Mercurial > hg > orthanc
comparison Core/FileFormats/PngReader.cpp @ 455:238a0c99ced2
PNG reader
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Thu, 04 Jul 2013 15:25:15 +0200 |
parents | |
children | f3d4193c571a |
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454:6f47a4262618 | 455:238a0c99ced2 |
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1 /** | |
2 * Orthanc - A Lightweight, RESTful DICOM Store | |
3 * Copyright (C) 2012-2013 Medical Physics Department, CHU of Liege, | |
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> | |
39 | |
40 namespace Orthanc | |
41 { | |
42 namespace | |
43 { | |
44 struct FileRabi | |
45 { | |
46 FILE* fp_; | |
47 | |
48 FileRabi(const char* filename) | |
49 { | |
50 fp_ = fopen(filename, "rb"); | |
51 if (!fp_) | |
52 { | |
53 throw OrthancException(ErrorCode_InexistentFile); | |
54 } | |
55 } | |
56 | |
57 ~FileRabi() | |
58 { | |
59 if (fp_) | |
60 fclose(fp_); | |
61 } | |
62 }; | |
63 } | |
64 | |
65 | |
66 struct PngReader::PngRabi | |
67 { | |
68 png_structp png_; | |
69 png_infop info_; | |
70 png_infop endInfo_; | |
71 | |
72 void Destruct() | |
73 { | |
74 if (png_) | |
75 { | |
76 png_destroy_read_struct(&png_, &info_, &endInfo_); | |
77 | |
78 png_ = NULL; | |
79 info_ = NULL; | |
80 endInfo_ = NULL; | |
81 } | |
82 } | |
83 | |
84 PngRabi() | |
85 { | |
86 png_ = NULL; | |
87 info_ = NULL; | |
88 endInfo_ = NULL; | |
89 | |
90 png_ = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); | |
91 if (!png_) | |
92 { | |
93 throw OrthancException(ErrorCode_NotEnoughMemory); | |
94 } | |
95 | |
96 info_ = png_create_info_struct(png_); | |
97 if (!info_) | |
98 { | |
99 png_destroy_read_struct(&png_, NULL, NULL); | |
100 throw OrthancException(ErrorCode_NotEnoughMemory); | |
101 } | |
102 | |
103 endInfo_ = png_create_info_struct(png_); | |
104 if (!info_) | |
105 { | |
106 png_destroy_read_struct(&png_, &info_, NULL); | |
107 throw OrthancException(ErrorCode_NotEnoughMemory); | |
108 } | |
109 } | |
110 | |
111 ~PngRabi() | |
112 { | |
113 Destruct(); | |
114 } | |
115 | |
116 static void MemoryCallback(png_structp png_ptr, | |
117 png_bytep data, | |
118 png_size_t size); | |
119 }; | |
120 | |
121 | |
122 void PngReader::CheckHeader(const void* header) | |
123 { | |
124 int is_png = !png_sig_cmp((png_bytep) header, 0, 8); | |
125 if (!is_png) | |
126 { | |
127 throw OrthancException(ErrorCode_BadFileFormat); | |
128 } | |
129 } | |
130 | |
131 PngReader::PngReader() | |
132 { | |
133 width_ = 0; | |
134 height_ = 0; | |
135 pitch_ = 0; | |
136 format_ = PixelFormat_Grayscale8; | |
137 } | |
138 | |
139 void PngReader::Read(PngRabi& rabi) | |
140 { | |
141 png_set_sig_bytes(rabi.png_, 8); | |
142 | |
143 png_read_info(rabi.png_, rabi.info_); | |
144 | |
145 png_uint_32 width, height; | |
146 int bit_depth, color_type, interlace_type; | |
147 int compression_type, filter_method; | |
148 // get size and bit-depth of the PNG-image | |
149 png_get_IHDR(rabi.png_, rabi.info_, | |
150 &width, &height, | |
151 &bit_depth, &color_type, &interlace_type, | |
152 &compression_type, &filter_method); | |
153 | |
154 width_ = width; | |
155 height_ = height; | |
156 | |
157 if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 8) | |
158 { | |
159 format_ = PixelFormat_Grayscale8; | |
160 pitch_ = width_; | |
161 } | |
162 else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 16) | |
163 { | |
164 format_ = PixelFormat_Grayscale16; | |
165 pitch_ = 2 * width_; | |
166 | |
167 if (Toolbox::DetectEndianness() == Endianness_Little) | |
168 { | |
169 png_set_swap(rabi.png_); | |
170 } | |
171 } | |
172 else if (color_type == PNG_COLOR_TYPE_RGB && bit_depth == 8) | |
173 { | |
174 format_ = PixelFormat_Grayscale8; | |
175 pitch_ = 3 * width_; | |
176 } | |
177 else | |
178 { | |
179 throw OrthancException(ErrorCode_NotImplemented); | |
180 } | |
181 | |
182 buffer_.resize(height_ * pitch_); | |
183 | |
184 if (height_ == 0 || width_ == 0) | |
185 { | |
186 // Empty image, we are done | |
187 return; | |
188 } | |
189 | |
190 png_read_update_info(rabi.png_, rabi.info_); | |
191 | |
192 std::vector<png_bytep> rows(height_); | |
193 for (size_t i = 0; i < height_; i++) | |
194 { | |
195 rows[i] = &buffer_[0] + i * pitch_; | |
196 } | |
197 | |
198 png_read_image(rabi.png_, &rows[0]); | |
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 | |
228 namespace | |
229 { | |
230 struct MemoryBuffer | |
231 { | |
232 const uint8_t* buffer_; | |
233 size_t size_; | |
234 size_t pos_; | |
235 bool ok_; | |
236 }; | |
237 } | |
238 | |
239 | |
240 void PngReader::PngRabi::MemoryCallback(png_structp png_ptr, | |
241 png_bytep outBytes, | |
242 png_size_t byteCountToRead) | |
243 { | |
244 MemoryBuffer* from = (MemoryBuffer*) png_get_io_ptr(png_ptr); | |
245 | |
246 if (!from->ok_) | |
247 { | |
248 return; | |
249 } | |
250 | |
251 if (from->pos_ + byteCountToRead > from->size_) | |
252 { | |
253 from->ok_ = false; | |
254 return; | |
255 } | |
256 | |
257 memcpy(outBytes, from->buffer_ + from->pos_, byteCountToRead); | |
258 | |
259 from->pos_ += byteCountToRead; | |
260 } | |
261 | |
262 | |
263 void PngReader::ReadFromMemory(const void* buffer, | |
264 size_t size) | |
265 { | |
266 if (size < 8) | |
267 { | |
268 throw OrthancException(ErrorCode_BadFileFormat); | |
269 } | |
270 | |
271 CheckHeader(buffer); | |
272 | |
273 PngRabi rabi; | |
274 | |
275 if (setjmp(png_jmpbuf(rabi.png_))) | |
276 { | |
277 rabi.Destruct(); | |
278 throw OrthancException(ErrorCode_BadFileFormat); | |
279 } | |
280 | |
281 MemoryBuffer tmp; | |
282 tmp.buffer_ = reinterpret_cast<const uint8_t*>(buffer) + 8; // We skip the header | |
283 tmp.size_ = size - 8; | |
284 tmp.pos_ = 0; | |
285 tmp.ok_ = true; | |
286 | |
287 png_set_read_fn(rabi.png_, &tmp, PngRabi::MemoryCallback); | |
288 | |
289 Read(rabi); | |
290 | |
291 if (!tmp.ok_) | |
292 { | |
293 throw OrthancException(ErrorCode_BadFileFormat); | |
294 } | |
295 } | |
296 | |
297 void PngReader::ReadFromMemory(const std::string& buffer) | |
298 { | |
299 if (buffer.size() != 0) | |
300 ReadFromMemory(&buffer[0], buffer.size()); | |
301 else | |
302 ReadFromMemory(NULL, 0); | |
303 } | |
304 } |