service_table.c

Upnp开发包文件

    service_info *head = NULL;
    service_info *current = NULL;
    service_info *previous = NULL;
    IXML_NodeList *serviceNodeList = NULL;
    int NumOfServices = 0;
    int i = 0;
    int fail = 0;

    if( getSubElement( "UDN", node, &UDN ) &&
        getSubElement( "serviceList", node, &serviceList ) ) {

        serviceNodeList = ixmlElement_getElementsByTagName( ( IXML_Element
                                                              * )
                                                            serviceList,
                                                            "service" );

        if( serviceNodeList != NULL ) {
            NumOfServices = ixmlNodeList_length( serviceNodeList );
            for( i = 0; i < NumOfServices; i++ ) {
                current_service = ixmlNodeList_item( serviceNodeList, i );
                fail = 0;

                if( current ) {
                    current->next =
                        ( service_info * )
                        malloc( sizeof( service_info ) );

                    previous = current;
                    current = current->next;
                } else {
                    head =
                        ( service_info * )
                        malloc( sizeof( service_info ) );
                    current = head;
                }

                if( !current ) {
                    freeServiceList( head );
                    return NULL;
                }

                current->next = NULL;
                current->controlURL = NULL;
                current->eventURL = NULL;
                current->serviceType = NULL;
                current->serviceId = NULL;
                current->SCPDURL = NULL;
                current->active = 1;
                current->subscriptionList = NULL;
                current->TotalSubscriptions = 0;

                if( !( current->UDN = getElementValue( UDN ) ) )
                    fail = 1;

                if( ( !getSubElement( "serviceType", current_service,
                                      &serviceType ) ) ||
                    ( !( current->serviceType =
                         getElementValue( serviceType ) ) ) )
                    fail = 1;

                if( ( !getSubElement( "serviceId", current_service,
                                      &serviceId ) ) ||
                    ( !
                      ( current->serviceId =
                        getElementValue( serviceId ) ) ) )
                    fail = 1;

                if( ( !
                      ( getSubElement
                        ( "SCPDURL", current_service, &SCPDURL ) ) )
                    || ( !( tempDOMString = getElementValue( SCPDURL ) ) )
                    ||
                    ( !
                      ( current->SCPDURL =
                        resolve_rel_url( URLBase, tempDOMString ) ) ) )
                    fail = 1;

                ixmlFreeDOMString( tempDOMString );
                tempDOMString = NULL;

                if( ( !
                      ( getSubElement
                        ( "controlURL", current_service, &controlURL ) ) )
                    ||
                    ( !( tempDOMString = getElementValue( controlURL ) ) )
                    ||
                    ( !
                      ( current->controlURL =
                        resolve_rel_url( URLBase, tempDOMString ) ) ) ) {
                    DBGONLY( UpnpPrintf
                             ( UPNP_INFO, GENA, __FILE__, __LINE__,
                               "BAD OR MISSING CONTROL URL" ) );
                    DBGONLY( UpnpPrintf
                             ( UPNP_INFO, GENA, __FILE__, __LINE__,
                               "CONTROL URL SET TO NULL IN SERVICE INFO" ) );
                    current->controlURL = NULL;
                    fail = 0;
                }

                ixmlFreeDOMString( tempDOMString );
                tempDOMString = NULL;

                if( ( !
                      ( getSubElement
                        ( "eventSubURL", current_service, &eventURL ) ) )
                    || ( !( tempDOMString = getElementValue( eventURL ) ) )
                    ||
                    ( !
                      ( current->eventURL =
                        resolve_rel_url( URLBase, tempDOMString ) ) ) ) {
                    DBGONLY( UpnpPrintf
                             ( UPNP_INFO, GENA, __FILE__, __LINE__,
                               "BAD OR MISSING EVENT URL" ) );
                    DBGONLY( UpnpPrintf
                             ( UPNP_INFO, GENA, __FILE__, __LINE__,
                               "EVENT URL SET TO NULL IN SERVICE INFO" ) );
                    current->eventURL = NULL;
                    fail = 0;
                }

                ixmlFreeDOMString( tempDOMString );
                tempDOMString = NULL;

                if( fail ) {
                    freeServiceList( current );

                    if( previous )
                        previous->next = NULL;
                    else
                        head = NULL;

                    current = previous;
                }

            }

            ixmlNodeList_free( serviceNodeList );
        }

        ( *end ) = current;

        return head;
    } else
        return NULL;

}

/************************************************************************
*	Function :	getAllServiceList
*
*	Parameters :
*		IXML_Node *node ;	XML node information
*		char * URLBase ;	provides Base URL to resolve relative URL 
*		service_info **out_end ; service added is returned to the output
*							parameter
*
*	Description :	Returns pointer to service info after getting the 
*		sub-elements of the service info. 
*
*	Return : service_info * ;
*
*	Note :
************************************************************************/
service_info *
getAllServiceList( IXML_Node * node,
                   char *URLBase,
                   service_info ** out_end )
{
    service_info *head = NULL;
    service_info *end = NULL;
    service_info *next_end = NULL;
    IXML_NodeList *deviceList = NULL;
    IXML_Node *currentDevice = NULL;

    int NumOfDevices = 0;
    int i = 0;

    ( *out_end ) = NULL;

    deviceList =
        ixmlElement_getElementsByTagName( ( IXML_Element * ) node,
                                          "device" );
    if( deviceList != NULL ) {
        NumOfDevices = ixmlNodeList_length( deviceList );
        for( i = 0; i < NumOfDevices; i++ ) {
            currentDevice = ixmlNodeList_item( deviceList, i );
            if( head ) {
                end->next =
                    getServiceList( currentDevice, &next_end, URLBase );
                end = next_end;
            } else
                head = getServiceList( currentDevice, &end, URLBase );

        }

        ixmlNodeList_free( deviceList );
    }

    ( *out_end ) = end;
    return head;
}

/************************************************************************
*	Function :	removeServiceTable
*
*	Parameters :
*		IXML_Node *node ;	XML node information
*		service_table *in ;	service table from which services will be 
*							removed
*
*	Description :	This function assumes that services for a particular 
*		root device are placed linearly in the service table, and in the 
*		order in which they are found in the description document
*		all services for this root device are removed from the list
*
*	Return : int ;
*
*	Note :
************************************************************************/
int
removeServiceTable( IXML_Node * node,
                    service_table * in )
{
    IXML_Node *root = NULL;
    IXML_Node *currentUDN = NULL;
    DOMString UDN = NULL;
    IXML_NodeList *deviceList = NULL;
    IXML_Node *currentDevice = NULL;
    service_info *current_service = NULL;
    service_info *start_search = NULL;
    service_info *prev_service = NULL;
    int NumOfDevices = 0;
    int i = 0;

    if( getSubElement( "root", node, &root ) ) {
        current_service = in->serviceList;
        start_search = in->serviceList;
        deviceList =
            ixmlElement_getElementsByTagName( ( IXML_Element * ) root,
                                              "device" );
        if( deviceList != NULL ) {
            NumOfDevices = ixmlNodeList_length( deviceList );
            for( i = 0; i < NumOfDevices; i++ ) {
                currentDevice = ixmlNodeList_item( deviceList, i );
                if( ( start_search )
                    && ( ( getSubElement( "UDN", node, &currentUDN ) )
                         && ( UDN = getElementValue( currentUDN ) ) ) ) {
                    current_service = start_search;
                    //Services are put in the service table in the order in which they appear in the 
                    //description document, therefore we go through the list only once to remove a particular
                    //root device
                    while( ( current_service )
                           && ( strcmp( current_service->UDN, UDN ) ) ) {
                        current_service = current_service->next;
                        prev_service = current_service->next;
                    }
                    while( ( current_service )
                           && ( !strcmp( current_service->UDN, UDN ) ) ) {
                        if( prev_service ) {
                            prev_service->next = current_service->next;
                        } else {
                            in->serviceList = current_service->next;
                        }
                        if( current_service == in->endServiceList )
                            in->endServiceList = prev_service;
                        start_search = current_service->next;
                        freeService( current_service );
                        current_service = start_search;
                    }
                }
            }

            ixmlNodeList_free( deviceList );
        }
    }
    return 1;
}

/************************************************************************
*	Function :	addServiceTable
*
*	Parameters :
*		IXML_Node *node ;	XML node information 
*		service_table *in ;	service table that will be initialized with 
*							services
*		const char *DefaultURLBase ; Default base URL on which the URL 
*							will be returned to the service list.
*
*	Description :	Add Service to the table.
*
*	Return : int ;
*
*	Note :
************************************************************************/
int
addServiceTable( IXML_Node * node,
                 service_table * in,
                 const char *DefaultURLBase )
{
    IXML_Node *root = NULL;
    IXML_Node *URLBase = NULL;

    service_info *tempEnd = NULL;

    if( in->URLBase ) {
        free( in->URLBase );
        in->URLBase = NULL;
    }

    if( getSubElement( "root", node, &root ) ) {
        if( getSubElement( "URLBase", root, &URLBase ) ) {
            in->URLBase = getElementValue( URLBase );
        } else {
            if( DefaultURLBase ) {
                in->URLBase = ixmlCloneDOMString( DefaultURLBase );
            } else {
                in->URLBase = ixmlCloneDOMString( "" );
            }
        }

        if( ( in->endServiceList->next =
              getAllServiceList( root, in->URLBase, &tempEnd ) ) ) {
            in->endServiceList = tempEnd;
            return 1;
        }

    }

    return 0;
}

/************************************************************************
*	Function :	getServiceTable
*
*	Parameters :
*		IXML_Node *node ;	XML node information
*		service_table *out ;	output parameter which will contain the 
*							service list and URL 
*		const char *DefaultURLBase ; Default base URL on which the URL 
*							will be returned.
*
*	Description :	Retrieve service from the table
*
*	Return : int ;
*
*	Note :
************************************************************************/
int
getServiceTable( IXML_Node * node,
                 service_table * out,
                 const char *DefaultURLBase )
{
    IXML_Node *root = NULL;
    IXML_Node *URLBase = NULL;

    if( getSubElement( "root", node, &root ) ) {
        if( getSubElement( "URLBase", root, &URLBase ) ) {
            out->URLBase = getElementValue( URLBase );
        } else {
            if( DefaultURLBase ) {
                out->URLBase = ixmlCloneDOMString( DefaultURLBase );
            } else {
                out->URLBase = ixmlCloneDOMString( "" );
            }
        }

        if( ( out->serviceList = getAllServiceList( root, out->URLBase,
                                                    &out->
                                                    endServiceList ) ) ) {
            return 1;
        }

    }

    return 0;
}

#endif // INCLUDE_DEVICE_APIS