зеркало из https://github.com/microsoft/git.git
87 строки
2.7 KiB
C
87 строки
2.7 KiB
C
#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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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 *);
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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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