102 lines
3.3 KiB
Swift
102 lines
3.3 KiB
Swift
//
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// MqttDecodePubComp.swift
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// CocoaMQTT
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//
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// Created by liwei wang on 2021/8/9.
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//
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import Foundation
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public class MqttDecodePubComp: NSObject {
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var totalCount = 0
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var dataIndex = 0
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var propertyLength: Int = 0
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public var reasonCode: CocoaMQTTPUBCOMPReasonCode?
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public var msgid: UInt16 = 0
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public var reasonString: String?
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public var userProperty: [String: String]?
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public func decodePubComp(fixedHeader: UInt8, pubAckData: [UInt8]) {
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totalCount = pubAckData.count
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dataIndex = 0
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// msgid
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let msgidResult = integerCompute(data: pubAckData, formatType: formatInt.formatUint16.rawValue, offset: dataIndex)
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msgid = UInt16(msgidResult!.res)
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dataIndex = msgidResult!.newOffset
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// 3.6.2.1 PUBREL Reason Code
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// The Reason Code and Property Length can be omitted if the Reason Code is 0x00 (Success) and there are no Properties. In this case the PUBACK has a Remaining Length of 2.
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if dataIndex + 1 > pubAckData.count {
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return
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}
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guard let ack = CocoaMQTTPUBCOMPReasonCode(rawValue: pubAckData[dataIndex]) else {
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return
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}
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reasonCode = ack
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dataIndex += 1
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var protocolVersion = ""
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if let storage = CocoaMQTTStorage() {
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protocolVersion = storage.queryMQTTVersion()
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}
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if protocolVersion == "5.0" {
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// 3.6.2.2 PUBREL Properties
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// 3.6.2.2.1 Property Length
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let propertyLengthVariableByteInteger = decodeVariableByteInteger(data: pubAckData, offset: dataIndex)
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propertyLength = propertyLengthVariableByteInteger.res
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dataIndex = propertyLengthVariableByteInteger.newOffset
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let occupyIndex = dataIndex
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while dataIndex < occupyIndex + propertyLength {
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let resVariableByteInteger = decodeVariableByteInteger(data: pubAckData, offset: dataIndex)
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dataIndex = resVariableByteInteger.newOffset
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let propertyNameByte = resVariableByteInteger.res
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guard let propertyName = CocoaMQTTPropertyName(rawValue: UInt8(propertyNameByte)) else {
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break
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}
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switch propertyName.rawValue {
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// 3.6.2.2.2 Reason String
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case CocoaMQTTPropertyName.reasonString.rawValue:
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guard let result = unsignedByteToString(data: pubAckData, offset: dataIndex) else {
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break
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}
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reasonString = result.resStr
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dataIndex = result.newOffset
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// 3.6.2.2.3 User Property
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var key: String?
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var value: String?
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guard let keyRes = unsignedByteToString(data: pubAckData, offset: dataIndex) else {
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break
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}
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key = keyRes.resStr
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dataIndex = keyRes.newOffset
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guard let valRes = unsignedByteToString(data: pubAckData, offset: dataIndex) else {
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break
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}
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value = valRes.resStr
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dataIndex = valRes.newOffset
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userProperty![key!] = value
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default:
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return
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}
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}
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}
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}
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}
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