dynamicbuffer.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_DYNAMICBUFFER_H
#define DXR3PLAYER_DYNAMICBUFFER_H
//------------------------------------------------------------------------------

#include "BufferWriterTemplate.h"

#include <cstdlib>

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

/**
 * Buffer that grows dynamically as requested.
 */
class DynamicBuffer
{
private:
    /**
     * The data of the buffer.
     */
    unsigned char* data;

    /**
     * The capacity of the buffer.
     */
    size_t capacity;

public:
    /**
     * Construct a dynamic buffer
     */
    explicit DynamicBuffer(size_t capacity = 0);

    /**
     * Destroy the dynamic buffer.
     */
    ~DynamicBuffer();

    /**
     * Reset the buffer by deleting the data area.
     */
    void reset();

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

    /**
     * Ensure that the buffer has at least the given capacity.
     */
    void ensureCapacity(size_t cap);
};

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

/**
 * Reference to a dynamic buffer.
 */
typedef WritableBufferReferenceTemplate<DynamicBuffer> DynamicBufferReference;

/**
 * Bit writer for a dynamic buffer.
 */
typedef BufferBitWriterTemplate<DynamicBufferReference> DynamicBufferBitWriter;

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

inline DynamicBuffer::DynamicBuffer(size_t capacity) :
    data(0),
    capacity(capacity)
{
    if (capacity>0) data = new unsigned char[capacity];
}

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

inline DynamicBuffer::~DynamicBuffer()
{
    delete[] data;
}

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

inline void DynamicBuffer::reset()
{
    delete[] data;
    capacity = 0;
}

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

inline unsigned char* DynamicBuffer::getData() const
{
    return data;
}

//------------------------------------------------------------------------------
#endif // DXR3PLAYER_DYNAMICBUFFER_H

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