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diff --git a/deps/libchdr/deps/zstd-1.5.5/tests/gzip/mixed.sh b/deps/libchdr/deps/zstd-1.5.5/tests/gzip/mixed.sh
new file mode 100644
index 00000000..b47f4a56
--- /dev/null
+++ b/deps/libchdr/deps/zstd-1.5.5/tests/gzip/mixed.sh
@@ -0,0 +1,68 @@
+#!/bin/sh
+# Ensure that gzip -cdf handles mixed compressed/not-compressed data
+# Before gzip-1.5, it would produce invalid output.
+
+# Copyright (C) 2010-2016 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.
+
+. "${srcdir=.}/init.sh"; path_prepend_ .
+
+printf 'xxx\nyyy\n'      > exp2 || framework_failure_
+printf 'aaa\nbbb\nccc\n' > exp3 || framework_failure_
+
+fail=0
+
+(echo xxx; echo yyy) > in || fail=1
+gzip -cdf < in > out || fail=1
+compare exp2 out || fail=1
+
+# Uncompressed input, followed by compressed data.
+# Currently fails, so skip it.
+# (echo xxx; echo yyy|gzip) > in || fail=1
+# gzip -cdf < in > out || fail=1
+# compare exp2 out || fail=1
+
+# Compressed input, followed by regular (not-compressed) data.
+(echo xxx|gzip; echo yyy) > in || fail=1
+gzip -cdf < in > out || fail=1
+compare exp2 out || fail=1
+
+(echo xxx|gzip; echo yyy|gzip) > in || fail=1
+gzip -cdf < in > out || fail=1
+compare exp2 out || fail=1
+
+in_str=0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-+=%
+for i in 0 1 2 3 4 5 6 7 8 9 a; do in_str="$in_str$in_str" ;done
+
+# Start with some small sizes.  $(seq 64)
+sizes=$(i=0; while :; do echo $i; test $i = 64 && break; i=$(expr $i + 1); done)
+
+# gzip's internal buffer size is 32KiB + 64 bytes:
+sizes="$sizes 32831 32832 32833"
+
+# 128KiB, +/- 1
+sizes="$sizes 131071 131072 131073"
+
+# Ensure that "gzip -cdf" acts like cat, for a range of small input files.
+i=0
+for i in $sizes; do
+  echo $i
+  printf %$i.${i}s $in_str > in
+  gzip -cdf < in > out
+  compare in out || fail=1
+done
+
+Exit $fail