/*
 * Copyright (C) 2007-2023 Xagasoft, All rights reserved.
 *
 * This file is part of the libbu++ library and is released under the
 * terms of the license contained in the file LICENSE.
 */

#ifndef BU_BUFFER_H
#define BU_BUFFER_H

#include "bu/filter.h"

namespace Bu
{
    class Buffer : public Bu::Filter
    {
    public:
        Buffer( Bu::Stream &rNext, int iWhat=Both, int iBufSize=4096 );
        virtual ~Buffer();

        enum
        {
            Write   = 1,
            Read    = 2,
            Both    = 3
        };

        virtual void start();
        virtual Bu::size stop();

        virtual Bu::size read( void *pBuf, Bu::size nBytes );
        virtual Bu::size write( const void *pBuf, Bu::size nBytes );
        using Stream::write;

        Bu::size getReadFill() { return iReadBufFill; }
        bool isWritePending() { return iWriteBufFill > 0; }

        virtual void flush();

        virtual bool isEos();

    private:
        void fillReadBuf();

    private:
        Bu::size sSoFar;
        int iBufSize;
        char *sReadBuf;
        char *sWriteBuf;
        int iReadBufFill;
        int iReadPos;
        int iWriteBufFill;
        int iWritePos;
        int iWhat;
    };
};

#endif
