[DFDL-WG] 13.7.1.1 Converting Base-2 Binary Numbers (updated)
Steve Hanson
smh at uk.ibm.com
Tue Dec 9 12:48:35 EST 2014
DFDL WG agreed with all proposed changes.
http://redmine.ogf.org/issues/248
Regards
Steve Hanson
Architect, IBM DFDL
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848
From: Steve Hanson/UK/IBM
To: DFDL-WG <dfdl-wg at ogf.org>
Date: 04/12/2014 12:02
Subject: 13.7.1.1 Converting Base-2 Binary Numbers (updated)
Converting Base-2 Binary Numbers
For both parsing and unparsing, the bit string that represents the content
region for a base-2 binary number is converted to/from an Infoset value by
a calculation that involves the length and the dfdl:byteOrder property.
For unparsing, the dfdl:fillByte property can also be involved.
When parsing, DFDL specifies how an unsigned integer of unbounded
magnitude is computed from a bit string based on its length, and the
dfdl:byteOrder property. For signed types, this unbounded integer is
converted into a signed value by way of the well-known twos-complement
scheme, and for the xs:decimal type, the dfdl:binaryDecimalVirtualPoint
property can be used to convert this integer into a decimal value with an
integer and a fractional component, and for both xs:decimal and the
integer types the dfdl:binaryVirtualDecimalPoint or to scale up the
integer by some scale factor.
1) Why is the fill byte involved here? We are creating a two's complement
value of a particular length. There is no filling going on.
2) Should this now also mention dfdl:bitOrder?
3) BDVP is only used for xs:decimal so the final clause of the last
paragraph should not include integer types.
Regards
Steve Hanson
Architect, IBM DFDL
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848
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
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
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