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53 lines
1.6 KiB
53 lines
1.6 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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/* |
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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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extern int verify_pack(struct packed_git *, int); |
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extern void fixup_pack_header_footer(int, unsigned char *, const char *, uint32_t); |
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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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