[jira] [Created] (DAFFODIL-2193) dfdl:lengthKind="prefixed" with dfdl:lengthUnits="characters" gives wrong parse result

["Steve Lawrence (Jira)" <ji...@apache.org>]

Steve Lawrence created DAFFODIL-2193:
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             Summary: dfdl:lengthKind="prefixed" with dfdl:lengthUnits="characters" gives wrong parse result
                 Key: DAFFODIL-2193
                 URL: https://issues.apache.org/jira/browse/DAFFODIL-2193
             Project: Daffodil
          Issue Type: Bug
          Components: Back End, Front End
    Affects Versions: 2.4.0
            Reporter: Steve Lawrence
             Fix For: 2.5.0


{code}
3ABC
{code}
That data can be described with the following schema:
{code:xsd}
<xs:element name="D"type="xs:string"
    dfdl:lengthUnits="characters"
    dfdl:lengthKind="prefixed"
    dfdl:prefixLengthType="D-type"
    dfdl:prefixIncludesPrefixLength="no"/>

<xs:simpleType name="D-type"
    dfdl:lengthKind="explicit"
    dfdl:length="1"> 
  <xs:restrictionbase="xs:integer"/>
</xs:simpleType>
{code}

DAFFODIL-114 added support for lengthKind="characters", but upon testing it looks like it created an Assert.invariant if the lengthKind="characters" for a prefixed length element. On 2.4.0, that invariant doesn't happen, but the lenght is calculated incorrectly. In 2.4.0, it only parses a single character, even though the prefix length is 3.

Also see related DAFFODIL-2029, which is to add support for unparsing lengthKind="characters" prefixed length elements.

If we don't support this yet, we might just want to make it a notYetImplemented error.



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