Perfect. For other readers of the thread - QNAP is behaving as a mixed endian system unlike other little endian ARM systems such as Radio/Touch and a big-endian Freecom FSG3 NAS which I have. The output of a code pasted below is as follows on different ARM systems
Touch: ENDIAN:LITTLE Test of unpack: 0000000000000ff3 Swap
flag:0
QNAP: ENDIAN:LITTLE Test of unpack: 00000ff300000000 Swap
flag:1
FSG3: ENDIAN:BIG Test of unpack: f30f000000000000 Swap
flag:0
The problem is a word swap which is peculiar to ARM architecture and
some ports of Linux and/or the compiler..
I believe this has confirmed the problem - now the fix needs to be
written..
Code:
--------------------
use constant ENDIAN => unpack('S', pack('C2', 0, 1)) == 1 ? 'BIG' : 'LITTLE';
my $swapDoubles;
my $double = pack ("d",1);
my $hex = unpack("h*",$double);
if ( $hex eq "00000ff300000000"){
$swapDoubles=1;
}
else {
$swapDoubles=0;
}
print "ENDIAN:" . ENDIAN. " Test of unpack: $hex Swap flag:$swapDoubles\n";
--------------------
I copied the code from this CPAN module
http://cpansearch.perl.org/src/EXIFTOOL/Image-ExifTool-7.89/lib/Image/ExifTool.pm
- look for swapWord anbd SwapWords in the file.
--
bpa
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