new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  # vim: ts=2 sw=2 et ai
  from compiler.pyassem import CONV
  
  ###############################################################################
  # Copyright (c) 2012,2013,2014 Andreas Vogel andreas@wellenvogel.net
  # Copyright (c) 2017 free-x 1073657+free-x@users.noreply.github.com
  #
  #  Permission is hereby granted, free of charge, to any person obtaining a
  #  copy of this software and associated documentation files (the "Software"),
  #  to deal in the Software without restriction, including without limitation
  #  the rights to use, copy, modify, merge, publish, distribute, sublicense,
  #  and/or sell copies of the Software, and to permit persons to whom the
  #  Software is furnished to do so, subject to the following conditions:
  #
  #  The above copyright notice and this permission notice shall be included
  #  in all copies or substantial portions of the Software.
  #
  #  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  #  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  #  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  #  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  #  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  #  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  #  DEALINGS IN THE SOFTWARE.
  ###############################################################################
  
  import os
  import struct
  import sys
  import ctypes
  import threading
  import sqlite3
  import logging
  import create_gemf
  
  logger=logging.getLogger(__name__)
  
  def navipack_connect(navipack_file):
      try:
          con = sqlite3.connect(navipack_file)
          return con
      except Exception as e:
          logger.error("Could not connect to database")
          logger.exception(e)
          raise e
  
  
  def convertnavipack(nameOut,namesIn):
    gemf=create_gemf.GemfWriter(nameOut);
    source="default"
    for nameIn in namesIn:
      con=navipack_connect(nameIn)
      logger.info("importing navipack (header) from %s to %s",nameIn,nameOut)
      #write header data
      tiles = con.execute("SELECT zyx, png FROM tiles")
      t = tiles.fetchone()
      while t:
        izyx = int(t[0])
        x = izyx & 0b11111111111111111111
        y = (izyx & ( 0b11111111111111111111 << 20)) >> 20
        z = (izyx & ( 0b11111111111111111111 << 40)) >> 40
        logger.debug("tile z=%d,x=%d,y=%d",z,x,y)
        ts=set([(z,x,y)])
        gemf.addTileSet(source,ts)
        t=tiles.fetchone()
      con.close()
    logger.info("creating gemf header for %s",nameOut)
    gemf.finishHeader()
    logger.info("gemf has %d ranges",len(gemf.ranges))
    for nameIn in namesIn:
      con=navipack_connect(nameIn)
      logger.info("importing navipack (data) from %s to %s",nameIn,nameOut)
      tiles = con.execute("SELECT zyx, png FROM tiles")
      t = tiles.fetchone()
      while t:
        izyx = int(t[0])
        x = izyx & 0b11111111111111111111
        y = (izyx & ( 0b11111111111111111111 << 20)) >> 20
        z = (izyx & ( 0b11111111111111111111 << 40)) >> 40
        data = t[1]
        logger.debug("tile data z=%d,x=%d,y=%d",z,x,y)
        gemf.addTile(source,(z,x,y),data)
        t=tiles.fetchone()
      con.close()
    logger.info("closing gemf file %s",nameOut)
    gemf.closeFile()
  
  if __name__ == "__main__":
    if len(sys.argv) < 3:
      raise Exception("missing parameter, usage: %s gemfname navipack [navipack]..."%(sys.argv[0]))
    convertnavipack(sys.argv[1],sys.argv[2:])
  
        
  
subject: Add navipack converter