rlp: add support for boolean encoding/decoding

rlp/decode.go

@@ -183,6 +183,8 @@ func makeDecoder(typ reflect.Type, tags tags) (dec decoder, err error) {
 		return decodeBigIntNoPtr, nil
 	case isUint(kind):
 		return decodeUint, nil
+	case kind == reflect.Bool:
+		return decodeBool, nil
 	case kind == reflect.String:
 		return decodeString, nil
 	case kind == reflect.Slice || kind == reflect.Array:
@@ -211,6 +213,15 @@ func decodeUint(s *Stream, val reflect.Value) error {
 	return nil
 }
 
+func decodeBool(s *Stream, val reflect.Value) error {
+	b, err := s.Bool()
+	if err != nil {
+		return wrapStreamError(err, val.Type())
+	}
+	val.SetBool(b)
+	return nil
+}
+
 func decodeString(s *Stream, val reflect.Value) error {
 	b, err := s.Bytes()
 	if err != nil {
@@ -697,6 +708,24 @@ func (s *Stream) uint(maxbits int) (uint64, error) {
 	}
 }
 
+// Bool reads an RLP string of up to 1 byte and returns its contents
+// as an boolean. If the input does not contain an RLP string, the
+// returned error will be ErrExpectedString.
+func (s *Stream) Bool() (bool, error) {
+	num, err := s.uint(8)
+	if err != nil {
+		return false, err
+	}
+	switch num {
+	case 0:
+		return false, nil
+	case 1:
+		return true, nil
+	default:
+		return false, fmt.Errorf("rlp: invalid boolean value: %d", num)
+	}
+}
+
 // List starts decoding an RLP list. If the input does not contain a
 // list, the returned error will be ErrExpectedList. When the list's
 // end has been reached, any Stream operation will return EOL.