IOBuffer.h

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/*
 * IOBuffer.h
 *
 * Smalltalk like class library for C++
 * Buffer for I/O accessors. Header.
 *
 * Copyright (c) 2003 Milan Cermak
 */
/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifndef __IOBUFFER_H
#define __IOBUFFER_H

#include <stlib/Object.h>

namespace Core {

class IOAccessor;
class ByteArray;

class IOBuffer : public Object
{
  protected:
    IOAccessor *io_accessor;
    ByteArray *_buffer;
    long buffer_amount;

  public:
    IOBuffer(IOAccessor *accessor);

    /* Class-accessing protocol */
    virtual String *className(void) const;

    /* Buffer accessing protocol */
    virtual ByteArray *buffer(void);

    /* Buffer state protocol */
    virtual void bufferChanged(void);

    /* Position accessing protocol */
    virtual long currentBufferPosition(void);
    virtual long firstDataPosition(void);
    virtual long lastDataPosition(void);
    virtual long lastWriteablePosition(void);

    /* Positioning protocol */
    virtual bool isSeekable(void);
    virtual ByteArray *readPositionAndSetOffset(long position, long &offset);

    /* Reading protocol */
    virtual ByteArray *nextAndSetOffset(long &offset);

    /* Status protocol */
    virtual void commit(void);

    /* Writing protocol */
    virtual void flushBufferUpTo(long position);

    /* Private protocol */
    virtual long readBufferStartingAt(long position);
    virtual void stepToNextBuffer(void);
};

};

#endif /* __IOBUFFER_H */

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