Andrew's git - gitweb.git/blob

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