Temporarily add go-agentx (w/ fixes to lexico ordering)

go-agentx/pdu/response.go

@@ -0,0 +1,68 @@
+// Copyright 2018 The agentx authors
+// Licensed under the LGPLv3 with static-linking exception.
+// See LICENCE file for details.
+
+package pdu
+
+import (
+	"bytes"
+	"encoding/binary"
+	"time"
+)
+
+// Response defines the pdu response packet.
+type Response struct {
+	UpTime    time.Duration
+	Error     Error
+	Index     uint16
+	Variables Variables
+}
+
+// Type returns the pdu packet type.
+func (r *Response) Type() Type {
+	return TypeResponse
+}
+
+// MarshalBinary returns the pdu packet as a slice of bytes.
+func (r *Response) MarshalBinary() ([]byte, error) {
+	buffer := &bytes.Buffer{}
+
+	upTime := uint32(r.UpTime.Seconds() / 100)
+	binary.Write(buffer, binary.LittleEndian, &upTime)
+	binary.Write(buffer, binary.LittleEndian, &r.Error)
+	binary.Write(buffer, binary.LittleEndian, &r.Index)
+
+	vBytes, err := r.Variables.MarshalBinary()
+	if err != nil {
+		return nil, err
+	}
+	buffer.Write(vBytes)
+
+	return buffer.Bytes(), nil
+}
+
+// UnmarshalBinary sets the packet structure from the provided slice of bytes.
+func (r *Response) UnmarshalBinary(data []byte) error {
+	buffer := bytes.NewBuffer(data)
+
+	upTime := uint32(0)
+	if err := binary.Read(buffer, binary.LittleEndian, &upTime); err != nil {
+		return err
+	}
+	r.UpTime = time.Second * time.Duration(upTime*100)
+	if err := binary.Read(buffer, binary.LittleEndian, &r.Error); err != nil {
+		return err
+	}
+	if err := binary.Read(buffer, binary.LittleEndian, &r.Index); err != nil {
+		return err
+	}
+	if err := r.Variables.UnmarshalBinary(data[8:]); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (r *Response) String() string {
+	return "(response " + r.Variables.String() + ")"
+}