ebml/EbmlId.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.
**
**********************************************************************/

#ifndef LIBEBML_ID_H
#define LIBEBML_ID_H

#include "EbmlTypes.h"

START_LIBEBML_NAMESPACE


#if defined(EBML_STRICT_API)
#define EBML_ID_VALUE(id)  (id).GetValue()
#define EBML_ID_LENGTH(id) (id).GetLength()
#else
#define EBML_ID_VALUE(id)  (id).Value
#define EBML_ID_LENGTH(id) (id).Length
#endif

class EBML_DLL_API EbmlId {
        public:
                EbmlId(const binary aValue[4], const unsigned int aLength)
                        :Length(aLength)
                {
                        Value = 0;
                        unsigned int i;
                        for (i=0; i<aLength; i++) {
                                Value <<= 8;
                                Value += aValue[i];
                        }
                }

                EbmlId(const uint32 aValue, const unsigned int aLength)
                        :Value(aValue), Length(aLength) {}

                inline bool operator==(const EbmlId & TestId) const
                {
                        return ((TestId.Length == Length) && (TestId.Value == Value));
                }
                inline bool operator!=(const EbmlId & TestId) const
                {
                        return !(*this == TestId);
                }

                inline void Fill(binary * Buffer) const {
                        unsigned int i;
                        for (i = 0; i<Length; i++) {
                                Buffer[i] = (Value >> (8*(Length-i-1))) & 0xFF;
                        }
                }

        inline size_t GetLength() const { return Length; }
        inline uint32 GetValue() const { return Value; }

#if defined(EBML_STRICT_API)
    private:
#endif
                uint32 Value;
                size_t Length;
};

END_LIBEBML_NAMESPACE

#endif // LIBEBML_ID_H

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