Revert "Fix a crash (assert) when client set serial version < 24 in INIT command SER_FMT_VER_LOWEST is set to zero, then the test is stupid in INIT because all client works. In mapblock we check if client's serialization version is < 24, but if client sent serialization version < 24 (15 for example) the server set it and tried to send nodes, then BOOM"

nerzhul is (may?) be working on a new solution. For the moment this is reverted because old worlds cannot be loaded (see discussion on github for the commit).

This reverts commit 800d19270250bb13cc6b2d330199815bf8e96446.

src/mapblock.cpp

@@ -526,6 +526,12 @@ void MapBlock::serialize(std::ostream &os, u8 version, bool disk)
 		throw SerializationError("ERROR: Not writing dummy block.");
 	}
 
+	// Can't do this anymore; we have 16-bit dynamically allocated node IDs
+	// in memory; conversion just won't work in this direction.
+	if(version < 24)
+		throw SerializationError("MapBlock::serialize: serialization to "
+				"version < 24 not possible");
+
 	// First byte
 	u8 flags = 0;
 	if(is_underground)

src/serialization.h

@@ -30,11 +30,11 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 	--------------------------------
 
 	For map data (blocks, nodes, sectors).
-
+	
 	NOTE: The goal is to increment this so that saved maps will be
 	      loadable by any version. Other compatibility is not
 		  maintained.
-
+		  
 	0: original networked test with 1-byte nodes
 	1: update with 2-byte nodes
 	2: lighting is transmitted in param
@@ -70,7 +70,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 // Saved on disk version
 #define SER_FMT_VER_HIGHEST_WRITE 25
 // Lowest supported serialization version
-#define SER_FMT_VER_LOWEST 24
+#define SER_FMT_VER_LOWEST 0
 
 inline bool ser_ver_supported(s32 v) {
 	return v >= SER_FMT_VER_LOWEST && v <= SER_FMT_VER_HIGHEST_READ;