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So far I 've gathered that when subtype has 0x80 set no lbl pointers
are given ; instead if byte 7 >&EF , ie F0 or F1 then byte 8
and 7 contain an algo for calculating the size of label that follows
terminated by 0. This<br>
is followed by 3 bytes which determine the length of the information
stream , depending, possibly, on the 8th bit being set .<br>
<br>
It's still a mystery:<br>
<br>
btw 0x 40 flag when set always add an extra 3 bytes<br>
<br>
Perhaps like you , I have no idea what all these bytes mean.<br>
<br>
Nick<br>
<br>
<br>
<div class="moz-cite-prefix">On 24/09/2014 10:39, Steve Ratcliffe
[via GIS] wrote:<br>
</div>
<blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' cite="mid:54229113.7070404@parabola.me.uk" type="cite">
On 24/09/14 07:31, nwillink wrote:
<br>
> To me this is what I expected looking at various NT imgs.
<br>
> It might mean that POIs do have a maximum of 1FF only if 7th
bit of subtype
<br>
> is not set?
<br>
<br>
I don't know much about extended types. The mkgmap code says this
for
<br>
extended points:
<br>
<br>
* type is written first, then subtype.
<br>
* type has no flags so its possible range is 0x0 to 0xff
<br>
* subtype has two flags:
<br>
* 0x20 - has a label
<br>
* 0x80 - has extra bytes after the label (describes marine buoy
<br>
lights etc)
<br>
so the possible subtype range is 0-0x1f (as expected)
<br>
* There are no flags on LBL offset.
<br>
<br>
Of course there may be other flags we don't know about and
<br>
the possible range may not be fully utilised by any device.
<br>
<br>
..Steve
<br>
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