LevelDB support

db.h

@@ -0,0 +1,18 @@
+#ifndef _DB_H
+#define _DB_H
+
+#include <cstdint>
+#include <vector>
+#include <list>
+#include <string>
+
+typedef std::pair<int64_t, std::basic_string<unsigned char>> DBBlock;
+typedef std::list<DBBlock> DBBlockList;
+
+class DB {
+public:
+	virtual std::vector<int64_t> getBlockPos()=0;
+	virtual DBBlockList getBlocksOnZ(int zPos)=0;
+};
+
+#endif // _DB_H