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annotate Resources/WebAssembly/dcdict.h @ 3349:ef18ea68a362

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author Alain Mazy <alain@mazy.be>
date Thu, 18 Apr 2019 15:52:56 +0200
parents 97a74f0eac7a
children
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1 /*
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2 *
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3 * Copyright (C) 1994-2015, OFFIS e.V.
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4 * All rights reserved. See COPYRIGHT file for details.
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5 *
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6 * This software and supporting documentation were developed by
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7 *
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8 * OFFIS e.V.
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9 * R&D Division Health
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10 * Escherweg 2
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11 * D-26121 Oldenburg, Germany
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12 *
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13 *
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14 * Module: dcmdata
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15 *
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16 * Author: Andrew Hewett
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17 *
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18 * Purpose: Interface for loadable DICOM data dictionary
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19 *
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20 */
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21
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22
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23 #ifndef DCMDICT_H
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24 #define DCMDICT_H
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25
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26 #include "dcmtk/config/osconfig.h" /* make sure OS specific configuration is included first */
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27
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28 #include "dcmtk/ofstd/ofthread.h"
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29 #include "dcmtk/dcmdata/dchashdi.h"
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30
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31 /// maximum length of a line in the loadable DICOM dictionary
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32 #define DCM_MAXDICTLINESIZE 2048
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33
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34 /// maximum number of fields per entry in the loadable DICOM dictionary
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35 #define DCM_MAXDICTFIELDS 6
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36
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37 /// environment variable pointing to the data dictionary file
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38 #define DCM_DICT_ENVIRONMENT_VARIABLE "DCMDICTPATH"
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39
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40 #ifndef DCM_DICT_DEFAULT_PATH
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41 /*
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42 ** The default dictionary path is system dependent. It should
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43 ** be defined in a configuration file included from "osconfig.h"
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44 */
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45 #error "DCM_DICT_DEFAULT_PATH is not defined via osconfig.h"
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46 #endif /* !DCM_DICT_DEFAULT_PATH */
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47
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48 #ifndef ENVIRONMENT_PATH_SEPARATOR
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49 #define ENVIRONMENT_PATH_SEPARATOR '\n' /* at least define something unlikely */
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50 #endif
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51
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52
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53 /** this class implements a loadable DICOM Data Dictionary
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54 */
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55 class DCMTK_DCMDATA_EXPORT DcmDataDictionary
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56 {
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57 public:
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58
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59 /** constructor
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60 * @param loadBuiltin flag indicating if a built-in data dictionary
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61 * (if any) should be loaded.
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62 * @param loadExternal flag indicating if an external data dictionary
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63 * should be read from file.
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64 */
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65 DcmDataDictionary(OFBool loadBuiltin, OFBool loadExternal);
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66
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67 /// destructor
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68 ~DcmDataDictionary();
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69
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70 /** checks if a data dictionary is loaded (excluding the skeleton dictionary)
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71 * @return true if loaded, false if no dictionary is present
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72 */
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73 OFBool isDictionaryLoaded() const { return dictionaryLoaded; }
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74
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75 /// returns the number of normal (non-repeating) tag entries
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76 int numberOfNormalTagEntries() const { return hashDict.size(); }
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77
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78 /// returns the number of repeating tag entries
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79 int numberOfRepeatingTagEntries() const { return OFstatic_cast(int, repDict.size()); }
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80
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81 /** returns the number of dictionary entries that were loaded
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82 * either from file or from a built-in dictionary or both.
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83 */
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84 int numberOfEntries() const
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85 { return numberOfNormalTagEntries()
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86 + numberOfRepeatingTagEntries() - skeletonCount; }
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87
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88 /** returns the number of skeleton entries. The skeleton is a collection
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89 * of dictionary entries which are always present, even if neither internal
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90 * nor external dictionary have been loaded. It contains very basic
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91 * things like item delimitation and sequence delimitation.
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92 */
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93 int numberOfSkeletonEntries() const { return skeletonCount; }
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94
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95 /** reload data dictionaries. First, all dictionary entries are deleted.
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96 * @param loadBuiltin flag indicating if a built-in data dictionary
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97 * (if any) should be loaded.
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98 * @param loadExternal flag indicating if an external data dictionary
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99 * should be read from file.
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100 * @return true if reload was successful, false if an error occurred
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101 */
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102 OFBool reloadDictionaries(OFBool loadBuiltin, OFBool loadExternal);
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103
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104 /** load a particular dictionary from file.
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105 * @param fileName filename
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106 * @param errorIfAbsent causes the method to return false
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107 * if the file cannot be opened
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108 * @return false if the file contains a parse error or if the file could
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109 * not be opened and errorIfAbsent was set, true otherwise.
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110 */
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111 OFBool loadDictionary(const char* fileName, OFBool errorIfAbsent = OFTrue);
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112
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113 /** dictionary lookup for the given tag key and private creator name.
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114 * First the normal tag dictionary is searched. If not found
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115 * then the repeating tag dictionary is searched.
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116 * @param key tag key
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117 * @param privCreator private creator name, may be NULL
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118 */
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119 const DcmDictEntry* findEntry(const DcmTagKey& key, const char *privCreator) const;
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120
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121 /** dictionary lookup for the given attribute name.
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122 * First the normal tag dictionary is searched. If not found
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123 * then the repeating tag dictionary is searched.
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124 * Only considers standard attributes (i. e. without private creator)
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125 * @param name attribute name
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126 */
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127 const DcmDictEntry* findEntry(const char *name) const;
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128
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129 /// deletes all dictionary entries
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130 void clear();
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131
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132 /** adds an entry to the dictionary. Must be allocated via new.
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133 * The entry becomes the property of the dictionary and will be
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134 * deallocated (via delete) upon clear() or dictionary destruction.
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135 * If an equivalent entry already exists it will be replaced by
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136 * the new entry and the old entry deallocated (via delete).
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137 * @param entry pointer to new entry
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138 */
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139 void addEntry(DcmDictEntry* entry);
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140
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141 /* Iterators to access the normal and the repeating entries */
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142
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143 /// returns an iterator to the start of the normal (non-repeating) dictionary
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144 DcmHashDictIterator normalBegin() { return hashDict.begin(); }
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145
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146 /// returns an iterator to the end of the normal (non-repeating) dictionary
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147 DcmHashDictIterator normalEnd() { return hashDict.end(); }
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148
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149 /// returns an iterator to the start of the repeating tag dictionary
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150 DcmDictEntryListIterator repeatingBegin() { return repDict.begin(); }
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151
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152 /// returns an iterator to the end of the repeating tag dictionary
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153 DcmDictEntryListIterator repeatingEnd() { return repDict.end(); }
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154
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155 // Function by the Orthanc project to load a dictionary from a
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156 // memory buffer, which is necessary in sandboxed
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157 // environments. This is an adapted version of
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158 // DcmDataDictionary::loadDictionary().
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159 OFBool loadFromMemory(const std::string& content, OFBool errorIfAbsent = OFTrue);
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160
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161 private:
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162
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163 /** private undefined assignment operator
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164 */
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165 DcmDataDictionary &operator=(const DcmDataDictionary &);
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166
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167 /** private undefined copy constructor
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168 */
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169 DcmDataDictionary(const DcmDataDictionary &);
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170
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171 /** loads external dictionaries defined via environment variables
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172 * @return true if successful
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173 */
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174 OFBool loadExternalDictionaries();
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175
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176 /** loads a builtin (compiled) data dictionary.
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177 * Depending on which code is in use, this function may not
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178 * do anything.
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179 */
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180 void loadBuiltinDictionary();
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181
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182 /** loads the skeleton dictionary (the bare minimum needed to run)
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183 * @return true if successful
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184 */
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185 OFBool loadSkeletonDictionary();
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186
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187 /** looks up the given directory entry in the two dictionaries.
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188 * @return pointer to entry if found, NULL otherwise
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189 */
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190 const DcmDictEntry* findEntry(const DcmDictEntry& entry) const;
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191
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192 /** deletes the given entry from either dictionary
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193 */
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194 void deleteEntry(const DcmDictEntry& entry);
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195
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196
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197 /** dictionary of normal tags
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198 */
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199 DcmHashDict hashDict;
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200
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201 /** dictionary of repeating tags
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202 */
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203 DcmDictEntryList repDict;
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204
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205 /** the number of skeleton entries
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206 */
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207 int skeletonCount;
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208
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209 /** is a dictionary loaded (more than skeleton)
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210 */
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211 OFBool dictionaryLoaded;
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212
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213 };
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214
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215
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216 /** global singleton dicom dictionary that is used by DCMTK in order to lookup
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217 * attribute VR, tag names and so on. The dictionary is internally populated
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218 * on first use, if the user accesses it via rdlock() or wrlock(). The
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219 * dictionary allows safe read (shared) and write (exclusive) access from
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220 * multiple threads in parallel.
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221 */
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222 class DCMTK_DCMDATA_EXPORT GlobalDcmDataDictionary
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223 {
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224 public:
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225 /** constructor.
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226 */
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227 GlobalDcmDataDictionary();
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228
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229 /** destructor
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230 */
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231 ~GlobalDcmDataDictionary();
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232
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233 /** acquires a read lock and returns a const reference to
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234 * the dictionary.
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235 * @return const reference to dictionary
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236 */
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237 const DcmDataDictionary& rdlock();
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238
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239 /** acquires a write lock and returns a non-const reference
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240 * to the dictionary.
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241 * @return non-const reference to dictionary.
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242 */
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243 DcmDataDictionary& wrlock();
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244
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245 /** unlocks the read or write lock which must have been acquired previously.
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246 */
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247 void unlock();
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248
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249 /** checks if a data dictionary has been loaded. This method acquires and
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250 * releases a read lock. It must not be called with another lock on the
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251 * dictionary being held by the calling thread.
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252 * @return OFTrue if dictionary has been loaded, OFFalse otherwise.
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253 */
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254 OFBool isDictionaryLoaded();
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255
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256 /** erases the contents of the dictionary. This method acquires and
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257 * releases a write lock. It must not be called with another lock on the
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258 * dictionary being held by the calling thread. This method is intended
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259 * as a help for debugging memory leaks.
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260 */
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261 void clear();
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262
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263 private:
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264 /** private undefined assignment operator
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265 */
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266 GlobalDcmDataDictionary &operator=(const GlobalDcmDataDictionary &);
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267
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268 /** private undefined copy constructor
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269 */
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270 GlobalDcmDataDictionary(const GlobalDcmDataDictionary &);
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271
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272 /** create the data dictionary instance for this class. Used for first
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273 * intialization. The caller must not have dataDictLock locked.
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274 */
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275 void createDataDict();
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276
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277 /** the data dictionary managed by this class
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278 */
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279 DcmDataDictionary *dataDict;
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280
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281 #ifdef WITH_THREADS
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282 /** the read/write lock used to protect access from multiple threads
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283 */
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284 OFReadWriteLock dataDictLock;
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285 #endif
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286 };
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287
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288
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289 /** The Global DICOM Data Dictionary.
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290 * Will be created before main() starts and gets populated on its first use.
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291 * Tries to load a builtin data dictionary (if compiled in).
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292 * Tries to load data dictionaries from files specified by
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293 * the DCMDICTPATH environment variable. If this environment
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294 * variable does not exist then a default file is loaded (if
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295 * it exists).
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296 * It is possible that no data dictionary gets loaded. This
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297 * is likely to cause unexpected behaviour in the dcmdata
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298 * toolkit classes.
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299 */
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300 extern DCMTK_DCMDATA_EXPORT GlobalDcmDataDictionary dcmDataDict;
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301
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302 #endif