forked from gopcua/opcua
/
sequence_header.go
48 lines (40 loc) · 1.12 KB
/
sequence_header.go
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// Copyright 2018-2020 opcua authors. All rights reserved.
// Use of this source code is governed by a MIT-style license that can be
// found in the LICENSE file.
package uasc
import (
"fmt"
"github.com/arvindh123/opcua/ua"
)
// SequenceHeader represents a Sequence Header in OPC UA Secure Conversation.
type SequenceHeader struct {
SequenceNumber uint32
RequestID uint32
}
// NewSequenceHeader creates a new OPC UA Secure Conversation Sequence Header.
func NewSequenceHeader(seq, req uint32) *SequenceHeader {
return &SequenceHeader{
SequenceNumber: seq,
RequestID: req,
}
}
func (h *SequenceHeader) Decode(b []byte) (int, error) {
buf := ua.NewBuffer(b)
h.SequenceNumber = buf.ReadUint32()
h.RequestID = buf.ReadUint32()
return buf.Pos(), buf.Error()
}
func (h *SequenceHeader) Encode() ([]byte, error) {
buf := ua.NewBuffer(nil)
buf.WriteUint32(h.SequenceNumber)
buf.WriteUint32(h.RequestID)
return buf.Bytes(), buf.Error()
}
// String returns Header in string.
func (s *SequenceHeader) String() string {
return fmt.Sprintf(
"SequenceNumber: %d, RequestID: %d",
s.SequenceNumber,
s.RequestID,
)
}