You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
67 lines
2.0 KiB
67 lines
2.0 KiB
#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" */ |
|
|
|
/* These may be overridden by command-line parameters */ |
|
extern uint32_t pack_idx_default_version; |
|
extern uint32_t pack_idx_off32_limit; |
|
|
|
/* |
|
* Packed object index header |
|
*/ |
|
struct pack_idx_header { |
|
uint32_t idx_signature; |
|
uint32_t idx_version; |
|
}; |
|
|
|
/* |
|
* Common part of object structure used for write_idx_file |
|
*/ |
|
struct pack_idx_entry { |
|
unsigned char sha1[20]; |
|
uint32_t crc32; |
|
off_t offset; |
|
}; |
|
|
|
extern const char *write_idx_file(const char *index_name, struct pack_idx_entry **objects, int nr_objects, unsigned char *sha1); |
|
|
|
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
|
|
|