diff --git a/TileGenerator.cpp b/TileGenerator.cpp
index cd8b14d..cfc2619 100644
--- a/TileGenerator.cpp
+++ b/TileGenerator.cpp
@@ -22,13 +22,17 @@ TileGenerator::TileGenerator():
 	m_drawOrigin(false),
 	m_drawPlayers(false),
 	m_drawScale(false),
-	m_drawUnderground(false)
-
+	m_drawUnderground(false),
+	m_db(0)
 {
 }
 
 TileGenerator::~TileGenerator()
 {
+	if (m_db != 0) {
+		sqlite3_close(m_db);
+		m_db = 0;
+	}
 }
 
 void TileGenerator::setBgColor(const std::string &bgColor)
@@ -71,10 +75,6 @@ void TileGenerator::setDrawUnderground(bool drawUnderground)
 	m_drawUnderground = drawUnderground;
 }
 
-void TileGenerator::generate(const std::string &/*input*/, const std::string &/*output*/)
-{
-}
-
 void TileGenerator::parseColorsFile(const std::string &fileName)
 {
 	ifstream in;
@@ -108,3 +108,61 @@ void TileGenerator::parseColorsFile(const std::string &fileName)
 	}
 }
 
+void TileGenerator::generate(const std::string &input, const std::string &/*output*/)
+{
+	openDb(input);
+	loadBlocks();
+}
+
+void TileGenerator::openDb(const std::string &input)
+{
+	string db_name = input + "map.sqlite";
+	if (sqlite3_open(db_name.c_str(), &m_db) != SQLITE_OK) {
+		throw DbError();
+	}
+}
+
+void TileGenerator::loadBlocks()
+{
+	sqlite3_stmt *statement;
+	string sql = "SELECT pos FROM blocks";
+	if (sqlite3_prepare_v2(m_db, sql.c_str(), sql.length(), &statement, 0) == SQLITE_OK) {
+		//int cols = sqlite3_column_count(statement);
+		int result = 0;
+		while (true) {
+			result = sqlite3_step(statement);
+			if(result == SQLITE_ROW) {
+				sqlite3_int64 blocknum = sqlite3_column_int64(statement, 0);
+				decodeBlockPos(blocknum);
+			}
+			else {
+				break;
+			}
+		}
+	}
+	else {
+		throw DbError();
+	}
+}
+
+inline BlockPos TileGenerator::decodeBlockPos(sqlite3_int64 blockId)
+{
+	BlockPos pos;
+	pos.x = unsignedToSigned(blockId % 4096, 2048);
+	blockId = blockId / 4096;
+	pos.y = unsignedToSigned(blockId % 4096, 2048);
+	blockId = blockId / 4096;
+	pos.z = unsignedToSigned(blockId % 4096, 2048);
+	return pos;
+}
+
+inline int TileGenerator::unsignedToSigned(long i, long max_positive)
+{
+	if (i < max_positive) {
+		return i;
+	}
+	else {
+		return i - 2l * max_positive;
+	}
+}
+
diff --git a/TileGenerator.h b/TileGenerator.h
index 346feb8..5ce5bfc 100644
--- a/TileGenerator.h
+++ b/TileGenerator.h
@@ -10,9 +10,10 @@
 #ifndef TILEGENERATOR_H_JJNUCARH
 #define TILEGENERATOR_H_JJNUCARH
 
+#include <map>
+#include <sqlite3.h>
 #include <stdint.h>
 #include <string>
-#include <map>
 
 struct Color {
 	uint8_t r;
@@ -20,6 +21,15 @@ struct Color {
 	uint8_t b;
 };
 
+struct BlockPos {
+	int x;
+	int y;
+	int z;
+};
+
+class DbError {
+};
+
 class TileGenerator
 {
 private:
@@ -36,8 +46,14 @@ public:
 	void setDrawPlayers(bool drawPlayers);
 	void setDrawScale(bool drawScale);
 	void setDrawUnderground(bool drawUnderground);
-	void generate(const std::string &input, const std::string &output);
 	void parseColorsFile(const std::string &fileName);
+	void generate(const std::string &input, const std::string &output);
+
+private:
+	void openDb(const std::string &input);
+	void loadBlocks();
+	BlockPos decodeBlockPos(sqlite3_int64 blockId);
+	int unsignedToSigned(long i, long max_positive);
 
 private:
 	std::string m_bgColor;
@@ -48,6 +64,7 @@ private:
 	bool m_drawPlayers;
 	bool m_drawScale;
 	bool m_drawUnderground;
+	sqlite3 *m_db;
 	ColorMap m_colors;
 }; /* -----  end of class TileGenerator  ----- */
 
diff --git a/mapper.cpp b/mapper.cpp
index 848cb5d..8a7cae7 100644
--- a/mapper.cpp
+++ b/mapper.cpp
@@ -105,4 +105,5 @@ int main(int argc, char *argv[])
 				abort();
 		}
 	}
+	generator.generate(input, output);
 }