path: root/source/WorldStorage/WSSAnvil.cpp

// WSSAnvil.cpp

// Implements the cWSSAnvil class representing the Anvil world storage scheme

#include "Globals.h"
#include "WSSAnvil.h"
#include "NBTChunkSerializer.h"
#include "../World.h"
#include "zlib.h"
#include "../BlockID.h"
#include "../BlockEntities/ChestEntity.h"
#include "../BlockEntities/DispenserEntity.h"
#include "../BlockEntities/DropperEntity.h"
#include "../BlockEntities/FurnaceEntity.h"
#include "../BlockEntities/HopperEntity.h"
#include "../BlockEntities/JukeboxEntity.h"
#include "../BlockEntities/NoteEntity.h"
#include "../BlockEntities/SignEntity.h"
#include "../Item.h"
#include "../ItemGrid.h"
#include "../StringCompression.h"
#include "../Entities/Entity.h"
#include "../OSSupport/MakeDir.h"
#include "FastNBT.h"
#include "../Entities/FallingBlock.h"
#include "../Entities/Minecart.h"
#include "../Mobs/Monster.h"
#include "../Entities/Pickup.h"





/** If defined, the BlockSkyLight values will be copied over to BlockLight upon chunk saving,
thus making skylight visible in Minutor's Lighting mode
*/
// #define DEBUG_SKYLIGHT

/** Maximum number of MCA files that are cached in memory. 
Since only the header is actually in the memory, this number can be high, but still, each file means an OS FS handle.
*/
#define MAX_MCA_FILES 32

/// The maximum size of an inflated chunk; raw chunk data is 192 KiB, allow 64 KiB more of entities
#define CHUNK_INFLATE_MAX 256 KiB






///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// cWSSAnvil:

cWSSAnvil::cWSSAnvil(cWorld * a_World) :
	super(a_World)
{
	// Create a level.dat file for mapping tools, if it doesn't already exist:
	AString fnam;
	Printf(fnam, "%s/level.dat", a_World->GetName().c_str());
	if (!cFile::Exists(fnam))
	{
		cFastNBTWriter Writer;
		Writer.BeginCompound("");
		Writer.AddInt("SpawnX", (int)(a_World->GetSpawnX()));
		Writer.AddInt("SpawnY", (int)(a_World->GetSpawnY()));
		Writer.AddInt("SpawnZ", (int)(a_World->GetSpawnZ()));
		Writer.EndCompound();
		Writer.Finish();
		
		#ifdef _DEBUG
		cParsedNBT TestParse(Writer.GetResult().data(), Writer.GetResult().size());
		ASSERT(TestParse.IsValid());
		#endif  // _DEBUG
		
		gzFile gz = gzopen((FILE_IO_PREFIX + fnam).c_str(), "wb");
		if (gz != NULL)
		{
			gzwrite(gz, Writer.GetResult().data(), Writer.GetResult().size());
		}
		gzclose(gz);
	}
}





cWSSAnvil::~cWSSAnvil()
{
	cCSLock Lock(m_CS);
	for (cMCAFiles::iterator itr = m_Files.begin(); itr != m_Files.end(); ++itr)
	{
		delete *itr;
	}  // for itr - m_Files[]
}





bool cWSSAnvil::LoadChunk(const cChunkCoords & a_Chunk)
{
	AString ChunkData;
	if (!GetChunkData(a_Chunk, ChunkData))
	{
		// The reason for failure is already printed in GetChunkData()
		return false;
	}
	
	return LoadChunkFromData(a_Chunk, ChunkData);
}





bool cWSSAnvil::SaveChunk(const cChunkCoords & a_Chunk)
{
	AString ChunkData;
	if (!SaveChunkToData(a_Chunk, ChunkData))
	{
		LOGWARNING("Cannot serialize chunk [%d, %d] into data", a_Chunk.m_ChunkX, a_Chunk.m_ChunkZ);
		return false;
	}
	if (!SetChunkData(a_Chunk, ChunkData))
	{
		LOGWARNING("Cannot store chunk [%d, %d] data", a_Chunk.m_ChunkX, a_Chunk.m_ChunkZ);
		return false;
	}
	
	// Everything successful
	return true;
}





bool cWSSAnvil::GetChunkData(const cChunkCoords & a_Chunk, AString & a_Data)
{
	cCSLock Lock(m_CS);
	cMCAFile * File = LoadMCAFile(a_Chunk);
	if (File == NULL)
	{
		return false;
	}
	return File->GetChunkData(a_Chunk, a_Data);
}





bool cWSSAnvil::SetChunkData(const cChunkCoords & a_Chunk, const AString & a_Data)
{
	cCSLock Lock(m_CS);
	cMCAFile * File = LoadMCAFile(a_Chunk);
	if (File == NULL)
	{
		return false;
	}
	return File->SetChunkData(a_Chunk, a_Data);
}





cWSSAnvil::cMCAFile * cWSSAnvil::LoadMCAFile(const cChunkCoords & a_Chunk)
{
	// ASSUME m_CS is locked
	ASSERT(m_CS.IsLocked());

	const int RegionX = FAST_FLOOR_DIV(a_Chunk.m_ChunkX, 32);
	const int RegionZ = FAST_FLOOR_DIV(a_Chunk.m_ChunkZ, 32);
	ASSERT(a_Chunk.m_ChunkX - RegionX * 32 >= 0);
	ASSERT(a_Chunk.m_ChunkZ - RegionZ * 32 >= 0);
	ASSERT(a_Chunk.m_ChunkX - RegionX * 32 < 32);
	ASSERT(a_Chunk.m_ChunkZ - RegionZ * 32 < 32);
	
	// Is it already cached?
	for (cMCAFiles::iterator itr = m_Files.begin(); itr != m_Files.end(); ++itr)
	{
		if (((*itr) != NULL) && ((*itr)->GetRegionX() == RegionX) && ((*itr)->GetRegionZ() == RegionZ))
		{
			// Move the file to front and return it:
			cMCAFile * f = *itr;
			if (itr != m_Files.begin())
			{
				m_Files.erase(itr);
				m_Files.push_front(f);
			}
			return f;
		}
	}
	
	// Load it anew:
	AString FileName;
	Printf(FileName, "%s/region", m_World->GetName().c_str());
	cMakeDir::MakeDir(FileName);
	AppendPrintf(FileName, "/r.%d.%d.mca", RegionX, RegionZ);
	cMCAFile * f = new cMCAFile(FileName, RegionX, RegionZ);
	if (f == NULL)
	{
		return NULL;
	}
	m_Files.push_front(f);
	
	// If there are too many MCA files cached, delete the last one used:
	if (m_Files.size() > MAX_MCA_FILES)
	{
		delete m_Files.back();
		m_Files.pop_back();
	}
	return f;
}





bool cWSSAnvil::LoadChunkFromData(const cChunkCoords & a_Chunk, const AString & a_Data)
{
	// Decompress the data:
	char Uncompressed[CHUNK_INFLATE_MAX];
	z_stream strm;
	strm.zalloc = (alloc_func)NULL;
	strm.zfree = (free_func)NULL;
	strm.opaque = NULL;
	inflateInit(&strm);
	strm.next_out  = (Bytef *)Uncompressed;
	strm.avail_out = sizeof(Uncompressed);
	strm.next_in   = (Bytef *)a_Data.data();
	strm.avail_in  = a_Data.size();
	int res = inflate(&strm, Z_FINISH);
	inflateEnd(&strm);
	if (res != Z_STREAM_END)
	{
		return false;
	}
	
	// Parse the NBT data:
	cParsedNBT NBT(Uncompressed, strm.total_out);
	if (!NBT.IsValid())
	{
		// NBT Parsing failed
		return false;
	}

	// Load the data from NBT:
	return LoadChunkFromNBT(a_Chunk, NBT);
}





bool cWSSAnvil::SaveChunkToData(const cChunkCoords & a_Chunk, AString & a_Data)
{
	cFastNBTWriter Writer;
	if (!SaveChunkToNBT(a_Chunk, Writer))
	{
		LOGWARNING("Cannot save chunk [%d, %d] to NBT", a_Chunk.m_ChunkX, a_Chunk.m_ChunkZ);
		return false;
	}
	Writer.Finish();
	
	CompressString(Writer.GetResult().data(), Writer.GetResult().size(), a_Data);
	return true;
}





bool cWSSAnvil::LoadChunkFromNBT(const cChunkCoords & a_Chunk, const cParsedNBT & a_NBT)
{
	// The data arrays, in MCA-native y/z/x ordering (will be reordered for the final chunk data)
	cChunkDef::BlockTypes   BlockTypes;
	cChunkDef::BlockNibbles MetaData;
	cChunkDef::BlockNibbles BlockLight;
	cChunkDef::BlockNibbles SkyLight;
	
	memset(BlockTypes, E_BLOCK_AIR, sizeof(BlockTypes));
	memset(MetaData,   0,           sizeof(MetaData));
	memset(SkyLight,   0xff,        sizeof(SkyLight));  // By default, data not present in the NBT means air, which means full skylight
	memset(BlockLight, 0x00,        sizeof(BlockLight));
	
	// Load the blockdata, blocklight and skylight:
	int Level = a_NBT.FindChildByName(0, "Level");
	if (Level < 0)
	{
		return false;
	}
	int Sections = a_NBT.FindChildByName(Level, "Sections");
	if ((Sections < 0) || (a_NBT.GetType(Sections) != TAG_List) || (a_NBT.GetChildrenType(Sections) != TAG_Compound))
	{
		return false;
	}
	for (int Child = a_NBT.GetFirstChild(Sections); Child >= 0; Child = a_NBT.GetNextSibling(Child))
	{
		int y = 0;
		int SectionY = a_NBT.FindChildByName(Child, "Y");
		if ((SectionY < 0) || (a_NBT.GetType(SectionY) != TAG_Byte))
		{
			continue;
		}
		y = a_NBT.GetByte(SectionY);
		if ((y < 0) || (y > 15))
		{
			continue;
		}
		CopyNBTData(a_NBT, Child, "Blocks",     (char *)&(BlockTypes[y * 4096]), 4096);
		CopyNBTData(a_NBT, Child, "Data",       (char *)&(MetaData[y   * 2048]), 2048);
		CopyNBTData(a_NBT, Child, "SkyLight",   (char *)&(SkyLight[y   * 2048]), 2048);
		CopyNBTData(a_NBT, Child, "BlockLight", (char *)&(BlockLight[y * 2048]), 2048);
	}  // for itr - LevelSections[]
	
	// Load the biomes from NBT, if present and valid. First try MCS-style, then Vanilla-style:
	cChunkDef::BiomeMap BiomeMap;
	cChunkDef::BiomeMap * Biomes = LoadBiomeMapFromNBT(&BiomeMap, a_NBT, a_NBT.FindChildByName(Level, "MCSBiomes"));
	if (Biomes == NULL)
	{
		// MCS-style biomes not available, load vanilla-style:
		Biomes = LoadVanillaBiomeMapFromNBT(&BiomeMap, a_NBT, a_NBT.FindChildByName(Level, "Biomes"));
	}
	
	// Load the entities from NBT:
	cEntityList      Entities;
	cBlockEntityList BlockEntities;
	LoadEntitiesFromNBT     (Entities,      a_NBT, a_NBT.FindChildByName(Level, "Entities"));
	LoadBlockEntitiesFromNBT(BlockEntities, a_NBT, a_NBT.FindChildByName(Level, "TileEntities"), BlockTypes, MetaData);
	
	bool IsLightValid = (a_NBT.FindChildByName(Level, "MCSIsLightValid") > 0);
	
	/*
	// Uncomment this block for really cool stuff :)
	// DEBUG magic: Invert the underground, so that we can see the MC generator in action :)
	bool ShouldInvert[cChunkDef::Width * cChunkDef::Width];
	memset(ShouldInvert, 0, sizeof(ShouldInvert));
	for (int y = cChunkDef::Height - 1; y >= 0; y--)
	{
		for (int x = 0; x < cChunkDef::Width; x++) for (int z = 0; z < cChunkDef::Width; z++)
		{
			int Index = cChunkDef::MakeIndexNoCheck(x, y, z);
			if (ShouldInvert[x + cChunkDef::Width * z])
			{
				BlockTypes[Index] = (BlockTypes[Index] == E_BLOCK_AIR) ? E_BLOCK_STONE : E_BLOCK_AIR;
			}
			else
			{
				switch (BlockTypes[Index])
				{
					case E_BLOCK_AIR:
					case E_BLOCK_LEAVES:
					{
						// nothing needed
						break;
					}
					default:
					{
						ShouldInvert[x + cChunkDef::Width * z] = true;
					}
				}
				BlockTypes[Index] = E_BLOCK_AIR;
			}
		}
	}  // for y
	//*/
	
	m_World->SetChunkData(
		a_Chunk.m_ChunkX, a_Chunk.m_ChunkZ,
		BlockTypes, MetaData, 
		IsLightValid ? BlockLight : NULL,
		IsLightValid ? SkyLight : NULL,
		NULL, Biomes,
		Entities, BlockEntities,
		false
	);
	return true;
}




void cWSSAnvil::CopyNBTData(const cParsedNBT & a_NBT, int a_Tag, const AString & a_ChildName, char * a_Destination, int a_Length)
{
	int Child = a_NBT.FindChildByName(a_Tag, a_ChildName);
	if ((Child >= 0) && (a_NBT.GetType(Child) == TAG_ByteArray) && (a_NBT.GetDataLength(Child) == a_Length))
	{
		memcpy(a_Destination, a_NBT.GetData(Child), a_Length);
	}
}





bool cWSSAnvil::SaveChunkToNBT(const cChunkCoords & a_Chunk, cFastNBTWriter & a_Writer)
{
	a_Writer.BeginCompound("Level");
	a_Writer.AddInt("xPos", a_Chunk.m_ChunkX);
	a_Writer.AddInt("zPos", a_Chunk.m_ChunkZ);
	cNBTChunkSerializer Serializer(a_Writer);
	if (!m_World->GetChunkData(a_Chunk.m_ChunkX, a_Chunk.m_ChunkZ, Serializer))
	{
		LOGWARNING("Cannot get chunk [%d, %d] data for NBT saving", a_Chunk.m_ChunkX, a_Chunk.m_ChunkZ);
		return false;
	}
	Serializer.Finish();  // Close NBT tags
	
	// Save biomes, both MCS (IntArray) and MC-vanilla (ByteArray):
	if (Serializer.m_BiomesAreValid)
	{
		a_Writer.AddByteArray("Biomes",    (const char *)(Serializer.m_VanillaBiomes), ARRAYCOUNT(Serializer.m_VanillaBiomes));
		a_Writer.AddIntArray ("MCSBiomes", (const int *)(Serializer.m_Biomes),         ARRAYCOUNT(Serializer.m_Biomes));
	}
	
	// Save blockdata:
	a_Writer.BeginList("Sections", TAG_Compound);
	int SliceSizeBlock  = cChunkDef::Width * cChunkDef::Width * 16;
	int SliceSizeNibble = SliceSizeBlock / 2;
	const char * BlockTypes    = (const char *)(Serializer.m_BlockTypes);
	const char * BlockMetas    = (const char *)(Serializer.m_BlockMetas);
	#ifdef DEBUG_SKYLIGHT
		const char * BlockLight  = (const char *)(Serializer.m_BlockSkyLight);
	#else
		const char * BlockLight  = (const char *)(Serializer.m_BlockLight);
	#endif 
	const char * BlockSkyLight = (const char *)(Serializer.m_BlockSkyLight);
	for (int Y = 0; Y < 16; Y++)
	{
		a_Writer.BeginCompound("");
		a_Writer.AddByteArray("Blocks",     BlockTypes    + Y * SliceSizeBlock,  SliceSizeBlock);
		a_Writer.AddByteArray("Data",       BlockMetas    + Y * SliceSizeNibble, SliceSizeNibble);
		a_Writer.AddByteArray("SkyLight",   BlockSkyLight + Y * SliceSizeNibble, SliceSizeNibble);
		a_Writer.AddByteArray("BlockLight", BlockLight    + Y * SliceSizeNibble, SliceSizeNibble);
		a_Writer.AddByte("Y", (unsigned char)Y);
		a_Writer.EndCompound();
	}
	a_Writer.EndList();  // "Sections"
	
	// Store the information that the lighting is valid. 
	// For compatibility reason, the default is "invalid" (missing) - this means older data is re-lighted upon loading.
	if (Serializer.IsLightValid())
	{
		a_Writer.AddByte("MCSIsLightValid", 1);
	}
	
	a_Writer.EndCompound();  // "Level"
	return true;
}





cChunkDef::BiomeMap * cWSSAnvil::LoadVanillaBiomeMapFromNBT(cChunkDef::BiomeMap * a_BiomeMap, const cParsedNBT & a_NBT, int a_TagIdx)
{
	if ((a_TagIdx < 0) || (a_NBT.GetType(a_TagIdx) != TAG_ByteArray))
	{
		return NULL;
	}
	if (a_NBT.GetDataLength(a_TagIdx) != 16 * 16)
	{
		// The biomes stored don't match in size
		return NULL;
	}
	const unsigned char * VanillaBiomeData = (const unsigned char *)(a_NBT.GetData(a_TagIdx));
	for (int i = 0; i < ARRAYCOUNT(*a_BiomeMap); i++)
	{
		if ((VanillaBiomeData)[i] == 0xff)
		{
			// Unassigned biomes
			return NULL;
		}
		(*a_BiomeMap)[i] = (EMCSBiome)(VanillaBiomeData[i]);
	}
	return a_BiomeMap;
}





cChunkDef::BiomeMap * cWSSAnvil::LoadBiomeMapFromNBT(cChunkDef::BiomeMap * a_BiomeMap, const cParsedNBT & a_NBT, int a_TagIdx)
{
	if ((a_TagIdx < 0) || (a_NBT.GetType(a_TagIdx) != TAG_IntArray))
	{
		return NULL;
	}
	if (a_NBT.GetDataLength(a_TagIdx) != sizeof(*a_BiomeMap))
	{
		// The biomes stored don't match in size
		return NULL;
	}
	const int * BiomeData = (const int *)(a_NBT.GetData(a_TagIdx));
	for (int i = 0; i < ARRAYCOUNT(*a_BiomeMap); i++)
	{
		(*a_BiomeMap)[i] = (EMCSBiome)(ntohl(BiomeData[i]));
		if ((*a_BiomeMap)[i] == 0xff)
		{
			// Unassigned biomes
			return NULL;
		}
	}
	return a_BiomeMap;
}





void cWSSAnvil::LoadEntitiesFromNBT(cEntityList & a_Entities, const cParsedNBT & a_NBT, int a_TagIdx)
{
	if ((a_TagIdx < 0) || (a_NBT.GetType(a_TagIdx) != TAG_List))
	{
		return;
	}
	
	for (int Child = a_NBT.GetFirstChild(a_TagIdx); Child != -1; Child = a_NBT.GetNextSibling(Child))
	{
		if (a_NBT.GetType(Child) != TAG_Compound)
		{
			continue;
		}
		int sID = a_NBT.FindChildByName(Child, "id");
		if (sID < 0)
		{
			continue;
		}
		LoadEntityFromNBT(a_Entities, a_NBT, Child, a_NBT.GetData(sID), a_NBT.GetDataLength(sID));
	}  // for Child - a_NBT[]
}





void cWSSAnvil::LoadBlockEntitiesFromNBT(cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx, BLOCKTYPE * a_BlockTypes, NIBBLETYPE * a_BlockMetas)
{
	if ((a_TagIdx < 0) || (a_NBT.GetType(a_TagIdx) != TAG_List))
	{
		return;
	}
	
	for (int Child = a_NBT.GetFirstChild(a_TagIdx); Child != -1; Child = a_NBT.GetNextSibling(Child))
	{
		if (a_NBT.GetType(Child) != TAG_Compound)
		{
			continue;
		}
		int sID = a_NBT.FindChildByName(Child, "id");
		if (sID < 0)
		{
			continue;
		}
		if (strncmp(a_NBT.GetData(sID), "Chest", a_NBT.GetDataLength(sID)) == 0)
		{
			LoadChestFromNBT(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), "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), "Trap", a_NBT.GetDataLength(sID)) == 0)
		{
			LoadDispenserFromNBT(a_BlockEntities, a_NBT, Child);
		}
		// TODO: Other block entities
	}  // for Child - tag children
}





bool cWSSAnvil::LoadItemFromNBT(cItem & a_Item, const cParsedNBT & a_NBT, int a_TagIdx)
{
	int ID = a_NBT.FindChildByName(a_TagIdx, "id");
	if ((ID < 0) || (a_NBT.GetType(ID) != TAG_Short))
	{
		return false;
	}
	a_Item.m_ItemType = (ENUM_ITEM_ID)(a_NBT.GetShort(ID));
	
	int Damage = a_NBT.FindChildByName(a_TagIdx, "Damage");
	if ((Damage < 0) || (a_NBT.GetType(Damage) != TAG_Short))
	{
		return false;
	}
	a_Item.m_ItemDamage = a_NBT.GetShort(Damage);
	
	int Count = a_NBT.FindChildByName(a_TagIdx, "Count");
	if ((Count < 0) || (a_NBT.GetType(Count) != TAG_Byte))
	{
		return false;
	}
	a_Item.m_ItemCount = a_NBT.GetByte(Count);
	
	// Find the "tag" tag, used for enchantments and other extra data
	int TagTag = a_NBT.FindChildByName(a_TagIdx, "tag");
	if (TagTag <= 0)
	{
		// No extra data
		return true;
	}

	// Load enchantments:
	const char * EnchName = (a_Item.m_ItemType == E_ITEM_BOOK) ? "StoredEnchantments" : "ench";
	int EnchTag = a_NBT.FindChildByName(TagTag, EnchName);
	if (EnchTag > 0)
	{
		a_Item.m_Enchantments.ParseFromNBT(a_NBT, EnchTag);
	}
	
	return true;
}





void cWSSAnvil::LoadItemGridFromNBT(cItemGrid & a_ItemGrid, const cParsedNBT & a_NBT, int a_ItemsTagIdx, int a_SlotOffset)
{
	int NumSlots = a_ItemGrid.GetNumSlots();
	for (int Child = a_NBT.GetFirstChild(a_ItemsTagIdx); Child != -1; Child = a_NBT.GetNextSibling(Child))
	{
		int SlotTag = a_NBT.FindChildByName(Child, "Slot");
		if ((SlotTag < 0) || (a_NBT.GetType(SlotTag) != TAG_Byte))
		{
			continue;
		}
		int SlotNum = (int)(a_NBT.GetByte(SlotTag)) - a_SlotOffset;
		if ((SlotNum < 0) || (SlotNum >= NumSlots))
		{
			// SlotNum outside of the range
			continue;
		}
		cItem Item;
		if (LoadItemFromNBT(Item, a_NBT, Child))
		{
			a_ItemGrid.SetSlot(SlotNum, Item);
		}
	}  // for itr - ItemDefs[]
}





void cWSSAnvil::LoadChestFromNBT(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;
	}
	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
	}
	std::auto_ptr<cChestEntity> Chest(new cChestEntity(x, y, z, m_World));
	LoadItemGridFromNBT(Chest->GetContents(), a_NBT, Items);
	a_BlockEntities.push_back(Chest.release());
}





void cWSSAnvil::LoadDispenserFromNBT(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;
	}
	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
	}
	std::auto_ptr<cDispenserEntity> Dispenser(new cDispenserEntity(x, y, z, m_World));
	LoadItemGridFromNBT(Dispenser->GetContents(), a_NBT, Items);
	a_BlockEntities.push_back(Dispenser.release());
}





void cWSSAnvil::LoadDropperFromNBT(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;
	}
	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
	}
	std::auto_ptr<cDropperEntity> Dropper(new cDropperEntity(x, y, z, m_World));
	LoadItemGridFromNBT(Dropper->GetContents(), a_NBT, Items);
	a_BlockEntities.push_back(Dropper.release());
}





void cWSSAnvil::LoadFurnaceFromNBT(cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx, BLOCKTYPE * a_BlockTypes, NIBBLETYPE * a_BlockMetas)
{
	ASSERT(a_NBT.GetType(a_TagIdx) == TAG_Compound);
	int x, y, z;
	if (!GetBlockEntityNBTPos(a_NBT, a_TagIdx, x, y, z))
	{
		return;
	}
	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
	}
	
	// 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));
	
	// Load slots:
	for (int Child = a_NBT.GetFirstChild(Items); Child != -1; Child = a_NBT.GetNextSibling(Child))
	{
		int Slot = a_NBT.FindChildByName(Child, "Slot");
		if ((Slot < 0) || (a_NBT.GetType(Slot) != TAG_Byte))
		{
			continue;
		}
		cItem Item;
		if (LoadItemFromNBT(Item, a_NBT, Child))
		{
			Furnace->SetSlot(a_NBT.GetByte(Slot), Item);
		}
	}  // for itr - ItemDefs[]
	
	// Load burn time:
	int BurnTime = a_NBT.FindChildByName(a_TagIdx, "BurnTime");
	if (BurnTime >= 0)
	{
		Int16 bt = a_NBT.GetShort(BurnTime);
		// Anvil doesn't store the time that the fuel can burn. We simply "reset" the current value to be the 100%
		Furnace->SetBurnTimes(bt, 0);
	}
	
	// Load cook time:
	int CookTime = a_NBT.FindChildByName(a_TagIdx, "CookTime");
	if (CookTime >= 0)
	{
		Int16 ct = a_NBT.GetShort(CookTime);
		// Anvil doesn't store the time that an item takes to cook. We simply use the default - 10 seconds (200 ticks)
		Furnace->SetCookTimes(200, ct);
	}
	
	// Restart cooking:
	Furnace->ContinueCooking();
	a_BlockEntities.push_back(Furnace.release());
}





void cWSSAnvil::LoadHopperFromNBT(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;
	}
	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
	}
	std::auto_ptr<cHopperEntity> Hopper(new cHopperEntity(x, y, z, m_World));
	LoadItemGridFromNBT(Hopper->GetContents(), a_NBT, Items);
	a_BlockEntities.push_back(Hopper.release());
}





void cWSSAnvil::LoadJukeboxFromNBT(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<cJukeboxEntity> Jukebox(new cJukeboxEntity(x, y, z, 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());
}





void cWSSAnvil::LoadSignFromNBT(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<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));
	}

	currentLine = a_NBT.FindChildByName(a_TagIdx, "Text2");
	if (currentLine >= 0)
	{
		Sign->SetLine(1, a_NBT.GetString(currentLine));
	}

	currentLine = a_NBT.FindChildByName(a_TagIdx, "Text3");
	if (currentLine >= 0)
	{
		Sign->SetLine(2, a_NBT.GetString(currentLine));
	}

	currentLine = a_NBT.FindChildByName(a_TagIdx, "Text4");
	if (currentLine >= 0)
	{
		Sign->SetLine(3, a_NBT.GetString(currentLine));
	}

	a_BlockEntities.push_back(Sign.release());
}





void cWSSAnvil::LoadEntityFromNBT(cEntityList & a_Entities, const cParsedNBT & a_NBT, int a_EntityTagIdx, const char * a_IDTag, int a_IDTagLength)
{
	if (strncmp(a_IDTag, "FallingBlock", a_IDTagLength) == 0)
	{
		LoadFallingBlockFromNBT(a_Entities, a_NBT, a_EntityTagIdx);
	}
	else if (strncmp(a_IDTag, "Minecart", a_IDTagLength) == 0)
	{
		// It is a minecart, old style, find out the type:
		int TypeTag = a_NBT.FindChildByName(a_EntityTagIdx, "Type");
		if ((TypeTag < 0) || (a_NBT.GetType(TypeTag) != TAG_Int))
		{
			return;
		}
		switch (a_NBT.GetInt(TypeTag))
		{
			case 0: LoadMinecartRFromNBT(a_Entities, a_NBT, a_EntityTagIdx); break;  // Rideable minecart
			case 1: LoadMinecartCFromNBT(a_Entities, a_NBT, a_EntityTagIdx); break;  // Minecart with chest
			case 2: LoadMinecartFFromNBT(a_Entities, a_NBT, a_EntityTagIdx); break;  // Minecart with furnace
			case 3: LoadMinecartTFromNBT(a_Entities, a_NBT, a_EntityTagIdx); break;  // Minecart with TNT
			case 4: LoadMinecartHFromNBT(a_Entities, a_NBT, a_EntityTagIdx); break;  // Minecart with Hopper
		}
	}
	else if (strncmp(a_IDTag, "MinecartRideable", a_IDTagLength) == 0)
	{
		LoadMinecartRFromNBT(a_Entities, a_NBT, a_EntityTagIdx);
	}
	else if (strncmp(a_IDTag, "MinecartChest", a_IDTagLength) == 0)
	{
		LoadMinecartCFromNBT(a_Entities, a_NBT, a_EntityTagIdx);
	}
	else if (strncmp(a_IDTag, "MinecartFurnace", a_IDTagLength) == 0)
	{
		LoadMinecartFFromNBT(a_Entities, a_NBT, a_EntityTagIdx);
	}
	else if (strncmp(a_IDTag, "MinecartTNT", a_IDTagLength) == 0)
	{
		LoadMinecartTFromNBT(a_Entities, a_NBT, a_EntityTagIdx);
	}
	else if (strncmp(a_IDTag, "MinecartHopper", a_IDTagLength) == 0)
	{
		LoadMinecartHFromNBT(a_Entities, a_NBT, a_EntityTagIdx);
	}
	if (strncmp(a_IDTag, "Item", a_IDTagLength) == 0)
	{
		LoadPickupFromNBT(a_Entities, a_NBT, a_EntityTagIdx);
	}
	// TODO: other entities
}





void cWSSAnvil::LoadFallingBlockFromNBT(cEntityList & a_Entities, const cParsedNBT & a_NBT, int a_TagIdx)
{
	// TODO
}





void cWSSAnvil::LoadMinecartRFromNBT(cEntityList & a_Entities, const cParsedNBT & a_NBT, int a_TagIdx)
{
	std::auto_ptr<cEmptyMinecart> Minecart(new cEmptyMinecart(0, 0, 0));
	if (!LoadEntityBaseFromNBT(*Minecart.get(), a_NBT, a_TagIdx))
	{
		return;
	}
	a_Entities.push_back(Minecart.release());
}





void cWSSAnvil::LoadMinecartCFromNBT(cEntityList & a_Entities, const cParsedNBT & a_NBT, int a_TagIdx)
{
	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
	}
	std::auto_ptr<cMinecartWithChest> Minecart(new cMinecartWithChest(0, 0, 0));
	if (!LoadEntityBaseFromNBT(*Minecart.get(), a_NBT, a_TagIdx))
	{
		return;
	}
	for (int Child = a_NBT.GetFirstChild(Items); Child != -1; Child = a_NBT.GetNextSibling(Child))
	{
		int Slot = a_NBT.FindChildByName(Child, "Slot");
		if ((Slot < 0) || (a_NBT.GetType(Slot) != TAG_Byte))
		{
			continue;
		}
		cItem Item;
		if (LoadItemFromNBT(Item, a_NBT, Child))
		{
			Minecart->SetSlot(a_NBT.GetByte(Slot), Item);
		}
	}  // for itr - ItemDefs[]
	a_Entities.push_back(Minecart.release());
}





void cWSSAnvil::LoadMinecartFFromNBT(cEntityList & a_Entities, const cParsedNBT & a_NBT, int a_TagIdx)
{
	std::auto_ptr<cMinecartWithFurnace> Minecart(new cMinecartWithFurnace(0, 0, 0));
	if (!LoadEntityBaseFromNBT(*Minecart.get(), a_NBT, a_TagIdx))
	{
		return;
	}
	
	// TODO: Load the Push and Fuel tags
	
	a_Entities.push_back(Minecart.release());
}





void cWSSAnvil::LoadMinecartTFromNBT(cEntityList & a_Entities, const cParsedNBT & a_NBT, int a_TagIdx)
{
	std::auto_ptr<cMinecartWithTNT> Minecart(new cMinecartWithTNT(0, 0, 0));
	if (!LoadEntityBaseFromNBT(*Minecart.get(), a_NBT, a_TagIdx))
	{
		return;
	}
	
	//TODO: Everything to do with TNT carts

	a_Entities.push_back(Minecart.release());
}





void cWSSAnvil::LoadMinecartHFromNBT(cEntityList & a_Entities, const cParsedNBT & a_NBT, int a_TagIdx)
{
	std::auto_ptr<cMinecartWithHopper> Minecart(new cMinecartWithHopper(0, 0, 0));
	if (!LoadEntityBaseFromNBT(*Minecart.get(), a_NBT, a_TagIdx))
	{
		return;
	}
	
	//TODO: Everything to do with hopper carts

	a_Entities.push_back(Minecart.release());
}





void cWSSAnvil::LoadPickupFromNBT(cEntityList & a_Entities, const cParsedNBT & a_NBT, int a_TagIdx)
{
	int ItemTag = a_NBT.FindChildByName(a_TagIdx, "Item");
	if ((ItemTag < 0) || (a_NBT.GetType(ItemTag) != TAG_Compound))
	{
		return;
	}
	cItem Item;
	if (!LoadItemFromNBT(Item, a_NBT, ItemTag))
	{
		return;
	}
	std::auto_ptr<cPickup> Pickup(new cPickup(0, 0, 0, Item));
	if (!LoadEntityBaseFromNBT(*Pickup.get(), a_NBT, a_TagIdx))
	{
		return;
	}
	a_Entities.push_back(Pickup.release());
}





bool cWSSAnvil::LoadEntityBaseFromNBT(cEntity & a_Entity, const cParsedNBT & a_NBT, int a_TagIdx)
{
	double Pos[3];
	if (!LoadDoublesListFromNBT(Pos, 3, a_NBT, a_NBT.FindChildByName(a_TagIdx, "Pos")))
	{
		return false;
	}
	a_Entity.SetPosition(Pos[0], Pos[1], Pos[2]);
	
	double Speed[3];
	if (!LoadDoublesListFromNBT(Speed, 3, a_NBT, a_NBT.FindChildByName(a_TagIdx, "Motion")))
	{
		return false;
	}
	a_Entity.SetSpeed(Speed[0], Speed[1], Speed[2]);
	
	double Rotation[3];
	if (!LoadDoublesListFromNBT(Rotation, 2, a_NBT, a_NBT.FindChildByName(a_TagIdx, "Rotation")))
	{
		return false;
	}
	a_Entity.SetRotation(Rotation[0]);
	a_Entity.SetRoll    (Rotation[1]);
	
	return true;
}





bool cWSSAnvil::LoadDoublesListFromNBT(double * a_Doubles, int a_NumDoubles, const cParsedNBT & a_NBT, int a_TagIdx)
{
	if ((a_TagIdx < 0) || (a_NBT.GetType(a_TagIdx) != TAG_List) || (a_NBT.GetChildrenType(a_TagIdx) != TAG_Double))
	{
		return false;
	}
	int idx = 0;
	for (int Tag = a_NBT.GetFirstChild(a_TagIdx); (Tag > 0) && (idx < a_NumDoubles); Tag = a_NBT.GetNextSibling(Tag), ++idx)
	{
		a_Doubles[idx] = a_NBT.GetDouble(Tag);
	}  // for Tag - PosTag[]
	return (idx == a_NumDoubles);  // Did we read enough doubles?
}





bool cWSSAnvil::GetBlockEntityNBTPos(const cParsedNBT & a_NBT, int a_TagIdx, int & a_X, int & a_Y, int & a_Z)
{
	int x = a_NBT.FindChildByName(a_TagIdx, "x");
	if ((x < 0) || (a_NBT.GetType(x) != TAG_Int))
	{
		return false;
	}
	int y = a_NBT.FindChildByName(a_TagIdx, "y");
	if ((y < 0) || (a_NBT.GetType(y) != TAG_Int))
	{
		return false;
	}
	int z = a_NBT.FindChildByName(a_TagIdx, "z");
	if ((z < 0) || (a_NBT.GetType(z) != TAG_Int))
	{
		return false;
	}
	a_X = a_NBT.GetInt(x);
	a_Y = a_NBT.GetInt(y);
	a_Z = a_NBT.GetInt(z);
	return true;
}





///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// cWSSAnvil::cMCAFile:

cWSSAnvil::cMCAFile::cMCAFile(const AString & a_FileName, int a_RegionX, int a_RegionZ) :
	m_RegionX(a_RegionX),
	m_RegionZ(a_RegionZ),
	m_FileName(a_FileName)
{
}





bool cWSSAnvil::cMCAFile::OpenFile(bool a_IsForReading)
{
	if (m_File.IsOpen())
	{
		// Already open
		return true;
	}
	
	if (a_IsForReading)
	{
		if (!cFile::Exists(m_FileName))
		{
			// We want to read and the file doesn't exist. Fail.
			return false;
		}
	}
	
	if (!m_File.Open(m_FileName, cFile::fmReadWrite))
	{
		// The file failed to open
		return false;
	}
	
	// Load the header:
	if (m_File.Read(m_Header, sizeof(m_Header)) != sizeof(m_Header))
	{
		// Cannot read the header - perhaps the file has just been created?
		// Try writing a NULL header (both chunk offsets and timestamps):
		memset(m_Header, 0, sizeof(m_Header));
		if (
			(m_File.Write(m_Header, sizeof(m_Header)) != sizeof(m_Header)) ||  // Real header - chunk offsets
			(m_File.Write(m_Header, sizeof(m_Header)) != sizeof(m_Header))     // Bogus data for the chunk timestamps
		)
		{
			LOGWARNING("Cannot process MCA header in file \"%s\", chunks in that file will be lost", m_FileName.c_str());
			m_File.Close();
			return false;
		}
	}
	return true;
}





bool cWSSAnvil::cMCAFile::GetChunkData(const cChunkCoords & a_Chunk, AString & a_Data)
{
	if (!OpenFile(true))
	{
		return false;
	}
	
	int LocalX = a_Chunk.m_ChunkX % 32;
	if (LocalX < 0)
	{
		LocalX = 32 + LocalX;
	}
	int LocalZ = a_Chunk.m_ChunkZ % 32;
	if (LocalZ < 0)
	{
		LocalZ = 32 + LocalZ;
	}
	unsigned ChunkLocation = ntohl(m_Header[LocalX + 32 * LocalZ]);
	unsigned ChunkOffset = ChunkLocation >> 8;
	
	m_File.Seek(ChunkOffset * 4096);
	
	int ChunkSize = 0;
	if (m_File.Read(&ChunkSize, 4) != 4)
	{
		return false;
	}
	ChunkSize = ntohl(ChunkSize);
	char CompressionType = 0;
	if (m_File.Read(&CompressionType, 1) != 1)
	{
		return false;
	}
	if (CompressionType != 2)
	{
		// Chunk is in an unknown compression
		return false;
	}
	ChunkSize--;
	
	// HACK: This depends on the internal knowledge that AString's data() function returns the internal buffer directly
	a_Data.assign(ChunkSize, '\0');
	return (m_File.Read((void *)a_Data.data(), ChunkSize) == ChunkSize);
}





bool cWSSAnvil::cMCAFile::SetChunkData(const cChunkCoords & a_Chunk, const AString & a_Data)
{
	if (!OpenFile(false))
	{
		LOGWARNING("Cannot save chunk [%d, %d], opening file \"%s\" failed", a_Chunk.m_ChunkX, a_Chunk.m_ChunkZ, GetFileName().c_str());
		return false;
	}

	int LocalX = a_Chunk.m_ChunkX % 32;
	if (LocalX < 0)
	{
		LocalX = 32 + LocalX;
	}
	int LocalZ = a_Chunk.m_ChunkZ % 32;
	if (LocalZ < 0)
	{
		LocalZ = 32 + LocalZ;
	}
	
	unsigned ChunkSector = FindFreeLocation(LocalX, LocalZ, a_Data);

	// Store the chunk data:
	m_File.Seek(ChunkSector * 4096);
	unsigned ChunkSize = htonl(a_Data.size() + 1);
	if (m_File.Write(&ChunkSize, 4) != 4)
	{
		LOGWARNING("Cannot save chunk [%d, %d], writing(1) data to file \"%s\" failed", a_Chunk.m_ChunkX, a_Chunk.m_ChunkZ, GetFileName().c_str());
		return false;
	}
	char CompressionType = 2;
	if (m_File.Write(&CompressionType, 1) != 1)
	{
		LOGWARNING("Cannot save chunk [%d, %d], writing(2) data to file \"%s\" failed", a_Chunk.m_ChunkX, a_Chunk.m_ChunkZ, GetFileName().c_str());
		return false;
	}
	if (m_File.Write(a_Data.data(), a_Data.size()) != (int)(a_Data.size()))
	{
		LOGWARNING("Cannot save chunk [%d, %d], writing(3) data to file \"%s\" failed", a_Chunk.m_ChunkX, a_Chunk.m_ChunkZ, GetFileName().c_str());
		return false;
	}
	
	// Store the header:
	ChunkSize = (a_Data.size() + MCA_CHUNK_HEADER_LENGTH + 4095) / 4096;  // Round data size *up* to nearest 4KB sector, make it a sector number
	ASSERT(ChunkSize < 256);
	m_Header[LocalX + 32 * LocalZ] = htonl((ChunkSector << 8) | ChunkSize);
	if (m_File.Seek(0) < 0)
	{
		LOGWARNING("Cannot save chunk [%d, %d], seeking in file \"%s\" failed", a_Chunk.m_ChunkX, a_Chunk.m_ChunkZ, GetFileName().c_str());
		return false;
	}
	if (m_File.Write(m_Header, sizeof(m_Header)) != sizeof(m_Header))
	{
		LOGWARNING("Cannot save chunk [%d, %d], writing header to file \"%s\" failed", a_Chunk.m_ChunkX, a_Chunk.m_ChunkZ, GetFileName().c_str());
		return false;
	}
	
	return true;
}





unsigned cWSSAnvil::cMCAFile::FindFreeLocation(int a_LocalX, int a_LocalZ, const AString & a_Data)
{
	// See if it fits the current location:
	unsigned ChunkLocation = ntohl(m_Header[a_LocalX + 32 * a_LocalZ]);
	unsigned ChunkLen = ChunkLocation & 0xff;
	if (a_Data.size() + MCA_CHUNK_HEADER_LENGTH <= (ChunkLen * 4096))
	{
		return ChunkLocation >> 8;
	}
	
	// Doesn't fit, append to the end of file (we're wasting a lot of space, TODO: fix this later)
	unsigned MaxLocation = 2 << 8;  // Minimum sector is #2 - after the headers
	for (int i = 0; i < ARRAYCOUNT(m_Header); i++)
	{
		ChunkLocation = ntohl(m_Header[i]);
		ChunkLocation = ChunkLocation + ((ChunkLocation & 0xff) << 8);  // Add the number of sectors used; don't care about the 4th byte
		if (MaxLocation < ChunkLocation)
		{
			MaxLocation = ChunkLocation;
		}
	}  // for i - m_Header[]
	return MaxLocation >> 8;
}