From 69a4ee53830121714927c37e4f0b9a357cd03957 Mon Sep 17 00:00:00 2001
From: "madmaxoft@gmail.com"
 <madmaxoft@gmail.com@0a769ca7-a7f5-676a-18bf-c427514a06d6>
Date: Wed, 7 Mar 2012 11:28:24 +0000
Subject: Added the Anvil level format (MCA) support, read-only for the time
 being. Now MCS can read your worlds from the official server :)

git-svn-id: http://mc-server.googlecode.com/svn/trunk@380 0a769ca7-a7f5-676a-18bf-c427514a06d6
---
 source/WSSAnvil.h | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 source/WSSAnvil.h

(limited to 'source/WSSAnvil.h')

diff --git a/source/WSSAnvil.h b/source/WSSAnvil.h
new file mode 100644
index 000000000..f02a30119
--- /dev/null
+++ b/source/WSSAnvil.h
@@ -0,0 +1,95 @@
+
+// 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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