[OSM-dev] TomTom map format

Florian Lohoff flo at rfc822.org
Tue Dec 30 22:38:12 GMT 2008


On Tue, Dec 30, 2008 at 09:48:04PM +0100, Stefan de Konink wrote:
> Subject: Re: [OSM-dev] TomTom map format
> 
> Matthias Rötsch wrote:
> > is there already someone how is analysing the TomTom map format or are
> > there small bits of knowledge about it?
> > I want to give it a try, even if it leads to nothing. But I just have
> > few experience with file format reverse engineering.
> 
> We have looked at the postcode format that revealed a bit of the used 
> strings. If you really want to work on decryption I suggest taking qemu 
> and trying out to run the arm binary of a 'specific' embedded release. 
> It is quite obvious that you must be able to run it in the qemu debugger...
> 
> > At a first look it seems quiet structured, not compressed and at least
> > not entirely encrypted.
> 
> I have the same observation; I wouldn't be surprised if they first 
> define the scope of the structures in the file format to be compatible 
> between every release that is using that interpreter; and then bit 
> efficient encode it.

I'd be interested in bit hacking too - Have the findings been documented
somewhere? Would a seperate list make sense?

Flo
-- 
Florian Lohoff                  flo at rfc822.org             +49-171-2280134
	Those who would give up a little freedom to get a little 
          security shall soon have neither - Benjamin Franklin
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