[mkgmap-dev] Please try and report results of Huffman compression

Mon Jan 17 04:26:25 GMT 2022

Hi Ticker,

yes, one byte at a time. Else we would need symbol width > 8, and Garmin doesn't use that for the unicode maps that I know.to
I plan to contact the author of GPXsee, Martin Tůma. He seems to know much more than we do and maybe he is willing to help.

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, 16. Januar 2022 23:40
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] Please try and report results of Huffman compression

Hi Gerd

So, for unicode, it just runs on the stream of utf-8 representation a
byte at a time, rather than on unicode chars? It works but is not a
good compression.

Ticker

On Sun, 2022-01-16 at 19:16 +0000, Gerd Petermann wrote:
> Hi Ticker,
>
> you seem to think that the encoder must understand what a codepoint
> is?
> I don't think so. The only important thing is that utf-8 still can
> use a single 0
> to terminate strings.
>
> 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, 16. Januar 2022 19:43
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] Please try and report results of Huffman
> compression
>
> Hi Gerd
>
> More unicode problems: The data structures for the frequency analysis
> and then the list of chars to encode will all need attention.
>
> Ticker
>
>
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