From 7750f6c673e2c828019e6faf765a36085b80e22b Mon Sep 17 00:00:00 2001
From: Remi Gacogne <remi.gacogne@powerdns.com>
Date: Mon, 27 Aug 2018 15:34:35 +0200
Subject: [PATCH] ixfrdist: Small optimization in makeAXFRPackets()

---
 pdns/ixfrdist.cc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/pdns/ixfrdist.cc b/pdns/ixfrdist.cc
index 779cb8608a..dc05c91f05 100644
--- a/pdns/ixfrdist.cc
+++ b/pdns/ixfrdist.cc
@@ -452,8 +452,11 @@ bool makeAXFRPackets(const MOADNSParser& mdp, vector<vector<uint8_t>>& packets)
     records = g_soas[mdp.d_qname].latestAXFR;
   }
 
+  packets.reserve(packets.size() + /* SOAs */ 2 + records.size());
+
   // Initial SOA
-  packets.push_back(getSOAPacket(mdp, soa));
+  const auto soaPacket = getSOAPacket(mdp, soa);
+  packets.push_back(soaPacket);
 
   for (auto const &record : records) {
     if (record.d_type == QType::SOA) {
@@ -471,7 +474,7 @@ bool makeAXFRPackets(const MOADNSParser& mdp, vector<vector<uint8_t>>& packets)
   }
 
   // Final SOA
-  packets.push_back(getSOAPacket(mdp, soa));
+  packets.push_back(soaPacket);
 
   return true;
 }
-- 
2.47.2