casynnet.cpp

linux下的一款播放器

    m_ClientHandlesMap = new CHXMapPtrToPtr;
    m_ClientSocketsMap = new CHXMapPtrToPtr;

    m_ulSession = CAsyncSockN::GetSession();

    m_bValid = Create();
}

//	Workhorse construction method
BOOL CAsyncSockN::Create()
{
    char szClassName[MAX_WND_CLASS_LENGTH]; /* Flawfinder: ignore */
    SafeSprintf(szClassName, MAX_WND_CLASS_LENGTH, "%s%d", WND_CLASS_BASE, &zm_bClassRegistered);

    if (!zm_bClassRegistered)
    {
	WNDCLASS internalClass;
    
	//	First register our window class                                  
	internalClass.style 		= 0;
	internalClass.lpfnWndProc 	= CAsyncSockN::AsyncNotifyProc;
	internalClass.cbClsExtra	= 0;
	internalClass.cbWndExtra	= sizeof(this);
	internalClass.hInstance		= m_hInst; // Use app's instance
	internalClass.hIcon		= 0;
	internalClass.hCursor		= 0;
	internalClass.hbrBackground	= 0;
	internalClass.lpszMenuName	= NULL;
	internalClass.lpszClassName	= szClassName;
	
	zm_bClassRegistered = RegisterClass(&internalClass);
	
	if(!zm_bClassRegistered)
	{
	    UnregisterClass(szClassName, m_hInst);
	    zm_bClassRegistered = RegisterClass(&internalClass);
	}
    }

    //	Now create an instance of the window	
    m_hWnd = CreateWindow(szClassName, "RealAudio Internal Messages", 
		WS_OVERLAPPED, 0, 0, 0, 0, NULL, NULL, m_hInst, this);
 
    if (!m_hWnd)
    {
	return (FALSE);
    }

    return (TRUE);
}

//	Destructor: Destroys the window and unregisters the class if necessary
CAsyncSockN::~CAsyncSockN()
{
    //	Validate input
    HX_ASSERT(this);
    if (!this)
    {
	return;
    }

    m_bValid = FALSE;
    // UnlinkUs( this );	
    m_hWnd = NULL;
    m_hInst = NULL;

    if(m_ClientHandlesMap)
    {
	delete m_ClientHandlesMap;
	m_ClientHandlesMap = NULL;
	m_cbNumHandlesClients = 0;
    }

    if(m_ClientSocketsMap)
    {
	delete m_ClientSocketsMap;
	m_ClientSocketsMap = NULL;
	m_cbNumSocketsClients = 0;
    }
}

//	This is the WndProc that handles async notifications on behalf of the client
//	win_net objects.
LRESULT HXEXPORT CAsyncSockN::AsyncNotifyProc(HWND hWnd, UINT msg, 
					      WPARAM wParam, LPARAM lParam)
{
    CAsyncSockN*    pThis = 0;


    //	Make ourselves look like a non-static member function dig the this
    //	pointer out of the window.
    if (msg == WM_NCCREATE)
    {
	CREATESTRUCT* lpCreate = 0;

	// Set our this pointer, so our WndProc can find us again
	lpCreate = (CREATESTRUCT FAR*) lParam;
	pThis = (CAsyncSockN*) lpCreate->lpCreateParams;
	SetWindowLong(hWnd, OFFSET_THIS, (long) pThis);
    }
    else if (msg == WM_NCDESTROY)
    {
	// remove our this pointer so if somebody calls this function
	// again after the window is gone (and the object is gone
	// too) we don't try to call a method from the pointer
	SetWindowLong(hWnd, OFFSET_THIS, 0L);
    }
    else
    {
	//	Note:	This MUST be a static function
	//	However we make it appear to be a member function
	//	By imbedding a this pointer in the window object
	pThis = (CAsyncSockN*) (LPHANDLE)GetWindowLong(hWnd, OFFSET_THIS);
    }

    if (pThis != NULL)
    {
	switch (msg)
	{
	    case PWM_ASYNC_SELECT:
		return (pThis->OnAsyncSelect(wParam, lParam));

	    case PWM_ASYNC_DNS:
		return (pThis->OnAsyncDNS(wParam, lParam));

	    default:
		break;
	}
    }

    return (DefWindowProc(hWnd, msg, wParam, lParam));
}

LRESULT CAsyncSockN::CheckClients()
{
    ProcessDNSQueue();
        
    if (!m_bInCancelMode && !m_cbNumHandlesClients && !m_cbNumSocketsClients)
    {
	UnlinkUs(this);
	DestroyWindow(m_hWnd);
	delete this;
    }

    return(TRUE);
}

//	Message handler for PWM_ASYNC_DNS
//	Notifies the client win_net object that DNS has completed or
//	returned w/ an error.
LRESULT CAsyncSockN::OnAsyncDNS(WPARAM wParam, LPARAM lParam)
{
    void*	    handle	= (void*) (HANDLE) wParam;
    void*	    pVoid	= 0;
    win_net*	    pClient	= 0;
    DNS_REQUEST*    pDNSRequest	= NULL;

    // Bail if the client map has been previously deleted, this
    // is a sure sign of us already being cleaned up!
    if(!m_ClientHandlesMap)
    {
	return(TRUE);
    }

    DEBUGOUTSTR( "AsyncDNS come back\r\n" );

    // Based on the handle returned, find our client!
    // Note it might be missing from the map if we canceled
    // the DNS!
    if (m_ClientHandlesMap->Lookup(handle, pVoid))
    {
	*((ULONG32 *)&pClient) = (ULONG32)pVoid;

	// We should already have an async operation active on this socket!
#ifdef _DEBUG
	if ((void *)pClient->m_hAsyncHandle != handle)
	{
	    char szMessage[256]; /* Flawfinder: ignore */
	    sprintf(szMessage,"pClient->m_hAsyncHandle = %#lx\nhandle = %#lx", /* Flawfinder: ignore */
				pClient->m_hAsyncHandle,
				handle
			    );
	    MessageBox(NULL,szMessage,"Oops!",MB_OK);
	}
	HX_ASSERT((void *)pClient->m_hAsyncHandle == handle);
#endif

	// Tell win_net object to forget the Async handle
	pClient->m_hAsyncHandle = NULL;

	pClient->CB_DNSComplete(!WSAGETASYNCERROR(lParam));

	// If async DNS is done, then we can forget the Async handle
	if (m_ClientHandlesMap->RemoveKey(handle))
	{
	    DecrementHandlesClientCount();
	}
    }

#ifdef _DEBUG
    if (m_ClientHandlesMap->GetCount() != m_cbNumHandlesClients)
    {
	char szMessage[256]; /* Flawfinder: ignore */
	sprintf(szMessage,"m_ClientHandlesMap->GetCount() = %d\nm_cbNumHandlesClients = %d", /* Flawfinder: ignore */
			    m_ClientHandlesMap->GetCount(),
			    m_cbNumHandlesClients
			);
	MessageBox(NULL,szMessage,"Oops!",MB_OK);
    }
    HX_ASSERT(m_ClientHandlesMap->GetCount() == m_cbNumHandlesClients);
#endif

    if (sockGlobals.m_bWinSock2Suck)
    {
	pDNSRequest = (DNS_REQUEST*) sockGlobals.m_DNSQueue.RemoveHead();
	HX_DELETE(pDNSRequest);
    }

    // check to see if we are still in use.
    CheckClients();
    return (TRUE);
}

//	Message handler for PWM_ASYNC_SELECT
//	Notifies the win_net client when the corresponding socket
//	is ready to read/write/ or has connected.
LRESULT CAsyncSockN::OnAsyncSelect(WPARAM wParam, LPARAM lParam)
{
    LPVOID		pVoid;
    UINT16		theEvent;
    UINT16		theError;
    SOCKET		theSocket;
    win_net*		pClient = NULL;

    theSocket = (SOCKET) wParam;
    theEvent = WSAGETSELECTEVENT(lParam);
    theError = WSAGETSELECTERROR(lParam);

    //	Find out the win_net object we want to talk to
    if(m_ClientSocketsMap->Lookup((void*) theSocket, pVoid))
    {
	*((ULONG32 *)&pClient) = (ULONG32) pVoid;
    }

    if (!pClient)
    {
	DEBUGOUTSTR( "Error OnAsyncSelect() no win_net object found\r\n" );
	return(TRUE);
    }

    if (theError)
    {
	char	acError[100]; /* Flawfinder: ignore */

	wsprintf(acError, "Got error %d from Winsock\r\n", theError);
	DEBUGOUTSTR(acError);
    }

    switch (theEvent)
    {
    case FD_WRITE:
	DEBUGOUTSTR("Got AsyncWrite notification\r\n");
	pClient->CB_ReadWriteNotification(theEvent);
	break;

    case FD_READ:
#ifndef _DEMPSEY
	// Noisy debug output
	DEBUGOUTSTR("Got AsyncRead notification\r\n");
#endif // _DEMPSEY
	pClient->CB_ReadWriteNotification(theEvent);
	break;

    case FD_CONNECT:
	DEBUGOUTSTR("Got AsyncConnect notification\r\n");
	pClient->CB_ConnectionComplete(!theError);
	break;

    case FD_CLOSE:
	DEBUGOUTSTR("Got AsyncClose notification\r\n");
	pClient->CB_CloseNotification();
	break;
    
    case FD_ACCEPT:
	DEBUGOUTSTR("Got AsyncAccept notification\r\n");
	pClient->CB_AcceptNotification();
	break;
    }

    return (TRUE);
}

//	Static method
//	Inserts us at the head of the list
void CAsyncSockN::LinkUs(CAsyncSockN* pUs)
{
    HX_ASSERT(pUs);

    if (!pUs)
    {
	return;
    }
    //	Tack us on at the head of the list since order doesn't matter
    pUs->m_pNextNotifier = zm_pSockNotifiers;
    zm_pSockNotifiers = pUs;
}

//	Static method
//	Removes us from the list
void CAsyncSockN::UnlinkUs(CAsyncSockN* pUs)
{
    CAsyncSockN* pWalk = 0;

    HX_ASSERT(pUs);

    //	Don't try to remove NULL pointers
    if (!pUs)
    {
	return;
    }

    //	If the desired node is at the head then it's simple
    if (zm_pSockNotifiers == pUs)
    {
	zm_pSockNotifiers = pUs->m_pNextNotifier;
	return;
    }
    //	Otherwise we have to walk the list till we find our node
    else
    {
	//	iterate till we find ourselves or reach the end of the list
	pWalk = zm_pSockNotifiers;
	while (pWalk && (pWalk->m_pNextNotifier != pUs))
	{
	    pWalk = pWalk->m_pNextNotifier;
	}
	//	Did we find ourselves?
	if (pWalk)
	{
	    //	Ok, link to our successor
	    pWalk->m_pNextNotifier = pUs->m_pNextNotifier;
	}
    }

    return;
}

//	Static method
//	Returns correct notifier object for our current session (thread/task)
CAsyncSockN *CAsyncSockN::FindSockNotifier()
{
    ULONG32	    ulSession;
    CAsyncSockN*    pWalk;

    ulSession = CAsyncSockN::GetSession();
    pWalk = CAsyncSockN::zm_pSockNotifiers;

    while (pWalk && pWalk->m_ulSession != ulSession)
    {
	pWalk = pWalk->m_pNextNotifier;
    }
    
    return (pWalk);
}

DNS_REQUEST::DNS_REQUEST()
{
    fpSock = NULL;
    lpHostName = NULL;
    lpBuffer = NULL;
    cbBufferSize = 0;
}

DNS_REQUEST::~DNS_REQUEST()
{
    HX_VECTOR_DELETE(lpHostName);
}

SockGlobals::SockGlobals()
{
}

SockGlobals::~SockGlobals()
{
    while (m_DNSQueue.GetCount())
    {
	DNS_REQUEST* pDNSRequest = (DNS_REQUEST*) m_DNSQueue.RemoveHead();
	HX_DELETE(pDNSRequest);
    }
    m_DNSQueue.RemoveAll();
}