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annotate OrthancFramework/Sources/DicomFormat/DicomStreamReader.h @ 5104:ea3224848d05

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author Alain Mazy <am@osimis.io>
date Thu, 27 Oct 2022 12:57:29 +0200
parents 43e613a7756b
children 0ea402b4d901
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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) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #pragma once
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25
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26 #include "DicomTag.h"
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27 #include "StreamBlockReader.h"
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28
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29 namespace Orthanc
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30 {
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31 /**
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32 * This class parses a stream containing a DICOM instance, using a
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33 * state machine.
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34 *
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35 * It does *not* support the visit of sequences (it only works at
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36 * the first level of the hierarchy), and as a consequence, it
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37 * doesn't give access to the pixel data of compressed transfer
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38 * syntaxes.
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39 **/
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40 class ORTHANC_PUBLIC DicomStreamReader : public boost::noncopyable
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41 {
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42 public:
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43 class IVisitor : public boost::noncopyable
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44 {
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45 public:
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46 virtual ~IVisitor()
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47 {
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48 }
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49
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50 // The data from this function will always be Little Endian (as
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51 // specified by the DICOM standard)
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52 virtual void VisitMetaHeaderTag(const DicomTag& tag,
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53 const ValueRepresentation& vr,
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54 const std::string& value) = 0;
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55
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56 virtual void VisitTransferSyntax(DicomTransferSyntax transferSyntax) = 0;
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57
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58 // Return "false" to stop processing
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59 virtual bool VisitDatasetTag(const DicomTag& tag,
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60 const ValueRepresentation& vr,
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61 const std::string& value,
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62 bool isLittleEndian,
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63 uint64_t fileOffset) = 0;
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64 };
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65
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66 private:
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67 class PixelDataVisitor;
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68
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69 enum State
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70 {
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71 State_Preamble,
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72 State_MetaHeader,
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73 State_DatasetTag,
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74 State_SequenceExplicitLength,
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75 State_SequenceExplicitValue,
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76 State_DatasetExplicitLength,
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77 State_DatasetValue,
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78 State_Done
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79 };
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80
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81 StreamBlockReader reader_;
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82 State state_;
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83 DicomTransferSyntax transferSyntax_;
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84 DicomTag danglingTag_; // Current root-level tag
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85 ValueRepresentation danglingVR_;
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86 uint64_t danglingOffset_;
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87 unsigned int sequenceDepth_;
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88
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89 bool IsLittleEndian() const;
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90
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91 void HandlePreamble(IVisitor& visitor,
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92 const std::string& block);
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93
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94 void HandleMetaHeader(IVisitor& visitor,
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95 const std::string& block);
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96
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97 void HandleDatasetTag(const std::string& block,
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98 const DicomTag& untilTag);
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99
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100 void HandleDatasetExplicitLength(uint32_t length);
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101
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102 void HandleDatasetExplicitLength(IVisitor& visitor,
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103 const std::string& block);
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104
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105 void HandleSequenceExplicitLength(const std::string& block);
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106
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107 void HandleSequenceExplicitValue();
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108
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109 void HandleDatasetValue(IVisitor& visitor,
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110 const std::string& block);
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111
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112 public:
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113 explicit DicomStreamReader(std::istream& stream);
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114
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115 /**
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116 * Consume all the available bytes from the input stream, until
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117 * end-of-stream is reached or the current tag is ">= untilTag".
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118 * This method can be invoked several times, as more bytes are
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119 * available from the input stream. To check if the DICOM stream
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120 * is fully parsed until the goal tag, call "IsDone()".
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121 **/
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122 void Consume(IVisitor& visitor,
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123 const DicomTag& untilTag);
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124
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125 void Consume(IVisitor& visitor);
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126
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127 bool IsDone() const;
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128
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129 uint64_t GetProcessedBytes() const;
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130
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131 static bool LookupPixelDataOffset(uint64_t& offset,
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132 const std::string& dicom);
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133
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134 static bool LookupPixelDataOffset(uint64_t& offset,
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135 const void* buffer,
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136 size_t size);
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92a21efa5c96 reorganization of DicomStreamReader
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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137 };
92a21efa5c96 reorganization of DicomStreamReader
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
138 }