67 lines
1.9 KiB
C#
67 lines
1.9 KiB
C#
using System;
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using System.IO;
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using System.Threading;
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using System.Threading.Tasks;
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namespace S7.Net
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{
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/// <summary>
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/// Describes a TPKT Packet
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/// </summary>
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internal class TPKT
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{
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public byte Version;
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public byte Reserved1;
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public int Length;
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public byte[] Data;
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private TPKT(byte version, byte reserved1, int length, byte[] data)
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{
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Version = version;
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Reserved1 = reserved1;
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Length = length;
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Data = data;
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}
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/// <summary>
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/// Reads a TPKT from the socket Async
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/// </summary>
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/// <param name="stream">The stream to read from</param>
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/// <returns>Task TPKT Instace</returns>
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public static async Task<TPKT> ReadAsync(Stream stream, CancellationToken cancellationToken)
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{
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var buf = new byte[4];
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int len = await stream.ReadExactAsync(buf, 0, 4, cancellationToken).ConfigureAwait(false);
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if (len < 4) throw new TPKTInvalidException("TPKT is incomplete / invalid");
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var version = buf[0];
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var reserved1 = buf[1];
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var length = buf[2] * 256 + buf[3]; //BigEndian
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var data = new byte[length - 4];
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len = await stream.ReadExactAsync(data, 0, data.Length, cancellationToken).ConfigureAwait(false);
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if (len < data.Length)
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throw new TPKTInvalidException("TPKT payload incomplete / invalid");
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return new TPKT
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(
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version: version,
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reserved1: reserved1,
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length: length,
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data: data
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);
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}
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public override string ToString()
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{
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return string.Format("Version: {0} Length: {1} Data: {2}",
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Version,
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Length,
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BitConverter.ToString(Data)
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);
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}
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}
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}
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