Mercurial > hg > orthanc
annotate Core/ImageFormats/PngReader.cpp @ 799:777b6b694da6
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Tue, 06 May 2014 12:55:41 +0200 |
| parents | Core/FileFormats/PngReader.cpp@e1d27ee2114a |
| children | ecedd89055db |
| rev | line source |
|---|---|
| 455 | 1 /** |
| 2 * Orthanc - A Lightweight, RESTful DICOM Store | |
| 689 | 3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege, |
| 455 | 4 * Belgium |
| 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 | |
| 33 #include "PngReader.h" | |
| 34 | |
| 35 #include "../OrthancException.h" | |
| 36 #include "../Toolbox.h" | |
| 37 | |
| 38 #include <png.h> | |
|
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39 #include <string.h> // For memcpy() |
| 455 | 40 |
| 41 namespace Orthanc | |
| 42 { | |
| 43 namespace | |
| 44 { | |
| 45 struct FileRabi | |
| 46 { | |
| 47 FILE* fp_; | |
| 48 | |
| 49 FileRabi(const char* filename) | |
| 50 { | |
| 51 fp_ = fopen(filename, "rb"); | |
| 52 if (!fp_) | |
| 53 { | |
| 54 throw OrthancException(ErrorCode_InexistentFile); | |
| 55 } | |
| 56 } | |
| 57 | |
| 58 ~FileRabi() | |
| 59 { | |
| 60 if (fp_) | |
| 61 fclose(fp_); | |
| 62 } | |
| 63 }; | |
| 64 } | |
| 65 | |
| 66 | |
| 67 struct PngReader::PngRabi | |
| 68 { | |
| 69 png_structp png_; | |
| 70 png_infop info_; | |
| 71 png_infop endInfo_; | |
| 72 | |
| 73 void Destruct() | |
| 74 { | |
| 75 if (png_) | |
| 76 { | |
| 77 png_destroy_read_struct(&png_, &info_, &endInfo_); | |
| 78 | |
| 79 png_ = NULL; | |
| 80 info_ = NULL; | |
| 81 endInfo_ = NULL; | |
| 82 } | |
| 83 } | |
| 84 | |
| 85 PngRabi() | |
| 86 { | |
| 87 png_ = NULL; | |
| 88 info_ = NULL; | |
| 89 endInfo_ = NULL; | |
| 90 | |
| 91 png_ = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); | |
| 92 if (!png_) | |
| 93 { | |
| 94 throw OrthancException(ErrorCode_NotEnoughMemory); | |
| 95 } | |
| 96 | |
| 97 info_ = png_create_info_struct(png_); | |
| 98 if (!info_) | |
| 99 { | |
| 100 png_destroy_read_struct(&png_, NULL, NULL); | |
| 101 throw OrthancException(ErrorCode_NotEnoughMemory); | |
| 102 } | |
| 103 | |
| 104 endInfo_ = png_create_info_struct(png_); | |
| 105 if (!info_) | |
| 106 { | |
| 107 png_destroy_read_struct(&png_, &info_, NULL); | |
| 108 throw OrthancException(ErrorCode_NotEnoughMemory); | |
| 109 } | |
| 110 } | |
| 111 | |
| 112 ~PngRabi() | |
| 113 { | |
| 114 Destruct(); | |
| 115 } | |
| 116 | |
| 117 static void MemoryCallback(png_structp png_ptr, | |
| 118 png_bytep data, | |
| 119 png_size_t size); | |
| 120 }; | |
| 121 | |
| 122 | |
| 123 void PngReader::CheckHeader(const void* header) | |
| 124 { | |
| 125 int is_png = !png_sig_cmp((png_bytep) header, 0, 8); | |
| 126 if (!is_png) | |
| 127 { | |
| 128 throw OrthancException(ErrorCode_BadFileFormat); | |
| 129 } | |
| 130 } | |
| 131 | |
| 132 PngReader::PngReader() | |
| 133 { | |
| 134 } | |
| 135 | |
| 136 void PngReader::Read(PngRabi& rabi) | |
| 137 { | |
| 138 png_set_sig_bytes(rabi.png_, 8); | |
| 139 | |
| 140 png_read_info(rabi.png_, rabi.info_); | |
| 141 | |
| 142 png_uint_32 width, height; | |
| 143 int bit_depth, color_type, interlace_type; | |
| 144 int compression_type, filter_method; | |
| 145 // get size and bit-depth of the PNG-image | |
| 146 png_get_IHDR(rabi.png_, rabi.info_, | |
| 147 &width, &height, | |
| 148 &bit_depth, &color_type, &interlace_type, | |
| 149 &compression_type, &filter_method); | |
| 150 | |
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151 PixelFormat format; |
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152 unsigned int pitch; |
| 455 | 153 |
| 154 if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 8) | |
| 155 { | |
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156 format = PixelFormat_Grayscale8; |
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157 pitch = width; |
| 455 | 158 } |
| 159 else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 16) | |
| 160 { | |
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161 format = PixelFormat_Grayscale16; |
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162 pitch = 2 * width; |
| 455 | 163 |
| 164 if (Toolbox::DetectEndianness() == Endianness_Little) | |
| 165 { | |
| 166 png_set_swap(rabi.png_); | |
| 167 } | |
| 168 } | |
| 169 else if (color_type == PNG_COLOR_TYPE_RGB && bit_depth == 8) | |
| 170 { | |
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171 format = PixelFormat_RGB24; |
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172 pitch = 3 * width; |
| 455 | 173 } |
| 174 else | |
| 175 { | |
| 176 throw OrthancException(ErrorCode_NotImplemented); | |
| 177 } | |
| 178 | |
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179 data_.resize(height * pitch); |
| 455 | 180 |
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181 if (height == 0 || width == 0) |
| 455 | 182 { |
| 183 // Empty image, we are done | |
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184 AssignEmpty(format); |
| 455 | 185 return; |
| 186 } | |
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187 |
| 455 | 188 png_read_update_info(rabi.png_, rabi.info_); |
| 189 | |
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190 std::vector<png_bytep> rows(height); |
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191 for (size_t i = 0; i < height; i++) |
| 455 | 192 { |
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193 rows[i] = &data_[0] + i * pitch; |
| 455 | 194 } |
| 195 | |
| 196 png_read_image(rabi.png_, &rows[0]); | |
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197 |
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198 AssignReadOnly(format, width, height, pitch, &data_[0]); |
| 455 | 199 } |
| 200 | |
| 201 void PngReader::ReadFromFile(const char* filename) | |
| 202 { | |
| 203 FileRabi f(filename); | |
| 204 | |
| 205 char header[8]; | |
| 206 if (fread(header, 1, 8, f.fp_) != 8) | |
| 207 { | |
| 208 throw OrthancException(ErrorCode_BadFileFormat); | |
| 209 } | |
| 210 | |
| 211 CheckHeader(header); | |
| 212 | |
| 213 PngRabi rabi; | |
| 214 | |
| 215 if (setjmp(png_jmpbuf(rabi.png_))) | |
| 216 { | |
| 217 rabi.Destruct(); | |
| 218 throw OrthancException(ErrorCode_BadFileFormat); | |
| 219 } | |
| 220 | |
| 221 png_init_io(rabi.png_, f.fp_); | |
| 222 | |
| 223 Read(rabi); | |
| 224 } | |
| 225 | |
| 226 | |
| 227 namespace | |
| 228 { | |
| 229 struct MemoryBuffer | |
| 230 { | |
| 231 const uint8_t* buffer_; | |
| 232 size_t size_; | |
| 233 size_t pos_; | |
| 234 bool ok_; | |
| 235 }; | |
| 236 } | |
| 237 | |
| 238 | |
| 239 void PngReader::PngRabi::MemoryCallback(png_structp png_ptr, | |
| 240 png_bytep outBytes, | |
| 241 png_size_t byteCountToRead) | |
| 242 { | |
| 656 | 243 MemoryBuffer* from = reinterpret_cast<MemoryBuffer*>(png_get_io_ptr(png_ptr)); |
| 455 | 244 |
| 245 if (!from->ok_) | |
| 246 { | |
| 247 return; | |
| 248 } | |
| 249 | |
| 250 if (from->pos_ + byteCountToRead > from->size_) | |
| 251 { | |
| 252 from->ok_ = false; | |
| 253 return; | |
| 254 } | |
| 255 | |
| 256 memcpy(outBytes, from->buffer_ + from->pos_, byteCountToRead); | |
| 257 | |
| 258 from->pos_ += byteCountToRead; | |
| 259 } | |
| 260 | |
| 261 | |
| 262 void PngReader::ReadFromMemory(const void* buffer, | |
| 263 size_t size) | |
| 264 { | |
| 265 if (size < 8) | |
| 266 { | |
| 267 throw OrthancException(ErrorCode_BadFileFormat); | |
| 268 } | |
| 269 | |
| 270 CheckHeader(buffer); | |
| 271 | |
| 272 PngRabi rabi; | |
| 273 | |
| 274 if (setjmp(png_jmpbuf(rabi.png_))) | |
| 275 { | |
| 276 rabi.Destruct(); | |
| 277 throw OrthancException(ErrorCode_BadFileFormat); | |
| 278 } | |
| 279 | |
| 280 MemoryBuffer tmp; | |
| 281 tmp.buffer_ = reinterpret_cast<const uint8_t*>(buffer) + 8; // We skip the header | |
| 282 tmp.size_ = size - 8; | |
| 283 tmp.pos_ = 0; | |
| 284 tmp.ok_ = true; | |
| 285 | |
| 286 png_set_read_fn(rabi.png_, &tmp, PngRabi::MemoryCallback); | |
| 287 | |
| 288 Read(rabi); | |
| 289 | |
| 290 if (!tmp.ok_) | |
| 291 { | |
| 292 throw OrthancException(ErrorCode_BadFileFormat); | |
| 293 } | |
| 294 } | |
| 295 | |
| 296 void PngReader::ReadFromMemory(const std::string& buffer) | |
| 297 { | |
| 298 if (buffer.size() != 0) | |
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299 { |
| 455 | 300 ReadFromMemory(&buffer[0], buffer.size()); |
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301 } |
| 455 | 302 else |
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303 { |
| 455 | 304 ReadFromMemory(NULL, 0); |
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305 } |
| 455 | 306 } |
| 307 } |