1 files changed, 133 insertions, 0 deletions
diff --git a/source/WorldStorage/WSSAnvil.h b/source/WorldStorage/WSSAnvil.h
new file mode 100644
index 000000000..18e3ce8ad
--- /dev/null
+++ b/source/WorldStorage/WSSAnvil.h
@@ -0,0 +1,133 @@
+
+// WSSAnvil.h
+
+// Interfaces to the cWSSAnvil class representing the Anvil world storage scheme
+
+
+
+
+#pragma once
+
+#include "WorldStorage.h"
+#include "FastNBT.h"
+
+
+
+
+
+enum
+{
+	/// Maximum number of chunks in an MCA file - also the count of the header items
+	MCA_MAX_CHUNKS = 32 * 32,
+	
+	/// The MCA header is 8 KiB
+	MCA_HEADER_SIZE = MCA_MAX_CHUNKS * 8,
+	
+	/// There are 5 bytes of header in front of each chunk
+	MCA_CHUNK_HEADER_LENGTH = 5,
+} ;
+
+
+
+
+
+class cWSSAnvil :
+	public cWSSchema
+{
+	typedef cWSSchema super;
+	
+public:
+
+	cWSSAnvil(cWorld * 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);
+		bool SetChunkData  (const cChunkCoords & a_Chunk, const AString & a_Data);
+		bool EraseChunkData(const cChunkCoords & a_Chunk);
+		
+		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
+		unsigned m_Header[MCA_MAX_CHUNKS];
+		
+		// Chunk timestamps, following the chunk headers, are unused by MCS
+		
+		/// Finds a free location large enough to hold a_Data. Gets a hint of the chunk coords, places the data there if it fits. Returns the sector number.
+		unsigned FindFreeLocation(int a_LocalX, int a_LocalZ, const AString & a_Data);
+		
+		/// Opens a MCA file either for a Read operation (fails if doesn't exist) or for a Write operation (creates new if not found)
+		bool OpenFile(bool a_IsForReading);
+	} ;
+	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 file CS as needed
+	bool GetChunkData(const cChunkCoords & a_Chunk, AString & a_Data);
+
+	/// Sets chunk data into the correct file; locks file CS as needed
+	bool SetChunkData(const cChunkCoords & a_Chunk, const AString & a_Data);
+
+	/// Loads the chunk from the data (no locking needed)
+	bool LoadChunkFromData(const cChunkCoords & a_Chunk, const AString & a_Data);
+	
+	/// Saves the chunk into datastream (no locking needed)
+	bool SaveChunkToData(const cChunkCoords & a_Chunk, AString & a_Data);
+	
+	/// Loads the chunk from NBT data (no locking needed)
+	bool LoadChunkFromNBT(const cChunkCoords & a_Chunk, const cParsedNBT & a_NBT);
+	
+	/// Saves the chunk into NBT data using a_Writer; returns true on success
+	bool SaveChunkToNBT(const cChunkCoords & a_Chunk, cFastNBTWriter & a_Writer);
+	
+	/// Loads the chunk's biome map; returns a_BiomeMap if biomes present and valid, NULL otherwise
+	cChunkDef::BiomeMap * LoadBiomeMapFromNBT(cChunkDef::BiomeMap * a_BiomeMap, const cParsedNBT & a_NBT, int a_TagIdx);
+	
+	/// Loads the chunk's entities from NBT data (a_Tag is the Level\\Entities list tag; may be -1)
+	void LoadEntitiesFromNBT(cEntityList & a_Entitites, const cParsedNBT & a_NBT, int a_Tag);
+	
+	/// Loads the chunk's BlockEntities from NBT data (a_Tag is the Level\\TileEntities list tag; may be -1)
+	void LoadBlockEntitiesFromNBT(cBlockEntityList & a_BlockEntitites, const cParsedNBT & a_NBT, int a_Tag);
+	
+	void LoadChestFromNBT  (cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx);
+	void LoadFurnaceFromNBT(cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx);
+	void LoadSignFromNBT   (cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx);
+	void LoadNoteFromNBT   (cBlockEntityList & a_BlockEntities, const cParsedNBT & a_NBT, int a_TagIdx);
+	
+	/// Helper function for extracting the X, Y, and Z int subtags of a NBT compound; returns true if successful
+	bool GetBlockEntityNBTPos(const cParsedNBT & a_NBT, int a_TagIdx, int & a_X, int & a_Y, int & a_Z);
+	
+	/// 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);
+	
+	/// Copies a_Length bytes of data from the specified NBT Tag's Child into the a_Destination buffer
+	void CopyNBTData(const cParsedNBT & a_NBT, int a_Tag, const AString & a_ChildName, char * a_Destination, int a_Length);
+		
+	// 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"; }
+} ;
+
+
+
+