Add dummy and LevelDB database backends

src/database-dummy.h

@@ -0,0 +1,26 @@
+#ifndef DATABASE_DUMMY_HEADER
+#define DATABASE_DUMMY_HEADER
+
+#include "map.h"
+#include "mapsector.h"
+#include "mapblock.h"
+#include "main.h"
+#include "filesys.h"
+#include "database.h"
+
+class Database_Dummy : public Database
+{
+public:
+	Database_Dummy(ServerMap *map);
+	virtual void beginSave();
+	virtual void endSave();
+        virtual void saveBlock(MapBlock *block);
+        virtual MapBlock* loadBlock(v3s16 blockpos);
+        virtual void listAllLoadableBlocks(core::list<v3s16> &dst);
+        virtual int Initialized(void);
+	~Database_Dummy();
+private:
+	ServerMap *srvmap;
+	std::map<unsigned long long, std::string> m_database;
+};
+#endif