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[libpng15] Fixed FP division by zero in pngvalid.c; the 'test_pixel' code left

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the sBIT fields in the test pixel as 0, which resulted in a floating
point division by zero which was irrelevant but causes systems where
FP exceptions cause a crash. Added code to pngvalid to turn on FP
exceptions if the appropriate glibc support is there to ensure this is
tested in the future.
This commit is contained in:
John Bowler
2011-11-04 20:24:56 -05:00
committed by Glenn Randers-Pehrson
parent 88bcdc269b
commit a004e23a4c
4 changed files with 135 additions and 8 deletions
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@@ -3692,6 +3692,12 @@ Version 1.5.7beta02 [November 5, 2011]
be non-NULL. The cast of the profile length potentially truncated the
value unnecessarily on a 16-bit int system, so the cast of the (byte)
compression type to (int) is specified by ANSI-C anyway.
Fixed FP division by zero in pngvalid.c; the 'test_pixel' code left
the sBIT fields in the test pixel as 0, which resulted in a floating
point division by zero which was irrelevant but causes systems where
FP exceptions cause a crash. Added code to pngvalid to turn on FP
exceptions if the appropriate glibc support is there to ensure this is
tested in the future.
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