Mercurial > hg > orthanc

annotate OrthancFramework/Sources/DicomParsing/ParsedDicomDir.cpp @ 5649:4a2bfda999c6

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author Alain Mazy <am@orthanc.team>
date Mon, 03 Jun 2024 14:30:30 +0200
parents f7adfb22e20e
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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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23
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24
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25 #include "../PrecompiledHeaders.h"
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26 #include "ParsedDicomDir.h"
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27
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28 #include "../Compatibility.h"
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29 #include "../OrthancException.h"
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30 #include "ParsedDicomFile.h"
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31 #include "FromDcmtkBridge.h"
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32
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33 #include <dcmtk/dcmdata/dcdeftag.h>
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35
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36 namespace Orthanc
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37 {
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38 void ParsedDicomDir::Clear()
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39 {
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40 for (size_t i = 0; i < content_.size(); i++)
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41 {
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42 assert(content_[i] != NULL);
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43 delete content_[i];
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44 }
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45 }
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47
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48 bool ParsedDicomDir::LookupIndexOfOffset(size_t& target,
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49 unsigned int offset) const
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50 {
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51 if (offset == 0)
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52 {
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53 return false;
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54 }
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55
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56 OffsetToIndex::const_iterator found = offsetToIndex_.find(offset);
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57 if (found == offsetToIndex_.end())
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58 {
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59 // Error in the algorithm that computes the offsets
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60 throw OrthancException(ErrorCode_InternalError);
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61 }
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62 else
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63 {
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64 target = found->second;
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65 return true;
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66 }
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67 }
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68
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69
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70 ParsedDicomDir::ParsedDicomDir(const std::string& content)
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71 {
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72 ParsedDicomFile dicom(content);
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73
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74 DcmSequenceOfItems* sequence = NULL;
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75 if (dicom.GetDcmtkObject().getDataset() == NULL ||
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76 !dicom.GetDcmtkObject().getDataset()->findAndGetSequence(DCM_DirectoryRecordSequence, sequence).good() ||
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77 sequence == NULL)
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78 {
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79 throw OrthancException(ErrorCode_BadFileFormat, "Not a DICOMDIR");
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80 }
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81
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82 content_.resize(sequence->card());
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83 nextOffsets_.resize(content_.size());
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84 lowerOffsets_.resize(content_.size());
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85
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86 // Manually reconstruct the list of all the available offsets of
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87 // "DcmItem", as "fStartPosition" is a protected member in DCMTK
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88 // API
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89 std::set<uint32_t> availableOffsets;
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90 availableOffsets.insert(0);
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91
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92
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93 for (unsigned long i = 0; i < sequence->card(); i++)
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94 {
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95 DcmItem* item = sequence->getItem(i);
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96 if (item == NULL)
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97 {
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98 Clear();
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99 throw OrthancException(ErrorCode_InternalError);
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100 }
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101
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102 Uint32 next, lower;
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103 if (!item->findAndGetUint32(DCM_OffsetOfTheNextDirectoryRecord, next).good() ||
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104 !item->findAndGetUint32(DCM_OffsetOfReferencedLowerLevelDirectoryEntity, lower).good())
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105 {
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106 item->writeXML(std::cout);
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107 throw OrthancException(ErrorCode_BadFileFormat,
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108 "Missing offsets in DICOMDIR");
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109 }
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110
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111 nextOffsets_[i] = next;
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112 lowerOffsets_[i] = lower;
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113
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114 std::unique_ptr<DicomMap> entry(new DicomMap);
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115
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116 std::set<DicomTag> ignoreTagLength;
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117 FromDcmtkBridge::ExtractDicomSummary(*entry, *item, 0 /* don't truncate tags */, ignoreTagLength);
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118
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119 if (next != 0)
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120 {
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121 availableOffsets.insert(next);
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122 }
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123
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124 if (lower != 0)
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125 {
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126 availableOffsets.insert(lower);
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127 }
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128
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129 content_[i] = entry.release();
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130 }
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131
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132 if (content_.size() != availableOffsets.size())
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133 {
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134 throw OrthancException(ErrorCode_BadFileFormat,
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135 "Inconsistent offsets in DICOMDIR");
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136 }
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137
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138 unsigned int index = 0;
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139 for (std::set<uint32_t>::const_iterator it = availableOffsets.begin();
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140 it != availableOffsets.end(); ++it)
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141 {
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142 offsetToIndex_[*it] = index;
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143 index ++;
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144 }
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145 }
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146
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147 ParsedDicomDir::~ParsedDicomDir()
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148 {
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149 Clear();
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150 }
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151
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152 size_t ParsedDicomDir::GetSize() const
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153 {
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154 return content_.size();
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155 }
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156
3554
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157
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158 const DicomMap& ParsedDicomDir::GetItem(size_t i) const
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159 {
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160 if (i >= content_.size())
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161 {
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162 throw OrthancException(ErrorCode_ParameterOutOfRange);
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163 }
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164 else
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165 {
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166 assert(content_[i] != NULL);
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167 return *content_[i];
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168 }
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169 }
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170
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171
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172 bool ParsedDicomDir::LookupNext(size_t& target,
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173 size_t index) const
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174 {
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175 if (index >= nextOffsets_.size())
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176 {
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177 throw OrthancException(ErrorCode_ParameterOutOfRange);
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178 }
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179 else
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180 {
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181 return LookupIndexOfOffset(target, nextOffsets_[index]);
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182 }
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183 }
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184
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185
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186 bool ParsedDicomDir::LookupLower(size_t& target,
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187 size_t index) const
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188 {
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189 if (index >= lowerOffsets_.size())
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190 {
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191 throw OrthancException(ErrorCode_ParameterOutOfRange);
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192 }
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193 else
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194 {
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195 return LookupIndexOfOffset(target, lowerOffsets_[index]);
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196 }
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197 }
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198 }