| /* |
| * Copyright (C) 2009-2012 the libgit2 contributors |
| * |
| * This file is part of libgit2, distributed under the GNU GPL v2 with |
| * a Linking Exception. For full terms see the included COPYING file. |
| */ |
| |
| #ifndef INCLUDE_pack_h__ |
| #define INCLUDE_pack_h__ |
| |
| #include "git2/oid.h" |
| |
| #include "common.h" |
| #include "map.h" |
| #include "mwindow.h" |
| #include "odb.h" |
| |
| #define GIT_PACK_FILE_MODE 0444 |
| |
| #define PACK_SIGNATURE 0x5041434b /* "PACK" */ |
| #define PACK_VERSION 2 |
| #define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3)) |
| struct git_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 git_pack_idx_header { |
| uint32_t idx_signature; |
| uint32_t idx_version; |
| }; |
| |
| struct git_pack_file { |
| git_mwindow_file mwf; |
| git_map index_map; |
| |
| uint32_t num_objects; |
| uint32_t num_bad_objects; |
| git_oid *bad_object_sha1; /* array of git_oid */ |
| |
| int index_version; |
| git_time_t mtime; |
| unsigned pack_local:1, pack_keep:1, has_cache:1; |
| git_oid sha1; |
| git_vector cache; |
| git_oid **oids; |
| |
| /* something like ".git/objects/pack/xxxxx.pack" */ |
| char pack_name[GIT_FLEX_ARRAY]; /* more */ |
| }; |
| |
| struct git_pack_entry { |
| git_off_t offset; |
| git_oid sha1; |
| struct git_pack_file *p; |
| }; |
| |
| int git_packfile_unpack_header( |
| size_t *size_p, |
| git_otype *type_p, |
| git_mwindow_file *mwf, |
| git_mwindow **w_curs, |
| git_off_t *curpos); |
| |
| int git_packfile_unpack(git_rawobj *obj, struct git_pack_file *p, git_off_t *obj_offset); |
| int packfile_unpack_compressed( |
| git_rawobj *obj, |
| struct git_pack_file *p, |
| git_mwindow **w_curs, |
| git_off_t *curpos, |
| size_t size, |
| git_otype type); |
| |
| git_off_t get_delta_base(struct git_pack_file *p, git_mwindow **w_curs, |
| git_off_t *curpos, git_otype type, |
| git_off_t delta_obj_offset); |
| |
| void packfile_free(struct git_pack_file *p); |
| int git_packfile_check(struct git_pack_file **pack_out, const char *path); |
| int git_pack_entry_find( |
| struct git_pack_entry *e, |
| struct git_pack_file *p, |
| const git_oid *short_oid, |
| size_t len); |
| int git_pack_foreach_entry( |
| struct git_pack_file *p, |
| int (*cb)(git_oid *oid, void *data), |
| void *data); |
| |
| #endif |