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diff --git a/lib/dns/tests/mkraw.pl b/lib/dns/tests/mkraw.pl
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+#!/usr/bin/perl -w
+#
+# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+# See the COPYRIGHT file distributed with this work for additional
+# information regarding copyright ownership.
+
+# Convert a hexdump to binary format.
+#
+# To convert binary data to the input format for this command,
+# use the following:
+#
+# perl -e 'while (read(STDIN, my $byte, 1)) {
+# print unpack("H2", $byte);
+# }
+# print "\n";' < file > file.in
+
+use strict;
+chomp(my $line = <STDIN>);
+print pack("H*", $line);