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90 lines
2.8 KiB
90 lines
2.8 KiB
#ifndef PACK_H |
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#define PACK_H |
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#include "object.h" |
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/* |
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* Packed object header |
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*/ |
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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_option { |
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unsigned flags; |
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/* flag bits */ |
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#define WRITE_IDX_VERIFY 01 /* verify only, do not write the idx file */ |
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#define WRITE_IDX_STRICT 02 |
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uint32_t version; |
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uint32_t off32_limit; |
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/* |
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* List of offsets that would fit within off32_limit but |
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* need to be written out as 64-bit entity for byte-for-byte |
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* verification. |
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*/ |
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int anomaly_alloc, anomaly_nr; |
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uint32_t *anomaly; |
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}; |
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extern void reset_pack_idx_option(struct pack_idx_option *); |
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/* |
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* Packed object index header |
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*/ |
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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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/* |
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* Common part of object structure used for write_idx_file |
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*/ |
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struct pack_idx_entry { |
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unsigned char sha1[20]; |
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uint32_t crc32; |
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off_t offset; |
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}; |
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struct progress; |
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typedef int (*verify_fn)(const unsigned char*, enum object_type, unsigned long, void*, int*); |
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extern const char *write_idx_file(const char *index_name, struct pack_idx_entry **objects, int nr_objects, const struct pack_idx_option *, unsigned char *sha1); |
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extern int check_pack_crc(struct packed_git *p, struct pack_window **w_curs, off_t offset, off_t len, unsigned int nr); |
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extern int verify_pack_index(struct packed_git *); |
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extern int verify_pack(struct packed_git *, verify_fn fn, struct progress *, uint32_t); |
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extern void fixup_pack_header_footer(int, unsigned char *, const char *, uint32_t, unsigned char *, off_t); |
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extern char *index_pack_lockfile(int fd); |
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extern int encode_in_pack_object_header(enum object_type, uintmax_t, unsigned char *); |
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#define PH_ERROR_EOF (-1) |
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#define PH_ERROR_PACK_SIGNATURE (-2) |
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#define PH_ERROR_PROTOCOL (-3) |
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extern int read_pack_header(int fd, struct pack_header *); |
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#endif
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