Mercurial > hg > orthanc
annotate Core/ImageFormats/PngReader.cpp @ 949:766a57997121
enumeration for encodings
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Wed, 25 Jun 2014 15:02:37 +0200 |
| parents | a811bdf8b8eb |
| children | 6e7e5ed91c2d |
| 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 | |
|
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33 #include "../PrecompiledHeaders.h" |
| 455 | 34 #include "PngReader.h" |
| 35 | |
| 36 #include "../OrthancException.h" | |
| 37 #include "../Toolbox.h" | |
| 38 | |
| 39 #include <png.h> | |
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40 #include <string.h> // For memcpy() |
| 455 | 41 |
| 42 namespace Orthanc | |
| 43 { | |
| 44 namespace | |
| 45 { | |
| 46 struct FileRabi | |
| 47 { | |
| 48 FILE* fp_; | |
| 49 | |
| 50 FileRabi(const char* filename) | |
| 51 { | |
| 52 fp_ = fopen(filename, "rb"); | |
| 53 if (!fp_) | |
| 54 { | |
| 55 throw OrthancException(ErrorCode_InexistentFile); | |
| 56 } | |
| 57 } | |
| 58 | |
| 59 ~FileRabi() | |
| 60 { | |
| 61 if (fp_) | |
| 62 fclose(fp_); | |
| 63 } | |
| 64 }; | |
| 65 } | |
| 66 | |
| 67 | |
| 68 struct PngReader::PngRabi | |
| 69 { | |
| 70 png_structp png_; | |
| 71 png_infop info_; | |
| 72 png_infop endInfo_; | |
| 73 | |
| 74 void Destruct() | |
| 75 { | |
| 76 if (png_) | |
| 77 { | |
| 78 png_destroy_read_struct(&png_, &info_, &endInfo_); | |
| 79 | |
| 80 png_ = NULL; | |
| 81 info_ = NULL; | |
| 82 endInfo_ = NULL; | |
| 83 } | |
| 84 } | |
| 85 | |
| 86 PngRabi() | |
| 87 { | |
| 88 png_ = NULL; | |
| 89 info_ = NULL; | |
| 90 endInfo_ = NULL; | |
| 91 | |
| 92 png_ = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); | |
| 93 if (!png_) | |
| 94 { | |
| 95 throw OrthancException(ErrorCode_NotEnoughMemory); | |
| 96 } | |
| 97 | |
| 98 info_ = png_create_info_struct(png_); | |
| 99 if (!info_) | |
| 100 { | |
| 101 png_destroy_read_struct(&png_, NULL, NULL); | |
| 102 throw OrthancException(ErrorCode_NotEnoughMemory); | |
| 103 } | |
| 104 | |
| 105 endInfo_ = png_create_info_struct(png_); | |
| 106 if (!info_) | |
| 107 { | |
| 108 png_destroy_read_struct(&png_, &info_, NULL); | |
| 109 throw OrthancException(ErrorCode_NotEnoughMemory); | |
| 110 } | |
| 111 } | |
| 112 | |
| 113 ~PngRabi() | |
| 114 { | |
| 115 Destruct(); | |
| 116 } | |
| 117 | |
| 118 static void MemoryCallback(png_structp png_ptr, | |
| 119 png_bytep data, | |
| 120 png_size_t size); | |
| 121 }; | |
| 122 | |
| 123 | |
| 124 void PngReader::CheckHeader(const void* header) | |
| 125 { | |
| 126 int is_png = !png_sig_cmp((png_bytep) header, 0, 8); | |
| 127 if (!is_png) | |
| 128 { | |
| 129 throw OrthancException(ErrorCode_BadFileFormat); | |
| 130 } | |
| 131 } | |
| 132 | |
| 133 PngReader::PngReader() | |
| 134 { | |
| 135 } | |
| 136 | |
| 137 void PngReader::Read(PngRabi& rabi) | |
| 138 { | |
| 139 png_set_sig_bytes(rabi.png_, 8); | |
| 140 | |
| 141 png_read_info(rabi.png_, rabi.info_); | |
| 142 | |
| 143 png_uint_32 width, height; | |
| 144 int bit_depth, color_type, interlace_type; | |
| 145 int compression_type, filter_method; | |
| 146 // get size and bit-depth of the PNG-image | |
| 147 png_get_IHDR(rabi.png_, rabi.info_, | |
| 148 &width, &height, | |
| 149 &bit_depth, &color_type, &interlace_type, | |
| 150 &compression_type, &filter_method); | |
| 151 | |
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152 PixelFormat format; |
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153 unsigned int pitch; |
| 455 | 154 |
| 155 if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 8) | |
| 156 { | |
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157 format = PixelFormat_Grayscale8; |
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158 pitch = width; |
| 455 | 159 } |
| 160 else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 16) | |
| 161 { | |
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162 format = PixelFormat_Grayscale16; |
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163 pitch = 2 * width; |
| 455 | 164 |
| 165 if (Toolbox::DetectEndianness() == Endianness_Little) | |
| 166 { | |
| 167 png_set_swap(rabi.png_); | |
| 168 } | |
| 169 } | |
| 170 else if (color_type == PNG_COLOR_TYPE_RGB && bit_depth == 8) | |
| 171 { | |
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172 format = PixelFormat_RGB24; |
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173 pitch = 3 * width; |
| 455 | 174 } |
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175 else if (color_type == PNG_COLOR_TYPE_RGBA && bit_depth == 8) |
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176 { |
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177 format = PixelFormat_RGBA32; |
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178 pitch = 4 * width; |
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179 } |
| 455 | 180 else |
| 181 { | |
| 182 throw OrthancException(ErrorCode_NotImplemented); | |
| 183 } | |
| 184 | |
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185 data_.resize(height * pitch); |
| 455 | 186 |
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187 if (height == 0 || width == 0) |
| 455 | 188 { |
| 189 // Empty image, we are done | |
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190 AssignEmpty(format); |
| 455 | 191 return; |
| 192 } | |
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193 |
| 455 | 194 png_read_update_info(rabi.png_, rabi.info_); |
| 195 | |
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196 std::vector<png_bytep> rows(height); |
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197 for (size_t i = 0; i < height; i++) |
| 455 | 198 { |
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199 rows[i] = &data_[0] + i * pitch; |
| 455 | 200 } |
| 201 | |
| 202 png_read_image(rabi.png_, &rows[0]); | |
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203 |
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204 AssignReadOnly(format, width, height, pitch, &data_[0]); |
| 455 | 205 } |
| 206 | |
| 207 void PngReader::ReadFromFile(const char* filename) | |
| 208 { | |
| 209 FileRabi f(filename); | |
| 210 | |
| 211 char header[8]; | |
| 212 if (fread(header, 1, 8, f.fp_) != 8) | |
| 213 { | |
| 214 throw OrthancException(ErrorCode_BadFileFormat); | |
| 215 } | |
| 216 | |
| 217 CheckHeader(header); | |
| 218 | |
| 219 PngRabi rabi; | |
| 220 | |
| 221 if (setjmp(png_jmpbuf(rabi.png_))) | |
| 222 { | |
| 223 rabi.Destruct(); | |
| 224 throw OrthancException(ErrorCode_BadFileFormat); | |
| 225 } | |
| 226 | |
| 227 png_init_io(rabi.png_, f.fp_); | |
| 228 | |
| 229 Read(rabi); | |
| 230 } | |
| 231 | |
| 232 | |
| 233 namespace | |
| 234 { | |
| 235 struct MemoryBuffer | |
| 236 { | |
| 237 const uint8_t* buffer_; | |
| 238 size_t size_; | |
| 239 size_t pos_; | |
| 240 bool ok_; | |
| 241 }; | |
| 242 } | |
| 243 | |
| 244 | |
| 245 void PngReader::PngRabi::MemoryCallback(png_structp png_ptr, | |
| 246 png_bytep outBytes, | |
| 247 png_size_t byteCountToRead) | |
| 248 { | |
| 656 | 249 MemoryBuffer* from = reinterpret_cast<MemoryBuffer*>(png_get_io_ptr(png_ptr)); |
| 455 | 250 |
| 251 if (!from->ok_) | |
| 252 { | |
| 253 return; | |
| 254 } | |
| 255 | |
| 256 if (from->pos_ + byteCountToRead > from->size_) | |
| 257 { | |
| 258 from->ok_ = false; | |
| 259 return; | |
| 260 } | |
| 261 | |
| 262 memcpy(outBytes, from->buffer_ + from->pos_, byteCountToRead); | |
| 263 | |
| 264 from->pos_ += byteCountToRead; | |
| 265 } | |
| 266 | |
| 267 | |
| 268 void PngReader::ReadFromMemory(const void* buffer, | |
| 269 size_t size) | |
| 270 { | |
| 271 if (size < 8) | |
| 272 { | |
| 273 throw OrthancException(ErrorCode_BadFileFormat); | |
| 274 } | |
| 275 | |
| 276 CheckHeader(buffer); | |
| 277 | |
| 278 PngRabi rabi; | |
| 279 | |
| 280 if (setjmp(png_jmpbuf(rabi.png_))) | |
| 281 { | |
| 282 rabi.Destruct(); | |
| 283 throw OrthancException(ErrorCode_BadFileFormat); | |
| 284 } | |
| 285 | |
| 286 MemoryBuffer tmp; | |
| 287 tmp.buffer_ = reinterpret_cast<const uint8_t*>(buffer) + 8; // We skip the header | |
| 288 tmp.size_ = size - 8; | |
| 289 tmp.pos_ = 0; | |
| 290 tmp.ok_ = true; | |
| 291 | |
| 292 png_set_read_fn(rabi.png_, &tmp, PngRabi::MemoryCallback); | |
| 293 | |
| 294 Read(rabi); | |
| 295 | |
| 296 if (!tmp.ok_) | |
| 297 { | |
| 298 throw OrthancException(ErrorCode_BadFileFormat); | |
| 299 } | |
| 300 } | |
| 301 | |
| 302 void PngReader::ReadFromMemory(const std::string& buffer) | |
| 303 { | |
| 304 if (buffer.size() != 0) | |
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305 { |
| 455 | 306 ReadFromMemory(&buffer[0], buffer.size()); |
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307 } |
| 455 | 308 else |
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309 { |
| 455 | 310 ReadFromMemory(NULL, 0); |
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311 } |
| 455 | 312 } |
| 313 } |