Mercurial > hg > orthanc
annotate Core/Images/PngReader.cpp @ 2144:a979ded1dbb1
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 09 Nov 2016 16:57:19 +0100 |
parents | fd5875662670 |
children | baf8dd89b4e0 |
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" | |
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37 #include "../SystemToolbox.h" |
455 | 38 #include "../Toolbox.h" |
39 | |
40 #include <png.h> | |
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41 #include <string.h> // For memcpy() |
455 | 42 |
43 namespace Orthanc | |
44 { | |
45 namespace | |
46 { | |
47 struct FileRabi | |
48 { | |
49 FILE* fp_; | |
50 | |
51 FileRabi(const char* filename) | |
52 { | |
2140 | 53 fp_ = SystemToolbox::OpenFile(filename, FileMode_ReadBinary); |
455 | 54 if (!fp_) |
55 { | |
56 throw OrthancException(ErrorCode_InexistentFile); | |
57 } | |
58 } | |
59 | |
60 ~FileRabi() | |
61 { | |
62 if (fp_) | |
2017 | 63 { |
455 | 64 fclose(fp_); |
2017 | 65 } |
455 | 66 } |
67 }; | |
68 } | |
69 | |
70 | |
71 struct PngReader::PngRabi | |
72 { | |
73 png_structp png_; | |
74 png_infop info_; | |
75 png_infop endInfo_; | |
76 | |
77 void Destruct() | |
78 { | |
79 if (png_) | |
80 { | |
81 png_destroy_read_struct(&png_, &info_, &endInfo_); | |
82 | |
83 png_ = NULL; | |
84 info_ = NULL; | |
85 endInfo_ = NULL; | |
86 } | |
87 } | |
88 | |
89 PngRabi() | |
90 { | |
91 png_ = NULL; | |
92 info_ = NULL; | |
93 endInfo_ = NULL; | |
94 | |
95 png_ = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); | |
96 if (!png_) | |
97 { | |
98 throw OrthancException(ErrorCode_NotEnoughMemory); | |
99 } | |
100 | |
101 info_ = png_create_info_struct(png_); | |
102 if (!info_) | |
103 { | |
104 png_destroy_read_struct(&png_, NULL, NULL); | |
105 throw OrthancException(ErrorCode_NotEnoughMemory); | |
106 } | |
107 | |
108 endInfo_ = png_create_info_struct(png_); | |
109 if (!info_) | |
110 { | |
111 png_destroy_read_struct(&png_, &info_, NULL); | |
112 throw OrthancException(ErrorCode_NotEnoughMemory); | |
113 } | |
114 } | |
115 | |
116 ~PngRabi() | |
117 { | |
118 Destruct(); | |
119 } | |
120 | |
121 static void MemoryCallback(png_structp png_ptr, | |
122 png_bytep data, | |
123 png_size_t size); | |
124 }; | |
125 | |
126 | |
127 void PngReader::CheckHeader(const void* header) | |
128 { | |
129 int is_png = !png_sig_cmp((png_bytep) header, 0, 8); | |
130 if (!is_png) | |
131 { | |
132 throw OrthancException(ErrorCode_BadFileFormat); | |
133 } | |
134 } | |
135 | |
136 PngReader::PngReader() | |
137 { | |
138 } | |
139 | |
140 void PngReader::Read(PngRabi& rabi) | |
141 { | |
142 png_set_sig_bytes(rabi.png_, 8); | |
143 | |
144 png_read_info(rabi.png_, rabi.info_); | |
145 | |
146 png_uint_32 width, height; | |
147 int bit_depth, color_type, interlace_type; | |
148 int compression_type, filter_method; | |
149 // get size and bit-depth of the PNG-image | |
150 png_get_IHDR(rabi.png_, rabi.info_, | |
151 &width, &height, | |
152 &bit_depth, &color_type, &interlace_type, | |
153 &compression_type, &filter_method); | |
154 | |
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155 PixelFormat format; |
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156 unsigned int pitch; |
455 | 157 |
158 if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 8) | |
159 { | |
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160 format = PixelFormat_Grayscale8; |
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161 pitch = width; |
455 | 162 } |
163 else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 16) | |
164 { | |
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165 format = PixelFormat_Grayscale16; |
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166 pitch = 2 * width; |
455 | 167 |
168 if (Toolbox::DetectEndianness() == Endianness_Little) | |
169 { | |
170 png_set_swap(rabi.png_); | |
171 } | |
172 } | |
173 else if (color_type == PNG_COLOR_TYPE_RGB && bit_depth == 8) | |
174 { | |
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175 format = PixelFormat_RGB24; |
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176 pitch = 3 * width; |
455 | 177 } |
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178 else if (color_type == PNG_COLOR_TYPE_RGBA && bit_depth == 8) |
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179 { |
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180 format = PixelFormat_RGBA32; |
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181 pitch = 4 * width; |
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182 } |
455 | 183 else |
184 { | |
185 throw OrthancException(ErrorCode_NotImplemented); | |
186 } | |
187 | |
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188 data_.resize(height * pitch); |
455 | 189 |
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190 if (height == 0 || width == 0) |
455 | 191 { |
192 // Empty image, we are done | |
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193 AssignEmpty(format); |
455 | 194 return; |
195 } | |
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196 |
455 | 197 png_read_update_info(rabi.png_, rabi.info_); |
198 | |
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199 std::vector<png_bytep> rows(height); |
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200 for (size_t i = 0; i < height; i++) |
455 | 201 { |
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202 rows[i] = &data_[0] + i * pitch; |
455 | 203 } |
204 | |
205 png_read_image(rabi.png_, &rows[0]); | |
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206 |
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207 AssignWritable(format, width, height, pitch, &data_[0]); |
455 | 208 } |
209 | |
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210 void PngReader::ReadFromFile(const std::string& filename) |
455 | 211 { |
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212 FileRabi f(filename.c_str()); |
455 | 213 |
214 char header[8]; | |
215 if (fread(header, 1, 8, f.fp_) != 8) | |
216 { | |
217 throw OrthancException(ErrorCode_BadFileFormat); | |
218 } | |
219 | |
220 CheckHeader(header); | |
221 | |
222 PngRabi rabi; | |
223 | |
224 if (setjmp(png_jmpbuf(rabi.png_))) | |
225 { | |
226 rabi.Destruct(); | |
227 throw OrthancException(ErrorCode_BadFileFormat); | |
228 } | |
229 | |
230 png_init_io(rabi.png_, f.fp_); | |
231 | |
232 Read(rabi); | |
233 } | |
234 | |
235 | |
236 namespace | |
237 { | |
238 struct MemoryBuffer | |
239 { | |
240 const uint8_t* buffer_; | |
241 size_t size_; | |
242 size_t pos_; | |
243 bool ok_; | |
244 }; | |
245 } | |
246 | |
247 | |
248 void PngReader::PngRabi::MemoryCallback(png_structp png_ptr, | |
249 png_bytep outBytes, | |
250 png_size_t byteCountToRead) | |
251 { | |
656 | 252 MemoryBuffer* from = reinterpret_cast<MemoryBuffer*>(png_get_io_ptr(png_ptr)); |
455 | 253 |
254 if (!from->ok_) | |
255 { | |
256 return; | |
257 } | |
258 | |
259 if (from->pos_ + byteCountToRead > from->size_) | |
260 { | |
261 from->ok_ = false; | |
262 return; | |
263 } | |
264 | |
265 memcpy(outBytes, from->buffer_ + from->pos_, byteCountToRead); | |
266 | |
267 from->pos_ += byteCountToRead; | |
268 } | |
269 | |
270 | |
271 void PngReader::ReadFromMemory(const void* buffer, | |
272 size_t size) | |
273 { | |
274 if (size < 8) | |
275 { | |
276 throw OrthancException(ErrorCode_BadFileFormat); | |
277 } | |
278 | |
279 CheckHeader(buffer); | |
280 | |
281 PngRabi rabi; | |
282 | |
283 if (setjmp(png_jmpbuf(rabi.png_))) | |
284 { | |
285 rabi.Destruct(); | |
286 throw OrthancException(ErrorCode_BadFileFormat); | |
287 } | |
288 | |
289 MemoryBuffer tmp; | |
290 tmp.buffer_ = reinterpret_cast<const uint8_t*>(buffer) + 8; // We skip the header | |
291 tmp.size_ = size - 8; | |
292 tmp.pos_ = 0; | |
293 tmp.ok_ = true; | |
294 | |
295 png_set_read_fn(rabi.png_, &tmp, PngRabi::MemoryCallback); | |
296 | |
297 Read(rabi); | |
298 | |
299 if (!tmp.ok_) | |
300 { | |
301 throw OrthancException(ErrorCode_BadFileFormat); | |
302 } | |
303 } | |
304 | |
305 void PngReader::ReadFromMemory(const std::string& buffer) | |
306 { | |
307 if (buffer.size() != 0) | |
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308 { |
455 | 309 ReadFromMemory(&buffer[0], buffer.size()); |
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310 } |
455 | 311 else |
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312 { |
455 | 313 ReadFromMemory(NULL, 0); |
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314 } |
455 | 315 } |
316 } |