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annotate OrthancFramework/Sources/DicomFormat/DicomStreamReader.h @ 5657:dedbf019a707

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Improved parsing of multiple numerical values in DICOM tags
author Alain Mazy <am@orthanc.team>
date Thu, 06 Jun 2024 17:55:13 +0200
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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 #pragma once
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26
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27 #include "DicomTag.h"
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28 #include "StreamBlockReader.h"
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29
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30 namespace Orthanc
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31 {
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32 /**
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33 * This class parses a stream containing a DICOM instance, using a
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34 * state machine.
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35 *
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36 * It does *not* support the visit of sequences (it only works at
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37 * the first level of the hierarchy), and as a consequence, it
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38 * doesn't give access to the pixel data of compressed transfer
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39 * syntaxes.
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40 **/
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41 class ORTHANC_PUBLIC DicomStreamReader : public boost::noncopyable
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42 {
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43 public:
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44 class IVisitor : public boost::noncopyable
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45 {
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46 public:
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47 virtual ~IVisitor()
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48 {
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49 }
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50
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51 // The data from this function will always be Little Endian (as
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52 // specified by the DICOM standard)
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53 virtual void VisitMetaHeaderTag(const DicomTag& tag,
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54 const ValueRepresentation& vr,
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55 const std::string& value) = 0;
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56
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57 virtual void VisitTransferSyntax(DicomTransferSyntax transferSyntax) = 0;
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58
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59 // Return "false" to stop processing
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60 virtual bool VisitDatasetTag(const DicomTag& tag,
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61 const ValueRepresentation& vr,
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62 const std::string& value,
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63 bool isLittleEndian,
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64 uint64_t fileOffset) = 0;
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65 };
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66
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67 private:
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68 class PixelDataVisitor;
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69
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70 enum State
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71 {
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72 State_Preamble,
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73 State_MetaHeader,
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74 State_DatasetTag,
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75 State_SequenceExplicitLength,
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76 State_SequenceExplicitValue,
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77 State_DatasetExplicitLength,
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78 State_DatasetValue,
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79 State_Done
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80 };
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81
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82 StreamBlockReader reader_;
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83 State state_;
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84 DicomTransferSyntax transferSyntax_;
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85 DicomTag danglingTag_; // Current root-level tag
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86 ValueRepresentation danglingVR_;
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87 uint64_t danglingOffset_;
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88 unsigned int sequenceDepth_;
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89
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90 bool IsLittleEndian() const;
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91
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92 void HandlePreamble(IVisitor& visitor,
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93 const std::string& block);
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94
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95 void HandleMetaHeader(IVisitor& visitor,
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96 const std::string& block);
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97
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98 void HandleDatasetTag(const std::string& block,
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99 const DicomTag& untilTag);
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100
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101 void HandleDatasetExplicitLength(uint32_t length);
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102
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103 void HandleDatasetExplicitLength(IVisitor& visitor,
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104 const std::string& block);
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105
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106 void HandleSequenceExplicitLength(const std::string& block);
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107
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108 void HandleSequenceExplicitValue();
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109
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110 void HandleDatasetValue(IVisitor& visitor,
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111 const std::string& block);
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112
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113 public:
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114 explicit DicomStreamReader(std::istream& stream);
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115
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116 /**
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117 * Consume all the available bytes from the input stream, until
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118 * end-of-stream is reached or the current tag is ">= untilTag".
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119 * This method can be invoked several times, as more bytes are
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120 * available from the input stream. To check if the DICOM stream
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121 * is fully parsed until the goal tag, call "IsDone()".
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122 **/
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123 void Consume(IVisitor& visitor,
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124 const DicomTag& untilTag);
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125
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126 void Consume(IVisitor& visitor);
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127
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128 bool IsDone() const;
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129
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130 uint64_t GetProcessedBytes() const;
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131
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132 static bool LookupPixelDataOffset(uint64_t& offset /* out */,
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133 ValueRepresentation& vr /* out */,
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134 const std::string& dicom);
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135
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parents: 5185
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136 static bool LookupPixelDataOffset(uint64_t& offset /* out */,
03501a258d9e added instance metadata "PixelDataVR"
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 5185
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137 ValueRepresentation& vr /* out */,
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39192eb9b43d New metadata automatically computed at the instance level: "PixelDataOffset"
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 4493
diff changeset
138 const void* buffer,
39192eb9b43d New metadata automatically computed at the instance level: "PixelDataOffset"
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 4493
diff changeset
139 size_t size);
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92a21efa5c96 reorganization of DicomStreamReader
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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140 };
92a21efa5c96 reorganization of DicomStreamReader
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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141 }