Errata 2.90. Sections 12.3, 12.3.7.2. Additionally allow lengthUnits 'bits' to apply to binary signed integer types, to support the modeling of signed integer bit fields in the C language. The physical bits are interpreted as a two's complement integer. Regards Steve Hanson Architect, Data Format Description Language (DFDL) Co-Chair, OGF DFDL Working Group IBM SWG, Hursley, UK smh@uk.ibm.com tel:+44-1962-815848 From: Mike Beckerle <mbeckerle.dfdl@gmail.com> To: dfdl-wg@ogf.org, Date: 10/12/2012 21:42 Subject: [DFDL-WG] needed: signed bit fields Sent by: dfdl-wg-bounces@ogf.org current DFDL v1.0 spec says bit fields are all unsigned integers up to length 64. I am modeling data that uses lots of twos-complement 24-bit long and other length signed integers on various bit-boundaries. Was there a reason to leave signed twos-complement out for bit fields (other than perhaps just we thought we might get away with it?) The only corner case I can think of is if you make a 1-bit wide signed bit field. This should be a Schema Defintion Error I believe, because twos-complement isn't defined unless you have at one sign bit, and at least 1 mantissa bit. ...mikeb -- Mike Beckerle | OGF DFDL WG Co-Chair | Tresys Technologies Tel: 781-330-0412 -- dfdl-wg mailing list dfdl-wg@ogf.org https://www.ogf.org/mailman/listinfo/dfdl-wg Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU