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annotate OrthancFramework/Sources/DicomParsing/ParsedDicomDir.cpp @ 4706:dbee8bd8ee1f

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 22 Jun 2021 09:13:03 +0200
parents d9473bd5ed43
children 7053502fbf97
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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 "ParsedDicomDir.h"
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25
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26 #include "../Compatibility.h"
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27 #include "../OrthancException.h"
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28 #include "ParsedDicomFile.h"
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29 #include "FromDcmtkBridge.h"
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30
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31 #include <dcmtk/dcmdata/dcdeftag.h>
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32
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33
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34 namespace Orthanc
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35 {
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36 void ParsedDicomDir::Clear()
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37 {
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38 for (size_t i = 0; i < content_.size(); i++)
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39 {
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40 assert(content_[i] != NULL);
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41 delete content_[i];
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42 }
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43 }
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46 bool ParsedDicomDir::LookupIndexOfOffset(size_t& target,
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47 unsigned int offset) const
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48 {
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49 if (offset == 0)
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50 {
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51 return false;
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52 }
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53
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54 OffsetToIndex::const_iterator found = offsetToIndex_.find(offset);
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55 if (found == offsetToIndex_.end())
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56 {
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57 // Error in the algorithm that computes the offsets
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58 throw OrthancException(ErrorCode_InternalError);
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59 }
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60 else
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61 {
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62 target = found->second;
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63 return true;
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64 }
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65 }
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66
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67
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68 ParsedDicomDir::ParsedDicomDir(const std::string& content)
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69 {
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70 ParsedDicomFile dicom(content);
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71
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72 DcmSequenceOfItems* sequence = NULL;
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73 if (dicom.GetDcmtkObject().getDataset() == NULL ||
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74 !dicom.GetDcmtkObject().getDataset()->findAndGetSequence(DCM_DirectoryRecordSequence, sequence).good() ||
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75 sequence == NULL)
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76 {
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77 throw OrthancException(ErrorCode_BadFileFormat, "Not a DICOMDIR");
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78 }
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79
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80 content_.resize(sequence->card());
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81 nextOffsets_.resize(content_.size());
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82 lowerOffsets_.resize(content_.size());
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83
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84 // Manually reconstruct the list of all the available offsets of
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85 // "DcmItem", as "fStartPosition" is a protected member in DCMTK
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86 // API
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87 std::set<uint32_t> availableOffsets;
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88 availableOffsets.insert(0);
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89
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90
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91 for (unsigned long i = 0; i < sequence->card(); i++)
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92 {
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93 DcmItem* item = sequence->getItem(i);
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94 if (item == NULL)
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95 {
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96 Clear();
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97 throw OrthancException(ErrorCode_InternalError);
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98 }
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99
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100 Uint32 next, lower;
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101 if (!item->findAndGetUint32(DCM_OffsetOfTheNextDirectoryRecord, next).good() ||
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102 !item->findAndGetUint32(DCM_OffsetOfReferencedLowerLevelDirectoryEntity, lower).good())
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103 {
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104 item->writeXML(std::cout);
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105 throw OrthancException(ErrorCode_BadFileFormat,
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106 "Missing offsets in DICOMDIR");
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107 }
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108
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109 nextOffsets_[i] = next;
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110 lowerOffsets_[i] = lower;
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111
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112 std::unique_ptr<DicomMap> entry(new DicomMap);
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113
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114 std::set<DicomTag> ignoreTagLength;
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115 FromDcmtkBridge::ExtractDicomSummary(*entry, *item, 0 /* don't truncate tags */, ignoreTagLength);
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116
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117 if (next != 0)
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118 {
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119 availableOffsets.insert(next);
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120 }
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121
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122 if (lower != 0)
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123 {
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124 availableOffsets.insert(lower);
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125 }
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126
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127 content_[i] = entry.release();
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128 }
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129
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130 if (content_.size() != availableOffsets.size())
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131 {
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132 throw OrthancException(ErrorCode_BadFileFormat,
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133 "Inconsistent offsets in DICOMDIR");
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134 }
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135
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136 unsigned int index = 0;
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137 for (std::set<uint32_t>::const_iterator it = availableOffsets.begin();
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138 it != availableOffsets.end(); ++it)
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139 {
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140 offsetToIndex_[*it] = index;
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141 index ++;
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142 }
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143 }
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144
4297
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145 ParsedDicomDir::~ParsedDicomDir()
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146 {
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147 Clear();
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148 }
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149
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150 size_t ParsedDicomDir::GetSize() const
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151 {
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152 return content_.size();
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153 }
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154
3554
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155
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156 const DicomMap& ParsedDicomDir::GetItem(size_t i) const
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157 {
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158 if (i >= content_.size())
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159 {
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160 throw OrthancException(ErrorCode_ParameterOutOfRange);
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161 }
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162 else
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163 {
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164 assert(content_[i] != NULL);
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165 return *content_[i];
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166 }
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167 }
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168
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169
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170 bool ParsedDicomDir::LookupNext(size_t& target,
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171 size_t index) const
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172 {
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173 if (index >= nextOffsets_.size())
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174 {
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175 throw OrthancException(ErrorCode_ParameterOutOfRange);
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176 }
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177 else
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178 {
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179 return LookupIndexOfOffset(target, nextOffsets_[index]);
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180 }
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181 }
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182
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183
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184 bool ParsedDicomDir::LookupLower(size_t& target,
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185 size_t index) const
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186 {
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187 if (index >= lowerOffsets_.size())
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188 {
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189 throw OrthancException(ErrorCode_ParameterOutOfRange);
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190 }
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191 else
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192 {
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193 return LookupIndexOfOffset(target, lowerOffsets_[index]);
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194 }
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195 }
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196 }