From: troublegum at woltlab dot de
Operating system: Windows XP Professional
PHP version: 5.0.0
PHP Bug Type: GD related
Bug description: imagecreatefrompng() throws fatal error (no warning) when opening
broken images
Description:
------------
imagecreatefrompng() should not throw a fatal error
when opening broken image files. Instead, a warning would be much more
useful.
The following code is useless as the scripts dies without any output. If I
remove the @, it throws the following message:
---
Fatal error: imagecreatefrompng() [function.imagecreatefrompng]: gd-png:
fatal libpng error: Invalid chunk length. in F:\htdocs\bug\read.php on
line 3
---
imagecreatefrompng throws a warning when opening files that are no png
files ('broken.png' is not a valid PNG file) but not when the image file
is a png image, bug is broken for whatever reason.
---
OS: Windows XP Professional
Apache: 2.0.49
PHP: 5.0.0 as apache module
GD: bundled (2.0.23 compatible)
PNG Support: enabled
Reproduce code:
---------------
<?php
$filename = 'broken.png';
$imageResource = @imagecreatefrompng($filename);
if (!$imageResource) {
die('could not read ' . $filename . ' image');
}
else {
echo 'image ' . $filename . ' successfully read';
}
?>
Expected result:
----------------
could not read broken.png image
Actual result:
--------------
Fatal error: imagecreatefrompng() [function.imagecreatefrompng]: gd-png:
fatal libpng error: Invalid chunk length. in F:\htdocs\bug\read.php on
line 3
--
Edit bug report at http://bugs.php.net/?id=29482&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=29482&r=trysnapshot4
Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=29482&r=trysnapshot5
Fixed in CVS: http://bugs.php.net/fix.php?id=29482&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=29482&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=29482&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=29482&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=29482&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=29482&r=support
Expected behavior: http://bugs.php.net/fix.php?id=29482&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=29482&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=29482&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=29482&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=29482&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=29482&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=29482&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=29482&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=29482&r=float
