using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace UAS_MES_NEW.PublicMethod
{
    internal class FACT_DATA_HEAD
    {
        public const int MY_LEN = 8;
        public static int PROTOCOL_FLAG = 0x4C4F4F54;


        private UInt32 nFlag { get; set; }
        private UInt32 nDataLen { get; set; }

        public FACT_DATA_HEAD(byte[] arrData)
        {
            if (arrData == null)
            {
                nFlag = (UInt32)PROTOCOL_FLAG;
                nDataLen = 0;
            }
            else
            {
                if (arrData.Length < MY_LEN)
                {
                    nFlag = (UInt32)PROTOCOL_FLAG;
                    nDataLen = 0;
                }
                else
                {
                    nFlag = (UInt32)BitConverter.ToInt32(arrData, 0);
                    nDataLen = (UInt32)BitConverter.ToInt32(arrData, 4);
                }
            }
        }

        public void setDataLen(int nLen)
        {
            nDataLen = (UInt32)nLen;
        }
        public int getDatalen()
        {
            return (int)nDataLen;
        }
        public int getFlag()
        {
            return (int)nFlag;
        }
        public byte[] getBytes()
        {
            byte[] bytHead = new byte[MY_LEN];
            byte[] bytSrc = BitConverter.GetBytes(nFlag);
            Array.Copy(bytSrc, 0, bytHead, 0, bytSrc.Length);

            bytSrc = BitConverter.GetBytes(nDataLen);
            Array.Copy(bytSrc, 0, bytHead, 4, bytSrc.Length);
            return bytHead;
        }
    }
}