| #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" */ |
| |
| struct pack_idx_option { |
| unsigned flags; |
| /* flag bits */ |
| #define WRITE_IDX_VERIFY 01 |
| |
| uint32_t version; |
| uint32_t off32_limit; |
| |
| /* |
| * List of offsets that would fit within off32_limit but |
| * need to be written out as 64-bit entity for byte-for-byte |
| * verification. |
| */ |
| int anomaly_alloc, anomaly_nr; |
| uint32_t *anomaly; |
| }; |
| |
| extern void reset_pack_idx_option(struct pack_idx_option *); |
| |
| /* |
| * 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, const struct pack_idx_option *, 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_PACK_SIGNATURE (-2) |
| #define PH_ERROR_PROTOCOL (-3) |
| extern int read_pack_header(int fd, struct pack_header *); |
| #endif |