Hi Quincey, looking forward to get your results of the file analysis.
Best Regards Markus -----Ursprüngliche Nachricht----- Von: Hdf-forum [mailto:[email protected]] Im Auftrag von Quincey Koziol Gesendet: Dienstag, 5. September 2017 21:28 An: HDF Users Discussion List <[email protected]> Betreff: Re: [Hdf-forum] HDF lib incompatible with HDF file spec? Indeed. :-) I don’t have time to look into Markus’s file today, but I will take a look tomorrow and see what the best course of action is. Quincey > On Sep 5, 2017, at 2:22 PM, Latham, Robert J. <[email protected]> wrote: > > On Tue, 2017-09-05 at 17:21 +0000, Miller, Mark C. wrote: >> Hmm. If I understand you, you have written code that you believe >> produces an HDF5 file according to the 3.0 file version >> specification, https://support.hdfgroup.org/HDF5/doc/H5.format.html >> but nevertheless does NOT use the HDF5 library to do it. Furthermore, >> where 'extended padding' is concerned, your implementation does >> business differently than the HDF5 implementation. >> >> You can prove HDF5 tools will *read* the file ok. But, in a read- >> modify-write scenario, the file is getting corrupted by HDF5 library >> due to the difference in how the two implementations handle the >> extended padding -- a feature that you explain is '...not defined at >> all -- not even recommended'. >> >> Is that about right? >> >> If so, it does indeed sound like a potential issue in the file format >> specification for HDF5. >> >> Your scenario sounds like a super useful test case...does a wholly >> independent implementation produce a file the HDF5 library can >> "handle"? > > Over in Parallel-NetCDF land a few years back, we took, um, a "rather > aggressive interpretation" of the NetCDF spec with respect to > alignment and then opend a bug with Unidata when their tools did not > follow the rules as written. > > As Mark observes, it was a productive exercise in keeping both > implementations honest. > > ==rob > > _______________________________________________ > Hdf-forum is for HDF software users discussion. > [email protected] > http://lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.or > g > Twitter: https://twitter.com/hdf5 _______________________________________________ Hdf-forum is for HDF software users discussion. [email protected] http://lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org Twitter: https://twitter.com/hdf5 _______________________________________________ Hdf-forum is for HDF software users discussion. [email protected] http://lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org Twitter: https://twitter.com/hdf5
