Mercurial > hg > orthanc-webviewer
diff Orthanc/Plugins/Samples/GdcmDecoder/GdcmDecoderCache.cpp @ 107:c9d29eb5db29 refactoring
sync
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 02 Dec 2015 16:27:28 +0100 |
parents | |
children | 3809121c3290 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Orthanc/Plugins/Samples/GdcmDecoder/GdcmDecoderCache.cpp Wed Dec 02 16:27:28 2015 +0100 @@ -0,0 +1,98 @@ +/** + * Orthanc - A Lightweight, RESTful DICOM Store + * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics + * Department, University Hospital of Liege, Belgium + * + * This program is free software: you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation, either version 3 of the + * License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + **/ + + +#include "GdcmDecoderCache.h" + +#include "OrthancImageWrapper.h" + +namespace OrthancPlugins +{ + std::string GdcmDecoderCache::ComputeMd5(OrthancPluginContext* context, + const void* dicom, + size_t size) + { + std::string result; + + char* md5 = OrthancPluginComputeMd5(context, dicom, size); + + if (md5 == NULL) + { + throw std::runtime_error("Cannot compute MD5 hash"); + } + + bool ok = false; + try + { + result.assign(md5); + ok = true; + } + catch (...) + { + } + + OrthancPluginFreeString(context, md5); + + if (!ok) + { + throw std::runtime_error("Not enough memory"); + } + else + { + return result; + } + } + + + OrthancImageWrapper* GdcmDecoderCache::Decode(OrthancPluginContext* context, + const void* dicom, + const uint32_t size, + uint32_t frameIndex) + { + std::string md5 = ComputeMd5(context, dicom, size); + + // First check whether the previously decoded image is the same + // as this one + { + boost::mutex::scoped_lock lock(mutex_); + + if (decoder_.get() != NULL && + size_ == size && + md5_ == md5) + { + // This is the same image: Reuse the previous decoding + return new OrthancImageWrapper(context, decoder_->Decode(context, frameIndex)); + } + } + + // This is not the same image + std::auto_ptr<GdcmImageDecoder> decoder(new GdcmImageDecoder(dicom, size)); + std::auto_ptr<OrthancImageWrapper> image(new OrthancImageWrapper(context, decoder->Decode(context, frameIndex))); + + { + // Cache the newly created decoder for further use + boost::mutex::scoped_lock lock(mutex_); + decoder_ = decoder; + size_ = size; + md5_ = md5; + } + + return image.release(); + } +}