Mercurial > hg > orthanc
annotate OrthancFramework/Sources/DicomFormat/DicomStreamReader.h @ 4775:add0337b928a
refactoring parsing of numbers
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Mon, 30 Aug 2021 10:24:36 +0200 |
parents | 39192eb9b43d |
children | 7053502fbf97 |
rev | line source |
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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 #pragma once |
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24 |
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25 #include "DicomTag.h" |
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26 #include "StreamBlockReader.h" |
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27 |
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28 namespace Orthanc |
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29 { |
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30 /** |
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31 * This class parses a stream containing a DICOM instance, using a |
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32 * state machine. |
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33 * |
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34 * It does *not* support the visit of sequences (it only works at |
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35 * the first level of the hierarchy), and as a consequence, it |
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36 * doesn't give access to the pixel data of compressed transfer |
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37 * syntaxes. |
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38 **/ |
4224 | 39 class ORTHANC_PUBLIC DicomStreamReader : public boost::noncopyable |
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40 { |
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41 public: |
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42 class IVisitor : public boost::noncopyable |
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43 { |
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44 public: |
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45 virtual ~IVisitor() |
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46 { |
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47 } |
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48 |
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49 // The data from this function will always be Little Endian (as |
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50 // specified by the DICOM standard) |
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51 virtual void VisitMetaHeaderTag(const DicomTag& tag, |
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52 const ValueRepresentation& vr, |
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53 const std::string& value) = 0; |
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54 |
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55 virtual void VisitTransferSyntax(DicomTransferSyntax transferSyntax) = 0; |
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56 |
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57 // Return "false" to stop processing |
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58 virtual bool VisitDatasetTag(const DicomTag& tag, |
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59 const ValueRepresentation& vr, |
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60 const std::string& value, |
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61 bool isLittleEndian, |
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62 uint64_t fileOffset) = 0; |
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63 }; |
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64 |
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65 private: |
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66 class PixelDataVisitor; |
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67 |
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68 enum State |
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69 { |
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70 State_Preamble, |
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71 State_MetaHeader, |
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72 State_DatasetTag, |
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73 State_SequenceExplicitLength, |
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74 State_SequenceExplicitValue, |
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75 State_DatasetExplicitLength, |
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76 State_DatasetValue, |
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77 State_Done |
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78 }; |
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79 |
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80 StreamBlockReader reader_; |
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81 State state_; |
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82 DicomTransferSyntax transferSyntax_; |
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83 DicomTag danglingTag_; // Current root-level tag |
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84 ValueRepresentation danglingVR_; |
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85 uint64_t danglingOffset_; |
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86 unsigned int sequenceDepth_; |
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87 |
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88 bool IsLittleEndian() const; |
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89 |
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90 void HandlePreamble(IVisitor& visitor, |
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91 const std::string& block); |
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92 |
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93 void HandleMetaHeader(IVisitor& visitor, |
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94 const std::string& block); |
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95 |
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96 void HandleDatasetTag(const std::string& block, |
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97 const DicomTag& untilTag); |
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98 |
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99 void HandleDatasetExplicitLength(uint32_t length); |
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100 |
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101 void HandleDatasetExplicitLength(IVisitor& visitor, |
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102 const std::string& block); |
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103 |
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104 void HandleSequenceExplicitLength(const std::string& block); |
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105 |
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106 void HandleSequenceExplicitValue(); |
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107 |
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108 void HandleDatasetValue(IVisitor& visitor, |
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109 const std::string& block); |
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110 |
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111 public: |
4223 | 112 explicit DicomStreamReader(std::istream& stream); |
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113 |
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114 /** |
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115 * Consume all the available bytes from the input stream, until |
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116 * end-of-stream is reached or the current tag is ">= untilTag". |
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117 * This method can be invoked several times, as more bytes are |
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118 * available from the input stream. To check if the DICOM stream |
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119 * is fully parsed until the goal tag, call "IsDone()". |
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120 **/ |
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121 void Consume(IVisitor& visitor, |
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122 const DicomTag& untilTag); |
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123 |
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124 void Consume(IVisitor& visitor); |
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125 |
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126 bool IsDone() const; |
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127 |
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128 uint64_t GetProcessedBytes() const; |
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129 |
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DicomStreamReader::LookupPixelDataOffset()
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130 static bool LookupPixelDataOffset(uint64_t& offset, |
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131 const std::string& dicom); |
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132 |
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133 static bool LookupPixelDataOffset(uint64_t& offset, |
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134 const void* buffer, |
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135 size_t size); |
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136 }; |
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137 } |