E:/uas2/Server/Message.h

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/*
* This file is part of UAS2.
*
* UAS2 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.
*
* UAS2 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 UASv1; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef __MESSAGE_H
#define __MESSAGE_H

#include <deque>
#include <vector>
#include <cassert>

#include "Shared.h"

#define BUFFER_BLOCK_SIZE 1024

class cMessage
{
        class cBlock
        {
                friend class cMessage;

                mutable BYTE *m_pStart, *m_pUsed;
        
        public:
                
                cBlock ();
                cBlock ( const cBlock &from );
                ~cBlock ();

                BOOL pasteData ( BYTE *&pData, int &nBytes );
                int getAlign ( int nBoundary ) const;
                BOOL pasteAlign ( int &nBytes );

                size_t getUsed () const
                {
                        return ( m_pUsed - m_pStart );
                }

                BOOL getData ( size_t &nOffset, size_t &nLength, BYTE * &pBuffer ) const;

        private:
                // Disabled functions
                cBlock &operator= ( const cBlock & );
        };

        typedef std::deque< cBlock > cBlockList;
        cBlockList m_blocks;

        // Place a block of data into the message
public:
        cMessage ();
        cMessage (BYTE* pbPacket, int nSize);
        ~cMessage( )
        { 
                while ( !m_blocks.empty( ) )
                        m_blocks.pop_front( );
        }

        // Basic functions for inserting data
        void pasteData ( BYTE *pData, int nBytes );
        void pasteAlign ( int nBoundary );
        void pasteString ( const char *str );

        // Functions for retrieving data
        size_t getSize () const;
        void getData ( size_t nOffset, size_t nLength, BYTE *pBuffer ) const;

        template< class DataT >
        inline void paste ( DataT dt )
        {
                pasteData ( reinterpret_cast< BYTE * > ( &dt ), sizeof ( DataT ) );
        }

        // String pastes
        template<>
        inline void paste ( char *str )
        {
                pasteString ( static_cast< const char * >( str ) ); 
        }

        template<>
        inline void paste ( const char *str )
        {
                pasteString ( static_cast< const char * >( str ) ); 
        }
 
        // Collection pastes
        template< class ItemT >
        void paste ( std::vector< ItemT > &vec )
        {
                for ( std::vector< ItemT >::iterator i = vec.begin(); i != vec.end(); ++ i )
                        i->encode ( *this );

                // Always realign after doing a vector
                pasteAlign ( sizeof ( unsigned long ) );
        }

        void CannedData( BYTE *pbData, DWORD dwSize )
        {
                pasteData( pbData, dwSize );
        }

        inline BYTE& operator[]( int iElem ) const 
        { 
//      #ifdef _DEBUG 
//              if ( getSize( ) > 0 ) 
//                      assert( iElem < getSize( ) );
//      #endif
                return (m_blocks.begin( ) + (iElem / BUFFER_BLOCK_SIZE))->m_pStart[iElem % BUFFER_BLOCK_SIZE];
        }

private:
        class cBlockDispenser
        {
                HANDLE m_hHeap;

        public:
                cBlockDispenser ();
                ~cBlockDispenser ();

                BYTE *get ();
                void release (BYTE *pBlock);
        };

        static cBlockDispenser g_dispenser;

        friend cBlock;
};

template< class DataT >
cMessage &operator<< ( cMessage &buf, DataT t )
{
   buf.paste ( t );
   return buf;
}

#endif  // #ifndef __MESSAGE_H

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