Mercurial > hg > orthanc
annotate Plugins/Samples/GdcmDecoder/GdcmDecoderCache.cpp @ 3103:81b58b549845
back to using 'var' instead of 'let' since let is not supported by many old browsers. All variables declaration have been moved to the top of the function to better show that their scope is the function
| author | Alain Mazy <alain@mazy.be> |
|---|---|
| date | Thu, 10 Jan 2019 10:51:36 +0100 |
| parents | 4e43e67f8ecf |
| children | 94f4a18a79cc |
| rev | line source |
|---|---|
| 1834 | 1 /** |
| 2 * Orthanc - A Lightweight, RESTful DICOM Store | |
| 1900 | 3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics |
| 1834 | 4 * Department, University Hospital of Liege, Belgium |
|
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5 * Copyright (C) 2017-2019 Osimis S.A., Belgium |
| 1834 | 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 * This program is distributed in the hope that it will be useful, but | |
| 13 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 * General Public License for more details. | |
| 16 * | |
| 17 * You should have received a copy of the GNU General Public License | |
| 18 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 **/ | |
| 20 | |
| 21 | |
| 22 #include "GdcmDecoderCache.h" | |
| 23 | |
| 24 #include "OrthancImageWrapper.h" | |
| 25 | |
| 26 namespace OrthancPlugins | |
| 27 { | |
| 28 std::string GdcmDecoderCache::ComputeMd5(OrthancPluginContext* context, | |
| 29 const void* dicom, | |
| 30 size_t size) | |
| 31 { | |
| 32 std::string result; | |
| 33 | |
| 34 char* md5 = OrthancPluginComputeMd5(context, dicom, size); | |
| 35 | |
| 36 if (md5 == NULL) | |
| 37 { | |
| 38 throw std::runtime_error("Cannot compute MD5 hash"); | |
| 39 } | |
| 40 | |
| 41 bool ok = false; | |
| 42 try | |
| 43 { | |
| 44 result.assign(md5); | |
| 45 ok = true; | |
| 46 } | |
| 47 catch (...) | |
| 48 { | |
| 49 } | |
| 50 | |
| 51 OrthancPluginFreeString(context, md5); | |
| 52 | |
| 53 if (!ok) | |
| 54 { | |
| 55 throw std::runtime_error("Not enough memory"); | |
| 56 } | |
| 57 else | |
| 58 { | |
| 59 return result; | |
| 60 } | |
| 61 } | |
| 62 | |
| 63 | |
| 1837 | 64 OrthancImageWrapper* GdcmDecoderCache::Decode(OrthancPluginContext* context, |
| 65 const void* dicom, | |
| 66 const uint32_t size, | |
| 67 uint32_t frameIndex) | |
| 1834 | 68 { |
| 69 std::string md5 = ComputeMd5(context, dicom, size); | |
| 70 | |
| 71 // First check whether the previously decoded image is the same | |
| 72 // as this one | |
| 73 { | |
| 74 boost::mutex::scoped_lock lock(mutex_); | |
| 75 | |
| 76 if (decoder_.get() != NULL && | |
| 77 size_ == size && | |
| 78 md5_ == md5) | |
| 79 { | |
| 80 // This is the same image: Reuse the previous decoding | |
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81 return new OrthancImageWrapper(context, decoder_->Decode(context, frameIndex)); |
| 1834 | 82 } |
| 83 } | |
| 84 | |
| 85 // This is not the same image | |
| 86 std::auto_ptr<GdcmImageDecoder> decoder(new GdcmImageDecoder(dicom, size)); | |
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87 std::auto_ptr<OrthancImageWrapper> image(new OrthancImageWrapper(context, decoder->Decode(context, frameIndex))); |
| 1834 | 88 |
| 89 { | |
| 90 // Cache the newly created decoder for further use | |
| 91 boost::mutex::scoped_lock lock(mutex_); | |
| 92 decoder_ = decoder; | |
| 93 size_ = size; | |
| 94 md5_ = md5; | |
| 95 } | |
| 96 | |
| 1837 | 97 return image.release(); |
| 1834 | 98 } |
| 99 } |