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Bug #18984 fread() add slashes on the content randomly
Submitted: 2002-08-20 08:58 UTC Modified: 2002-08-20 10:38 UTC
From: dams@php.net Assigned:
Status: Closed Package: Filesystem function related
PHP Version: 4.1.2 OS: Linux debian 2
Private report: No CVE-ID: None
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From: dams@php.net
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 [2002-08-20 08:58 UTC] dams@php.net 
Hi,

on my PHP 4.1.2, fread() adds randomly a addslashes() when 
reading a binary file. Here is the code : 
<?php
$fp=fopen($fichier,"r");
$attendu = filesize($fichier);

$attachmentorig=fread($fp,$attendu);

$lu = strlen($attachmentorig);

print "awaited : $attendu<BR>\n";
print "read : $lu<BR>\n";
fclose($fp);
?>

basically, it reads the file (I used any JPG picture as 
test), and then it happens sometimes (rather unusually) 
that the read size is about 10% bigger than the original 
file size.
The increase in size is always the same, when it happens. 

With further testing, I finally managed to find that, if 
the returned string is bigger than the original file size, 
then applying stripslashes() will solve the trouble.

I tested this also on 4.2.2 (macosx) and fresh 4.3.0-dev, 
and no trouble seems to be reproducable, so it may be a 
solved trouble. It may be a 4.1.2 specific trouble.

I hope this post will help anyone facing this trouble, or 
point some real bug.

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 [2002-08-20 09:10 UTC] sander@php.net 
Are you sure this isn't caused by one of the magic_quotes_* ini settings?
 [2002-08-20 09:13 UTC] nohn@php.net 
Sorry, but the bug system is not the appropriate forum for asking
support questions. Your problem does not imply a bug in PHP itself.
For a list of more appropriate places to ask for help using PHP,
please visit http://www.php.net/support.php

Thank you for your interest in PHP.
 [2002-08-20 09:16 UTC] nohn@php.net 
Verified on these systems as working:

awaited : 1170573
read : 1170573

Compaq Tru64 (php 4.3-dev, php 4.2-dev)
SuSE Linux (php 4.3-dev, php 4.2.2, php 4.0.6)

Magic quotes is off on every system:
 [2002-08-20 09:54 UTC] dams@php.net 
sander : Magic quote is on. off or on, what is strange is 
that usually, there are no quotes added, and, suddenly, for 
a 10 to 20s laps, quotes are added.

Sebastian : 
your test confirm that this trouble seem to be away with 
PHP 4.2.x and upper. Yet, this is really happening 
unfrequently, and I may need up to 10 mins to have it 
happens.
 [2002-08-20 10:38 UTC] edink@php.net 
Thank you for your bug report. This issue has already been fixed
in the latest released version of PHP, which you can download at 
http://www.php.net/downloads.php
 
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