bufferstream.h

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/***************************************************************************
 *   Copyright (C) 2004-2005 by Reality Rift Studios                       *
 *   http://www.realityrift.com  -  mattias@realityrift.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.                          *
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 *   You should have received a copy of the GNU General Public License     *
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 *   Free Software Foundation, Inc.,                                       *
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#ifndef neo_file_bufferstream_h
#define neo_file_bufferstream_h

#include "../core/platform.h"
#include "iostream.h"

namespace neo {
namespace file {

class BufferStreamBuf : public std::basic_streambuf< char >, public core::Noncopyable
{
    public:


                                                            BufferStreamBuf( unsigned char* p_buffer, unsigned int size, unsigned int mode );


    virtual                                                ~BufferStreamBuf();


    void                                                    truncate( int64_t length );


    const unsigned char*                                    getBuffer() const;


    unsigned int                                            getBufferSize() const;
    
    protected:

    typedef std::basic_streambuf< char >::pos_type          pos_type;
    typedef std::basic_streambuf< char >::off_type          off_type;
    typedef std::basic_streambuf< char >::int_type          int_type;
    typedef std::basic_streambuf< char >::traits_type       traits_type;

    unsigned char*                                          _p_buffer;

    unsigned int                                            _size;

    unsigned int                                            _storesize;

    unsigned int                                            _mode;


    virtual std::basic_streambuf< char >*                   setbuf( char* p_buffer, std::streamsize size );


    virtual pos_type                                        seekoff( off_type offset, std::ios_base::seekdir dir, std::ios_base::openmode mode );


    virtual pos_type                                        seekpos( pos_type position, std::ios_base::openmode mode );


    virtual int_type                                        underflow();


    virtual int_type                                        overflow( int_type c );

    friend class BufferStream;
};

class BufferStream : public IOStream
{
    public:


                                                            BufferStream( unsigned char* p_buffer = 0, unsigned int size = 0, unsigned int mode = ( IN | BINARY ) );


    virtual                                                ~BufferStream();


    virtual void                                            truncate( int64_t length );


    virtual void                                            determineBinaryMode( unsigned int num = 8 );


    const unsigned char*                                    getBuffer() const;

    virtual BufferStream*                                   clone() const;

    protected:

    BufferStreamBuf*                                        _p_buf;

    std::iostream*                                          _p_stream;
};

}
}

#endif

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