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https://github.com/VectorCamp/vectorscan.git
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99 lines
3.4 KiB
C
99 lines
3.4 KiB
C
/*
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* Copyright (c) 2015, Intel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/** \file
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* \brief Inline functions for manipulating exhaustion vector.
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*/
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#ifndef EXHAUST_H
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#define EXHAUST_H
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#include "rose/rose_internal.h"
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#include "ue2common.h"
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#include <string.h>
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/** \brief Sentinel value meaning no further exhaustion keys. */
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#define END_EXHAUST (~(u32)0)
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/** \brief Test whether the given key (\a eoff) is set in the exhaustion vector
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* \a evec. */
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static really_inline
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int isExhausted(const char *evec, u32 eoff) {
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DEBUG_PRINTF("checking exhaustion %p %u\n", evec, eoff);
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return eoff != END_EXHAUST && (evec[eoff >> 3] & (1 << (eoff % 8)));
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}
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/** \brief Returns 1 if all exhaustion keys in the bitvector are on. */
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static really_inline
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int isAllExhausted(const struct RoseEngine *t, const char *evec_in) {
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if (!t->canExhaust) {
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return 0; /* pattern set is inexhaustible */
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}
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const u8 *evec = (const u8 *)evec_in;
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u32 whole_bytes = t->ekeyCount / 8;
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for (u32 i = 0; i < whole_bytes; i++) {
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if (evec[i] != 0xff) {
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DEBUG_PRINTF("unexhausted pattern in byte %u\n", i);
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return 0;
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}
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}
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u32 rem = t->ekeyCount % 8;
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if (t->ekeyCount % 8) {
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u8 mask = (1 << rem) - 1;
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if (evec[whole_bytes] != (char)mask) {
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DEBUG_PRINTF("unexhausted pattern (%hhu) in final byte\n", mask);
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return 0;
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}
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}
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DEBUG_PRINTF("pattern set is exhausted\n");
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return 1;
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}
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/** \brief Mark key \a eoff on in the exhaustion vector. */
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static really_inline
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void markAsMatched(char *evec, u32 eoff) {
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if (eoff != END_EXHAUST) {
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DEBUG_PRINTF("marking as exhausted key %u\n", eoff);
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evec[eoff >> 3] |= 1 << (eoff % 8);
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}
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}
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/** \brief Clear all keys in the exhaustion vector. */
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static really_inline
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void clearEvec(char *ev, const struct RoseEngine *t) {
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size_t size = (t->ekeyCount + 7) / 8;
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DEBUG_PRINTF("clearing evec %p %zu\n", ev, size);
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memset(ev, 0, size);
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}
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#endif
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