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git.ipfire.org Git - thirdparty/git.git/blob - pack.h
10 * Packed object header
12 #define PACK_SIGNATURE 0x5041434b /* "PACK" */
13 #define PACK_VERSION 2
14 #define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3))
16 uint32_t hdr_signature
;
22 * The first four bytes of index formats later than version 1 should
23 * start with this signature, as all older git binaries would find this
24 * value illegal and abort reading the file.
26 * This is the case because the number of objects in a packfile
27 * cannot exceed 1,431,660,000 as every object would need at least
28 * 3 bytes of data and the overall packfile cannot exceed 4 GiB with
29 * version 1 of the index file due to the offsets limited to 32 bits.
30 * Clearly the signature exceeds this maximum.
32 * Very old git binaries will also compare the first 4 bytes to the
33 * next 4 bytes in the index and abort with a "non-monotonic index"
34 * error if the second 4 byte word is smaller than the first 4
35 * byte word. This would be true in the proposed future index
36 * format as idx_signature would be greater than idx_version.
38 #define PACK_IDX_SIGNATURE 0xff744f63 /* "\377tOc" */
40 struct pack_idx_option
{
43 #define WRITE_IDX_VERIFY 01 /* verify only, do not write the idx file */
44 #define WRITE_IDX_STRICT 02
50 * List of offsets that would fit within off32_limit but
51 * need to be written out as 64-bit entity for byte-for-byte
54 int anomaly_alloc
, anomaly_nr
;
58 extern void reset_pack_idx_option(struct pack_idx_option
*);
61 * Packed object index header
63 struct pack_idx_header
{
64 uint32_t idx_signature
;
69 * Common part of object structure used for write_idx_file
71 struct pack_idx_entry
{
79 /* Note, the data argument could be NULL if object type is blob */
80 typedef int (*verify_fn
)(const struct object_id
*, enum object_type
, unsigned long, void*, int*);
82 extern const char *write_idx_file(const char *index_name
, struct pack_idx_entry
**objects
, int nr_objects
, const struct pack_idx_option
*, const unsigned char *sha1
);
83 extern int check_pack_crc(struct packed_git
*p
, struct pack_window
**w_curs
, off_t offset
, off_t len
, unsigned int nr
);
84 extern int verify_pack_index(struct packed_git
*);
85 extern int verify_pack(struct repository
*, struct packed_git
*, verify_fn fn
, struct progress
*, uint32_t);
86 extern off_t
write_pack_header(struct hashfile
*f
, uint32_t);
87 extern void fixup_pack_header_footer(int, unsigned char *, const char *, uint32_t, unsigned char *, off_t
);
88 extern char *index_pack_lockfile(int fd
);
91 * The "hdr" output buffer should be at least this big, which will handle sizes
94 #define MAX_PACK_OBJECT_HEADER 10
95 extern int encode_in_pack_object_header(unsigned char *hdr
, int hdr_len
,
96 enum object_type
, uintmax_t);
98 #define PH_ERROR_EOF (-1)
99 #define PH_ERROR_PACK_SIGNATURE (-2)
100 #define PH_ERROR_PROTOCOL (-3)
101 extern int read_pack_header(int fd
, struct pack_header
*);
103 extern struct hashfile
*create_tmp_packfile(char **pack_tmp_name
);
104 extern void finish_tmp_packfile(struct strbuf
*name_buffer
, const char *pack_tmp_name
, struct pack_idx_entry
**written_list
, uint32_t nr_written
, struct pack_idx_option
*pack_idx_opts
, unsigned char sha1
[]);