helper-osx.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#ifndef NDN_SECURITY_TPM_HELPER_OSX_HPP
#define NDN_SECURITY_TPM_HELPER_OSX_HPP

#include "../../common.hpp"

#ifndef NDN_CXX_HAVE_OSX_SECURITY
#error "This file should not be included ..."
#endif

#include <CoreFoundation/CoreFoundation.h>
#include <Security/Security.h>

namespace ndn {
namespace security {
namespace tpm {

template<class T>
class CFReleaser
{
public: // Construction/destruction
  CFReleaser()
    : m_typeRef(nullptr)
  {
  }

  CFReleaser(const T& typeRef)
    : m_typeRef(typeRef)
  {
  }

  CFReleaser(const CFReleaser& inReleaser)
    : m_typeRef(nullptr)
  {
    retain(inReleaser.m_typeRef);
  }

  CFReleaser&
  operator=(const T& typeRef)
  {
    if (typeRef != m_typeRef) {
      release();
      m_typeRef = typeRef;
    }
    return *this;
  }

  CFReleaser&
  operator=(const CFReleaser& inReleaser)
  {
    retain(inReleaser.m_typeRef);
    return *this;
  }

  ~CFReleaser()
  {
    release();
  }

public: // Access
  const T&
  get() const
  {
    return m_typeRef;
  }

  T&
  get()
  {
    return m_typeRef;
  }

  bool
  operator==(const std::nullptr_t&)
  {
    return m_typeRef == nullptr;
  }

  bool
  operator!=(const std::nullptr_t&)
  {
    return m_typeRef != nullptr;
  }

  // Miscellaneous //

  void
  retain(const T& typeRef)
  {
    if (typeRef != nullptr) {
      CFRetain(typeRef);
    }
    release();
    m_typeRef = typeRef;
  }

  void
  retain()
  {
    T typeRef = m_typeRef;
    m_typeRef = nullptr;
    retain(typeRef);
  }

  void
  release()
  {
    if (m_typeRef != nullptr) {
      CFRelease(m_typeRef);
      m_typeRef = nullptr;
    }
  };

private:
  T m_typeRef;
};

typedef CFReleaser<SecKeyRef> KeyRefOsx;

} // namespace tpm
} // namespace security
} // namespace ndn

#endif // NDN_SECURITY_TPM_HELPER_OSX_HPP