[gdal-dev] hdf5 dataset. Header data too long. Truncated

[Rashad M]

On Tue, Sep 1, 2015 at 5:08 PM, Even Rouault <even.rouault at spatialys.com>
wrote:

> Le mardi 01 septembre 2015 16:50:32, Rashad M a écrit :
> > Hello all,
> >
> > I have an the following warning from gdal when reading .h5 dataset
> >
> > Warning 2: Header data too long. Truncated.
> >
> > Looking at frmts/hdf5/hdf5dataset.cpp there is a define for
> > MAX_METADATA_LEN
> >
> > #define MAX_METADATA_LEN 32768
> >
> >
> > and there is a check
> >                 if( CPLStrlcat(szValue, szData, MAX_METADATA_LEN) >=
> >
> > MAX_METADATA_LEN )
> >                     CPLError( CE_Warning, CPLE_OutOfMemory,
> >                               "Header data too long. Truncated\n");
> >
>
> This was introduced in https://trac.osgeo.org/gdal/changeset/20438 to
> avoid
> crashes. Potentially it could be reworked to deal with arbitrary long
> metadata. Although it could be kind of annoying to have too long values as
> metadata item, especially in the main metadata domain. A cleaner solution
> would perhaps be have something like "MY_ITEM=<value removed because too
> large. query HDF5 metadata domain to get it>" and you'd have the full
> value in
> the HDF5 metadata domain (perhaps not unlimited but with a much higher
> limit,
> let's say 1 MB per item). People with more experience with HDF5 datasets
> could
> perhaps comment.
>

All of the truncated messages are coming when reading double. Here there is
 %.15g. Isn't that too much ?  Could it be reduced or change to simply %g
for double.?
https://trac.osgeo.org/gdal/browser/branches/1.11/gdal/frmts/hdf5/hdf5dataset.cpp#L800


>
> > Now I could update MAX_METADATA_LEN but is there a way it can set be set
> at
> > runtime ?
>
> No, you need to recompile.
>
> --
> Spatialys - Geospatial professional services
> http://www.spatialys.com
>



-- 
Regards,
   Rashad
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