mirror of
https://git.proxmox.com/git/libgit2
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95 lines
2.9 KiB
C
95 lines
2.9 KiB
C
/*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2,
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* as published by the Free Software Foundation.
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*
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* In addition to the permissions in the GNU General Public License,
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* the authors give you unlimited permission to link the compiled
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* version of this file into combinations with other programs,
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* and to distribute those combinations without any restriction
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* coming from the use of this file. (The General Public License
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* restrictions do apply in other respects; for example, they cover
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* modification of the file, and distribution when not linked into
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* a combined executable.)
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*
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* This file is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef INCLUDE_pack_h__
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#define INCLUDE_pack_h__
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#include "git2/oid.h"
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#include "common.h"
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#include "map.h"
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#include "mwindow.h"
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#define PACK_SIGNATURE 0x5041434b /* "PACK" */
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#define PACK_VERSION 2
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#define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3))
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struct pack_header {
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uint32_t hdr_signature;
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uint32_t hdr_version;
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uint32_t hdr_entries;
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};
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/*
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* The first four bytes of index formats later than version 1 should
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* start with this signature, as all older git binaries would find this
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* value illegal and abort reading the file.
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*
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* This is the case because the number of objects in a packfile
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* cannot exceed 1,431,660,000 as every object would need at least
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* 3 bytes of data and the overall packfile cannot exceed 4 GiB with
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* version 1 of the index file due to the offsets limited to 32 bits.
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* Clearly the signature exceeds this maximum.
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*
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* Very old git binaries will also compare the first 4 bytes to the
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* next 4 bytes in the index and abort with a "non-monotonic index"
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* error if the second 4 byte word is smaller than the first 4
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* byte word. This would be true in the proposed future index
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* format as idx_signature would be greater than idx_version.
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*/
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#define PACK_IDX_SIGNATURE 0xff744f63 /* "\377tOc" */
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struct pack_idx_header {
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uint32_t idx_signature;
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uint32_t idx_version;
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};
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struct pack_file {
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int pack_fd;
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git_mwindow_file mwf;
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off_t pack_size;
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git_map index_map;
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uint32_t num_objects;
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uint32_t num_bad_objects;
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git_oid *bad_object_sha1; /* array of git_oid */
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int index_version;
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git_time_t mtime;
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unsigned pack_local:1, pack_keep:1;
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git_oid sha1;
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/* something like ".git/objects/pack/xxxxx.pack" */
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char pack_name[GIT_FLEX_ARRAY]; /* more */
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};
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struct pack_entry {
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off_t offset;
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git_oid sha1;
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struct pack_file *p;
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};
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#endif
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