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Bug #6141 GetImageSize cannot recover size of PNGs
Submitted: 2000-08-14 04:48 UTC Modified: 2000-08-17 03:12 UTC
From: b dot tenhumberg at web dot de Assigned:
Status: Closed Package: Misbehaving function
PHP Version: 4.0.1pl2 OS: Linux 2.2.16
Private report: No CVE-ID: None
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From: b dot tenhumberg at web dot de
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 [2000-08-14 04:48 UTC] b dot tenhumberg at web dot de 
GetImageSize calculates the size of GIFs and JPGs correctly, but PNGs aren't identified... Due to that no size can be calculated.
GDLib-Version is 1.7.3

I compiled it static with following parameters:
--with-apache=$APACHEPATH \
           --with-mysql \
           --with-mm \
           --enable-track-vars

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 [2000-08-15 06:47 UTC] stas@php.net 
Failed to reproduce this. Could you provide a link to PNG image that doesn't work?
 [2000-08-16 02:25 UTC] b dot tenhumberg at web dot de 
Maybe it's a installation- or compile-problem.
The problem occurs any time on any PNG-graphic produced with 'xv'.

PHP-Info says:
GD Support              enabled
GD Version              1.6.2 or higher
FreeType Support     enabled
FreeType Linkage     with TTF library
PNG Support            enabled

Following problem goes along with it: After some hours any child-process of apache is terminated with signal 11...
 [2000-08-16 09:46 UTC] b dot tenhumberg at web dot de 
The problem appears after editing the image with 'convert' from Imagemagick.

Sorry!!! Forget this!

BTW: Great stuff!
 [2000-08-16 10:10 UTC] b dot tenhumberg at web dot de 
It seems that PHP needs the 'png' - suffix after 'convert' has modified it.
Maybe it destroys the magic-number of the png-file, so that PHP  looks at the suffix...

Is that true?
 [2000-08-16 10:24 UTC] stas@php.net 
It expects PNG signature there - 
(char) 0x89, (char) 0x50, (char) 0x4e,
(char) 0x47, (char) 0x0d, (char) 0x0a,
(char) 0x1a, (char) 0x0a

What your files have?
 [2000-08-17 03:12 UTC] b dot tenhumberg at web dot de 
OK. Everything's ok with GetImageSize... I was too fast. Sorry.

Now I use these steps of rescaling a file with variable type:
1. Recovering the filetype (jpg, png...)
2. Rescaling: The second filename MUST have the right suffix!
ex: convert -scale 200x200 file.png newfile.png

I've used 'newfile.tmp', so convert made an unuseful file...

Thank You!
 
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