Mike Beckerle created DAFFODIL-2221:
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             Summary: Ability to compute CRC, checksums, parity fields. - 
related to layering?
                 Key: DAFFODIL-2221
                 URL: https://issues.apache.org/jira/browse/DAFFODIL-2221
             Project: Daffodil
          Issue Type: New Feature
          Components: DFDL Language, Front End
    Affects Versions: 2.4.0
            Reporter: Mike Beckerle
             Fix For: 3.0.0


A DFDL language extension has been requested allowing data to be validated, and 
unparsed that contains fields computed based on representation of other 
elements/groups. E.g., checksums, or CRC codes, or parity elements.

 

Seems closely related to the layering features added to Daffodil as an 
experimental DFDL extension feature, and proposed for inclusion in DFDL v2.0 
version of the standard.

But it's not exactly the same, as there needs to be a way to refer to the 
layer, and obtain a value from the layer when parsing and when unparsing.



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