Mercurial > hg > orthanc

annotate OrthancFramework/Sources/Images/PamReader.cpp @ 5013:c074a5827da9

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author Alain Mazy <am@osimis.io>
date Wed, 08 Jun 2022 15:46:24 +0200
parents 43e613a7756b
children 0ea402b4d901
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #include "../PrecompiledHeaders.h"
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25 #include "PamReader.h"
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26
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27 #include "../Endianness.h"
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28 #include "../Logging.h"
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29 #include "../OrthancException.h"
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30 #include "../Toolbox.h"
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31
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32 #if ORTHANC_SANDBOXED == 0
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33 # include "../SystemToolbox.h"
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34 #endif
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35
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36 #include <stdlib.h> // For malloc/free
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37 #include <boost/algorithm/string/find.hpp>
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38 #include <boost/lexical_cast.hpp>
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39
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40
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41 namespace Orthanc
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42 {
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43 static void GetPixelFormat(PixelFormat& format,
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44 unsigned int& bytesPerChannel,
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45 const unsigned int& maxValue,
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46 const unsigned int& channelCount,
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47 const std::string& tupleType)
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48 {
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49 if (tupleType == "GRAYSCALE" &&
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50 channelCount == 1)
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51 {
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52 switch (maxValue)
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53 {
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54 case 255:
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55 format = PixelFormat_Grayscale8;
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56 bytesPerChannel = 1;
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57 return;
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58
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59 case 65535:
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60 format = PixelFormat_Grayscale16;
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61 bytesPerChannel = 2;
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62 return;
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63
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64 default:
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65 throw OrthancException(ErrorCode_NotImplemented);
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66 }
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67 }
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68 else if (tupleType == "RGB" &&
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69 channelCount == 3)
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70 {
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71 switch (maxValue)
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72 {
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73 case 255:
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74 format = PixelFormat_RGB24;
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75 bytesPerChannel = 1;
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76 return;
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77
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78 case 65535:
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79 format = PixelFormat_RGB48;
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80 bytesPerChannel = 2;
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81 return;
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82
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83 default:
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84 throw OrthancException(ErrorCode_NotImplemented);
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85 }
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86 }
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87 else
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88 {
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89 throw OrthancException(ErrorCode_NotImplemented);
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90 }
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91 }
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92
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93
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94 typedef std::map<std::string, std::string> Parameters;
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95
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96
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97 static std::string LookupStringParameter(const Parameters& parameters,
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98 const std::string& key)
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99 {
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100 Parameters::const_iterator found = parameters.find(key);
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101
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102 if (found == parameters.end())
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103 {
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104 throw OrthancException(ErrorCode_BadFileFormat);
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105 }
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106 else
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107 {
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108 return found->second;
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109 }
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110 }
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111
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112
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113 static unsigned int LookupIntegerParameter(const Parameters& parameters,
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114 const std::string& key)
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115 {
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116 try
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117 {
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118 int value = boost::lexical_cast<int>(LookupStringParameter(parameters, key));
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119
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120 if (value < 0)
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121 {
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122 throw OrthancException(ErrorCode_BadFileFormat);
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123 }
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124 else
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125 {
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126 return static_cast<unsigned int>(value);
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127 }
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128 }
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129 catch (boost::bad_lexical_cast&)
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130 {
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131 throw OrthancException(ErrorCode_BadFileFormat);
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132 }
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133 }
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134
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135
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136 void PamReader::ParseContent()
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137 {
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138 static const std::string headerDelimiter = "ENDHDR\n";
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139
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140 boost::iterator_range<std::string::const_iterator> headerRange =
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141 boost::algorithm::find_first(content_, headerDelimiter);
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142
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143 if (!headerRange)
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144 {
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145 throw OrthancException(ErrorCode_BadFileFormat);
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146 }
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147
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148 std::string header(static_cast<const std::string&>(content_).begin(), headerRange.begin());
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149
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150 std::vector<std::string> lines;
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151 Toolbox::TokenizeString(lines, header, '\n');
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152
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153 if (lines.size() < 2 ||
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154 lines.front() != "P7" ||
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155 !lines.back().empty())
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156 {
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157 throw OrthancException(ErrorCode_BadFileFormat);
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158 }
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159
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160 Parameters parameters;
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161
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162 for (size_t i = 1; i + 1 < lines.size(); i++)
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163 {
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164 std::vector<std::string> tokens;
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165 Toolbox::TokenizeString(tokens, lines[i], ' ');
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166
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167 if (tokens.size() != 2)
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168 {
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169 throw OrthancException(ErrorCode_BadFileFormat);
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170 }
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171 else
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172 {
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173 parameters[tokens[0]] = tokens[1];
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174 }
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175 }
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176
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177 const unsigned int width = LookupIntegerParameter(parameters, "WIDTH");
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178 const unsigned int height = LookupIntegerParameter(parameters, "HEIGHT");
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179 const unsigned int channelCount = LookupIntegerParameter(parameters, "DEPTH");
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180 const unsigned int maxValue = LookupIntegerParameter(parameters, "MAXVAL");
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181 const std::string tupleType = LookupStringParameter(parameters, "TUPLTYPE");
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182
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183 unsigned int bytesPerChannel;
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184 PixelFormat format;
4201
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185 GetPixelFormat(format, bytesPerChannel, maxValue, channelCount, tupleType);
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186
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187 unsigned int pitch = width * channelCount * bytesPerChannel;
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188
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189 if (content_.size() != header.size() + headerDelimiter.size() + pitch * height)
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190 {
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191 throw OrthancException(ErrorCode_BadFileFormat);
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192 }
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193
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194 size_t offset = content_.size() - pitch * height;
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195
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196 {
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197 intptr_t bufferAddr = reinterpret_cast<intptr_t>(&content_[offset]);
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198 if((bufferAddr % 8) == 0)
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199 LOG(TRACE) << "PamReader::ParseContent() image address = " << bufferAddr;
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200 else
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201 LOG(TRACE) << "PamReader::ParseContent() image address = " << bufferAddr << " (not a multiple of 8!)";
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202 }
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203
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204 // if we want to enforce alignment, we need to use a freshly allocated
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205 // buffer, since we have no alignment guarantees on the original one
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206 if (enforceAligned_)
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207 {
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208 if (alignedImageBuffer_ != NULL)
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209 free(alignedImageBuffer_);
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210 alignedImageBuffer_ = malloc(pitch * height);
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211 memcpy(alignedImageBuffer_, &content_[offset], pitch* height);
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212 content_ = "";
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213 AssignWritable(format, width, height, pitch, alignedImageBuffer_);
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214 }
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215 else
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216 {
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217 AssignWritable(format, width, height, pitch, &content_[offset]);
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218 }
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219
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220 // Byte swapping if needed
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221 if (bytesPerChannel != 1 &&
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222 bytesPerChannel != 2)
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223 {
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224 throw OrthancException(ErrorCode_NotImplemented);
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225 }
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226
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227 if (Toolbox::DetectEndianness() == Endianness_Little &&
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228 bytesPerChannel == 2)
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229 {
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230 for (unsigned int h = 0; h < height; ++h)
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231 {
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232 uint16_t* pixel = reinterpret_cast<uint16_t*>(GetRow(h));
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diff changeset
233
4278
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234 for (unsigned int w = 0; w < width; ++w, ++pixel)
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235 {
4325
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236 /**
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237 * This is Little-Endian computer, and PAM uses
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238 * Big-Endian. Need to do a 16-bit swap. We DON'T use
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239 * "htobe16()", as the latter only works if the "pixel"
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240 * pointer is 16-bit aligned (which is not the case if
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241 * "offset" is an odd number), and the trick that was used
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242 * in Orthanc <= 1.8.0 (i.e. make a "memcpy()" to a local
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243 * uint16_t variable) doesn't seem work for WebAssembly. We
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244 * thus use a plain old C implementation. Check out issue
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245 * #99: https://bugs.orthanc-server.com/show_bug.cgi?id=99
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diff changeset
246 *
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diff changeset
247 * Here is the crash log on WebAssembly (2019-08-05):
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248 *
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249 * Uncaught abort(alignment fault) at Error
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diff changeset
250 * at jsStackTrace
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diff changeset
251 * at stackTrace
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252 * at abort
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253 * at alignfault
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254 * at SAFE_HEAP_LOAD_i32_2_2 (wasm-function[251132]:39)
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255 * at __ZN7Orthanc9PamReader12ParseContentEv (wasm-function[11457]:8088)
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diff changeset
256 **/
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257 uint8_t* srcdst = reinterpret_cast<uint8_t*>(pixel);
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258 uint8_t tmp = srcdst[0];
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259 srcdst[0] = srcdst[1];
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260 srcdst[1] = tmp;
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261 }
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262 }
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263 }
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264 }
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265
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266 PamReader::PamReader(bool enforceAligned) :
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267 enforceAligned_(enforceAligned),
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268 alignedImageBuffer_(NULL)
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269 {
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270 }
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271
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272
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273 #if ORTHANC_SANDBOXED == 0
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274 void PamReader::ReadFromFile(const std::string& filename)
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275 {
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276 SystemToolbox::ReadFile(content_, filename);
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277 ParseContent();
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278 }
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279 #endif
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280
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281
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282 void PamReader::ReadFromMemory(const std::string& buffer)
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283 {
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284 content_ = buffer;
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285 ParseContent();
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286 }
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287
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288 void PamReader::ReadFromMemory(const void* buffer,
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289 size_t size)
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290 {
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291 content_.assign(reinterpret_cast<const char*>(buffer), size);
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292 ParseContent();
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293 }
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294
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295 PamReader::~PamReader()
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296 {
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297 if (alignedImageBuffer_ != NULL)
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298 {
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299 free(alignedImageBuffer_);
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300 }
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301 }
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302 }