[mkgmap-dev] Feature Request: mkgmap able to create gmap archive (BaseCamp)

Sun Dec 4 10:13:48 GMT 2016

In tdb file exists such block 0x54. And it must have 20 byte. in your 
example i see only 18 byte ? Block 0x54 contains  CRC sum of the tdb 
file ( without the 0x54 block) the crc is stored in byte 0x54+5, 
0x54+12, 0x54+15, 0x54+20.

0x54+5=Int(nCRCSum / 16777216)  'vByteD

0x54+12=Int((nCRCSum - vByteD * 16777216) / 65536) ' vByteC

0x54+15=Int((nCRCSum - vByteD * 16777216 - vByteC * 65536) / 256)    'vByteB

0x54+20=Int(nCRCSum - vByteD * 16777216 - vByteC * 65536 - vByteB * 256)

all other bytes=0

thomas

Am 04.12.2016 um 10:40 schrieb Patrik Brunner:
> Steve,
>
> I've downloaded both versions of gmapi-builder.py, the one from 
> bitbucket and the one from the mkgmap code base. They're bit different 
> and I couldn't find a version number when checking quickly, but only 
> the mkgmap version supports -i for mdx files. Therefore I continued 
> with the mkgmap codebase version only.
>
> The tool runs through and creates a loadable gmap directory for 
> BaseCamp (tested only on Windows).
>
> But it also give out an 'error' or 'warning' about an unknown block, 
> possibly to be checked further when implementing in mkgmap:
>
>     Unknown Block: 54, length: 20,
>     '\x00\x00\xf7\x00\x00\x00\x00\x00\x00j\x00\x00\x99\x00\x00\x00\x00`\x00\x00'
>
> Attached the complete command output ran with -v.... please ignore the 
> copyright/license output... the strange content is testing stuff from 
> another construction area, as you know... license information and 
> unicode  ;-)
>
> Testing inside this construction area will be next on my list for today...
>
> Thanks and regards
> Patrik
>
> On 03.12.2016 23:26, Steve Ratcliffe wrote:
>> Hi
>>
>>> I'm wondering if it would be possible that mkgmap is able to
>>> create/convert maps also in the gmap (gmapi) format used for 
>>> BaseCamp on
>>> Windows and Macintosh.
>>
>> Yes, this seems a reasonable thing to do.
>>
>> In the mkgmap code base there is a python program called
>> gmapi-builder.py in the scripts directory.
>>
>> See also https://bitbucket.org/berteun/gmapibuilder/overview
>> and http://wiki.openstreetmap.org/wiki/Gmapibuilder.
>>
>> This is a converter, but should work on all platforms with python
>> installed, or could be made to do so...
>> The first step is to verify that it works; then it should
>> be easy enough to implement within mkgmap itself.
>>
>> ..Steve
>> _______________________________________________
>> mkgmap-dev mailing list
>> mkgmap-dev at lists.mkgmap.org.uk
>> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>
>
>
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