vectorscan/src/nfa/multiaccel_compilehelper.h
2016-03-01 11:21:39 +11:00

76 lines
2.6 KiB
C++

/*
* 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.
*/
#ifndef MULTIACCELCOMPILE_H_
#define MULTIACCELCOMPILE_H_
#include "ue2common.h"
#include "nfagraph/ng_limex_accel.h"
#include <vector>
namespace ue2 {
/* accel scheme state machine */
enum accel_scheme_state {
STATE_FIRST_RUN,
STATE_SECOND_RUN,
STATE_WAITING_FOR_GRAB,
STATE_FIRST_TAIL,
STATE_SECOND_TAIL,
STATE_STOPPED,
STATE_INVALID
};
struct accel_data {
MultibyteAccelInfo::multiaccel_type type = MultibyteAccelInfo::MAT_NONE;
accel_scheme_state state = STATE_INVALID;
unsigned len1 = 0; /* length of first run */
unsigned len2 = 0; /* length of second run, if present */
unsigned tlen1 = 0; /* first tail length */
unsigned tlen2 = 0; /* second tail length */
};
class MultiaccelCompileHelper {
private:
const CharReach &cr;
u32 offset;
std::vector<accel_data> accels;
unsigned max_len;
public:
MultiaccelCompileHelper(const CharReach &cr, u32 off, unsigned max_len);
bool canAdvance();
MultibyteAccelInfo getBestScheme();
void advance(const ue2::CharReach &cr);
};
}; // namespace
#endif /* MULTIACCELCOMPILE_H_ */