Bug #51556 [NEW]: imagepng,imagegif not function properly

From: Date: Thu, 15 Apr 2010 01:41:01 +0000
Subject: Bug #51556 [NEW]: imagepng,imagegif not function properly
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-149569@lists.php.net to get a copy of this message 
From:             
Operating system: centos5 x86_64 GNU/Linux
PHP version:      6SVN-2010-04-15 (SVN)
Package:          GD related
Bug Type:         Bug
Bug description:imagepng,imagegif not function properly 

Description:
------------
while running as cgi on nginx(the response is 'chunked' according to
firebug), and ob_start is activated using imagepng,imagegif to outputimages
to the browsers, these two are not correct, the browser only received part
of the image, while imagejpeg is correct. And without ob_start or running
as apache+mod_php(response not 'chunked') all three are correct. And if add

'ob_end_clean()' before imagepng, it worked correctly. 

phpinfo:

gd
GD Support 	enabled
GD Version 	bundled (2.0.34 compatible)
FreeType Support 	enabled
FreeType Linkage 	with freetype
FreeType Version 	2.2.1
GIF Read Support 	enabled
GIF Create Support 	enabled
JPG Support 	enabled
PNG Support 	enabled
WBMP Support 	enabled
XBM Support 	enabled 

Test script:
---------------
ob_start();
header('Content-type: image/png');
imagepng(imagecreatefrompng('/home/webroot/a.png'));
//imagegif(imagecreatefrompng('/home/webroot/a.png'));
//imagejpeg(imagecreatefrompng('/home/webroot/a.png'));
exit;

Expected result:
----------------
the image rendered entirely 

Actual result:
--------------
firefox:the image rendered partly 
ie6: imagepng and imagegif behaves more weirdly 

-- 
Edit bug report at http://bugs.php.net/bug.php?id=51556&edit=1
-- 
Try a snapshot (PHP 5.2):            http://bugs.php.net/fix.php?id=51556&r=trysnapshot52
Try a snapshot (PHP 5.3):            http://bugs.php.net/fix.php?id=51556&r=trysnapshot53
Try a snapshot (PHP 6.0):            http://bugs.php.net/fix.php?id=51556&r=trysnapshot60
Fixed in SVN:                        http://bugs.php.net/fix.php?id=51556&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=51556&r=needdocs
Fixed in release:                    http://bugs.php.net/fix.php?id=51556&r=alreadyfixed
Need backtrace:                      http://bugs.php.net/fix.php?id=51556&r=needtrace
Need Reproduce Script:               http://bugs.php.net/fix.php?id=51556&r=needscript
Try newer version:                   http://bugs.php.net/fix.php?id=51556&r=oldversion
Not developer issue:                 http://bugs.php.net/fix.php?id=51556&r=support
Expected behavior:                   http://bugs.php.net/fix.php?id=51556&r=notwrong
Not enough info:                     http://bugs.php.net/fix.php?id=51556&r=notenoughinfo
Submitted twice:                     http://bugs.php.net/fix.php?id=51556&r=submittedtwice
register_globals:                    http://bugs.php.net/fix.php?id=51556&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=51556&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=51556&r=dst
IIS Stability:                       http://bugs.php.net/fix.php?id=51556&r=isapi
Install GNU Sed:                     http://bugs.php.net/fix.php?id=51556&r=gnused
Floating point limitations:          http://bugs.php.net/fix.php?id=51556&r=float
No Zend Extensions:                  http://bugs.php.net/fix.php?id=51556&r=nozend
MySQL Configuration Error:           http://bugs.php.net/fix.php?id=51556&r=mysqlcfg

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