feat: add vendor

vendor/github.com/dnstap/golang-dnstap/Decoder.go

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2019 by Farsight Security, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package dnstap
+
+import (
+	framestream "github.com/farsightsec/golang-framestream"
+	"google.golang.org/protobuf/proto"
+)
+
+// A Decoder reads and parses Dnstap messages from an io.Reader
+type Decoder struct {
+	buf []byte
+	r   Reader
+}
+
+// NewDecoder creates a Decoder using the given dnstap Reader, accepting
+// dnstap data frames up to maxSize in size.
+func NewDecoder(r Reader, maxSize int) *Decoder {
+	return &Decoder{
+		buf: make([]byte, maxSize),
+		r:   r,
+	}
+}
+
+// Decode reads and parses a Dnstap message from the Decoder's Reader.
+// Decode silently discards data frames larger than the Decoder's configured
+// maxSize.
+func (d *Decoder) Decode(m *Dnstap) error {
+	for {
+		n, err := d.r.ReadFrame(d.buf)
+
+		switch err {
+		case framestream.ErrDataFrameTooLarge:
+			continue
+		case nil:
+			break
+		default:
+			return err
+		}
+
+		return proto.Unmarshal(d.buf[:n], m)
+	}
+}