AMD64 dead loop fix

Hi there!

Your oleread.inc is not 64bit safe!

Your function GetInt4d does not act correctly. It
should do something equal to an addition but it uses
bitshift. The bitshift behaves different on a 64bit
enabled system. First bit is always the signum.

The function GetInt4d should be replaced with something
like this:

function GetInt4d($data, $pos) {
// Hacked by Andreas Rehm 2006 to ensure correct
result of the <<24 block on 32 and 64bit systems
$_or_24 = ord($data[$pos+3]);
if ($_or_24>=128) $_ord_24 = -abs((256-$_or_24) << 24);
else $_ord_24 = ($_or_24&127) << 24;

return ord($data[$pos]) | (ord($data[$pos+1]) << 8) |
(ord($data[$pos+2]) << 16) | $_ord_24;
}

Regards,
Andreas Rehm