Simplify buffer size calulations.

Split up fixed and dynamic parts and add them up for the final size.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/vrrpv2.rs b/src/vrrpv2.rs
index 9a8fc95..2277dd2 100644
--- a/src/vrrpv2.rs
+++ b/src/vrrpv2.rs
@@ -100,8 +100,8 @@ impl<T: AsRef<[u8]>> BytesReader for Cursor<T> {
 
 impl VRRPv2 {
     pub fn to_bytes(&self) -> Result<Vec<u8>, std::io::Error> {
-        let sz = (4 + self.count_ip_addrs) * 4;
-        let bytes: Vec<u8> = Vec::with_capacity(sz.into());
+        let sz = 16 + (self.ip_addrs.len() * 4);
+        let bytes: Vec<u8> = Vec::with_capacity(sz);
         let mut wr = Cursor::new(bytes);
         wr.write_all(
             [