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All rights in the Program not expressly granted under this Agreement are reserved. **  This Agreement is governed by the laws of the State of New York and the intellectual property laws of the United States of America. No party to this Agreement will bring a*  legal action under this Agreement more than one year after the cause of action arose. Each party waives its rights to a jury trial in any resulting litigation. **********************************************************************************************************************//* This class simulates the L2CAP SAR, protocol multiplexing andsignaling functions. Signaling is limited to sending and receiving connection request and response */#include "bt-core.h"int hdr_l2cap::offset_;static class L2CAPHeaderClass : public PacketHeaderClass {public:	L2CAPHeaderClass() : PacketHeaderClass("PacketHeader/L2CAP", sizeof(hdr_l2cap)) {		bind_offset(&hdr_l2cap::offset_);	}} class_l2caphdr;static class L2CAPClass : public TclClass {public:	L2CAPClass() : TclClass("L2CAP"){}	TclObject* create( int, const char*const*) {	 	return ( new L2CAP );	}} class_l2cap;L2CAP::L2CAP() : cid_(1), identifier_(0){	for (int i=0; i<7; i++) {		callback_[i] = 0;		packetType_[i] = BT_NULL;		}	write_reqQ_ = new queue<WriteReq*>[7];	cid_list_vec_  = new list<CID_attr*>[7];}// primitive for connection establishmentvoidL2CAP::L2CA_ConnectReq (uchar psm, uchar connection_handle, bt_packet_type packet_type){	cid_ = (cid_+1)%MaxCID;								      // initialize cid_ = 1	packetType_[connection_handle] = packet_type;	sendL2CAP_ConnectRequest(connection_handle, cid_, ++identifier_, psm);}// Receive a packet from the lower layervoidL2CAP::sendUp (Packet* p, Handler* h){	hdr_bt* bt = HDR_BT(p);	hdr_cmn* ch = HDR_CMN(p);	hdr_l2cap* l2cap = HDR_L2CAP(p);	uchar connection_handle = bt->am_addr -1;	uchar psm, rcid, scid, result; 	uchar* data = p->accessdata();	CID_attr* cid_attr;	BTHost* bthost;	if (l2cap->cid == 0x01) {		// Handle signaling packet		L2cmd l2cmd = l2cap->cmd; 			switch (l2cmd.code) {		    // Receive L2CAP_ConnectReq		    case (0x02) : 			printf("RECV L2CAP_CONNECT_REQ\t CH: %d\n", connection_handle);			psm = data[0];			rcid = data[1];			cid_attr = new CID_attr();			cid_attr->lcid = ++cid_;			cid_attr->rcid = rcid;			cid_attr->psm = psm;			cid_attr->ch = connection_handle;			cid_attr->state = W4_L2CA_ConnectRsp;			cid_attr->identifier = l2cmd.identifier;			bthost = (BTHost*)uptarget_;			bthost->L2CA_ConnectInd(cid_attr, psm);			break;		    // Receive L2CAP_ConnectRsp		    case (0x03) :			printf("RECV L2CAP_CONNECT_RSP\t CH: %d\n", connection_handle);			scid = data[0];			rcid = data[1];			result = data[2];			cid_attr = findCID(scid, connection_handle);			if(cid_attr)  // 避免空指針錯誤			{				cid_attr->rcid = rcid;				cid_attr->ch = connection_handle;				cid_attr->state = OPEN;				bthost = (BTHost*)uptarget_;				bthost->L2CA_ConnectCfm(cid_attr->lcid, connection_handle, cid_attr->psm);			}			break;		    		}		Packet::free(p);		return;	}	/* Data packet received */	/* Find cid structure for the channel */	CID_attr* cid = findCID(l2cap->cid, connection_handle);	//invalid CID	if (!cid) {		Packet::free(p);		return;	}	// valid CID	// Start of new L2CAP packet	if (bt->ph.l_ch == 0x0a) {