Merge pull request yvt#848 from Tuupertunut/master

Fixed map loading with protocol 0.76.

Sources/Client/NetClient.cpp

@@ -88,6 +88,7 @@ namespace spades {
 				PacketTypeWeaponReload = 28,    // C2S2P
 				PacketTypeChangeTeam = 29,      // C2S2P
 				PacketTypeChangeWeapon = 30,    // C2S2P
+				PacketTypeMapCached = 31,       // S2C
 				PacketTypeHandShakeInit = 31,   // S2C
 				PacketTypeHandShakeReturn = 32, // C2S
 				PacketTypeVersionGet = 33,      // S2C
@@ -1299,6 +1300,16 @@ namespace spades {
 				} break;
 				case PacketTypeMapStart: {
 					// next map!
+					if (protocolVersion == 4) {
+						// The AoS 0.76 protocol allows the client to load a map from a local cache
+						// if possible. After receiving MapStart, the client should respond with
+						// MapCached to indicate whether the map with a given checksum exists in the
+						// cache or not. We don't implement a local cache, so we always ask the
+						// server to send fresh map data.
+						NetPacketWriter wri(PacketTypeMapCached);
+						wri.Write((uint8_t)0);
+						enet_peer_send(peer, 0, wri.CreatePacket());
+					}
 					client->SetWorld(NULL);
 
 					auto mapSize = reader.ReadInt();