John Bowler cfc19ff1b6 pngcp bug fixes ...

The fixed size buffer for the file name being processed could have a byte
written beyond the end; a bug where the test was updated without changing the
size of the buffer.  This commit reduces the buffer to the system maximum.

png_getrowbytes could, in theory, return 0; probably only if there is a bug in
libpng but the code now checks.

Signed-off-by: John Bowler <jbowler@acm.org>

2016-07-03 13:49:36 -07:00

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