+++ /dev/null
-/*
- * Copyright (C) the libgit2 contributors. All rights reserved.
- *
- * This file is part of libgit2, distributed under the GNU GPL v2 with
- * a Linking Exception. For full terms see the included COPYING file.
- */
-
-#ifndef INCLUDE_pack_h__
-#define INCLUDE_pack_h__
-
-#include "common.h"
-
-#include "git2/oid.h"
-
-#include "array.h"
-#include "map.h"
-#include "mwindow.h"
-#include "odb.h"
-#include "offmap.h"
-#include "oidmap.h"
-#include "zstream.h"
-
-/**
- * Function type for callbacks from git_pack_foreach_entry_offset.
- */
-typedef int git_pack_foreach_entry_offset_cb(
- const git_oid *id,
- off64_t offset,
- void *payload);
-
-#define GIT_PACK_FILE_MODE 0444
-
-#define PACK_SIGNATURE 0x5041434b /* "PACK" */
-#define PACK_VERSION 2
-#define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3))
-struct git_pack_header {
- uint32_t hdr_signature;
- uint32_t hdr_version;
- uint32_t hdr_entries;
-};
-
-/*
- * The first four bytes of index formats later than version 1 should
- * start with this signature, as all older git binaries would find this
- * value illegal and abort reading the file.
- *
- * This is the case because the number of objects in a packfile
- * cannot exceed 1,431,660,000 as every object would need at least
- * 3 bytes of data and the overall packfile cannot exceed 4 GiB with
- * version 1 of the index file due to the offsets limited to 32 bits.
- * Clearly the signature exceeds this maximum.
- *
- * Very old git binaries will also compare the first 4 bytes to the
- * next 4 bytes in the index and abort with a "non-monotonic index"
- * error if the second 4 byte word is smaller than the first 4
- * byte word. This would be true in the proposed future index
- * format as idx_signature would be greater than idx_version.
- */
-
-#define PACK_IDX_SIGNATURE 0xff744f63 /* "\377tOc" */
-
-struct git_pack_idx_header {
- uint32_t idx_signature;
- uint32_t idx_version;
-};
-
-typedef struct git_pack_cache_entry {
- size_t last_usage; /* enough? */
- git_atomic32 refcount;
- git_rawobj raw;
-} git_pack_cache_entry;
-
-struct pack_chain_elem {
- off64_t base_key;
- off64_t offset;
- size_t size;
- git_object_t type;
-};
-
-typedef git_array_t(struct pack_chain_elem) git_dependency_chain;
-
-#define GIT_PACK_CACHE_MEMORY_LIMIT 16 * 1024 * 1024
-#define GIT_PACK_CACHE_SIZE_LIMIT 1024 * 1024 /* don't bother caching anything over 1MB */
-
-typedef struct {
- size_t memory_used;
- size_t memory_limit;
- size_t use_ctr;
- git_mutex lock;
- git_offmap *entries;
-} git_pack_cache;
-
-struct git_pack_file {
- git_mwindow_file mwf;
- git_map index_map;
- git_mutex lock; /* protect updates to index_map */
- git_atomic32 refcount;
-
- uint32_t num_objects;
- uint32_t num_bad_objects;
- git_oid *bad_object_sha1; /* array of git_oid */
-
- int index_version;
- git_time_t mtime;
- unsigned pack_local:1, pack_keep:1, has_cache:1;
- git_oidmap *idx_cache;
- git_oid **oids;
-
- git_pack_cache bases; /* delta base cache */
-
- time_t last_freshen; /* last time the packfile was freshened */
-
- /* something like ".git/objects/pack/xxxxx.pack" */
- char pack_name[GIT_FLEX_ARRAY]; /* more */
-};
-
-/**
- * Return the position where an OID (or a prefix) would be inserted within the
- * OID Lookup Table of an .idx file. This performs binary search between the lo
- * and hi indices.
- *
- * The stride parameter is provided because .idx files version 1 store the OIDs
- * interleaved with the 4-byte file offsets of the objects within the .pack
- * file (stride = 24), whereas files with version 2 store them in a contiguous
- * flat array (stride = 20).
- */
-int git_pack__lookup_sha1(const void *oid_lookup_table, size_t stride, unsigned lo,
- unsigned hi, const unsigned char *oid_prefix);
-
-struct git_pack_entry {
- off64_t offset;
- git_oid sha1;
- struct git_pack_file *p;
-};
-
-typedef struct git_packfile_stream {
- off64_t curpos;
- int done;
- git_zstream zstream;
- struct git_pack_file *p;
- git_mwindow *mw;
-} git_packfile_stream;
-
-int git_packfile__object_header(size_t *out, unsigned char *hdr, size_t size, git_object_t type);
-
-int git_packfile__name(char **out, const char *path);
-
-int git_packfile_unpack_header(
- size_t *size_p,
- git_object_t *type_p,
- struct git_pack_file *p,
- git_mwindow **w_curs,
- off64_t *curpos);
-
-int git_packfile_resolve_header(
- size_t *size_p,
- git_object_t *type_p,
- struct git_pack_file *p,
- off64_t offset);
-
-int git_packfile_unpack(git_rawobj *obj, struct git_pack_file *p, off64_t *obj_offset);
-
-int git_packfile_stream_open(git_packfile_stream *obj, struct git_pack_file *p, off64_t curpos);
-ssize_t git_packfile_stream_read(git_packfile_stream *obj, void *buffer, size_t len);
-void git_packfile_stream_dispose(git_packfile_stream *obj);
-
-int get_delta_base(
- off64_t *delta_base_out,
- struct git_pack_file *p,
- git_mwindow **w_curs,
- off64_t *curpos,
- git_object_t type,
- off64_t delta_obj_offset);
-
-void git_packfile_free(struct git_pack_file *p, bool unlink_packfile);
-int git_packfile_alloc(struct git_pack_file **pack_out, const char *path);
-
-int git_pack_entry_find(
- struct git_pack_entry *e,
- struct git_pack_file *p,
- const git_oid *short_oid,
- size_t len);
-int git_pack_foreach_entry(
- struct git_pack_file *p,
- git_odb_foreach_cb cb,
- void *data);
-/**
- * Similar to git_pack_foreach_entry, but:
- * - It also provides the offset of the object within the
- * packfile.
- * - It does not sort the objects in any order.
- * - It retains the lock while invoking the callback.
- */
-int git_pack_foreach_entry_offset(
- struct git_pack_file *p,
- git_pack_foreach_entry_offset_cb cb,
- void *data);
-
-#endif
projects / libgit2.git / blobdiff