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annotate OrthancFramework/Sources/DicomFormat/DicomStreamReader.h @ 4773:4757b36cc538

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rewording
author Alain Mazy <am@osimis.io>
date Mon, 30 Aug 2021 09:48:46 +0200
parents 39192eb9b43d
children 7053502fbf97
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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 **/
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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:
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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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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 };
92a21efa5c96 reorganization of DicomStreamReader
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
137 }