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annotate OrthancFramework/Sources/HttpServer/CStringMatcher.cpp @ 4984:c8cdf5163cd2

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author Alain Mazy <am@osimis.io>
date Mon, 25 Apr 2022 18:54:45 +0200
parents 43e613a7756b
children 0ea402b4d901
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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) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #include "../PrecompiledHeaders.h"
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25 #include "CStringMatcher.h"
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26
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27 #include "../OrthancException.h"
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28
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29 #include <boost/algorithm/searching/boyer_moore.hpp>
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30
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31 namespace Orthanc
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32 {
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33 class CStringMatcher::Search : public boost::noncopyable
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34 {
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35 private:
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36 typedef boost::algorithm::boyer_moore<const char*> Algorithm;
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37
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38 Algorithm algorithm_;
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39
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40 public:
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41 // WARNING - The lifetime of "pattern_" must be larger than
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42 // "search_", as the latter internally keeps a pointer to "pattern" (*)
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43 explicit Search(const std::string& pattern) :
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44 algorithm_(pattern.c_str(), pattern.c_str() + pattern.size())
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45 {
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46 }
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47
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48 const char* Apply(const char* start,
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49 const char* end) const
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50 {
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51 #if BOOST_VERSION >= 106200
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52 return algorithm_(start, end).first;
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53 #else
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54 return algorithm_(start, end);
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55 #endif
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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
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61 CStringMatcher::CStringMatcher(const std::string& pattern) :
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62 pattern_(pattern),
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63 valid_(false),
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64 matchBegin_(NULL),
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65 matchEnd_(NULL)
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66 {
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67 // WARNING - Don't use "pattern" (local variable, will be
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68 // destroyed once exiting the constructor) but "pattern_"
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69 // (variable member, will last as long as the algorithm),
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70 // otherwise lifetime is bad! (*)
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71 search_.reset(new Search(pattern_));
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72 }
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73
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74 const std::string& CStringMatcher::GetPattern() const
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75 {
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76 return pattern_;
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77 }
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78
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79 bool CStringMatcher::IsValid() const
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80 {
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81 return valid_;
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82 }
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83
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84
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85 bool CStringMatcher::Apply(const char* start,
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86 const char* end)
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87 {
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88 assert(search_.get() != NULL);
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89
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90 if (start > end)
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91 {
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92 throw OrthancException(ErrorCode_ParameterOutOfRange);
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93 }
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94
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95 matchBegin_ = search_->Apply(start, end);
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96
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97 if (matchBegin_ == end)
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98 {
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99 valid_ = false;
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100 }
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101 else
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102 {
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103 matchEnd_ = matchBegin_ + pattern_.size();
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104 assert(matchEnd_ <= end);
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105 valid_ = true;
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106 }
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107
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108 return valid_;
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109 }
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110
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111
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112 bool CStringMatcher::Apply(const std::string& corpus)
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113 {
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114 if (corpus.empty())
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115 {
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116 return false;
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117 }
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118 else
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119 {
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120 return Apply(corpus.c_str(), corpus.c_str() + corpus.size());
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121 }
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122 }
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123
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124
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125 const char* CStringMatcher::GetMatchBegin() const
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126 {
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127 if (valid_)
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128 {
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129 return matchBegin_;
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130 }
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131 else
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132 {
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133 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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134 }
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135 }
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136
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137
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138 const char* CStringMatcher::GetMatchEnd() const
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139 {
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140 if (valid_)
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141 {
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142 return matchEnd_;
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143 }
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144 else
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145 {
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146 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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147 }
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148 }
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149 }