#ifdef HAVE_LIBDBI
-int rrd_fetch_fn_libdbi(char *filename, enum cf_en cf_idx,
+int rrd_fetch_fn_libdbi(const char *filename, enum cf_en cf_idx,
time_t *start,time_t *end,
unsigned long *step,
unsigned long *ds_cnt,
long ds_match(
rrd_t *rrd,
char *ds_nam);
+ off_t rrd_get_header_size(
+ rrd_t *rrd);
double rrd_diff(
char *a,
char *b);