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//
// Decoder.swift
// ADSBDecoder
//
// Created by Jacky Jack on 28/05/2024.
//
import Foundation
func BarometricAltitudeFeat(_ altitude: UInt16) -> Int {
let QBit = (altitude>>4)&0x1
if QBit == 1 {
//remove qbit
let part1:UInt16 = altitude&0xf
let part2:UInt16 = (altitude>>1)&0x7ff0
let altitude25 = part1 + part2
//print("altitude2 \(altitude25) ")
return Int(altitude25)*25-1000
}
return Int(altitude)*100-1000
}
public class Decoder {
var adsb_data: String = ""
public var DataFormat: UInt32 = 0;
public init (_ adsb_data: String) {
//print(adsb_data)
self.adsb_data = adsb_data
//get the first 8 bits as integer
let startI = adsb_data.startIndex
let endI = adsb_data.index(startI, offsetBy: 1)
let firstByteString = adsb_data[startI...endI]
//print("\(firstByteString)")
if let ControlMsg = UInt32(firstByteString, radix: 16) {
//print("ControlMsg = \(ControlMsg)")
let CM_DataFormat = (ControlMsg&0xF8)>>3
DataFormat = CM_DataFormat
//let CM_TranspoderCapability = ControlMsg&(0x7)
}
//print("Data Format \(DataFormat)")
}
public func getDataFormat17() -> DataFormat17? {
if (DataFormat != 17) {
return nil
}
//let startI = adsb_data.index(adsb_data.startIndex, offsetBy: 1)
//let endI = adsb_data.index(adsb_data.endIndex, offsetBy: -1)
//let adsbData = adsb_data[startI...endI]
let ret:DataFormat17 = DataFormat17(adsb_data)
return ret;
}
func getDataFormat18() {
print("Not implemented")
}
}
func ICAOAlphabet(_ code: UInt8) -> String {
if ((code>=1) && (code<=26)) {
return String(UnicodeScalar(code+64))
} else if ((code >= 48)&&(code<=57)) {
return String(UnicodeScalar(code))
} else if (code==32) {
return " "
}
return "#"
}
func ICAO2String(_ b1: UInt8, _ b2: UInt8, _ b3: UInt8, _ b4: UInt8, _ b5: UInt8, _ b6: UInt8, _ b7: UInt8, _ b8: UInt8) -> String {
return ICAOAlphabet(b1)+ICAOAlphabet(b2)+ICAOAlphabet(b3)+ICAOAlphabet(b4)+ICAOAlphabet(b5)+ICAOAlphabet(b6)+ICAOAlphabet(b7)+ICAOAlphabet(b8)
}
class DataFormat19:CustomStringConvertible {
init(_ bindata:ArraySlice<UInt8>) {
print("Dataformat: 19")
}
var description: String {
return ""
}
}
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