[Gdal-dev] Reading ArcInfo binary grids with the R rgdalpackage fails with "GDAL Error 3: Attempt to read past EOF in..../arc.dir"

[Roger Bivand]

Comments inline below:


Even Rouault wrote:
> 
> Le Wednesday 22 July 2009 20:53:31 Jason Roberts, vous avez écrit :
>> It sounds like you have figured out the problem. Is now the moment that I
>> should contact the rgdal developers and ask them to build rgdal against
>> the
>> 1.6 branch?
> 
> It's up to them. I don't know what their policy is. I doubt though that
> they 
> would build against an unreleased version.
> 
> "Comment RSB - Right. Windows 32-bit users who are not able to build their
> GDAL, or to build rgdal from source against either FWTools or OSGEO4W DLLs
> are provided with an automatic build using DLLs for GDAL, PROJ, and lately
> EXPAT produced locally under MSYS. I would prefer not to have to build a
> one-off MSYS version of the DLLs against an unreleased GDAL, because other
> commits may have broken other things."
> 
>>
>> Currently it looks like rgdal is built against the 1.6.1 release. I'm not
>> sure if they'll want to build against the current 1.6 branch or want to
>> wait until 1.6.2.
> 
>> Do you know when 1.6.2 might be issued? 
> 
> No, nothing planned for the moment AFAIK
> 
> "Comment RSB - The failure is happening in the very simple function
> RGDAL_OpenDataset() at line 408 in:
> 
> http://rgdal.cvs.sourceforge.net/viewvc/rgdal/rgdal/src/gdal-bindings.cpp?revision=1.32&view=markup
> 
> calling (GDALDataset *) GDALOpen. If there was a way to trap the error by
> passing some setting out before the GDALOpen call, I could do that. The
> alternative is for Jason to build rgdal from source against some other
> GDAL, PROJ, and EXPAT DLLs as suggested in the README.windows file in the
> package until 1.6.2 or the next released version."
> 
> Roger
> 
> 
>>
>> Jason
>>
>> -----Original Message-----
>> From: gdal-dev-bounces at lists.osgeo.org
>> [mailto:gdal-dev-bounces at lists.osgeo.org] On Behalf Of Even Rouault
>> Sent: Wednesday, July 22, 2009 2:25 PM
>> To: Gregory, Matthew
>> Cc: gdal-dev at lists.osgeo.org
>> Subject: Re: [gdal-dev] Reading ArcInfo binary grids with the R
>> rgdalpackage fails with "GDAL Error 3: Attempt to read past EOF
>> in..../arc.dir"
>>
>> Le Wednesday 22 July 2009 20:17:43 Gregory, Matthew, vous avez écrit :
>> > > For people affected by the issue, not being able to build
>> > > GDAL from source and not interested in the raster attribute
>> > > table, they can just rename the 'info'
>> > > directory, so it won't be read at all and won't trigger the error.
>> > >
>> > > See http://trac.osgeo.org/gdal/ticket/3031
>> >
>> > Um, this makes me really nervous to advocate renaming the INFO
>> > directory, but maybe I'm overreacting.
>>
>> This is just a workaround for people stuck with a version affected by the
>> issue.
>>
>> > I think your recent fix of not
>> > calling ReadRAT() in AIGDataset::Open() eliminates this workaround,
>> > correct?
>>
>> The workaround is still there, but yeah, the latest change in trunk makes
>> it
>>
>> more or less useless.
>>
>> > Just as long as the user doesn't call GetDefaultRAT()?
>>
>> There's no point trying to read the RAT until it is really needed. And
>> the
>> entry point for it is GetDefaultRAT(), hence the late opening of the RAT
>> through the AVC driver in this method.
>>
>> > matt
>>
>> _______________________________________________
>> gdal-dev mailing list
>> gdal-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
> 
> 
> _______________________________________________
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> 
> 


-----
Roger Bivand
Economic Geography Section
Department of Economics
Norwegian School of Economics and Business Administration
Helleveien 30
N-5045 Bergen, Norway

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