[Reproducible-commits] [strip-nondeterminism] 02/08: handlers/png: Warn if file contains garbage after IEND header

[Chris Lamb]

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lamby pushed a commit to branch debian
in repository strip-nondeterminism.

commit 86f49c7358624b1242087e16410f692966c4def1
Author: Chris Lamb <lamby at debian.org>
Date:   Sun Jul 24 15:26:25 2016 +0100

    handlers/png: Warn if file contains garbage after IEND header
---
 lib/File/StripNondeterminism/handlers/png.pm | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/File/StripNondeterminism/handlers/png.pm b/lib/File/StripNondeterminism/handlers/png.pm
index 780258d..44700e2 100644
--- a/lib/File/StripNondeterminism/handlers/png.pm
+++ b/lib/File/StripNondeterminism/handlers/png.pm
@@ -137,11 +137,15 @@ sub _normalize {
 	# Copy through trailing garbage.  Conformant PNG files don't have trailing
 	# garbage (see http://www.w3.org/TR/PNG/#15FileConformance item c), however
 	# in the interest of strip-nondeterminism being as transparent as possible,
-	# we preserve the garbage.
+	# we preserve the garbage.(#802057)
+	my $garbage = 0;
 	while ($bytes_read = read($fh, $buf, 4096)) {
 		print $tempfile $buf;
+		$garbage += $bytes_read;
 	}
 	defined($bytes_read) or die "$filename: read failed: $!";
+	warn "$filename: $garbage bytes of garbage after IEND chunk"
+		if $garbage > 0;
 
 	return $modified;
 }

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