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annotate OrthancFramework/Sources/HttpServer/CStringMatcher.cpp @ 4652:0ad5736c8d62

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use plain C strings in MultipartStreamReader instead of std::string to allow further optimizations
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 05 May 2021 11:50:14 +0200
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children e8967149d87a
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4652
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2021 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #include "../PrecompiledHeaders.h"
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24 #include "CStringMatcher.h"
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25
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26 #include "../OrthancException.h"
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27
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28 #include <boost/algorithm/searching/boyer_moore.hpp>
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29
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30 namespace Orthanc
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31 {
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32 class CStringMatcher::Search : public boost::noncopyable
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33 {
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34 private:
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35 typedef boost::algorithm::boyer_moore<const char*> Algorithm;
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36
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37 Algorithm algorithm_;
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38
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39 public:
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40 // WARNING - The lifetime of "pattern_" must be larger than
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41 // "search_", as the latter internally keeps a pointer to "pattern" (*)
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42 explicit Search(const std::string& pattern) :
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43 algorithm_(pattern.c_str(), pattern.c_str() + pattern.size())
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44 {
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45 }
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46
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47 const char* Apply(const char* start,
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48 const char* end) const
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49 {
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50 #if BOOST_VERSION >= 106200
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51 return algorithm_(start, end).first;
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52 #else
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53 return algorithm_(start, end);
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54 #endif
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55 }
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56 };
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57
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58
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59
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60 CStringMatcher::CStringMatcher(const std::string& pattern) :
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61 pattern_(pattern),
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62 valid_(false)
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63 {
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64 // WARNING - Don't use "pattern" (local variable, will be
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65 // destroyed once exiting the constructor) but "pattern_"
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66 // (variable member, will last as long as the algorithm),
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67 // otherwise lifetime is bad! (*)
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68 search_.reset(new Search(pattern_));
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69 }
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70
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71 const std::string& CStringMatcher::GetPattern() const
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72 {
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73 return pattern_;
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74 }
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75
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76 bool CStringMatcher::IsValid() const
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77 {
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78 return valid_;
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79 }
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80
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81
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82 bool CStringMatcher::Apply(const char* start,
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83 const char* end)
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84 {
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85 assert(search_.get() != NULL);
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86
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87 if (start > end)
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88 {
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89 throw OrthancException(ErrorCode_ParameterOutOfRange);
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90 }
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91
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92 matchBegin_ = search_->Apply(start, end);
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93
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94 if (matchBegin_ == end)
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95 {
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96 valid_ = false;
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97 }
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98 else
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99 {
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100 matchEnd_ = matchBegin_ + pattern_.size();
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101 assert(matchEnd_ <= end);
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102 valid_ = true;
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103 }
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104
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105 return valid_;
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106 }
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107
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108
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109 bool CStringMatcher::Apply(const std::string& corpus)
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110 {
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111 if (corpus.empty())
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112 {
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113 return false;
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114 }
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115 else
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116 {
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117 return Apply(corpus.c_str(), corpus.c_str() + corpus.size());
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118 }
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119 }
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120
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121
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122 const char* CStringMatcher::GetMatchBegin() const
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123 {
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124 if (valid_)
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125 {
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126 return matchBegin_;
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127 }
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128 else
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129 {
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130 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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131 }
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132 }
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133
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134
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135 const char* CStringMatcher::GetMatchEnd() const
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136 {
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137 if (valid_)
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138 {
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139 return matchEnd_;
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140 }
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141 else
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142 {
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143 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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144 }
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145 }
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146 }