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Revert "Merge pull request #107 from thoj/master"

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This reverts commit d17fdf8efb, reversing
changes made to bfeacee08f.
This commit is contained in:
Michele Cattafesta
2018-04-11 20:22:24 +01:00
parent d17fdf8efb
commit 9fd515280a
4 changed files with 40 additions and 203 deletions
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94
S7.Net/COTP.cs
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@@ -1,94 +0,0 @@
using System;
using System.IO;
using System.Net.Sockets;
namespace S7.Net
{
/// <summary>
/// COTP Protocol functions and types
/// </summary>
internal class COTP
{
/// <summary>
/// Describes a COTP TPDU (Transport protocol data unit)
/// </summary>
public class TPDU
{
public byte HeaderLength;
public byte PDUType;
public int TPDUNumber;
public byte[] Data;
public bool LastDataUnit;
public TPDU(TPKT tPKT)
{
var br = new BinaryReader(new MemoryStream(tPKT.Data));
HeaderLength = br.ReadByte();
if (HeaderLength >= 2)
{
PDUType = br.ReadByte();
if (PDUType == 0xf0) //DT Data
{
var flags = br.ReadByte();
TPDUNumber = flags & 0x7F;
LastDataUnit = (flags & 0x80) > 0;
Data = br.ReadBytes(tPKT.Length - HeaderLength - 4); //4 = TPKT Size
return;
}
//TODO: Handle other PDUTypes
}
Data = new byte[0];
}
/// <summary>
/// Reads COTP TPDU (Transport protocol data unit) from the network stream
/// See: https://tools.ietf.org/html/rfc905
/// </summary>
/// <param name="socket">The socket to read from</param>
/// <returns>COTP DPDU instance</returns>
public static TPDU Read(Socket socket)
{
var tpkt = TPKT.Read(socket);
return new TPDU(tpkt);
}
public override string ToString()
{
return string.Format("Length: {0} PDUType: {1} TPDUNumber: {2} Last: {3} Segment Data: {4}",
HeaderLength,
PDUType,
TPDUNumber,
LastDataUnit,
BitConverter.ToString(Data)
);
}
}
/// <summary>
/// Describes a COTP TSDU (Transport service data unit). One TSDU consist of 1 ore more TPDUs
/// </summary>
public class TSDU
{
/// <summary>
/// Reads the full COTP TSDU (Transport service data unit)
/// See: https://tools.ietf.org/html/rfc905
/// </summary>
/// <returns>Data in TSDU</returns>
public static byte[] Read(Socket socket)
{
var segment = TPDU.Read(socket);
var output = new MemoryStream(segment.Data.Length);
output.Write(segment.Data, 0, segment.Data.Length);
while (!segment.LastDataUnit)
{
segment = TPDU.Read(socket);
output.Write(segment.Data, (int)output.Position, segment.Data.Length);
}
return output.GetBuffer();
}
}
}
}