Fixed custom version not serialized into save file

Author: BenPyton

Source/ProceduralDungeon/Private/DungeonGeneratorBase.cpp

@@ -124,6 +124,42 @@ void ADungeonGeneratorBase::SerializeDungeon(FArchive& Archive)
 {
 FDungeonSaveProxyArchive ProxyArchive(Archive);
 
+static const int32 VersionMask = 0xFFFF0000; // High word for magic header, this still allows for 65536 versions
+static const int32 MagicHeader = 0x7E250000; // Magic header to dertemine if it's a valid version number
+
+int32 SavedVersion = FProceduralDungeonCustomVersion::LatestVersion;
+if (ProxyArchive.IsSaving())
+{
+int32 ValidatedVersion = (SavedVersion & ~VersionMask) | MagicHeader; // Place magic header in the version number
+ProxyArchive << ValidatedVersion;
+}
+else if (ProxyArchive.IsLoading())
+{
+SavedVersion = FProceduralDungeonCustomVersion::InitialVersion; // Fallback version if no version found
+const int64 StartPos = ProxyArchive.Tell();
+int32 PotentialVersion = 0;
+
+// Try reading an int, but guard against short streams
+if (ProxyArchive.TotalSize() - StartPos >= sizeof(int32))
+{
+ProxyArchive << PotentialVersion;
+
+if ((PotentialVersion & VersionMask) == MagicHeader) // Check if valid version (high word matches magic header)
+{
+SavedVersion = PotentialVersion & ~VersionMask; // Extract version number
+}
+else
+{
+// Not a version, rewind
+ProxyArchive.Seek(StartPos);
+}
+}
+}
+
+FCustomVersionContainer Versions;
+Versions.SetVersion(FProceduralDungeonCustomVersion::GUID, SavedVersion, TEXT("ProcDungeonVer"));
+ProxyArchive.SetCustomVersions(Versions);
+
 TUniquePtr<FArchiveFormatterType> Formatter = CreateArchiveFormatterFromArchive(ProxyArchive,
 #if WITH_EDITORONLY_DATA
 bUseJsonSave