return its offset within the packfile; otherwise, return 0.
 123 */
 124extern off_t find_pack_entry_one(const unsigned char *sha1, struct packed_git *);
 125
 126extern int is_pack_valid(struct packed_git *);
 127extern void *unpack_entry(struct repository *r, struct packed_git *, off_t, enum object_type *, unsigned long *);
 128extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 129extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 130extern int unpack_object_header(struct packed_git *, struct pack_window **, off_t *, unsigned long *);
 131
 132extern void release_pack_memory(size_t);
 133
 134/* global flag to enable extra checks when accessing packed objects */
 135extern int do_check_packed_object_crc;
 136
 137extern int packed_object_info(struct repository *r,
 138                              struct packed_git *pack,
 139                              off_t offset, struct object_info *);
 140
 141extern void mark_bad_packed_object(struct packed_git *p, const unsigned char *sha1);
 142extern const struct packed_git *has_packed_and_bad(const unsigned char *sha1);
 143
 144/*
 145 * Iff a pack file in the given repository contains the object named by sha1,
 146 * return true and store its location to e.
 147 */
 148extern int find_pack_entry(struct repository *r, const struct object_id *oid, struct pack_entry *e);
 149
 150extern int has_object_pack(const struct object_id *oid);
 151
 152extern int has_pack_index(const unsigned char *sha1);
 153
 154/*
 155 * Only iterate over packs obtained from the promisor remote.
 156 */
 157#define FOR_EACH_OBJECT_PROMISOR_ONLY 2
 158
 159/*
 160 * Iterate over packed objects in both the local
 161 * repository and any alternates repositories (unless the
 162 * FOR_EACH_OBJECT_LOCAL_ONLY flag, defined in cache.h, is set).
 163 */
 164typedef int each_packed_object_fn(const struct object_id *oid,
 165                                  struct packed_git *pack,
 166                                  uint32_t pos,
 167                                  void *data);
 168extern int for_each_object_in_pack(struct packed_git *p, each_packed_object_fn, void *data);
 169extern int for_each_packed_object(each_packed_object_fn, void *, unsigned flags);
 170
 171/*
 172 * Return 1 if an object in a promisor packfile is or refers to the given
 173 * object, 0 otherwise.
 174 */
 175extern int is_promisor_object(const struct object_id *oid);
 176
 177#endif