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Bug #30942 imageCreateFromPng() gives fatal error
Submitted: 2004-11-30 13:20 UTC Modified: 2005-01-24 14:24 UTC
From: hkh at netnords dot dk Assigned: pajoye (profile)
Status: Not a bug Package: GD related
PHP Version: 4.3.8 OS: win XP
Private report: No CVE-ID: None
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From: hkh at netnords dot dk
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 [2004-11-30 13:20 UTC] hkh at netnords dot dk 
Description:
------------
Sometimes when calling imageCreateFromPng() it produces a fatal error instead of returning an empty string.


Reproduce code:
---------------
/*
 *  The code are placed inside this function 
 *  &getImage($IfilePathName)
 */
return imageCreateFromPng($IfilePathName);





Expected result:
----------------
An empty string.


After the documentation the function should return a resource on succes, and on error an empty string.



Actual result:
--------------
<b>Fatal error</b>:  imagecreatefrompng(): gd-png:  fatal libpng error: Invalid chunk length. in <b>
C:\Documents and Settings\hkh\Desktop\php\desktop\bmpNoget.inc.php</b> on line <b>98</b><br />

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 [2004-11-30 13:49 UTC] pajoye@php.net 
Are you using the bundled gd library ("configure --with-gd" and not --with-gd=/path/to/gd).

Cannot reproduce it with all branches and 4.3.8.

--Pierre
 [2004-12-02 11:19 UTC] hkh at netnords dot dk 
I found out witch pictures, who gives this error. It's png's created with acdsee (used to convert bmp's to png's). I have experinced no trouble with these png's in other programs.


I also found out, some of the png's gives a
<b>Fatal error</b>:  imagecreatefrompng(): gd-png:  fatal libpng error: Too many IDAT's found


Run a phpinfo() who tells me
   GD Version  bundled (2.0.23 compatible)  


The ini file contains this
   extension=php_gd2.dll
 [2004-12-02 11:35 UTC] pajoye@php.net 
Please provide an url with these images please (if possible both bmp and png).

--Pierre
 [2004-12-02 12:01 UTC] hkh at netnords dot dk 
http://www.hanskejserhansen.dk/png/

I don't have the original pictures. They was saved from a homepage via a browser (Don't know witch because i use four different) to my harddesk.

I tried to find the original pictures, but now they are jpg's not bmp's. sorry.
 [2004-12-02 13:36 UTC] pajoye@php.net 
The fact is you will not be able to read these images without using another libpng (1.0.6 and later), compiled with:
   #define PNG_SETJMP_NOT_SUPPORTED
   #define PNG_ABORT()

The png files are not valid.

The fix will be to change the error to a warning and return false.

--Pierre
 [2005-01-24 09:46 UTC] pajoye@php.net 
Not a developer issue. Fix your image conversion tool.


--Pierre
 [2005-01-24 14:24 UTC] hkh at netnords dot dk 
Maybe the png files not are valid, but still PHP should not crash according to the manual who ways "returns an empty string on failure."
 
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