- added object deserialization. It seems to work, at least the stuff I sampled looked like it was properly reatored and it triggers no error condition.

- always make the top level object randomaccess when opening a JSON file for reading. Some things won't work right if this is opened for sequential access.

src/dobject.h

@@ -209,6 +209,7 @@ enum EObjectFlags
 	OF_JustSpawned		= 1 << 8,		// Thinker was spawned this tic
 	OF_SerialSuccess	= 1 << 9,		// For debugging Serialize() calls
 	OF_Sentinel			= 1 << 10,		// Object is serving as the sentinel in a ring list
+	OF_LoadedPlayer		= 1 << 11,		// this gets flagged during deserialization so that the player checks in there can be simplified.
 };
 
 template<class T> class TObjPtr;

src/dthinker.h

@@ -88,6 +88,7 @@ public:
 	static void MarkRoots();
 
 	static DThinker *FirstThinker (int statnum);
+	static bool bSerialOverride;
 
 private:
 	enum no_link_type { NO_LINK };
@@ -100,7 +101,6 @@ private:
 
 	static FThinkerList Thinkers[MAX_STATNUM+2];		// Current thinkers
 	static FThinkerList FreshThinkers[MAX_STATNUM+1];	// Newly created thinkers
-	static bool bSerialOverride;
 
 	friend struct FThinkerList;
 	friend class FThinkerIterator;

src/g_game.cpp

@@ -1857,7 +1857,7 @@ void G_DoLoadGame ()
 
 	void *data = info->CacheLump();
 	FSerializer arc;
-	if (!arc.OpenReader((const char *)data, info->LumpSize, true))
+	if (!arc.OpenReader((const char *)data, info->LumpSize))
 	{
 		Printf("Failed to access savegame info\n");
 		delete resfile;
@@ -1935,7 +1935,7 @@ void G_DoLoadGame ()
 	}
 
 	data = info->CacheLump();
-	if (!arc.OpenReader((const char *)data, info->LumpSize, true))
+	if (!arc.OpenReader((const char *)data, info->LumpSize))
 	{
 		Printf("Failed to access savegame info\n");
 		delete resfile;

src/g_level.cpp

@@ -1517,8 +1517,6 @@ void G_UnSnapshotLevel (bool hubLoad)
 		FSerializer arc;
 		if (!arc.OpenReader(&level.info->Snapshot)) return;
 
-		//if (hubLoad) arc.SetHubTravel (); // no idea if this is still needed.
-
 		G_SerializeLevel (arc, hubLoad);
 		level.FromSnapshot = true;
 

src/menu/loadsavemenu.cpp

@@ -242,7 +242,7 @@ void DLoadSaveMenu::ReadSaveStrings ()
 					}
 					void *data = info->CacheLump();
 					FSerializer arc;
-					if (arc.OpenReader((const char *)data, info->LumpSize, true))
+					if (arc.OpenReader((const char *)data, info->LumpSize))
 					{
 						int savever = 0;
 						FString engine;
@@ -537,7 +537,7 @@ void DLoadSaveMenu::ExtractSaveData (int index)
 		}
 		void *data = info->CacheLump();
 		FSerializer arc;
-		if (arc.OpenReader((const char *)data, info->LumpSize, true))
+		if (arc.OpenReader((const char *)data, info->LumpSize))
 		{
 			FString time, pcomment, comment;
 

src/serializer.cpp

@@ -27,6 +27,7 @@
 #include "po_man.h"
 #include "v_font.h"
 #include "w_zip.h"
+#include "doomerrors.h"
 
 char nulspace[1024 * 1024 * 4];
 
@@ -196,12 +197,15 @@ struct FReader
 {
 	TArray<FJSONObject> mObjects;
 	rapidjson::Document mDoc;
+	TArray<DObject *> mDObjects;
+	int mPlayers[MAXPLAYERS];
 
 	FReader(const char *buffer, size_t length, bool randomaccess)
 	{
 		rapidjson::Document doc;
 		mDoc.Parse(buffer, length);
 		mObjects.Push(FJSONObject(&mDoc, randomaccess));
+		memset(mPlayers, 0, sizeof(mPlayers));
 	}
 	
 	rapidjson::Value *FindKey(const char *key)
@@ -258,10 +262,11 @@ bool FSerializer::OpenWriter(bool pretty)
 //
 //==========================================================================
 
-bool FSerializer::OpenReader(const char *buffer, size_t length, bool randomaccess)
+bool FSerializer::OpenReader(const char *buffer, size_t length)
 {
 	if (w != nullptr || r != nullptr) return false;
-	r = new FReader(buffer, length, randomaccess);
+	r = new FReader(buffer, length, true);
+	ReadObjects();
 	return true;
 }
 
@@ -271,23 +276,23 @@ bool FSerializer::OpenReader(const char *buffer, size_t length, bool randomacces
 //
 //==========================================================================
 
-bool FSerializer::OpenReader(FCompressedBuffer *input, bool randomaccess)
+bool FSerializer::OpenReader(FCompressedBuffer *input)
 {
 	if (input->mSize <= 0 || input->mBuffer == nullptr) return false;
 	if (w != nullptr || r != nullptr) return false;
 
 	if (input->mMethod == METHOD_STORED)
 	{
-		r = new FReader((char*)input->mBuffer, input->mSize, randomaccess);
-		return true;
+		r = new FReader((char*)input->mBuffer, input->mSize, true);
 	}
 	else
 	{
 		char *unpacked = new char[input->mSize];
 		input->Decompress(unpacked);
-		r = new FReader(unpacked, input->mSize, randomaccess);
-		return true;
+		r = new FReader(unpacked, input->mSize, true);
 	}
+	ReadObjects();
+	return true;
 }
 
 //==========================================================================
@@ -400,7 +405,7 @@ bool FSerializer::BeginObject(const char *name, bool randomaccess)
 //
 //==========================================================================
 
-void FSerializer::EndObject()
+void FSerializer::EndObject(bool endwarning)
 {
 	if (isWriting())
 	{
@@ -416,6 +421,13 @@ void FSerializer::EndObject()
 	}
 	else
 	{
+		if (endwarning && !r->mObjects.Last().mRandomAccess)
+		{
+			if (r->mObjects.Last().mIterator != r->mObjects.Last().mObject->MemberEnd())
+			{
+				I_Error("Incomplete read of sequential object");
+			}
+		}
 		r->mObjects.Pop();
 	}
 }
@@ -482,6 +494,22 @@ void FSerializer::EndArray()
 	}
 }
 
+//==========================================================================
+//
+// Discards an entry (only needed for sequential access)
+//
+//==========================================================================
+
+FSerializer &FSerializer::Discard(const char *key)
+{
+	if (isReading())
+	{
+		// just get the key and advance the iterator, if present
+		if (!r->mObjects.Last().mRandomAccess) r->FindKey(key);
+	}
+	return *this;
+}
+
 //==========================================================================
 //
 // Special handler for args (because ACS specials' arg0 needs special treatment.)
@@ -760,6 +788,94 @@ void FSerializer::WriteObjects()
 	}
 }
 
+//==========================================================================
+//
+// Writes out all collected objects
+//
+//==========================================================================
+
+void FSerializer::ReadObjects()
+{
+	bool founderrors = false;
+
+	if (isReading() && BeginArray("objects"))
+	{
+		// Do not link any thinker that's being created here. This will be done by deserializing the thinker list later.
+		try
+		{
+			DThinker::bSerialOverride = true;
+			r->mDObjects.Resize(ArraySize());
+			// First create all the objects
+			for (unsigned i = 0; i < r->mDObjects.Size(); i++)
+			{
+				if (BeginObject(nullptr))
+				{
+					FString clsname;	// do not deserialize the class type directly so that we can print appropriate errors.
+
+					Serialize(*this, "classtype", clsname, nullptr);
+					PClass *cls = PClass::FindClass(clsname);
+					if (cls == nullptr)
+					{
+						Printf("Unknown object class '%d' in savegame", clsname.GetChars());
+						founderrors = true;
+					}
+					else
+					{
+						r->mDObjects[i] = cls->CreateNew();
+					}
+					EndObject();
+				}
+			}
+			// Now that everything has been created and we can retrieve the pointers we can deserialize it.
+
+			if (!founderrors)
+			{
+				// Reset to start;
+				r->mObjects.Last().mIndex = 0;
+
+				for (unsigned i = 0; i < r->mDObjects.Size(); i++)
+				{
+					if (BeginObject(nullptr))
+					{
+						Discard("classtype");
+
+						int pindex = -1;
+						Serialize(*this, "playerindex", pindex, nullptr);
+						auto obj = r->mDObjects[i];
+						if (pindex >= 0 && pindex < MAXPLAYERS)
+						{
+							obj->ObjectFlags |= OF_LoadedPlayer;
+							r->mPlayers[pindex] = int(i);
+						}
+						obj->SerializeUserVars(*this);
+						obj->Serialize(*this);
+						try
+						{
+							EndObject(true);
+						}
+						catch (CRecoverableError &err)
+						{
+							I_Error("%s\n while restoring %s", err.GetMessage(), obj->GetClass()->TypeName.GetChars());
+						}
+					}
+				}
+			}
+			EndArray();
+			DThinker::bSerialOverride = false;
+		}
+		catch(...)
+		{
+			// make sure this flag gets unset, even if something in here throws an error.
+			DThinker::bSerialOverride = false;
+			throw;
+		}
+	}
+	if (founderrors)
+	{
+		I_Error("Failed to restore all objects in savegame");
+	}
+}
+
 //==========================================================================
 //
 //
@@ -1209,7 +1325,7 @@ FSerializer &Serialize(FSerializer &arc, const char *key, FTextureID &value, FTe
 		auto val = arc.r->FindKey(key);
 		if (val != nullptr)
 		{
-			if (val->IsObject())
+			if (val->IsArray())
 			{
 				const rapidjson::Value &nameval = (*val)[0];
 				const rapidjson::Value &typeval = (*val)[1];
@@ -1251,7 +1367,7 @@ FSerializer &Serialize(FSerializer &arc, const char *key, DObject *&value, DObje
 	if (retcode) *retcode = true;
 	if (arc.isWriting())
 	{
-		if (value != nullptr)
+		if (value != nullptr && !(value->ObjectFlags & OF_EuthanizeMe))
 		{
 			int ndx;
 			if (value == WP_NOCHANGE)

src/serializer.h

@@ -16,7 +16,16 @@ struct FReader;
 extern TArray<sector_t>	loadsectors;
 extern TArray<line_t>	loadlines;
 extern TArray<side_t>	loadsides;
-extern char nulspace[];
+
+inline bool nullcmp(const void *buffer, size_t length)
+{
+	const char *p = (const char *)buffer;
+	for (; length > 0; length--)
+	{
+		if (*p++ != 0) return false;
+	}
+	return true;
+}
 
 struct NumericValue
 {
@@ -51,6 +60,8 @@ public:
 
 	int ArraySize();
 	void WriteKey(const char *key);
+	void WriteObjects();
+	void ReadObjects();
 
 public:
 
@@ -59,18 +70,18 @@ public:
 		Close();
 	}
 	bool OpenWriter(bool pretty = true);
-	bool OpenReader(const char *buffer, size_t length, bool randomaccess = false);
-	bool OpenReader(FCompressedBuffer *input, bool randomaccess = false);
+	bool OpenReader(const char *buffer, size_t length);
+	bool OpenReader(FCompressedBuffer *input);
 	void Close();
 	bool BeginObject(const char *name, bool randomaccess = false);
-	void EndObject();
+	void EndObject(bool endwarning = false);
 	bool BeginArray(const char *name);
 	void EndArray();
-	void WriteObjects();
 	unsigned GetSize(const char *group);
 	const char *GetKey();
 	const char *GetOutput(unsigned *len = nullptr);
 	FCompressedBuffer GetCompressedOutput();
+	FSerializer &Discard(const char *key);
 	FSerializer &Args(const char *key, int *args, int *defargs, int special);
 	FSerializer &Terrain(const char *key, int &terrain, int *def = nullptr);
 	FSerializer &Sprite(const char *key, int32_t &spritenum, int32_t *def);
@@ -104,7 +115,7 @@ public:
 	template<class T>
 	FSerializer &Array(const char *key, T *obj, int count, bool fullcompare = false)
 	{
-		if (fullcompare && isWriting() && !memcmp(obj, nulspace, count * sizeof(T)))
+		if (fullcompare && isWriting() && nullcmp(obj, count * sizeof(T)))
 		{
 			return *this;
 		}

src/zzz_old.cpp

@@ -174,9 +174,6 @@ void DThinker::SerializeAll(FArchive &arc, bool hubLoad)
 	}
 	else
 	{
-		// Prevent the constructor from inserting thinkers into a list.
-		bSerialOverride = true;
-
 		try
 		{
 			arc << statcount;
@@ -213,11 +210,9 @@ void DThinker::SerializeAll(FArchive &arc, bool hubLoad)
 		}
 		catch (class CDoomError &)
 		{
-			bSerialOverride = false;
 			DestroyAllThinkers();
 			throw;
 		}
-		bSerialOverride = false;
 	}
 }
 #endif