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/*
* Copyright (c) 2015, 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 Reverse acceleration analysis.
*/
#ifndef NG_REVACC_H
#define NG_REVACC_H
#include "util/charreach.h"
#include <vector>
struct NFA;
namespace ue2 {
class NGHolder;
#define MAX_RACCEL_OFFSET 16
struct RevAccInfo {
RevAccInfo(void);
bool valid;
std::vector<CharReach> acceptReach; /**< bytes which can appear n
* bytes before a match */
std::vector<CharReach> acceptEodReach; /**< bytes which can appear n
* bytes before eod match */
};
void buildReverseAcceleration(struct NFA *nfa, const RevAccInfo &rev_info,
u32 min_width, bool eod_only = false);
void populateReverseAccelerationInfo(RevAccInfo &rai, const NGHolder &g);
void mergeReverseAccelerationInfo(RevAccInfo &dest, const RevAccInfo &vic);
} // namespace ue2
#endif
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