189 lines
5.3 KiB
C#
189 lines
5.3 KiB
C#
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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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namespace MECF.Framework.RT.Core.IoProviders.Siemens.Transfer
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{
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/// <summary>
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/// 按照字节错位的数据转换类
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/// </summary>
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public class ReverseWordTransform : ByteTransformBase
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{
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#region Constructor
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/// <summary>
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/// 实例化一个默认的对象
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/// </summary>
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public ReverseWordTransform( )
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{
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this.DataFormat = DataFormat.ABCD;
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}
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/// <summary>
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/// 使用指定的数据解析来实例化对象
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/// </summary>
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/// <param name="dataFormat">数据规则</param>
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public ReverseWordTransform( DataFormat dataFormat ) : base( dataFormat )
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{
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}
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#endregion
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#region Private Method
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/// <summary>
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/// 按照字节错位的方法
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/// </summary>
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/// <param name="buffer">实际的字节数据</param>
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/// <param name="index">起始字节位置</param>
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/// <param name="length">数据长度</param>
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/// <returns>处理过的数据信息</returns>
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private byte[] ReverseBytesByWord( byte[] buffer, int index, int length )
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{
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if (buffer == null) return null;
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// copy data
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byte[] tmp = new byte[length];
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for (int i = 0; i < length; i++)
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{
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tmp[i] = buffer[index + i];
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}
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// change
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for (int i = 0; i < length / 2; i++)
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{
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byte b = tmp[i * 2 + 0];
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tmp[i * 2 + 0] = tmp[i * 2 + 1];
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tmp[i * 2 + 1] = b;
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}
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return tmp;
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}
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private byte[] ReverseBytesByWord( byte[] buffer )
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{
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return ReverseBytesByWord( buffer, 0, buffer.Length );
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}
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#endregion
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#region Public Properties
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/// <summary>
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/// 字符串数据是否按照字来反转
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/// </summary>
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public bool IsStringReverse { get; set; }
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#endregion
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#region Get Value From Bytes
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/// <summary>
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/// 从缓存中提取short结果
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/// </summary>
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/// <param name="buffer">缓存数据</param>
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/// <param name="index">索引位置</param>
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/// <returns>short对象</returns>
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public override short TransInt16( byte[] buffer, int index )
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{
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return base.TransInt16( ReverseBytesByWord( buffer, index, 2 ), 0 );
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}
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/// <summary>
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/// 从缓存中提取ushort结果
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/// </summary>
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/// <param name="buffer">缓存数据</param>
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/// <param name="index">索引位置</param>
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/// <returns>ushort对象</returns>
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public override ushort TransUInt16( byte[] buffer, int index )
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{
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return base.TransUInt16( ReverseBytesByWord( buffer, index, 2 ), 0 );
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}
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/// <summary>
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/// 从缓存中提取string结果,使用指定的编码
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/// </summary>
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/// <param name="buffer">缓存对象</param>
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/// <param name="index">索引位置</param>
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/// <param name="length">byte数组长度</param>
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/// <param name="encoding">字符串的编码</param>
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/// <returns>string对象</returns>
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public override string TransString( byte[] buffer, int index, int length, Encoding encoding )
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{
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byte[] tmp = TransByte( buffer, index, length );
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if(IsStringReverse)
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{
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return encoding.GetString( ReverseBytesByWord( tmp ) );
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}
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else
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{
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return encoding.GetString( tmp );
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}
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}
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#endregion
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#region Get Bytes From Value
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/// <summary>
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/// short数组变量转化缓存数据
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/// </summary>
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/// <param name="values">等待转化的数组</param>
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/// <returns>buffer数据</returns>
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public override byte[] TransByte( short[] values )
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{
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byte[] buffer = base.TransByte( values );
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return ReverseBytesByWord( buffer );
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}
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/// <summary>
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/// ushort数组变量转化缓存数据
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/// </summary>
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/// <param name="values">等待转化的数组</param>
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/// <returns>buffer数据</returns>
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public override byte[] TransByte( ushort[] values )
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{
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byte[] buffer = base.TransByte( values );
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return ReverseBytesByWord( buffer );
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}
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/// <summary>
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/// 使用指定的编码字符串转化缓存数据
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/// </summary>
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/// <param name="value">等待转化的数据</param>
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/// <param name="encoding">字符串的编码方式</param>
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/// <returns>buffer数据</returns>
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public override byte[] TransByte( string value, Encoding encoding )
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{
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if (value == null) return null;
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byte[] buffer = encoding.GetBytes( value );
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buffer = SoftBasic.ArrayExpandToLengthEven( buffer );
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if (IsStringReverse)
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{
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return ReverseBytesByWord( buffer );
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}
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else
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{
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return buffer;
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}
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}
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#endregion
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}
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}
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