24 files changed, 1072 insertions, 449 deletions

diff --git a/src/BiomeDef.h b/src/BiomeDef.h
index 67916890d..f929596e9 100644
--- a/src/BiomeDef.h
+++ b/src/BiomeDef.h
@@ -10,7 +10,7 @@
 #pragma once
 
 
-
+#include "StringUtils.h"
 
 
 // tolua_begin
diff --git a/src/BlockArea.cpp b/src/BlockArea.cpp
index aff0bf9c6..40fdd68c0 100644
--- a/src/BlockArea.cpp
+++ b/src/BlockArea.cpp
@@ -9,7 +9,7 @@
 #include "OSSupport/GZipFile.h"
 #include "Blocks/BlockHandler.h"
 #include "Cuboid.h"
-
+#include "ChunkData.h"
 
 
 
@@ -1835,116 +1835,88 @@ bool cBlockArea::cChunkReader::Coords(int a_ChunkX, int a_ChunkZ)
 
 
 
-void cBlockArea::cChunkReader::BlockTypes(const BLOCKTYPE * a_BlockTypes)
+void cBlockArea::cChunkReader::ChunkData(const cChunkData &  a_BlockBuffer)
 {
-	if (m_Area.m_BlockTypes == NULL)
 	{
-		// Don't want BlockTypes
-		return;
-	}
-	
-	int SizeY = m_Area.m_Size.y;
-	int MinY = m_Origin.y;
-	
-	// SizeX, SizeZ are the dmensions of the block data to copy from the current chunk (size of the geometric union)
-	// OffX, OffZ are the offsets of the current chunk data from the area origin
-	// BaseX, BaseZ are the offsets of the area data within the current chunk from the chunk borders
-	int SizeX = cChunkDef::Width;
-	int SizeZ = cChunkDef::Width;
-	int OffX, OffZ;
-	int BaseX, BaseZ;
-	OffX = m_CurrentChunkX * cChunkDef::Width - m_Origin.x;
-	if (OffX < 0)
-	{
-		BaseX = -OffX;
-		SizeX += OffX;  // SizeX is decreased, OffX is negative
-		OffX = 0;
-	}
-	else
-	{
-		BaseX = 0;
-	}
-	OffZ = m_CurrentChunkZ * cChunkDef::Width - m_Origin.z;
-	if (OffZ < 0)
-	{
-		BaseZ = -OffZ;
-		SizeZ += OffZ;  // SizeZ is decreased, OffZ is negative
-		OffZ = 0;
-	}
-	else
-	{
-		BaseZ = 0;
-	}
-	// If the chunk extends beyond the area in the X or Z axis, cut off the Size:
-	if ((m_CurrentChunkX + 1) * cChunkDef::Width > m_Origin.x + m_Area.m_Size.x)
-	{
-		SizeX -= (m_CurrentChunkX + 1) * cChunkDef::Width - (m_Origin.x + m_Area.m_Size.x);
-	}
-	if ((m_CurrentChunkZ + 1) * cChunkDef::Width > m_Origin.z + m_Area.m_Size.z)
-	{
-		SizeZ -= (m_CurrentChunkZ + 1) * cChunkDef::Width - (m_Origin.z + m_Area.m_Size.z);
-	}
-
-	for (int y = 0; y < SizeY; y++)
-	{
-		int ChunkY = MinY + y;
-		int AreaY = y;
-		for (int z = 0; z < SizeZ; z++)
+		if (m_Area.m_BlockTypes != NULL)
 		{
-			int ChunkZ = BaseZ + z;
-			int AreaZ = OffZ + z;
-			for (int x = 0; x < SizeX; x++)
+			int SizeY = m_Area.m_Size.y;
+			int MinY = m_Origin.y;
+	
+			// SizeX, SizeZ are the dimensions of the block data to copy from the current chunk (size of the geometric union)
+			// OffX, OffZ are the offsets of the current chunk data from the area origin
+			// BaseX, BaseZ are the offsets of the area data within the current chunk from the chunk borders
+			int SizeX = cChunkDef::Width;
+			int SizeZ = cChunkDef::Width;
+			int OffX, OffZ;
+			int BaseX, BaseZ;
+			OffX = m_CurrentChunkX * cChunkDef::Width - m_Origin.x;
+			if (OffX < 0)
 			{
-				int ChunkX = BaseX + x;
-				int AreaX = OffX + x;
-				m_Area.m_BlockTypes[m_Area.MakeIndex(AreaX, AreaY, AreaZ)] = cChunkDef::GetBlock(a_BlockTypes, ChunkX, ChunkY, ChunkZ);
-			}  // for x
-		}  // for z
-	}  // for y
-}
-
-
-
+				BaseX = -OffX;
+				SizeX += OffX;  // SizeX is decreased, OffX is negative
+				OffX = 0;
+			}
+			else
+			{
+				BaseX = 0;
+			}
+			OffZ = m_CurrentChunkZ * cChunkDef::Width - m_Origin.z;
+			if (OffZ < 0)
+			{
+				BaseZ = -OffZ;
+				SizeZ += OffZ;  // SizeZ is decreased, OffZ is negative
+				OffZ = 0;
+			}
+			else
+			{
+				BaseZ = 0;
+			}
+			// If the chunk extends beyond the area in the X or Z axis, cut off the Size:
+			if ((m_CurrentChunkX + 1) * cChunkDef::Width > m_Origin.x + m_Area.m_Size.x)
+			{
+				SizeX -= (m_CurrentChunkX + 1) * cChunkDef::Width - (m_Origin.x + m_Area.m_Size.x);
+			}
+			if ((m_CurrentChunkZ + 1) * cChunkDef::Width > m_Origin.z + m_Area.m_Size.z)
+			{
+				SizeZ -= (m_CurrentChunkZ + 1) * cChunkDef::Width - (m_Origin.z + m_Area.m_Size.z);
+			}
 
+			for (int y = 0; y < SizeY; y++)
+			{
+				int ChunkY = MinY + y;
+				int AreaY = y;
+				for (int z = 0; z < SizeZ; z++)
+				{
+					int ChunkZ = BaseZ + z;
+					int AreaZ = OffZ + z;
+					for (int x = 0; x < SizeX; x++)
+					{
+						int ChunkX = BaseX + x;
+						int AreaX = OffX + x;
+						m_Area.m_BlockTypes[m_Area.MakeIndex(AreaX, AreaY, AreaZ)] = a_BlockBuffer.GetBlock(ChunkX, ChunkY, ChunkZ);
+					}  // for x
+				}  // for z
+			}  // for y
+		}
+	}
 
-void cBlockArea::cChunkReader::BlockMeta(const NIBBLETYPE * a_BlockMetas)
-{
-	if (m_Area.m_BlockMetas == NULL)
+	if (m_Area.m_BlockMetas != NULL)
 	{
-		// Don't want metas
-		return;
+		a_BlockBuffer.CopyMetas(m_Area.m_BlockMetas);
 	}
-	CopyNibbles(m_Area.m_BlockMetas, a_BlockMetas);
-}
-
-
-
 
-
-void cBlockArea::cChunkReader::BlockLight(const NIBBLETYPE * a_BlockLight)
-{
-	if (m_Area.m_BlockLight == NULL)
+	if (m_Area.m_BlockLight != NULL)
 	{
-		// Don't want light
-		return;
+		a_BlockBuffer.CopyBlockLight(m_Area.m_BlockLight);
 	}
-	CopyNibbles(m_Area.m_BlockLight, a_BlockLight);
-}
-
-
 
-
-
-void cBlockArea::cChunkReader::BlockSkyLight(const NIBBLETYPE * a_BlockSkyLight)
-{
-	if (m_Area.m_BlockSkyLight == NULL)
+	if (m_Area.m_BlockSkyLight != NULL)
 	{
-		// Don't want skylight
-		return;
+		a_BlockBuffer.CopySkyLight(m_Area.m_BlockSkyLight);
 	}
-	CopyNibbles(m_Area.m_BlockSkyLight, a_BlockSkyLight);
-}
 
+}
 
 
 
diff --git a/src/BlockArea.h b/src/BlockArea.h
index 6dba0f12e..2bd26facd 100644
--- a/src/BlockArea.h
+++ b/src/BlockArea.h
@@ -14,6 +14,7 @@
 
 #include "ForEachChunkProvider.h"
 #include "Vector3.h"
+#include "ChunkDataCallback.h"
 
 
 
@@ -316,11 +317,8 @@ protected:
 		void CopyNibbles(NIBBLETYPE * a_AreaDst, const NIBBLETYPE * a_ChunkSrc);
 		
 		// cChunkDataCallback overrides:
-		virtual bool Coords       (int a_ChunkX, int a_ChunkZ) override;
-		virtual void BlockTypes   (const BLOCKTYPE *  a_BlockTypes)    override;
-		virtual void BlockMeta    (const NIBBLETYPE * a_BlockMetas)    override;
-		virtual void BlockLight   (const NIBBLETYPE * a_BlockLight)    override;
-		virtual void BlockSkyLight(const NIBBLETYPE * a_BlockSkyLight) override;
+		virtual bool Coords(int a_ChunkX, int a_ChunkZ) override;
+		virtual void ChunkData(const cChunkData &  a_BlockTypes) override;
 	} ;
 	
 	typedef NIBBLETYPE * NIBBLEARRAY;
diff --git a/src/Chunk.cpp b/src/Chunk.cpp
index ca536e89a..23412a4c3 100644
--- a/src/Chunk.cpp
+++ b/src/Chunk.cpp
@@ -238,26 +238,12 @@ void cChunk::MarkLoadFailed(void)
 
 void cChunk::GetAllData(cChunkDataCallback & a_Callback)
 {
-	a_Callback.HeightMap    (&m_HeightMap);
-	a_Callback.BiomeData    (&m_BiomeMap);
+	a_Callback.HeightMap(&m_HeightMap);
+	a_Callback.BiomeData(&m_BiomeMap);
 
-	COMPRESSED_BLOCKTYPE Blocks = m_BlockTypes;
-	Blocks.resize(NumBlocks);
-	a_Callback.BlockTypes   (&Blocks[0]);
+	a_Callback.LightIsValid(m_IsLightValid);
 
-	COMPRESSED_NIBBLETYPE Metas = m_BlockMeta;
-	Metas.resize(NumBlocks / 2);
-	a_Callback.BlockMeta    (&Metas[0]);
-
-	a_Callback.LightIsValid (m_IsLightValid);
-
-	COMPRESSED_NIBBLETYPE BlockLights = m_BlockLight;
-	BlockLights.resize(NumBlocks / 2);
-	a_Callback.BlockLight   (&BlockLights[0]);
-
-	COMPRESSED_NIBBLETYPE BlockSkyLights = m_BlockSkyLight;
-	BlockSkyLights.resize(NumBlocks / 2, 0xff);
-	a_Callback.BlockSkyLight(&BlockSkyLights[0]);
+	a_Callback.ChunkData(m_ChunkData);
 	
 	for (cEntityList::iterator itr = m_Entities.begin(); itr != m_Entities.end(); ++itr)
 	{
@@ -296,48 +282,10 @@ void cChunk::SetAllData(
 		CalculateHeightmap(a_BlockTypes);
 	}
 
-	int IdxWhereNonEmptyStarts = 0;
-	{ // Blocktype compression
-		unsigned char Highest = 0;
-		int X = 0, Z = 0;
-		m_BlockTypes.clear();
-			
-		for (int x = 0; x < Width; x++)
-		{
-			for (int z = 0; z < Width; z++)
-			{
-				unsigned char Height = m_HeightMap[x + z * Width];
-				if (Height > Highest)
-				{
-					Highest = Height;
-					X = x; Z = z;
-				}
-			}
-		}
-
-		IdxWhereNonEmptyStarts = MakeIndexNoCheck(X, Highest + 1, Z);
-
-		m_BlockTypes.insert(m_BlockTypes.end(), &a_BlockTypes[0], &a_BlockTypes[IdxWhereNonEmptyStarts]);
-	}
-
-	{ // Blockmeta compression
-		m_BlockMeta.clear();
-		m_BlockMeta.insert(m_BlockMeta.end(), &a_BlockMeta[0], &a_BlockMeta[IdxWhereNonEmptyStarts / 2]);
-	}
-	
-	if (a_BlockLight != NULL)
-	{
-		// Compress blocklight
-		m_BlockLight.clear();
-		m_BlockLight.insert(m_BlockLight.end(), &a_BlockLight[0], &a_BlockLight[IdxWhereNonEmptyStarts / 2]);
-	}
-
-	if (a_BlockSkyLight != NULL)
-	{
-		 // Compress skylight
-		m_BlockSkyLight.clear();
-		m_BlockSkyLight.insert(m_BlockSkyLight.end(), &a_BlockSkyLight[0], &a_BlockSkyLight[IdxWhereNonEmptyStarts / 2]);
-	}
+	m_ChunkData.SetBlockTypes(a_BlockTypes);
+	m_ChunkData.SetMetas(a_BlockMeta);
+	m_ChunkData.SetBlockLight(a_BlockLight);
+	m_ChunkData.SetSkyLight(a_BlockSkyLight);
 	
 	m_IsLightValid = (a_BlockLight != NULL) && (a_BlockSkyLight != NULL);
 
@@ -378,15 +326,9 @@ void cChunk::SetLight(
 	// TODO: We might get cases of wrong lighting when a chunk changes in the middle of a lighting calculation.
 	// Postponing until we see how bad it is :)
 
-	{ // Compress blocklight
-		m_BlockLight.clear();
-		m_BlockLight.insert(m_BlockLight.end(), &a_BlockLight[0], &a_BlockLight[m_BlockTypes.size() / 2]);
-	}
+	m_ChunkData.SetBlockLight(a_BlockLight);
 
-	{ // Compress skylight
-		m_BlockSkyLight.clear();
-		m_BlockSkyLight.insert(m_BlockSkyLight.end(), &a_SkyLight[0], &a_SkyLight[m_BlockTypes.size() / 2]);
-	}
+	m_ChunkData.SetSkyLight(a_SkyLight);
 
 	m_IsLightValid = true;
 }
@@ -397,8 +339,7 @@ void cChunk::SetLight(
 
 void cChunk::GetBlockTypes(BLOCKTYPE * a_BlockTypes)
 {
-	std::copy(m_BlockTypes.begin(), m_BlockTypes.end(), a_BlockTypes);
-	std::fill_n(&a_BlockTypes[m_BlockTypes.size()], NumBlocks - m_BlockTypes.size(), E_BLOCK_AIR);
+	m_ChunkData.CopyBlockTypes(a_BlockTypes);
 }
 
 
@@ -684,8 +625,7 @@ void cChunk::Tick(float a_Dt)
 
 void cChunk::TickBlock(int a_RelX, int a_RelY, int a_RelZ)
 {
-	unsigned Index = MakeIndex(a_RelX, a_RelY, a_RelZ);
-	cBlockHandler * Handler = BlockHandler(GetBlock(Index));
+	cBlockHandler * Handler = BlockHandler(GetBlock(a_RelX, a_RelY, a_RelZ));
 	ASSERT(Handler != NULL);  // Happenned on server restart, FS #243
 	cChunkInterface ChunkInterface(this->GetWorld()->GetChunkMap());
 	cBlockInServerPluginInterface PluginInterface(*this->GetWorld());
@@ -810,19 +750,18 @@ void cChunk::CheckBlocks()
 	{
 		return;
 	}
-	std::vector<unsigned int> ToTickBlocks;
+	std::vector<Vector3i> ToTickBlocks;
 	std::swap(m_ToTickBlocks, ToTickBlocks);
 	
 	cChunkInterface ChunkInterface(m_World->GetChunkMap());
 	cBlockInServerPluginInterface PluginInterface(*m_World);
 	
-	for (std::vector<unsigned int>::const_iterator itr = ToTickBlocks.begin(), end = ToTickBlocks.end(); itr != end; ++itr)
+	for (std::vector<Vector3i>::const_iterator itr = ToTickBlocks.begin(), end = ToTickBlocks.end(); itr != end; ++itr)
 	{
-		unsigned int index = (*itr);
-		Vector3i BlockPos = IndexToCoordinate(index);
+		Vector3i Pos = (*itr);
 
-		cBlockHandler * Handler = BlockHandler(GetBlock(index));
-		Handler->Check(ChunkInterface, PluginInterface, BlockPos.x, BlockPos.y, BlockPos.z, *this);
+		cBlockHandler * Handler = BlockHandler(GetBlock(Pos));
+		Handler->Check(ChunkInterface, PluginInterface, Pos.x, Pos.y, Pos.z, *this);
 	}  // for itr - ToTickBlocks[]
 }
 
@@ -865,8 +804,7 @@ void cChunk::TickBlocks(void)
 			continue; // It's all air up here
 		}
 
-		unsigned int Index = MakeIndexNoCheck(m_BlockTickX, m_BlockTickY, m_BlockTickZ);
-		cBlockHandler * Handler = BlockHandler(GetBlock(Index));
+		cBlockHandler * Handler = BlockHandler(GetBlock(m_BlockTickX, m_BlockTickY, m_BlockTickZ));
 		ASSERT(Handler != NULL);  // Happenned on server restart, FS #243
 		Handler->OnUpdate(ChunkInterface, *this->GetWorld(), PluginInterface, *this, m_BlockTickX, m_BlockTickY, m_BlockTickZ);
 	}  // for i - tickblocks
@@ -1258,9 +1196,8 @@ bool cChunk::UnboundedRelGetBlockLights(int a_RelX, int a_RelY, int a_RelZ, NIBB
 		// The chunk is not available, bail out
 		return false;
 	}
-	int idx = Chunk->MakeIndex(a_RelX, a_RelY, a_RelZ);
-	a_BlockLight = Chunk->GetBlockLight(idx);
-	a_SkyLight = Chunk->GetSkyLight(idx);
+	a_BlockLight = Chunk->GetBlockLight(a_RelX, a_RelY, a_RelZ);
+	a_SkyLight = Chunk->GetSkyLight(a_RelX, a_RelY, a_RelZ);
 	return true;
 }
 
@@ -1465,11 +1402,9 @@ void cChunk::CalculateHeightmap(const BLOCKTYPE * a_BlockTypes)
 void cChunk::SetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta)
 {
 	FastSetBlock(a_RelX, a_RelY, a_RelZ, a_BlockType, a_BlockMeta);
-
-	const int index = MakeIndexNoCheck(a_RelX, a_RelY, a_RelZ);
 	
 	// Tick this block and its neighbors:
-	m_ToTickBlocks.push_back(index);
+	m_ToTickBlocks.push_back(Vector3i(a_RelX, a_RelY, a_RelZ));
 	QueueTickBlockNeighbors(a_RelX, a_RelY, a_RelZ);
 
 	// If there was a block entity, remove it:
@@ -1533,7 +1468,7 @@ void cChunk::QueueTickBlock(int a_RelX, int a_RelY, int a_RelZ)
 		return;
 	}
 	
-	m_ToTickBlocks.push_back(MakeIndexNoCheck(a_RelX, a_RelY, a_RelZ));
+	m_ToTickBlocks.push_back(Vector3i(a_RelX, a_RelY, a_RelZ));
 }
 
 
@@ -1571,9 +1506,8 @@ void cChunk::FastSetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockT
 
 	ASSERT(IsValid());
 	
-	const int index = MakeIndexNoCheck(a_RelX, a_RelY, a_RelZ);
-	const BLOCKTYPE OldBlockType = GetBlock(index);
-	const BLOCKTYPE OldBlockMeta = GetNibble(m_BlockMeta, index);
+	const BLOCKTYPE OldBlockType = GetBlock(a_RelX, a_RelY, a_RelZ);
+	const BLOCKTYPE OldBlockMeta = m_ChunkData.GetMeta(a_RelX, a_RelY, a_RelZ);
 	if ((OldBlockType == a_BlockType) && (OldBlockMeta == a_BlockMeta))
 	{
 		return;
@@ -1581,11 +1515,7 @@ void cChunk::FastSetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockT
 
 	MarkDirty();
 
-	if ((size_t)index >= m_BlockTypes.size())
-	{
-		m_BlockTypes.resize(index + 1);
-	}
-	m_BlockTypes[index] = a_BlockType;
+	m_ChunkData.SetBlock(a_RelX, a_RelY, a_RelZ, a_BlockType);
 
 	// The client doesn't need to distinguish between stationary and nonstationary fluids:
 	if (
@@ -1601,7 +1531,7 @@ void cChunk::FastSetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockT
 		m_PendingSendBlocks.push_back(sSetBlock(m_PosX, m_PosZ, a_RelX, a_RelY, a_RelZ, a_BlockType, a_BlockMeta));
 	}
 	
-	SetNibble(m_BlockMeta, index, a_BlockMeta);
+	m_ChunkData.SetMeta(a_RelX, a_RelY, a_RelZ, a_BlockMeta);
 
 	// ONLY recalculate lighting if it's necessary!
 	if (
@@ -1624,7 +1554,7 @@ void cChunk::FastSetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockT
 		{
 			for (int y = a_RelY - 1; y > 0; --y)
 			{
-				if (GetBlock(MakeIndexNoCheck(a_RelX, y, a_RelZ)) != E_BLOCK_AIR)
+				if (GetBlock(a_RelX, y, a_RelZ) != E_BLOCK_AIR)
 				{
 					m_HeightMap[a_RelX + a_RelZ * Width] = (unsigned char)y;
 					break;
@@ -1638,39 +1568,18 @@ void cChunk::FastSetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockT
 
 
 
-void cChunk::SetMeta(int a_BlockIdx, NIBBLETYPE a_Meta)
-{
-	if (GetNibble(m_BlockMeta, a_BlockIdx) == a_Meta)
-	{
-		return;
-	}
-
-	MarkDirty();
-	SetNibble(m_BlockMeta, a_BlockIdx, a_Meta);
-	Vector3i Coords(IndexToCoordinate(a_BlockIdx));
-
-	m_PendingSendBlocks.push_back(sSetBlock(m_PosX, m_PosZ, Coords.x, Coords.y, Coords.z, GetBlock(a_BlockIdx), a_Meta));
-}
-
-
-
-
-
 void cChunk::SendBlockTo(int a_RelX, int a_RelY, int a_RelZ, cClientHandle * a_Client)
 {
-	// The coords must be valid, because the upper level already does chunk lookup. No need to check them again.
-	// There's an debug-time assert in MakeIndexNoCheck anyway
-	unsigned int index = MakeIndexNoCheck(a_RelX, a_RelY, a_RelZ);
 
 	if (a_Client == NULL)
 	{
 		// Queue the block for all clients in the chunk (will be sent in Tick())
-		m_PendingSendBlocks.push_back(sSetBlock(m_PosX, m_PosZ, a_RelX, a_RelY, a_RelZ, GetBlock(index), GetMeta(index)));
+		m_PendingSendBlocks.push_back(sSetBlock(m_PosX, m_PosZ, a_RelX, a_RelY, a_RelZ, GetBlock(a_RelX, a_RelY, a_RelZ), GetMeta(a_RelX, a_RelY, a_RelZ)));
 		return;
 	}
 
 	Vector3i wp = PositionToWorldPosition(a_RelX, a_RelY, a_RelZ);
-	a_Client->SendBlockChange(wp.x, wp.y, wp.z, GetBlock(index), GetMeta(index));
+	a_Client->SendBlockChange(wp.x, wp.y, wp.z, GetBlock(a_RelX, a_RelY, a_RelZ), GetMeta(a_RelX, a_RelY, a_RelZ));
 	
 	// FS #268 - if a BlockEntity digging is cancelled by a plugin, the entire block entity must be re-sent to the client:
 	for (cBlockEntityList::iterator itr = m_BlockEntities.begin(), end = m_BlockEntities.end(); itr != end; ++itr)
@@ -2529,27 +2438,7 @@ BLOCKTYPE cChunk::GetBlock(int a_RelX, int a_RelY, int a_RelZ) const
 		return 0; // Clip
 	}
 
-	return GetBlock(MakeIndexNoCheck(a_RelX, a_RelY, a_RelZ));
-}
-
-
-
-
-
-BLOCKTYPE cChunk::GetBlock(int a_BlockIdx) const
-{
-	if ((a_BlockIdx < 0) || (a_BlockIdx >= NumBlocks))
-	{
-		ASSERT(!"GetBlock(idx) out of bounds!");
-		return 0;
-	}
-
-	if ((size_t)a_BlockIdx >= m_BlockTypes.size())
-	{
-		return E_BLOCK_AIR;
-	}
-
-	return m_BlockTypes[a_BlockIdx];
+	return m_ChunkData.GetBlock(a_RelX, a_RelY, a_RelZ);
 }
 
 
@@ -2558,9 +2447,8 @@ BLOCKTYPE cChunk::GetBlock(int a_BlockIdx) const
 
 void cChunk::GetBlockTypeMeta(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta)
 {
-	int Idx = cChunkDef::MakeIndexNoCheck(a_RelX, a_RelY, a_RelZ);
-	a_BlockType = GetBlock(Idx);
-	a_BlockMeta = cChunkDef::GetNibble(m_BlockMeta,  Idx);
+	a_BlockType = GetBlock(a_RelX, a_RelY, a_RelZ);
+	a_BlockMeta = m_ChunkData.GetMeta(a_RelX, a_RelY, a_RelZ);
 }
 
 
@@ -2569,11 +2457,10 @@ void cChunk::GetBlockTypeMeta(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE & a_
 
 void cChunk::GetBlockInfo(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_Meta, NIBBLETYPE & a_SkyLight, NIBBLETYPE & a_BlockLight)
 {
-	int Idx = cChunkDef::MakeIndexNoCheck(a_RelX, a_RelY, a_RelZ);
-	a_BlockType = GetBlock(Idx);
-	a_Meta       = cChunkDef::GetNibble(m_BlockMeta,     Idx);
-	a_SkyLight   = cChunkDef::GetNibble(m_BlockSkyLight, Idx);
-	a_BlockLight = cChunkDef::GetNibble(m_BlockLight,    Idx);
+	a_BlockType  = GetBlock(a_RelX, a_RelY, a_RelZ);
+	a_Meta       = m_ChunkData.GetMeta(a_RelX, a_RelY, a_RelZ);
+	a_SkyLight   = m_ChunkData.GetSkyLight(a_RelX, a_RelY, a_RelZ);
+	a_BlockLight = m_ChunkData.GetBlockLight(a_RelX, a_RelY, a_RelZ);
 }
 
 
diff --git a/src/Chunk.h b/src/Chunk.h
index 84ec35496..d95537acf 100644
--- a/src/Chunk.h
+++ b/src/Chunk.h
@@ -3,6 +3,7 @@
 
 #include "Entities/Entity.h"
 #include "ChunkDef.h"
+#include "ChunkData.h"
 
 #include "Simulator/FireSimulator.h"
 #include "Simulator/SandSimulator.h"
@@ -66,6 +67,7 @@ public:
 		cChunkMap * a_ChunkMap, cWorld * a_World,   // Parent objects
 		cChunk * a_NeighborXM, cChunk * a_NeighborXP, cChunk * a_NeighborZM, cChunk * a_NeighborZP  // Neighbor chunks
 	);
+	cChunk(cChunk & other);
 	~cChunk();
 
 	bool IsValid(void) const {return m_IsValid; }  // Returns true if the chunk block data is valid (loaded / generated)
@@ -154,7 +156,7 @@ public:
 
 	void FastSetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, BLOCKTYPE a_BlockMeta );  // 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(int a_BlockIdx) const;
+	BLOCKTYPE GetBlock(Vector3i a_cords) const { return GetBlock(a_cords.x, a_cords.y, a_cords.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);
 	
@@ -320,15 +322,23 @@ public:
 		m_BlockTickZ = a_RelZ;
 	}
 	
-	inline NIBBLETYPE GetMeta(int a_RelX, int a_RelY, int a_RelZ) const              { return cChunkDef::GetNibble(m_BlockMeta, a_RelX, a_RelY, a_RelZ); }
-	inline NIBBLETYPE GetMeta(int a_BlockIdx) const                                  { return cChunkDef::GetNibble(m_BlockMeta, a_BlockIdx); }
-	inline void       SetMeta(int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_Meta) { SetMeta(MakeIndex(a_RelX, a_RelY, a_RelZ), a_Meta); }
-	void SetMeta(int a_BlockIdx, NIBBLETYPE a_Meta);
+	inline NIBBLETYPE GetMeta(int a_RelX, int a_RelY, int a_RelZ) const
+	{
+		return m_ChunkData.GetMeta(a_RelX, a_RelY, a_RelZ);
+	}
+	inline void       SetMeta(int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_Meta)
+	{
+			bool hasChanged = m_ChunkData.SetMeta(a_RelX, a_RelY, a_RelZ, a_Meta);
+			if (hasChanged)
+			{
+				MarkDirty();
+				
+				m_PendingSendBlocks.push_back(sSetBlock(m_PosX, m_PosZ, a_RelX, a_RelY, a_RelZ, GetBlock(a_RelX, a_RelY, a_RelZ), a_Meta));
+			}
+	}
 
-	inline NIBBLETYPE GetBlockLight(int a_RelX, int a_RelY, int a_RelZ) const {return cChunkDef::GetNibble(m_BlockLight, a_RelX, a_RelY, a_RelZ); }
-	inline NIBBLETYPE GetSkyLight  (int a_RelX, int a_RelY, int a_RelZ) const {return cChunkDef::GetNibble(m_BlockSkyLight, a_RelX, a_RelY, a_RelZ, true); }
-	inline NIBBLETYPE GetBlockLight(int a_Idx) const {return cChunkDef::GetNibble(m_BlockLight, a_Idx); }
-	inline NIBBLETYPE GetSkyLight  (int a_Idx) const {return cChunkDef::GetNibble(m_BlockSkyLight, a_Idx, true); }
+	inline NIBBLETYPE GetBlockLight(int a_RelX, int a_RelY, int a_RelZ) const {return m_ChunkData.GetBlockLight(a_RelX, a_RelY, a_RelZ); }
+	inline NIBBLETYPE GetSkyLight  (int a_RelX, int a_RelY, int a_RelZ) const {return m_ChunkData.GetSkyLight(a_RelX, a_RelY, a_RelZ); }
 	
 	/** Same as GetBlock(), but relative coords needn't be in this chunk (uses m_Neighbor-s or m_ChunkMap in such a case); returns true on success */
 	bool UnboundedRelGetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta) const;
@@ -403,8 +413,8 @@ private:
 	bool m_IsSaving;       // True if the chunk is being saved
 	bool m_HasLoadFailed;  // True if chunk failed to load and hasn't been generated yet since then
 	
-	std::vector<unsigned int> m_ToTickBlocks;
-	sSetBlockVector           m_PendingSendBlocks;  ///< Blocks that have changed and need to be sent to all clients
+	std::vector<Vector3i> m_ToTickBlocks;
+	sSetBlockVector       m_PendingSendBlocks;  ///< Blocks that have changed and need to be sent to all clients
 	
 	sSetBlockQueueVector m_SetBlockQueue;  ///< Block changes that are queued to a specific tick
 	
@@ -420,10 +430,7 @@ private:
 	cWorld *    m_World;
 	cChunkMap * m_ChunkMap;
 
-	COMPRESSED_BLOCKTYPE m_BlockTypes;
-	COMPRESSED_NIBBLETYPE m_BlockMeta;
-	COMPRESSED_NIBBLETYPE m_BlockLight;
-	COMPRESSED_NIBBLETYPE m_BlockSkyLight;
+	cChunkData m_ChunkData;
 
 	cChunkDef::HeightMap m_HeightMap;
 	cChunkDef::BiomeMap  m_BiomeMap;
diff --git a/src/ChunkData.cpp b/src/ChunkData.cpp
new file mode 100644
index 000000000..142c141c4
--- /dev/null
+++ b/src/ChunkData.cpp
@@ -0,0 +1,592 @@
+
+// ChunkData.cpp
+
+// Implements the cChunkData class that represents the block's type, meta, blocklight and skylight storage for a chunk
+
+#include "Globals.h"
+#include "ChunkData.h"
+
+
+
+
+
+/** Returns true if all a_Array's elements between [0] and [a_NumElements - 1] are equal to a_Value. */
+template <typename T> inline bool IsAllValue(const T * a_Array, size_t a_NumElements, T a_Value)
+{
+	for (size_t i = 0; i < a_NumElements; i++)
+	{
+		if (a_Array[i] != a_Value)
+		{
+			return false;
+		}
+	}
+	return true;
+}
+
+
+
+
+
+cChunkData::cChunkData(void)
+#if __cplusplus < 201103L
+	// auto_ptr style interface for memory management
+	: m_IsOwner(true)
+#endif
+{
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		m_Sections[i] = NULL;
+	}
+}
+
+
+
+
+
+cChunkData::~cChunkData()
+{
+	#if __cplusplus < 201103L
+		// auto_ptr style interface for memory management
+		if (!m_IsOwner)
+		{
+			return;
+		}
+	#endif
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		Free(m_Sections[i]);
+		m_Sections[i] = NULL;
+	}
+}
+
+
+
+
+
+#if __cplusplus < 201103L
+	// auto_ptr style interface for memory management
+	cChunkData::cChunkData(const cChunkData & a_Other) :
+		m_IsOwner(true)
+	{
+		// Move contents and ownership from a_Other to this, pointer-wise:
+		for (size_t i = 0; i < NumSections; i++)
+		{
+			m_Sections[i] = a_Other.m_Sections[i];
+		}
+		a_Other.m_IsOwner = false;
+	}
+
+
+
+
+
+	cChunkData & cChunkData::operator =(const cChunkData & a_Other)
+	{
+		// If assigning to self, no-op
+		if (&a_Other == this)
+		{
+			return *this;
+		}
+		
+		// Free any currently held contents:
+		if (m_IsOwner)
+		{
+			for (size_t i = 0; i < NumSections; i++)
+			{
+				Free(m_Sections[i]);
+				m_Sections[i] = NULL;
+			}
+		}
+		
+		// Move contents and ownership from a_Other to this, pointer-wise:
+		m_IsOwner = true;
+		for (size_t i = 0; i < NumSections; i++)
+		{
+			m_Sections[i] = a_Other.m_Sections[i];
+		}
+		a_Other.m_IsOwner = false;
+		return *this;
+	}
+	
+#else
+
+	// unique_ptr style interface for memory management
+	cChunkData::cChunkData(cChunkData && other)
+	{
+		for (size_t i = 0; i < NumSections; i++)
+		{
+			m_Sections[i] = other.m_Sections[i];
+			other.m_Sections[i] = NULL;
+		}
+	}
+	
+	
+	
+	
+
+	cChunkData & cChunkData::operator =(cChunkData && other)
+	{
+		if (&other != this)
+		{
+			for (size_t i = 0; i < NumSections; i++)
+			{
+				Free(m_Sections[i]);
+				m_Sections[i] = other.m_Sections[i];
+				other.m_Sections[i] = NULL;
+			}
+		}
+		return *this;
+	}
+#endif
+
+
+
+
+
+BLOCKTYPE cChunkData::GetBlock(int a_X, int a_Y, int a_Z) const
+{
+	ASSERT((a_X >= 0) && (a_X < cChunkDef::Width));
+	ASSERT((a_Y >= 0) && (a_Y < cChunkDef::Height));
+	ASSERT((a_Z >= 0) && (a_Z < cChunkDef::Width));
+	int Section = a_Y / SectionHeight;
+	if (m_Sections[Section] != NULL)
+	{
+		int Index = cChunkDef::MakeIndexNoCheck(a_X, a_Y - (Section * SectionHeight), a_Z);
+		return m_Sections[Section]->m_BlockTypes[Index];
+	}
+	else
+	{
+		return 0;
+	}
+}
+
+
+
+
+
+void cChunkData::SetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_Block)
+{
+	if (
+		(a_RelX >= cChunkDef::Width)  || (a_RelX < 0) ||
+		(a_RelY >= cChunkDef::Height) || (a_RelY < 0) ||
+		(a_RelZ >= cChunkDef::Width)  || (a_RelZ < 0)
+	)
+	{
+		ASSERT(!"cChunkData::SetMeta(): index out of range!");
+		return;
+	}
+
+	int Section = a_RelY / SectionHeight;
+	if (m_Sections[Section] == NULL)
+	{
+		if (a_Block == 0x00)
+		{
+			return;
+		}
+		m_Sections[Section] = Allocate();
+		if (m_Sections[Section] == NULL)
+		{
+			ASSERT(!"Failed to allocate a new section in Chunkbuffer");
+			return;
+		}
+		ZeroSection(m_Sections[Section]);
+	}
+	int Index = cChunkDef::MakeIndexNoCheck(a_RelX, a_RelY - (Section * SectionHeight), a_RelZ);
+	m_Sections[Section]->m_BlockTypes[Index] = a_Block;
+}
+
+
+
+
+
+NIBBLETYPE cChunkData::GetMeta(int a_RelX, int a_RelY, int a_RelZ) const
+{
+	if (
+		(a_RelX < cChunkDef::Width) && (a_RelX > -1) &&
+		(a_RelY < cChunkDef::Height) && (a_RelY > -1) &&
+		(a_RelZ < cChunkDef::Width) && (a_RelZ > -1))
+	{
+		int Section = a_RelY / SectionHeight;
+		if (m_Sections[Section] != NULL)
+		{
+			int Index = cChunkDef::MakeIndexNoCheck(a_RelX, a_RelY - (Section * SectionHeight), a_RelZ);
+			return (m_Sections[Section]->m_BlockMetas[Index / 2] >> ((Index & 1) * 4)) & 0x0f;
+		}
+		else
+		{
+			return 0;
+		}
+	}
+	ASSERT(!"cChunkData::GetMeta(): coords out of chunk range!");
+	return 0;
+}
+
+
+
+
+
+bool cChunkData::SetMeta(int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_Nibble)
+{
+	if (
+		(a_RelX >= cChunkDef::Width)  || (a_RelX < 0) ||
+		(a_RelY >= cChunkDef::Height) || (a_RelY < 0) ||
+		(a_RelZ >= cChunkDef::Width)  || (a_RelZ < 0)
+	)
+	{
+		ASSERT(!"cChunkData::SetMeta(): index out of range!");
+		return false;
+	}
+
+	int Section = a_RelY / SectionHeight;
+	if (m_Sections[Section] == NULL)
+	{
+		if ((a_Nibble & 0xf) == 0x00)
+		{
+			return false;
+		}
+		m_Sections[Section] = Allocate();
+		if (m_Sections[Section] == NULL)
+		{
+			ASSERT(!"Failed to allocate a new section in Chunkbuffer");
+			return false;
+		}
+		ZeroSection(m_Sections[Section]);
+	}
+	int Index = cChunkDef::MakeIndexNoCheck(a_RelX, a_RelY - (Section * SectionHeight), a_RelZ);
+	NIBBLETYPE oldval = m_Sections[Section]->m_BlockMetas[Index / 2] >> ((Index & 1) * 4) & 0xf;
+	m_Sections[Section]->m_BlockMetas[Index / 2] = static_cast<NIBBLETYPE>(
+		(m_Sections[Section]->m_BlockMetas[Index / 2] & (0xf0 >> ((Index & 1) * 4))) |  // The untouched nibble
+		((a_Nibble & 0x0f) << ((Index & 1) * 4))  // The nibble being set
+	);
+	return oldval == a_Nibble;
+}
+
+
+
+
+
+NIBBLETYPE cChunkData::GetBlockLight(int a_RelX, int a_RelY, int a_RelZ) const
+{
+	if (
+		(a_RelX < cChunkDef::Width) && (a_RelX > -1) &&
+		(a_RelY < cChunkDef::Height) && (a_RelY > -1) &&
+		(a_RelZ < cChunkDef::Width) && (a_RelZ > -1)
+	)
+	{
+		int Section = a_RelY / SectionHeight;
+		if (m_Sections[Section] != NULL)
+		{
+			int Index = cChunkDef::MakeIndexNoCheck(a_RelX, a_RelY - (Section * SectionHeight), a_RelZ);
+			return (m_Sections[Section]->m_BlockLight[Index / 2] >> ((Index & 1) * 4)) & 0x0f;
+		}
+		else
+		{
+			return 0;
+		}
+	}
+	ASSERT(!"cChunkData::GetMeta(): coords out of chunk range!");
+	return 0;
+}
+
+
+
+
+
+NIBBLETYPE cChunkData::GetSkyLight(int a_RelX, int a_RelY, int a_RelZ) const
+{
+	if ((a_RelX < cChunkDef::Width) && (a_RelX > -1) && (a_RelY < cChunkDef::Height) && (a_RelY > -1) && (a_RelZ < cChunkDef::Width) && (a_RelZ > -1))
+	{
+		int Section = a_RelY / SectionHeight;
+		if (m_Sections[Section] != NULL)
+		{
+			int Index = cChunkDef::MakeIndexNoCheck(a_RelX, a_RelY - (Section * SectionHeight), a_RelZ);
+			return (m_Sections[Section]->m_BlockLight[Index / 2] >> ((Index & 1) * 4)) & 0x0f;
+		}
+		else
+		{
+			return 0xF;
+		}
+	}
+	ASSERT(!"cChunkData::GetMeta(): coords out of chunk range!");
+	return 0;
+}
+
+
+
+
+
+cChunkData cChunkData::Copy(void) const
+{
+	cChunkData copy;
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		if (m_Sections[i] != NULL)
+		{
+			copy.m_Sections[i] = Allocate();
+			*copy.m_Sections[i] = *m_Sections[i];
+		}
+	}
+	return copy;
+}
+
+
+
+
+
+void cChunkData::CopyBlockTypes(BLOCKTYPE * a_Dest, size_t a_Idx, size_t a_Length) const
+{
+	size_t ToSkip = a_Idx;
+	
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		size_t StartPos = 0;
+		if (ToSkip > 0)
+		{
+			StartPos = std::min(ToSkip, +SectionBlockCount);
+			ToSkip -= StartPos;
+		}
+		if (StartPos < SectionBlockCount)
+		{
+			size_t ToCopy = std::min(+SectionBlockCount - StartPos, a_Length);
+			a_Length -= ToCopy;
+			if (m_Sections[i] != NULL)
+			{
+				BLOCKTYPE * blockbuffer = m_Sections[i]->m_BlockTypes;
+				memcpy(&a_Dest[(i * SectionBlockCount) + StartPos - a_Idx], blockbuffer + StartPos, sizeof(BLOCKTYPE) * ToCopy);
+			}
+			else
+			{
+				memset(&a_Dest[(i * SectionBlockCount) - a_Idx], 0, sizeof(BLOCKTYPE) * ToCopy);
+			}
+		}
+	}
+}
+
+
+
+
+
+void cChunkData::CopyMetas(NIBBLETYPE * a_Dest) const
+{
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		if (m_Sections[i] != NULL)
+		{
+			memcpy(&a_Dest[i * SectionBlockCount / 2], &m_Sections[i]->m_BlockMetas, sizeof(m_Sections[i]->m_BlockMetas));
+		}
+		else
+		{
+			memset(&a_Dest[i * SectionBlockCount / 2], 0, sizeof(m_Sections[i]->m_BlockMetas));
+		}
+	}
+}
+
+
+
+
+
+void cChunkData::CopyBlockLight(NIBBLETYPE * a_Dest) const
+{
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		if (m_Sections[i] != NULL)
+		{
+			memcpy(&a_Dest[i * SectionBlockCount / 2], &m_Sections[i]->m_BlockLight, sizeof(m_Sections[i]->m_BlockLight));
+		}
+		else
+		{
+			memset(&a_Dest[i * SectionBlockCount / 2], 0, sizeof(m_Sections[i]->m_BlockLight));
+		}
+	}
+}
+
+
+
+
+
+void cChunkData::CopySkyLight(NIBBLETYPE * a_Dest) const
+{
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		if (m_Sections[i] != NULL)
+		{
+			memcpy(&a_Dest[i * SectionBlockCount / 2], &m_Sections[i]->m_BlockSkyLight, sizeof(m_Sections[i]->m_BlockSkyLight));
+		}
+		else
+		{
+			memset(&a_Dest[i * SectionBlockCount / 2], 0xff, sizeof(m_Sections[i]->m_BlockSkyLight));
+		}
+	}
+}
+
+
+
+
+
+void cChunkData::SetBlockTypes(const BLOCKTYPE * a_Src)
+{
+	ASSERT(a_Src != NULL);
+	
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		// If the section is already allocated, copy the data into it:
+		if (m_Sections[i] != NULL)
+		{
+			memcpy(m_Sections[i]->m_BlockTypes, &a_Src[i * SectionBlockCount], sizeof(m_Sections[i]->m_BlockTypes));
+			continue;
+		}
+
+		// The section doesn't exist, find out if it is needed:
+		if (IsAllValue(a_Src + i * SectionBlockCount, SectionBlockCount, (const BLOCKTYPE)0))
+		{
+			// No need for the section, the data is all-air
+			continue;
+		}
+		
+		// Allocate the section and copy the data into it:
+		m_Sections[i] = Allocate();
+		memcpy(m_Sections[i]->m_BlockTypes, &a_Src[i * SectionBlockCount], sizeof(m_Sections[i]->m_BlockTypes));
+		memset(m_Sections[i]->m_BlockMetas,    0x00, sizeof(m_Sections[i]->m_BlockMetas));
+		memset(m_Sections[i]->m_BlockLight,    0x00, sizeof(m_Sections[i]->m_BlockLight));
+		memset(m_Sections[i]->m_BlockSkyLight, 0xff, sizeof(m_Sections[i]->m_BlockSkyLight));
+	}  // for i - m_Sections[]
+}
+
+
+
+
+void cChunkData::SetMetas(const NIBBLETYPE * a_Src)
+{
+	ASSERT(a_Src != NULL);
+	
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		// If the section is already allocated, copy the data into it:
+		if (m_Sections[i] != NULL)
+		{
+			memcpy(m_Sections[i]->m_BlockMetas, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockMetas));
+			continue;
+		}
+		
+		// The section doesn't exist, find out if it is needed:
+		if (IsAllValue(a_Src + i * SectionBlockCount / 2, SectionBlockCount / 2, (NIBBLETYPE)0))
+		{
+			// No need for the section, the data is all zeroes
+			continue;
+		}
+		
+		// Allocate the section and copy the data into it:
+		m_Sections[i] = Allocate();
+		memcpy(m_Sections[i]->m_BlockMetas, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockMetas));
+		memset(m_Sections[i]->m_BlockTypes,    0x00, sizeof(m_Sections[i]->m_BlockTypes));
+		memset(m_Sections[i]->m_BlockLight,    0x00, sizeof(m_Sections[i]->m_BlockLight));
+		memset(m_Sections[i]->m_BlockSkyLight, 0xff, sizeof(m_Sections[i]->m_BlockSkyLight));
+	}  // for i - m_Sections[]
+}
+
+
+
+
+
+void cChunkData::SetBlockLight(const NIBBLETYPE * a_Src)
+{
+	if (a_Src == NULL)
+	{
+		return;
+	}
+	
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		// If the section is already allocated, copy the data into it:
+		if (m_Sections[i] != NULL)
+		{
+			memcpy(m_Sections[i]->m_BlockLight, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockLight));
+			continue;
+		}
+		
+		// The section doesn't exist, find out if it is needed:
+		if (IsAllValue(a_Src + i * SectionBlockCount / 2, SectionBlockCount / 2, (NIBBLETYPE)0))
+		{
+			// No need for the section, the data is all zeroes
+			continue;
+		}
+		
+		// Allocate the section and copy the data into it:
+		m_Sections[i] = Allocate();
+		memcpy(m_Sections[i]->m_BlockLight, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockLight));
+		memset(m_Sections[i]->m_BlockTypes,    0x00, sizeof(m_Sections[i]->m_BlockTypes));
+		memset(m_Sections[i]->m_BlockMetas,    0x00, sizeof(m_Sections[i]->m_BlockMetas));
+		memset(m_Sections[i]->m_BlockSkyLight, 0xff, sizeof(m_Sections[i]->m_BlockSkyLight));
+	}  // for i - m_Sections[]
+}
+
+
+
+
+void cChunkData::SetSkyLight(const NIBBLETYPE * a_Src)
+{
+	if (a_Src == NULL)
+	{
+		return;
+	}
+	
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		// If the section is already allocated, copy the data into it:
+		if (m_Sections[i] != NULL)
+		{
+			memcpy(m_Sections[i]->m_BlockSkyLight, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockSkyLight));
+			continue;
+		}
+
+		// The section doesn't exist, find out if it is needed:
+		if (IsAllValue(a_Src + i * SectionBlockCount / 2, SectionBlockCount / 2, (NIBBLETYPE)0xff))
+		{
+			// No need for the section, the data is all zeroes
+			continue;
+		}
+		
+		// Allocate the section and copy the data into it:
+		m_Sections[i] = Allocate();
+		memcpy(m_Sections[i]->m_BlockSkyLight, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockSkyLight));
+		memset(m_Sections[i]->m_BlockTypes, 0x00, sizeof(m_Sections[i]->m_BlockTypes));
+		memset(m_Sections[i]->m_BlockMetas, 0x00, sizeof(m_Sections[i]->m_BlockMetas));
+		memset(m_Sections[i]->m_BlockLight, 0x00, sizeof(m_Sections[i]->m_BlockLight));
+	}  // for i - m_Sections[]
+}
+
+
+
+
+
+cChunkData::sChunkSection * cChunkData::Allocate(void)
+{
+	// TODO: Use an allocation pool
+	return new cChunkData::sChunkSection;
+}
+
+
+
+
+
+void cChunkData::Free(cChunkData::sChunkSection * a_Section)
+{
+	// TODO: Use an allocation pool
+	delete a_Section;
+}
+
+
+
+
+
+void cChunkData::ZeroSection(cChunkData::sChunkSection * a_Section) const
+{
+	memset(a_Section->m_BlockTypes,    0x00, sizeof(a_Section->m_BlockTypes));
+	memset(a_Section->m_BlockMetas,    0x00, sizeof(a_Section->m_BlockMetas));
+	memset(a_Section->m_BlockLight,    0x00, sizeof(a_Section->m_BlockLight));
+	memset(a_Section->m_BlockSkyLight, 0xff, sizeof(a_Section->m_BlockSkyLight));
+}
+
+
+
+
diff --git a/src/ChunkData.h b/src/ChunkData.h
new file mode 100644
index 000000000..fef31b5ad
--- /dev/null
+++ b/src/ChunkData.h
@@ -0,0 +1,125 @@
+
+// ChunkData.h
+
+// Declares the cChunkData class that represents the block's type, meta, blocklight and skylight storage for a chunk
+
+
+
+
+
+#pragma once
+
+
+#include <cstring>
+
+
+#include "ChunkDef.h"
+
+
+
+
+#if __cplusplus < 201103L
+// auto_ptr style interface for memory management
+#else
+// unique_ptr style interface for memory management
+#endif
+
+class cChunkData
+{
+public:
+
+	cChunkData(void);
+	~cChunkData();
+	
+	#if __cplusplus < 201103L
+		// auto_ptr style interface for memory management
+		cChunkData(const cChunkData & a_Other);
+		cChunkData & operator =(const cChunkData & a_Other);
+	#else
+		// unique_ptr style interface for memory management
+		cChunkData(cChunkData && a_Other);
+		cChunkData & operator =(cChunkData && a_ther);
+	#endif
+
+	BLOCKTYPE GetBlock(int a_X, int a_Y, int a_Z) const;
+	void SetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_Block);
+
+	NIBBLETYPE GetMeta(int a_RelX, int a_RelY, int a_RelZ) const;
+	bool SetMeta(int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_Nibble);
+	
+	NIBBLETYPE GetBlockLight(int a_RelX, int a_RelY, int a_RelZ) const;
+	
+	NIBBLETYPE GetSkyLight(int a_RelX, int a_RelY, int a_RelZ) const;
+	
+	/** Creates a (deep) copy of self. */
+	cChunkData Copy(void) const;
+	
+	/** Copies the blocktype data into the specified flat array.
+	Optionally, only a part of the data is copied, as specified by the a_Idx and a_Length parameters. */
+	void CopyBlockTypes(BLOCKTYPE * a_Dest, size_t a_Idx = 0, size_t a_Length = cChunkDef::NumBlocks) const;
+	
+	/** Copies the metadata into the specified flat array. */
+	void CopyMetas(NIBBLETYPE * a_Dest) const;
+	
+	/** Copies the block light data into the specified flat array. */
+	void CopyBlockLight(NIBBLETYPE * a_Dest) const;
+	
+	/** Copies the skylight data into the specified flat array. */
+	void CopySkyLight  (NIBBLETYPE * a_Dest) const;
+	
+	/** Copies the blocktype data from the specified flat array into the internal representation.
+	Allocates sections that are needed for the operation.
+	Requires that a_Src is a valid pointer. */
+	void SetBlockTypes(const BLOCKTYPE * a_Src);
+	
+	/** Copies the metadata from the specified flat array into the internal representation.
+	Allocates sectios that are needed for the operation.
+	Requires that a_Src is a valid pointer. */
+	void SetMetas(const NIBBLETYPE * a_Src);
+	
+	/** Copies the blocklight data from the specified flat array into the internal representation.
+	Allocates sectios that are needed for the operation.
+	Allows a_Src to be NULL, in which case it doesn't do anything. */
+	void SetBlockLight(const NIBBLETYPE * a_Src);
+
+	/** Copies the skylight data from the specified flat array into the internal representation.
+	Allocates sectios that are needed for the operation.
+	Allows a_Src to be NULL, in which case it doesn't do anything. */
+	void SetSkyLight(const NIBBLETYPE * a_Src);
+	
+private:
+
+	static const size_t SectionHeight = 16;
+	static const size_t NumSections = (cChunkDef::Height / SectionHeight);
+	static const size_t SectionBlockCount = SectionHeight * cChunkDef::Width * cChunkDef::Width;
+
+	#if __cplusplus < 201103L
+	// auto_ptr style interface for memory management
+	mutable bool m_IsOwner;
+	#endif
+	
+	struct sChunkSection {
+		BLOCKTYPE  m_BlockTypes   [SectionBlockCount];
+		NIBBLETYPE m_BlockMetas   [SectionBlockCount / 2];
+		NIBBLETYPE m_BlockLight   [SectionBlockCount / 2];
+		NIBBLETYPE m_BlockSkyLight[SectionBlockCount / 2];
+	};
+	
+	sChunkSection * m_Sections[NumSections];
+	
+	/** Allocates a new section. Entry-point to custom allocators. */
+	static sChunkSection * Allocate(void);
+	
+	/** Frees the specified section, previously allocated using Allocate().
+	Note that a_Section may be NULL. */
+	static void Free(sChunkSection * a_Section);
+	
+	/** Sets the data in the specified section to their default values. */
+	void ZeroSection(sChunkSection * a_Section) const;
+};
+
+
+
+
+
+
diff --git a/src/ChunkDataCallback.h b/src/ChunkDataCallback.h
new file mode 100644
index 000000000..0c8b1098f
--- /dev/null
+++ b/src/ChunkDataCallback.h
@@ -0,0 +1,127 @@
+
+// ChunkDataCallback.h
+
+// Declares the cChunkDataCallback interface and several trivial descendants, for reading chunk data
+
+
+
+
+
+#pragma once
+
+#include "ChunkData.h"
+
+
+
+
+
+/** Interface class used for getting data out of a chunk using the GetAllData() function.
+Implementation must use the pointers immediately and NOT store any of them for later use
+The virtual methods are called in the same order as they're declared here.
+*/
+class cChunkDataCallback abstract
+{
+public:
+
+	virtual ~cChunkDataCallback() {}
+
+	/** Called before any other callbacks to inform of the current coords 
+	(only in processes where multiple chunks can be processed, such as cWorld::ForEachChunkInRect()). 
+	If false is returned, the chunk is skipped.
+	*/
+	virtual bool Coords(int a_ChunkX, int a_ChunkZ) { UNUSED(a_ChunkX); UNUSED(a_ChunkZ); return true; };
+	
+	/// Called once to provide heightmap data
+	virtual void HeightMap(const cChunkDef::HeightMap * a_HeightMap) {UNUSED(a_HeightMap); };
+	
+	/// Called once to provide biome data
+	virtual void BiomeData(const cChunkDef::BiomeMap * a_BiomeMap) {UNUSED(a_BiomeMap); };
+	
+	/// Called once to let know if the chunk lighting is valid. Return value is ignored
+	virtual void LightIsValid(bool a_IsLightValid) {UNUSED(a_IsLightValid); };
+	
+	/// Called once to export block info
+	virtual void ChunkData(const cChunkData & a_Buffer) {UNUSED(a_Buffer); };
+	
+	/// Called for each entity in the chunk
+	virtual void Entity(cEntity * a_Entity) {UNUSED(a_Entity); };
+	
+	/// Called for each blockentity in the chunk
+	virtual void BlockEntity(cBlockEntity * a_Entity) {UNUSED(a_Entity); };
+} ;
+
+
+
+
+
+/** A simple implementation of the cChunkDataCallback interface that collects all block data into a buffer
+*/
+class cChunkDataCollector :
+	public cChunkDataCallback
+{
+public:
+
+	cChunkData m_BlockData;
+
+protected:
+
+	virtual void ChunkData(const cChunkData & a_BlockData) override
+	{
+		m_BlockData = a_BlockData.Copy();
+	}
+};
+
+
+
+
+
+/** A simple implementation of the cChunkDataCallback interface that collects all block data into a single buffer
+*/
+class cChunkDataArrayCollector :
+	public cChunkDataCallback
+{
+public:
+
+	// Must be unsigned char instead of BLOCKTYPE or NIBBLETYPE, because it houses both.
+	unsigned char m_BlockData[cChunkDef::BlockDataSize];
+
+protected:
+
+	virtual void ChunkData(const cChunkData & a_ChunkBuffer) override
+	{
+		a_ChunkBuffer.CopyBlockTypes(m_BlockData);
+		a_ChunkBuffer.CopyMetas(m_BlockData + cChunkDef::NumBlocks);
+		a_ChunkBuffer.CopyBlockLight(m_BlockData + 3 * cChunkDef::NumBlocks / 2);
+		a_ChunkBuffer.CopySkyLight(m_BlockData + 2 * cChunkDef::NumBlocks);
+	}
+};
+
+
+
+
+
+/** A simple implementation of the cChunkDataCallback interface that collects all block data into separate buffers */
+class cChunkDataSeparateCollector :
+	public cChunkDataCallback
+{
+public:
+
+	cChunkDef::BlockTypes m_BlockTypes;
+	cChunkDef::BlockNibbles m_BlockMetas;
+	cChunkDef::BlockNibbles m_BlockLight;
+	cChunkDef::BlockNibbles m_BlockSkyLight;
+
+protected:
+
+	virtual void ChunkData(const cChunkData & a_ChunkBuffer) override
+	{
+		a_ChunkBuffer.CopyBlockTypes(m_BlockTypes);
+		a_ChunkBuffer.CopyMetas(m_BlockMetas);
+		a_ChunkBuffer.CopyBlockLight(m_BlockLight);
+		a_ChunkBuffer.CopySkyLight(m_BlockSkyLight);
+	}
+} ;
+
+
+
+
diff --git a/src/ChunkDef.h b/src/ChunkDef.h
index 83f3c8f5f..f89e16ed1 100644
--- a/src/ChunkDef.h
+++ b/src/ChunkDef.h
@@ -330,136 +330,6 @@ private:
 
 
 
-/** Interface class used for getting data out of a chunk using the GetAllData() function.
-Implementation must use the pointers immediately and NOT store any of them for later use
-The virtual methods are called in the same order as they're declared here.
-*/
-class cChunkDataCallback abstract
-{
-public:
-
-	virtual ~cChunkDataCallback() {}
-
-	/** Called before any other callbacks to inform of the current coords 
-	(only in processes where multiple chunks can be processed, such as cWorld::ForEachChunkInRect()). 
-	If false is returned, the chunk is skipped.
-	*/
-	virtual bool Coords(int a_ChunkX, int a_ChunkZ) { UNUSED(a_ChunkX); UNUSED(a_ChunkZ); return true; };
-	
-	/// Called once to provide heightmap data
-	virtual void HeightMap(const cChunkDef::HeightMap * a_HeightMap) {UNUSED(a_HeightMap); };
-	
-	/// Called once to provide biome data
-	virtual void BiomeData    (const cChunkDef::BiomeMap * a_BiomeMap) {UNUSED(a_BiomeMap); };
-	
-	/// Called once to export block types
-	virtual void BlockTypes   (const BLOCKTYPE * a_Type) {UNUSED(a_Type); };
-	
-	/// Called once to export block meta
-	virtual void BlockMeta    (const NIBBLETYPE * a_Meta) {UNUSED(a_Meta); };
-	
-	/// Called once to let know if the chunk lighting is valid. Return value is used to control if BlockLight() and BlockSkyLight() are called next (if true)
-	virtual bool LightIsValid(bool a_IsLightValid) {UNUSED(a_IsLightValid); return true; };
-
-	/// Called once to export block light
-	virtual void BlockLight   (const NIBBLETYPE * a_BlockLight) {UNUSED(a_BlockLight); };
-	
-	/// Called once to export sky light
-	virtual void BlockSkyLight(const NIBBLETYPE * a_SkyLight) {UNUSED(a_SkyLight); };
-	
-	/// Called for each entity in the chunk
-	virtual void Entity(cEntity * a_Entity) {UNUSED(a_Entity); };
-	
-	/// Called for each blockentity in the chunk
-	virtual void BlockEntity(cBlockEntity * a_Entity) {UNUSED(a_Entity); };
-} ;
-
-
-
-
-
-/** A simple implementation of the cChunkDataCallback interface that collects all block data into a single buffer
-*/
-class cChunkDataCollector :
-	public cChunkDataCallback
-{
-public:
-
-	// Must be unsigned char instead of BLOCKTYPE or NIBBLETYPE, because it houses both.
-	unsigned char m_BlockData[cChunkDef::BlockDataSize];
-
-protected:
-
-	virtual void BlockTypes(const BLOCKTYPE * a_BlockTypes) override
-	{
-		memcpy(m_BlockData, a_BlockTypes, sizeof(cChunkDef::BlockTypes));
-	}
-
-
-	virtual void BlockMeta(const NIBBLETYPE * a_BlockMeta) override
-	{
-		memcpy(m_BlockData + cChunkDef::NumBlocks, a_BlockMeta, cChunkDef::NumBlocks / 2);
-	}
-
-
-	virtual void BlockLight(const NIBBLETYPE * a_BlockLight) override
-	{
-		memcpy(m_BlockData + 3 * cChunkDef::NumBlocks / 2, a_BlockLight, cChunkDef::NumBlocks / 2);
-	}
-
-
-	virtual void BlockSkyLight(const NIBBLETYPE * a_BlockSkyLight) override
-	{
-		memcpy(m_BlockData + 2 * cChunkDef::NumBlocks, a_BlockSkyLight, cChunkDef::NumBlocks / 2);
-	}
-} ;
-
-
-
-
-
-/** A simple implementation of the cChunkDataCallback interface that collects all block data into a separate buffers
-*/
-class cChunkDataSeparateCollector :
-	public cChunkDataCallback
-{
-public:
-
-	cChunkDef::BlockTypes   m_BlockTypes;
-	cChunkDef::BlockNibbles m_BlockMetas;
-	cChunkDef::BlockNibbles m_BlockLight;
-	cChunkDef::BlockNibbles m_BlockSkyLight;
-
-protected:
-
-	virtual void BlockTypes(const BLOCKTYPE * a_BlockTypes) override
-	{
-		memcpy(m_BlockTypes, a_BlockTypes, sizeof(m_BlockTypes));
-	}
-
-
-	virtual void BlockMeta(const NIBBLETYPE * a_BlockMeta) override
-	{
-		memcpy(m_BlockMetas, a_BlockMeta, sizeof(m_BlockMetas));
-	}
-
-
-	virtual void BlockLight(const NIBBLETYPE * a_BlockLight) override
-	{
-		memcpy(m_BlockLight, a_BlockLight, sizeof(m_BlockLight));
-	}
-
-
-	virtual void BlockSkyLight(const NIBBLETYPE * a_BlockSkyLight) override
-	{
-		memcpy(m_BlockSkyLight, a_BlockSkyLight, sizeof(m_BlockSkyLight));
-	}
-} ;
-
-
-
-
-
 /** Interface class used for comparing clients of two chunks.
 Used primarily for entity moving while both chunks are locked.
 */
diff --git a/src/ChunkMap.cpp b/src/ChunkMap.cpp
index d7164a6a5..d3f44bef8 100644
--- a/src/ChunkMap.cpp
+++ b/src/ChunkMap.cpp
@@ -219,9 +219,8 @@ bool cChunkMap::LockedGetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTY
 		return false;
 	}
 	
-	int Index = cChunkDef::MakeIndexNoCheck(a_BlockX, a_BlockY, a_BlockZ);
-	a_BlockType = Chunk->GetBlock(Index);
-	a_BlockMeta = Chunk->GetMeta(Index);
+	a_BlockType = Chunk->GetBlock(a_BlockX, a_BlockY, a_BlockZ);
+	a_BlockMeta = Chunk->GetMeta(a_BlockX, a_BlockY, a_BlockZ);
 	return true;
 }
 
@@ -242,8 +241,7 @@ bool cChunkMap::LockedGetBlockType(int a_BlockX, int a_BlockY, int a_BlockZ, BLO
 		return false;
 	}
 	
-	int Index = cChunkDef::MakeIndexNoCheck(a_BlockX, a_BlockY, a_BlockZ);
-	a_BlockType = Chunk->GetBlock(Index);
+	a_BlockType = Chunk->GetBlock(a_BlockX, a_BlockY, a_BlockZ);
 	return true;
 }
 
@@ -264,8 +262,7 @@ bool cChunkMap::LockedGetBlockMeta(int a_BlockX, int a_BlockY, int a_BlockZ, NIB
 		return false;
 	}
 	
-	int Index = cChunkDef::MakeIndexNoCheck(a_BlockX, a_BlockY, a_BlockZ);
-	a_BlockMeta = Chunk->GetMeta(Index);
+	a_BlockMeta = Chunk->GetMeta(a_BlockX, a_BlockY, a_BlockZ);
 	return true;
 }
 
@@ -1484,9 +1481,8 @@ bool cChunkMap::GetBlocks(sSetBlockVector & a_Blocks, bool a_ContinueOnFailure)
 			res = false;
 			continue;
 		}
-		int idx = cChunkDef::MakeIndexNoCheck(itr->x, itr->y, itr->z);
-		itr->BlockType = Chunk->GetBlock(idx);
-		itr->BlockMeta = Chunk->GetMeta(idx);
+		itr->BlockType = Chunk->GetBlock(itr->x, itr->y, itr->z);
+		itr->BlockMeta = Chunk->GetMeta(itr->x, itr->y, itr->z);
 	}
 	return res;
 }
diff --git a/src/ChunkMap.h b/src/ChunkMap.h
index 9d973f2a9..c3deda088 100644
--- a/src/ChunkMap.h
+++ b/src/ChunkMap.h
@@ -5,7 +5,8 @@
 
 #pragma once
 
-#include "ChunkDef.h"
+
+#include "ChunkDataCallback.h"
 
 
 
diff --git a/src/ChunkSender.h b/src/ChunkSender.h
index a26f764a7..00565d7c3 100644
--- a/src/ChunkSender.h
+++ b/src/ChunkSender.h
@@ -27,6 +27,7 @@ Note that it may be called by world's BroadcastToChunk() if the client is still
 
 #include "OSSupport/IsThread.h"
 #include "ChunkDef.h"
+#include "ChunkDataCallback.h"
 
 
 
diff --git a/src/Entities/FallingBlock.cpp b/src/Entities/FallingBlock.cpp
index beb58f207..111c5fa84 100644
--- a/src/Entities/FallingBlock.cpp
+++ b/src/Entities/FallingBlock.cpp
@@ -55,9 +55,8 @@ void cFallingBlock::Tick(float a_Dt, cChunk & a_Chunk)
 		return;
 	}
 	
-	int idx = a_Chunk.MakeIndexNoCheck(BlockX - a_Chunk.GetPosX() * cChunkDef::Width, BlockY, BlockZ - a_Chunk.GetPosZ() * cChunkDef::Width);
-	BLOCKTYPE BlockBelow = a_Chunk.GetBlock(idx);
-	NIBBLETYPE BelowMeta = a_Chunk.GetMeta(idx);
+	BLOCKTYPE BlockBelow = a_Chunk.GetBlock(BlockX - a_Chunk.GetPosX() * cChunkDef::Width, BlockY, BlockZ - a_Chunk.GetPosZ() * cChunkDef::Width);
+	NIBBLETYPE BelowMeta = a_Chunk.GetMeta(BlockX - a_Chunk.GetPosX() * cChunkDef::Width, BlockY, BlockZ - a_Chunk.GetPosZ() * cChunkDef::Width);
 	if (cSandSimulator::DoesBreakFallingThrough(BlockBelow, BelowMeta))
 	{
 		// Fallen onto a block that breaks this into pickups (e. g. half-slab)
diff --git a/src/Globals.h b/src/Globals.h
index 71e9191e4..c5768facf 100644
--- a/src/Globals.h
+++ b/src/Globals.h
@@ -225,16 +225,28 @@ template class SizeChecker<UInt16, 2>;
 
 
 
+#ifndef TEST_GLOBALS
+	// Common headers (part 1, without macros):
+	#include "StringUtils.h"
+	#include "OSSupport/Sleep.h"
+	#include "OSSupport/CriticalSection.h"
+	#include "OSSupport/Semaphore.h"
+	#include "OSSupport/Event.h"
+	#include "OSSupport/Thread.h"
+	#include "OSSupport/File.h"
+	#include "MCLogger.h"
+#else
+	// Logging functions
+void inline LOGERROR(const char* a_Format, ...) FORMATSTRING(1,2);
 
-// Common headers (part 1, without macros):
-#include "StringUtils.h"
-#include "OSSupport/Sleep.h"
-#include "OSSupport/CriticalSection.h"
-#include "OSSupport/Semaphore.h"
-#include "OSSupport/Event.h"
-#include "OSSupport/Thread.h"
-#include "OSSupport/File.h"
-#include "MCLogger.h"
+void inline LOGERROR(const char* a_Format, ...)
+{
+	va_list argList;
+	va_start(argList, a_Format);
+	vprintf(a_Format, argList);
+	va_end(argList);
+}
+#endif
 
 
 
@@ -253,10 +265,44 @@ template class SizeChecker<UInt16, 2>;
 #define FAST_FLOOR_DIV( x, div ) (((x) - (((x) < 0) ? ((div) - 1) : 0)) / (div))
 
 // Own version of assert() that writes failed assertions to the log for review
-#ifdef  _DEBUG
-	#define ASSERT( x ) ( !!(x) || ( LOGERROR("Assertion failed: %s, file %s, line %i", #x, __FILE__, __LINE__ ), assert(0), 0 ) )
+#ifdef TEST_GLOBALS
+
+	class cAssertFailure
+	{
+	};
+
+	#ifdef _WIN32
+		#if (defined(_MSC_VER) && defined(_DEBUG))
+			#define DBG_BREAK _CrtDbgBreak()
+		#else
+			#define DBG_BREAK
+		#endif
+		#define REPORT_ERROR(FMT, ...) \
+		{ \
+			AString msg = Printf(FMT, __VA_ARGS__); \
+			puts(msg.c_str()); \
+			fflush(stdout); \
+			OutputDebugStringA(msg.c_str()); \
+			DBG_BREAK; \
+		}
+	#else
+		#define REPORT_ERROR(FMT, ...) \
+		{ \
+			AString msg = Printf(FMT, __VA_ARGS__); \
+			puts(msg.c_str()); \
+			fflush(stdout); \
+		}
+	#endif
+	#define ASSERT(x) do { if (!(x)) { throw cAssertFailure();} } while (0)
+	#define testassert(x) do { if(!(x)) { REPORT_ERROR("Test failure: %s, file %s, line %d\n", #x, __FILE__, __LINE__); exit(1); } } while (0)
+	#define CheckAsserts(x) do { try {x} catch (cAssertFailure) { break; } REPORT_ERROR("Test failure: assert didn't fire for %s, file %s, line %d\n", #x, __FILE__, __LINE__); exit(1); } while (0)
+
 #else
-	#define ASSERT(x) ((void)(x))
+	#ifdef  _DEBUG
+		#define ASSERT( x ) ( !!(x) || ( LOGERROR("Assertion failed: %s, file %s, line %i", #x, __FILE__, __LINE__ ), assert(0), 0 ) )
+	#else
+		#define ASSERT(x) ((void)(x))
+	#endif
 #endif
 
 // Pretty much the same as ASSERT() but stays in Release builds
diff --git a/src/LightingThread.cpp b/src/LightingThread.cpp
index 5459644af..dc19bf500 100644
--- a/src/LightingThread.cpp
+++ b/src/LightingThread.cpp
@@ -18,20 +18,17 @@
 class cReader :
 	public cChunkDataCallback
 {
-	virtual void BlockTypes(const BLOCKTYPE * a_Type) override
+	virtual void ChunkData(const cChunkData & a_ChunkBuffer) override
 	{
-		// ROW is a block of 16 Blocks, one whole row is copied at a time (hopefully the compiler will optimize that)
-		// C++ doesn't permit copying arrays, but arrays as a part of a struct is ok :)
-		typedef struct {BLOCKTYPE m_Row[16]; } ROW;
-		ROW * InputRows = (ROW *)a_Type;
-		ROW * OutputRows = (ROW *)m_BlockTypes;
+		BLOCKTYPE * OutputRows = m_BlockTypes;
 		int InputIdx = 0;
 		int OutputIdx = m_ReadingChunkX + m_ReadingChunkZ * cChunkDef::Width * 3;
 		for (int y = 0; y < cChunkDef::Height; y++)
 		{
 			for (int z = 0; z < cChunkDef::Width; z++)
 			{
-				OutputRows[OutputIdx] = InputRows[InputIdx++];
+				a_ChunkBuffer.CopyBlockTypes(OutputRows + OutputIdx * 16, InputIdx * 16, 16);
+				InputIdx++;
 				OutputIdx += 3;
 			}  // for z
 			// Skip into the next y-level in the 3x3 chunk blob; each level has cChunkDef::Width * 9 rows
diff --git a/src/MobProximityCounter.cpp b/src/MobProximityCounter.cpp
index 519757c2c..ce20bf56b 100644
--- a/src/MobProximityCounter.cpp
+++ b/src/MobProximityCounter.cpp
@@ -24,7 +24,7 @@ void cMobProximityCounter::CollectMob(cEntity& a_Monster, cChunk& a_Chunk, doubl
 		if (a_Distance < it->second.m_Distance)
 		{
 			it->second.m_Distance = a_Distance;
-			it->second.m_Chunk = a_Chunk;
+			it->second.m_Chunk = &a_Chunk;
 		}
 	}
 
@@ -36,7 +36,7 @@ void cMobProximityCounter::convertMaps()
 {
 	for(tMonsterToDistance::const_iterator itr = m_MonsterToDistance.begin(); itr != m_MonsterToDistance.end(); ++itr)
 	{
-		m_DistanceToMonster.insert(tDistanceToMonster::value_type(itr->second.m_Distance,sMonsterAndChunk(*itr->first,itr->second.m_Chunk)));
+		m_DistanceToMonster.insert(tDistanceToMonster::value_type(itr->second.m_Distance,sMonsterAndChunk(*itr->first,*itr->second.m_Chunk)));
 	}
 }
 
diff --git a/src/MobProximityCounter.h b/src/MobProximityCounter.h
index 8a67139aa..79429eb60 100644
--- a/src/MobProximityCounter.h
+++ b/src/MobProximityCounter.h
@@ -16,9 +16,9 @@ protected :
 	// structs used for later maps (see m_MonsterToDistance and m_DistanceToMonster)
 	struct sDistanceAndChunk
 	{
-		sDistanceAndChunk(double a_Distance, cChunk& a_Chunk) : m_Distance(a_Distance), m_Chunk(a_Chunk) {}
+		sDistanceAndChunk(double a_Distance, cChunk& a_Chunk) : m_Distance(a_Distance), m_Chunk(&a_Chunk) {}
 		double m_Distance;
-		cChunk& m_Chunk;
+		cChunk* m_Chunk;
 	};
 	struct sMonsterAndChunk
 	{
diff --git a/src/Simulator/FireSimulator.cpp b/src/Simulator/FireSimulator.cpp
index 4fbfffd43..311f8b4c4 100644
--- a/src/Simulator/FireSimulator.cpp
+++ b/src/Simulator/FireSimulator.cpp
@@ -95,8 +95,10 @@ void cFireSimulator::SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, cChun
 	int NumMSecs = (int)a_Dt;
 	for (cCoordWithIntList::iterator itr = Data.begin(); itr != Data.end();)
 	{
-		int idx = cChunkDef::MakeIndexNoCheck(itr->x, itr->y, itr->z);
-		BLOCKTYPE BlockType = a_Chunk->GetBlock(idx);
+		int x = itr->x;
+		int y = itr->y;
+		int z = itr->z;
+		BLOCKTYPE BlockType = a_Chunk->GetBlock(x,y,z);
 
 		if (!IsAllowedBlock(BlockType))
 		{
@@ -125,7 +127,7 @@ void cFireSimulator::SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, cChun
 			itr->x + a_ChunkX * cChunkDef::Width, itr->y, itr->z + a_ChunkZ * cChunkDef::Width
 		);
 		*/
-		NIBBLETYPE BlockMeta = a_Chunk->GetMeta(idx);
+		NIBBLETYPE BlockMeta = a_Chunk->GetMeta(x, y, z);
 		if (BlockMeta == 0x0f)
 		{
 			// The fire burnt out completely
@@ -140,7 +142,7 @@ void cFireSimulator::SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, cChun
 
 		if((itr->y > 0) && (!DoesBurnForever(a_Chunk->GetBlock(itr->x, itr->y - 1, itr->z))))
 		{
-			a_Chunk->SetMeta(idx, BlockMeta + 1);
+			a_Chunk->SetMeta(x, y, z, BlockMeta + 1);
 		}
 		itr->Data = GetBurnStepTime(a_Chunk, itr->x, itr->y, itr->z);  // TODO: Add some randomness into this
 	}  // for itr - Data[]
diff --git a/src/StringUtils.h b/src/StringUtils.h
index caad85aef..87b574a34 100644
--- a/src/StringUtils.h
+++ b/src/StringUtils.h
@@ -11,6 +11,9 @@
 
 
 
+#include <string>
+
+
 
 
 typedef std::string AString;
diff --git a/src/Vector3.h b/src/Vector3.h
index fed776018..5faac1457 100644
--- a/src/Vector3.h
+++ b/src/Vector3.h
@@ -5,6 +5,8 @@
 
 #define _USE_MATH_DEFINES // Enable non-standard math defines (MSVC)
 #include <math.h>
+#include <list>
+#include <vector>
 
 
 
diff --git a/src/WorldStorage/NBTChunkSerializer.cpp b/src/WorldStorage/NBTChunkSerializer.cpp
index 7b7cd3c7e..a3b0d57be 100644
--- a/src/WorldStorage/NBTChunkSerializer.cpp
+++ b/src/WorldStorage/NBTChunkSerializer.cpp
@@ -727,10 +727,9 @@ void cNBTChunkSerializer::AddMinecartChestContents(cMinecartWithChest * a_Mineca
 
 
 
-bool cNBTChunkSerializer::LightIsValid(bool a_IsLightValid)
+void cNBTChunkSerializer::LightIsValid(bool a_IsLightValid)
 {
 	m_IsLightValid = a_IsLightValid;
-	return a_IsLightValid;  // We want lighting only if it's valid, otherwise don't bother
 }
 
 
diff --git a/src/WorldStorage/NBTChunkSerializer.h b/src/WorldStorage/NBTChunkSerializer.h
index 51d104970..112afc27e 100644
--- a/src/WorldStorage/NBTChunkSerializer.h
+++ b/src/WorldStorage/NBTChunkSerializer.h
@@ -9,7 +9,7 @@
 
 #pragma once
 
-#include "../ChunkDef.h"
+#include "ChunkDataCallback.h"
 
 
 
@@ -121,7 +121,7 @@ protected:
 	void AddMinecartChestContents(cMinecartWithChest * a_Minecart);
 	
 	// cChunkDataSeparateCollector overrides:
-	virtual bool LightIsValid(bool a_IsLightValid) override;
+	virtual void LightIsValid(bool a_IsLightValid) override;
 	virtual void BiomeData(const cChunkDef::BiomeMap * a_BiomeMap) override;
 	virtual void Entity(cEntity * a_Entity) override;
 	virtual void BlockEntity(cBlockEntity * a_Entity) override;
diff --git a/src/WorldStorage/WSSCompact.cpp b/src/WorldStorage/WSSCompact.cpp
index 6d06b8fe3..7a113849a 100644
--- a/src/WorldStorage/WSSCompact.cpp
+++ b/src/WorldStorage/WSSCompact.cpp
@@ -107,15 +107,13 @@ void cJsonChunkSerializer::BlockEntity(cBlockEntity * a_BlockEntity)
 
 
 
-bool cJsonChunkSerializer::LightIsValid(bool a_IsLightValid)
+void cJsonChunkSerializer::LightIsValid(bool a_IsLightValid)
 {
-	if (!a_IsLightValid)
+	if (a_IsLightValid)
 	{
-		return false;
+		m_Root["IsLightValid"] = true;
+		m_HasJsonData = true;
 	}
-	m_Root["IsLightValid"] = true;
-	m_HasJsonData = true;
-	return true;
 }
 
 
diff --git a/src/WorldStorage/WSSCompact.h b/src/WorldStorage/WSSCompact.h
index 97e3b82f9..b148005f6 100644
--- a/src/WorldStorage/WSSCompact.h
+++ b/src/WorldStorage/WSSCompact.h
@@ -14,6 +14,7 @@
 #include "WorldStorage.h"
 #include "../Vector3.h"
 #include "json/json.h"
+#include "ChunkDataCallback.h"
 
 
 
@@ -21,7 +22,7 @@
 
 /// Helper class for serializing a chunk into Json
 class cJsonChunkSerializer :
-	public cChunkDataCollector
+	public cChunkDataArrayCollector
 {
 public:
 
@@ -42,7 +43,7 @@ protected:
 	// cChunkDataCollector overrides:
 	virtual void Entity       (cEntity *      a_Entity) override;
 	virtual void BlockEntity  (cBlockEntity * a_Entity) override;
-	virtual bool LightIsValid (bool a_IsLightValid) override;
+	virtual void LightIsValid (bool a_IsLightValid) override;
 } ;