[jira] [Commented] (DAFFODIL-2221) Ability to compute CRC, checksums, parity fields. - related to layering?

["Mike Beckerle (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DAFFODIL-2221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17419924#comment-17419924 ] 

Mike Beckerle commented on DAFFODIL-2221:
-----------------------------------------

Initial implementation with ipv4-based example computing checksum is in this PR: [https://github.com/apache/daffodil/pull/643]

 

> 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
>
> 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.



--
This message was sent by Atlassian Jira
(v8.3.4#803005)