Re: Endless loop in version 1.6.26

The same change breaks the 1.7 API to control how IDAT errors are
handled.  Prior to the change the app could control whether to ignore
them and get a potentially corrupted but still usable image (1.7 fills
in the unreadable data to counter security issues) or to error out.

With the change the error-out option no longer works for changes to
the zlib stream which change the image but don't invalidate the steam.
There are quite a lot of such changes!

I don't see why it was necessary to duplicate functionality which
already exists; libpng 1.7 an already ignore detectable errors in the
zlib stream, why change the behavior in the case where it isn't doing
this?

Not only that, but I can't see how this behavior can be switched
*off*; it is an unconditional removal of a security feature for all
applications of libpng.  That has to be wrong.

John Bowler

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