Buffer.h

/*
 * /home/ms/files/source/libsidtune/RCS/Buffer.h,v
 *
 * Copyright (C) Michael Schwendt <mschwendt@yahoo.com>
 *
 *  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 BUFFER_H
#define BUFFER_H

#include <assert.h>
#include "sidtypes.h"

template <class T> class Buffer_sidtt
{
 public:
        Buffer_sidtt(void) : dummy(0)
        {
                kill();
        }

        Buffer_sidtt(T* inBuf, uint_least32_t inLen) : dummy(0)
        {
                kill();
                if (inBuf!=0 && inLen!=0)
                {       
                        buf = inBuf;
                        bufLen = inLen;
                }
        }
        
        bool assign(T* newBuf, uint_least32_t newLen)
        {
                erase();
                buf = newBuf;
                bufLen = newLen;
                return (buf!=0);
        }
        
        T* get(void) const  { return buf; }
        uint_least32_t len(void) const  { return bufLen; }
        
        T* xferPtr(void)  
        {
                T* tmpBuf = buf;
                buf = 0;
                return tmpBuf;
        }

        uint_least32_t xferLen(void)  
        {
                uint_least32_t tmpBufLen = bufLen;
                bufLen = 0;
                return tmpBufLen;
        }

        T& operator[](uint_least32_t index)
        {
                if (index < bufLen)
                        return buf[index];
                else
                        return dummy;
        }
        
        bool isEmpty(void) const  { return (buf==0); }

        void erase(void)
        {
                if (buf!=0 && bufLen!=0)
                {
#ifndef SID_HAVE_BAD_COMPILER
                        delete[] buf;
#else
                        delete[] (void *) buf;
#endif
                }
                kill();
        }
        
        ~Buffer_sidtt(void)
        {
                erase();
        }

 private:
        T* buf;
        uint_least32_t bufLen;
        T dummy;

        void kill(void)
        {
                buf = 0;
                bufLen = 0;
        }
        
 private:       // prevent copying
        // SAW - Need function body so code can be fully instatiated
        // for exporting from dll.  Use asserts in debug mode as these
        // should not be used.
        Buffer_sidtt(const Buffer_sidtt&) : dummy (0) { assert(0); }
        Buffer_sidtt& operator=(Buffer_sidtt& b)
        {
                assert(0);
                return b;
        }
};

#endif  /* BUFFER_H */