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

go-agentx/pdu/flags.go

@@ -0,0 +1,45 @@
+// Copyright 2018 The agentx authors
+// Licensed under the LGPLv3 with static-linking exception.
+// See LICENCE file for details.
+
+package pdu
+
+import (
+	"fmt"
+	"strings"
+)
+
+// The various pdu packet flags.
+const (
+	FlagInstanceRegistration Flags = 1 << 0
+	FlagNewIndex             Flags = 1 << 1
+	FlagAnyIndex             Flags = 1 << 2
+	FlagNonDefaultContext    Flags = 1 << 3
+	FlagNetworkByteOrder     Flags = 1 << 4
+)
+
+// Flags defines pdu packet flags.
+type Flags byte
+
+func (f Flags) String() string {
+	result := []string{}
+	if f&FlagInstanceRegistration != 0 {
+		result = append(result, "FlagInstanceRegistration")
+	}
+	if f&FlagNewIndex != 0 {
+		result = append(result, "FlagNewIndex")
+	}
+	if f&FlagAnyIndex != 0 {
+		result = append(result, "FlagAnyIndex")
+	}
+	if f&FlagNonDefaultContext != 0 {
+		result = append(result, "FlagNonDefaultContext")
+	}
+	if f&FlagNetworkByteOrder != 0 {
+		result = append(result, "FlagNetworkByteOrder")
+	}
+	if len(result) == 0 {
+		return "(FlagNone)"
+	}
+	return fmt.Sprintf("(%s)", strings.Join(result, " | "))
+}