I think we need more information, specifically how do you know what is the last Import_Lookup_Table?
Within an Import_Lookup_Table you say that the Lookup_Table_Entry ends with the last entry is all nulls, but that doesn't tell us where the last Import_Lookup_Table is. Is it when there's a special value of a Lookup_Table_Entry? Or maybe when the Import_Lookup_table has a no Lookup_Table_Entires and just has the terminating Null? Something else? You'll likely need to add a discriminator somewhere, but we'd need more information to know what that discriminator should be. - Steve On 3/3/19 7:55 AM, Costello, Roger L. wrote: > Hello DFDL community, > > In the Windows EXE file format there is one or more Import_Lookup_Tables > followed by a Hint_Name_Table. I am struggling with how to inform Daffodil, > “Hey > Daffodil, the input is finished with the Import_Lookup_Tables, now it’s time > to > build the Hint_Name_Table.” I am hoping you can show me how to inform > Daffodil > of this. > > Each Import_Lookup_Table consists of one of more 32-bit fields, terminated by > a > 32-bit field containing all nulls. > > The Hint_Name_Table consists of one of more entries; each entry consists of a > 2-byte address, followed by a null-terminated name, followed by an optional > null > (to align to a 2-byte boundary). > > Here is a graphic that illustrates the Import_Lookup_Tables followed by the > Hint_Name_Table: > > Here is the relevant portion of my DFDL schema: > > <xs:elementname="idata_Section"> > <xs:complexType> > <xs:sequence>> > <xs:elementref="Import_Lookup_Table" > maxOccurs="unbounded"/> > <xs:elementref="Hint_Name_Table"/> > </xs:sequence> > </xs:complexType> > </xs:element> > > <xs:elementname="Import_Lookup_Table"> > <xs:complexType> > <xs:sequence> > <xs:elementref="Lookup_Table_Entry" > maxOccurs="unbounded"/> > <xs:elementname="Null_Lookup_Table_Entry" > type="xs:hexBinary" > dfdl:lengthKind="explicit" > dfdl:length="4" > dfdl:lengthUnits="bytes"> > <xs:annotation> > <xs:appinfosource="http://www.ogf.org/dfdl/";> > <dfdl:assert> > { . eq xs:hexBinary("00000000") } > </dfdl:assert> > </xs:appinfo> > </xs:annotation> > </xs:element> > </xs:sequence> > </xs:complexType> > </xs:element> > > How do I inform Daffodil that the input has finished with the > Import_Lookup_Tables? > > /Roger >
