readersectorpart.h

Linux下比较早的基于命令行的DVD播放器

//
// Copyright (c) 2003 by Istv醤 V醨adi
//
// This file is part of dxr3Player, a DVD player written specifically 
// for the DXR3 (aka Hollywood+) decoder card.

// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#ifndef DXR3PLAYER_DVD_READER_READERSECTORPART_H
#define DXR3PLAYER_DVD_READER_READERSECTORPART_H
//------------------------------------------------------------------------------

#include "dvd/reader/ReaderSectorReference.h"

//------------------------------------------------------------------------------

namespace dvd { namespace reader {

//------------------------------------------------------------------------------

/**
 * Reference to a part of a sector.
 */
class ReaderSectorPart
{
private:
    /**
     * Reference to the sector.
     */
    ReaderSectorReference sector;

    /**
     * The offset of the data within the sector.
     */
    size_t offset;

    /**
     * The length of the data within the sector.
     */
    size_t length;

public:
    /**
     * Default constructor.
     */
    ReaderSectorPart();

    /**
     * Construct a sector part.
     */
    ReaderSectorPart(ReaderSectorReference sector,
                     size_t offset, size_t length);

    /**
     * Reset the sector part by erasing the sector.
     */
    void reset();

    /**
     * Check if the sector part is valid or not.
     */
    bool isValid() const;

    /**
     * Get the data.
     */
    const unsigned char* getData() const;

    /**
     * Get the length of the data.
     */
    size_t getLength() const;
};

//------------------------------------------------------------------------------
// Inline definitions
//------------------------------------------------------------------------------

inline ReaderSectorPart::ReaderSectorPart() :
    offset(0), length(0)
{
}

//------------------------------------------------------------------------------

inline ReaderSectorPart::
ReaderSectorPart(ReaderSectorReference sector,
                 size_t offset, size_t length) :
    sector(sector), offset(offset), length(length)
{
}

//------------------------------------------------------------------------------

inline void ReaderSectorPart::reset()
{
    sector.reset();
    offset = length = 0;
}

//------------------------------------------------------------------------------

inline bool ReaderSectorPart::isValid() const
{
    return sector.isValid() && length>0;
}

//------------------------------------------------------------------------------

inline const unsigned char* ReaderSectorPart::getData() const
{
    return sector.getSector().getData() + offset;
}

//------------------------------------------------------------------------------

inline size_t ReaderSectorPart::getLength() const
{
    return length;
}

//------------------------------------------------------------------------------

} /* namespace dvd::reader */ } /* namespace dvd */

//------------------------------------------------------------------------------
#endif // DXR3PLAYER_DVD_READER_READERSECTORPART_H

// Local variables:
// mode: c++
// End: