public static ConnectionRequestDatagram TranslateFromMemory(Memory <byte> data)
{
var span = data.Span;
var result = new ConnectionRequestDatagram
{
Tkpt = new TpktDatagram
{
Sync1 = span[0],
Sync2 = span[1],
Length = BinaryPrimitives.ReadUInt16BigEndian(span.Slice(2, 2))
},
Li = span[4],
PduType = span[5],
DstRef = BinaryPrimitives.ReadInt16BigEndian(span.Slice(6, 2)),
SrcRef = BinaryPrimitives.ReadInt16BigEndian(span.Slice(8, 2)),
ClassOption = span[10],
ParmCodeTpduSize = span[11],
Unknown = span[12],
SizeTpduReceiving = span[13],
};
var offset = 14;
result.ParmCodeSrcTsap = span[offset++];
result.SourceTsapLength = span[offset++];
result.SourceTsap = data.Slice(offset, (int)result.SourceTsapLength);
offset += (int)result.SourceTsapLength;
result.ParmCodeDestTsap = span[offset++];
result.DestTsapLength = span[offset++];
result.DestTsap = data.Slice(offset, result.DestTsapLength);
offset += (int)result.DestTsapLength;
return(result);
}
public static Memory <byte> TranslateToMemory(ConnectionRequestDatagram datagram)
{
var length = datagram.Tkpt.Length;
var result = new Memory <byte>(new byte[length]); // check if we could use ArrayBuffer
var span = result.Span;
span[0] = datagram.Tkpt.Sync1;
span[1] = datagram.Tkpt.Sync2;
BinaryPrimitives.WriteUInt16BigEndian(span.Slice(2, 2), datagram.Tkpt.Length);
span[4] = datagram.Li;
span[5] = datagram.PduType;
BinaryPrimitives.WriteInt16BigEndian(span.Slice(6, 2), datagram.DstRef);
BinaryPrimitives.WriteInt16BigEndian(span.Slice(8, 2), datagram.DstRef);
span[10] = datagram.ClassOption;
span[11] = datagram.ParmCodeTpduSize;
span[12] = datagram.Unknown;
span[13] = datagram.SizeTpduReceiving;
var offset = 14;
span[offset++] = datagram.ParmCodeSrcTsap;
span[offset++] = datagram.SourceTsapLength;
datagram.SourceTsap.CopyTo(result.Slice(offset));
offset += (int)datagram.SourceTsapLength;
span[offset++] = datagram.ParmCodeDestTsap;
span[offset++] = datagram.DestTsapLength;
datagram.DestTsap.CopyTo(result.Slice(offset));
offset += (int)datagram.DestTsapLength;
return(result);
}
public static bool Correlate(ConnectionRequestDatagram o1, ConnectionConfirmedDatagram o2)
{
//Test ack
if (o1.SourceTsap.Span.SequenceEqual(o2.SourceTsap.Span) && o1.DestTsap.Span.SequenceEqual(o2.DestTsap.Span))
{
return(true);
}
return(false);
}
public static ConnectionRequestDatagram BuildCr(Rfc1006ProtocolContext context)
{
context.CalcLength(context, out var li, out var length);
var result = new ConnectionRequestDatagram
{
Li = li,
SizeTpduReceiving = context.SizeTpduReceiving,
SourceTsapLength = Convert.ToByte(context.SourceTsap.Length),
SourceTsap = context.SourceTsap,
DestTsapLength = Convert.ToByte(context.DestTsap.Length),
DestTsap = context.DestTsap
};
result.Tkpt.Length = length;
return(result);
}
public ConnectionConfirmedDatagram BuildCc(Rfc1006ProtocolContext context, ConnectionRequestDatagram req)
{
context.CalcLength(context, out byte li, out ushort length);
context.SizeTpduSending = req.SizeTpduReceiving;
var result = new ConnectionConfirmedDatagram
{
Li = li,
SizeTpduReceiving = context.SizeTpduReceiving,
SourceTsapLength = req.DestTsapLength,
SourceTsap = req.SourceTsap,
DestTsapLength = req.DestTsapLength,
DestTsap = req.DestTsap
};
result.Tkpt.Length = length;
return(result);
}
public static IMemoryOwner <byte> TranslateToMemory(ConnectionRequestDatagram datagram, out int memoryLength)
{
var length = memoryLength = datagram.Tkpt.Length;
var result = MemoryPool <byte> .Shared.Rent(length); // check if we could use ArrayBuffer
var mem = result.Memory;
var span = mem.Span;
span[0] = datagram.Tkpt.Sync1;
span[1] = datagram.Tkpt.Sync2;
BinaryPrimitives.WriteUInt16BigEndian(span.Slice(2, 2), datagram.Tkpt.Length);
span[4] = datagram.Li;
span[5] = datagram.PduType;
BinaryPrimitives.WriteInt16BigEndian(span.Slice(6, 2), datagram.DstRef);
BinaryPrimitives.WriteInt16BigEndian(span.Slice(8, 2), datagram.SrcRef);
span[10] = datagram.ClassOption;
var offset = 11;
span[offset++] = datagram.ParmCodeTpduSize;
span[offset++] = datagram.SizeTpduReceivingLength;
datagram.SizeTpduReceiving.CopyTo(mem.Slice(offset));
offset += datagram.SizeTpduReceivingLength;
span[offset++] = datagram.ParmCodeSrcTsap;
span[offset++] = datagram.SourceTsapLength;
datagram.SourceTsap.CopyTo(mem.Slice(offset));
offset += datagram.SourceTsapLength;
span[offset++] = datagram.ParmCodeDestTsap;
span[offset++] = datagram.DestTsapLength;
datagram.DestTsap.CopyTo(mem.Slice(offset));
//offset += datagram.DestTsapLength;
return(result);
}
public static ConnectionRequestDatagram TranslateFromMemory(Memory <byte> data, out int processed)
{
var span = data.Span;
var result = new ConnectionRequestDatagram
{
Tkpt = new TpktDatagram
{
Sync1 = span[0],
Sync2 = span[1],
Length = BinaryPrimitives.ReadUInt16BigEndian(span.Slice(2, 2))
},
Li = span[4],
PduType = span[5],
DstRef = BinaryPrimitives.ReadInt16BigEndian(span.Slice(6, 2)),
SrcRef = BinaryPrimitives.ReadInt16BigEndian(span.Slice(8, 2)),
ClassOption = span[10]
};
int offset;
for (offset = 11; offset < data.Length;)
{
switch (span[offset])
{
case 0xc0:
{
result.ParmCodeTpduSize = span[offset++];
result.SizeTpduReceivingLength = span[offset++];
result._sizeTpduReceiving = MemoryPool <byte> .Shared.Rent(result.SizeTpduReceivingLength);
data.Slice(offset, result.SizeTpduReceivingLength).CopyTo(result._sizeTpduReceiving.Memory);
result.SizeTpduReceiving = result._sizeTpduReceiving.Memory.Slice(0, result.SizeTpduReceivingLength);
offset += result.SizeTpduReceivingLength;
}
break;
case 0xc1:
{
result.ParmCodeSrcTsap = span[offset++];
result.SourceTsapLength = span[offset++];
result._sourceTsap = MemoryPool <byte> .Shared.Rent(result.SourceTsapLength);
data.Slice(offset, result.SourceTsapLength).CopyTo(result._sourceTsap.Memory);
result.SourceTsap = result._sourceTsap.Memory.Slice(0, result.SourceTsapLength);
offset += result.SourceTsapLength;
}
break;
case 0xc2:
{
result.ParmCodeDestTsap = span[offset++];
result.DestTsapLength = span[offset++];
result._destTsap = MemoryPool <byte> .Shared.Rent(result.DestTsapLength);
data.Slice(offset, result.DestTsapLength).CopyTo(result._destTsap.Memory);
result.DestTsap = result._destTsap.Memory.Slice(0, result.DestTsapLength);
offset += result.DestTsapLength;
}
break;
default:
break;
}
}
processed = offset;
return(result);
}
