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ENH: provide machine/OpenFOAM architecture hint in output files (issue #271)
Mark Olesen authored 
  FoamFile
  {
      version     2.0;
      format      binary;
      arch        "LSB;label=32;scalar=64";
      class       vectorField;
      object      points;
  }

There is otherwise no simple indication in any of the files as to the
sizes used (Int32 vs Int64, SP vs DP). This makes it difficult for the
end-user and also for any third-party consumers.

--
The architecture information contains three items in the following format:

    (LSB|MSB);label=(32|64);scalar=(32|64)

- The endian value always appears first, without any leading space.
  This make it trivial to check later. Either the first 3 letters (LSB
  vs MSB) or even just the first letter ('L' vs 'M').

- Subsequent key=value pairs for 'label' and 'scalar' are separated
  by semicolons. The ordering of label vs scalar is not specified.

Note that this 'arch' information is purely informational.
It is currently not used by the OpenFOAM input mechanism itself.
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