Re: Why is it that png files are not dependable over the long haul

Nice :)
https://drive.google.com/file/d/1THXAybb6U8PeYIfJsN2CzELBmt-wXG3L/view?usp=sharing
They're not broken.

add

>     png_set_option(png_ptr,
>         PNG_MAXIMUM_INFLATE_WINDOW,
>         PNG_OPTION_ON);

to decoding.

On Mon, Aug 6, 2018 at 12:35 AM Ruben Safir <ruben-v1XHP5QhJixWk0Htik3J/[email protected]> wrote:

> On 08/05/2018 11:36 PM, Cosmin Truta wrote:
> > On Thu, 2 Aug 2018 at 02:37, J Decker wrote:
> >> Experimenting with the chromium modified zlib, I found a flag
> INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
> >
> > That's in the original zlib, also. But you don't need it.
> >
> > What you need is the following libpng function call:
> >
> >     png_set_option(png_ptr,
> >         PNG_MAXIMUM_INFLATE_WINDOW,
> >         PNG_OPTION_ON);
> >
> > See the libpng manual for details.
> >
> > To conclude the story from my previous email:
> >
> > If PNG_MAXIMUM_INFLATE_WINDOW is set to PNG_OPTION_OFF (i.e. the
> > default), libpng can diagnose the error, but not recover from it.
> > Conversely, if PNG_MAXIMUM_INFLATE_WINDOW is set to PNG_OPTION_ON,
> > libpng can decode the image, but not know that the image had an error.
> > It's an either/or proposition, unfortunately.
> >
> > Sincerely,
> > Cosmin
> >
>
> Am I going to be able to recover these image files?
>
> Ruben
>
>
>
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