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/*

* 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"

#include "odb.h"

#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;

};

struct git_pack_file {

git_mwindow_file mwf;

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 git_pack_entry {

off_t offset;

git_oid sha1;

struct git_pack_file *p;

};

int git_packfile_unpack_header(

size_t *size_p,

git_otype *type_p,

git_mwindow_file *mwf,

git_mwindow **w_curs,

off_t *curpos);

int git_packfile_unpack(git_rawobj *obj, struct git_pack_file *p, off_t *obj_offset);

off_t get_delta_base(struct git_pack_file *p, git_mwindow **w_curs,

off_t *curpos, git_otype type,

off_t delta_obj_offset);

void packfile_free(struct git_pack_file *p);

int git_packfile_check(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,

unsigned int len);

#endif