Hi Steve,
thanks for the file. On my device nothing is visible at all. But that's kind of
an information, too. There is no way to circle down bugs by simply skipping the
extended part.
Probably it is still some missing encoding. In the Isle of Man map (and others)
there is much more information in the RGN header. Note the values in the
"filling bytes". And there seems to be an additional section after the extended
point2 section. I called it offset1/length2.
--- RGN header ---
size 007D
type 47 41 52 4D 49 4E 20 52 47 4E | GARMIN RGN
byte0x0000000C 01
flag 00
year 2010
month 7
day 21
hour 9
minute 53
second 6
offset1 0000D54E
length1 00000000
offset_polyg2 0000D54E
length_polyg2 00001A1F
byte0x00000025_0x00000038 02 00 00 00 00 00 00 00 FF 00 00 20 FD FC 03 00
00 00 00 00
offset_polyl2 0000EF6D
length_polyl2 00000000
byte0x00000041_0x00000054 00 00 00 00 00 00 00 00 3F 00 00 20 FD 0F 00 00
00 00 00 00
offset_point2 0000EF6D
length_point2 00000000
byte0x0000005D_0x00000070 00 00 00 00 00 00 00 00 FF 07 00 20 3F F7 3F 00
00 00 00 00
offset2 0000EF6D
length2 0000020B
unknown 000000E3
This section has a variable length in different sub-files. The unknown value E3
can be E5, too. It doesn't seem to be a record size.
I had a look at several sections. They are not completely random, thus there
seem to be no "compression". However the patterns do not ring a bell for me. I
copied a couple of them into a file and loaded it into my cloud share:
https://www.magentacloud.de/share/s429h1z-r6
Maybe one of you has an idea what it's about. I also uploaded my current
version of the test map with a single raster map tile. It does not show. Top
left coordinate is N46° 57.768 E011° 47.484.
Sadly I am stuck here and I am running out of quality time to concentrate on
the topic.
I also have to update QMapShack's decoding. While reading the mkgmap source
code I noticed a lot of new stuff that is not covered by the decoder.
Cheers
Oliver
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