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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2013 Medical Physics Department, CHU of Liege,
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4 * 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 "PngReader.h"
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34
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35 #include "../OrthancException.h"
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36 #include "../Toolbox.h"
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37
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38 #include <png.h>
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39
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40 namespace Orthanc
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41 {
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42 namespace
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43 {
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44 struct FileRabi
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45 {
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46 FILE* fp_;
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47
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48 FileRabi(const char* filename)
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49 {
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50 fp_ = fopen(filename, "rb");
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51 if (!fp_)
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52 {
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53 throw OrthancException(ErrorCode_InexistentFile);
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54 }
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55 }
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56
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57 ~FileRabi()
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58 {
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59 if (fp_)
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60 fclose(fp_);
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61 }
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62 };
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63 }
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64
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65
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66 struct PngReader::PngRabi
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67 {
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68 png_structp png_;
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69 png_infop info_;
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70 png_infop endInfo_;
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71
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72 void Destruct()
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73 {
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74 if (png_)
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75 {
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76 png_destroy_read_struct(&png_, &info_, &endInfo_);
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77
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78 png_ = NULL;
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79 info_ = NULL;
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80 endInfo_ = NULL;
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81 }
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82 }
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83
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84 PngRabi()
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85 {
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86 png_ = NULL;
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87 info_ = NULL;
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88 endInfo_ = NULL;
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89
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90 png_ = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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91 if (!png_)
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92 {
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93 throw OrthancException(ErrorCode_NotEnoughMemory);
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94 }
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95
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96 info_ = png_create_info_struct(png_);
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97 if (!info_)
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98 {
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99 png_destroy_read_struct(&png_, NULL, NULL);
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100 throw OrthancException(ErrorCode_NotEnoughMemory);
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101 }
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102
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103 endInfo_ = png_create_info_struct(png_);
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104 if (!info_)
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105 {
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106 png_destroy_read_struct(&png_, &info_, NULL);
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107 throw OrthancException(ErrorCode_NotEnoughMemory);
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108 }
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109 }
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110
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111 ~PngRabi()
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112 {
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113 Destruct();
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114 }
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115
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116 static void MemoryCallback(png_structp png_ptr,
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117 png_bytep data,
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118 png_size_t size);
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119 };
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120
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121
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122 void PngReader::CheckHeader(const void* header)
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123 {
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124 int is_png = !png_sig_cmp((png_bytep) header, 0, 8);
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125 if (!is_png)
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126 {
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127 throw OrthancException(ErrorCode_BadFileFormat);
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128 }
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129 }
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130
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131 PngReader::PngReader()
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132 {
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133 width_ = 0;
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134 height_ = 0;
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135 pitch_ = 0;
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136 format_ = PixelFormat_Grayscale8;
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137 }
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138
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139 void PngReader::Read(PngRabi& rabi)
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140 {
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141 png_set_sig_bytes(rabi.png_, 8);
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142
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143 png_read_info(rabi.png_, rabi.info_);
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144
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145 png_uint_32 width, height;
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146 int bit_depth, color_type, interlace_type;
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147 int compression_type, filter_method;
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148 // get size and bit-depth of the PNG-image
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149 png_get_IHDR(rabi.png_, rabi.info_,
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150 &width, &height,
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151 &bit_depth, &color_type, &interlace_type,
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152 &compression_type, &filter_method);
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153
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154 width_ = width;
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155 height_ = height;
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156
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157 if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 8)
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158 {
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159 format_ = PixelFormat_Grayscale8;
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160 pitch_ = width_;
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161 }
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162 else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 16)
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163 {
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164 format_ = PixelFormat_Grayscale16;
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165 pitch_ = 2 * width_;
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166
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167 if (Toolbox::DetectEndianness() == Endianness_Little)
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168 {
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169 png_set_swap(rabi.png_);
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170 }
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171 }
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172 else if (color_type == PNG_COLOR_TYPE_RGB && bit_depth == 8)
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173 {
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174 format_ = PixelFormat_Grayscale8;
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175 pitch_ = 3 * width_;
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176 }
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177 else
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178 {
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179 throw OrthancException(ErrorCode_NotImplemented);
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180 }
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181
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182 buffer_.resize(height_ * pitch_);
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183
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184 if (height_ == 0 || width_ == 0)
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185 {
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186 // Empty image, we are done
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187 return;
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188 }
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189
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190 png_read_update_info(rabi.png_, rabi.info_);
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191
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192 std::vector<png_bytep> rows(height_);
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193 for (size_t i = 0; i < height_; i++)
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194 {
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195 rows[i] = &buffer_[0] + i * pitch_;
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196 }
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197
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198 png_read_image(rabi.png_, &rows[0]);
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199 }
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200
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201 void PngReader::ReadFromFile(const char* filename)
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202 {
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203 FileRabi f(filename);
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204
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205 char header[8];
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206 if (fread(header, 1, 8, f.fp_) != 8)
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207 {
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208 throw OrthancException(ErrorCode_BadFileFormat);
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209 }
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210
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211 CheckHeader(header);
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212
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213 PngRabi rabi;
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214
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215 if (setjmp(png_jmpbuf(rabi.png_)))
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216 {
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217 rabi.Destruct();
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218 throw OrthancException(ErrorCode_BadFileFormat);
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219 }
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220
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221 png_init_io(rabi.png_, f.fp_);
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222
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223 Read(rabi);
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224 }
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225
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226
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227
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228 namespace
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229 {
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230 struct MemoryBuffer
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231 {
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232 const uint8_t* buffer_;
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233 size_t size_;
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234 size_t pos_;
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235 bool ok_;
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236 };
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237 }
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238
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239
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240 void PngReader::PngRabi::MemoryCallback(png_structp png_ptr,
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241 png_bytep outBytes,
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242 png_size_t byteCountToRead)
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243 {
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244 MemoryBuffer* from = (MemoryBuffer*) png_get_io_ptr(png_ptr);
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245
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246 if (!from->ok_)
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247 {
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248 return;
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249 }
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250
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251 if (from->pos_ + byteCountToRead > from->size_)
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252 {
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253 from->ok_ = false;
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254 return;
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255 }
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256
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257 memcpy(outBytes, from->buffer_ + from->pos_, byteCountToRead);
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258
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259 from->pos_ += byteCountToRead;
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260 }
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261
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262
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263 void PngReader::ReadFromMemory(const void* buffer,
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264 size_t size)
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265 {
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266 if (size < 8)
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267 {
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268 throw OrthancException(ErrorCode_BadFileFormat);
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269 }
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270
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271 CheckHeader(buffer);
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272
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273 PngRabi rabi;
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274
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275 if (setjmp(png_jmpbuf(rabi.png_)))
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276 {
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277 rabi.Destruct();
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278 throw OrthancException(ErrorCode_BadFileFormat);
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279 }
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280
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281 MemoryBuffer tmp;
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282 tmp.buffer_ = reinterpret_cast<const uint8_t*>(buffer) + 8; // We skip the header
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283 tmp.size_ = size - 8;
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284 tmp.pos_ = 0;
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285 tmp.ok_ = true;
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286
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287 png_set_read_fn(rabi.png_, &tmp, PngRabi::MemoryCallback);
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288
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289 Read(rabi);
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290
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291 if (!tmp.ok_)
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292 {
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293 throw OrthancException(ErrorCode_BadFileFormat);
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294 }
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295 }
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296
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297 void PngReader::ReadFromMemory(const std::string& buffer)
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298 {
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299 if (buffer.size() != 0)
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300 ReadFromMemory(&buffer[0], buffer.size());
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301 else
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302 ReadFromMemory(NULL, 0);
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303 }
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304 }
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