[vtkusers] #Defines for Big or Little Endian

[Glen Lehmann]

Yes, Mike,

Sorry, thought you were looking for the VTK-equivalent.  You can
always check your compiler defines by running:

cpp -E -dM /dev/null

or

gcc -x c++ -E -dM /dev/null

Cheers,

Glen

On 01/09/06, Mike Jackson <imikejackson at gmail.com> wrote:
> Actually,
>    Apple has this exact set of methods in their open source Core Foundation
> code.
>
> So for example they have:
>
> vtkTypeUInt32 CFSwapInt32BigToHost(vtkTypeUInt32 arg)
> {
>
> #if defined(__BIG_ENDIAN__)
>
> return arg;
>
> #else
>
> return CFSwapInt32(arg);
>
> #endif
>
> }
>
> vtkTypeUInt32 CFSwapInt32(vtkTypeUInt32 arg) {
> #if defined(__i386__) && defined(__GNUC__)
>     __asm__("bswap %0" : "+r" (arg));
>     return arg;
>
> #elif defined(__ppc__) && defined(__GNUC__)
>
>     vtkTypeUInt32 result;
>     __asm__("lwbrx %0,0,%1" : "=r" (result) : "r" (&arg), "m" (arg));
>     return result;
>
> #else
>     vtkTypeUInt32 result;
>     result = ((arg & 0xFF) << 24) | ((arg & 0xFF00) << 8) | ((arg >> 8) &
> 0xFF00) | ((arg >> 24) & 0xFF);
>     return result;
>
> #endif
>
> }
>
> This is basically what I am looking for.
>
> Thanks for all those that replied with help.
> Mike Jackson
>
> On 9/1/06 7:24 AM, "Bob Palank" <bob at stlcc.org> wrote:
>
> > Why not write the integer(s) to disk and then use a Hex editor to inspect
> > the file ?
> > ByteViewer works for me.
> > BR
> >   Bob
> >
> > -----Original Message-----
> > From: vtkusers-bounces+bob=stlcc.org at vtk.org
> > [mailto:vtkusers-bounces+bob=stlcc.org at vtk.org]On Behalf Of Mike Jackson
> > Sent: Thursday, August 31, 2006 3:36 PM
> > To: VTK Users
> > Subject: [vtkusers] #Defines for Big or Little Endian
> >
> >
> > Is there a #define some where that I can use to test if I am running
> > on a big or little endian machine?
> >
> > Beyond that, are there already methods some where that I have not
> > found that will take a value, say UIn32 and swap the bytes to whatever
> > the system is? Something like:
> >
> > ByteSwap::swapLEToSystem( UInt32 );
> >
> > Thanks
> >
> > --
> > Mike Jackson
> > imikejackson _at_ gee-mail dot com
> > _______________________________________________
>
>
>
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