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annotate OrthancFramework/Sources/HttpServer/CStringMatcher.cpp @ 5853:4d932683049d get-scu tip

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very first implementation of C-Get SCU
author Alain Mazy <am@orthanc.team>
date Tue, 29 Oct 2024 17:25:49 +0100
parents f7adfb22e20e
children
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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) 2017-2023 Osimis S.A., Belgium
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6 * Copyright (C) 2024-2024 Orthanc Team SRL, Belgium
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7 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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8 *
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9 * This program is free software: you can redistribute it and/or
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10 * modify it under the terms of the GNU Lesser General Public License
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11 * as published by the Free Software Foundation, either version 3 of
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12 * the License, or (at your option) any later version.
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13 *
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14 * This program is distributed in the hope that it will be useful, but
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15 * WITHOUT ANY WARRANTY; without even the implied warranty of
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16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 * Lesser General Public License for more details.
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18 *
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19 * You should have received a copy of the GNU Lesser General Public
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20 * License along with this program. If not, see
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21 * <http://www.gnu.org/licenses/>.
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22 **/
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24
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25 #include "../PrecompiledHeaders.h"
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26 #include "CStringMatcher.h"
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27
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28 #include "../OrthancException.h"
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29
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30 #include <boost/algorithm/searching/boyer_moore.hpp>
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31
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32 namespace Orthanc
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33 {
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34 class CStringMatcher::Search : public boost::noncopyable
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35 {
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36 private:
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37 typedef boost::algorithm::boyer_moore<const char*> Algorithm;
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38
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39 Algorithm algorithm_;
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40
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41 public:
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42 // WARNING - The lifetime of "pattern_" must be larger than
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43 // "search_", as the latter internally keeps a pointer to "pattern" (*)
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44 explicit Search(const std::string& pattern) :
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45 algorithm_(pattern.c_str(), pattern.c_str() + pattern.size())
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46 {
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47 }
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48
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49 const char* Apply(const char* start,
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50 const char* end) const
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51 {
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52 #if BOOST_VERSION >= 106200
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53 return algorithm_(start, end).first;
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54 #else
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55 return algorithm_(start, end);
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56 #endif
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57 }
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58 };
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59
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61
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62 CStringMatcher::CStringMatcher(const std::string& pattern) :
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63 pattern_(pattern),
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64 valid_(false),
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65 matchBegin_(NULL),
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66 matchEnd_(NULL)
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67 {
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68 // WARNING - Don't use "pattern" (local variable, will be
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69 // destroyed once exiting the constructor) but "pattern_"
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70 // (variable member, will last as long as the algorithm),
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71 // otherwise lifetime is bad! (*)
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72 search_.reset(new Search(pattern_));
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73 }
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74
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75 const std::string& CStringMatcher::GetPattern() const
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76 {
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77 return pattern_;
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78 }
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79
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80 bool CStringMatcher::IsValid() const
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81 {
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82 return valid_;
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83 }
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84
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85
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86 bool CStringMatcher::Apply(const char* start,
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87 const char* end)
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88 {
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89 assert(search_.get() != NULL);
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90
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91 if (start > end)
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92 {
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93 throw OrthancException(ErrorCode_ParameterOutOfRange);
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94 }
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95
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96 matchBegin_ = search_->Apply(start, end);
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97
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98 if (matchBegin_ == end)
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99 {
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100 valid_ = false;
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101 }
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102 else
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103 {
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104 matchEnd_ = matchBegin_ + pattern_.size();
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105 assert(matchEnd_ <= end);
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106 valid_ = true;
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107 }
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108
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109 return valid_;
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110 }
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111
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112
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113 bool CStringMatcher::Apply(const std::string& corpus)
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114 {
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115 if (corpus.empty())
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116 {
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117 return false;
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118 }
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119 else
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120 {
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121 return Apply(corpus.c_str(), corpus.c_str() + corpus.size());
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122 }
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123 }
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124
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125
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126 const char* CStringMatcher::GetMatchBegin() const
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127 {
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128 if (valid_)
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129 {
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130 return matchBegin_;
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131 }
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132 else
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133 {
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134 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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135 }
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136 }
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137
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138
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139 const char* CStringMatcher::GetMatchEnd() const
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140 {
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141 if (valid_)
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142 {
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143 return matchEnd_;
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144 }
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145 else
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146 {
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147 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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148 }
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149 }
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150 }