mirror of
https://github.com/git/git.git
synced 2024-11-05 08:47:56 +01:00
8b0eca7c7b
Include a generalized fixup_pack_header_footer() in this new file.
Needed by git-repack --max-pack-size feature in a later patchset.
[sp: Moved close(pack_fd) to callers, to support index-pack, and
changed name to better indicate it is for packfiles.]
Signed-off-by: Dana L. How <danahow@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
#ifndef PACK_H
|
|
#define PACK_H
|
|
|
|
#include "object.h"
|
|
|
|
/*
|
|
* Packed object header
|
|
*/
|
|
#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" */
|
|
|
|
/*
|
|
* Packed object index header
|
|
*/
|
|
struct pack_idx_header {
|
|
uint32_t idx_signature;
|
|
uint32_t idx_version;
|
|
};
|
|
|
|
|
|
extern int verify_pack(struct packed_git *, int);
|
|
extern void fixup_pack_header_footer(int, unsigned char *, const char *, uint32_t);
|
|
|
|
#define PH_ERROR_EOF (-1)
|
|
#define PH_ERROR_PACK_SIGNATURE (-2)
|
|
#define PH_ERROR_PROTOCOL (-3)
|
|
extern int read_pack_header(int fd, struct pack_header *);
|
|
#endif
|