native: optimize contract call

Port neo-project/neo#3170.

Close #3346

Signed-off-by: Ekaterina Pavlova <ekt@morphbits.io>

pkg/core/state/contract.go

@@ -93,12 +93,16 @@ func (c *Contract) FromStackItem(item stackitem.Item) error {
 	if err != nil {
 		return err
 	}
-	c.NEF, err = nef.FileFromBytes(bytes)
+	skipCheck := false
+	if c.UpdateCounter > 0 {
+		skipCheck = true
+	}
+	c.NEF, err = nef.FileFromBytes(bytes, skipCheck)
 	if err != nil {
 		return err
 	}
 	m := new(manifest.Manifest)
-	err = m.FromStackItem(arr[4])
+	err = m.FromStackItem(arr[4], skipCheck)
 	if err != nil {
 		return err
 	}

pkg/smartcontract/manifest/manifest.go

@@ -206,13 +206,13 @@ func extraToStackItem(rawExtra []byte) stackitem.Item {
 }
 
 // FromStackItem converts stackitem.Item to Manifest.
-func (m *Manifest) FromStackItem(item stackitem.Item) error {
+func (m *Manifest) FromStackItem(item stackitem.Item, skipCheck ...bool) error {
 	var err error
 	if item.Type() != stackitem.StructT {
 		return errors.New("invalid Manifest stackitem type")
 	}
 	str := item.Value().([]stackitem.Item)
-	if len(str) != 8 {
+	if (len(skipCheck) == 0 || !skipCheck[0]) && len(str) != 8 {
 		return errors.New("invalid stackitem length")
 	}
 	m.Name, err = stackitem.ToString(str[0])

pkg/smartcontract/nef/nef.go

@@ -184,9 +184,9 @@ func (n File) bytes(checkSize bool) ([]byte, error) {
 }
 
 // FileFromBytes returns a NEF File deserialized from the given bytes.
-func FileFromBytes(source []byte) (File, error) {
+func FileFromBytes(source []byte, skipCheck ...bool) (File, error) {
 	result := File{}
-	if len(source) > stackitem.MaxSize {
+	if len(source) > stackitem.MaxSize && (len(skipCheck) == 0 || !skipCheck[0]) {
 		return result, fmt.Errorf("invalid NEF file size: expected %d at max, got %d", stackitem.MaxSize, len(source))
 	}
 	r := io.NewBinReaderFromBuf(source)