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Posted to commits@daffodil.apache.org by "Mike Beckerle (Jira)" <ji...@apache.org> on 2021/07/06 19:11:00 UTC
[jira] [Commented] (DAFFODIL-2221) Ability to compute CRC,
checksums, parity fields. - related to layering?
[ https://issues.apache.org/jira/browse/DAFFODIL-2221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17375956#comment-17375956 ]
Mike Beckerle commented on DAFFODIL-2221:
-----------------------------------------
Here's a more detailed task breakdown for this:
|Design| |
| |ethernet, IPv4, UDP, TCP checksum schema|
| |gps parity schema ([~mbeckerle] has a spec that is GPS data with these parity bits in the format)|
| |asciidoc design writeup|
| |review cycle on design doc and examples (dev mailing list and/or asciidoc review on daffodil-site github PR for the asciidoc file)|
|Implement & Test feature| |
| |Primary coding, PR, review cycle, debug|
| |Implement plug-ins (assuming uses layer plugins per DAF-1927)|
| |publish updated ethernet and PCAP schema to github|
| |implement GPS parity feature (plug in)|
| |Incorporate generic tests into Daffodil test suites|
|Documentation| |
| |update asciidoc design document to reflect final design decisions (with review cycle)|
| |create end-user feature documentation and tutorial (with review cycle)|
> 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
> Priority: Major
>
> 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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