patch for old dbs geocommons geocoder

geocder.patch

    # Unpack an array of little-endian 4-byte ints, and convert them into
    # signed floats by dividing by 10^6, inverting the process used by the
    # compress_wkb_line() function in the SQLite helper extension.
    def unpack_geometry (geom)
      points = []
      if !geom.nil?
	# Pete - The database format is completely different to the one
	# expected by the code, so I've done some detective work to
	# figure out what it should be. It looks like the format is
	# | 1 byte Type | 4 byte SRID | 4 byte element count| 8 byte double coordinates *
	# I've added new code to read this, and commented out the old.
	#info = geom.unpack('CVVD*')
#	coords = info.slice(3, info.length)
	#points << [coords.shift, coords.shift] until coords.empty?

       coords = geom.unpack "V*" # little-endian 4-byte long ints
      #
      ## now map them into signed floats
        coords.map! {|i| ( i > (1 << 31) ? i - (1 << 32) : i ) / 1_000_000.0}
        points << [coords.shift, coords.shift] until coords.empty?
      end
      points
    end