Hi
It seems that mkgmap writes some constants that might be important, e.g.
MapDetailBlock.java contains
//01 c3 00 ff
os.write4(0xff00c301);
os.write(0);
os.write(0);
os.write(0);
I've just looked at this. No idea where any of those came from :)
I think those 7 bytes should be:
1 byte: unknown to me
1 byte: Maybe index into block 'S' (0x53)
1 byte: index into block 'R' (0x52) or zero if no block 'R'
4 bytes: a size that is generally related to the size of the file.
cgpsmapper and gmaptool set this size to 256 (and previously to 255)
Block R has the following structure:
1 byte: index number, starting from 1
n bytes: zero terminated string
There is probably only ever one of these. Eg "Europe guide v1"
Gmaptool appears to create one of these with the name "All".
Block S has the following structure:
1 byte: number, probably index into block R
1 byte: number index in this block, starting from 1
n bytes: zero terminated string name
eg: 1,1 "Region 1 - Aus/Switz/N.Italy"
1,2 "Region 2 - France"
1,3 "Region 3 - Germany/Czech Republic"
...
Unfortunately I think they have nothing to do with DEM as
maps without DEM have these. There are lots of unknown
entries in the TDB header, there could be something there.
..Steve
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