Mercurial > hg > orthanc

annotate OrthancFramework/Sources/Images/PamReader.cpp @ 4201:2d5209153b32

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 17 Sep 2020 08:18:28 +0200
parents bf7b9edf6b81
children 9279de56a405
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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) 2017-2020 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 #include "../PrecompiledHeaders.h"
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24 #include "PamReader.h"
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25
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26 #include "../Endianness.h"
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27 #include "../OrthancException.h"
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28 #include "../Toolbox.h"
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29
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30 #if ORTHANC_SANDBOXED == 0
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31 # include "../SystemToolbox.h"
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32 #endif
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33
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34 #include <stdlib.h> // For malloc/free
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35 #include <boost/algorithm/string/find.hpp>
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36 #include <boost/lexical_cast.hpp>
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37
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38
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39 namespace Orthanc
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40 {
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41 static void GetPixelFormat(PixelFormat& format,
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42 unsigned int& bytesPerChannel,
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43 const unsigned int& maxValue,
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44 const unsigned int& channelCount,
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45 const std::string& tupleType)
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46 {
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47 if (tupleType == "GRAYSCALE" &&
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48 channelCount == 1)
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49 {
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50 switch (maxValue)
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51 {
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52 case 255:
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53 format = PixelFormat_Grayscale8;
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54 bytesPerChannel = 1;
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55 return;
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56
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57 case 65535:
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58 format = PixelFormat_Grayscale16;
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59 bytesPerChannel = 2;
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60 return;
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61
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62 default:
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63 throw OrthancException(ErrorCode_NotImplemented);
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64 }
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65 }
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66 else if (tupleType == "RGB" &&
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67 channelCount == 3)
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68 {
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69 switch (maxValue)
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70 {
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71 case 255:
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72 format = PixelFormat_RGB24;
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73 bytesPerChannel = 1;
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74 return;
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75
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76 case 65535:
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77 format = PixelFormat_RGB48;
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78 bytesPerChannel = 2;
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79 return;
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80
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81 default:
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82 throw OrthancException(ErrorCode_NotImplemented);
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83 }
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84 }
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85 else
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86 {
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87 throw OrthancException(ErrorCode_NotImplemented);
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88 }
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89 }
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90
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91
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92 typedef std::map<std::string, std::string> Parameters;
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93
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94
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95 static std::string LookupStringParameter(const Parameters& parameters,
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96 const std::string& key)
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97 {
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98 Parameters::const_iterator found = parameters.find(key);
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99
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100 if (found == parameters.end())
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101 {
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102 throw OrthancException(ErrorCode_BadFileFormat);
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103 }
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104 else
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105 {
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106 return found->second;
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107 }
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108 }
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109
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110
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111 static unsigned int LookupIntegerParameter(const Parameters& parameters,
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112 const std::string& key)
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113 {
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114 try
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115 {
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116 int value = boost::lexical_cast<int>(LookupStringParameter(parameters, key));
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117
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118 if (value < 0)
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119 {
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120 throw OrthancException(ErrorCode_BadFileFormat);
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121 }
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122 else
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123 {
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124 return static_cast<unsigned int>(value);
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125 }
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126 }
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127 catch (boost::bad_lexical_cast&)
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128 {
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129 throw OrthancException(ErrorCode_BadFileFormat);
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130 }
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131 }
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132
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133
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134 void PamReader::ParseContent()
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135 {
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136 static const std::string headerDelimiter = "ENDHDR\n";
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137
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138 boost::iterator_range<std::string::const_iterator> headerRange =
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139 boost::algorithm::find_first(content_, headerDelimiter);
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140
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141 if (!headerRange)
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142 {
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143 throw OrthancException(ErrorCode_BadFileFormat);
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144 }
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145
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146 std::string header(static_cast<const std::string&>(content_).begin(), headerRange.begin());
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147
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148 std::vector<std::string> lines;
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149 Toolbox::TokenizeString(lines, header, '\n');
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150
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151 if (lines.size() < 2 ||
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152 lines.front() != "P7" ||
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153 !lines.back().empty())
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154 {
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155 throw OrthancException(ErrorCode_BadFileFormat);
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156 }
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157
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158 Parameters parameters;
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159
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160 for (size_t i = 1; i + 1 < lines.size(); i++)
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161 {
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162 std::vector<std::string> tokens;
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163 Toolbox::TokenizeString(tokens, lines[i], ' ');
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164
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165 if (tokens.size() != 2)
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166 {
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167 throw OrthancException(ErrorCode_BadFileFormat);
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168 }
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169 else
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170 {
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171 parameters[tokens[0]] = tokens[1];
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172 }
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173 }
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174
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175 const unsigned int width = LookupIntegerParameter(parameters, "WIDTH");
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176 const unsigned int height = LookupIntegerParameter(parameters, "HEIGHT");
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177 const unsigned int channelCount = LookupIntegerParameter(parameters, "DEPTH");
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178 const unsigned int maxValue = LookupIntegerParameter(parameters, "MAXVAL");
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179 const std::string tupleType = LookupStringParameter(parameters, "TUPLTYPE");
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180
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181 unsigned int bytesPerChannel;
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182 PixelFormat format;
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183 GetPixelFormat(format, bytesPerChannel, maxValue, channelCount, tupleType);
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184
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185 unsigned int pitch = width * channelCount * bytesPerChannel;
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186
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187 if (content_.size() != header.size() + headerDelimiter.size() + pitch * height)
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188 {
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189 throw OrthancException(ErrorCode_BadFileFormat);
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190 }
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191
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192 size_t offset = content_.size() - pitch * height;
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193
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194 {
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195 intptr_t bufferAddr = reinterpret_cast<intptr_t>(&content_[offset]);
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196 if((bufferAddr % 8) == 0)
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197 LOG(TRACE) << "PamReader::ParseContent() image address = " << bufferAddr;
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198 else
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199 LOG(TRACE) << "PamReader::ParseContent() image address = " << bufferAddr << " (not a multiple of 8!)";
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200 }
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201
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202 // if we want to enforce alignment, we need to use a freshly allocated
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203 // buffer, since we have no alignment guarantees on the original one
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204 if (enforceAligned_)
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205 {
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206 if (alignedImageBuffer_ != NULL)
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207 free(alignedImageBuffer_);
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208 alignedImageBuffer_ = malloc(pitch * height);
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209 memcpy(alignedImageBuffer_, &content_[offset], pitch* height);
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210 content_ = "";
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211 AssignWritable(format, width, height, pitch, alignedImageBuffer_);
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212 }
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213 else
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214 {
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215 AssignWritable(format, width, height, pitch, &content_[offset]);
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216 }
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217
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218 // Byte swapping if needed
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219 if (bytesPerChannel != 1 &&
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220 bytesPerChannel != 2)
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221 {
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222 throw OrthancException(ErrorCode_NotImplemented);
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223 }
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224
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225 if (Toolbox::DetectEndianness() == Endianness_Little &&
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226 bytesPerChannel == 2)
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227 {
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228 for (unsigned int h = 0; h < height; ++h)
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229 {
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230 uint16_t* pixel = reinterpret_cast<uint16_t*>(GetRow(h));
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231
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232 for (unsigned int w = 0; w < GetWidth(); ++w, ++pixel)
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233 {
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234 #if defined(__EMSCRIPTEN__) // For WebAssembly
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235 /*
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236
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237 crash (2019-08-05):
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238
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239 Uncaught abort(alignment fault) at Error
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240 at jsStackTrace
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241 at stackTrace
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242 at abort
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243 at alignfault
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244 at SAFE_HEAP_LOAD_i32_2_2 (wasm-function[251132]:39)
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245 at __ZN7Orthanc9PamReader12ParseContentEv (wasm-function[11457]:8088)
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246
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247 Web Assembly IS LITTLE ENDIAN!
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248
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249 Perhaps in htobe16 ?
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250 */
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251 uint8_t* srcdst = reinterpret_cast<uint8_t*>(pixel);
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252 uint8_t tmp = srcdst[0];
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253 srcdst[0] = srcdst[1];
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254 srcdst[1] = tmp;
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255 #else
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256 // memcpy() is necessary to avoid segmentation fault if the
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257 // "pixel" pointer is not 16-bit aligned (which is the case
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258 // if "offset" is an odd number). Check out issue #99:
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259 // https://bitbucket.org/sjodogne/orthanc/issues/99
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260 uint16_t v = htobe16(*pixel);
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261 memcpy(pixel, &v, sizeof(v));
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262 #endif
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263 }
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264 }
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265 }
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266 }
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267
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268
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269 #if ORTHANC_SANDBOXED == 0
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270 void PamReader::ReadFromFile(const std::string& filename)
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271 {
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272 SystemToolbox::ReadFile(content_, filename);
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273 ParseContent();
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274 }
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275 #endif
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276
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277
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278 void PamReader::ReadFromMemory(const std::string& buffer)
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279 {
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280 content_ = buffer;
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281 ParseContent();
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282 }
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283
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284 void PamReader::ReadFromMemory(const void* buffer,
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285 size_t size)
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286 {
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287 content_.assign(reinterpret_cast<const char*>(buffer), size);
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288 ParseContent();
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289 }
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290
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291 PamReader::~PamReader()
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292 {
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293 if (alignedImageBuffer_ != NULL)
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294 {
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295 free(alignedImageBuffer_);
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296 }
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297 }
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298 }