John Bowler ec89aefb44 [libpng17] Changed user chunk callback API to respect global and per chunk ...

defaults.  Previously a return of 0 from a user chunk callback would result in
the chunk being saved (if this was safe, even if the chunk was unsafe-to-copy);
this change respects the defaults set by the application, so unknown chunks
can be discarded by default and known-safe ones preserved.

2013-03-02 21:39:44 -06:00

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