using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace IStation.Model
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{
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/// <summary>
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/// 报文头
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/// </summary>
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public class Header
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{
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/// <summary>
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///
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/// </summary>
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public Header() { }
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private Header(byte[] bts)
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{
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Type = (eDatagramType)BitConverter.ToInt32(bts, 4);
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Array.Copy(bts, 8, Memo, 0, 4);
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KeyNum = BitConverter.ToInt32(bts, 12);
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PackLen = BitConverter.ToInt32(bts, 16);
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}
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/// <summary>
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///
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/// </summary>
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public byte[] Head
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{
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get { return _head.ToArray(); }
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}
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private byte[] _head = new byte[4] { 0xa5, 0xa5, 0xa5, 0xa5, };
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/// <summary>
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///
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/// </summary>
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public eDatagramType Type { get; set; }
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/// <summary>
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///
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/// </summary>
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public byte[] Memo { get; set; } = new byte[4];
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/// <summary>
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///
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/// </summary>
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public int KeyNum { get; set; }
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/// <summary>
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///
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/// </summary>
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public int PackLen { get; set; }
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/// <summary>
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///
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/// </summary>
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public static Header Get(byte[] bts)
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{
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if (bts == null)
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return null;
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if (bts.Count() != 20)
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return null;
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if (bts[0] != 0xa5)
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return null;
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if (bts[1] != 0xa5)
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return null;
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if (bts[2] != 0xa5)
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return null;
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if (bts[3] != 0xa5)
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return null;
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return new Header(bts);
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}
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/// <summary>
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///
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/// </summary>
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public byte[] GetBuffer()
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{
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var bts = new byte[20];
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Array.Copy(Head, 0, bts, 0, 4);
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var typeBuffer = BitConverter.GetBytes((int)Type);
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Array.Copy(typeBuffer, 0, bts, 4, 4);
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Array.Copy(Memo, 0, bts, 8, 4);
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var keyNumBuffer = BitConverter.GetBytes(KeyNum);
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Array.Copy(keyNumBuffer, 0, bts, 12, 4);
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var packLenBuffer = BitConverter.GetBytes(PackLen);
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Array.Copy(packLenBuffer, 0, bts, 16, 4);
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return bts;
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}
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}
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}
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