Olabusayo Kilo created DAFFODIL-3059:
----------------------------------------
Summary: prefixed Element can't be bit aligned
Key: DAFFODIL-3059
URL: https://issues.apache.org/jira/browse/DAFFODIL-3059
Project: Daffodil
Issue Type: Bug
Components: Back End
Affects Versions: 4.0.0
Reporter: Olabusayo Kilo
The spec expects the prefixedType of the prefixed element to be 1 (without
specification of alignment Units). Everything works as expected when alignment
units is in bytes, with the following schema.
{code:xml}
<xs:include
schemaLocation="/org/apache/daffodil/xsd/DFDLGeneralFormatPortable.dfdl.xsd"/>
<dfdl:format
ref="ex:GeneralFormat"
representation="text"
lengthKind="delimited"
separatorPosition="infix"
lengthUnits="bytes"
alignmentUnits="bytes"
encoding="US-ASCII"
/>
<xs:simpleType name="prefixType" dfdl:lengthKind="explicit" dfdl:length="1">
<xs:restriction base="xs:int"/>
</xs:simpleType>
<xs:element name="prefixed_element">
<xs:complexType>
<xs:sequence>
<xs:element name="e1" dfdl:lengthKind="implicit"
dfdl:fillByte="E">
<xs:complexType>
<xs:sequence>
<xs:element name="c" type="xs:string"
dfdl:length="2"
dfdl:lengthKind="explicit"
dfdl:alignment="2"
dfdl:fillByte="C"/>
<xs:element name="a" type="xs:string"
dfdl:prefixLengthType="ex:prefixType"
dfdl:prefixIncludesPrefixLength="no"
dfdl:lengthKind="prefixed"
dfdl:alignment="2"
dfdl:fillByte="A"/>
<xs:element name="b" type="xs:string"
dfdl:length="2"
dfdl:lengthKind="explicit"
dfdl:alignment="2"
dfdl:fillByte="B"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:defineSchema>
{code}
However things break with the following SDE if alignmentunits = bits, since
the alignment still has to fulfill the requirement of being 1. But it is going
to be 1 bit instead, which is illegal for US-ASCII encoding
SDE: org.apache.daffodil.tdml.TDMLExceptionImpl: (Implementation: daffodil)
SchemaDefinitionError: The given alignment (1 bits) must be a multiple of the
encoding specified alignment (8 bits) for int when representation='text'.
Encoding: US-ASCII
{code:xml}
<tdml:defineSchema name="s2" elementFormDefault="unqualified">
<xs:include
schemaLocation="/org/apache/daffodil/xsd/DFDLGeneralFormatPortable.dfdl.xsd"/>
<dfdl:format
ref="ex:GeneralFormat"
representation="text"
lengthKind="delimited"
separatorPosition="infix"
lengthUnits="bits"
alignmentUnits="bits"
encoding="US-ASCII"
/>
<xs:simpleType name="prefixType" dfdl:lengthKind="explicit" dfdl:length="8">
<xs:restriction base="xs:int"/>
</xs:simpleType>
<xs:element name="prefixed_element">
<xs:complexType>
<xs:sequence>
<xs:element name="e1" dfdl:lengthKind="implicit"
dfdl:fillByte="E">
<xs:complexType>
<xs:sequence>
<xs:element name="c" type="xs:string"
dfdl:length="16"
dfdl:lengthKind="explicit"
dfdl:alignment="16"
dfdl:fillByte="C"/>
<xs:element name="a" type="xs:string"
dfdl:prefixLengthType="ex:prefixType"
dfdl:prefixIncludesPrefixLength="no"
dfdl:lengthKind="prefixed"
dfdl:alignment="16"
dfdl:fillByte="A"/>
<xs:element name="b" type="xs:string"
dfdl:length="16"
dfdl:lengthKind="explicit"
dfdl:alignment="16"
dfdl:fillByte="B"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</tdml:defineSchema>
{code}
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
