X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Frrd_format.c;h=b7e3eff8b339bb242b795a647595050abf18ec73;hb=7412ab0c1230f2609313913793f9e6c0a93b28b1;hp=4e53e196481e9de2d0a9fcf50eadb4d5deed9d0d;hpb=aff0a2728543eee1ac21f3fa02f171caae8d9362;p=rrdtool.git

diff --git a/src/rrd_format.c b/src/rrd_format.c
index 4e53e19..b7e3eff 100644
--- a/src/rrd_format.c
+++ b/src/rrd_format.c
@@ -98,3 +98,16 @@ long ds_match(
     rrd_set_error("unknown data source name '%s'", ds_nam);
     return -1;
 }
+
+off_t rrd_get_header_size(
+    rrd_t *rrd)
+{
+    return sizeof(stat_head_t) + \
+        sizeof(ds_def_t) * rrd->stat_head->ds_cnt + \
+        sizeof(rra_def_t) * rrd->stat_head->rra_cnt + \
+        sizeof(time_t) + \
+        sizeof(live_head_t) + \
+        sizeof(pdp_prep_t) * rrd->stat_head->ds_cnt + \
+        sizeof(cdp_prep_t) * rrd->stat_head->ds_cnt * rrd->stat_head->rra_cnt + \
+        sizeof(rra_ptr_t) * rrd->stat_head->rra_cnt;
+}