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 | |
40 | struct NFA; |
41 | |
42 | namespace ue2 { |
43 | |
44 | class NGHolder; |
45 | |
46 | #define MAX_RACCEL_OFFSET 16 |
47 | |
48 | struct 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 | |
57 | void buildReverseAcceleration(struct NFA *nfa, const RevAccInfo &rev_info, |
58 | u32 min_width, bool eod_only = false); |
59 | |
60 | void populateReverseAccelerationInfo(RevAccInfo &rai, const NGHolder &g); |
61 | void mergeReverseAccelerationInfo(RevAccInfo &dest, const RevAccInfo &vic); |
62 | |
63 | } // namespace ue2 |
64 | |
65 | #endif |
66 | |