file.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_FILE_H
#define DXR3PLAYER_DVD_FILE_H
//------------------------------------------------------------------------------

#include "FileHandler.h"

#include <cstdlib>
#include <cassert>

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

namespace dvd {

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

/**
 * A DVD file.
 */
class File
{
    /**
     * The file handler.
     */
    FileHandler* fileHandler;

public:
    /**
     * Construct the file.
     */
    File(FileHandler* fileHandler = 0);

    /**
     * Copy the file.
     */
    File(const File& other);

    /**
     * Destroy the file.
     */
    ~File();

    /**
     * Assign to the file.
     */
    File& operator=(const File& other);

    /**
     * Convert to a boolean value. If true, a valid file is opened. 
     */
    operator bool() const;

    /**
     * Get the number of sectors in this file.
     */
    size_t getLength() const;

    /**
     * Read a number of sectors from the given offset.
     */
    void readSectors(void* dest, size_t offset, size_t numSectors);

    /**
     * Close the file.
     */
    void close();
};

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

inline File::File(FileHandler* fileHandler) :
    fileHandler(fileHandler)
{
    if (fileHandler!=0) fileHandler->addReference();
}

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

inline File::File(const File& other) :
    fileHandler(other.fileHandler)
{
    if (fileHandler!=0) fileHandler->addReference();
}

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

inline File::~File()
{
    if (fileHandler!=0 && fileHandler->removeReference()==0) {
        delete fileHandler;
    }
}

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

inline File& File::operator=(const File& other)
{
    if (fileHandler!=0 && fileHandler->removeReference()==0) {
        delete fileHandler;
    }
    
    fileHandler = other.fileHandler;
    if (fileHandler!=0) fileHandler->addReference();

    return *this;
}

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

inline File::operator bool() const
{
    return fileHandler!=0;
}

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

inline size_t File::getLength() const
{
    return fileHandler->getLength();
}

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

inline void File::readSectors(void* dest, size_t offset, size_t numSectors)
{
    fileHandler->readSectors(dest, offset, numSectors);
}

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

inline void File::close()
{
    if (fileHandler!=0 && fileHandler->removeReference()==0) {
        delete fileHandler;
    }
    fileHandler = 0;
}

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

} /* namespace dvd */

//------------------------------------------------------------------------------
#endif // DXR3PLAYER_DVD_FILE_H

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