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23e5f06594
Design compile time api hs_compile_lit() and hs_compile_lit_multi() to handle pure literal pattern sets. Corresponding option --literal-on is added for hyperscan testing suites. Extended parameters and part of flags are not supported for this api.
118 lines
4.3 KiB
C++
118 lines
4.3 KiB
C++
/*
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* Copyright (c) 2015-2019, 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 Hamster Wheel Literal Matcher: literal representation at build time.
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*/
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#include "hwlm_literal.h"
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#include "util/bitutils.h" // for CASE_BIT
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#include "util/compare.h" // for ourisalpha
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#include "util/ue2string.h" // for escapeString
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#include <algorithm>
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#include <iomanip>
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#include <sstream>
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using namespace std;
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namespace ue2 {
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#ifdef DEBUG
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static UNUSED
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std::string dumpMask(const vector<u8> &v) {
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ostringstream oss;
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vector<u8>::const_iterator it, ite;
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for (it = v.begin(), ite = v.end(); it != ite; ++it) {
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oss << setfill('0') << setw(2) << hex << (unsigned int)*it;
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}
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return oss.str();
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}
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#endif
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bool maskIsConsistent(const std::string &s, bool nocase, const vector<u8> &msk,
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const vector<u8> &cmp) {
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string::const_reverse_iterator si = s.rbegin();
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vector<u8>::const_reverse_iterator mi = msk.rbegin(), ci = cmp.rbegin();
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for (; si != s.rend() && mi != msk.rend(); ++si, ++mi, ++ci) {
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u8 c = *si, m = *mi, v = *ci;
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if (nocase && ourisalpha(c)) {
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m &= ~CASE_BIT;
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v &= ~CASE_BIT;
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}
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assert(ci != cmp.rend());
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if ((c & m) != v) {
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DEBUG_PRINTF("c = %02hhx; *ci = %02hhx m =%02hhx\n", c, *ci, m);
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DEBUG_PRINTF("s = %s; dist = %zd\n", s.c_str(), si - s.rbegin());
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return false;
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}
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}
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return true;
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}
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/** \brief Complete constructor, takes group information and msk/cmp.
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*
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* This constructor takes a msk/cmp pair. Both must be vectors of length <=
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* \ref HWLM_MASKLEN. */
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hwlmLiteral::hwlmLiteral(const std::string &s_in, bool nocase_in,
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bool noruns_in, u32 id_in, hwlm_group_t groups_in,
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const vector<u8> &msk_in, const vector<u8> &cmp_in)
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: s(s_in), id(id_in), nocase(nocase_in), noruns(noruns_in),
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groups(groups_in), msk(msk_in), cmp(cmp_in) {
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assert(s.size() <= HWLM_LITERAL_MAX_LEN);
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assert(msk.size() <= HWLM_MASKLEN);
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assert(msk.size() == cmp.size());
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// If we've been handled a nocase literal, all letter characters must be
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// upper-case.
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if (nocase) {
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upperString(s);
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}
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DEBUG_PRINTF("literal '%s'%s, msk=%s, cmp=%s\n", escapeString(s).c_str(),
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nocase ? " (nocase)" : "", dumpMask(msk).c_str(),
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dumpMask(cmp).c_str());
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// Mask and compare vectors MUST be the same size.
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assert(msk.size() == cmp.size());
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// We must have been passed a msk/cmp that can be applied to s.
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assert(maskIsConsistent(s, nocase, msk, cmp));
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// In the name of good hygiene, zap msk/cmp if msk is all zeroes.
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if (all_of(begin(msk), end(msk), [](u8 val) { return val == 0; })) {
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msk.clear();
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cmp.clear();
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}
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}
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} // namespace ue2
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