ID: 32700
User updated by: [EMAIL PROTECTED]
Reported By: [EMAIL PROTECTED]
-Status: Bogus
+Status: Open
Bug Type: Unknown/Other Function
Operating System: Linux
PHP Version: 4.3.10
New Comment:
While PHP may only support signed integers, the manual for
pack() clearly states, regarding the 'N' format:
"unsigned long (always 32 bit, big endian byte order)"
But it returns a signed int when using this format,
contrary to the documentation.
There's obviously some sort of internal PHP state regarding
the signedness of a particular value, since it's capable of
correctly representing the unsigned value. It just seems
that unpack() is doing something wrong here.
Previous Comments:
------------------------------------------------------------------------
[2005-04-13 22:54:41] [EMAIL PROTECTED]
try printf("%u") though to print it - that would work...
------------------------------------------------------------------------
[2005-04-13 22:54:12] [EMAIL PROTECTED]
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php
PHP only supports signed integers.
------------------------------------------------------------------------
[2005-04-13 22:49:33] [EMAIL PROTECTED]
Description:
------------
unpack() returns signed long values when the high bit is
set, even though the unpack format is set to unsigned long.
Workaround:
$foo = unpack('N', $data);
$foo = $foo << 1 >> 1;
$foo += 0x80000000;
Reproduce code:
---------------
// High bit is set.
$before = 0x80000002;
echo "Before: $before\n"; // Outputs '2147483650'
$int = pack('N', $before);
$res = unpack('N', $int);
$after = $res[1];
echo "After: $after\n"; // Outputs '-2147483646'
Expected result:
----------------
$before and $after should be the same number.
Actual result:
--------------
$after is treated as signed, and does not equal $before.
Script output:
Before: 2147483650
After: -2147483646
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=32700&edit=1
