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diff --git a/deps/libchdr/deps/zstd-1.5.5/tests/gzip/trailing-nul.sh b/deps/libchdr/deps/zstd-1.5.5/tests/gzip/trailing-nul.sh
new file mode 100644
index 00000000..b33b98f7
--- /dev/null
+++ b/deps/libchdr/deps/zstd-1.5.5/tests/gzip/trailing-nul.sh
@@ -0,0 +1,37 @@
+#!/bin/sh
+# gzip accepts trailing NUL bytes; don't fail if there is exactly one.
+# Before gzip-1.4, this would fail.
+
+# Copyright (C) 2009-2016 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+# limit so don't run it by default.
+
+. "${srcdir=.}/init.sh"; path_prepend_ .
+
+(echo 0 | gzip; printf '\0') > 0.gz || framework_failure_
+(echo 00 | gzip; printf '\0\0') > 00.gz || framework_failure_
+(echo 1 | gzip; printf '\1') > 1.gz || framework_failure_
+
+fail=0
+
+for i in 0 00 1; do
+  gzip -d $i.gz; ret=$?
+  test $ret -eq $i || fail=1
+  test $ret = 1 && continue
+  echo $i > exp || fail=1
+  compare exp $i || fail=1
+done
+
+Exit $fail