buffer.h

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
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 * The contents of this file, and the files included with this file, are 
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 * Version 1.0 (the "RPSL") available at 
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 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
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 * This file is part of the Helix DNA Technology. RealNetworks is the 
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 * ***** END LICENSE BLOCK ***** */ 

#ifndef _BUFFER_H_
#define _BUFFER_H_

class Buffer {
public:
			Buffer();
    virtual		~Buffer();

    Byte*		base;
    Byte*		limit;
    Byte*		data;
    Byte*		space;
    int			refcount;
    int			init(int s);
    virtual void	ensure_space(int required) = 0;
    int			count();
    int			space_count();
    int			size();
    int			used();
};

class WrapBuffer : public Buffer {
public:
    void	ensure(int required);
    void	ensure_space(int required);
};

class GrowBuffer : public Buffer {
public:
    void	grow(int s);
    void	ensure_space(int required);
};

inline int
Buffer::count() {
    return space - data;
}

inline int
Buffer::space_count() {
    return limit - space;
}

inline int
Buffer::size()
{
    return limit - base;
}

inline int
Buffer::used()
{
    return space - base;
}

inline int
Buffer::init(int size) {
    base = data = space = new Byte[size];
    if (!space)
	return -1;
    limit = base + size;
    return 0;
}

#endif/*_BUFFER_H_*/