Mercurial > hg > orthanc
annotate Core/Images/PngReader.cpp @ 2171:35febe19e874
improved support for sandboxed environments
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Wed, 23 Nov 2016 11:46:42 +0100 |
| parents | baf8dd89b4e0 |
| children | a3a65de1840f |
| rev | line source |
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| 455 | 1 /** |
| 2 * Orthanc - A Lightweight, RESTful DICOM Store | |
| 1900 | 3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics |
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4 * Department, University Hospital of Liege, Belgium |
| 455 | 5 * |
| 6 * This program is free software: you can redistribute it and/or | |
| 7 * modify it under the terms of the GNU General Public License as | |
| 8 * published by the Free Software Foundation, either version 3 of the | |
| 9 * License, or (at your option) any later version. | |
| 10 * | |
| 11 * In addition, as a special exception, the copyright holders of this | |
| 12 * program give permission to link the code of its release with the | |
| 13 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
| 14 * that use the same license as the "OpenSSL" library), and distribute | |
| 15 * the linked executables. You must obey the GNU General Public License | |
| 16 * in all respects for all of the code used other than "OpenSSL". If you | |
| 17 * modify file(s) with this exception, you may extend this exception to | |
| 18 * your version of the file(s), but you are not obligated to do so. If | |
| 19 * you do not wish to do so, delete this exception statement from your | |
| 20 * version. If you delete this exception statement from all source files | |
| 21 * in the program, then also delete it here. | |
| 22 * | |
| 23 * This program is distributed in the hope that it will be useful, but | |
| 24 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 26 * General Public License for more details. | |
| 27 * | |
| 28 * You should have received a copy of the GNU General Public License | |
| 29 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 30 **/ | |
| 31 | |
| 32 | |
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33 #include "../PrecompiledHeaders.h" |
| 455 | 34 #include "PngReader.h" |
| 35 | |
| 36 #include "../OrthancException.h" | |
| 37 #include "../Toolbox.h" | |
| 38 | |
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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 |
| 455 | 43 #include <png.h> |
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44 #include <string.h> // For memcpy() |
| 455 | 45 |
| 46 namespace Orthanc | |
| 47 { | |
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48 #if ORTHANC_SANDBOXED == 0 |
| 455 | 49 namespace |
| 50 { | |
| 51 struct FileRabi | |
| 52 { | |
| 53 FILE* fp_; | |
| 54 | |
| 55 FileRabi(const char* filename) | |
| 56 { | |
| 2140 | 57 fp_ = SystemToolbox::OpenFile(filename, FileMode_ReadBinary); |
| 455 | 58 if (!fp_) |
| 59 { | |
| 60 throw OrthancException(ErrorCode_InexistentFile); | |
| 61 } | |
| 62 } | |
| 63 | |
| 64 ~FileRabi() | |
| 65 { | |
| 66 if (fp_) | |
| 2017 | 67 { |
| 455 | 68 fclose(fp_); |
| 2017 | 69 } |
| 455 | 70 } |
| 71 }; | |
| 72 } | |
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73 #endif |
| 455 | 74 |
| 75 | |
| 76 struct PngReader::PngRabi | |
| 77 { | |
| 78 png_structp png_; | |
| 79 png_infop info_; | |
| 80 png_infop endInfo_; | |
| 81 | |
| 82 void Destruct() | |
| 83 { | |
| 84 if (png_) | |
| 85 { | |
| 86 png_destroy_read_struct(&png_, &info_, &endInfo_); | |
| 87 | |
| 88 png_ = NULL; | |
| 89 info_ = NULL; | |
| 90 endInfo_ = NULL; | |
| 91 } | |
| 92 } | |
| 93 | |
| 94 PngRabi() | |
| 95 { | |
| 96 png_ = NULL; | |
| 97 info_ = NULL; | |
| 98 endInfo_ = NULL; | |
| 99 | |
| 100 png_ = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); | |
| 101 if (!png_) | |
| 102 { | |
| 103 throw OrthancException(ErrorCode_NotEnoughMemory); | |
| 104 } | |
| 105 | |
| 106 info_ = png_create_info_struct(png_); | |
| 107 if (!info_) | |
| 108 { | |
| 109 png_destroy_read_struct(&png_, NULL, NULL); | |
| 110 throw OrthancException(ErrorCode_NotEnoughMemory); | |
| 111 } | |
| 112 | |
| 113 endInfo_ = png_create_info_struct(png_); | |
| 114 if (!info_) | |
| 115 { | |
| 116 png_destroy_read_struct(&png_, &info_, NULL); | |
| 117 throw OrthancException(ErrorCode_NotEnoughMemory); | |
| 118 } | |
| 119 } | |
| 120 | |
| 121 ~PngRabi() | |
| 122 { | |
| 123 Destruct(); | |
| 124 } | |
| 125 | |
| 126 static void MemoryCallback(png_structp png_ptr, | |
| 127 png_bytep data, | |
| 128 png_size_t size); | |
| 129 }; | |
| 130 | |
| 131 | |
| 132 void PngReader::CheckHeader(const void* header) | |
| 133 { | |
| 134 int is_png = !png_sig_cmp((png_bytep) header, 0, 8); | |
| 135 if (!is_png) | |
| 136 { | |
| 137 throw OrthancException(ErrorCode_BadFileFormat); | |
| 138 } | |
| 139 } | |
| 140 | |
| 141 PngReader::PngReader() | |
| 142 { | |
| 143 } | |
| 144 | |
| 145 void PngReader::Read(PngRabi& rabi) | |
| 146 { | |
| 147 png_set_sig_bytes(rabi.png_, 8); | |
| 148 | |
| 149 png_read_info(rabi.png_, rabi.info_); | |
| 150 | |
| 151 png_uint_32 width, height; | |
| 152 int bit_depth, color_type, interlace_type; | |
| 153 int compression_type, filter_method; | |
| 154 // get size and bit-depth of the PNG-image | |
| 155 png_get_IHDR(rabi.png_, rabi.info_, | |
| 156 &width, &height, | |
| 157 &bit_depth, &color_type, &interlace_type, | |
| 158 &compression_type, &filter_method); | |
| 159 | |
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160 PixelFormat format; |
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161 unsigned int pitch; |
| 455 | 162 |
| 163 if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 8) | |
| 164 { | |
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165 format = PixelFormat_Grayscale8; |
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166 pitch = width; |
| 455 | 167 } |
| 168 else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 16) | |
| 169 { | |
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170 format = PixelFormat_Grayscale16; |
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171 pitch = 2 * width; |
| 455 | 172 |
| 173 if (Toolbox::DetectEndianness() == Endianness_Little) | |
| 174 { | |
| 175 png_set_swap(rabi.png_); | |
| 176 } | |
| 177 } | |
| 178 else if (color_type == PNG_COLOR_TYPE_RGB && bit_depth == 8) | |
| 179 { | |
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180 format = PixelFormat_RGB24; |
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181 pitch = 3 * width; |
| 455 | 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 } |
| 455 | 188 else |
| 189 { | |
| 190 throw OrthancException(ErrorCode_NotImplemented); | |
| 191 } | |
| 192 | |
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193 data_.resize(height * pitch); |
| 455 | 194 |
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195 if (height == 0 || width == 0) |
| 455 | 196 { |
| 197 // Empty image, we are done | |
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198 AssignEmpty(format); |
| 455 | 199 return; |
| 200 } | |
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201 |
| 455 | 202 png_read_update_info(rabi.png_, rabi.info_); |
| 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++) |
| 455 | 206 { |
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207 rows[i] = &data_[0] + i * pitch; |
| 455 | 208 } |
| 209 | |
| 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]); |
| 455 | 213 } |
| 214 | |
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215 |
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216 #if ORTHANC_SANDBOXED == 0 |
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217 void PngReader::ReadFromFile(const std::string& filename) |
| 455 | 218 { |
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219 FileRabi f(filename.c_str()); |
| 455 | 220 |
| 221 char header[8]; | |
| 222 if (fread(header, 1, 8, f.fp_) != 8) | |
| 223 { | |
| 224 throw OrthancException(ErrorCode_BadFileFormat); | |
| 225 } | |
| 226 | |
| 227 CheckHeader(header); | |
| 228 | |
| 229 PngRabi rabi; | |
| 230 | |
| 231 if (setjmp(png_jmpbuf(rabi.png_))) | |
| 232 { | |
| 233 rabi.Destruct(); | |
| 234 throw OrthancException(ErrorCode_BadFileFormat); | |
| 235 } | |
| 236 | |
| 237 png_init_io(rabi.png_, f.fp_); | |
| 238 | |
| 239 Read(rabi); | |
| 240 } | |
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241 #endif |
| 455 | 242 |
| 243 | |
| 244 namespace | |
| 245 { | |
| 246 struct MemoryBuffer | |
| 247 { | |
| 248 const uint8_t* buffer_; | |
| 249 size_t size_; | |
| 250 size_t pos_; | |
| 251 bool ok_; | |
| 252 }; | |
| 253 } | |
| 254 | |
| 255 | |
| 256 void PngReader::PngRabi::MemoryCallback(png_structp png_ptr, | |
| 257 png_bytep outBytes, | |
| 258 png_size_t byteCountToRead) | |
| 259 { | |
| 656 | 260 MemoryBuffer* from = reinterpret_cast<MemoryBuffer*>(png_get_io_ptr(png_ptr)); |
| 455 | 261 |
| 262 if (!from->ok_) | |
| 263 { | |
| 264 return; | |
| 265 } | |
| 266 | |
| 267 if (from->pos_ + byteCountToRead > from->size_) | |
| 268 { | |
| 269 from->ok_ = false; | |
| 270 return; | |
| 271 } | |
| 272 | |
| 273 memcpy(outBytes, from->buffer_ + from->pos_, byteCountToRead); | |
| 274 | |
| 275 from->pos_ += byteCountToRead; | |
| 276 } | |
| 277 | |
| 278 | |
| 279 void PngReader::ReadFromMemory(const void* buffer, | |
| 280 size_t size) | |
| 281 { | |
| 282 if (size < 8) | |
| 283 { | |
| 284 throw OrthancException(ErrorCode_BadFileFormat); | |
| 285 } | |
| 286 | |
| 287 CheckHeader(buffer); | |
| 288 | |
| 289 PngRabi rabi; | |
| 290 | |
| 291 if (setjmp(png_jmpbuf(rabi.png_))) | |
| 292 { | |
| 293 rabi.Destruct(); | |
| 294 throw OrthancException(ErrorCode_BadFileFormat); | |
| 295 } | |
| 296 | |
| 297 MemoryBuffer tmp; | |
| 298 tmp.buffer_ = reinterpret_cast<const uint8_t*>(buffer) + 8; // We skip the header | |
| 299 tmp.size_ = size - 8; | |
| 300 tmp.pos_ = 0; | |
| 301 tmp.ok_ = true; | |
| 302 | |
| 303 png_set_read_fn(rabi.png_, &tmp, PngRabi::MemoryCallback); | |
| 304 | |
| 305 Read(rabi); | |
| 306 | |
| 307 if (!tmp.ok_) | |
| 308 { | |
| 309 throw OrthancException(ErrorCode_BadFileFormat); | |
| 310 } | |
| 311 } | |
| 312 | |
| 313 void PngReader::ReadFromMemory(const std::string& buffer) | |
| 314 { | |
| 315 if (buffer.size() != 0) | |
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316 { |
| 455 | 317 ReadFromMemory(&buffer[0], buffer.size()); |
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318 } |
| 455 | 319 else |
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320 { |
| 455 | 321 ReadFromMemory(NULL, 0); |
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322 } |
| 455 | 323 } |
| 324 } |