public static S7UserDataParameter TranslateFromMemory(Memory <byte> data)
{
var span = data.Span;
var result = new S7UserDataParameter();
span.Slice(0, 3).CopyTo(result.ParamHeader);
result.ParamDataLength = span[3];
result.ParameterType = span[4];
result.TypeAndGroup = span[5];
result.SubFunction = span[6];
result.SequenceNumber = span[7];
if (result.ParamDataLength == 0x08)
{
result.DataUnitReferenceNumber = span[8];
result.LastDataUnit = span[9];
result.ParamErrorCode = BinaryPrimitives.ReadUInt16BigEndian(span.Slice(10, 2));
}
return(result);
}
public static Memory <byte> TranslateToMemory(S7UserDataParameter datagram, Memory <byte> memory)
{
var result = memory.IsEmpty ? new Memory <byte>(new byte[datagram.ParamDataLength]) : memory; // check if we could use ArrayBuffer
var span = result.Span;
datagram.ParamHeader.CopyTo(span.Slice(0, 3));
span[3] = datagram.ParamDataLength;
span[4] = datagram.ParameterType;
span[5] = datagram.TypeAndGroup;
span[6] = datagram.SubFunction;
span[7] = datagram.SequenceNumber;
if (datagram.ParamDataLength == 0x08)
{
span[8] = datagram.DataUnitReferenceNumber;
span[9] = datagram.LastDataUnit;
BinaryPrimitives.WriteUInt16BigEndian(span.Slice(10, 2), datagram.ParamErrorCode);
}
return(result);
}