Subversion Repositories mkgmap

#
# Copyright (C) 2006 Steve Ratcliffe
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License version 2 as
#  published by the Free Software Foundation.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#
# Author: Steve Ratcliffe
# Create date: 18 Dec 2006
#

import sys
from imgfile import Imgfile
from struct import *

def main():
        myimg = Imgfile('gmapsupp.bad')
        workimg = Imgfile('pp')

        for dtype in ('LBL','RGN'):
                ld1 = myimg.get_dirent(dtype)
                ld2 = workimg.get_dirent(dtype)

                # Get first block of the sub file itself
                bl = ld1.get_block(0)
                ld2.write_block(0, bl)

        # So TRE is what kills it, investigate further.

        # copy our first block
        bl = myimg.get_block(0)
        workimg.write_block(0, bl)

        dtype = 'TRE'
        ld1 = myimg.get_dirent(dtype)
        ld2 = workimg.get_dirent(dtype)

        ld2.get_block(0)
        new = ld1.get_block(0)

        # Works
        #off = 0x10
        #new = wrk[0:off] + new[off:]

        off = 0x10
        ch1 = pack("<H10s2BBB", 0x78, "GARMIN TRE", 1, 0, 7, 0x07)
        new = ch1 + new[off:]
        ld2.write_block(0, new)

        workimg.set_time()
        workimg.close()
        #return

        # Copy over the directory entries apart from the block numbers
        for dtype in ('LBL', 'TRE', 'RGN'):
                ld1 = myimg.get_dirent(dtype)
                ld2 = workimg.get_dirent(dtype)

                # existing block
                bl = workimg.get_block(ld2.dir_block_num)

                # transfer first 32 bytes from our file
                bl2 = myimg.get_block(ld1.dir_block_num)
                #bl[0:0x20] = bl2[0:0x20]
                bl = bl2[0:0x20] + bl[0x20:]

                # write it back
                workimg.write_block(ld2.dir_block_num, bl)


if __name__ == '__main__':
        main()