/******************************************************************************* | |
* Copyright (c) 2014-2015 IBM Corp. | |
* All rights reserved. This program and the accompanying materials | |
* are made available under the terms of the Eclipse Public License v1.0 | |
* which accompanies this distribution, and is available at | |
* http://www.eclipse.org/legal/epl-v10.html | |
* | |
* Contributors: | |
* Allan Stockdill-Mander - initial API and implementation | |
*******************************************************************************/ | |
package packets | |
import ( | |
"io" | |
) | |
type SubackMessage struct { | |
Header | |
Qos byte | |
ReturnCode byte | |
TopicId uint16 | |
MessageId uint16 | |
} | |
func NewSubackMessage(TopicId uint16, MessageId uint16, Qos byte, rc byte) *SubackMessage { | |
return &SubackMessage{ | |
Qos: Qos, | |
ReturnCode: rc, | |
TopicId: TopicId, | |
MessageId: MessageId, | |
} | |
} | |
func (s *SubackMessage) MessageType() byte { | |
return SUBACK | |
} | |
func (s *SubackMessage) encodeFlags() byte { | |
var b byte | |
b |= (s.Qos << 5) & QOSBITS | |
return b | |
} | |
func (s *SubackMessage) decodeFlags(b byte) { | |
s.Qos = (b & QOSBITS) >> 5 | |
} | |
func (s *SubackMessage) Write(w io.Writer) error { | |
packet := s.Header.pack() | |
packet.WriteByte(SUBACK) | |
packet.WriteByte(s.encodeFlags()) | |
packet.Write(encodeUint16(s.TopicId)) | |
packet.Write(encodeUint16(s.MessageId)) | |
packet.WriteByte(s.ReturnCode) | |
_, err := packet.WriteTo(w) | |
return err | |
} | |
func (s *SubackMessage) Unpack(b io.Reader) { | |
s.decodeFlags(readByte(b)) | |
s.TopicId = readUint16(b) | |
s.MessageId = readUint16(b) | |
s.ReturnCode = readByte(b) | |
} |