ebml/EbmlFloat.h

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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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
**
** See http://www.matroska.org/license/lgpl/ for LGPL licensing information.
**
** Contact license@matroska.org if any conditions of this licensing are
** not clear to you.
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**********************************************************************/

#ifndef LIBEBML_FLOAT_H
#define LIBEBML_FLOAT_H

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

START_LIBEBML_NAMESPACE

class EBML_DLL_API EbmlFloat : public EbmlElement {
        public:
                enum Precision {
                         FLOAT_32
                        ,FLOAT_64
                };

                EbmlFloat(const Precision prec = FLOAT_32);
                EbmlFloat(const double DefaultValue, const Precision prec = FLOAT_32);
                EbmlFloat(const EbmlFloat & ElementToClone);

                virtual bool ValidateSize() const 
                {
                        return (GetSize() == 4 || 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);

                void SetPrecision(const EbmlFloat::Precision prec = FLOAT_32) 
                {
                        if (prec == FLOAT_64)
                                SetSize_(8);
                        else
                                SetSize_(4); // default size
                }

        
//              EbmlFloat & operator=(const float NewValue) { Value = NewValue; return *this;}
                EbmlFloat & operator=(const double NewValue) { Value = NewValue; SetValueIsSet(); return *this;}

                virtual bool IsSmallerThan(const EbmlElement *Cmp) const;
                
                operator const float() const {return float(Value);}
                operator const double() const {return double(Value);}

                void SetDefaultValue(double);
    
                const double DefaultVal() const;

                bool IsDefaultValue() const {
                        return (DefaultISset() && Value == DefaultValue);
                }
                
#if defined(EBML_STRICT_API)
    private:
#else
    protected:
#endif
                double Value; 
                double DefaultValue;
};

END_LIBEBML_NAMESPACE

#endif // LIBEBML_FLOAT_H

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