+static void prepare_header(struct archiver_args *args,
+ struct ustar_header *header,
+ unsigned int mode, unsigned long size)
+{
+ sprintf(header->mode, "%07o", mode & 07777);
+ sprintf(header->size, "%011lo", S_ISREG(mode) ? size : 0);
+ sprintf(header->mtime, "%011lo", (unsigned long) args->time);
+
+ sprintf(header->uid, "%07o", 0);
+ sprintf(header->gid, "%07o", 0);
+ strlcpy(header->uname, "root", sizeof(header->uname));
+ strlcpy(header->gname, "root", sizeof(header->gname));
+ sprintf(header->devmajor, "%07o", 0);
+ sprintf(header->devminor, "%07o", 0);
+
+ memcpy(header->magic, "ustar", 6);
+ memcpy(header->version, "00", 2);
+
+ sprintf(header->chksum, "%07o", ustar_header_chksum(header));
+}
+
+static int write_extended_header(struct archiver_args *args,
+ const unsigned char *sha1,
+ const void *buffer, unsigned long size)
+{
+ struct ustar_header header;
+ unsigned int mode;
+ memset(&header, 0, sizeof(header));
+ *header.typeflag = TYPEFLAG_EXT_HEADER;
+ mode = 0100666;
+ sprintf(header.name, "%s.paxheader", sha1_to_hex(sha1));
+ prepare_header(args, &header, mode, size);
+ write_blocked(&header, sizeof(header));
+ write_blocked(buffer, size);
+ return 0;
+}
+