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diff --git a/libmariadb/external/zlib/inffast_chunk.h b/libmariadb/external/zlib/inffast_chunk.h
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+++ b/libmariadb/external/zlib/inffast_chunk.h
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+/* inffast_chunk.h -- header to use inffast_chunk.c
+ *
+ * (C) 1995-2013 Jean-loup Gailly and Mark Adler
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ *
+ * Jean-loup Gailly        Mark Adler
+ * jloup@gzip.org          madler@alumni.caltech.edu
+ *
+ * Copyright (C) 1995-2003, 2010 Mark Adler
+ * Copyright (C) 2017 ARM, Inc.
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* WARNING: this file should *not* be used by applications. It is
+   part of the implementation of the compression library and is
+   subject to change. Applications should only use zlib.h.
+ */
+
+#include "inffast.h"
+
+/* INFLATE_FAST_MIN_INPUT: the minimum number of input bytes needed so that
+   we can safely call inflate_fast() with only one up-front bounds check. One
+   length/distance code pair (15 bits for the length code, 5 bits for length
+   extra, 15 bits for the distance code, 13 bits for distance extra) requires
+   reading up to 48 input bits (6 bytes). The wide input data reading option
+   requires a little endian machine, and reads 64 input bits (8 bytes).
+*/
+#ifdef INFLATE_CHUNK_READ_64LE
+#undef INFLATE_FAST_MIN_INPUT
+#define INFLATE_FAST_MIN_INPUT 8
+#endif
+
+void ZLIB_INTERNAL inflate_fast_chunk_ OF((z_streamp strm, unsigned start));