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// WSSAnvil.h
// Interfaces to the cWSSAnvil class representing the Anvil world storage scheme
#pragma once
#include "WorldStorage.h"
enum
{
// The MCA header is 8 KiB
MCA_HEADER_SIZE = 8192,
} ;
// fwd: "NBT.h"
class cNBTTag;
class cWSSAnvil :
public cWSSchema
{
typedef cWSSchema super;
public:
cWSSAnvil(cWorld * a_World) : super(a_World) {}
virtual ~cWSSAnvil();
protected:
class cMCAFile
{
public:
cMCAFile(const AString & a_FileName, int a_RegionX, int a_RegionZ);
bool GetChunkData(const cChunkCoords & a_Chunk, AString & a_Data);
int GetRegionX (void) const {return m_RegionX; }
int GetRegionZ (void) const {return m_RegionZ; }
const AString & GetFileName(void) const {return m_FileName; }
protected:
int m_RegionX;
int m_RegionZ;
cFile m_File;
AString m_FileName;
// The header, copied from the file so we don't have to seek to it all the time
// First 1024 entries are chunk locations - the 3 + 1 byte sector-offset and sector-count
// The next 1024 entries are chunk timestamps - unused in MCS
unsigned m_Header[MCA_HEADER_SIZE / sizeof(unsigned)];
} ;
typedef std::list<cMCAFile *> cMCAFiles;
cCriticalSection m_CS;
cMCAFiles m_Files; // a MRU cache of MCA files
/// Gets chunk data from the correct file; locks CS as needed
bool GetChunkData(const cChunkCoords & a_Chunk, AString & a_Data);
/// Loads the chunk from the data (no locking needed)
bool LoadChunkFromData(const cChunkCoords & a_Chunk, const AString & a_Data);
/// Loads the chunk from NBT data (no locking needed)
bool LoadChunkFromNBT(const cChunkCoords & a_Chunk, cNBTTag & a_NBT);
/// Gets the correct MCA file either from cache or from disk, manages the m_MCAFiles cache; assumes m_CS is locked
cMCAFile * LoadMCAFile(const cChunkCoords & a_Chunk);
// cWSSchema overrides:
virtual bool LoadChunk(const cChunkCoords & a_Chunk) override;
virtual bool SaveChunk(const cChunkCoords & a_Chunk) override;
virtual const AString GetName(void) const override {return "anvil"; }
} ;
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