/*=========================================================================

  Program: GDCM (Grassroots DICOM). A DICOM library

  Copyright (c) 2006-2011 Mathieu Malaterre
  All rights reserved.
  See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef GDCMPREAMBLE_H
#define GDCMPREAMBLE_H

#include "gdcmTypes.h"
#include "gdcmVL.h"

namespace gdcm
{

/**
 * \brief DICOM Preamble (Part 10)
 */
class GDCM_EXPORT Preamble
{
public:
  Preamble();
  ~Preamble();

  friend std::ostream &operator<<(std::ostream &_os, const Preamble &_val);

  /// Clear
  void Clear();

  /// Set Preamble to the default one
  void Valid();
  void Create();
  void Remove();

  /// Read Preamble
  std::istream &Read(std::istream &is);

  /// Write Preamble
  std::ostream const &Write(std::ostream &os) const;

  /// Print Preamble
  void Print(std::ostream &os) const;

  /// Get internal pointer to preamble
  const char *GetInternal() const { return Internal; }

  /// Check if Preamble is empty
  bool IsEmpty() const { return !Internal; }

  /// Return size of Preamble
  VL GetLength() const { return 128 + 4; }

  Preamble(Preamble const &)
    {
    Create();
    }
  Preamble& operator=(Preamble const &)
    {
    Create();
    return *this;
    }
protected:
  //
  bool IsValid() const {
    // is (IsValid == true) => Internal was read
    return true;
  }

private:
  char *Internal;
};
//-----------------------------------------------------------------------------
inline std::ostream& operator<<(std::ostream &os, const Preamble &val)
{
  os << val.Internal;
  return os;
}

} // end namespace gdcm

#endif //GDCMPREAMBLE_H