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/************************************************************************
*
* Copyright (C) 2009-2022 IRCAD France
* Copyright (C) 2012-2019 IHU Strasbourg
*
* This file is part of Sight.
*
* Sight is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Sight 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Sight. If not, see <https://www.gnu.org/licenses/>.
*
***********************************************************************/
#include "io/dicom/helper/DicomSearch.hpp"
#include <core/base.hpp>
#include <core/jobs/Observer.hpp>
#include <fstream>
/**
* Do not mark `DICM` as incorrect.
* cspell:ignore DICM
*/
namespace sight::io::dicom
{
namespace helper
{
//------------------------------------------------------------------------------
bool isDICOM(const std::filesystem::path& filepath)
{
std::ifstream ifs(filepath, std::ios::binary);
ifs.seekg(128);
char DICOM[5] = {0};
ifs.read(DICOM, 4);
ifs.close();
return strcmp(DICOM, "DICM") == 0;
}
//------------------------------------------------------------------------------
void DicomSearch::searchRecursively(
const std::filesystem::path& dirPath,
std::vector<std::filesystem::path>& dicomFiles,
bool checkIsDicom,
const core::jobs::Observer::sptr& readerObserver
)
{
std::vector<std::filesystem::path> fileVect;
checkFilenameExtension(dirPath, fileVect, readerObserver);
if(checkIsDicom)
{
if(readerObserver)
{
readerObserver->setTotalWorkUnits(fileVect.size());
}
std::uint64_t progress = 0;
for(auto file : fileVect)
{
if(readerObserver)
{
readerObserver->doneWork(++progress);
if(readerObserver->cancelRequested())
{
dicomFiles.clear();
break;
}
}
bool isDicom = isDICOM(file);
if(isDicom)
{
dicomFiles.push_back(file);
}
SIGHT_WARN_IF("Failed to read: " + file.string(), !isDicom);
}
}
else
{
dicomFiles = fileVect;
}
}
//------------------------------------------------------------------------------
void DicomSearch::checkFilenameExtension(
const std::filesystem::path& dirPath,
std::vector<std::filesystem::path>& dicomFiles,
const core::jobs::Observer::sptr& fileLookupObserver
)
{
dicomFiles.clear();
std::set<std::string> extensions = {".jpg", ".jpeg", ".htm", ".html", ".txt", ".xml",
".stm", ".str", ".lst", ".ifo", ".pdf", ".gif",
".png", ".exe", ".zip", ".gz", ".dir", ".dll", ".inf",
".DS_Store"
};
for(std::filesystem::recursive_directory_iterator it(dirPath) ;
it != std::filesystem::recursive_directory_iterator() ; ++it)
{
if(fileLookupObserver && fileLookupObserver->cancelRequested())
{
dicomFiles.clear();
break;
}
if(!std::filesystem::is_directory(*it))
{
auto path = it->path();
std::string ext = path.extension().string();
std::transform(ext.begin(), ext.end(), ext.begin(), tolower);
if(extensions.find(ext) == extensions.end())
{
std::string stem = path.stem().string();
std::transform(stem.begin(), stem.end(), stem.begin(), tolower);
if(stem != "dicomdir")
{
dicomFiles.push_back(path.string());
}
}
}
}
}
//------------------------------------------------------------------------------
} //namespace helper
} //namespace sight::io::dicom
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