[mkgmap-dev] [PATCH v1] Display of the IMG headerFrom WanMil wmgcnfg at web.de on Mon Feb 14 19:17:46 GMT 2011
>> On 12/02/11 15:32, WanMil wrote: >>> I observed that the MapSource search menu is disabled if the MDR file is >>> larger than 0x7FFFFFF (134217727) bytes. >>> >>> Maybe in this case a flag must be set? >> >> My guess is in ImgHeader: >> >> // This sectors, head, cylinders stuff appears to be used by mapsource >> // and they have to be larger than the actual size of the map. It >> // doesn't appear to have any effect on a garmin device or other software. >> int sectors = 0x20; // 0x20 appears to be a max >> header.putShort(OFF_SECTORS, (short) sectors); >> int heads = 0x20; // 0x20 appears to be max >> header.putShort(OFF_HEADS, (short) heads); >> int cylinders = 0x100; // gives 128M will try more later >> >> Try boosting cylinders to 0x200, or try to find if there is a maximum >> useful value like it appears that there is for the others. >> >> ..Steve > > My first simple tries were not successful. MapSource reject the maps > with changed cylinder values. > So I have started to implement the display for the IMG file header to be > able to analyze it. There are many solutions possible: > * Wrong E2 value? My large MDR-IMG files use E2=3. This seems to be too low. > * There are still quite a number of unknown bytes. Some of them are set > in my official Garmin maps. > > WanMil Hopefully the patch helps to find the correct settings for larger IMG files. WanMil -------------- next part -------------- A non-text attachment was scrubbed... Name: imgdisplay_v1.patch Type: text/x-patch Size: 6769 bytes Desc: not available Url : http://lists.mkgmap.org.uk/pipermail/mkgmap-dev/attachments/20110214/b98b1355/attachment.bin
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