//
//  IHUdpTool.swift
//  Inhealth
//
//  Created by weclouds on 2020/8/25.
//  Copyright © 2020 weclouds. All rights reserved.
//

import UIKit

//data转换成16字符串
func dataConvertToHexString(data : Data) -> String {
    //十进制数组
    let bytes: [UInt8]? = [UInt8](data)
    var str : String = ""
    for byte in bytes! {
        //十进制转换成16进制字符串
        var s = String(byte,radix:16)
        if s.count == 1{
            s = "0" + s
        }
        str = str  + s
    }
    return str
}


//16进制字符串转成10进制
func hexStringConvertToDecimal(hexString : String) -> [UInt8] {
    let str = hexString as NSString
    let count = str.length / 2
    var arr = [UInt8]()
    for i in 0..<count {
        let subStr = str.substring(with: NSRange.init(location: i * 2, length: 2))
        
        let hex = hexStringToInt(from: subStr)
        arr.append(UInt8(hex))
    }
    return arr
}


//计算checksum - 字符串
func checksum(command : String) -> String{
    let str = command as NSString
    let count = str.length / 2
    var sum = 0x0
    for i in 0..<count {
        let subStr = str.substring(with: NSRange.init(location: i * 2, length: 2))
        sum = sum + hexStringToInt(from: subStr)
    }
    //10进制转换成16进制 - 截取最后二位
    let hexStr = String(sum,radix:16) as NSString
    if hexStr.length > 1{
      return  hexStr.substring(with: NSRange.init(location: hexStr.length - 2, length: 2))
    }else{
        return "0\(hexStr)"
    }
    
}

//16进制的字符串转换10进制
 func hexStringToInt(from:String) -> Int {
    let str = from.uppercased()
    var sum = 0
    for i in str.utf8 {
        sum = sum * 16 + Int(i) - 48 // 0-9 从48开始
        if i >= 65 {                 // A-Z 从65开始，但有初始值10，所以应该是减去55
            sum -= 7
        }
    }
    return sum
}

//10进制数据转换成16进制字符串,并拼接
func deciConvertHexStr(deciArr : [UInt8]) -> String {
    var hexTotalStr = ""
    for deci in deciArr{
        var hexStr = String(deci,radix: 16)
        if hexStr.count == 1{
            hexStr = "0\(hexStr)"
        }
        hexTotalStr = hexTotalStr + hexStr
    }
    return hexTotalStr
}