77 lines
2.7 KiB
C#
77 lines
2.7 KiB
C#
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 ModBus.Net
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{
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/// <summary>
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/// 协议字节伸缩
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/// </summary>
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public abstract class ProtocalLinkerBytesExtend
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{
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/// <summary>
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/// 协议扩展，协议内容发送前调用
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/// </summary>
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/// <param name="content">扩展前的原始协议内容</param>
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/// <returns>扩展后的协议内容</returns>
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public abstract byte[] BytesExtend(byte[] content);
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/// <summary>
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/// 协议收缩，协议内容接收后调用
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/// </summary>
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/// <param name="content">收缩前的完整协议内容</param>
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/// <returns>收缩后的协议内容</returns>
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public abstract byte[] BytesDecact(byte[] content);
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}
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/// <summary>
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/// Tcp协议字节伸缩
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/// </summary>
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public class ModbusTcpProtocalLinkerBytesExtend : ProtocalLinkerBytesExtend
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{
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public override byte[] BytesExtend(byte[] content)
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{
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//Modbus/Tcp协议扩张，前面加6个字节，前面4个为0，后面两个为协议整体内容的长度
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byte[] newFormat = new byte[6 + content.Length];
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int tag = 0;
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ushort leng = (ushort)content.Length;
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Array.Copy(ValueHelper.Instance.GetBytes(tag), 0, newFormat, 0, 4);
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Array.Copy(ValueHelper.Instance.GetBytes(leng), 0, newFormat, 4, 2);
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Array.Copy(content, 0, newFormat, 6, content.Length);
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return newFormat;
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}
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public override byte[] BytesDecact(byte[] content)
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{
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//Modbus/Tcp协议收缩，抛弃前面6个字节的内容
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byte[] newContent = new byte[content.Length - 6];
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Array.Copy(content, 6, newContent, 0, newContent.Length);
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return newContent;
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}
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}
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public class ModbusRtuProtocalLinkerBytesExtend : ProtocalLinkerBytesExtend
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{
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public override byte[] BytesExtend(byte[] content)
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{
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byte[] crc = new byte[2];
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//Modbus/Tcp协议扩张，增加CRC校验
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byte[] newFormat = new byte[content.Length + 2];
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Crc16.GetInstance().GetCRC(content, ref crc);
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Array.Copy(content, 0, newFormat, 0, content.Length);
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Array.Copy(crc, 0, newFormat, newFormat.Length - 2, crc.Length);
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return newFormat;
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}
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public override byte[] BytesDecact(byte[] content)
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{
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//Modbus/Com协议收缩，抛弃后面1个字节的内容
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byte[] newContent = new byte[content.Length - 2];
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Array.Copy(content, 0, newContent, 0, newContent.Length);
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return newContent;
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}
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}
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}
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