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ref:cde9a383711a11544ce7e107a78147fb96cc4029

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diff --git a/contrib/libs/hyperscan/src/nfagraph/ng_utf8.h b/contrib/libs/hyperscan/src/nfagraph/ng_utf8.h
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+/*
+ * Copyright (c) 2015-2017, Intel Corporation
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *  * Neither the name of Intel Corporation nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** \file
+ * \brief UTF-8 transforms and operations.
+ */
+
+#ifndef NG_UTF8_H
+#define NG_UTF8_H
+
+namespace ue2 {
+
+class ExpressionInfo;
+class NGHolder;
+
+/** \brief Relax forbidden UTF-8 sequences.
+ *
+ * Some byte sequences can not appear in valid UTF-8 as they encode code points
+ * above \\x{10ffff} or they represent overlong encodings. As we require valid
+ * UTF-8 input, we have no defined behaviour in these cases, as a result we can
+ * accept them if it simplifies the graph. */
+void relaxForbiddenUtf8(NGHolder &g, const ExpressionInfo &expr);
+
+/** \brief Contract cycles of UTF-8 code points down to a single cyclic vertex
+ * where possible, based on the assumption that we will always be matching
+ * against well-formed input.
+ */
+void utf8DotRestoration(NGHolder &h, bool som);
+
+} // namespace ue2
+
+#endif