[mkgmap-dev] gmapi reader?

Sun Jan 28 16:38:32 GMT 2018

Hi Steve, I hope you can help me out here.

I've implemented a new option --x-dem-reuse which allows to copy the DEM file
from an older map. 
My idea is that the option specifies the path to either
1) a gmapsupp or
2) a gmap folder  or
3) a directory containing *.img files 
from a previous run with similar dem-dist option and tile boundaries.

If given, mkgmap tries to find the matching *.DEM in any of these formats,
checks if the content matches the wanted boundary and dem-dist option and - if ok -
uses the existing file instead of doing the DEM calculations again.

At the moment I have some working quick+dirty code (see attached patch).
I assume the new code in MapBuilder should go somewhere in package uk.me.parabola.imgfmt.app,
maybe a new class ImgFinder or so? Or do we already have such code in mkgmap?
What I also don't like is that it copies the data from the existing file into memory.
Is there already an easy way to avoid that?

Gerd

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