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/*
* Copyright (c) 2015-2017, 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 Shufti acceleration: compile code.
*/
#ifndef SHUFTI_COMPILE_H
#define SHUFTI_COMPILE_H
#include "ue2common.h"
#include "util/charreach.h"
#include "util/flat_containers.h"
#include <utility>
namespace ue2 {
/** \brief Single-byte variant.
*
* Returns -1 if unable to construct masks, otherwise returns number of bits
* used in the mask.
*
* Note: always able to construct masks for 8 or fewer characters.
*/
int shuftiBuildMasks(const CharReach &chars, u8 *lo, u8 *hi);
/** \brief Double-byte variant
*
* Returns false if we are unable to build the masks (too many buckets required)
*/
bool shuftiBuildDoubleMasks(const CharReach &onechar,
const flat_set<std::pair<u8, u8>> &twochar,
u8 *lo1, u8 *hi1, u8 *lo2, u8 *hi2);
#ifdef DUMP_SUPPORT
/**
* \brief Dump code: returns a CharReach with the reach that would match this
* shufti.
*/
CharReach shufti2cr(const u8 *lo, const u8 *hi);
#endif // DUMP_SUPPORT
} // namespace ue2
#endif // SHUFTI_COMPILE_H
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