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comparison Core/Images/PamReader.cpp @ 2699:52217dc47a4e

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new image/pam MIME TYPE supported in /instances/../frames/../image-uint8... routes
author am@osimis.io
date Thu, 05 Jul 2018 12:25:00 +0200
parents
children f77c7b48f798
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2687:2c684841da15 2699:52217dc47a4e
1 /**
2 * Orthanc - A Lightweight, RESTful DICOM Store
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
4 * Department, University Hospital of Liege, Belgium
5 * Copyright (C) 2017-2018 Osimis S.A., Belgium
6 *
7 * This program is free software: you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation, either version 3 of the
10 * License, or (at your option) any later version.
11 *
12 * In addition, as a special exception, the copyright holders of this
13 * program give permission to link the code of its release with the
14 * OpenSSL project's "OpenSSL" library (or with modified versions of it
15 * that use the same license as the "OpenSSL" library), and distribute
16 * the linked executables. You must obey the GNU General Public License
17 * in all respects for all of the code used other than "OpenSSL". If you
18 * modify file(s) with this exception, you may extend this exception to
19 * your version of the file(s), but you are not obligated to do so. If
20 * you do not wish to do so, delete this exception statement from your
21 * version. If you delete this exception statement from all source files
22 * in the program, then also delete it here.
23 *
24 * This program is distributed in the hope that it will be useful, but
25 * WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
27 * General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with this program. If not, see <http://www.gnu.org/licenses/>.
31 **/
32
33
34 #include "../PrecompiledHeaders.h"
35 #include "PamReader.h"
36
37 #include "../OrthancException.h"
38 #include "../Toolbox.h"
39 #include <istream>
40 #include <sstream>
41 #include <fstream>
42 #include <endian.h>
43 #if ORTHANC_SANDBOXED == 0
44 # include "../SystemToolbox.h"
45 #endif
46
47 #include <string.h>
48
49 namespace Orthanc
50 {
51 namespace
52 {
53 void GetPixelFormat(PixelFormat& format, unsigned int& bytesPerChannel, const unsigned int& maxValue, const unsigned int& channelCount, const char* tupleType)
54 {
55 if (strcmp(tupleType, "GRAYSCALE") == 0 && channelCount == 1)
56 {
57 if (maxValue == 255)
58 {
59 format = PixelFormat_Grayscale8;
60 bytesPerChannel = 1;
61 return;
62 }
63 else if (maxValue == 65535)
64 {
65 format = PixelFormat_Grayscale16;
66 bytesPerChannel = 2;
67 return;
68 }
69 }
70 else if (strcmp(tupleType, "RGB") == 0 && channelCount == 3)
71 {
72 if (maxValue == 255)
73 {
74 format = PixelFormat_RGB24;
75 bytesPerChannel = 1;
76 return;
77 }
78 else if (maxValue == 65535)
79 {
80 format = PixelFormat_RGB48;
81 bytesPerChannel = 2;
82 return;
83 }
84 }
85 throw OrthancException(ErrorCode_NotImplemented);
86 }
87
88 void ReadDelimiter(std::istream& input, const char* expectedDelimiter)
89 {
90 std::string delimiter;
91 input >> delimiter;
92 if (delimiter != expectedDelimiter)
93 {
94 throw OrthancException(ErrorCode_BadFileFormat);
95 }
96 }
97
98 unsigned int ReadKeyValueUint(std::istream& input, const char* expectedKey)
99 {
100 std::string key;
101 unsigned int value;
102 input >> key >> value;
103 if (key != expectedKey)
104 {
105 throw OrthancException(ErrorCode_BadFileFormat);
106 }
107 return value;
108 }
109
110 std::string ReadKeyValueString(std::istream& input, const char* expectedKey)
111 {
112 std::string key;
113 std::string value;
114 input >> key >> value;
115 if (key != expectedKey)
116 {
117 throw OrthancException(ErrorCode_BadFileFormat);
118 }
119 return value;
120 }
121 }
122
123 void PamReader::ReadFromStream(std::istream& input)
124 {
125 ReadDelimiter(input, "P7");
126 unsigned int width = ReadKeyValueUint(input, "WIDTH");
127 unsigned int height = ReadKeyValueUint(input, "HEIGHT");
128 unsigned int channelCount = ReadKeyValueUint(input, "DEPTH");
129 unsigned int maxValue = ReadKeyValueUint(input, "MAXVAL");
130 std::string tupleType = ReadKeyValueString(input, "TUPLTYPE");
131 ReadDelimiter(input, "ENDHDR");
132 // skip last EOL
133 char tmp[16];
134 input.getline(tmp, 16);
135
136 unsigned int bytesPerChannel;
137 PixelFormat format;
138 GetPixelFormat(format, bytesPerChannel, maxValue, channelCount, tupleType.c_str());
139
140 // read the pixels data
141 unsigned int sizeInBytes = width * height * channelCount * bytesPerChannel;
142 data_.reserve(sizeInBytes);
143 input.read(data_.data(), sizeInBytes);
144
145 AssignWritable(format, width, height, width * channelCount * bytesPerChannel, data_.data());
146
147 // swap bytes
148 if (Toolbox::DetectEndianness() == Endianness_Little && bytesPerChannel == 2)
149 {
150 uint16_t* pixel = NULL;
151 for (unsigned int h = 0; h < height; ++h)
152 {
153 pixel = reinterpret_cast<uint16_t*> (data_.data() + h * width * channelCount * bytesPerChannel);
154 for (unsigned int w = 0; w < (width * channelCount); ++w, ++pixel)
155 {
156 *pixel = htobe16(*pixel);
157 }
158 }
159 }
160
161 }
162
163 #if ORTHANC_SANDBOXED == 0
164 void PamReader::ReadFromFile(const std::string& filename)
165 {
166 std::ifstream inputStream(filename, std::ofstream::binary);
167 ReadFromStream(inputStream);
168 }
169 #endif
170
171 void PamReader::ReadFromMemory(const void* buffer,
172 size_t size)
173 {
174 std::istringstream inputStream(std::string(reinterpret_cast<const char*>(buffer), size));
175 ReadFromStream(inputStream);
176 }
177
178 void PamReader::ReadFromMemory(const std::string& buffer)
179 {
180 std::istringstream inputStream(buffer);
181 ReadFromStream(inputStream);
182 }
183
184 }