Mercurial > hg > orthanc
annotate OrthancFramework/Sources/DicomFormat/DicomStreamReader.cpp @ 4831:7053502fbf97
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Thu, 25 Nov 2021 19:01:11 +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) 2017-2021 Osimis S.A., Belgium |
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6 * Copyright (C) 2021-2021 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 #include "../PrecompiledHeaders.h" |
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25 #include "DicomStreamReader.h" |
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26 |
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27 #include "../OrthancException.h" |
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28 |
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30 #include <sstream> |
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31 #include <boost/iostreams/device/array.hpp> |
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32 #include <boost/iostreams/stream.hpp> |
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33 |
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35 #include <iostream> |
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36 |
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37 namespace Orthanc |
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38 { |
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39 static bool IsNormalizationNeeded(const std::string& source, |
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40 ValueRepresentation vr) |
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41 { |
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42 return (!source.empty() && |
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43 (source[source.size() - 1] == ' ' || |
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44 source[source.size() - 1] == '\0') && |
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45 // Normalization only applies to string-based VR |
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46 (vr == ValueRepresentation_ApplicationEntity || |
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47 vr == ValueRepresentation_AgeString || |
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48 vr == ValueRepresentation_CodeString || |
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49 vr == ValueRepresentation_DecimalString || |
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50 vr == ValueRepresentation_IntegerString || |
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51 vr == ValueRepresentation_LongString || |
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52 vr == ValueRepresentation_LongText || |
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53 vr == ValueRepresentation_PersonName || |
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54 vr == ValueRepresentation_ShortString || |
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55 vr == ValueRepresentation_ShortText || |
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56 vr == ValueRepresentation_UniqueIdentifier || |
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57 vr == ValueRepresentation_UnlimitedText)); |
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58 } |
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59 |
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60 |
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61 static void NormalizeValue(std::string& inplace, |
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62 ValueRepresentation vr) |
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63 { |
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64 if (IsNormalizationNeeded(inplace, vr)) |
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65 { |
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66 assert(!inplace.empty()); |
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67 inplace.resize(inplace.size() - 1); |
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68 } |
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69 } |
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70 |
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71 |
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72 static uint16_t ReadUnsignedInteger16(const char* dicom, |
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73 bool littleEndian) |
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74 { |
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75 const uint8_t* p = reinterpret_cast<const uint8_t*>(dicom); |
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76 |
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77 if (littleEndian) |
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78 { |
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79 return (static_cast<uint16_t>(p[0]) | |
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80 (static_cast<uint16_t>(p[1]) << 8)); |
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81 } |
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82 else |
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83 { |
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84 return (static_cast<uint16_t>(p[1]) | |
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85 (static_cast<uint16_t>(p[0]) << 8)); |
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86 } |
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87 } |
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88 |
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89 |
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90 static uint32_t ReadUnsignedInteger32(const char* dicom, |
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91 bool littleEndian) |
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92 { |
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93 const uint8_t* p = reinterpret_cast<const uint8_t*>(dicom); |
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94 |
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95 if (littleEndian) |
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96 { |
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97 return (static_cast<uint32_t>(p[0]) | |
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98 (static_cast<uint32_t>(p[1]) << 8) | |
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99 (static_cast<uint32_t>(p[2]) << 16) | |
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100 (static_cast<uint32_t>(p[3]) << 24)); |
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101 } |
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102 else |
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103 { |
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104 return (static_cast<uint32_t>(p[3]) | |
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105 (static_cast<uint32_t>(p[2]) << 8) | |
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106 (static_cast<uint32_t>(p[1]) << 16) | |
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107 (static_cast<uint32_t>(p[0]) << 24)); |
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108 } |
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109 } |
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110 |
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111 |
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112 static DicomTag ReadTag(const char* dicom, |
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113 bool littleEndian) |
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114 { |
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115 return DicomTag(ReadUnsignedInteger16(dicom, littleEndian), |
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116 ReadUnsignedInteger16(dicom + 2, littleEndian)); |
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117 } |
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118 |
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119 |
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120 static bool IsShortExplicitTag(ValueRepresentation vr) |
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121 { |
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122 /** |
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123 * Are we in the case of Table 7.1-2? "Data Element with |
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124 * Explicit VR of AE, AS, AT, CS, DA, DS, DT, FL, FD, IS, LO, |
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125 * LT, PN, SH, SL, SS, ST, TM, UI, UL and US" |
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126 * http://dicom.nema.org/medical/dicom/current/output/chtml/part05/chapter_7.html#sect_7.1.2 |
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127 **/ |
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128 return (vr == ValueRepresentation_ApplicationEntity /* AE */ || |
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129 vr == ValueRepresentation_AgeString /* AS */ || |
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130 vr == ValueRepresentation_AttributeTag /* AT */ || |
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131 vr == ValueRepresentation_CodeString /* CS */ || |
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132 vr == ValueRepresentation_Date /* DA */ || |
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133 vr == ValueRepresentation_DecimalString /* DS */ || |
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134 vr == ValueRepresentation_DateTime /* DT */ || |
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135 vr == ValueRepresentation_FloatingPointSingle /* FL */ || |
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136 vr == ValueRepresentation_FloatingPointDouble /* FD */ || |
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137 vr == ValueRepresentation_IntegerString /* IS */ || |
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138 vr == ValueRepresentation_LongString /* LO */ || |
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139 vr == ValueRepresentation_LongText /* LT */ || |
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140 vr == ValueRepresentation_PersonName /* PN */ || |
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141 vr == ValueRepresentation_ShortString /* SH */ || |
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142 vr == ValueRepresentation_SignedLong /* SL */ || |
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143 vr == ValueRepresentation_SignedShort /* SS */ || |
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144 vr == ValueRepresentation_ShortText /* ST */ || |
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145 vr == ValueRepresentation_Time /* TM */ || |
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146 vr == ValueRepresentation_UniqueIdentifier /* UI */ || |
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147 vr == ValueRepresentation_UnsignedLong /* UL */ || |
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148 vr == ValueRepresentation_UnsignedShort /* US */); |
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149 } |
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150 |
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151 |
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152 bool DicomStreamReader::IsLittleEndian() const |
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153 { |
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154 return (transferSyntax_ != DicomTransferSyntax_BigEndianExplicit); |
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155 } |
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156 |
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157 |
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158 void DicomStreamReader::HandlePreamble(IVisitor& visitor, |
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159 const std::string& block) |
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160 { |
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161 assert(block.size() == 144u); |
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162 assert(reader_.GetProcessedBytes() == 144u); |
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163 |
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164 /** |
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165 * The "DICOM file meta information" is always encoded using |
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166 * "Explicit VR Little Endian Transfer Syntax" |
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167 * http://dicom.nema.org/medical/dicom/current/output/chtml/part10/chapter_7.html |
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168 **/ |
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169 if (block[128] != 'D' || |
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170 block[129] != 'I' || |
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171 block[130] != 'C' || |
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172 block[131] != 'M' || |
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173 ReadTag(block.c_str() + 132, true) != DicomTag(0x0002, 0x0000) || |
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174 block[136] != 'U' || |
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175 block[137] != 'L' || |
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176 ReadUnsignedInteger16(block.c_str() + 138, true) != 4) |
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177 { |
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178 throw OrthancException(ErrorCode_BadFileFormat); |
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179 } |
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180 |
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181 uint32_t length = ReadUnsignedInteger32(block.c_str() + 140, true); |
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182 |
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183 reader_.Schedule(length); |
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184 state_ = State_MetaHeader; |
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185 } |
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186 |
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187 |
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188 void DicomStreamReader::HandleMetaHeader(IVisitor& visitor, |
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189 const std::string& block) |
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190 { |
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191 size_t pos = 0; |
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192 const char* p = block.c_str(); |
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193 |
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194 bool hasTransferSyntax = false; |
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195 |
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196 while (pos + 8 <= block.size()) |
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197 { |
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198 DicomTag tag = ReadTag(p + pos, true); |
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199 |
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200 ValueRepresentation vr = StringToValueRepresentation(std::string(p + pos + 4, 2), true); |
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201 |
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202 if (IsShortExplicitTag(vr)) |
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203 { |
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204 uint16_t length = ReadUnsignedInteger16(p + pos + 6, true); |
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205 |
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206 std::string value; |
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207 value.assign(p + pos + 8, length); |
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208 NormalizeValue(value, vr); |
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209 |
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210 if (tag.GetGroup() == 0x0002) |
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211 { |
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212 visitor.VisitMetaHeaderTag(tag, vr, value); |
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213 } |
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214 |
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215 if (tag == DICOM_TAG_TRANSFER_SYNTAX_UID) |
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216 { |
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217 if (LookupTransferSyntax(transferSyntax_, value)) |
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218 { |
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219 hasTransferSyntax = true; |
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220 } |
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221 else |
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222 { |
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223 throw OrthancException(ErrorCode_NotImplemented, "Unsupported transfer syntax: " + value); |
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224 } |
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225 } |
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226 |
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227 pos += length + 8; |
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228 } |
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229 else if (pos + 12 <= block.size()) |
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230 { |
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231 uint16_t reserved = ReadUnsignedInteger16(p + pos + 6, true); |
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232 if (reserved != 0) |
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233 { |
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234 break; |
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235 } |
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236 |
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237 uint32_t length = ReadUnsignedInteger32(p + pos + 8, true); |
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238 |
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239 if (tag.GetGroup() == 0x0002) |
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240 { |
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241 std::string value; |
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242 value.assign(p + pos + 12, length); |
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243 NormalizeValue(value, vr); |
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244 visitor.VisitMetaHeaderTag(tag, vr, value); |
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245 } |
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246 |
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247 pos += length + 12; |
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248 } |
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249 } |
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250 |
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251 if (pos != block.size()) |
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252 { |
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253 throw OrthancException(ErrorCode_BadFileFormat); |
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254 } |
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255 |
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256 if (!hasTransferSyntax) |
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257 { |
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258 throw OrthancException(ErrorCode_BadFileFormat, "DICOM file meta-header without transfer syntax UID"); |
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259 } |
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260 |
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261 visitor.VisitTransferSyntax(transferSyntax_); |
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262 |
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263 reader_.Schedule(8); |
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264 state_ = State_DatasetTag; |
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265 } |
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266 |
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267 |
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268 void DicomStreamReader::HandleDatasetTag(const std::string& block, |
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269 const DicomTag& untilTag) |
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270 { |
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271 static const DicomTag DICOM_TAG_SEQUENCE_ITEM(0xfffe, 0xe000); |
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272 static const DicomTag DICOM_TAG_SEQUENCE_DELIMITATION_ITEM(0xfffe, 0xe00d); |
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273 static const DicomTag DICOM_TAG_SEQUENCE_DELIMITATION_SEQUENCE(0xfffe, 0xe0dd); |
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274 |
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275 assert(block.size() == 8u); |
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276 |
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277 const bool littleEndian = IsLittleEndian(); |
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278 DicomTag tag = ReadTag(block.c_str(), littleEndian); |
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279 |
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280 if (sequenceDepth_ == 0 && |
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281 tag >= untilTag) |
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282 { |
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283 state_ = State_Done; |
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284 return; |
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285 } |
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286 |
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287 if (tag == DICOM_TAG_SEQUENCE_ITEM || |
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288 tag == DICOM_TAG_SEQUENCE_DELIMITATION_ITEM || |
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289 tag == DICOM_TAG_SEQUENCE_DELIMITATION_SEQUENCE) |
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290 { |
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291 // The special sequence items are encoded like "Implicit VR" |
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292 uint32_t length = ReadUnsignedInteger32(block.c_str() + 4, littleEndian); |
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293 |
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294 if (tag == DICOM_TAG_SEQUENCE_ITEM) |
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295 { |
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296 if (length == 0xffffffffu) |
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297 { |
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298 // Undefined length: Need to loop over the tags of the nested dataset |
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299 reader_.Schedule(8); |
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300 state_ = State_DatasetTag; |
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301 } |
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302 else |
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303 { |
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304 // Explicit length: Can skip the full sequence at once |
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305 reader_.Schedule(length); |
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306 state_ = State_DatasetValue; |
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307 } |
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308 } |
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309 else if (tag == DICOM_TAG_SEQUENCE_DELIMITATION_ITEM || |
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310 tag == DICOM_TAG_SEQUENCE_DELIMITATION_SEQUENCE) |
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311 { |
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312 if (length != 0 || |
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313 sequenceDepth_ == 0) |
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314 { |
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315 throw OrthancException(ErrorCode_BadFileFormat); |
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316 } |
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317 |
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318 if (tag == DICOM_TAG_SEQUENCE_DELIMITATION_SEQUENCE) |
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319 { |
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320 sequenceDepth_ --; |
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321 } |
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322 |
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323 reader_.Schedule(8); |
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324 state_ = State_DatasetTag; |
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325 } |
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326 else |
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327 { |
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328 throw OrthancException(ErrorCode_InternalError); |
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329 } |
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330 } |
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331 else |
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332 { |
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333 assert(reader_.GetProcessedBytes() >= block.size()); |
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334 const uint64_t tagOffset = reader_.GetProcessedBytes() - block.size(); |
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335 |
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336 ValueRepresentation vr = ValueRepresentation_Unknown; |
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337 |
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338 if (transferSyntax_ == DicomTransferSyntax_LittleEndianImplicit) |
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339 { |
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340 if (sequenceDepth_ == 0) |
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341 { |
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342 danglingTag_ = tag; |
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343 danglingVR_ = vr; |
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344 danglingOffset_ = tagOffset; |
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345 } |
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346 |
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347 uint32_t length = ReadUnsignedInteger32(block.c_str() + 4, true /* little endian */); |
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348 HandleDatasetExplicitLength(length); |
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349 } |
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350 else |
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351 { |
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352 // This in an explicit transfer syntax |
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353 |
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354 vr = StringToValueRepresentation( |
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355 std::string(block.c_str() + 4, 2), false /* ignore unknown VR */); |
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356 |
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357 if (vr == ValueRepresentation_Sequence) |
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358 { |
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359 sequenceDepth_ ++; |
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360 reader_.Schedule(4); |
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361 state_ = State_SequenceExplicitLength; |
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362 } |
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363 else if (IsShortExplicitTag(vr)) |
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364 { |
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365 uint16_t length = ReadUnsignedInteger16(block.c_str() + 6, littleEndian); |
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366 |
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367 reader_.Schedule(length); |
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368 state_ = State_DatasetValue; |
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369 } |
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370 else |
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371 { |
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372 uint16_t reserved = ReadUnsignedInteger16(block.c_str() + 6, littleEndian); |
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373 if (reserved != 0) |
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374 { |
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375 throw OrthancException(ErrorCode_BadFileFormat); |
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376 } |
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377 |
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378 reader_.Schedule(4); |
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379 state_ = State_DatasetExplicitLength; |
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380 } |
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381 |
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382 if (sequenceDepth_ == 0) |
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383 { |
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384 danglingTag_ = tag; |
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385 danglingVR_ = vr; |
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386 danglingOffset_ = tagOffset; |
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387 } |
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388 } |
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389 } |
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390 } |
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391 |
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392 |
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393 void DicomStreamReader::HandleDatasetExplicitLength(uint32_t length) |
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394 { |
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395 if (length == 0xffffffffu) |
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396 { |
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397 /** |
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398 * This is the case of pixel data with compressed transfer |
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399 * syntaxes. Schedule the reading of the first tag of the |
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400 * nested dataset. |
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401 * http://dicom.nema.org/medical/dicom/current/output/chtml/part05/sect_7.5.html |
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402 **/ |
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403 state_ = State_DatasetTag; |
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404 reader_.Schedule(8); |
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405 sequenceDepth_ ++; |
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406 } |
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407 else |
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408 { |
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409 reader_.Schedule(length); |
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410 state_ = State_DatasetValue; |
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411 } |
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412 } |
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413 |
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414 |
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415 void DicomStreamReader::HandleDatasetExplicitLength(IVisitor& visitor, |
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416 const std::string& block) |
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417 { |
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418 assert(block.size() == 4); |
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419 |
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420 uint32_t length = ReadUnsignedInteger32(block.c_str(), IsLittleEndian()); |
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421 HandleDatasetExplicitLength(length); |
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422 |
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423 std::string empty; |
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424 if (!visitor.VisitDatasetTag(danglingTag_, danglingVR_, empty, IsLittleEndian(), danglingOffset_)) |
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425 { |
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426 state_ = State_Done; |
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427 } |
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428 } |
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429 |
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430 |
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431 void DicomStreamReader::HandleSequenceExplicitLength(const std::string& block) |
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432 { |
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433 assert(block.size() == 4); |
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434 |
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435 uint32_t length = ReadUnsignedInteger32(block.c_str(), IsLittleEndian()); |
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436 if (length == 0xffffffffu) |
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437 { |
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438 state_ = State_DatasetTag; |
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439 reader_.Schedule(8); |
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440 } |
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441 else |
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|
442 { |
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443 reader_.Schedule(length); |
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444 state_ = State_SequenceExplicitValue; |
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445 } |
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|
446 } |
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|
447 |
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448 |
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449 void DicomStreamReader::HandleSequenceExplicitValue() |
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450 { |
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451 if (sequenceDepth_ == 0) |
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452 { |
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453 throw OrthancException(ErrorCode_InternalError); |
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454 } |
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455 |
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456 sequenceDepth_ --; |
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457 |
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458 state_ = State_DatasetTag; |
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459 reader_.Schedule(8); |
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460 } |
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461 |
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462 |
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463 void DicomStreamReader::HandleDatasetValue(IVisitor& visitor, |
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464 const std::string& block) |
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465 { |
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466 if (sequenceDepth_ == 0) |
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467 { |
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468 bool c; |
4221
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|
469 |
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470 if (IsNormalizationNeeded(block, danglingVR_)) |
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471 { |
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472 std::string s(block.begin(), block.end() - 1); |
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473 c = visitor.VisitDatasetTag(danglingTag_, danglingVR_, s, IsLittleEndian(), danglingOffset_); |
4220
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474 } |
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|
475 else |
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|
476 { |
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477 c = visitor.VisitDatasetTag(danglingTag_, danglingVR_, block, IsLittleEndian(), danglingOffset_); |
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478 } |
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479 |
4220
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|
480 if (!c) |
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481 { |
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482 state_ = State_Done; |
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483 return; |
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484 } |
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485 } |
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486 |
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487 reader_.Schedule(8); |
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488 state_ = State_DatasetTag; |
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489 } |
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490 |
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491 |
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492 DicomStreamReader::DicomStreamReader(std::istream& stream) : |
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493 reader_(stream), |
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494 state_(State_Preamble), |
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495 transferSyntax_(DicomTransferSyntax_LittleEndianImplicit), // Dummy |
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496 danglingTag_(0x0000, 0x0000), // Dummy |
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497 danglingVR_(ValueRepresentation_Unknown), // Dummy |
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498 danglingOffset_(0), // Dummy |
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499 sequenceDepth_(0) |
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500 { |
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501 reader_.Schedule(128 /* empty header */ + |
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502 4 /* "DICM" magic value */ + |
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503 4 /* (0x0002, 0x0000) tag */ + |
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504 2 /* value representation of (0x0002, 0x0000) == "UL" */ + |
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505 2 /* length of "UL" value == 4 */ + |
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506 4 /* actual length of the meta-header */); |
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507 } |
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508 |
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509 |
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510 void DicomStreamReader::Consume(IVisitor& visitor, |
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511 const DicomTag& untilTag) |
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512 { |
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513 while (state_ != State_Done) |
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514 { |
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515 std::string block; |
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516 if (reader_.Read(block)) |
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517 { |
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518 switch (state_) |
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519 { |
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520 case State_Preamble: |
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521 HandlePreamble(visitor, block); |
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522 break; |
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523 |
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524 case State_MetaHeader: |
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525 HandleMetaHeader(visitor, block); |
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526 break; |
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527 |
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528 case State_DatasetTag: |
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529 HandleDatasetTag(block, untilTag); |
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530 break; |
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|
531 |
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|
532 case State_DatasetExplicitLength: |
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533 HandleDatasetExplicitLength(visitor, block); |
4220
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534 break; |
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535 |
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536 case State_SequenceExplicitLength: |
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537 HandleSequenceExplicitLength(block); |
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538 break; |
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539 |
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540 case State_SequenceExplicitValue: |
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541 HandleSequenceExplicitValue(); |
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542 break; |
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543 |
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544 case State_DatasetValue: |
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545 HandleDatasetValue(visitor, block); |
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546 break; |
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|
547 |
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548 default: |
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549 throw OrthancException(ErrorCode_InternalError); |
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550 } |
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|
551 } |
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|
552 else |
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|
553 { |
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554 return; // No more data in the stream |
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555 } |
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|
556 } |
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557 } |
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|
558 |
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559 |
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560 void DicomStreamReader::Consume(IVisitor& visitor) |
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561 { |
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562 DicomTag untilTag(0xffff, 0xffff); |
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|
563 Consume(visitor, untilTag); |
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564 } |
4277
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565 |
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566 |
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567 bool DicomStreamReader::IsDone() const |
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568 { |
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569 return (state_ == State_Done); |
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570 } |
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571 |
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572 |
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573 uint64_t DicomStreamReader::GetProcessedBytes() const |
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574 { |
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575 return reader_.GetProcessedBytes(); |
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576 } |
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577 |
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578 |
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579 class DicomStreamReader::PixelDataVisitor : public DicomStreamReader::IVisitor |
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580 { |
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581 private: |
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582 bool hasPixelData_; |
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583 uint64_t pixelDataOffset_; |
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584 |
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585 public: |
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586 PixelDataVisitor() : |
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587 hasPixelData_(false), |
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588 pixelDataOffset_(0) |
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589 { |
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590 } |
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|
591 |
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592 virtual void VisitMetaHeaderTag(const DicomTag& tag, |
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593 const ValueRepresentation& vr, |
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594 const std::string& value) ORTHANC_OVERRIDE |
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595 { |
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|
596 } |
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|
597 |
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|
598 virtual void VisitTransferSyntax(DicomTransferSyntax transferSyntax) ORTHANC_OVERRIDE |
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|
599 { |
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|
600 } |
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|
601 |
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|
602 virtual bool VisitDatasetTag(const DicomTag& tag, |
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603 const ValueRepresentation& vr, |
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604 const std::string& value, |
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605 bool isLittleEndian, |
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606 uint64_t fileOffset) ORTHANC_OVERRIDE |
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607 { |
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608 if (tag == DICOM_TAG_PIXEL_DATA) |
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609 { |
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610 hasPixelData_ = true; |
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611 pixelDataOffset_ = fileOffset; |
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612 } |
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613 |
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614 // Stop processing once pixel data has been passed |
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615 return (tag < DICOM_TAG_PIXEL_DATA); |
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616 } |
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617 |
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618 bool HasPixelData() const |
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619 { |
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620 return hasPixelData_; |
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621 } |
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622 |
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623 uint64_t GetPixelDataOffset() const |
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624 { |
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625 return pixelDataOffset_; |
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626 } |
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627 |
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628 static bool LookupPixelDataOffset(uint64_t& offset, |
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629 std::istream& stream) |
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630 { |
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631 PixelDataVisitor visitor; |
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632 bool isLittleEndian; |
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633 |
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634 { |
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635 DicomStreamReader reader(stream); |
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636 |
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637 try |
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638 { |
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639 reader.Consume(visitor); |
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640 isLittleEndian = reader.IsLittleEndian(); |
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641 } |
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642 catch (OrthancException& e) |
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643 { |
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644 // Invalid DICOM file |
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645 return false; |
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646 } |
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647 } |
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648 |
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649 if (visitor.HasPixelData()) |
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650 { |
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651 // Sanity check if we face an unsupported DICOM file: Make |
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652 // sure that we can read DICOM_TAG_PIXEL_DATA at the reported |
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653 // position in the stream |
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654 stream.seekg(visitor.GetPixelDataOffset(), stream.beg); |
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655 |
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656 std::string s; |
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657 s.resize(4); |
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658 stream.read(&s[0], s.size()); |
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659 |
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660 if (!isLittleEndian) |
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661 { |
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662 // Byte swapping if reading a file whose transfer syntax is |
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663 // 1.2.840.10008.1.2.2 (big endian explicit) |
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664 std::swap(s[0], s[1]); |
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665 std::swap(s[2], s[3]); |
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666 } |
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667 |
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668 if (stream.gcount() == static_cast<std::streamsize>(s.size()) && |
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669 s[0] == char(0xe0) && |
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670 s[1] == char(0x7f) && |
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671 s[2] == char(0x10) && |
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672 s[3] == char(0x00)) |
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673 { |
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674 offset = visitor.GetPixelDataOffset(); |
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675 return true; |
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676 } |
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677 else |
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678 { |
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679 return false; |
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680 } |
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681 } |
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682 else |
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683 { |
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684 return false; |
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685 } |
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686 } |
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687 }; |
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688 |
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689 |
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690 bool DicomStreamReader::LookupPixelDataOffset(uint64_t& offset, |
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691 const std::string& dicom) |
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692 { |
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693 std::stringstream stream(dicom); |
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694 return PixelDataVisitor::LookupPixelDataOffset(offset, stream); |
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695 } |
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696 |
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697 |
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698 bool DicomStreamReader::LookupPixelDataOffset(uint64_t& offset, |
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699 const void* buffer, |
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700 size_t size) |
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701 { |
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702 boost::iostreams::array_source source(reinterpret_cast<const char*>(buffer), size); |
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703 boost::iostreams::stream<boost::iostreams::array_source> stream(source); |
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704 return PixelDataVisitor::LookupPixelDataOffset(offset, stream); |
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705 } |
4220
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706 } |
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707 |