7 files changed, 308 insertions, 215 deletions

diff --git a/src/Chunk.cpp b/src/Chunk.cpp
index 116c0f3a0..40ffff834 100644
--- a/src/Chunk.cpp
+++ b/src/Chunk.cpp
@@ -296,6 +296,16 @@ void cChunk::SetAllData(cSetChunkData & a_SetChunkData)
 	}
 	m_BlockEntities.clear();
 	std::swap(a_SetChunkData.GetBlockEntities(), m_BlockEntities);
+
+	// Check that all block entities have a valid blocktype at their respective coords (DEBUG-mode only):
+	#ifdef _DEBUG
+		for (cBlockEntityList::iterator itr = m_BlockEntities.begin(); itr != m_BlockEntities.end(); ++itr)
+		{
+			BLOCKTYPE EntityBlockType = (*itr)->GetBlockType();
+			BLOCKTYPE WorldBlockType = GetBlock((*itr)->GetRelX(), (*itr)->GetPosY(), (*itr)->GetRelZ());
+			ASSERT(EntityBlockType == WorldBlockType);
+		}  // for itr - m_BlockEntities
+	#endif  // _DEBUG
 	
 	// Set all block entities' World variable:
 	for (cBlockEntityList::iterator itr = m_BlockEntities.begin(); itr != m_BlockEntities.end(); ++itr)
diff --git a/src/Chunk.h b/src/Chunk.h
index 72a1f6c95..e7aeff1a4 100644
--- a/src/Chunk.h
+++ b/src/Chunk.h
@@ -155,7 +155,7 @@ public:
 
 	void FastSetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, BLOCKTYPE a_BlockMeta, bool a_SendToClients = true);  // Doesn't force block updates on neighbors, use for simple changes such as grass growing etc.
 	BLOCKTYPE GetBlock(int a_RelX, int a_RelY, int a_RelZ) const;
-	BLOCKTYPE GetBlock(Vector3i a_cords) const { return GetBlock(a_cords.x, a_cords.y, a_cords.z);}
+	BLOCKTYPE GetBlock(Vector3i a_RelCords) const { return GetBlock(a_RelCords.x, a_RelCords.y, a_RelCords.z);}
 	void      GetBlockTypeMeta(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta);
 	void      GetBlockInfo    (int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_Meta, NIBBLETYPE & a_SkyLight, NIBBLETYPE & a_BlockLight);
 	
diff --git a/src/SetChunkData.cpp b/src/SetChunkData.cpp
index af6ad1251..97903074a 100644
--- a/src/SetChunkData.cpp
+++ b/src/SetChunkData.cpp
@@ -5,6 +5,7 @@
 
 #include "Globals.h"
 #include "SetChunkData.h"
+#include "BlockEntities/BlockEntity.h"
 
 
 
@@ -116,3 +117,35 @@ void cSetChunkData::CalculateHeightMap(void)
 
 
 
+
+void cSetChunkData::RemoveInvalidBlockEntities(void)
+{
+	for (cBlockEntityList::iterator itr = m_BlockEntities.begin(); itr != m_BlockEntities.end();)
+	{
+		BLOCKTYPE EntityBlockType = (*itr)->GetBlockType();
+		BLOCKTYPE WorldBlockType = cChunkDef::GetBlock(m_BlockTypes, (*itr)->GetRelX(), (*itr)->GetPosY(), (*itr)->GetRelZ());
+		if (EntityBlockType != WorldBlockType)
+		{
+			// Bad blocktype, remove the block entity:
+			LOGD("Block entity blocktype mismatch at {%d, %d, %d}: entity for blocktype %s(%d) in block %s(%d). Deleting the block entity.",
+				(*itr)->GetPosX(), (*itr)->GetPosY(), (*itr)->GetPosZ(),
+				ItemTypeToString(EntityBlockType).c_str(), EntityBlockType,
+				ItemTypeToString(WorldBlockType).c_str(),  WorldBlockType
+			);
+			cBlockEntityList::iterator itr2 = itr;
+			itr2++;
+			m_BlockEntities.erase(itr);
+			delete *itr;
+			itr = itr2;
+		}
+		else
+		{
+			// Good blocktype, keep the block entity:
+			++itr;
+		}
+	}  // for itr - m_BlockEntities[]
+}
+
+
+
+
diff --git a/src/SetChunkData.h b/src/SetChunkData.h
index a2f776f6b..03e9ef4d9 100644
--- a/src/SetChunkData.h
+++ b/src/SetChunkData.h
@@ -92,6 +92,9 @@ public:
 	/** Calculates the heightmap based on the contained blocktypes and marks it valid. */
 	void CalculateHeightMap(void);
 
+	/** Removes the block entities that don't have a proper blocktype at their corresponding coords. */
+	void RemoveInvalidBlockEntities(void);
+
 protected:
 	int m_ChunkX;
 	int m_ChunkZ;
diff --git a/src/World.cpp b/src/World.cpp
index 69d1217f1..b01e53638 100644
--- a/src/World.cpp
+++ b/src/World.cpp
@@ -3484,14 +3484,16 @@ void cWorld::cChunkGeneratorCallbacks::OnChunkGenerated(cChunkDesc & a_ChunkDesc
 	cChunkDef::BlockNibbles BlockMetas;
 	a_ChunkDesc.CompressBlockMetas(BlockMetas);
 
-	m_World->QueueSetChunkData(cSetChunkDataPtr(new cSetChunkData(
+	cSetChunkDataPtr SetChunkData(new cSetChunkData(
 		a_ChunkDesc.GetChunkX(), a_ChunkDesc.GetChunkZ(),
 		a_ChunkDesc.GetBlockTypes(), BlockMetas,
 		NULL, NULL,  // We don't have lighting, chunk will be lighted when needed
 		&a_ChunkDesc.GetHeightMap(), &a_ChunkDesc.GetBiomeMap(),
 		a_ChunkDesc.GetEntities(), a_ChunkDesc.GetBlockEntities(),
 		true
-	)));
+	));
+	SetChunkData->RemoveInvalidBlockEntities();
+	m_World->QueueSetChunkData(SetChunkData);
 }
 
 
diff --git a/src/WorldStorage/WSSAnvil.cpp b/src/WorldStorage/WSSAnvil.cpp
index a9c9ae4b5..5978e5ef8 100644
--- a/src/WorldStorage/WSSAnvil.cpp
+++ b/src/WorldStorage/WSSAnvil.cpp
@@ -396,7 +396,7 @@ bool cWSSAnvil::LoadChunkFromNBT(const cChunkCoords & a_Chunk, const cParsedNBT
 	}  // for y
 	//*/
 	
-	m_World->QueueSetChunkData(cSetChunkDataPtr(new cSetChunkData(
+	cSetChunkDataPtr SetChunkData(new cSetChunkData(
 		a_Chunk.m_ChunkX, a_Chunk.m_ChunkZ,
 		BlockTypes, MetaData,
 		IsLightValid ? BlockLight : NULL,
@@ -404,7 +404,8 @@ bool cWSSAnvil::LoadChunkFromNBT(const cChunkCoords & a_Chunk, const cParsedNBT
 		NULL, Biomes,
 		Entities, BlockEntities,
 		false
-	)));
+	));
+	m_World->QueueSetChunkData(SetChunkData);
 	return true;
 }
 
@@ -581,64 +582,32 @@ void cWSSAnvil::LoadBlockEntitiesFromNBT(cBlockEntityList & a_BlockEntities, con
 		{
 			continue;
 		}
-		int sID = a_NBT.FindChildByName(Child, "id");
-		if (sID < 0)
+
+		// Get the BlockEntity's position
+		int x, y, z;
+		if (!GetBlockEntityNBTPos(a_NBT, Child, x, y, z))
 		{
+			LOGWARNING("Bad block entity, missing the coords. Will be ignored.");
 			continue;
 		}
-		if (strncmp(a_NBT.GetData(sID), "Beacon", a_NBT.GetDataLength(sID)) == 0)
-		{
-			LoadBeaconFromNBT(a_BlockEntities, a_NBT, Child);
-		}
-		else if (strncmp(a_NBT.GetData(sID), "Chest", a_NBT.GetDataLength(sID)) == 0)
-		{
-			LoadChestFromNBT(a_BlockEntities, a_NBT, Child, E_BLOCK_CHEST);
-		}
-		else if (strncmp(a_NBT.GetData(sID), "Control", a_NBT.GetDataLength(sID)) == 0)
-		{
-			LoadCommandBlockFromNBT(a_BlockEntities, a_NBT, Child);
-		}
-		else if (strncmp(a_NBT.GetData(sID), "Dropper", a_NBT.GetDataLength(sID)) == 0)
-		{
-			LoadDropperFromNBT(a_BlockEntities, a_NBT, Child);
-		}
-		else if (strncmp(a_NBT.GetData(sID), "FlowerPot", a_NBT.GetDataLength(sID)) == 0)
-		{
-			LoadFlowerPotFromNBT(a_BlockEntities, a_NBT, Child);
-		}
-		else if (strncmp(a_NBT.GetData(sID), "Furnace", a_NBT.GetDataLength(sID)) == 0)
-		{
-			LoadFurnaceFromNBT(a_BlockEntities, a_NBT, Child, a_BlockTypes, a_BlockMetas);
-		}
-		else if (strncmp(a_NBT.GetData(sID), "Hopper", a_NBT.GetDataLength(sID)) == 0)
-		{
-			LoadHopperFromNBT(a_BlockEntities, a_NBT, Child);
-		}
-		else if (strncmp(a_NBT.GetData(sID), "Music", a_NBT.GetDataLength(sID)) == 0)
-		{
-			LoadNoteFromNBT(a_BlockEntities, a_NBT, Child);
-		}
-		else if (strncmp(a_NBT.GetData(sID), "RecordPlayer", a_NBT.GetDataLength(sID)) == 0)
-		{
-			LoadJukeboxFromNBT(a_BlockEntities, a_NBT, Child);
-		}
-		else if (strncmp(a_NBT.GetData(sID), "Sign", a_NBT.GetDataLength(sID)) == 0)
-		{
-			LoadSignFromNBT(a_BlockEntities, a_NBT, Child);
-		}
-		else if (strncmp(a_NBT.GetData(sID), "Skull", a_NBT.GetDataLength(sID)) == 0)
-		{
-			LoadMobHeadFromNBT(a_BlockEntities, a_NBT, Child);
-		}
-		else if (strncmp(a_NBT.GetData(sID), "Trap", a_NBT.GetDataLength(sID)) == 0)
+		int RelX = x, RelY = y, RelZ = z, ChunkX, ChunkZ;
+		cChunkDef::AbsoluteToRelative(RelX, RelY, RelZ, ChunkX, ChunkZ);
+		if (RelY == 2)
 		{
-			LoadDispenserFromNBT(a_BlockEntities, a_NBT, Child);
+			LOGD("HERE");
 		}
-		else if (strncmp(a_NBT.GetData(sID), "TrappedChest", a_NBT.GetDataLength(sID)) == 0)
+
+		// Load the proper BlockEntity type based on the block type:
+		BLOCKTYPE BlockType = cChunkDef::GetBlock(a_BlockTypes, RelX, RelY, RelZ);
+		NIBBLETYPE BlockMeta = cChunkDef::GetNibble(a_BlockMetas, RelX, RelY, RelZ);
+		std::auto_ptr<cBlockEntity> be(LoadBlockEntityFromNBT(a_NBT, Child, x, y, z, BlockType, BlockMeta));
+		if (be.get() == NULL)
 		{
-			LoadChestFromNBT(a_BlockEntities, a_NBT, Child, E_BLOCK_TRAPPED_CHEST);
+			continue;
 		}
-		// TODO: Other block entities
+
+		// Add the BlockEntity to the loaded data:
+		a_BlockEntities.push_back(be.release());
 	}  // for Child - tag children
 }
 
@@ -646,6 +615,52 @@ void cWSSAnvil::LoadBlockEntitiesFromNBT(cBlockEntityList & a_BlockEntities, con
 
 
 
+cBlockEntity * cWSSAnvil::LoadBlockEntityFromNBT(const cParsedNBT & a_NBT, int a_Tag, int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta)
+{
+	// Load the specific BlockEntity type:
+	switch (a_BlockType)
+	{
+		// Specific entity loaders:
+		case E_BLOCK_BEACON:        return LoadBeaconFromNBT      (a_NBT, a_Tag, a_BlockX, a_BlockY, a_BlockZ);
+		case E_BLOCK_CHEST:         return LoadChestFromNBT       (a_NBT, a_Tag, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_CHEST);
+		case E_BLOCK_COMMAND_BLOCK: return LoadCommandBlockFromNBT(a_NBT, a_Tag, a_BlockX, a_BlockY, a_BlockZ);
+		case E_BLOCK_DISPENSER:     return LoadDispenserFromNBT   (a_NBT, a_Tag, a_BlockX, a_BlockY, a_BlockZ);
+		case E_BLOCK_DROPPER:       return LoadDropperFromNBT     (a_NBT, a_Tag, a_BlockX, a_BlockY, a_BlockZ);
+		case E_BLOCK_FLOWER_POT:    return LoadFlowerPotFromNBT   (a_NBT, a_Tag, a_BlockX, a_BlockY, a_BlockZ);
+		case E_BLOCK_FURNACE:       return LoadFurnaceFromNBT     (a_NBT, a_Tag, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_FURNACE, a_BlockMeta);
+		case E_BLOCK_HEAD:          return LoadMobHeadFromNBT     (a_NBT, a_Tag, a_BlockX, a_BlockY, a_BlockZ);
+		case E_BLOCK_HOPPER:        return LoadHopperFromNBT      (a_NBT, a_Tag, a_BlockX, a_BlockY, a_BlockZ);
+		case E_BLOCK_JUKEBOX:       return LoadJukeboxFromNBT     (a_NBT, a_Tag, a_BlockX, a_BlockY, a_BlockZ);
+		case E_BLOCK_LIT_FURNACE:   return LoadFurnaceFromNBT     (a_NBT, a_Tag, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_LIT_FURNACE, a_BlockMeta);
+		case E_BLOCK_NOTE_BLOCK:    return LoadNoteBlockFromNBT   (a_NBT, a_Tag, a_BlockX, a_BlockY, a_BlockZ);
+		case E_BLOCK_SIGN_POST:     return LoadSignFromNBT        (a_NBT, a_Tag, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_SIGN_POST);
+		case E_BLOCK_TRAPPED_CHEST: return LoadChestFromNBT       (a_NBT, a_Tag, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_TRAPPED_CHEST);
+		case E_BLOCK_WALLSIGN:      return LoadSignFromNBT        (a_NBT, a_Tag, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_WALLSIGN);
+
+		// Blocktypes that have block entities but don't load their contents from disk:
+		case E_BLOCK_ENDER_CHEST:   return NULL;
+	}
+
+	// All the other blocktypes should have no entities assigned to them. Report an error:
+	// Get the "id" tag:
+	int TagID = a_NBT.FindChildByName(a_Tag, "id");
+	AString TypeName("<unknown>");
+	if (TagID >= 0)
+	{
+		TypeName.assign(a_NBT.GetData(TagID), (size_t)a_NBT.GetDataLength(TagID));
+	}
+	LOGINFO("WorldLoader(%s): Block entity mismatch: block type %s (%d), type \"%s\", at {%d, %d, %d}; the entity will be lost.",
+		m_World->GetName().c_str(),
+		ItemTypeToString(a_BlockType).c_str(), a_BlockType, TypeName.c_str(),
+		a_BlockX, a_BlockY, a_BlockZ
+	);
+	return NULL;
+}
+
+
+
+
+
 bool cWSSAnvil::LoadItemFromNBT(cItem & a_Item, const cParsedNBT & a_NBT, int a_TagIdx)
 {
 	int Type = a_NBT.FindChildByName(a_TagIdx, "id");
@@ -656,7 +671,6 @@ bool cWSSAnvil::LoadItemFromNBT(cItem & a_Item, const cParsedNBT & a_NBT, int a_
 	a_Item.m_ItemType = a_NBT.GetShort(Type);
 	if (a_Item.m_ItemType < 0)
 	{
-		LOGD("Encountered an item with negative type (%d). Replacing with an empty item.", a_NBT.GetShort(Type));
 		a_Item.Empty();
 		return true;
 	}
@@ -754,16 +768,46 @@ void cWSSAnvil::LoadItemGridFromNBT(cItemGrid & a_ItemGrid, const cParsedNBT & a
 
 
 
-void cWSSAnvil::LoadBeaconFromNBT(cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx)
+bool cWSSAnvil::CheckBlockEntityType(const cParsedNBT & a_NBT, int a_TagIdx, const char * a_ExpectedType)
 {
-	ASSERT(a_NBT.GetType(a_TagIdx) == TAG_Compound);
-	int x, y, z;
-	if (!GetBlockEntityNBTPos(a_NBT, a_TagIdx, x, y, z))
+	// Check if the given tag is a compound:
+	if (a_NBT.GetType(a_TagIdx) != TAG_Compound)
 	{
-		return;
+		return false;
 	}
 
-	std::auto_ptr<cBeaconEntity> Beacon(new cBeaconEntity(x, y, z, m_World));
+	// Get the "id" tag:
+	int TagID = a_NBT.FindChildByName(a_TagIdx, "id");
+	if (TagID < 0)
+	{
+		return false;
+	}
+
+	// Compare the value:
+	if (strncmp(a_NBT.GetData(TagID), a_ExpectedType, (size_t)a_NBT.GetDataLength(TagID)) == 0)
+	{
+		return true;
+	}
+	LOGWARNING("Block entity type mismatch: exp \"%s\", got \"%s\".",
+		a_ExpectedType,
+		AString(a_NBT.GetData(TagID), (size_t)a_NBT.GetDataLength(TagID)).c_str()
+	);
+	return false;
+}
+
+
+
+
+
+cBlockEntity * cWSSAnvil::LoadBeaconFromNBT(const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ)
+{
+	// Check if the data has a proper type:
+	if (!CheckBlockEntityType(a_NBT, a_TagIdx, "Beacon"))
+	{
+		return NULL;
+	}
+
+	std::auto_ptr<cBeaconEntity> Beacon(new cBeaconEntity(a_BlockX, a_BlockY, a_BlockZ, m_World));
 
 	int CurrentLine = a_NBT.FindChildByName(a_TagIdx, "Levels");
 	if (CurrentLine >= 0)
@@ -790,88 +834,128 @@ void cWSSAnvil::LoadBeaconFromNBT(cBlockEntityList & a_BlockEntities, const cPar
 		LoadItemGridFromNBT(Beacon->GetContents(), a_NBT, Items);
 	}
 
-	a_BlockEntities.push_back(Beacon.release());
+	return Beacon.release();
 }
 
 
 
 
 
-void cWSSAnvil::LoadChestFromNBT(cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx, BLOCKTYPE a_ChestType)
+cBlockEntity * cWSSAnvil::LoadChestFromNBT(const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_ChestBlockType)
 {
-	ASSERT(a_NBT.GetType(a_TagIdx) == TAG_Compound);
-	int x, y, z;
-	if (!GetBlockEntityNBTPos(a_NBT, a_TagIdx, x, y, z))
+	// Check if the data has a proper type:
+	// TODO: Does vanilla use "TrappedChest" or not? MCWiki says no, but previous code says yes
+	// Ref.: http://minecraft.gamepedia.com/Trapped_Chest
+	//       https://github.com/mc-server/MCServer/blob/d0551e2e0a98a28f31a88d489d17b408e4a7d38d/src/WorldStorage/WSSAnvil.cpp#L637
+	if (!CheckBlockEntityType(a_NBT, a_TagIdx, "Chest") && !CheckBlockEntityType(a_NBT, a_TagIdx, "TrappedChest"))
 	{
-		return;
+		return NULL;
 	}
+
 	int Items = a_NBT.FindChildByName(a_TagIdx, "Items");
 	if ((Items < 0) || (a_NBT.GetType(Items) != TAG_List))
 	{
-		return;  // Make it an empty chest - the chunk loader will provide an empty cChestEntity for this
+		return NULL;  // Make it an empty chest - the chunk loader will provide an empty cChestEntity for this
 	}
-	std::auto_ptr<cChestEntity> Chest(new cChestEntity(x, y, z, m_World, a_ChestType));
+	std::auto_ptr<cChestEntity> Chest(new cChestEntity(a_BlockX, a_BlockY, a_BlockZ, m_World, a_ChestBlockType));
 	LoadItemGridFromNBT(Chest->GetContents(), a_NBT, Items);
-	a_BlockEntities.push_back(Chest.release());
+	return Chest.release();
 }
 
 
 
 
 
-void cWSSAnvil::LoadDispenserFromNBT(cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx)
+cBlockEntity * cWSSAnvil::LoadCommandBlockFromNBT(const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ)
 {
-	ASSERT(a_NBT.GetType(a_TagIdx) == TAG_Compound);
-	int x, y, z;
-	if (!GetBlockEntityNBTPos(a_NBT, a_TagIdx, x, y, z))
+	// Check if the data has a proper type:
+	if (!CheckBlockEntityType(a_NBT, a_TagIdx, "Control"))
 	{
-		return;
+		return NULL;
+	}
+
+	std::auto_ptr<cCommandBlockEntity> CmdBlock(new cCommandBlockEntity(a_BlockX, a_BlockY, a_BlockZ, m_World));
+
+	int currentLine = a_NBT.FindChildByName(a_TagIdx, "Command");
+	if (currentLine >= 0)
+	{
+		CmdBlock->SetCommand(a_NBT.GetString(currentLine));
+	}
+
+	currentLine = a_NBT.FindChildByName(a_TagIdx, "SuccessCount");
+	if (currentLine >= 0)
+	{
+		CmdBlock->SetResult(a_NBT.GetInt(currentLine));
+	}
+
+	currentLine = a_NBT.FindChildByName(a_TagIdx, "LastOutput");
+	if (currentLine >= 0)
+	{
+		CmdBlock->SetLastOutput(a_NBT.GetString(currentLine));
+	}
+
+	// TODO 2014-01-18 xdot: Figure out what TrackOutput is and parse it.
+
+	return CmdBlock.release();
+}
+
+
+
+
+
+cBlockEntity * cWSSAnvil::LoadDispenserFromNBT(const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ)
+{
+	// Check if the data has a proper type:
+	if (!CheckBlockEntityType(a_NBT, a_TagIdx, "Trap"))
+	{
+		return NULL;
 	}
+
 	int Items = a_NBT.FindChildByName(a_TagIdx, "Items");
 	if ((Items < 0) || (a_NBT.GetType(Items) != TAG_List))
 	{
-		return;  // Make it an empty dispenser - the chunk loader will provide an empty cDispenserEntity for this
+		return NULL;  // Make it an empty dispenser - the chunk loader will provide an empty cDispenserEntity for this
 	}
-	std::auto_ptr<cDispenserEntity> Dispenser(new cDispenserEntity(x, y, z, m_World));
+	std::auto_ptr<cDispenserEntity> Dispenser(new cDispenserEntity(a_BlockX, a_BlockY, a_BlockZ, m_World));
 	LoadItemGridFromNBT(Dispenser->GetContents(), a_NBT, Items);
-	a_BlockEntities.push_back(Dispenser.release());
+	return Dispenser.release();
 }
 
 
 
 
 
-void cWSSAnvil::LoadDropperFromNBT(cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx)
+cBlockEntity * cWSSAnvil::LoadDropperFromNBT(const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ)
 {
-	ASSERT(a_NBT.GetType(a_TagIdx) == TAG_Compound);
-	int x, y, z;
-	if (!GetBlockEntityNBTPos(a_NBT, a_TagIdx, x, y, z))
+	// Check if the data has a proper type:
+	if (!CheckBlockEntityType(a_NBT, a_TagIdx, "Dropper"))
 	{
-		return;
+		return NULL;
 	}
+
 	int Items = a_NBT.FindChildByName(a_TagIdx, "Items");
 	if ((Items < 0) || (a_NBT.GetType(Items) != TAG_List))
 	{
-		return;  // Make it an empty dropper - the chunk loader will provide an empty cDropperEntity for this
+		return NULL;  // Make it an empty dropper - the chunk loader will provide an empty cDropperEntity for this
 	}
-	std::auto_ptr<cDropperEntity> Dropper(new cDropperEntity(x, y, z, m_World));
+	std::auto_ptr<cDropperEntity> Dropper(new cDropperEntity(a_BlockX, a_BlockY, a_BlockZ, m_World));
 	LoadItemGridFromNBT(Dropper->GetContents(), a_NBT, Items);
-	a_BlockEntities.push_back(Dropper.release());
+	return Dropper.release();
 }
 
 
 
 
 
-void cWSSAnvil::LoadFlowerPotFromNBT(cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx)
+cBlockEntity * cWSSAnvil::LoadFlowerPotFromNBT(const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ)
 {
-	ASSERT(a_NBT.GetType(a_TagIdx) == TAG_Compound);
-	int x, y, z;
-	if (!GetBlockEntityNBTPos(a_NBT, a_TagIdx, x, y, z))
+	// Check if the data has a proper type:
+	if (!CheckBlockEntityType(a_NBT, a_TagIdx, "FlowerPot"))
 	{
-		return;
+		return NULL;
 	}
-	std::auto_ptr<cFlowerPotEntity> FlowerPot(new cFlowerPotEntity(x, y, z, m_World));
+
+	std::auto_ptr<cFlowerPotEntity> FlowerPot(new cFlowerPotEntity(a_BlockX, a_BlockY, a_BlockZ, m_World));
 	short ItemType = 0, ItemData = 0;
 
 	int currentLine = a_NBT.FindChildByName(a_TagIdx, "Item");
@@ -887,37 +971,28 @@ void cWSSAnvil::LoadFlowerPotFromNBT(cBlockEntityList & a_BlockEntities, const c
 	}
 
 	FlowerPot->SetItem(cItem(ItemType, 1, ItemData));
-	a_BlockEntities.push_back(FlowerPot.release());
+	return FlowerPot.release();
 }
 
 
 
 
 
-void cWSSAnvil::LoadFurnaceFromNBT(cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx, BLOCKTYPE * a_BlockTypes, NIBBLETYPE * a_BlockMetas)
+cBlockEntity * cWSSAnvil::LoadFurnaceFromNBT(const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta)
 {
-	ASSERT(a_NBT.GetType(a_TagIdx) == TAG_Compound);
-	int x, y, z;
-	if (!GetBlockEntityNBTPos(a_NBT, a_TagIdx, x, y, z))
+	// Check if the data has a proper type:
+	if (!CheckBlockEntityType(a_NBT, a_TagIdx, "Furnace"))
 	{
-		return;
+		return NULL;
 	}
+
 	int Items = a_NBT.FindChildByName(a_TagIdx, "Items");
 	if ((Items < 0) || (a_NBT.GetType(Items) != TAG_List))
 	{
-		return;  // Make it an empty furnace - the chunk loader will provide an empty cFurnaceEntity for this
+		return NULL;  // Make it an empty furnace - the chunk loader will provide an empty cFurnaceEntity for this
 	}
 	
-	// Convert coords to relative:
-	int RelX = x;
-	int RelZ = z;
-	int ChunkX, ChunkZ;
-	cChunkDef::AbsoluteToRelative(RelX, y, RelZ, ChunkX, ChunkZ);
-	
-	// Create the furnace entity, with proper BlockType and BlockMeta info:
-	BLOCKTYPE  BlockType = cChunkDef::GetBlock(a_BlockTypes, RelX, y, RelZ);
-	NIBBLETYPE BlockMeta = cChunkDef::GetNibble(a_BlockMetas, RelX, y, RelZ);
-	std::auto_ptr<cFurnaceEntity> Furnace(new cFurnaceEntity(x, y, z, BlockType, BlockMeta, m_World));
+	std::auto_ptr<cFurnaceEntity> Furnace(new cFurnaceEntity(a_BlockX, a_BlockY, a_BlockZ, a_BlockType, a_BlockMeta, m_World));
 	
 	// Load slots:
 	for (int Child = a_NBT.GetFirstChild(Items); Child != -1; Child = a_NBT.GetNextSibling(Child))
@@ -954,184 +1029,147 @@ void cWSSAnvil::LoadFurnaceFromNBT(cBlockEntityList & a_BlockEntities, const cPa
 	
 	// Restart cooking:
 	Furnace->ContinueCooking();
-	a_BlockEntities.push_back(Furnace.release());
+	return Furnace.release();
 }
 
 
 
 
 
-void cWSSAnvil::LoadHopperFromNBT(cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx)
+cBlockEntity * cWSSAnvil::LoadHopperFromNBT(const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ)
 {
-	ASSERT(a_NBT.GetType(a_TagIdx) == TAG_Compound);
-	int x, y, z;
-	if (!GetBlockEntityNBTPos(a_NBT, a_TagIdx, x, y, z))
+	// Check if the data has a proper type:
+	if (!CheckBlockEntityType(a_NBT, a_TagIdx, "Hopper"))
 	{
-		return;
+		return NULL;
 	}
+
 	int Items = a_NBT.FindChildByName(a_TagIdx, "Items");
 	if ((Items < 0) || (a_NBT.GetType(Items) != TAG_List))
 	{
-		return;  // Make it an empty hopper - the chunk loader will provide an empty cHopperEntity for this
+		return NULL;  // Make it an empty hopper - the chunk loader will provide an empty cHopperEntity for this
 	}
-	std::auto_ptr<cHopperEntity> Hopper(new cHopperEntity(x, y, z, m_World));
+	std::auto_ptr<cHopperEntity> Hopper(new cHopperEntity(a_BlockX, a_BlockY, a_BlockZ, m_World));
 	LoadItemGridFromNBT(Hopper->GetContents(), a_NBT, Items);
-	a_BlockEntities.push_back(Hopper.release());
+	return Hopper.release();
 }
 
 
 
 
 
-void cWSSAnvil::LoadJukeboxFromNBT(cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx)
+cBlockEntity * cWSSAnvil::LoadJukeboxFromNBT(const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ)
 {
-	ASSERT(a_NBT.GetType(a_TagIdx) == TAG_Compound);
-	int x, y, z;
-	if (!GetBlockEntityNBTPos(a_NBT, a_TagIdx, x, y, z))
+	// Check if the data has a proper type:
+	if (!CheckBlockEntityType(a_NBT, a_TagIdx, "RecordPlayer"))
 	{
-		return;
+		return NULL;
 	}
-	std::auto_ptr<cJukeboxEntity> Jukebox(new cJukeboxEntity(x, y, z, m_World));
+
+	std::auto_ptr<cJukeboxEntity> Jukebox(new cJukeboxEntity(a_BlockX, a_BlockY, a_BlockZ, m_World));
 	int Record = a_NBT.FindChildByName(a_TagIdx, "Record");
 	if (Record >= 0)
 	{
 		Jukebox->SetRecord(a_NBT.GetInt(Record));
 	}
-	a_BlockEntities.push_back(Jukebox.release());
-}
-
-
-
-
-
-void cWSSAnvil::LoadNoteFromNBT(cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx)
-{
-	ASSERT(a_NBT.GetType(a_TagIdx) == TAG_Compound);
-	int x, y, z;
-	if (!GetBlockEntityNBTPos(a_NBT, a_TagIdx, x, y, z))
-	{
-		return;
-	}
-	std::auto_ptr<cNoteEntity> Note(new cNoteEntity(x, y, z, m_World));
-	int note = a_NBT.FindChildByName(a_TagIdx, "note");
-	if (note >= 0)
-	{
-		Note->SetPitch(a_NBT.GetByte(note));
-	}
-	a_BlockEntities.push_back(Note.release());
+	return Jukebox.release();
 }
 
 
 
 
 
-void cWSSAnvil::LoadSignFromNBT(cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx)
+cBlockEntity * cWSSAnvil::LoadMobHeadFromNBT(const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ)
 {
-	ASSERT(a_NBT.GetType(a_TagIdx) == TAG_Compound);
-	int x, y, z;
-	if (!GetBlockEntityNBTPos(a_NBT, a_TagIdx, x, y, z))
+	// Check if the data has a proper type:
+	if (!CheckBlockEntityType(a_NBT, a_TagIdx, "Skull"))
 	{
-		return;
+		return NULL;
 	}
-	std::auto_ptr<cSignEntity> Sign(new cSignEntity(E_BLOCK_SIGN_POST, x, y, z, m_World));
 
-	int currentLine = a_NBT.FindChildByName(a_TagIdx, "Text1");
-	if (currentLine >= 0)
-	{
-		Sign->SetLine(0, a_NBT.GetString(currentLine));
-	}
+	std::auto_ptr<cMobHeadEntity> MobHead(new cMobHeadEntity(a_BlockX, a_BlockY, a_BlockZ, m_World));
 
-	currentLine = a_NBT.FindChildByName(a_TagIdx, "Text2");
+	int currentLine = a_NBT.FindChildByName(a_TagIdx, "SkullType");
 	if (currentLine >= 0)
 	{
-		Sign->SetLine(1, a_NBT.GetString(currentLine));
+		MobHead->SetType(static_cast<eMobHeadType>(a_NBT.GetByte(currentLine)));
 	}
 
-	currentLine = a_NBT.FindChildByName(a_TagIdx, "Text3");
+	currentLine = a_NBT.FindChildByName(a_TagIdx, "Rot");
 	if (currentLine >= 0)
 	{
-		Sign->SetLine(2, a_NBT.GetString(currentLine));
+		MobHead->SetRotation(static_cast<eMobHeadRotation>(a_NBT.GetByte(currentLine)));
 	}
 
-	currentLine = a_NBT.FindChildByName(a_TagIdx, "Text4");
+	currentLine = a_NBT.FindChildByName(a_TagIdx, "ExtraType");
 	if (currentLine >= 0)
 	{
-		Sign->SetLine(3, a_NBT.GetString(currentLine));
+		MobHead->SetOwner(a_NBT.GetString(currentLine));
 	}
 
-	a_BlockEntities.push_back(Sign.release());
+	return MobHead.release();
 }
 
 
 
 
 
-void cWSSAnvil::LoadMobHeadFromNBT(cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx)
+cBlockEntity * cWSSAnvil::LoadNoteBlockFromNBT(const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ)
 {
-	ASSERT(a_NBT.GetType(a_TagIdx) == TAG_Compound);
-	int x, y, z;
-	if (!GetBlockEntityNBTPos(a_NBT, a_TagIdx, x, y, z))
-	{
-		return;
-	}
-	std::auto_ptr<cMobHeadEntity> MobHead(new cMobHeadEntity(x, y, z, m_World));
-
-	int currentLine = a_NBT.FindChildByName(a_TagIdx, "SkullType");
-	if (currentLine >= 0)
+	// Check if the data has a proper type:
+	if (!CheckBlockEntityType(a_NBT, a_TagIdx, "Music"))
 	{
-		MobHead->SetType(static_cast<eMobHeadType>(a_NBT.GetByte(currentLine)));
+		return NULL;
 	}
 
-	currentLine = a_NBT.FindChildByName(a_TagIdx, "Rot");
-	if (currentLine >= 0)
+	std::auto_ptr<cNoteEntity> NoteBlock(new cNoteEntity(a_BlockX, a_BlockY, a_BlockZ, m_World));
+	int note = a_NBT.FindChildByName(a_TagIdx, "note");
+	if (note >= 0)
 	{
-		MobHead->SetRotation(static_cast<eMobHeadRotation>(a_NBT.GetByte(currentLine)));
+		NoteBlock->SetPitch(a_NBT.GetByte(note));
 	}
-
-	currentLine = a_NBT.FindChildByName(a_TagIdx, "ExtraType");
-	if (currentLine >= 0)
-	{
-		MobHead->SetOwner(a_NBT.GetString(currentLine));
-	}
-
-	a_BlockEntities.push_back(MobHead.release());
+	return NoteBlock.release();
 }
 
 
 
 
 
-void cWSSAnvil::LoadCommandBlockFromNBT(cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx)
+cBlockEntity * cWSSAnvil::LoadSignFromNBT(const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType)
 {
-	ASSERT(a_NBT.GetType(a_TagIdx) == TAG_Compound);
-	int x, y, z;
-	if (!GetBlockEntityNBTPos(a_NBT, a_TagIdx, x, y, z))
+	// Check if the data has a proper type:
+	if (!CheckBlockEntityType(a_NBT, a_TagIdx, "Sign"))
 	{
-		return;
+		return NULL;
 	}
-	std::auto_ptr<cCommandBlockEntity> CmdBlock(new cCommandBlockEntity(x, y, z, m_World));
 
-	int currentLine = a_NBT.FindChildByName(a_TagIdx, "Command");
+	std::auto_ptr<cSignEntity> Sign(new cSignEntity(a_BlockType, a_BlockX, a_BlockY, a_BlockZ, m_World));
+
+	int currentLine = a_NBT.FindChildByName(a_TagIdx, "Text1");
 	if (currentLine >= 0)
 	{
-		CmdBlock->SetCommand(a_NBT.GetString(currentLine));
+		Sign->SetLine(0, a_NBT.GetString(currentLine));
 	}
 
-	currentLine = a_NBT.FindChildByName(a_TagIdx, "SuccessCount");
+	currentLine = a_NBT.FindChildByName(a_TagIdx, "Text2");
 	if (currentLine >= 0)
 	{
-		CmdBlock->SetResult(a_NBT.GetInt(currentLine));
+		Sign->SetLine(1, a_NBT.GetString(currentLine));
 	}
 
-	currentLine = a_NBT.FindChildByName(a_TagIdx, "LastOutput");
+	currentLine = a_NBT.FindChildByName(a_TagIdx, "Text3");
 	if (currentLine >= 0)
 	{
-		CmdBlock->SetLastOutput(a_NBT.GetString(currentLine));
+		Sign->SetLine(2, a_NBT.GetString(currentLine));
 	}
 
-	// TODO 2014-01-18 xdot: Figure out what TrackOutput is and parse it.
+	currentLine = a_NBT.FindChildByName(a_TagIdx, "Text4");
+	if (currentLine >= 0)
+	{
+		Sign->SetLine(3, a_NBT.GetString(currentLine));
+	}
 
-	a_BlockEntities.push_back(CmdBlock.release());
+	return Sign.release();
 }
 
 
diff --git a/src/WorldStorage/WSSAnvil.h b/src/WorldStorage/WSSAnvil.h
index a41268f4c..591ec6757 100644
--- a/src/WorldStorage/WSSAnvil.h
+++ b/src/WorldStorage/WSSAnvil.h
@@ -125,6 +125,10 @@ protected:
 	/// Loads the chunk's BlockEntities from NBT data (a_Tag is the Level\\TileEntities list tag; may be -1)
 	void LoadBlockEntitiesFromNBT(cBlockEntityList & a_BlockEntitites, const cParsedNBT & a_NBT, int a_Tag, BLOCKTYPE * a_BlockTypes, NIBBLETYPE * a_BlockMetas);
 	
+	/** Loads the data for a block entity from the specified NBT tag.
+	Returns the loaded block entity, or NULL upon failure. */
+	cBlockEntity * LoadBlockEntityFromNBT(const cParsedNBT & a_NBT, int a_Tag, int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta);
+
 	/// Loads a cItem contents from the specified NBT tag; returns true if successful. Doesn't load the Slot tag
 	bool LoadItemFromNBT(cItem & a_Item, const cParsedNBT & a_NBT, int a_TagIdx);
 	
@@ -134,18 +138,21 @@ protected:
 	*/
 	void LoadItemGridFromNBT(cItemGrid & a_ItemGrid, const cParsedNBT & a_NBT, int a_ItemsTagIdx, int s_SlotOffset = 0);
 	
-	void LoadBeaconFromNBT      (cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx);
-	void LoadChestFromNBT       (cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx, BLOCKTYPE a_ChestType);
-	void LoadDispenserFromNBT   (cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx);
-	void LoadDropperFromNBT     (cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx);
-	void LoadFlowerPotFromNBT   (cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx);
-	void LoadFurnaceFromNBT     (cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx, BLOCKTYPE * a_BlockTypes, NIBBLETYPE * a_BlockMetas);
-	void LoadHopperFromNBT      (cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx);
-	void LoadJukeboxFromNBT     (cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx);
-	void LoadNoteFromNBT        (cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx);
-	void LoadSignFromNBT        (cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx);
-	void LoadMobHeadFromNBT     (cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx);
-	void LoadCommandBlockFromNBT(cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx);
+	/** Returns true iff the "id" child tag inside the specified tag equals the specified expected type. */
+	bool CheckBlockEntityType(const cParsedNBT & a_NBT, int a_TagIdx, const char * a_ExpectedType);
+
+	cBlockEntity * LoadBeaconFromNBT      (const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ);
+	cBlockEntity * LoadChestFromNBT       (const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_ChestBlockType);
+	cBlockEntity * LoadCommandBlockFromNBT(const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ);
+	cBlockEntity * LoadDispenserFromNBT   (const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ);
+	cBlockEntity * LoadDropperFromNBT     (const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ);
+	cBlockEntity * LoadFlowerPotFromNBT   (const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ);
+	cBlockEntity * LoadFurnaceFromNBT     (const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta);
+	cBlockEntity * LoadHopperFromNBT      (const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ);
+	cBlockEntity * LoadJukeboxFromNBT     (const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ);
+	cBlockEntity * LoadMobHeadFromNBT     (const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ);
+	cBlockEntity * LoadNoteBlockFromNBT   (const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ);
+	cBlockEntity * LoadSignFromNBT        (const cParsedNBT & a_NBT, int a_TagIdx, int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_SignBlockType);
 	
 	void LoadEntityFromNBT(cEntityList & a_Entities, const cParsedNBT & a_NBT, int a_EntityTagIdx, const char * a_IDTag, size_t a_IDTagLength);