ID: 47564
Comment by: vivekanandan8 at yahoo dot com
Reported By: laacz at laacz dot lv
Status: Open
Bug Type: Strings related
Operating System: 6.1-STABLE FreeBSD (amd64)
PHP Version: 5.2.9
New Comment:
Hi,
Generally the Zend engine holds any variable as zval which holds
the integer as long data type only.
32 bit Platform: long => 4 byte = 32 bit
64 bit Platform: long => 8 byte = 64 bit
64 bit Platform: unsigned int => 4 byte = 32 bit
Hence in the 64 bit platform, we have to convert from long to unsigned
int only in 64 bit Platform.
Hence in php source php5.3-200903301230/ext/standard/pack.c
In PHP_FUNCTION(unpack) place, add this convertion immediate
after php_unpack function as folows.
v |= php_unpack(&input[inputpos], 4, issigned, map);
if (sizeof(long) > 4) { v = (unsigned int) v; }
I tested in both 32 & 64 bit platform ,it works fine , please close
this Bug
Regards,
vivekanandan
Previous Comments:
------------------------------------------------------------------------
[2009-03-04 16:43:21] laacz at laacz dot lv
Description:
------------
Unpacking unsigned long (32bit; always big endian; "N") on 64bit
system returns 64bit signed int instead of 32bit.
You can do & 0xffffffff on unpacked value, and get desired result,
but that's still a bug.
Reproduce code:
---------------
<?php
list(,$command_id) = unpack('N', chr(0x80) . chr(0x00) . chr(0x00) .
chr(0x09));
echo hexdec(dechex($command_id)) . "\n0x" . dechex($command_id) .
"\n";
?>
Expected result:
----------------
2147483657
0x80000009
Actual result:
--------------
1.8446744071562E+19
0xffffffff80000009
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=47564&edit=1
