BTPacket.cpp

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//
// BTPacket.cpp
//
// Copyright (c) Shareaza Development Team, 2002-2005.
// This file is part of SHAREAZA (www.shareaza.com)
//
// Shareaza 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.
//
// Shareaza 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 Shareaza; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//

#include "StdAfx.h"
#include "Shareaza.h"
#include "BTPacket.h"
#include "Buffer.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

CBTPacket::CBTPacketPool CBTPacket::POOL;


// CBTPacket construction

CBTPacket::CBTPacket() : CPacket( PROTOCOL_BT )
{
        m_nType = 0;
}

CBTPacket::~CBTPacket()
{
}

// CBTPacket serialize

void CBTPacket::ToBuffer(CBuffer* pBuffer) const
{
        ASSERT( pBuffer != NULL );

        if ( m_nType == BT_PACKET_KEEPALIVE )
        {
                DWORD nZero = 0;
                pBuffer->Add( &nZero, 4 );
        }
        else
        {
                DWORD nLength = SWAP_LONG( m_nLength + 1 );
                pBuffer->Add( &nLength, 4 );
                pBuffer->Add( &m_nType, 1 );
                pBuffer->Add( m_pBuffer, m_nLength );
        }
}

// CBTPacket unserialize

CBTPacket* CBTPacket::ReadBuffer(CBuffer* pBuffer)
{
        ASSERT( pBuffer != NULL );
        if ( pBuffer->m_nLength < 4 ) return NULL;

        DWORD nLength = *(DWORD*)pBuffer->m_pBuffer;
        nLength = SWAP_LONG( nLength );
        if ( pBuffer->m_nLength < 4 + nLength ) return NULL;

        if ( nLength == 0 )
        {
                pBuffer->Remove( 4 );
                return CBTPacket::New( BT_PACKET_KEEPALIVE );
        }

        CBTPacket* pPacket = CBTPacket::New( pBuffer->m_pBuffer[4] );
        pPacket->Write( pBuffer->m_pBuffer + 5, nLength - 1 );

        pBuffer->Remove( 4 + nLength );
        return pPacket;
}

// CBTPacket debugging

LPCTSTR CBTPacket::GetType() const
{
        static TCHAR szTypeBuffer[16];
        _stprintf( szTypeBuffer, _T("%i"), int( m_nType ) );
        return szTypeBuffer;
}

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