1/*
2 * Copyright (c) 2015, 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
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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 Reverse acceleration analysis.
31 */
32
33#ifndef NG_REVACC_H
34#define NG_REVACC_H
35
36#include "util/charreach.h"
37
38#include <vector>
39
40struct NFA;
41
42namespace ue2 {
43
44class NGHolder;
45
46#define MAX_RACCEL_OFFSET 16
47
48struct RevAccInfo {
49 RevAccInfo(void);
50 bool valid;
51 std::vector<CharReach> acceptReach; /**< bytes which can appear n
52 * bytes before a match */
53 std::vector<CharReach> acceptEodReach; /**< bytes which can appear n
54 * bytes before eod match */
55};
56
57void buildReverseAcceleration(struct NFA *nfa, const RevAccInfo &rev_info,
58 u32 min_width, bool eod_only = false);
59
60void populateReverseAccelerationInfo(RevAccInfo &rai, const NGHolder &g);
61void mergeReverseAccelerationInfo(RevAccInfo &dest, const RevAccInfo &vic);
62
63} // namespace ue2
64
65#endif
66