using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.NetworkInformation;
using System.Configuration;
using System.Net.Sockets;
using System.Net;
using System.ComponentModel.DataAnnotations.Schema;

namespace InSituLaboratory.Entities
{
    [NotMapped]
    public static class tools
    {
        static Dictionary<string, bool> Txt_Used = new Dictionary<string, bool>();

        #region 获取当前设备的所有端口号

        /// <summary>
        /// 获取当前设备的所有端口号
        /// </summary>
        /// <returns></returns>
        public static string[] GetSerialPort()
        {
            string[] ports = null;
            return ports;
        }
        #endregion

        #region PING IP是否ping通
        /// <summary>
        /// IP地址是否ping通
        /// </summary>
        /// <param name="strIP">IP地址例如“10.8.2.1”</param>
        /// <returns></returns>
        public static bool PingIp(string strIP)
        {
            bool bRet = false;
            try
            {
                Ping pingSend = new Ping();
                PingReply reply = pingSend.Send(strIP, 1000);
                if (reply.Status == IPStatus.Success)
                    bRet = true;
            }
            catch (Exception)
            {
                bRet = false;
            }
            return bRet;
        }
        #endregion

        #region 添加日志

        //获取当前程序运行路径
        private static string Save_Path = AppDomain.CurrentDomain.SetupInformation.ApplicationBase + @"数据记录\";

        public static void Logging(string message)
        {
            AddLgoToTXT("Log.txt", Save_Path + DateTime.Now.ToString("yyyy_MM_dd") + @"\", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + " ---- " + message + "\r\n");
        }

        public static void AddLog(string logstring)
        {
            AddLgoToTXT("解析数据.txt", AppDomain.CurrentDomain.SetupInformation.ApplicationBase + @"数据记录\" + DateTime.Now.ToString("yyyy_MM_dd") + @"\", logstring);
        }
        #endregion

        #region 生成并保存本地文件
        /// <summary>
        /// 文件自动保存
        /// </summary>
        /// <param name="_file_name">文件名称</param>
        /// <param name="path">保存路径</param>
        /// <param name="logstring">文件内容</param>
        public static void AddLgoToTXT(string _file_name, string path, string logstring)
        {
            //检查是否存在该路径
            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }

            path = path + _file_name;
            //检查该路径下是否存在该文件
            if (!File.Exists(path))
            {
                FileStream stream = null;
                try
                {
                    stream = File.Create(path);
                    stream.Close();
                    stream.Dispose();
                }
                catch (Exception ex)
                {

                }
                finally
                {
                    if (stream != null)
                    {
                        stream.Close();
                        stream.Dispose();
                    }
                }

            }
            if (!Txt_Used.ContainsKey(path))
            {
                Txt_Used.Add(path, true);
            }
            else
            {
                if (Txt_Used[path])
                {
                    return;
                }
                else
                {
                    Txt_Used[path] = true;
                }
            }
            FileStream fs = null;
            try
            {
                //[1]创建文件流 文件路径 和枚举类型的文件操作类型
                fs = new FileStream(path, FileMode.Append);
                //[2]创建写入器
                StreamWriter sw = new StreamWriter(fs);
                //[3]以流的方式写入数据
                sw.Write(logstring);
                //[4]关闭写入器
                sw.Close();
                //[5]关闭文件流
                fs.Close();
                Txt_Used[path] = false;
            }
            catch (Exception ex)
            {

            }
            finally
            {
                if (fs != null)
                {
                    fs.Close();
                    fs.Dispose();
                }
            }
        }
        #endregion

        #region 读取本地TXT文件

        public static string ReadFromTXT(string _file_name, string path)
        {
            //检查是否存在该路径 
            if (!Directory.Exists(path))
                return "所选时间段没有系统日志";
            path = path + _file_name;
            //检查该路径下是否存在该文件
            if (!File.Exists(path))
                return "所选时间段没有系统日志";
            //如果文件占用就
            if (FileIsInUse(new FileInfo(path)))
                return "";
            //[1]创建文件流
            FileStream fs = new FileStream(path, FileMode.Open);
            //【2】创建读取器
            //Encoding.Default 读取未知文件是使用default格式
            //StreamReader sr = new StreamReader(fs,Encoding.Default);
            StreamReader sr = new StreamReader(fs);
            //【3】以流的方式读取数据
            string txt = sr.ReadToEnd();
            //[4]关闭读取器
            sr.Close();
            //【5】关闭文件流
            fs.Close();

            return txt;
        }


        /// <summary>
        /// 将文本文件读取到末尾
        /// </summary>
        /// <param name="pathAName"></param>
        /// <returns></returns>
        public static string ReadTXT_StreamReader(string pathAName)
        {
            StreamReader ObjectName = new StreamReader(pathAName);
            return ObjectName.ReadToEnd();
        }

        /// <summary>
        /// 逐行读取文件,返回数组
        /// </summary>
        /// <param name="pathAName"></param>
        /// <returns></returns>
        public static string[] ReadTXT_ReadAllLines(string pathAName)
        {
            string[] txtContent = null;
            txtContent = System.IO.File.ReadAllLines(pathAName, Encoding.UTF8);
            return txtContent;
        }
        #endregion

        #region 文件是否被占用
        static bool FileIsInUse(FileInfo file)
        {
            FileStream stream = null;
            try
            {
                stream = file.Open(FileMode.Open, FileAccess.ReadWrite, FileShare.None);
            }
            catch (IOException)
            {
                //如果文件被占用，即
                //1.文件正在被另一个线程处理
                //2.或者正在被另一个线程处理
                //3.或者文件不存在
                return true;
            }
            finally
            {
                if (stream != null)
                    stream.Close();
            }
            return false;
        }
        #endregion

        #region  CRC校验
        private static readonly byte[] aucCRCHi = {
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
             0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
             0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
             0x00, 0xC1, 0x81, 0x40
         };
        private static readonly byte[] aucCRCLo = {
             0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7,
             0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E,
             0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9,
             0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC,
             0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,
             0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32,
             0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D,
             0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38,
             0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF,
             0x2D, 0xED, 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
             0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1,
             0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4,
             0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB,
             0x69, 0xA9, 0xA8, 0x68, 0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA,
             0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,
             0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0,
             0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97,
             0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C, 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E,
             0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89,
             0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
             0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83,
             0x41, 0x81, 0x80, 0x40
         };
        public static byte[] Crc16(byte[] pucFrame, int usLen)
        {
            int i = 0;
            byte crcHi = 0xFF;
            byte crcLo = 0xFF;
            ushort iIndex = 0x0000;

            while (usLen-- > 0)
            {
                iIndex = (ushort)(crcLo ^ pucFrame[i++]);
                crcLo = (byte)(crcHi ^ aucCRCHi[iIndex]);
                crcHi = aucCRCLo[iIndex];
            }

            return new byte[] { crcLo, crcHi };
        }


        #endregion

        #region CRC 异或校验
        public static byte GetXor(byte[] data)
        {
            byte CheckCode = 0;
            int len = data.Length;
            for (int i = 0; i < len; i++)
            {
                CheckCode ^= data[i];
            }
            return CheckCode;
        }
        #endregion

        #region 16进制转字符串ASCII
        /// <summary>
        /// 16进制转字符串ASCII
        /// </summary>
        /// <param name="hs"></param>
        /// <param name="encode"></param>
        /// <returns></returns>
        public static string HexStringToString(string hs, Encoding encode)
        {
            StringBuilder strTemp = new StringBuilder();
            byte[] b = new byte[hs.Length / 2];
            for (int i = 0; i < hs.Length / 2; i++)
            {
                strTemp.Clear();
                strTemp.Append(hs.Substring(i * 2, 2));
                b[i] = Convert.ToByte(strTemp.ToString(), 16);
            }
            return encode.GetString(b);
        }
        #endregion

        #region 16进制转2进制
        /// <summary>
        /// //16转2方法
        /// </summary>
        /// <param name="hexString"></param>
        /// <returns></returns>
        public static string HexString2BinString(string hexString)
        {
            try
            {
                string result = string.Empty;
                foreach (char c in hexString)
                {
                    int v = Convert.ToInt32(c.ToString(), 16);
                    int v2 = int.Parse(Convert.ToString(v, 2));
                    // 去掉格式串中的空格，即可去掉每个4位二进制数之间的空格，
                    result += string.Format("{0:d4} ", v2);
                }
                return result;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                throw;
            }
        }
        #endregion

        #region 字节数组转16进制字符串
        /// <summary> 
        /// 字节数组转16进制字符串 
        /// </summary> 
        /// <param name="bytes"></param> 
        /// <returns></returns> 
        public static string byteToHexStr(byte[] bytes)
        {
            string returnStr = "";
            if (bytes != null)
            {
                for (int i = 0; i < bytes.Length; i++)
                {
                    returnStr += bytes[i].ToString("X2");
                }
            }
            return returnStr;
        }
        #endregion

        #region 16进制原码字符串转字节数组
        /// <summary>
        /// 16进制原码字符串转字节数组
        /// </summary>
        /// <param name="hexString">"AABBCC"或"AA BB CC"格式的字符串</param>
        /// <returns></returns>
        public static byte[] ConvertHexStringToBytes(string hexString)
        {
            hexString = hexString.Replace(" ", "");
            if (hexString.Length % 2 != 0)
            {
                throw new ArgumentException("参数长度不正确");
            }

            byte[] returnBytes = new byte[hexString.Length / 2];
            for (int i = 0; i < returnBytes.Length; i++)
            {
                returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
            }

            return returnBytes;
        }
        #endregion


        #region 根据1/0 转换 True/False
        public static List<bool> O_C(string o_c)
        {
            o_c = o_c.Trim();
            List<bool> result = new List<bool>();
            for (int i = 0; i < o_c.Length; i++)
            {
                if (o_c.Substring(i, 1).Equals("1"))
                {
                    result.Add(true);
                }
                else if (o_c.Substring(i, 1).Equals("0"))
                {
                    result.Add(false);
                }
            }

            return result;
        }
        #endregion

        #region 16进制转ASI码字符串
        /// <summary>
        /// 将一条十六进制字符串转换为ASCII
        /// </summary>
        /// <param name="hexstring">一条十六进制字符串</param>
        /// <returns>返回一条ASCII码</returns>
        public static string HexStringToASCII(string hexstring)
        {
            byte[] bt = HexStringToBinary(hexstring);
            string lin = "";
            for (int i = 0; i < bt.Length; i++)
            {
                lin = lin + bt[i] + " ";
            }


            string[] ss = lin.Trim().Split(new char[] { ' ' });
            char[] c = new char[ss.Length];
            int a;
            for (int i = 0; i < c.Length; i++)
            {
                a = Convert.ToInt32(ss[i]);
                c[i] = Convert.ToChar(a);
            }

            string b = new string(c);
            return b;
        }

        /**/
        /// <summary>
        /// 16进制字符串转换为二进制数组
        /// </summary>
        /// <param name="hexstring">用空格切割字符串</param>
        /// <returns>返回一个二进制字符串</returns>
        public static byte[] HexStringToBinary(string hexstring)
        {

            string[] tmpary = hexstring.Trim().Split(' ');
            byte[] buff = new byte[tmpary.Length];
            for (int i = 0; i < buff.Length; i++)
            {
                buff[i] = Convert.ToByte(tmpary[i], 16);
            }
            return buff;
        }
        #endregion

        #region 配置文件操作
        private static Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
        /// <summary>
        /// 获取配置文件
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string GetAppSetting(string key)
        {
            if (ConfigurationManager.AppSettings.AllKeys.Contains(key))
            {
                string value = config.AppSettings.Settings[key].Value;
                return value;
            }
            else
            {
                return null;
            }
        }
        /// <summary>
        /// 更新配置文件信息
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void UpdateAppSettings(string key, string value)
        {
            if (GetAppSetting(key) == value)   //如果写入的配置文件和之前一致 就不写入了
                return;
            if (ConfigurationManager.AppSettings.AllKeys.Contains(key))
            {
                config.AppSettings.Settings[key].Value = value;
                config.Save(ConfigurationSaveMode.Modified);
                ConfigurationManager.RefreshSection("appSettings");//刷新数据
            }
            else
            {
                Console.WriteLine("当前节点不存在!");
            }
        }
        #endregion

        #region Telnet  判断某个端口是否开放

        public static bool TelnetPort(string ip, int port)
        {
            if (checkPingEnable(ip))
            {
                if (checkPortEnable(ip, port))
                {
                    return true;
                }
            }
            return false;
        }

        //检查是否ping通
        public static bool checkPingEnable(string _ip)
        {
            bool _isEnable = false;
            try
            {
                Ping pingSender = new Ping();
                PingReply reply = pingSender.Send(_ip, 120);//第一个参数为ip地址，第二个参数为ping的时间 
                if (reply.Status == IPStatus.Success)
                {
                    _isEnable = true;
                }
                else
                {
                    _isEnable = false;
                }
            }
            catch (Exception)
            {

                _isEnable = false;
            }
            return _isEnable;
        }

        /// <summary>
        /// telnet port 
        /// </summary>
        /// <param name="_ip"></param>
        /// <param name="_port"></param>
        /// <returns></returns>
        public static bool checkPortEnable(string _ip, int _port)
        {
            //将IP和端口替换成为你要检测的
            string ipAddress = _ip;
            int portNum = _port;
            IPAddress ip = IPAddress.Parse(ipAddress);
            IPEndPoint point = new IPEndPoint(ip, portNum);

            bool _portEnable = false;
            try
            {
                using (Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
                {
                    sock.Connect(point);
                    //Console.WriteLine("连接{0}成功!", point);
                    sock.Close();

                    _portEnable = true;
                }
            }
            catch (SocketException e)
            {
                //Console.WriteLine("连接{0}失败", point);
                _portEnable = false;
            }
            return _portEnable;
        }
        #endregion

        #region  内存清理
        /// <summary>
        ///设置线程工作的空间
        /// </summary>
        /// <param name="process">线程</param>
        /// <param name="minSize">最小空间</param>
        /// <param name="maxSize">最大空间</param>
        /// <returns></returns>
        [System.Runtime.InteropServices.DllImport("kernel32.dll", EntryPoint = "SetProcessWorkingSetSize", ExactSpelling = true, CharSet = System.Runtime.InteropServices.CharSet.Ansi, SetLastError = true)]
        private static extern int SetProcessWorkingSetSize(IntPtr process, int minimumWorkingSetSize, int maximumWorkingSetSize);
        public static void ClearMemory(object o)
        {
            GC.Collect();
            GC.SuppressFinalize(o);


            if (Environment.OSVersion.Platform == PlatformID.Win32NT)
            {
                SetProcessWorkingSetSize(System.Diagnostics.Process.GetCurrentProcess().Handle, -1, -1);
            }
        }
        #endregion

        #region Other
        public static byte[] intoBytes(int value)
        {
            byte[] src = new byte[4]
            {
                (byte)(value & 0xFF),
                (byte)(value >> 8 & 0xFF),
                (byte)(value >> 16 & 0xFF),
                (byte)(value >> 24 & 0xFF)
            };
            return src;
        }

        public static byte[] shortoBytes(int value)
        {
            byte[] src = new byte[2]
            {
                (byte)(value & 0xFF),
                (byte)(value >> 8 & 0xFF)
            };
            return src;
        }
        #endregion

        #region TcpClient检测 / Socket检测
        /// <summary>
        /// TcpClient检测
        /// </summary>
        /// <param name="ip">ip地址</param>
        /// <param name="port">端口号</param>
        public static bool TcpClientCheck(string ip, int port)
        {
            IPAddress ipa = IPAddress.Parse(ip);
            IPEndPoint point = new IPEndPoint(ipa, port);
            TcpClient tcp = null;

            try
            {
                tcp = new TcpClient();
                tcp.Connect(point);
                //Console.WriteLine("端口打开");
                return true;
            }
            catch (Exception ex)
            {
                //Console.WriteLine("计算机端口检测失败，错误消息为：" + ex.Message);
                return false;
            }
            finally
            {
                if (tcp != null)
                {
                    tcp.Close();
                }
            }
        }
        /// <summary>
        /// Socket检测
        /// </summary>
        /// <param name="ip">ip地址</param>
        /// <param name="port">端口号</param>
        public static bool SocketCheck(string ip, int port)
        {
            Socket sock = null;
            try
            {
                IPAddress ipa = IPAddress.Parse(ip);
                IPEndPoint point = new IPEndPoint(ipa, port);
                sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                sock.Connect(point);
                //Console.WriteLine("端口打开");
                return true;
            }
            catch (SocketException ex)
            {
                //Console.WriteLine("计算机端口检测失败，错误消息为：" + ex.Message);
                return false;
            }
            finally
            {
                if (sock != null)
                {
                    sock.Close();
                    sock.Dispose();
                }
            }
        }
        #endregion

        #region byte数组按长度在前面补0
        /// <summary>
        /// byte数组按长度在前面补0
        /// </summary>
        /// <param name="array"></param>
        /// <param name="targetLength"></param>
        /// <returns></returns>
        /// <exception cref="ArgumentNullException"></exception>
        /// <exception cref="ArgumentOutOfRangeException"></exception>
        public static byte[] PadArrayWithZeros(byte[] array, int targetLength)
        {
            if (array == null)
                throw new ArgumentNullException(nameof(array));
            if (targetLength <= 0)
                throw new ArgumentOutOfRangeException(nameof(targetLength), "Target length must be a positive integer.");
            if (targetLength <= array.Length)
                return array; // No need to pad

            byte[] paddedArray = new byte[targetLength];
            Array.Copy(array, 0, paddedArray, targetLength - array.Length, array.Length);
            return paddedArray;
        }
        #endregion

        #region CRC-8  x8+x5+x4+1 0x31(0x131)
        /// <summary>
        /// CRC8位校验表
        /// </summary>
        private static byte[] CRC8Table = new byte[]
        {
            0,94,188,226,97,63,221,131,194,156,126,32,163,253,31,65,
            157,195,33,127,252,162,64,30, 95,1,227,189,62,96,130,220,
            35,125,159,193,66,28,254,160,225,191,93,3,128,222,60,98,
            190,224,2,92,223,129,99,61,124,34,192,158,29,67,161,255,
            70,24,250,164,39,121,155,197,132,218,56,102,229,187,89,7,
            219,133,103,57,186,228,6,88,25,71,165,251,120,38,196,154,
            101,59,217,135,4,90,184,230,167,249,27,69,198,152,122,36,
            248,166,68,26,153,199,37,123,58,100,134,216,91,5,231,185,
            140,210,48,110,237,179,81,15,78,16,242,172,47,113,147,205,
            17,79,173,243,112,46,204,146,211,141,111,49,178,236,14,80,
            175,241,19,77,206,144,114,44,109,51,209,143,12,82,176,238,
            50,108,142,208,83,13,239,177,240,174,76,18,145,207,45,115,
            202,148,118,40,171,245,23,73,8,86,180,234,105,55,213,139,
            87,9,235,181,54,104,138,212,149,203, 41,119,244,170,72,22,
            233,183,85,11,136,214,52,106,43,117,151,201,74,20,246,168,
            116,42,200,150,21,75,169,247,182,232,10,84,215,137,107,53
        };

        public static byte CRC(byte[] buffer)
        {
            return CRC(buffer, 0, buffer.Length);
        }

        public static byte CRC(byte[] buffer, int off, int len)
        {
            byte crc = 0;
            if (buffer == null)
            {
                throw new ArgumentNullException("buffer");
            }
            if (off < 0 || len < 0 || off + len > buffer.Length)
            {
                throw new ArgumentOutOfRangeException();
            }

            for (int i = off; i < len; i++)
            {
                crc = CRC8Table[crc ^ buffer[i]];
            }
            return crc;
        }


        #endregion
    }
}