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diff --git a/src/3rdparty/libtiff/libtiff/tif_hash_set.h b/src/3rdparty/libtiff/libtiff/tif_hash_set.h
new file mode 100644
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+++ b/src/3rdparty/libtiff/libtiff/tif_hash_set.h
@@ -0,0 +1,100 @@
+/**********************************************************************
+ * $Id$
+ *
+ * Name:     tif_hash_set.h
+ * Project:  TIFF - Common Portability Library
+ * Purpose:  Hash set functions.
+ * Author:   Even Rouault, <even dot rouault at spatialys.com>
+ *
+ **********************************************************************
+ * Copyright (c) 2008-2009, Even Rouault <even dot rouault at spatialys.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ ****************************************************************************/
+
+#ifndef TIFF_HASH_SET_H_INCLUDED
+#define TIFF_HASH_SET_H_INCLUDED
+
+#include <stdbool.h>
+
+/**
+ * \file tif_hash_set.h
+ *
+ * Hash set implementation.
+ *
+ * An hash set is a data structure that holds elements that are unique
+ * according to a comparison function. Operations on the hash set, such as
+ * insertion, removal or lookup, are supposed to be fast if an efficient
+ * "hash" function is provided.
+ */
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    /* Types */
+
+    /** Opaque type for a hash set */
+    typedef struct _TIFFHashSet TIFFHashSet;
+
+    /** TIFFHashSetHashFunc */
+    typedef unsigned long (*TIFFHashSetHashFunc)(const void *elt);
+
+    /** TIFFHashSetEqualFunc */
+    typedef bool (*TIFFHashSetEqualFunc)(const void *elt1, const void *elt2);
+
+    /** TIFFHashSetFreeEltFunc */
+    typedef void (*TIFFHashSetFreeEltFunc)(void *elt);
+
+    /* Functions */
+
+    TIFFHashSet *TIFFHashSetNew(TIFFHashSetHashFunc fnHashFunc,
+                                TIFFHashSetEqualFunc fnEqualFunc,
+                                TIFFHashSetFreeEltFunc fnFreeEltFunc);
+
+    void TIFFHashSetDestroy(TIFFHashSet *set);
+
+#ifdef notused
+    void TIFFHashSetClear(TIFFHashSet *set);
+
+    int TIFFHashSetSize(const TIFFHashSet *set);
+
+    /** TIFFHashSetIterEltFunc */
+    typedef int (*TIFFHashSetIterEltFunc)(void *elt, void *user_data);
+
+    void TIFFHashSetForeach(TIFFHashSet *set, TIFFHashSetIterEltFunc fnIterFunc,
+                            void *user_data);
+#endif
+
+    bool TIFFHashSetInsert(TIFFHashSet *set, void *elt);
+
+    void *TIFFHashSetLookup(TIFFHashSet *set, const void *elt);
+
+    bool TIFFHashSetRemove(TIFFHashSet *set, const void *elt);
+
+#ifdef notused
+    bool TIFFHashSetRemoveDeferRehash(TIFFHashSet *set, const void *elt);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* TIFF_HASH_SET_H_INCLUDED */