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FileInputStream

/*
 * NOTE: "zlib/libpng" style License
 *
 *                 ----=== s t d n e t ===----
 *
 * Copyright (c) 2002 Warwick Molloy   w-molloy@users.sf.net
 *
 * Copyright (c) 2002 Stdnet Community
 * HTTP://Sourceforge.net/projects/stdnet
 *
 * All references to "software" refer to the stdnet.
 *
 * This software is provided 'as-is', without any express or
 * implied warranty. In no event will the authors be held liable
 * for any damages arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any
 * purpose, including commercial applications, and to alter it
 * and redistribute it freely, subject to the following
 * restrictions:
 *
 * 1.  The origin of this software must not be misrepresented;
 *     you must not claim that you wrote the original software.
 *     If you use this software in a product, an acknowledgment
 *     in the product documentation would be appreciated but
 *     is not required.
 *
 * 2.  Altered source versions must be plainly marked as such,
 *     and must not be misrepresented as being the original
 *     software.
 *
 * 3.  This notice may not be removed or altered from any source
 *     distribution.
 */

#ifndef __io_FileInputStream__
#define __io_FileInputStream__

#include <stdnet/system/Abstract>
#include <stdnet/io/IOException>
#include <stdnet/io/InputStream>
#include <stdnet/system/Object>
#include <stdnet/config.h>

namespace stdbase {
    namespace io {

class FileInputStream :
    public system::Object,
    public InputStream
{
protected:
    FileInputStream( ::stdbase::system::StringRef name);

    FileInputStream( const ::stdbase::system::platform::FileDescriptor &fd);

    virtual ~FileInputStream();

public:
    static system::reference< FileInputStream >
        create( system::StringRef name );
    
    static system::reference< FileInputStream >
        create( const system::platform::FileDescriptor & fd);
    
    virtual int
        available() throw (IOException);
    
    virtual void
        close() throw (IOException);

    virtual void
        mark( int readlimit);

    virtual void
        reset() throw (IOException);

    virtual bool
        markSupported();

    virtual int
        read( byte buffer[], int len) throw (IOException);
        
    virtual int
        read() throw (IOException);

    virtual long
        skip( long n ) throw (IOException);

private:
    enum { DATA_BUFFER_SIZE = 512 };

    system::platform::FileDescriptor  input;

    byte            data_buffer[ DATA_BUFFER_SIZE ];
    int             position;
    int             length;
};

typedef system::reference< FileInputStream >    FileInputStreamRef;

    } // -- end io --
} // -- end stdbase --

#endif  //  __io_FileInputStream__

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