#ifdef _WIN32
    namespace win{
        #include <windows.h>
        #include <intrin.h>
        #include <iphlpapi.h>
        #include <stdio.h>
        #include <stdlib.h>
        #pragma comment(lib, "IPHLPAPI.lib")


        // we just need this for purposes of unique machine id. So any one or two mac's is
        // fine.
        unsigned short hashMacAddress( PIP_ADAPTER_INFO info )
        {
            unsigned short hash = 0;
            for ( unsigned int i = 0; i < info->AddressLength; i++ )
            {
                hash += ( info->Address[i] << (( i & 1 ) * 8 ));
            }
            return hash;
        }

        void getMacHash( unsigned short& mac1, unsigned short& mac2 )
        {
            IP_ADAPTER_INFO AdapterInfo[32];
            ULONG dwBufLen = sizeof( AdapterInfo );

            ULONG dwStatus = GetAdaptersInfo( AdapterInfo, &dwBufLen );
            if ( dwStatus != ERROR_SUCCESS )
                return; // no adapters.

            PIP_ADAPTER_INFO pAdapterInfo = AdapterInfo;
            mac1 = hashMacAddress( pAdapterInfo );
            if ( pAdapterInfo->Next )
                mac2 = hashMacAddress( pAdapterInfo->Next );

            // sort the mac addresses. We don't want to invalidate
            // both macs if they just change order.
            if ( mac1 > mac2 )
            {
                unsigned short tmp = mac2;
                mac2 = mac1;
                mac1 = tmp;
            }
        }

        unsigned short getVolumeHash()
        {
            DWORD serialNum = 0;

            // Determine if this volume uses an NTFS file system.
            GetVolumeInformation( "c:\\", NULL, 0, &serialNum, NULL, NULL, NULL, 0 );
            unsigned short hash = (unsigned short)(( serialNum + ( serialNum >> 16 )) & 0xFFFF );

            return hash;
        }

        unsigned short getCpuHash()
        {
            int cpuinfo[4] = { 0, 0, 0, 0 };
            __cpuid( cpuinfo, 0 );
            unsigned short hash = 0;
            unsigned short* ptr = (unsigned short*)(&cpuinfo[0]);
            for ( unsigned int i = 0; i < 8; i++ )
                hash += ptr[i];

            return hash;
        }

        const char* getMachineName()
        {
            static char computerName[1024];
            DWORD size = 1024;
            GetComputerName( computerName, &size );
            return &(computerName[0]);
        }

    }
#endif//_WIN32