[mkgmap-dev] Please help

Thu Dec 30 07:26:58 GMT 2021

Hi Gerd

The only thing I can add is that the large mdr file is part of the 
current Garmin NT file structure , ie Topo France V3 , which might 
explain the 2 additional bytes.

Nick

On 30/12/2021 07:19, Gerd Petermann wrote:
> Hi Nick and Ticker,
>
> there is another problem with the large mdr file.
> The POI section (MDR 11) seems to contain 2 unexpected additional bytes before(!) the known bytes for city and MDR15 offset.
> We should really try to find out the meaning of the magic number in MDR11 instead of looking at the recsize only.
> The current logic also fails with a gmapsupp index and tries to read MDR 15 offsets :(
> Maybe we can learn something for mkgmap there.
>
> I'm working on an implementation of Huffman encoding in mkgmap first...
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Gerd Petermann <gpetermann_muenchen at hotmail.com>
> Gesendet: Mittwoch, 29. Dezember 2021 12:29
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] Please help
>
> Hi all,
>
> thanks for all the input.
> It answered most of the open questions, display tool r577 should be able to analyse
> all the files. Binary is here: https://files.mkgmap.org.uk/detail/543
>
> See also https://www.mkgmap.org.uk/websvn/listing.php?repname=display&rev=576
> and https://www.mkgmap.org.uk/websvn/listing.php?repname=display&rev=577
>
> @Nick: the larger MDR seems to cause trouble when section 1 is displayed. Will look into this later.
> r577 should work with option --print=!1
> This option means that all but the 1st section should be printed, will cause
> huge output for that file, but string decoding seems to work well
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von nick <osm at pinns.co.uk>
> Gesendet: Mittwoch, 29. Dezember 2021 12:03
> An: mkgmap-dev at lists.mkgmap.org.uk
> Betreff: Re: [mkgmap-dev] Please help
>
> Hi Ticker / Gerd
>
> I've found another one which I think included mdr15 but second byte = 0x15
>
> Also added a mdr.mdrfrom Topo France V3  which the display.jar couildn't
> parse but might be of interest
>
> Warning file  sz is large
>
> https:\pinns.co.uk\2812\mdr2.zip
>
> HTH
>
> Nick
>
> On 29/12/2021 09:31, Ticker Berkin wrote:
>> Hi Nick
>>
>> Thanks.
>>
>> Interesting, but not maybe not relevant to the Huffman stuff, in
>> mdr16austria.txt the MDR headers go out of sync after MDR30
>>
>> Ticker
>>
>>
>> On Tue, 2021-12-28 at 18:28 +0000, nick wrote:
>>> Hi Gerd
>>>
>>> OK thanks will check that tomorrow.
>>>
>>> I think it's amazing how far both of you got.
>>>
>>> Nick
>>>
>>> On 28/12/2021 18:26, Gerd Petermann wrote:
>>>> Hi Nick,
>>>>
>>>> yes, and esp. those MDR 16 which do not have a 0x15 at offset 2
>>>> like in this example:
>>>> 000003fa | 000000 | aa 04 15 1b 15 08 cf 00 | record 0 (len: 300,
>>>> 0x12c)
>>>>
>>>> Gerd
>>>>
>>>> ________________________________________
>>>> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag
>>>> von nick <osm at pinns.co.uk>
>>>> Gesendet: Dienstag, 28. Dezember 2021 19:21
>>>> An: mkgmap-dev at lists.mkgmap.org.uk
>>>> Betreff: Re: [mkgmap-dev] Please help
>>>>
>>>> Hi Gerd
>>>>
>>>> Great but as you confusing, although typically Garmin  ;)
>>>>
>>>> I noticed some are called map_mdr.img.
>>>>
>>>> I'll check some other pc s tomorrow; I suppose you are specifically
>>>> looking for mdr16
>>>>
>>>> Nick
>>>>
>>>>
>>>> On 28/12/2021 18:17, Gerd Petermann wrote:
>>>>> Hi Nick,
>>>>>
>>>>> thanks, the mdr file looks like a very early version with a very
>>>>> different structure. Should help to understand the remaining bits
>>>>> :)
>>>>>
>>>>> Gerd
>>>>>
>>>>> ________________________________________
>>>>> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im
>>>>> Auftrag von nick <osm at pinns.co.uk>
>>>>> Gesendet: Dienstag, 28. Dezember 2021 19:00
>>>>> An: mkgmap-dev at lists.mkgmap.org.uk
>>>>> Betreff: Re: [mkgmap-dev] Please help
>>>>>
>>>>> Hi Gerd
>>>>>
>>>>> I have done a few for you, including one which causes a java
>>>>> error so
>>>>> added the mdr
>>>>>
>>>>> https:\pinns.co.uk\2812\mdrmap.zip
>>>>>
>>>>> Wishing you and Ticker  every success! Great Job !
>>>>>
>>>>> r
>>>>>
>>>>> Nick
>>>>>
>>>>> On 28/12/2021 14:55, Gerd Petermann wrote:
>>>>>> java -ea  -Xmx6800m -cp
>>>>>> d:\display\dist\display.jar;d:\mkgmap\dist\mkgmap.jar
>>>>>> test.display.MdrDisplay MDRMAP.img   --print=16 > mdr16.txt
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