vtkResourceStream.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkResourceStream_h
#define vtkResourceStream_h
 
#include "vtkIOCoreModule.h" // For export macro
#include "vtkObject.h"
#include "vtkSmartPointer.h" // For vtkSmartPointer
 
#include <cstdlib>   // for std::size_t
#include <memory>    // for std::unique_ptr
#include <streambuf> // for std::basic_streambuf
 
VTK_ABI_NAMESPACE_BEGIN

class VTKIOCORE_EXPORT vtkResourceStream : public vtkObject
{
  struct vtkInternals;
 
public:
  enum class SeekDirection
  {
    Begin = 0,
    Current = 1,
    End = 2
  };
 
  vtkTypeMacro(vtkResourceStream, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  virtual std::size_t Read(void* buffer, std::size_t bytes) = 0;

  virtual bool EndOfStream() = 0;

  virtual vtkTypeInt64 Seek(vtkTypeInt64 pos, SeekDirection dir);

  virtual vtkTypeInt64 Tell();

  bool SupportSeek() const;
 
#ifndef __VTK_WRAP__
  std::unique_ptr<std::streambuf> ToStreambuf();
#endif
 
protected:
  vtkResourceStream(bool supportSeek);
  ~vtkResourceStream() override;
  vtkResourceStream(const vtkResourceStream&) = delete;
  vtkResourceStream& operator=(const vtkResourceStream&) = delete;
 
private:
  std::unique_ptr<vtkInternals> Impl;
};
 
VTK_ABI_NAMESPACE_END
 
#endif