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1
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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 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "../PrecompiledHeaders.h"
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34 #include "PngReader.h"
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35
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36 #include "../OrthancException.h"
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37 #include "../Toolbox.h"
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38
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54
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39 #if ORTHANC_SANDBOXED == 0
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40 # include "../SystemToolbox.h"
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41 #endif
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42
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1
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43 #include <png.h>
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44 #include <string.h> // For memcpy()
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45
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46 namespace Orthanc
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47 {
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54
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48 #if ORTHANC_SANDBOXED == 0
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1
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49 namespace
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50 {
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51 struct FileRabi
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52 {
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53 FILE* fp_;
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54
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55 FileRabi(const char* filename)
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56 {
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43
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57 fp_ = SystemToolbox::OpenFile(filename, FileMode_ReadBinary);
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1
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58 if (!fp_)
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59 {
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60 throw OrthancException(ErrorCode_InexistentFile);
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61 }
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62 }
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63
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64 ~FileRabi()
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65 {
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66 if (fp_)
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67 {
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68 fclose(fp_);
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69 }
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70 }
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71 };
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72 }
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54
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73 #endif
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1
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74
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75
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76 struct PngReader::PngRabi
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77 {
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78 png_structp png_;
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79 png_infop info_;
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80 png_infop endInfo_;
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81
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82 void Destruct()
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83 {
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84 if (png_)
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85 {
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86 png_destroy_read_struct(&png_, &info_, &endInfo_);
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87
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88 png_ = NULL;
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89 info_ = NULL;
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90 endInfo_ = NULL;
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91 }
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92 }
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93
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94 PngRabi()
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95 {
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96 png_ = NULL;
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97 info_ = NULL;
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98 endInfo_ = NULL;
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99
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100 png_ = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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101 if (!png_)
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102 {
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103 throw OrthancException(ErrorCode_NotEnoughMemory);
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104 }
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105
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106 info_ = png_create_info_struct(png_);
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107 if (!info_)
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108 {
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109 png_destroy_read_struct(&png_, NULL, NULL);
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110 throw OrthancException(ErrorCode_NotEnoughMemory);
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111 }
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112
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113 endInfo_ = png_create_info_struct(png_);
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114 if (!info_)
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115 {
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116 png_destroy_read_struct(&png_, &info_, NULL);
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117 throw OrthancException(ErrorCode_NotEnoughMemory);
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118 }
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119 }
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120
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121 ~PngRabi()
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122 {
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123 Destruct();
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124 }
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125
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126 static void MemoryCallback(png_structp png_ptr,
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127 png_bytep data,
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128 png_size_t size);
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129 };
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130
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131
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132 void PngReader::CheckHeader(const void* header)
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133 {
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134 int is_png = !png_sig_cmp((png_bytep) header, 0, 8);
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135 if (!is_png)
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136 {
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137 throw OrthancException(ErrorCode_BadFileFormat);
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138 }
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139 }
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140
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141 PngReader::PngReader()
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142 {
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143 }
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144
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145 void PngReader::Read(PngRabi& rabi)
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146 {
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147 png_set_sig_bytes(rabi.png_, 8);
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148
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149 png_read_info(rabi.png_, rabi.info_);
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150
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151 png_uint_32 width, height;
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152 int bit_depth, color_type, interlace_type;
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153 int compression_type, filter_method;
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154 // get size and bit-depth of the PNG-image
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155 png_get_IHDR(rabi.png_, rabi.info_,
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156 &width, &height,
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157 &bit_depth, &color_type, &interlace_type,
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158 &compression_type, &filter_method);
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159
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160 PixelFormat format;
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161 unsigned int pitch;
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162
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163 if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 8)
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164 {
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165 format = PixelFormat_Grayscale8;
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166 pitch = width;
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167 }
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168 else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 16)
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169 {
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170 format = PixelFormat_Grayscale16;
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171 pitch = 2 * width;
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172
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173 if (Toolbox::DetectEndianness() == Endianness_Little)
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174 {
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175 png_set_swap(rabi.png_);
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176 }
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177 }
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178 else if (color_type == PNG_COLOR_TYPE_RGB && bit_depth == 8)
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179 {
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180 format = PixelFormat_RGB24;
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181 pitch = 3 * width;
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182 }
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183 else if (color_type == PNG_COLOR_TYPE_RGBA && bit_depth == 8)
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184 {
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185 format = PixelFormat_RGBA32;
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186 pitch = 4 * width;
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187 }
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188 else
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189 {
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190 throw OrthancException(ErrorCode_NotImplemented);
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191 }
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192
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193 data_.resize(height * pitch);
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194
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195 if (height == 0 || width == 0)
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196 {
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197 // Empty image, we are done
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198 AssignEmpty(format);
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199 return;
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200 }
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201
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202 png_read_update_info(rabi.png_, rabi.info_);
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203
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204 std::vector<png_bytep> rows(height);
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205 for (size_t i = 0; i < height; i++)
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206 {
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207 rows[i] = &data_[0] + i * pitch;
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208 }
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209
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210 png_read_image(rabi.png_, &rows[0]);
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211
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212 AssignWritable(format, width, height, pitch, &data_[0]);
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213 }
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214
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54
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215
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216 #if ORTHANC_SANDBOXED == 0
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1
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217 void PngReader::ReadFromFile(const std::string& filename)
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218 {
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219 FileRabi f(filename.c_str());
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220
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221 char header[8];
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222 if (fread(header, 1, 8, f.fp_) != 8)
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223 {
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224 throw OrthancException(ErrorCode_BadFileFormat);
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225 }
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226
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227 CheckHeader(header);
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228
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229 PngRabi rabi;
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230
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231 if (setjmp(png_jmpbuf(rabi.png_)))
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232 {
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233 rabi.Destruct();
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234 throw OrthancException(ErrorCode_BadFileFormat);
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235 }
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236
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237 png_init_io(rabi.png_, f.fp_);
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238
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239 Read(rabi);
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240 }
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54
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241 #endif
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1
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242
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243
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244 namespace
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245 {
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246 struct MemoryBuffer
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247 {
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248 const uint8_t* buffer_;
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249 size_t size_;
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250 size_t pos_;
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251 bool ok_;
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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 void PngReader::PngRabi::MemoryCallback(png_structp png_ptr,
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257 png_bytep outBytes,
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258 png_size_t byteCountToRead)
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259 {
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260 MemoryBuffer* from = reinterpret_cast<MemoryBuffer*>(png_get_io_ptr(png_ptr));
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261
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262 if (!from->ok_)
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263 {
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264 return;
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265 }
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266
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267 if (from->pos_ + byteCountToRead > from->size_)
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268 {
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269 from->ok_ = false;
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270 return;
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271 }
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272
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273 memcpy(outBytes, from->buffer_ + from->pos_, byteCountToRead);
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274
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275 from->pos_ += byteCountToRead;
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276 }
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277
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278
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279 void PngReader::ReadFromMemory(const void* buffer,
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280 size_t size)
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281 {
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282 if (size < 8)
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283 {
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284 throw OrthancException(ErrorCode_BadFileFormat);
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285 }
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286
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287 CheckHeader(buffer);
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288
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289 PngRabi rabi;
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290
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291 if (setjmp(png_jmpbuf(rabi.png_)))
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292 {
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293 rabi.Destruct();
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294 throw OrthancException(ErrorCode_BadFileFormat);
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295 }
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296
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297 MemoryBuffer tmp;
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298 tmp.buffer_ = reinterpret_cast<const uint8_t*>(buffer) + 8; // We skip the header
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299 tmp.size_ = size - 8;
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300 tmp.pos_ = 0;
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301 tmp.ok_ = true;
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302
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303 png_set_read_fn(rabi.png_, &tmp, PngRabi::MemoryCallback);
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304
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305 Read(rabi);
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306
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307 if (!tmp.ok_)
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308 {
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309 throw OrthancException(ErrorCode_BadFileFormat);
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310 }
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311 }
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312
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313 void PngReader::ReadFromMemory(const std::string& buffer)
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314 {
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315 if (buffer.size() != 0)
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316 {
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317 ReadFromMemory(&buffer[0], buffer.size());
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318 }
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319 else
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320 {
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321 ReadFromMemory(NULL, 0);
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322 }
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323 }
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324 }
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