git / pack.h

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Linus Torvalds a733cb6 

Linus Torvalds 1974632 
Linus Torvalds a733cb6 

Junio C Hamano 29f049a 
Nicolas Pitre d60fc1c 
Linus Torvalds a733cb6 
Simon 'corecode'… bb79103 

Linus Torvalds a733cb6 

Shawn O. Pearce df1b059 
Nicolas Pitre 4287307 

Shawn O. Pearce df1b059 

Nicolas Pitre 4287307 

Shawn O. Pearce df1b059 

Geert Bosch aa7e44b 

Nicolas Pitre 4287307 

Geert Bosch aa7e44b 

Linus Torvalds 3bb7256 
Nicolas Pitre c41a4a9 
Shawn O. Pearce 9b0aa72 
Nicolas Pitre 77d3ece 
Nicolas Pitre abeb40e 
Shawn O. Pearce 106764e 
Nicolas Pitre f965c52 
Junio C Hamano a69e542 

Linus Torvalds a733cb6 
#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 check_pack_crc(struct packed_git *p, struct pack_window **w_curs, off_t offset, off_t len, unsigned int nr);
extern int verify_pack_index(struct packed_git *);
extern int verify_pack(struct packed_git *);
extern void fixup_pack_header_footer(int, unsigned char *, const char *, uint32_t, unsigned char *, off_t);
extern char *index_pack_lockfile(int fd);
extern int encode_in_pack_object_header(enum object_type, uintmax_t, unsigned char *);

#define PH_ERROR_EOF		(-1)
#define PH_ERROR_PROTOCOL	(-3)
extern int read_pack_header(int fd, struct pack_header *);