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Request #36306 crc32() function result differs on 32-bit and 64-bit platforms
Submitted: 2006-02-06 18:34 UTC Modified: 2012-07-26 17:23 UTC
From: anight at eyelinkmedia dot com Assigned: pajoye (profile)
Status: Wont fix Package: *General Issues
PHP Version: 4.4.2 OS: independant
Private report: No CVE-ID: None
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From: anight at eyelinkmedia dot com
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 [2006-02-06 18:34 UTC] anight at eyelinkmedia dot com 
Description:
------------
I noticed that crc32() function result is represented differently on 32-bit and 64-bit platforms. The problem is whithin crc32.c file,

  unsigned int crc = ~0;

After actual crc32 calculations result is inverted and then casted to "long":

    RETVAL_LONG(~crc);

Proposed patch:

    RETVAL_LONG(~ (long) crc);

I tested it successfully on 64-bit linux and macosx, it works well.

Reproduce code:
---------------
<? echo crc32("platform independant") . "\n"; ?>


Expected result:
----------------
I expect to see value -858128794 both on 32-bit and 64-bit platform.


Actual result:
--------------
On 64-bit platform i see 3436838502
On 32-bit -858128794

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 [2006-02-07 01:27 UTC] pajoye@php.net 
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
Thank you for the report, and for helping us make PHP better.
 [2012-07-26 17:23 UTC] hholzgra@php.net
-Status: Closed +Status: Wont fix -Package: Feature/Change Request +Package: *General Issues
 [2012-07-26 17:23 UTC] hholzgra@php.net 
the fix was actually reverted, see http://php.net/crc32 for further details ...
 
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