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77 lines
3.2 KiB
C
77 lines
3.2 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 NFA Callback definitions, used at runtime.
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*/
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#ifndef NFA_CALLBACK_H
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#define NFA_CALLBACK_H
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#include "ue2common.h"
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/** \brief The type for an NFA callback.
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*
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* This is a function that takes as arguments the current offset where the
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* match occurs, the id of the match and the context pointer that was passed
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* into the NFA API function that executed the NFA.
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*
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* The offset where the match occurs will be the offset after the character
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* that caused the match. Thus, if we have a buffer containing 'abc', then a
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* pattern that matches an empty string will have an offset of 0, a pattern
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* that matches 'a' will have an offset of 1, and a pattern that matches 'abc'
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* will have an offset of 3, which will be a value that is 'beyond' the size of
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* the buffer. That is, if we have n characters in the buffer, there are n+1
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* different potential offsets for matches.
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*
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* This function should return an int - currently the possible return values
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* are 0, which means 'stop running the engine' or non-zero, which means
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* 'continue matching'.
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*/
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typedef int (*NfaCallback)(u64a offset, ReportID id, void *context);
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/** \brief The type for an NFA callback which also tracks start of match.
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*
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* see \ref NfaCallback
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*/
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typedef int (*SomNfaCallback)(u64a from_offset, u64a to_offset, ReportID id,
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void *context);
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/**
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* standard \ref NfaCallback return value indicating that engine execution
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* should continue. (any non-zero value will serve this purpose)
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*/
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#define MO_CONTINUE_MATCHING 1
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/**
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* \ref NfaCallback return value indicating that engine execution should halt.
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*/
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#define MO_HALT_MATCHING 0
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#endif // NFA_CALLBACK_H
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