[mkgmap-dev] What's the maximum size of global index MDR size?

Sun Dec 12 14:36:35 GMT 2021

Hi Ticker,

I have 3 maps with compressed strings. Only one (Adria Topo) has these sections filled. I think those sections are not related to MDR 15.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Ticker Berkin <rwb-mkgmap at jagit.co.uk>
Gesendet: Sonntag, 12. Dezember 2021 15:31
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] What's the maximum size of global index MDR size?

Hi Gerd

In the example with the compressed strings, did it have Mdr30/31 and/or
Mdr32/33?

Ticker

On Sun, 2021-12-12 at 11:07 +0000, Gerd Petermann wrote:
> Hi all,
>
> for now I've added a check to stop if the MDR subfile gets > 2G.
> My findings reg. string compression in MDR 15:
> If Mdr15 is compressed I also find an MDR 16 section which is rather
> small.
> My first idea was that MDR15 might be the content of a zipped file,
> but offsets
> into MDR15 never exceed the size of the MDR15 section, so it's more
> likely that
> something simple like Huffman encoding is used and MDR 16 contains
> further
> data (the frequencies of the Huffman tree?)
>
> Gerd

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