+static void bit_toggle(const char *fn, uint64_t p) {
+ uint8_t b;
+ ssize_t r;
+ int fd;
+
+ fd = open(fn, O_RDWR|O_CLOEXEC);
+ assert(fd >= 0);
+
+ r = pread(fd, &b, 1, p/8);
+ assert(r == 1);
+
+ b ^= 1 << (p % 8);
+
+ r = pwrite(fd, &b, 1, p/8);
+ assert(r == 1);
+
+ close_nointr_nofail(fd);
+}
+
+static int raw_verify(const char *fn, const char *verification_key) {
+ JournalFile *f;
+ int r;
+
+ r = journal_file_open(fn, O_RDONLY, 0666, true, !!verification_key, NULL, NULL, NULL, &f);
+ if (r < 0)
+ return r;
+
+ r = journal_file_verify(f, verification_key, NULL, NULL, NULL, false);
+ journal_file_close(f);
+
+ return r;
+}
+