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Move the pack structs to an internal header

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This commit is contained in:
Carlos Martín Nieto 2011-07-07 10:17:40 +02:00
parent 7bfdb3d22b
commit c7c9e18388
2 changed files with 95 additions and 59 deletions
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60
src/odb_pack.c
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@ -33,68 +33,10 @@
#include "delta-apply.h"
#include "sha1_lookup.h"
#include "mwindow.h"
#include "pack.h"
#include "git2/odb_backend.h"
#define PACK_SIGNATURE 0x5041434b /* "PACK" */
#define PACK_VERSION 2
#define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3))
struct 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 pack_idx_header {
uint32_t idx_signature;
uint32_t idx_version;
};
struct pack_file {
int pack_fd;
git_mwindow_file mwf;
//git_mwindow *windows;
off_t pack_size;
git_map index_map;
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;
git_oid sha1;
/* something like ".git/objects/pack/xxxxx.pack" */
char pack_name[GIT_FLEX_ARRAY]; /* more */
};
struct pack_entry {
off_t offset;
git_oid sha1;
struct pack_file *p;
};
struct pack_backend {
git_odb_backend parent;
git_vector packs;

94
src/pack.h Normal file
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@ -0,0 +1,94 @@
/*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* as published by the Free Software Foundation.
*
* In addition to the permissions in the GNU General Public License,
* the authors give you unlimited permission to link the compiled
* version of this file into combinations with other programs,
* and to distribute those combinations without any restriction
* coming from the use of this file. (The General Public License
* restrictions do apply in other respects; for example, they cover
* modification of the file, and distribution when not linked into
* a combined executable.)
*
* This file is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDE_pack_h__
#define INCLUDE_pack_h__
#include "git2/oid.h"
#include "common.h"
#include "map.h"
#include "mwindow.h"
#define PACK_SIGNATURE 0x5041434b /* "PACK" */
#define PACK_VERSION 2
#define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3))
struct 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 pack_idx_header {
uint32_t idx_signature;
uint32_t idx_version;
};
struct pack_file {
int pack_fd;
git_mwindow_file mwf;
off_t pack_size;
git_map index_map;
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;
git_oid sha1;
/* something like ".git/objects/pack/xxxxx.pack" */
char pack_name[GIT_FLEX_ARRAY]; /* more */
};
struct pack_entry {
off_t offset;
git_oid sha1;
struct pack_file *p;
};
#endif