[mkgmap-dev] Some new (?) findings about global index structure MDR 3

Tue Nov 23 10:30:38 GMT 2021

Hi Gerd

How did you get a Mdr3?
I've been using MapInstall then running various display modes on the
gmapsupp and MdrSummary reports

initial values    7    2    e
MDR 1  NR=2     (000002) RS=4  magic=0x0
MDR 4  NR=117   (000075) RS=3  magic=0x0
MDR 5  NR=17164 (00430c) RS=8  magic=0x151
MDR 6  NR=3456  (000d80) RS=3  magic=0x1
MDR 7  NR=14330 (0037fa) RS=6  magic=0x66
MDR 9  NR=11    (00000b) RS=3  magic=0x0
MDR 10 DataSize=159564   (00026f4c) magic=0x0
MDR 11 NR=39891 (009bd3) RS=9  magic=0x91
MDR 12 NR=4     (000004) RS=6  magic=0x40a
MDR 17 DataSize=68363    (00010b0b) magic=0x0
MDR 18 NR=118   (000076) RS=4  magic=0x5
MDR 19 NR=39891 (009bd3) RS=3  magic=0x2
MDR 20 NR=17401 (0043f9) RS=6  magic=0xe
MDR 22 NR=14292 (0037d4) RS=6  magic=0xc000e
MDR 24 NR=2     (000002) RS=6  magic=0x0
MDR 25 NR=17144 (0042f8) RS=2  magic=0x0
MDR 29 NR=1     (000001) RS=6  magic=0x16

MdrCheck doesn't have section for it

MdrDisplay has:

MDR 2           0010bfd9 len=0      next=0010bfd9
 implied size=0           (0x0)
MDR 3           0010bfd9 len=0      next=0010bfd9
 implied size=0           (0x0)
MDR 4           0010bfd9 len=15f    next=0010c138
 fixed record size 3
 number of records 117.00
 implied size=351         (0x15f)

Ticker

On Tue, 2021-11-23 at 10:12 +0000, Gerd Petermann wrote:
> Hi all,
> 
> I think MDR 3 is just like MDR 4, see 
> https://www.mkgmap.org.uk/websvn/listing.php?repname=display&rev=562
> and
> https://www.mkgmap.org.uk/websvn/listing.php?repname=display&rev=563
> 
> In both sections we have the "unknown" byte with values from 0 .. 3
> (all values spotted)
> and so far I can only guess that these are bit flags.
> 
> MdrCheck should read this section to avoid error messages like
> ERROR: 49908: poi 29158 type was 41, expected 4100 
> 
> Gerd
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