itkInputStreamBase.cxx

/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         https://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
#include "itkInputStreamBase.h"
#include "itkPipeline.h"
#include "itkWasmStringStream.h"

#ifndef ITK_WASM_NO_MEMORY_IO
#  include "itkWasmExports.h"
#endif

#include <fstream>
#include <sstream>

namespace itk
{
namespace wasm
{
void
InputStreamBase::SetJSON(const std::string & json)
{
  const auto wasmStringStream = WasmStringStream::New();
  wasmStringStream->SetJSON(json.c_str());
  m_IStream = std::make_unique<std::stringstream>(std::move(wasmStringStream->GetStringStream()));
}


void
InputStreamBase::SetFile(const std::string & fileName, const std::ios_base::openmode openMode)
{
  m_IStream = std::make_unique<std::ifstream>(fileName, openMode);
}


InputStreamBase::~InputStreamBase() = default;


bool
lexical_cast(const std::string & input, InputStreamBase & inputStream)
{
  if (input.empty())
  {
    return false;
  }
  if (wasm::Pipeline::get_use_memory_io())
  {
#ifndef ITK_WASM_NO_MEMORY_IO
    const unsigned int index = std::stoi(input);
    const auto         json = getMemoryStoreInputJSON(0, index);
    inputStream.SetJSON(json);
#else
    return false;
#endif
  }
  else
  {
#ifndef ITK_WASM_NO_FILESYSTEM_IO
    inputStream.SetFileName(input);
#else
    return false;
#endif
  }
  return true;
}

} // end namespace wasm
} // end namespace itk