Send only changed node metadata to clients instead of whole mapblock (#5268)

Includes newer style changes and fixes by est31

Improve the block position de-serialization
Add type NodeMetadataMap

1 files changed, 27 insertions, 0 deletions

diff --git a/src/network/clientpackethandler.cpp b/src/network/clientpackethandler.cpp
index 1be7d4eeb..0dca4aff4 100644
--- a/src/network/clientpackethandler.cpp
+++ b/src/network/clientpackethandler.cpp
@@ -243,6 +243,33 @@ void Client::handleCommand_AddNode(NetworkPacket* pkt)
 
 	addNode(p, n, remove_metadata);
 }
+
+void Client::handleCommand_NodemetaChanged(NetworkPacket *pkt)
+{
+	if (pkt->getSize() < 1)
+		return;
+
+	std::istringstream is(pkt->readLongString(), std::ios::binary);
+	std::stringstream sstr;
+	decompressZlib(is, sstr);
+
+	NodeMetadataList meta_updates_list(false);
+	meta_updates_list.deSerialize(sstr, m_itemdef, true);
+
+	Map &map = m_env.getMap();
+	for (NodeMetadataMap::const_iterator i = meta_updates_list.begin();
+			i != meta_updates_list.end(); ++i) {
+		v3s16 pos = i->first;
+
+		if (map.isValidPosition(pos) &&
+				map.setNodeMetadata(pos, i->second))
+			continue; // Prevent from deleting metadata
+
+		// Meta couldn't be set, unused metadata
+		delete i->second;
+	}
+}
+
 void Client::handleCommand_BlockData(NetworkPacket* pkt)
 {
 	// Ignore too small packet