RandomAccessStream.h

/*
 *  $Id$
 *  RandomAccessStream class interface
 *
 *  This file is part of OTAWA
 *  Copyright (c) 2008, IRIT UPS.
 * 
 *  OTAWA 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.
 *
 *  OTAWA 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 OTAWA; if not, write to the Free Software 
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef ELM_IO_RANDOMACCESSSTREAM_H_
#define ELM_IO_RANDOMACCESSSTREAM_H_
 
#include <elm/types.h>
#include <elm/io/InStream.h>
#include <elm/io/OutStream.h>
#include <elm/sys/Path.h>
#include <elm/sys/SystemException.h>
 
namespace elm { namespace io {
 
// RandomAccessStream class
class RandomAccessStream: public InStream, public OutStream  {
public:
    typedef t::uint64 pos_t;
    typedef t::uint64 size_t;
    typedef int access_t;
    static const int READ = 1;
    static const int WRITE = 2;
    static const int READ_WRITE = READ | WRITE; 
    
    virtual pos_t pos(void) const = 0;
    virtual size_t size(void) const = 0; 
    virtual bool moveTo(pos_t pos) = 0;
    virtual bool moveForward(pos_t pos) = 0;
    virtual bool moveBackward(pos_t pos) = 0;
    virtual void resetPos(void) { moveTo(0); }
    static RandomAccessStream *openFile(const sys::Path& path,
        access_t access = READ);
    static RandomAccessStream *createFile(const sys::Path& path,
        access_t access = WRITE);
};
 
} } // elm::io
 
#endif /*ELM_IO_RANDOMACCESSSTREAM_H_*/