Merge lp:~widelands-dev/widelands/map_building_packet_version into lp:widelands

[GunChleoc]

We need some compatibility code for Barbarian campaign scenario 2.

[TiborB (tiborb95)]

lgtm

review: Approve

[GunChleoc (gunchleoc)]

Thanks for the 2 reviews :)

=== modified file 'src/map_io/map_building_packet.cc'
--- src/map_io/map_building_packet.cc	2015-04-15 10:06:45 +0000
+++ src/map_io/map_building_packet.cc	2015-10-19 19:54:50 +0000
@@ -38,6 +38,8 @@
 namespace Widelands {
 
 constexpr uint16_t kCurrentPacketVersion = 3;
+constexpr uint16_t kLowestSupportedVersion = 1;
+constexpr uint16_t kPrioritiesIntroducedInVersion = 2;
 
 // constants to handle special building types
 constexpr uint8_t kTypeBuilding = 0;
@@ -55,7 +57,7 @@
 	InteractiveBase & ibase = *egbase.get_ibase();
 	try {
 		uint16_t const packet_version = fr.unsigned_16();
-		if (packet_version == kCurrentPacketVersion) {
+		if (packet_version >= kLowestSupportedVersion && packet_version <= kCurrentPacketVersion) {
 			Map & map = egbase.map();
 			uint16_t const width  = map.get_width ();
 			uint16_t const height = map.get_height();
@@ -94,7 +96,9 @@
 
 							mol.register_object<Building> (serial, *building);
 
-							read_priorities (*building, fr);
+							if (packet_version >= kPrioritiesIntroducedInVersion) {
+								read_priorities (*building, fr);
+							}
 
 							//  Reference the players tribe if in editor.
 							if (g_gr) // but not on dedicated servers ;)