Mercurial > hg > orthanc-stone
annotate Resources/Orthanc/Core/Images/PngReader.cpp @ 208:db70f6c5fa4f
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 11 Apr 2018 16:27:09 +0200 |
parents | 03afbee0cc7b |
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rev | line source |
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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) 2017-2018 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 "PngReader.h" |
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36 |
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37 #include "../OrthancException.h" |
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38 #include "../Toolbox.h" |
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39 |
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40 #if ORTHANC_SANDBOXED == 0 |
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41 # include "../SystemToolbox.h" |
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42 #endif |
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43 |
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44 #include <png.h> |
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45 #include <string.h> // For memcpy() |
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46 |
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47 namespace Orthanc |
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48 { |
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49 #if ORTHANC_SANDBOXED == 0 |
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50 namespace |
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51 { |
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52 struct FileRabi |
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53 { |
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54 FILE* fp_; |
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55 |
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56 FileRabi(const char* filename) |
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57 { |
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58 fp_ = SystemToolbox::OpenFile(filename, FileMode_ReadBinary); |
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59 if (!fp_) |
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60 { |
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61 throw OrthancException(ErrorCode_InexistentFile); |
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62 } |
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63 } |
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64 |
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65 ~FileRabi() |
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66 { |
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67 if (fp_) |
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68 { |
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69 fclose(fp_); |
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70 } |
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71 } |
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72 }; |
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73 } |
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74 #endif |
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75 |
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76 |
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77 struct PngReader::PngRabi |
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78 { |
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79 png_structp png_; |
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80 png_infop info_; |
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81 png_infop endInfo_; |
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82 |
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83 void Destruct() |
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84 { |
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85 if (png_) |
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86 { |
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87 png_destroy_read_struct(&png_, &info_, &endInfo_); |
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88 |
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89 png_ = NULL; |
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90 info_ = NULL; |
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91 endInfo_ = NULL; |
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92 } |
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93 } |
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94 |
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95 PngRabi() |
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96 { |
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97 png_ = NULL; |
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98 info_ = NULL; |
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99 endInfo_ = NULL; |
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100 |
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101 png_ = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); |
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102 if (!png_) |
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103 { |
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104 throw OrthancException(ErrorCode_NotEnoughMemory); |
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105 } |
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106 |
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107 info_ = png_create_info_struct(png_); |
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108 if (!info_) |
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109 { |
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110 png_destroy_read_struct(&png_, NULL, NULL); |
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111 throw OrthancException(ErrorCode_NotEnoughMemory); |
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112 } |
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113 |
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114 endInfo_ = png_create_info_struct(png_); |
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115 if (!info_) |
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116 { |
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117 png_destroy_read_struct(&png_, &info_, NULL); |
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118 throw OrthancException(ErrorCode_NotEnoughMemory); |
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119 } |
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120 } |
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121 |
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122 ~PngRabi() |
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123 { |
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124 Destruct(); |
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125 } |
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126 |
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127 static void MemoryCallback(png_structp png_ptr, |
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128 png_bytep data, |
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129 png_size_t size); |
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130 }; |
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131 |
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132 |
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133 void PngReader::CheckHeader(const void* header) |
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134 { |
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135 int is_png = !png_sig_cmp((png_bytep) header, 0, 8); |
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136 if (!is_png) |
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137 { |
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138 throw OrthancException(ErrorCode_BadFileFormat); |
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139 } |
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140 } |
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141 |
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142 PngReader::PngReader() |
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143 { |
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144 } |
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145 |
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146 void PngReader::Read(PngRabi& rabi) |
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147 { |
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148 png_set_sig_bytes(rabi.png_, 8); |
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149 |
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150 png_read_info(rabi.png_, rabi.info_); |
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151 |
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152 png_uint_32 width, height; |
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153 int bit_depth, color_type, interlace_type; |
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154 int compression_type, filter_method; |
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155 // get size and bit-depth of the PNG-image |
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156 png_get_IHDR(rabi.png_, rabi.info_, |
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157 &width, &height, |
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158 &bit_depth, &color_type, &interlace_type, |
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159 &compression_type, &filter_method); |
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160 |
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161 PixelFormat format; |
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162 unsigned int pitch; |
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163 |
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164 if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 8) |
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165 { |
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166 format = PixelFormat_Grayscale8; |
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167 pitch = width; |
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168 } |
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169 else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 16) |
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170 { |
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171 format = PixelFormat_Grayscale16; |
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172 pitch = 2 * width; |
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173 |
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174 if (Toolbox::DetectEndianness() == Endianness_Little) |
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175 { |
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176 png_set_swap(rabi.png_); |
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177 } |
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178 } |
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179 else if (color_type == PNG_COLOR_TYPE_RGB && bit_depth == 8) |
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180 { |
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181 format = PixelFormat_RGB24; |
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182 pitch = 3 * width; |
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183 } |
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184 else if (color_type == PNG_COLOR_TYPE_RGBA && bit_depth == 8) |
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185 { |
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186 format = PixelFormat_RGBA32; |
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187 pitch = 4 * width; |
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188 } |
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189 else |
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190 { |
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191 throw OrthancException(ErrorCode_NotImplemented); |
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192 } |
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193 |
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194 data_.resize(height * pitch); |
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195 |
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196 if (height == 0 || width == 0) |
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197 { |
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198 // Empty image, we are done |
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199 AssignEmpty(format); |
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200 return; |
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201 } |
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202 |
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203 png_read_update_info(rabi.png_, rabi.info_); |
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204 |
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205 std::vector<png_bytep> rows(height); |
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206 for (size_t i = 0; i < height; i++) |
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207 { |
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208 rows[i] = &data_[0] + i * pitch; |
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209 } |
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210 |
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211 png_read_image(rabi.png_, &rows[0]); |
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212 |
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213 AssignWritable(format, width, height, pitch, &data_[0]); |
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214 } |
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215 |
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216 |
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217 #if ORTHANC_SANDBOXED == 0 |
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218 void PngReader::ReadFromFile(const std::string& filename) |
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219 { |
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220 FileRabi f(filename.c_str()); |
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221 |
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222 char header[8]; |
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223 if (fread(header, 1, 8, f.fp_) != 8) |
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224 { |
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225 throw OrthancException(ErrorCode_BadFileFormat); |
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226 } |
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227 |
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228 CheckHeader(header); |
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229 |
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230 PngRabi rabi; |
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231 |
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232 if (setjmp(png_jmpbuf(rabi.png_))) |
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233 { |
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234 rabi.Destruct(); |
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235 throw OrthancException(ErrorCode_BadFileFormat); |
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236 } |
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237 |
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238 png_init_io(rabi.png_, f.fp_); |
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239 |
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240 Read(rabi); |
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241 } |
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242 #endif |
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243 |
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244 |
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245 namespace |
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246 { |
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247 struct MemoryBuffer |
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248 { |
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249 const uint8_t* buffer_; |
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250 size_t size_; |
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251 size_t pos_; |
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252 bool ok_; |
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253 }; |
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254 } |
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255 |
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256 |
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257 void PngReader::PngRabi::MemoryCallback(png_structp png_ptr, |
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258 png_bytep outBytes, |
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259 png_size_t byteCountToRead) |
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260 { |
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261 MemoryBuffer* from = reinterpret_cast<MemoryBuffer*>(png_get_io_ptr(png_ptr)); |
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262 |
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263 if (!from->ok_) |
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264 { |
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265 return; |
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266 } |
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267 |
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268 if (from->pos_ + byteCountToRead > from->size_) |
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269 { |
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270 from->ok_ = false; |
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271 return; |
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272 } |
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273 |
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274 memcpy(outBytes, from->buffer_ + from->pos_, byteCountToRead); |
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275 |
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276 from->pos_ += byteCountToRead; |
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277 } |
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278 |
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279 |
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280 void PngReader::ReadFromMemory(const void* buffer, |
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281 size_t size) |
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282 { |
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283 if (size < 8) |
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284 { |
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285 throw OrthancException(ErrorCode_BadFileFormat); |
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286 } |
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287 |
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288 CheckHeader(buffer); |
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289 |
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290 PngRabi rabi; |
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291 |
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292 if (setjmp(png_jmpbuf(rabi.png_))) |
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293 { |
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294 rabi.Destruct(); |
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295 throw OrthancException(ErrorCode_BadFileFormat); |
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296 } |
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297 |
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298 MemoryBuffer tmp; |
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299 tmp.buffer_ = reinterpret_cast<const uint8_t*>(buffer) + 8; // We skip the header |
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300 tmp.size_ = size - 8; |
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301 tmp.pos_ = 0; |
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302 tmp.ok_ = true; |
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303 |
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304 png_set_read_fn(rabi.png_, &tmp, PngRabi::MemoryCallback); |
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305 |
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306 Read(rabi); |
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307 |
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308 if (!tmp.ok_) |
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309 { |
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310 throw OrthancException(ErrorCode_BadFileFormat); |
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311 } |
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312 } |
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313 |
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314 void PngReader::ReadFromMemory(const std::string& buffer) |
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315 { |
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316 if (buffer.size() != 0) |
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317 { |
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318 ReadFromMemory(&buffer[0], buffer.size()); |
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319 } |
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320 else |
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321 { |
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322 ReadFromMemory(NULL, 0); |
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323 } |
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324 } |
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325 } |