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Content-type: text/plain
> > Wojtek,
> >
> > what about this little snippet?
> >
> > VAR msb, lsb: BYTE; x: SHORTINT;
> > msb, lsb := ...;
> > x := SHORT(msb * 256 + lsb MOD 256)
> >
> > Cheers,
> > Marc
> > Oberon microsystems, Inc.
Instead of
msb * 256 + lsb MOD 256
I've used
ASH (msb, 8) + lsb MOD 256
(see Lib/Mod/Misc.ReadXVector) which is a step
nearer your 'c'.
However I am just starting to use the very interesting
OpenGL library (Ogl) which uses the Component Pascal
type SHORTCHAR for unsigned bytes.
This raises the possibility of
VAR msb, lsb: SHORTCHAR; x: INTEGER;
msb, lsb := ...;
x := ASH (ORD (msb), 8) + ORD (lsb).
The SHORT in Marc's code strips unwanted sign extensions
from x; it wouldn't be needed here.
I haven't tested this idea, and if this thread does have
a lesson it is that these suggestions MUST be tested.
Which of the several possiblities is preferred is a matter
of taste & background; an application note cannot decide those.
Cheers, Robert
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Received on Mon Nov 17 2003 - 18:35:15 UTC