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Also add an example program, pngcp.c, which illustrates the problem when used to copy pngtest.png (the result is an invalid PNG because the tIME chunk is duplicated.) Signed-off-by: John Bowler <jbowler@acm.org>
This "contrib" directory contains contributions which are not necessarily under the libpng license, although all are open source. They are not part of libpng proper and are not used for building the library, although some are used for testing the library via "make check".