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/****************************************************************************
** libebml : parse EBML files, see http://embl.sourceforge.net/
**
** <file/class description>
**
** Copyright (C) 2002-2010 Steve Lhomme.  All rights reserved.
**
** This file is part of libebml.
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
**
** See http://www.gnu.org/licenses/lgpl-2.1.html for LGPL licensing information.
**
** Contact license@matroska.org if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/

/*!
  \file
  \version \$Id$
  \author Steve Lhomme     <robux4 @ users.sf.net>
  \author Julien Coloos    <suiryc @ users.sf.net>
  \author Moritz Bunkus    <moritz @ bunkus.org>
*/
#ifndef LIBEBML_SINTEGER_H
#define LIBEBML_SINTEGER_H

#include <cassert>

#include "EbmlTypes.h"
#include "EbmlElement.h"

START_LIBEBML_NAMESPACE

const int DEFAULT_INT_SIZE = 1; ///< optimal size stored

/*!
    \class EbmlSInteger
    \brief Handle all operations on a signed integer EBML element
*/
class EBML_DLL_API EbmlSInteger : public EbmlElement {
  public:
    EbmlSInteger();
    EbmlSInteger(int64 DefaultValue);
    EbmlSInteger(const EbmlSInteger & ElementToClone);

    EbmlSInteger & operator = (int64 NewValue) {Value = NewValue; SetValueIsSet(); return *this;}

    /*!
      Set the default size of the integer (usually 1,2,4 or 8)
    */
        virtual void SetDefaultSize(uint64 nDefaultSize = DEFAULT_INT_SIZE) {EbmlElement::SetDefaultSize(nDefaultSize); SetSize_(nDefaultSize);}

    virtual bool ValidateSize() const {return IsFiniteSize() && (GetSize() <= 8);}
    filepos_t RenderData(IOCallback & output, bool bForceRender, bool bWithDefault = false);
    filepos_t ReadData(IOCallback & input, ScopeMode ReadFully = SCOPE_ALL_DATA);
    filepos_t UpdateSize(bool bWithDefault = false, bool bForceRender = false);

    virtual bool IsSmallerThan(const EbmlElement *Cmp) const;

    operator int8() const;
    operator int16() const;
    operator int32() const;
    operator int64() const;

    EbmlSInteger &SetValue(int64 NewValue);
    int64 GetValue() const;

    void SetDefaultValue(int64 aValue) {assert(!DefaultISset()); DefaultValue = aValue; SetDefaultIsSet();}

    int64 DefaultVal() const {assert(DefaultISset()); return DefaultValue;}

    bool IsDefaultValue() const {
      return (DefaultISset() && Value == DefaultValue);
    }

#if defined(EBML_STRICT_API)
    private:
#else
    protected:
#endif
    int64 Value; /// The actual value of the element
    int64 DefaultValue;
};

END_LIBEBML_NAMESPACE

#endif // LIBEBML_SINTEGER_H