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Bug #12091 zlib uncompress buffer error/ inflate failed
Submitted: 2001-07-12 05:38 UTC Modified: 2002-01-02 20:12 UTC
From: alberty at neptunlabs dot de Assigned:
Status: Closed Package: Zlib related
PHP Version: 4.0CVS-2001-07-12 OS: i686-pc-linux-gnu
Private report: No CVE-ID: None
View Developer Edit
 [2001-07-12 05:38 UTC] alberty at neptunlabs dot de 
Hi,

the follow code produces a deflated string
which php can not inflate.


php results:
"Warning: gzinflate: buffer error in /web/htdocs/thisfile.php"

----
<tt>
<?php
error_reporting(63);
mt_srand ((double) microtime() * 1000000);

for ($original="",$i=0;$i<5000;$i++){
	//$original.=chr(mt_rand()); // 
	$original.="lala "; // problem
}

$packed=gzdeflate($original); // gzcompress
$unpacked=gzinflate($packed); // gzuncompress

echo "Length original:".strlen($original)."<br>";
echo "Length packed:".strlen($packed)."<br>";
echo "Length unpacked:".strlen($unpacked)."<br>";

if (strcmp($original,$unpacked)==0) echo "Strings are equal";
else echo "<b>Strings <u>not</u> equal</b>";
?>
</tt>
----


Regards,


-- 
Steve

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 [2001-07-13 11:15 UTC] thies@php.net 
fixed in CVS


you can make it work in 4.0.6 by changing maxfactor from 8 
to lets say 16 in zlib.c around line 912
 [2001-07-13 13:33 UTC] alberty at neptunlabs dot de 
Hi Thies,

thank you for your changes in zlib.c but you have not
really fix the problem.
If i increase the string repeating from 5000 to 35000,
i have the same problem again, but
i don't no why, sometimes php works correct...

<---snip--->
<tt>
<?php
error_reporting(63);
mt_srand ((double) microtime() * 1000000);

for ($original="",$i=0;$i<35000;$i++){
	//$out.=chr(mt_rand()); // 
	$original.="lala "; // problem
}

$packed=gzdeflate($original); // gzcompress
$unpacked=gzinflate($packed); // gzuncompress

echo "Length original:".strlen($original)."<br>";
echo "Length packed:".strlen($packed)."<br>";
echo "Length unpacked:".strlen($unpacked)."<br>";

if (strcmp($original,$unpacked)==0) echo "Strings are equal";
else echo "<b>Strings <u>not</u> equal</b>";
?>
</tt>
<---snap--->


Regards,

-- 
Steve
 [2001-11-03 22:42 UTC] sniper@php.net 
missing status
 [2002-01-02 20:12 UTC] mfischer@php.net 
I'm pretending this is fixed as I can't reproduce it with current CVS (reopen with sample script if wrong).
 
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