Mercurial > hg > orthanc

annotate Core/Images/PamReader.cpp @ 3549:fab5777f4dd4

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ImageProcessing::FitSize()
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 25 Oct 2019 18:09:27 +0200
parents ce29644acd19
children 94f4a18a79cc
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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) 2017-2019 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 General Public License as
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9 * published by the Free Software Foundation, either version 3 of the
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10 * License, or (at your option) any later version.
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11 *
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12 * In addition, as a special exception, the copyright holders of this
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13 * program give permission to link the code of its release with the
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14 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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15 * that use the same license as the "OpenSSL" library), and distribute
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16 * the linked executables. You must obey the GNU General Public License
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17 * in all respects for all of the code used other than "OpenSSL". If you
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18 * modify file(s) with this exception, you may extend this exception to
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19 * your version of the file(s), but you are not obligated to do so. If
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20 * you do not wish to do so, delete this exception statement from your
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21 * version. If you delete this exception statement from all source files
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22 * in the program, then also delete it here.
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23 *
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24 * This program is distributed in the hope that it will be useful, but
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25 * WITHOUT ANY WARRANTY; without even the implied warranty of
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26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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27 * General Public License for more details.
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28 *
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29 * You should have received a copy of the GNU General Public License
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30 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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31 **/
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32
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33
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34 #include "../PrecompiledHeaders.h"
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35 #include "PamReader.h"
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36
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37 #include "../Endianness.h"
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38 #include "../OrthancException.h"
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39 #include "../Toolbox.h"
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40
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41 #if ORTHANC_SANDBOXED == 0
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42 # include "../SystemToolbox.h"
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43 #endif
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44
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45 #include <boost/algorithm/string/find.hpp>
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46 #include <boost/lexical_cast.hpp>
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47
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48
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49 namespace Orthanc
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50 {
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51 static void GetPixelFormat(PixelFormat& format,
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52 unsigned int& bytesPerChannel,
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53 const unsigned int& maxValue,
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54 const unsigned int& channelCount,
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55 const std::string& tupleType)
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56 {
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57 if (tupleType == "GRAYSCALE" &&
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58 channelCount == 1)
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59 {
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60 switch (maxValue)
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61 {
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62 case 255:
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63 format = PixelFormat_Grayscale8;
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64 bytesPerChannel = 1;
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65 return;
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66
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67 case 65535:
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68 format = PixelFormat_Grayscale16;
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69 bytesPerChannel = 2;
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70 return;
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71
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72 default:
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73 throw OrthancException(ErrorCode_NotImplemented);
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74 }
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75 }
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76 else if (tupleType == "RGB" &&
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77 channelCount == 3)
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78 {
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79 switch (maxValue)
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80 {
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81 case 255:
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82 format = PixelFormat_RGB24;
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83 bytesPerChannel = 1;
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84 return;
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85
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86 case 65535:
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87 format = PixelFormat_RGB48;
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88 bytesPerChannel = 2;
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89 return;
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90
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91 default:
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92 throw OrthancException(ErrorCode_NotImplemented);
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93 }
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94 }
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95 else
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96 {
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97 throw OrthancException(ErrorCode_NotImplemented);
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98 }
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99 }
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100
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101
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102 typedef std::map<std::string, std::string> Parameters;
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103
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104
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105 static std::string LookupStringParameter(const Parameters& parameters,
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106 const std::string& key)
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107 {
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108 Parameters::const_iterator found = parameters.find(key);
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109
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110 if (found == parameters.end())
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111 {
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112 throw OrthancException(ErrorCode_BadFileFormat);
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113 }
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114 else
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115 {
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116 return found->second;
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117 }
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118 }
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119
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120
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121 static unsigned int LookupIntegerParameter(const Parameters& parameters,
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122 const std::string& key)
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123 {
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124 try
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125 {
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126 int value = boost::lexical_cast<int>(LookupStringParameter(parameters, key));
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127
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128 if (value < 0)
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129 {
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130 throw OrthancException(ErrorCode_BadFileFormat);
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131 }
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132 else
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133 {
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134 return static_cast<unsigned int>(value);
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135 }
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136 }
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137 catch (boost::bad_lexical_cast&)
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138 {
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139 throw OrthancException(ErrorCode_BadFileFormat);
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140 }
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141 }
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142
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143
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144 void PamReader::ParseContent()
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145 {
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146 static const std::string headerDelimiter = "ENDHDR\n";
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147
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148 boost::iterator_range<std::string::const_iterator> headerRange =
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149 boost::algorithm::find_first(content_, headerDelimiter);
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150
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151 if (!headerRange)
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152 {
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153 throw OrthancException(ErrorCode_BadFileFormat);
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154 }
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155
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156 std::string header(static_cast<const std::string&>(content_).begin(), headerRange.begin());
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157
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158 std::vector<std::string> lines;
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159 Toolbox::TokenizeString(lines, header, '\n');
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160
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161 if (lines.size() < 2 ||
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162 lines.front() != "P7" ||
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163 !lines.back().empty())
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164 {
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165 throw OrthancException(ErrorCode_BadFileFormat);
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166 }
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167
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168 Parameters parameters;
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169
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170 for (size_t i = 1; i + 1 < lines.size(); i++)
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171 {
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172 std::vector<std::string> tokens;
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173 Toolbox::TokenizeString(tokens, lines[i], ' ');
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174
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175 if (tokens.size() != 2)
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176 {
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177 throw OrthancException(ErrorCode_BadFileFormat);
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178 }
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179 else
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180 {
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181 parameters[tokens[0]] = tokens[1];
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182 }
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183 }
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184
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185 const unsigned int width = LookupIntegerParameter(parameters, "WIDTH");
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186 const unsigned int height = LookupIntegerParameter(parameters, "HEIGHT");
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187 const unsigned int channelCount = LookupIntegerParameter(parameters, "DEPTH");
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188 const unsigned int maxValue = LookupIntegerParameter(parameters, "MAXVAL");
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189 const std::string tupleType = LookupStringParameter(parameters, "TUPLTYPE");
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190
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191 unsigned int bytesPerChannel;
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192 PixelFormat format;
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193 GetPixelFormat(format, bytesPerChannel, maxValue, channelCount, tupleType.c_str());
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194
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195 unsigned int pitch = width * channelCount * bytesPerChannel;
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196
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197 if (content_.size() != header.size() + headerDelimiter.size() + pitch * height)
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198 {
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199 throw OrthancException(ErrorCode_BadFileFormat);
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200 }
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201
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202 size_t offset = content_.size() - pitch * height;
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203 AssignWritable(format, width, height, pitch, &content_[offset]);
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204
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205 // Byte swapping if needed
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206 if (bytesPerChannel != 1 &&
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207 bytesPerChannel != 2)
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208 {
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209 throw OrthancException(ErrorCode_NotImplemented);
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210 }
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211
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212 if (Toolbox::DetectEndianness() == Endianness_Little &&
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213 bytesPerChannel == 2)
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214 {
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215 for (unsigned int h = 0; h < height; ++h)
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216 {
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217 uint16_t* pixel = reinterpret_cast<uint16_t*>(GetRow(h));
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218
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219 for (unsigned int w = 0; w < GetWidth(); ++w, ++pixel)
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220 {
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221 #if ORTHANC_ENABLE_WASM == 1
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222 /*
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223
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224 crash (2019-08-05):
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225
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226 Uncaught abort(alignment fault) at Error
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227 at jsStackTrace
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228 at stackTrace
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229 at abort
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230 at alignfault
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231 at SAFE_HEAP_LOAD_i32_2_2 (wasm-function[251132]:39)
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232 at __ZN7Orthanc9PamReader12ParseContentEv (wasm-function[11457]:8088)
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233
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234 Web Assenmbly IS LITTLE ENDIAN!
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235
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236 Perhaps in htobe16 ?
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237 */
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238 uint8_t* srcdst = reinterpret_cast<uint8_t*>(pixel);
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239 uint8_t tmp = srcdst[0];
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240 srcdst[0] = srcdst[1];
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241 srcdst[1] = tmp;
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242 #else
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243 // memcpy() is necessary to avoid segmentation fault if the
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244 // "pixel" pointer is not 16-bit aligned (which is the case
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245 // if "offset" is an odd number). Check out issue #99:
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246 // https://bitbucket.org/sjodogne/orthanc/issues/99
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247 uint16_t v = htobe16(*pixel);
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248 memcpy(pixel, &v, sizeof(v));
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249 #endif
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250 }
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251 }
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252 }
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253 }
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254
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255
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256 #if ORTHANC_SANDBOXED == 0
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257 void PamReader::ReadFromFile(const std::string& filename)
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258 {
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259 SystemToolbox::ReadFile(content_, filename);
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260 ParseContent();
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261 }
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262 #endif
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263
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264
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265 void PamReader::ReadFromMemory(const std::string& buffer)
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266 {
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267 content_ = buffer;
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268 ParseContent();
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269 }
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270
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271 void PamReader::ReadFromMemory(const void* buffer,
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272 size_t size)
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273 {
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274 content_.assign(reinterpret_cast<const char*>(buffer), size);
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275 ParseContent();
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276 }
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277 }