John Bowler 1afbb57994 IDAT read buffering correction ...

The sequential read code failed to read to the end of the IDAT stream in about
1/820 cases, resulting in a spurious warning.  The
png_set_compression_buffer_size API also would not work (or do bad things) if
the size of a zlib uInt was less than 32 bits.

This includes a quiet API change to alter png_set_compression_buffer_size to use
a png_alloc_size_t, not png_size_t and implement the correct checks.

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

2016-01-10 13:51:29 -08:00

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