[DAFFODIL-2703] Unaligned RightFill does not unparse correctly

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 3.3.0
• Fix Version/s: 4.0.0
• Component/s: Back End, Back End C-Generator
• Assignee: John Interrante
• Reporter: Steve Lawrence
• Created: 10/Jun/22 13:58
• Updated: 03/Apr/24 17:02

Description

See the attached unalignedRightFill.tdml file for reproducible tests.

Data is a single byte. Only the most significant bit is actual data. The remaining 7 bits are RightFill region using a fillByte value of 0xF0. So the data should always unparse to X111 0000, where the value of X comes from the infoset.

Note that runtime1 and runtime2 have different behaviors, neither of which I think is correct:
 
 

unalignedRightFill_01 (bit from infoset is 1)

should unparse to 0xF0 (1111 0000)

runtime1 unparses to 0xBF (1011 1111)

runtime2 unparses to 0x9F (1001 1111)

 

unalignedRightFill_02 (bit from infoset is 0)

should unparse to 0x70 (0111 0000)

runtime1 unaprses to 0x3F (0011 1111)

runtime2 unparses to 0x1F (0001 1111)