104 lines
3.3 KiB
C#
104 lines
3.3 KiB
C#
using System;
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using DTS.Common.Interface.DASFactory.Config;
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using DTS.Common.Utilities;
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namespace DTS.DASLib.Service
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{
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/// <summary>
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/// A class to represent a sensor Electronic ID.
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/// </summary>
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[Serializable]
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public class EID : IEID, IComparable<EID>, IComparable<string>
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{
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static readonly byte[] CRCTable = { 0, 94,188,226, 97, 63,221,131,194,156,126, 32,163,253, 31, 65,
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157,195, 33,127,252,162, 64, 30, 95, 1,227,189, 62, 96,130,220,
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35,125,159,193, 66, 28,254,160,225,191, 93, 3,128,222, 60, 98,
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190,224, 2, 92,223,129, 99, 61,124, 34,192,158, 29, 67,161,255,
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70, 24,250,164, 39,121,155,197,132,218, 56,102,229,187, 89, 7,
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219,133,103, 57,186,228, 6, 88, 25, 71,165,251,120, 38,196,154,
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101, 59,217,135, 4, 90,184,230,167,249, 27, 69,198,152,122, 36,
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248,166, 68, 26,153,199, 37,123, 58,100,134,216, 91, 5,231,185,
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140,210, 48,110,237,179, 81, 15, 78, 16,242,172, 47,113,147,205,
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17, 79,173,243,112, 46,204,146,211,141,111, 49,178,236, 14, 80,
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175,241, 19, 77,206,144,114, 44,109, 51,209,143, 12, 82,176,238,
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50,108,142,208, 83, 13,239,177,240,174, 76, 18,145,207, 45,115,
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202,148,118, 40,171,245, 23, 73, 8, 86,180,234,105, 55,213,139,
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87, 9,235,181, 54,104,138,212,149,203, 41,119,244,170, 72, 22,
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233,183, 85, 11,136,214, 52,106, 43,117,151,201, 74, 20,246,168,
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116, 42,200,150, 21, 75,169,247,182,232, 10, 84,215,137,107, 53};
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public string ID { get; set; }
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public byte[] Blob { get; set; }
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public int CompareTo(EID eid)
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{
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return ID.ToUpper().CompareTo(eid.ID.ToUpper());
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}
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public int CompareTo(string eidStr)
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{
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return ID.ToUpper().CompareTo(eidStr.ToUpper());
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}
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public EID()
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{
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ID = "";
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Blob = null;
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}
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public EID(string _id)
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{
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ID = _id;
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Blob = null;
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}
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public EID(string _id, byte[] _blob)
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{
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ID = _id;
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Blob = _blob;
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}
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public bool IsValid()
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{
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// it can't be empty
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if (string.IsNullOrEmpty(ID))
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return false;
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// it must be 16 characters
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if (ID.Length != 16)
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return false;
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// it can't be all 0's
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if (EIDReader.IsBlankID(ID)) { return false; }
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// it must be in HEX
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if (!HexEncoding.InHexFormat(ID))
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return false;
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// extract the CRC
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int garbage;
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var hex = HexEncoding.GetBytes(ID.Substring(0, 2), out garbage);
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var crc = hex[0];
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// calculate the CRC
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hex = HexEncoding.GetBytes(ID.Substring(2), out garbage);
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var idCRC = ComputeCRC8(hex);
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// is the CRC good?
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return idCRC == crc;
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}
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private byte ComputeCRC8(byte[] input)
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{
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byte crc = 0;
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for (int idx = input.Length - 1; idx >= 0; idx--)
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{
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crc = CRCTable[crc ^ input[idx]];
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}
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return crc;
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}
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}
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}
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