Another instance of Signal info.

svn path=/trunk/; revision=26415

2 files changed, 61 insertions, 43 deletions

diff --git a/asn1/gsmmap/gsmmap.cnf b/asn1/gsmmap/gsmmap.cnf
index f6e8d9fb21..b295a796bc 100644
--- a/asn1/gsmmap/gsmmap.cnf
+++ b/asn1/gsmmap/gsmmap.cnf
@@ -243,12 +243,21 @@ MAP-DialoguePDU				B "0.4.0.0.1.1.1.1" "map-DialogueAS"
 	/* ts3G-48006 */
 	case 1:
 		octet = tvb_get_guint8(parameter_tvb,0);
-		length = tvb_get_guint8(parameter_tvb,1);
-		if ( octet == 0) {/* DISCRIMINATION TS 48 006 */
-			/* gsm-BSSMAP? */
+		/* Discrimination parameter */
+		proto_tree_add_item(subtree, hf_gsm_map_disc_par, parameter_tvb, 0,1,FALSE);
+		if ( octet == 0) {/* DISCRIMINATION TS 48 006(GSM 08.06 version 5.3.0) */
+			/* Strip off discrimination and length */
+			length = tvb_get_guint8(parameter_tvb,0);
+			proto_tree_add_item(subtree, hf_gsm_map_len, parameter_tvb, 1,1,FALSE);
 			next_tvb = tvb_new_subset(parameter_tvb, 2, -1, -1);
-			dissect_bssmap(next_tvb, actx->pinfo, tree);
-		}
+			dissect_bssmap(next_tvb, actx->pinfo, subtree);
+		}else if(octet==1){
+			proto_tree_add_item(subtree, hf_gsm_map_dlci, parameter_tvb, 1,1,FALSE);
+			proto_tree_add_item(subtree, hf_gsm_map_len, parameter_tvb, 2,1,FALSE);
+			length = tvb_get_guint8(parameter_tvb,0);
+			next_tvb = tvb_new_subset(parameter_tvb, 3, -1, -1);
+			call_dissector(dtap_handle, next_tvb, actx->pinfo, subtree); 
+		}	
 		break;
  	/* ts3G-25413 */
 	case 2:
diff --git a/epan/dissectors/packet-gsm_map.c b/epan/dissectors/packet-gsm_map.c
index 195a90fa48..bf27d6753d 100644
--- a/epan/dissectors/packet-gsm_map.c
+++ b/epan/dissectors/packet-gsm_map.c
@@ -2960,7 +2960,7 @@ dissect_gsm_map_ProtocolId(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int off
 
 static int
 dissect_gsm_map_SignalInfo(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 280 "gsmmap.cnf"
+#line 289 "gsmmap.cnf"
  tvbuff_t	*parameter_tvb;
 
    offset = dissect_ber_octet_string(implicit_tag, actx, tree, tvb, offset, hf_index,
@@ -2984,7 +2984,7 @@ static const ber_sequence_t gsm_map_ExternalSignalInfo_sequence[] = {
 
 static int
 dissect_gsm_map_ExternalSignalInfo(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 707 "gsmmap.cnf"
+#line 716 "gsmmap.cnf"
 /*
 -- Information about the internal structure is given in
 -- clause 7.6.9.
@@ -3145,12 +3145,21 @@ dissect_gsm_map_LongSignalInfo(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int
 	/* ts3G-48006 */
 	case 1:
 		octet = tvb_get_guint8(parameter_tvb,0);
-		length = tvb_get_guint8(parameter_tvb,1);
-		if ( octet == 0) {/* DISCRIMINATION TS 48 006 */
-			/* gsm-BSSMAP? */
+		/* Discrimination parameter */
+		proto_tree_add_item(subtree, hf_gsm_map_disc_par, parameter_tvb, 0,1,FALSE);
+		if ( octet == 0) {/* DISCRIMINATION TS 48 006(GSM 08.06 version 5.3.0) */
+			/* Strip off discrimination and length */
+			length = tvb_get_guint8(parameter_tvb,0);
+			proto_tree_add_item(subtree, hf_gsm_map_len, parameter_tvb, 1,1,FALSE);
 			next_tvb = tvb_new_subset(parameter_tvb, 2, -1, -1);
-			dissect_bssmap(next_tvb, actx->pinfo, tree);
-		}
+			dissect_bssmap(next_tvb, actx->pinfo, subtree);
+		}else if(octet==1){
+			proto_tree_add_item(subtree, hf_gsm_map_dlci, parameter_tvb, 1,1,FALSE);
+			proto_tree_add_item(subtree, hf_gsm_map_len, parameter_tvb, 2,1,FALSE);
+			length = tvb_get_guint8(parameter_tvb,0);
+			next_tvb = tvb_new_subset(parameter_tvb, 3, -1, -1);
+			call_dissector(dtap_handle, next_tvb, actx->pinfo, subtree); 
+		}	
 		break;
  	/* ts3G-25413 */
 	case 2:
@@ -3301,7 +3310,7 @@ dissect_gsm_map_HLR_List(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offse
 
 int
 dissect_gsm_map_GlobalCellId(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 788 "gsmmap.cnf"
+#line 797 "gsmmap.cnf"
     tvbuff_t	*parameter_tvb; 
 	proto_tree	*subtree;
 
@@ -3567,7 +3576,7 @@ dissect_gsm_map_CellGlobalIdOrServiceAreaIdFixedLength(gboolean implicit_tag _U_
 
 int
 dissect_gsm_map_LAIFixedLength(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 567 "gsmmap.cnf"
+#line 576 "gsmmap.cnf"
 
         tvbuff_t        *parameter_tvb; 
         proto_tree *subtree; 
@@ -3693,7 +3702,7 @@ dissect_gsm_map_EMLPP_Info(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int off
 
 static int
 dissect_gsm_map_Ext_SS_Status(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 378 "gsmmap.cnf"
+#line 387 "gsmmap.cnf"
  /* Note Ext-SS-Status can have more than one byte */
 
  tvbuff_t	*parameter_tvb;
@@ -3816,7 +3825,7 @@ dissect_gsm_map_ss_RegisterSS_Arg(gboolean implicit_tag _U_, tvbuff_t *tvb _U_,
 
 int
 dissect_gsm_map_ss_SS_Status(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 358 "gsmmap.cnf"
+#line 367 "gsmmap.cnf"
 
  tvbuff_t	*parameter_tvb;
  guint8		octet;
@@ -3850,7 +3859,7 @@ dissect_gsm_map_ss_ForwardingOptions(gboolean implicit_tag _U_, tvbuff_t *tvb _U
   offset = dissect_ber_octet_string(implicit_tag, actx, tree, tvb, offset, hf_index,
                                        NULL);
 
-#line 474 "gsmmap.cnf"
+#line 483 "gsmmap.cnf"
 
 	proto_tree_add_item(tree, hf_gsm_map_notification_to_forwarding_party, tvb, 0,1,FALSE);
 	proto_tree_add_item(tree, hf_gsm_map_redirecting_presentation, tvb, 0,1,FALSE);
@@ -4169,7 +4178,7 @@ dissect_gsm_map_ss_InterrogateSS_Res(gboolean implicit_tag _U_, tvbuff_t *tvb _U
 
 int
 dissect_gsm_map_ss_USSD_DataCodingScheme(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 401 "gsmmap.cnf"
+#line 410 "gsmmap.cnf"
  /*The structure of the USSD-DataCodingScheme is defined by
   * the Cell Broadcast Data Coding Scheme as described in
   * TS 3GPP TS 23.038
@@ -4195,7 +4204,7 @@ dissect_gsm_map_ss_USSD_DataCodingScheme(gboolean implicit_tag _U_, tvbuff_t *tv
 
 int
 dissect_gsm_map_ss_USSD_String(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 416 "gsmmap.cnf"
+#line 425 "gsmmap.cnf"
 
   tvbuff_t	*parameter_tvb;
   int			length;
@@ -4687,7 +4696,7 @@ static const ber_sequence_t gsm_map_er_SM_DeliveryFailureCause_sequence[] = {
 
 static int
 dissect_gsm_map_er_SM_DeliveryFailureCause(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 287 "gsmmap.cnf"
+#line 296 "gsmmap.cnf"
 	/* dissect_gsm_map_SignalInfo will return parameter_tvb in actx */
   offset = dissect_ber_sequence(implicit_tag, actx, tree, tvb, offset,
                                    gsm_map_er_SM_DeliveryFailureCause_sequence, hf_index, ett_gsm_map_er_SM_DeliveryFailureCause);
@@ -5579,7 +5588,7 @@ dissect_gsm_map_sm_SM_RP_DA(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int of
 
 static int
 dissect_gsm_map_sm_T_msisdn(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 276 "gsmmap.cnf"
+#line 285 "gsmmap.cnf"
 actx->pinfo->p2p_dir = P2P_DIR_RECV;
    offset = dissect_gsm_map_ISDN_AddressString(implicit_tag, tvb, offset, actx, tree, hf_index);
 
@@ -5593,7 +5602,7 @@ actx->pinfo->p2p_dir = P2P_DIR_RECV;
 
 static int
 dissect_gsm_map_sm_T_serviceCentreAddressOA(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 268 "gsmmap.cnf"
+#line 277 "gsmmap.cnf"
 	actx->pinfo->p2p_dir = P2P_DIR_SENT;
   offset = dissect_gsm_map_AddressString(implicit_tag, tvb, offset, actx, tree, hf_index);
 
@@ -5639,7 +5648,7 @@ static const ber_sequence_t gsm_map_sm_MO_ForwardSM_Arg_sequence[] = {
 
 static int
 dissect_gsm_map_sm_MO_ForwardSM_Arg(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 304 "gsmmap.cnf"
+#line 313 "gsmmap.cnf"
 
 	/* dissect_gsm_map_SignalInfo will return parameter_tvb in actx */
   offset = dissect_ber_sequence(implicit_tag, actx, tree, tvb, offset,
@@ -5664,7 +5673,7 @@ static const ber_sequence_t gsm_map_sm_MO_ForwardSM_Res_sequence[] = {
 
 static int
 dissect_gsm_map_sm_MO_ForwardSM_Res(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 313 "gsmmap.cnf"
+#line 322 "gsmmap.cnf"
 
         /* dissect_gsm_map_SignalInfo will return parameter_tvb in actx */
   offset = dissect_ber_sequence(implicit_tag, actx, tree, tvb, offset,
@@ -5692,7 +5701,7 @@ static const ber_sequence_t gsm_map_sm_MT_ForwardSM_Arg_sequence[] = {
 
 static int
 dissect_gsm_map_sm_MT_ForwardSM_Arg(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 322 "gsmmap.cnf"
+#line 331 "gsmmap.cnf"
 
 	/* dissect_gsm_map_SignalInfo will return parameter_tvb in actx */
   offset = dissect_ber_sequence(implicit_tag, actx, tree, tvb, offset,
@@ -5717,7 +5726,7 @@ static const ber_sequence_t gsm_map_sm_MT_ForwardSM_Res_sequence[] = {
 
 static int
 dissect_gsm_map_sm_MT_ForwardSM_Res(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 331 "gsmmap.cnf"
+#line 340 "gsmmap.cnf"
 
         /* dissect_gsm_map_SignalInfo will return parameter_tvb in actx */
   offset = dissect_ber_sequence(implicit_tag, actx, tree, tvb, offset,
@@ -5900,7 +5909,7 @@ static const ber_sequence_t gsm_map_sm_MT_ForwardSM_VGCS_Arg_sequence[] = {
 
 static int
 dissect_gsm_map_sm_MT_ForwardSM_VGCS_Arg(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 340 "gsmmap.cnf"
+#line 349 "gsmmap.cnf"
 
         /* dissect_gsm_map_SignalInfo will return parameter_tvb in actx */
   offset = dissect_ber_sequence(implicit_tag, actx, tree, tvb, offset,
@@ -5940,7 +5949,7 @@ static const ber_sequence_t gsm_map_sm_MT_ForwardSM_VGCS_Res_sequence[] = {
 
 static int
 dissect_gsm_map_sm_MT_ForwardSM_VGCS_Res(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 349 "gsmmap.cnf"
+#line 358 "gsmmap.cnf"
 
         /* dissect_gsm_map_SignalInfo will return parameter_tvb in actx */
   offset = dissect_ber_sequence(implicit_tag, actx, tree, tvb, offset,
@@ -6552,7 +6561,7 @@ dissect_gsm_map_ms_VLR_Capability(gboolean implicit_tag _U_, tvbuff_t *tvb _U_,
 
 int
 dissect_gsm_map_ms_GSN_Address(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 531 "gsmmap.cnf"
+#line 540 "gsmmap.cnf"
 
 	tvbuff_t	*parameter_tvb;
 	guint8		octet;
@@ -7187,7 +7196,7 @@ dissect_gsm_map_ms_UpdateGprsLocationRes(gboolean implicit_tag _U_, tvbuff_t *tv
 
 static int
 dissect_gsm_map_ms_IntegrityProtectionInformation(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 603 "gsmmap.cnf"
+#line 612 "gsmmap.cnf"
     tvbuff_t        *parameter_tvb;
 	asn1_ctx_t		asn1_ctx;
 
@@ -7210,7 +7219,7 @@ dissect_gsm_map_ms_IntegrityProtectionInformation(gboolean implicit_tag _U_, tvb
 
 static int
 dissect_gsm_map_ms_EncryptionInformation(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 615 "gsmmap.cnf"
+#line 624 "gsmmap.cnf"
     tvbuff_t        *parameter_tvb;
 	asn1_ctx_t		asn1_ctx;
 
@@ -7295,7 +7304,7 @@ dissect_gsm_map_ms_AllowedUMTS_Algorithms(gboolean implicit_tag _U_, tvbuff_t *t
 
 static int
 dissect_gsm_map_ms_RadioResourceInformation(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 579 "gsmmap.cnf"
+#line 588 "gsmmap.cnf"
     tvbuff_t        *parameter_tvb; 
 	proto_tree *subtree;
 
@@ -7366,7 +7375,7 @@ dissect_gsm_map_ms_BSSMAP_ServiceHandover(gboolean implicit_tag _U_, tvbuff_t *t
 
 static int
 dissect_gsm_map_ms_RANAP_ServiceHandover(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 591 "gsmmap.cnf"
+#line 600 "gsmmap.cnf"
     tvbuff_t        *parameter_tvb;
 	asn1_ctx_t		asn1_ctx;
 
@@ -8100,7 +8109,7 @@ static int
 dissect_gsm_map_ms_T_forwardingOptions(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
   offset = dissect_gsm_map_ms_Ext_ForwOptions(implicit_tag, tvb, offset, actx, tree, hf_index);
 
-#line 480 "gsmmap.cnf"
+#line 489 "gsmmap.cnf"
 
 	proto_tree_add_item(tree, hf_gsm_map_notification_to_forwarding_party, tvb, 0,1,FALSE);
 	proto_tree_add_item(tree, hf_gsm_map_redirecting_presentation, tvb, 0,1,FALSE);
@@ -9295,7 +9304,7 @@ dissect_gsm_map_ms_ContextId(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int o
 
 static int
 dissect_gsm_map_ms_PDP_Type(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 488 "gsmmap.cnf"
+#line 497 "gsmmap.cnf"
 	guint8 pdp_type_org;
 	tvbuff_t	*parameter_tvb;
 
@@ -9338,7 +9347,7 @@ dissect_gsm_map_ms_PDP_Address(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int
 
 int
 dissect_gsm_map_ms_QoS_Subscribed(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 510 "gsmmap.cnf"
+#line 519 "gsmmap.cnf"
 
 
 	tvbuff_t	*parameter_tvb;
@@ -9370,7 +9379,7 @@ dissect_gsm_map_ms_APN(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset
 
 int
 dissect_gsm_map_ms_Ext_QoS_Subscribed(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 521 "gsmmap.cnf"
+#line 530 "gsmmap.cnf"
 
 	tvbuff_t	*parameter_tvb;
 
@@ -10536,7 +10545,7 @@ dissect_gsm_map_ms_SubscriberState(gboolean implicit_tag _U_, tvbuff_t *tvb _U_,
 
 int
 dissect_gsm_map_ms_RAIdentity(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 555 "gsmmap.cnf"
+#line 564 "gsmmap.cnf"
 
 	tvbuff_t	*parameter_tvb;
 	proto_tree *subtree;
@@ -12848,7 +12857,7 @@ dissect_gsm_map_lcs_ProvideSubscriberLocation_Arg(gboolean implicit_tag _U_, tvb
 
 int
 dissect_gsm_map_lcs_Ext_GeographicalInformation(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 800 "gsmmap.cnf"
+#line 809 "gsmmap.cnf"
     tvbuff_t	*parameter_tvb; 
 	proto_tree	*subtree;
 
@@ -14184,7 +14193,7 @@ static const ber_sequence_t gsm_old_Bss_APDU_sequence[] = {
 
 static int
 dissect_gsm_old_Bss_APDU(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 628 "gsmmap.cnf"
+#line 637 "gsmmap.cnf"
  guint8		octet;
  guint8		length;
  tvbuff_t	*next_tvb;
@@ -14794,7 +14803,7 @@ dissect_gsm_old_SM_RP_DAold(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int of
 
 static int
 dissect_gsm_old_T_msisdn(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 272 "gsmmap.cnf"
+#line 281 "gsmmap.cnf"
 actx->pinfo->p2p_dir = P2P_DIR_RECV;
    offset = dissect_gsm_map_ISDN_AddressString(implicit_tag, tvb, offset, actx, tree, hf_index);
 
@@ -14808,7 +14817,7 @@ actx->pinfo->p2p_dir = P2P_DIR_RECV;
 
 static int
 dissect_gsm_old_T_serviceCentreAddressOA(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 264 "gsmmap.cnf"
+#line 273 "gsmmap.cnf"
 	actx->pinfo->p2p_dir = P2P_DIR_SENT;
   offset = dissect_gsm_map_AddressString(implicit_tag, tvb, offset, actx, tree, hf_index);
 
@@ -14853,7 +14862,7 @@ static const ber_sequence_t gsm_old_ForwardSM_Arg_sequence[] = {
 
 static int
 dissect_gsm_old_ForwardSM_Arg(gboolean implicit_tag _U_, tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
-#line 295 "gsmmap.cnf"
+#line 304 "gsmmap.cnf"
 
 	/* dissect_gsm_map_SignalInfo will return parameter_tvb in actx */
   offset = dissect_ber_sequence(implicit_tag, actx, tree, tvb, offset,