| #include "tag.h" |
| #include "cache.h" |
| |
| const char *tag_type = "tag"; |
| |
| struct object *deref_tag(struct object *o, const char *warn, int warnlen) |
| { |
| while (o && o->type == tag_type) |
| o = parse_object(((struct tag *)o)->tagged->sha1); |
| if (!o && warn) { |
| if (!warnlen) |
| warnlen = strlen(warn); |
| error("missing object referenced by '%.*s'", warnlen, warn); |
| } |
| return o; |
| } |
| |
| struct tag *lookup_tag(const unsigned char *sha1) |
| { |
| struct object *obj = lookup_object(sha1); |
| if (!obj) { |
| struct tag *ret = xmalloc(sizeof(struct tag)); |
| memset(ret, 0, sizeof(struct tag)); |
| created_object(sha1, &ret->object); |
| ret->object.type = tag_type; |
| return ret; |
| } |
| if (!obj->type) |
| obj->type = tag_type; |
| if (obj->type != tag_type) { |
| error("Object %s is a %s, not a tree", |
| sha1_to_hex(sha1), obj->type); |
| return NULL; |
| } |
| return (struct tag *) obj; |
| } |
| |
| int parse_tag_buffer(struct tag *item, void *data, unsigned long size) |
| { |
| int typelen, taglen; |
| unsigned char object[20]; |
| const char *type_line, *tag_line, *sig_line; |
| char type[20]; |
| |
| if (item->object.parsed) |
| return 0; |
| item->object.parsed = 1; |
| |
| if (size < 64) |
| return -1; |
| if (memcmp("object ", data, 7) || get_sha1_hex(data + 7, object)) |
| return -1; |
| |
| type_line = data + 48; |
| if (memcmp("\ntype ", type_line-1, 6)) |
| return -1; |
| |
| tag_line = strchr(type_line, '\n'); |
| if (!tag_line || memcmp("tag ", ++tag_line, 4)) |
| return -1; |
| |
| sig_line = strchr(tag_line, '\n'); |
| if (!sig_line) |
| return -1; |
| sig_line++; |
| |
| typelen = tag_line - type_line - strlen("type \n"); |
| if (typelen >= 20) |
| return -1; |
| memcpy(type, type_line + 5, typelen); |
| type[typelen] = '\0'; |
| taglen = sig_line - tag_line - strlen("tag \n"); |
| item->tag = xmalloc(taglen + 1); |
| memcpy(item->tag, tag_line + 4, taglen); |
| item->tag[taglen] = '\0'; |
| |
| item->tagged = lookup_object_type(object, type); |
| if (item->tagged && track_object_refs) { |
| struct object_refs *refs = alloc_object_refs(1); |
| refs->ref[0] = item->tagged; |
| set_object_refs(&item->object, refs); |
| } |
| |
| return 0; |
| } |
| |
| int parse_tag(struct tag *item) |
| { |
| char type[20]; |
| 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 (strcmp(type, tag_type)) { |
| 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; |
| } |