[mkgmap-dev] Please help

Thu Dec 30 07:19:27 GMT 2021

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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