private void addOperandAddress(UnitronicsPLC plc, OperandType type, ushort address)
{
ushort maximumAddress = plc.GetMaximumOperandAddress(type) ?? ushort.MaxValue;
if (isBitOperandType(type))
{
if (_operandRequests.ContainsKey(type) == false)
{
VectorialOperandRequest newRequest = new VectorialOperandRequest(type, address, 8);
if (newRequest.EndAddress > maximumAddress)
{
newRequest.StartAddress = (ushort)(maximumAddress - 7);
}
_operandRequests.Add(type, newRequest);
return;
}
if (_operandRequests.TryGetValue(type, out IOperandRequest genericRequest) && genericRequest is VectorialOperandRequest existingRequest)
{
if (address >= existingRequest.StartAddress && address > existingRequest.EndAddress)
{
existingRequest.Count = (ushort)(address - existingRequest.StartAddress + 1);
}
if (existingRequest.Count % 8 != 0)
{
existingRequest.Count = (ushort)(existingRequest.Count + (8 - (existingRequest.Count % 8)));
}
if (existingRequest.EndAddress > maximumAddress)
{
existingRequest.StartAddress -= (ushort)(existingRequest.EndAddress - maximumAddress);
}
}
}
else
{
if (_operandRequests.ContainsKey(type) == false)
{
_operandRequests.Add(type, new NonVectorialOperandRequest(type));
}
if (_operandRequests.TryGetValue(type, out IOperandRequest genericRequest) && genericRequest is NonVectorialOperandRequest request && request.Addresses.Contains(address) == false)
{
request.Addresses.Add(address);
}
}
}
private bool newOperandAddressFitsBuffer(OperandType type, ushort address, ushort maximumBufferSize)
{
ushort requestBufferSize = calculateRequestBufferSize();
ushort responseBufferSize = calculateResponseBufferSize();
byte operandByteLength = calculateOperandByteLength(type);
if (operandByteLength < 2)
{
operandByteLength = 2;
}
if (_operandRequests.ContainsKey(type) == false)
{
if (requestBufferSize + 6 > maximumBufferSize || responseBufferSize + operandByteLength > maximumBufferSize)
{
return(false);
}
return(true);
}
if (_operandRequests.TryGetValue(type, out IOperandRequest genericRequest) == false)
{
return(false);
}
if (isBitOperandType(type))
{
if (genericRequest is not VectorialOperandRequest)
{
return(false);
}
VectorialOperandRequest request = (VectorialOperandRequest)genericRequest;
if (address < request.StartAddress)
{
return(false);
}
if (address >= request.StartAddress + request.Count)
{
int additionalBitCount = address - request.StartAddress - request.Count + 1;
if (request.Count % 8 != 0)
{
additionalBitCount -= 8 - (request.Count % 8);
}
if (additionalBitCount <= 0)
{
return(true);
}
int additionalBytes = additionalBitCount / 8;
if (additionalBitCount % 8 != 0)
{
additionalBytes += 1;
}
int currentBytes = request.Count / 8;
if (request.Count % 8 != 0)
{
currentBytes += 1;
}
if ((currentBytes + additionalBytes) % 2 != 0)
{
additionalBytes += 1;
}
if (responseBufferSize + additionalBytes > maximumBufferSize)
{
return(false);
}
}
}
else
{
if (genericRequest is not NonVectorialOperandRequest)
{
return(false);
}
NonVectorialOperandRequest request = (NonVectorialOperandRequest)genericRequest;
if (request.Addresses.Contains(address))
{
return(true);
}
if (requestBufferSize + 2 > maximumBufferSize || responseBufferSize + operandByteLength > maximumBufferSize)
{
return(false);
}
}
return(true);
}
