detect: helper function for multibuffer registration

So that rust does not need to know about SIG_FLAG_TOCLIENT value

src/detect-engine-helper.c

@@ -81,6 +81,20 @@ int DetectHelperBufferMpmRegister(const char *name, const char *desc, AppProto a
     return DetectBufferTypeGetByName(name);
 }
 
+int DetectHelperMultiBufferMpmRegister(const char *name, const char *desc, AppProto alproto,
+        bool toclient, bool toserver, InspectionMultiBufferGetDataPtr GetData)
+{
+    if (toserver) {
+        DetectAppLayerMultiRegister(name, alproto, SIG_FLAG_TOSERVER, 0, GetData, 2, 0);
+    }
+    if (toclient) {
+        DetectAppLayerMultiRegister(name, alproto, SIG_FLAG_TOCLIENT, 0, GetData, 2, 0);
+    }
+    DetectBufferTypeSupportsMultiInstance(name);
+    DetectBufferTypeSetDescriptionByName(name, desc);
+    return DetectBufferTypeGetByName(name);
+}
+
 int DetectHelperKeywordRegister(const SCSigTableElmt *kw)
 {
     if (DETECT_TBLSIZE_IDX >= DETECT_TBLSIZE) {

src/detect-engine-helper.h

@@ -39,6 +39,8 @@ InspectionBuffer *DetectHelperGetData(struct DetectEngineThreadCtx_ *det_ctx,
         const int list_id, SimpleGetTxBuffer GetBuf);
 int DetectHelperBufferMpmRegister(const char *name, const char *desc, AppProto alproto,
         bool toclient, bool toserver, InspectionBufferGetDataPtr GetData);
+int DetectHelperMultiBufferMpmRegister(const char *name, const char *desc, AppProto alproto,
+        bool toclient, bool toserver, InspectionMultiBufferGetDataPtr GetData);
 
 InspectionBuffer *DetectHelperGetMultiData(struct DetectEngineThreadCtx_ *det_ctx,
         const DetectEngineTransforms *transforms, Flow *f, const uint8_t flow_flags, void *txv,