gprm.h

Linux下比较早的基于命令行的DVD播放器

//
// Copyright (c) 2002 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_VM_GPRM_H
#define DXR3PLAYER_DVD_VM_GPRM_H
//------------------------------------------------------------------------------

#include "dvd/vm/Register.h"

#include "types.h"

#include <cstdlib>
#include <cassert>

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

namespace dvd { namespace vm {

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

/**
 * General-purpose register
 */
class GPR : public Register
{
private:
    /**
     * Indicate if the register is in counter mode.
     */
    bool isCounter;

    /**
     * The time the register was set to the value, if in counter mode.
     */
    millis_t setTime;

public:
    /**
     * Construct the register with a value of 0, and no counter mode.
     */
    GPR();

    /**
     * Reset the GPR
     */
    void reset();

    /**
     * Put the register into counter mode.
     */
    void setCounter();

    /**
     * Put the register into normal mode.
     */
    void clearCounter();

    /**
     * Set the value of the register.
     */
    void setValue(unsigned x);

    /**
     * Get the value of the register.
     */
    unsigned getValue() const;

    /**
     * Save the register to the given file.
     *
     * @return if the saving has succeeded
     */
    bool save(FILE* f) const;

    /**
     * Load the register from the given file.
     *
     * @return if the loading has succeeded
     */
    bool load(FILE* f);
};

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

/**
 * General-purpose register file
 */
class GPRM
{
public:
    /**
     * The number of registers.
     */
    static const size_t numRegisters = 16;

    /**
     * The lowest register number valid to designate a GPR.
     */
    static const size_t minRegisterNumber = 0;

    /**
     * The highest register number valid to designate a GPR.
     */
    static const size_t maxRegisterNumber = minRegisterNumber + numRegisters - 1;

private:
    /**
     * The registers.
     */
    GPR registers[numRegisters];

public:
    /**
     * Reset the registers.
     */
    void reset();

    /**
     * Get the register with the given index for modification.
     */
    GPR& getRegister(size_t index);

    /**
     * Set the value of the given register.
     */
    void setValue(size_t index, unsigned value);

    /**
     * Get the register with the given index for reading.
     */
    const GPR& getRegister(size_t index) const;

    /**
     * Get the value of the given register.
     */
    unsigned getValue(size_t index) const;

    /**
     * Save the register file to the given file.
     *
     * @return if the saving has succeeded
     */
    bool save(FILE* f) const;

    /**
     * Load the register file from the given file.
     *
     * @return if the loading has succeeded
     */
    bool load(FILE* f);
};

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

inline GPR::GPR() : isCounter(false), setTime(0)
{
}

//------------------------------------------------------------------------------
// GPRM
//------------------------------------------------------------------------------

inline GPR& GPRM::getRegister(size_t index)
{
    assert(index<numRegisters);
    return registers[index];
}

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

inline void GPRM::setValue(size_t index, unsigned value)
{
    getRegister(index).setValue(value);
}

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

inline unsigned GPRM::getValue(size_t index) const
{
    return getRegister(index).getValue();
}

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

inline const GPR& GPRM::getRegister(size_t index) const
{
    assert(index<numRegisters);
    return registers[index];
}

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

} /* namespace dvd::vm */ } /* namespace dvd */

//------------------------------------------------------------------------------
#endif // DXR3PLAYER_DVD_VM_GPRM_H

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