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/************************************************************************
*
* Copyright (C) 2017-2022 IRCAD France
* Copyright (C) 2017 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/>.
*
***********************************************************************/
#pragma once
#include "io/dicom/config.hpp"
#include "io/dicom/helper/Encoding.hpp"
#include <core/log/Logger.hpp>
#include <gdcmAttribute.h>
#include <gdcmDataSet.h>
namespace sight::io::dicom
{
namespace helper
{
/**
* @brief This class contains helpers to handle GDCM data reading.
*/
class IO_DICOM_CLASS_API DicomDataReader
{
public:
/**
* @brief Return a string from a tag found in \p dataset.
* An empty string returned means the tag is not found or empty.
* The value is returned without binary space padding.
* @tparam GROUP Group of the tag
* @tparam ELEMENT Element of the tag
* @param[in] dataset Data set containing the tag
* @param[in] charset Specific Character Set (if empty assuming ASCII).
* @param[in] logger Logger used for encoding issue
* @note charset shall be set if SpecificCharacterSet (0008,0005) is
* defined and tag's VR is SH, LO, ST, PN, LT or UT.
* @return The tag value as string
*/
template<std::uint16_t GROUP, std::uint16_t ELEMENT>
static std::string getTagValue(
const gdcm::DataSet& dataset,
const std::string& charset = "",
const core::log::Logger::sptr& logger = nullptr
)
{
std::string result = "";
const gdcm::Tag tag(GROUP, ELEMENT);
if(dataset.FindDataElement(tag))
{
const gdcm::DataElement& dataElement = dataset.GetDataElement(tag);
if(!dataElement.IsEmpty()) // Can be type 2
{
// Retrieve buffer
const gdcm::ByteValue* bv = dataElement.GetByteValue();
if(bv)
{
std::string buffer(bv->GetPointer(), bv->GetLength());
// Trim buffer
const std::string trimmedBuffer = gdcm::LOComp::Trim(buffer.c_str());
try
{
result = io::dicom::helper::Encoding::convertString(trimmedBuffer, charset, logger);
}
catch(const std::runtime_error& e)
{
if(logger)
{
std::stringstream ss;
ss << "Could not read tag " << tag << " : " << e.what();
logger->warning(ss.str());
}
result = trimmedBuffer;
}
}
}
}
return result;
}
/**
* @brief Return an utf-8 tag value from the tag value's buffer
* @tparam GROUP Group of the tag
* @tparam ELEMENT Element of the tag
* @param[in] buffer Tag value's buffer
* @param[in] charset Specific Character Set (if empty assuming ASCII).
* @param[in] logger Logger used for encoding issue
* @note charset shall be set if SpecificCharacterSet (0008,0005) is
* defined and tag's VR is SH, LO, ST, PN, LT or UT.
* @return The tag value as string
*/
template<std::uint16_t GROUP, std::uint16_t ELEMENT>
static std::string getTagValue(
const std::string& buffer,
const std::string& charset = "",
const core::log::Logger::sptr& logger = 0
)
{
std::string result = "";
const gdcm::Tag tag = gdcm::Attribute<GROUP, ELEMENT>::GetTag();
// Trim buffer
const std::string trimmedBuffer = gdcm::LOComp::Trim(buffer.c_str());
try
{
result = io::dicom::helper::Encoding::convertString(trimmedBuffer, charset, logger);
}
catch(const std::runtime_error& e)
{
if(logger)
{
std::stringstream ss;
ss << "Could not read tag " << tag << " : " << e.what();
logger->warning(ss.str());
}
result = trimmedBuffer;
}
return result;
}
/**
* @brief Return a value from a tag found in dataset.
* @tparam GROUP Group of the tag.
* @tparam ELEMENT Element of the tag.
* @tparam T Type of value.
* @param[in] dataset Data set of tags.
* @return The tag value.
*/
template<std::uint16_t GROUP, std::uint16_t ELEMENT, typename T>
static const T getTagValue(const gdcm::DataSet& dataset)
{
gdcm::Attribute<GROUP, ELEMENT> attribute;
attribute.SetFromDataSet(dataset);
return attribute.GetValue();
}
};
} // namespace helper
} // namespace sight::io::dicom
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