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

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.0
• Fix Version/s: 3.2.0
• Component/s: DFDL Language, Front End
• Assignee: Mike Beckerle
• Reporter: Mike Beckerle
• Created: 23/Oct/19 15:42
• Updated: 04/Oct/21 17:36
• Resolved: 28/Sep/21 21:40

Description

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.