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/**
* Orthanc - A Lightweight, RESTful DICOM Store
* Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
* Department, University Hospital of Liege, Belgium
* Copyright (C) 2017-2023 Osimis S.A., Belgium
* Copyright (C) 2024-2024 Orthanc Team SRL, Belgium
* Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, 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 <Compatibility.h>
namespace OrthancPlugins
{
std::string GdcmDecoderCache::ComputeMd5(const void* dicom,
size_t size)
{
std::string result;
char* md5 = OrthancPluginComputeMd5(OrthancPlugins::GetGlobalContext(), dicom, size);
if (md5 == NULL)
{
throw std::runtime_error("Cannot compute MD5 hash");
}
bool ok = false;
try
{
result.assign(md5);
ok = true;
}
catch (...)
{
}
OrthancPluginFreeString(OrthancPlugins::GetGlobalContext(), md5);
if (!ok)
{
throw std::runtime_error("Not enough memory");
}
else
{
return result;
}
}
OrthancImage* GdcmDecoderCache::Decode(const void* dicom,
const uint32_t size,
uint32_t frameIndex)
{
std::string md5 = ComputeMd5(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 OrthancImage(decoder_->Decode(frameIndex));
}
}
// This is not the same image
std::unique_ptr<GdcmImageDecoder> decoder(new GdcmImageDecoder(dicom, size));
std::unique_ptr<OrthancImage> image(new OrthancImage(decoder->Decode(frameIndex)));
{
// Cache the newly created decoder for further use
boost::mutex::scoped_lock lock(mutex_);
decoder_.reset(decoder.release());
size_ = size;
md5_ = md5;
}
return image.release();
}
}
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