Mercurial > hg > orthanc
annotate OrthancFramework/Sources/DicomFormat/DicomStreamReader.h @ 5853:4d932683049d get-scu tip
very first implementation of C-Get SCU
author | Alain Mazy <am@orthanc.team> |
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date | Tue, 29 Oct 2024 17:25:49 +0100 |
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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 **/ |
4224 | 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: |
4223 | 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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136 static bool LookupPixelDataOffset(uint64_t& offset /* out */, |
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137 ValueRepresentation& vr /* out */, |
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138 const void* buffer, |
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139 size_t size); |
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140 }; |
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141 } |