1/*
2 * Copyright (c) 2015-2017, Intel Corporation
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * * Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of Intel Corporation nor the names of its contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** \file
30 * \brief UTF-8 transforms and operations.
31 */
32
33#ifndef NG_UTF8_H
34#define NG_UTF8_H
35
36namespace ue2 {
37
38class ExpressionInfo;
39class NGHolder;
40
41/** \brief Relax forbidden UTF-8 sequences.
42 *
43 * Some byte sequences can not appear in valid UTF-8 as they encode code points
44 * above \\x{10ffff} or they represent overlong encodings. As we require valid
45 * UTF-8 input, we have no defined behaviour in these cases, as a result we can
46 * accept them if it simplifies the graph. */
47void relaxForbiddenUtf8(NGHolder &g, const ExpressionInfo &expr);
48
49/** \brief Contract cycles of UTF-8 code points down to a single cyclic vertex
50 * where possible, based on the assumption that we will always be matching
51 * against well-formed input.
52 */
53void utf8DotRestoration(NGHolder &h, bool som);
54
55} // namespace ue2
56
57#endif
58