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https://issues.apache.org/jira/browse/DAFFODIL-2221?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dave Thompson closed DAFFODIL-2221.
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Verified the specified commit (commit ae51bfb375ca3e58a963816044e6b499f5422265)
is included in the latest pull from the daffodil repository.
Verified changes identified in commit comment were implemented.
Verified the affected daffodil subproject sbt test suites execute successfully
including added tests.
Verified the nightly test schemas compile and save successfully.
Verified the nightly test suite executes successfully.
> 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
> Assignee: Mike Beckerle
> Priority: Major
> Fix For: 3.2.0
>
>
> 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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