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  1. Daffodil
  2. DFDL-1302

Parse/Unparse: Issue when handling empty optional array followed by scalar

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Normal
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 1.1.0
    • Component/s: None
    • Labels:
      None

      Description

      Unparsing:
      A schema was set up by dev for testing that contained a sequence of an optional array and a scalar. I added a sample unparsing test (impOptArrayThenScalar02 in daffodil-test/src/test/resources/edu/illinois/ncsa/daffodil/section16/array_optional_elem/UnparseArrayImplicitOptionalElem.tdml) that uses an infoset that has the optional array not present. At first I used the following as the infoset:

          <tdml:infoset xmlns="http://example.com">
            <tdml:dfdlInfoset>
              <r4>
                <sca>3</sca>
              </r4>
            </tdml:dfdlInfoset>

      The test failed with the following error:

      [error] Test edu.illinois.ncsa.daffodil.section16.array_optional_elem.TestUnparseArrayOptionalElem.test_impOptArrayThenScalar02 failed: edu.illinois.ncsa.daffodil.tdml.TDMLException: output data length 0 for List() doesn't match expected value 1 for List(51)

      When I added in an empty element for the non-present array, the test passed:

          <tdml:infoset xmlns="http://example.com">
            <tdml:dfdlInfoset>
              <r4>
                <opt/>
                <sca>3</sca>
              </r4>
            </tdml:dfdlInfoset>
          </tdml:infoset>

      I wasn't sure if this was the beviour that we would expect, so I wrote up a parsing test case to see if the empty element is generated (impOptArrayThenScalar02b in daffodil-test/src/test/resources/edu/illinois/ncsa/daffodil/section16/array_optional_elem/ArrayOptionalElem.tdml). My document is a single character, and I get the following error:

      [error] Test edu.illinois.ncsa.daffodil.section16.array_optional_elem.TestArrayOptionalElem.test_impOptArrayThenScalar02b failed: edu.illinois.ncsa.daffodil.processors.ParseError: Parse Error: StringFixedLengthInBytesFixedWidthCharacters - Insufficient Bits in field: IndexOutOfBounds: 
      [error] null
      [error] Schema context: One(element.sca) List(element.sca)
      [error] Data location was preceding byte 1
      [error] UTF-8 text starting at byte 0 is: (3)
      [error] Data (hex) starting at byte 0 is: (0x33)

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              Assignee:
              jchab Jessie Chab
              Reporter:
              jchab Jessie Chab
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                Updated:
                Resolved:

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