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/************************************************************************ |
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* Copyright (C) 2017-2024 IRCAD France |
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* Copyright (C) 2017 IHU Strasbourg |
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* |
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* This file is part of Sight. |
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* |
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* Sight is free software: you can redistribute it and/or modify it under |
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* the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* Sight is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Sight. If not, see <https://www.gnu.org/licenses/>. |
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* |
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***********************************************************************/ |
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#pragma once |
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#include <sight/io/dicom/config.hpp> |
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#include "io/dicom/helper/encoding.hpp" |
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#include <core/log/logger.hpp> |
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#include <gdcmAttribute.h> |
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#include <gdcmDataSet.h> |
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namespace sight::io::dicom::helper |
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{ |
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/** |
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* @brief This class contains helpers to handle GDCM data reading. |
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*/ |
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class SIGHT_IO_DICOM_CLASS_API dicom_data_reader |
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{ |
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public: |
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/** |
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* @brief Return a string from a tag found in \p dataset. |
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* An empty string returned means the tag is not found or empty. |
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* The value is returned without binary space padding. |
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* @tparam GROUP Group of the tag |
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* @tparam ELEMENT Element of the tag |
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* @param[in] _dataset Data set containing the tag |
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* @param[in] _charset Specific Character Set (if empty assuming ASCII). |
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* @param[in] _logger Logger used for encoding issue |
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* @note charset shall be set if SpecificCharacterSet (0008,0005) is |
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* defined and tag's VR is SH, LO, ST, PN, LT or UT. |
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* @return The tag value as string |
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*/ |
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template<std::uint16_t GROUP, std::uint16_t ELEMENT> |
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static std::string get_tag_value( |
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const gdcm::DataSet& _dataset, |
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const std::string& _charset = "", |
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const core::log::logger::sptr& _logger = nullptr |
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) |
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{ |
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std::string result; |
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const gdcm::Tag tag(GROUP, ELEMENT); |
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if(_dataset.FindDataElement(tag)) |
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{ |
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const gdcm::DataElement& data_element = _dataset.GetDataElement(tag); |
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if(!data_element.IsEmpty()) // Can be type 2 |
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{ |
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// Retrieve buffer |
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const gdcm::ByteValue* bv = data_element.GetByteValue(); |
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if(bv) |
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{ |
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std::string buffer(bv->GetPointer(), bv->GetLength()); |
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// Trim buffer |
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const std::string trimmed_buffer = gdcm::LOComp::Trim(buffer.c_str()); |
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try |
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{ |
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result = io::dicom::helper::encoding::convert_string(trimmed_buffer, _charset, _logger); |
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} |
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catch(const std::runtime_error& e) |
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{ |
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if(_logger) |
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{ |
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std::stringstream ss; |
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ss << "Could not read tag " << tag << " : " << e.what(); |
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_logger->warning(ss.str()); |
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} |
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result = trimmed_buffer; |
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} |
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} |
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} |
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} |
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return result; |
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} |
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/** |
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* @brief Return an utf-8 tag value from the tag value's buffer |
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* @tparam GROUP Group of the tag |
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* @tparam ELEMENT Element of the tag |
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* @param[in] _buffer Tag value's buffer |
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* @param[in] _charset Specific Character Set (if empty assuming ASCII). |
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* @param[in] _logger Logger used for encoding issue |
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* @note charset shall be set if SpecificCharacterSet (0008,0005) is |
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* defined and tag's VR is SH, LO, ST, PN, LT or UT. |
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* @return The tag value as string |
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*/ |
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template<std::uint16_t GROUP, std::uint16_t ELEMENT> |
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static std::string get_tag_value( |
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const std::string& _buffer, |
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const std::string& _charset = "", |
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const core::log::logger::sptr& _logger = nullptr |
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) |
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{ |
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std::string result; |
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const gdcm::Tag tag = gdcm::Attribute<GROUP, ELEMENT>::GetTag(); |
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// Trim buffer |
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const std::string trimmed_buffer = gdcm::LOComp::Trim(_buffer.c_str()); |
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try |
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{ |
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result = io::dicom::helper::encoding::convert_string(trimmed_buffer, _charset, _logger); |
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} |
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catch(const std::runtime_error& e) |
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{ |
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if(_logger) |
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{ |
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std::stringstream ss; |
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ss << "Could not read tag " << tag << " : " << e.what(); |
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_logger->warning(ss.str()); |
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} |
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result = trimmed_buffer; |
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} |
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return result; |
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} |
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/** |
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* @brief Return a value from a tag found in dataset. |
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* @tparam GROUP Group of the tag. |
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* @tparam ELEMENT Element of the tag. |
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* @tparam T Type of value. |
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* @param[in] _dataset Data set of tags. |
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* @return The tag value. |
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*/ |
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template<std::uint16_t GROUP, std::uint16_t ELEMENT, typename T> |
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static T get_tag_value(const gdcm::DataSet& _dataset) |
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{ |
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gdcm::Attribute<GROUP, ELEMENT> attribute {}; |
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attribute.SetFromDataSet(_dataset); |
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return attribute.GetValue(); |
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} |
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}; |
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} // namespace sight::io::dicom::helper |
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