| #include "cache.h" |
| #include "tag.h" |
| #include "commit.h" |
| #include "tree.h" |
| #include "blob.h" |
| |
| #define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----" |
| #define PGP_MESSAGE "-----BEGIN PGP MESSAGE-----" |
| |
| const char *tag_type = "tag"; |
| |
| struct object *deref_tag(struct object *o, const char *warn, int warnlen) |
| { |
| while (o && o->type == OBJ_TAG) |
| if (((struct tag *)o)->tagged) |
| o = parse_object(((struct tag *)o)->tagged->sha1); |
| else |
| o = NULL; |
| if (!o && warn) { |
| if (!warnlen) |
| warnlen = strlen(warn); |
| error("missing object referenced by '%.*s'", warnlen, warn); |
| } |
| return o; |
| } |
| |
| struct object *deref_tag_noverify(struct object *o) |
| { |
| while (o && o->type == OBJ_TAG) { |
| o = parse_object(o->sha1); |
| if (o && o->type == OBJ_TAG && ((struct tag *)o)->tagged) |
| o = ((struct tag *)o)->tagged; |
| else |
| o = NULL; |
| } |
| return o; |
| } |
| |
| struct tag *lookup_tag(const unsigned char *sha1) |
| { |
| struct object *obj = lookup_object(sha1); |
| if (!obj) |
| return create_object(sha1, OBJ_TAG, alloc_tag_node()); |
| if (!obj->type) |
| obj->type = OBJ_TAG; |
| if (obj->type != OBJ_TAG) { |
| error("Object %s is a %s, not a tag", |
| sha1_to_hex(sha1), typename(obj->type)); |
| return NULL; |
| } |
| return (struct tag *) obj; |
| } |
| |
| static unsigned long parse_tag_date(const char *buf, const char *tail) |
| { |
| const char *dateptr; |
| |
| while (buf < tail && *buf++ != '>') |
| /* nada */; |
| if (buf >= tail) |
| return 0; |
| dateptr = buf; |
| while (buf < tail && *buf++ != '\n') |
| /* nada */; |
| if (buf >= tail) |
| return 0; |
| /* dateptr < buf && buf[-1] == '\n', so strtoul will stop at buf-1 */ |
| return strtoul(dateptr, NULL, 10); |
| } |
| |
| int parse_tag_buffer(struct tag *item, const void *data, unsigned long size) |
| { |
| unsigned char sha1[20]; |
| char type[20]; |
| const char *bufptr = data; |
| const char *tail = bufptr + size; |
| const char *nl; |
| |
| if (item->object.parsed) |
| return 0; |
| item->object.parsed = 1; |
| |
| if (size < 64) |
| return -1; |
| if (memcmp("object ", bufptr, 7) || get_sha1_hex(bufptr + 7, sha1) || bufptr[47] != '\n') |
| return -1; |
| bufptr += 48; /* "object " + sha1 + "\n" */ |
| |
| if (!starts_with(bufptr, "type ")) |
| return -1; |
| bufptr += 5; |
| nl = memchr(bufptr, '\n', tail - bufptr); |
| if (!nl || sizeof(type) <= (nl - bufptr)) |
| return -1; |
| strncpy(type, bufptr, nl - bufptr); |
| type[nl - bufptr] = '\0'; |
| bufptr = nl + 1; |
| |
| if (!strcmp(type, blob_type)) { |
| item->tagged = &lookup_blob(sha1)->object; |
| } else if (!strcmp(type, tree_type)) { |
| item->tagged = &lookup_tree(sha1)->object; |
| } else if (!strcmp(type, commit_type)) { |
| item->tagged = &lookup_commit(sha1)->object; |
| } else if (!strcmp(type, tag_type)) { |
| item->tagged = &lookup_tag(sha1)->object; |
| } else { |
| error("Unknown type %s", type); |
| item->tagged = NULL; |
| } |
| |
| if (bufptr + 4 < tail && starts_with(bufptr, "tag ")) |
| ; /* good */ |
| else |
| return -1; |
| bufptr += 4; |
| nl = memchr(bufptr, '\n', tail - bufptr); |
| if (!nl) |
| return -1; |
| item->tag = xmemdupz(bufptr, nl - bufptr); |
| bufptr = nl + 1; |
| |
| if (bufptr + 7 < tail && starts_with(bufptr, "tagger ")) |
| item->date = parse_tag_date(bufptr, tail); |
| else |
| item->date = 0; |
| |
| return 0; |
| } |
| |
| int parse_tag(struct tag *item) |
| { |
| enum object_type type; |
| void *data; |
| unsigned long size; |
| int ret; |
| |
| if (item->object.parsed) |
| return 0; |
| data = read_sha1_file(item->object.sha1, &type, &size); |
| if (!data) |
| return error("Could not read %s", |
| sha1_to_hex(item->object.sha1)); |
| if (type != OBJ_TAG) { |
| free(data); |
| return error("Object %s not a tag", |
| sha1_to_hex(item->object.sha1)); |
| } |
| ret = parse_tag_buffer(item, data, size); |
| free(data); |
| return ret; |
| } |
| |
| /* |
| * Look at a signed tag object, and return the offset where |
| * the embedded detached signature begins, or the end of the |
| * data when there is no such signature. |
| */ |
| size_t parse_signature(const char *buf, unsigned long size) |
| { |
| char *eol; |
| size_t len = 0; |
| while (len < size && !starts_with(buf + len, PGP_SIGNATURE) && |
| !starts_with(buf + len, PGP_MESSAGE)) { |
| eol = memchr(buf + len, '\n', size - len); |
| len += eol ? eol - (buf + len) + 1 : size - len; |
| } |
| return len; |
| } |