[DAFFODIL-2731] Need test to reproduce DAFFODIL-2726

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.4.0
• Component/s: Clean Ups, Diagnostics, QA
• Assignee: Unassigned
• Reporter: Mike Beckerle
• Created: 15/Sep/22 22:26
• Updated: 15/Sep/22 22:26

Description

Bug DAFFODIL-2726 was a complex situation that came up in a large schema project that is not available on the WWW. 

It involved some interaction of bit-order changes, layer transformers, and maybe computed lengths.

A test is needed in Daffodil's built-in tests that reproduces the issue without needing this unavailable DFDL schema.

Aspects of that schema that the test may need:

• big endian primary header with stored length. bitOrder MSBF
  • All fields of the primary header are required.
• secondary header (mil-std-2045)  littleEndian LSBF 1-bit aligned with 20 bit stored length that is only of the bytes after the header.
  • Some fields of the secondary header are optional using 1-bit flags.
• alignment to a byte boundary
• layer transform (such as gzip)
• data format of the data in the layer is bigEndian byte oriented. 
  • contains a variable-length array of structures.