#36148 [Asn->Csd]: unpack("H*hex", $data) is adding an extra character to the end of the string.

From: Date: Thu, 26 Jan 2006 16:01:26 +0000
Subject: #36148 [Asn->Csd]: unpack("H*hex", $data) is adding an extra character to the end of the string.
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-92515@lists.php.net to get a copy of this message 
 ID:               36148
 Updated by:       iliaa@php.net
 Reported By:      andy at advancethermal dot com
-Status:           Assigned
+Status:           Closed
 Bug Type:         Strings related
 Operating System: *
 PHP Version:      5CVS-2006-01-25 (snap)
 Assigned To:      iliaa
 New Comment:

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.




Previous Comments:
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[2006-01-25 18:59:23] sniper@php.net

Ilia, verified on Linux too.

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[2006-01-25 18:53:49] andy at advancethermal dot com

The latest CVS (5.1.3-dev built Jan 25 2006 16:19:11) does not correct
the problem.

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[2006-01-25 18:22:14] andy at advancethermal dot com

Upon further testing, I found the following:

CODE:
 $values = array("a", "aa", "aaa", "aaaa");
 foreach ($values as $value) {
   $a = pack("H*", $value);
   $b = unpack("H*", $a);
   echo "<p>".$value.": ";
   var_dump($b);
 }

ACTUAL RESULT:
a: array(1) { [1]=> string(3) "a00" }
aa: array(1) { [1]=> string(3) "aa0" }
aaa: array(1) { [1]=> string(5) "aaa00" }
aaaa: array(1) { [1]=> string(5) "aaaa0" }

EXPECTED RESULT: (produced from PHP 5.0.5)
a: array(1) { [1]=> string(2) "a0" }
aa: array(1) { [1]=> string(2) "aa" }
aaa: array(1) { [1]=> string(4) "aaa0" }
aaaa: array(1) { [1]=> string(4) "aaaa" }

The release notes for 5.1.2 indicate that the problem was fixed,
however this does not appear to be the case -- or is a new problem. 
All scripts that handle binary data using unpack() had to be modified
with substr($unpackeddata[1], 0, -1) so it would be properly handled.

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[2006-01-25 00:32:56] tony2001@php.net

See bug #35817.

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[2006-01-25 00:10:45] andy at advancethermal dot com

Sorry, reverse the Expected and Actual Results...

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The remainder of the comments for this report are too long. To view
the rest of the comments, please view the bug report online at
    http://bugs.php.net/36148

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