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
>
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