Mercurial > hg > orthanc
annotate Core/ImageFormats/PngReader.cpp @ 1127:f4e65808ea58
FilesystemStorageWithoutDicom
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Fri, 05 Sep 2014 17:12:08 +0200 |
parents | a811bdf8b8eb |
children | 6e7e5ed91c2d |
rev | line source |
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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 } |