| #include "git-compat-util.h" |
| #include "gettext.h" |
| #include "pack-mtimes.h" |
| #include "object-file.h" |
| #include "object-store.h" |
| #include "packfile.h" |
| |
| static char *pack_mtimes_filename(struct packed_git *p) |
| { |
| size_t len; |
| if (!strip_suffix(p->pack_name, ".pack", &len)) |
| BUG("pack_name does not end in .pack"); |
| return xstrfmt("%.*s.mtimes", (int)len, p->pack_name); |
| } |
| |
| #define MTIMES_HEADER_SIZE (12) |
| |
| struct mtimes_header { |
| uint32_t signature; |
| uint32_t version; |
| uint32_t hash_id; |
| }; |
| |
| static int load_pack_mtimes_file(char *mtimes_file, |
| uint32_t num_objects, |
| const uint32_t **data_p, size_t *len_p) |
| { |
| int fd, ret = 0; |
| struct stat st; |
| uint32_t *data = NULL; |
| size_t mtimes_size, expected_size; |
| struct mtimes_header header; |
| |
| fd = git_open(mtimes_file); |
| |
| if (fd < 0) { |
| ret = -1; |
| goto cleanup; |
| } |
| if (fstat(fd, &st)) { |
| ret = error_errno(_("failed to read %s"), mtimes_file); |
| goto cleanup; |
| } |
| |
| mtimes_size = xsize_t(st.st_size); |
| |
| if (mtimes_size < MTIMES_HEADER_SIZE) { |
| ret = error(_("mtimes file %s is too small"), mtimes_file); |
| goto cleanup; |
| } |
| |
| data = xmmap(NULL, mtimes_size, PROT_READ, MAP_PRIVATE, fd, 0); |
| |
| header.signature = ntohl(data[0]); |
| header.version = ntohl(data[1]); |
| header.hash_id = ntohl(data[2]); |
| |
| if (header.signature != MTIMES_SIGNATURE) { |
| ret = error(_("mtimes file %s has unknown signature"), mtimes_file); |
| goto cleanup; |
| } |
| |
| if (header.version != 1) { |
| ret = error(_("mtimes file %s has unsupported version %"PRIu32), |
| mtimes_file, header.version); |
| goto cleanup; |
| } |
| |
| if (!(header.hash_id == 1 || header.hash_id == 2)) { |
| ret = error(_("mtimes file %s has unsupported hash id %"PRIu32), |
| mtimes_file, header.hash_id); |
| goto cleanup; |
| } |
| |
| |
| expected_size = MTIMES_HEADER_SIZE; |
| expected_size = st_add(expected_size, st_mult(sizeof(uint32_t), num_objects)); |
| expected_size = st_add(expected_size, 2 * (header.hash_id == 1 ? GIT_SHA1_RAWSZ : GIT_SHA256_RAWSZ)); |
| |
| if (mtimes_size != expected_size) { |
| ret = error(_("mtimes file %s is corrupt"), mtimes_file); |
| goto cleanup; |
| } |
| |
| cleanup: |
| if (ret) { |
| if (data) |
| munmap(data, mtimes_size); |
| } else { |
| *len_p = mtimes_size; |
| *data_p = data; |
| } |
| |
| if (fd >= 0) |
| close(fd); |
| return ret; |
| } |
| |
| int load_pack_mtimes(struct packed_git *p) |
| { |
| char *mtimes_name = NULL; |
| int ret = 0; |
| |
| if (!p->is_cruft) |
| return ret; /* not a cruft pack */ |
| if (p->mtimes_map) |
| return ret; /* already loaded */ |
| |
| ret = open_pack_index(p); |
| if (ret < 0) |
| goto cleanup; |
| |
| mtimes_name = pack_mtimes_filename(p); |
| ret = load_pack_mtimes_file(mtimes_name, |
| p->num_objects, |
| &p->mtimes_map, |
| &p->mtimes_size); |
| cleanup: |
| free(mtimes_name); |
| return ret; |
| } |
| |
| uint32_t nth_packed_mtime(struct packed_git *p, uint32_t pos) |
| { |
| if (!p->mtimes_map) |
| BUG("pack .mtimes file not loaded for %s", p->pack_name); |
| if (p->num_objects <= pos) |
| BUG("pack .mtimes out-of-bounds (%"PRIu32" vs %"PRIu32")", |
| pos, p->num_objects); |
| |
| return get_be32(p->mtimes_map + pos + 3); |
| } |