NS_IF_ADDREF(mInst);
memset(&mNPStream, 0, sizeof(mNPStream));
ns4xPluginStreamListener::ns4xPluginStreamListener(nsIPluginInstance* inst,                                                    void* notifyData,                                                   const char* aURL)    : mNotifyData(notifyData),      mStreamBuffer(nsnull),      mNotifyURL(nsnull),        mStreamStarted(PR_FALSE),      mStreamCleanedUp(PR_FALSE),      mCallNotify(PR_FALSE),            mStreamInfo(nsnull){  mInst = (ns4xPluginInstance*) inst;  mPosition = 0;  mStreamBufferSize = 0;  // Initialize the 4.x interface structure  memset(&mNPStream, 0, sizeof(mNPStream));  NS_IF_ADDREF(mInst);  if (aURL)    mNotifyURL = PL_strdup(aURL);}