Re: libpng (or zlib?) runtime errors

On 2/5/07, glennrpcomcast.net" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">glennrpcomcast.net < glennrpcomcast.net" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">glennrpcomcast.net> wrote:

Can you provide an image that produces each error, or a URL to locate such images?

Is your PowerPC platform 64-bit?

Glenn

 -------------- Original message ----------------------
From: "Tim Conkling&quot; < tconklinggmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">tconklinggmail.com>
> I've compiled the zlib (version 1.2.3) and libpng (version 1.2.15) libraries
> for a PowerPC platform that I'm developing for (not the Mac). I'm having
&gt; trouble loading PNGs. Some images load fine, but others consistently cause
> the program to abort with one of the following errors:
&gt;
> "libpng error: invalid literal/lengths set"
> "libpng error: IDAT: CRC error";
>
&gt; (It appears that the "invalid literal/lengths set" error is originating in
> zlib, and the CRC error is coming from a CRC check that libpng is
> performing.)
>
>; The images that are causing these errors load and display correctly in a
> Windows application that uses libpng, so I know it's not the images that are
> at fault. Images that *don't* cause my PNG loading code to break tend to be
> very simple (long runs of color).
>
> I don't have the ability to run the .configure script on the platform I'm
&gt; compiling for, so I have to configure third-party libraries by hand. I'm
&gt; compiling libpng with the following flag set in pngconf.h:
>
>; #define PNG_READ_BIG_ENDIAN_SUPPORTED
&gt;
> and I haven't changed anything in zlib's zconf.h.
&gt;
> I'm using my own memory allocation/deallocation and file reading functions,
> and I've been careful to supply them to libpng. They've been tested and are
> used extensively in other areas of my code, so I'm assuming that they're not
> causing these problems.
>
&gt; Any ideas on what might be happening here?
>
> Thanks,
&gt; Tim

---------- Forwarded message ----------
From: ;"Tim Conkling&quot; < tconklinggmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)"> tconklinggmail.com>
To:&nbsp;" png-mng-implementlists.sourceforge.net" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">png-mng-implementlists.sourceforge.net" < png-mng-implementlists.sourceforge.net" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">png-mng-implementlists.sourceforge.net >
Date: Mon, 5 Feb 2007 16:27:33 +0000
Subject: [png-mng-implement] libpng (or zlib?) runtime errors
I&#39;ve compiled the zlib (version 1.2.3) and libpng (version 1.2.15) libraries for a PowerPC platform that I'm developing for (not the Mac). I'm having trouble loading PNGs. Some images load fine, but others consistently cause the program to abort with one of the following errors:

"libpng error: invalid literal/lengths set"
"libpng error: IDAT: CRC error&quot;

(It appears that the "invalid literal/lengths set" error is originating in zlib, and the CRC error is coming from a CRC check that libpng is performing.)

The images that are causing these errors load and display correctly in a Windows application that uses libpng, so I know it's not the images that are at fault. Images that *don't* cause my PNG loading code to break tend to be very simple (long runs of color).

I don't have the ability to run the .configure script on the platform I'm compiling for, so I have to configure third-party libraries by hand. I'm compiling libpng with the following flag set in pngconf.h :

#define PNG_READ_BIG_ENDIAN_SUPPORTED

and I haven't changed anything in zlib's zconf.h.

I'm using my own memory allocation/deallocation and file reading functions, and I've been careful to supply them to libpng. They've been tested and are used extensively in other areas of my code, so I'm assuming that they're not causing these problems.

Any ideas on what might be happening here?

Thanks,
Tim

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Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier.
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&amp;dat=121642

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