[mkgmap-dev] MDR 9 & 10 groups

Tue Apr 16 11:50:34 BST 2019

Hi Gerd & Steve

When I was running with a small example it seemed that the MDR9 was
written in group order, each with start record to MDR10 that is
calculated on the assumption that MDR10 was also generated in the same
group order. However the step in MDR10 caused by a single 0x28/group 9
POI appeared incorrect.

Now, with a real map, I'm having trouble working out what is going on
and it might be correct. I need to check more carefully. 

I thought LinkedHashMap did preserve an order.

Regards
Ticker

On Tue, 2019-04-16 at 05:46 +0000, Gerd Petermann wrote:
> Hi Ticker,
> 
> I also don't know what 0x28 is, but you are probably right that the
> code is wrong. A change from
> LinkedHashMap to TreeMap for field index in MDR9 should fix this,
> right?
> 
> Gerd
> 
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag
> von Steve Ratcliffe <steve at parabola.me.uk>
> Gesendet: Montag, 15. April 2019 23:12
> An: mkgmap-dev at lists.mkgmap.org.uk
> Betreff: Re: [mkgmap-dev] MDR 9 & 10 groups
> 
> 
> Hi Ticker
> 
> > So, the first question is, does anyone know why 0x28 was given it's
> > own
> > group.
> 
> I've no idea why, but that is the way it is as far as I could
> determine.
> 
> > The second problem is that the code that builds up the group start
> > indexes into Mdr10 for Mdr9 assumes that the type ranges of the POI
> > allocated for a group are in the same order as the groups, so, if
> > you
> > actually have a POI of type 0x28 then, because it has a lower type
> > but
> > a higher group than the 0x2a..30 range/groups, mdr9 is wrong.
> 
> I don't see where that happens but that would be wrong and mdr9
> should be ordered by group.
> 
> Cheers
> Steve
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