internal abstract ModbusRequest DeserializeRequest(RequestBuffer buffer);
internal override ModbusRequest DeserializeRequest(RequestBuffer buffer)
{
ModbusRequest result = null;
while (!buffer.Channel.IsDisposed)
{
if (errorBuffer.Count >= 256)
{
RaiseUnrecognized(buffer.Channel, errorBuffer.ToArray());
errorBuffer.Clear();
}
while (buffer.Count < 8 && !buffer.Channel.IsDisposed)
{
buffer.Read();
}
if (buffer.Channel.IsDisposed)
{
break;
}
var slaveAddress = buffer[0];
int messageLength = 0;
if (buffer.ModbusSlave.IsValidSlaveAddress(slaveAddress, buffer.Channel) &&
Enum.IsDefined(typeof(ModbusFunction), buffer[1]))
{
ModbusFunction function = (ModbusFunction)buffer[1];
var address = ToUInt16(buffer, 2);
var valueOrLength = ToUInt16(buffer, 4);
switch (function)
{
case ModbusFunction.ReadCoils:
case ModbusFunction.ReadDiscreteInputs:
case ModbusFunction.ReadHoldingRegisters:
case ModbusFunction.ReadInputRegisters:
case ModbusFunction.WriteSingleCoil:
case ModbusFunction.WriteSingleHoldingRegister:
if (CalculateCrc(buffer.Take(6)).SequenceEqual(buffer.Skip(6).Take(2)))
{
messageLength = 8;
switch (function)
{
case ModbusFunction.ReadCoils:
case ModbusFunction.ReadDiscreteInputs:
case ModbusFunction.ReadHoldingRegisters:
case ModbusFunction.ReadInputRegisters:
result = new ModbusReadRequest(slaveAddress, (ModbusObjectType)(byte)function, address, valueOrLength);
break;
case ModbusFunction.WriteSingleCoil:
if (valueOrLength != 0xff00 && valueOrLength != 0)
{
result = new ModbusWriteCoilRequest(slaveAddress, address);
}
else
{
result = new ModbusWriteCoilRequest(slaveAddress, address, valueOrLength == 0xff00);
}
break;
case ModbusFunction.WriteSingleHoldingRegister:
result = new ModbusWriteHoldingRegisterRequest(slaveAddress, address, valueOrLength);
break;
}
}
break;
case ModbusFunction.WriteMultipleCoils:
case ModbusFunction.WriteMultipleHoldingRegisters:
if (buffer.Count < 7 && !buffer.Channel.IsDisposed)
{
buffer.Read();
}
if (buffer.Channel.IsDisposed)
{
break;
}
var byteLength = buffer[6];
messageLength = byteLength + 9;
if (function == ModbusFunction.WriteMultipleCoils && byteLength == Math.Ceiling(valueOrLength / 8d) ||
function == ModbusFunction.WriteMultipleHoldingRegisters && byteLength == valueOrLength * 2)
{
while (buffer.Count < messageLength && !buffer.Channel.IsDisposed)
{
buffer.Read();
}
if (buffer.Channel.IsDisposed)
{
break;
}
if (CalculateCrc(buffer.Take(byteLength + 7)).SequenceEqual(buffer.Skip(byteLength + 7).Take(2)))
{
switch (function)
{
case ModbusFunction.WriteMultipleCoils:
result = new ModbusWriteCoilRequest(slaveAddress, address, buffer.Skip(7).Take(byteLength).SelectMany(b => ByteToBooleanArray(b)).Take(valueOrLength).ToArray());
break;
case ModbusFunction.WriteMultipleHoldingRegisters:
result = new ModbusWriteHoldingRegisterRequest(slaveAddress, address, buffer.Skip(7).Take(byteLength).ToArray());
break;
}
}
}
break;
}
}
if (result != null)
{
if (errorBuffer.Count > 0)
{
RaiseUnrecognized(buffer.Channel, errorBuffer.ToArray());
errorBuffer.Clear();
}
return(result);
}
else
{
errorBuffer.Add(buffer[0]);
buffer.RemoveAt(0);
continue;
}
}
return(null);
}
internal ModbusRequest Deserialize(RequestBuffer buffer)
{
return(DeserializeRequest(buffer));
}
internal override ModbusRequest DeserializeRequest(RequestBuffer rawBuffer)
{
ModbusRequest result = null;
while (!rawBuffer.Channel.IsDisposed)
{
if (errorBuffer.Count >= 256)
{
RaiseUnrecognized(rawBuffer.Channel, errorBuffer.ToArray());
errorBuffer.Clear();
}
while (rawBuffer.Count < 17 && !rawBuffer.Channel.IsDisposed)
{
rawBuffer.Read();
}
if (rawBuffer.Channel.IsDisposed)
{
break;
}
int messageLength = 0;
if (rawBuffer[0] == 0x3a)
{
List <byte> buffer = new List <byte>();
for (int i = 0; i < 7; i++)
{
if (TryParseFromHex(rawBuffer, i * 2 + 1, out var byteValue))
{
buffer.Add(byteValue);
}
else
{
break;
}
}
if (buffer.Count < 7)
{
errorBuffer.AddRange(rawBuffer.Take((buffer.Count + 1) * 2 + 1));
rawBuffer.RemoveRange(0, (buffer.Count + 1) * 2 + 1);
continue;
}
var slaveAddress = buffer[0];
if (rawBuffer.ModbusSlave.IsValidSlaveAddress(slaveAddress, rawBuffer.Channel) &&
Enum.IsDefined(typeof(ModbusFunction), buffer[1]))
{
ModbusFunction function = (ModbusFunction)buffer[1];
var address = ToUInt16(buffer, 2);
var valueOrLength = ToUInt16(buffer, 4);
switch (function)
{
case ModbusFunction.ReadCoils:
case ModbusFunction.ReadDiscreteInputs:
case ModbusFunction.ReadHoldingRegisters:
case ModbusFunction.ReadInputRegisters:
case ModbusFunction.WriteSingleCoil:
case ModbusFunction.WriteSingleHoldingRegister:
if ((-buffer.Take(6).Sum(b => b) & 0xff) == buffer[6] &&
rawBuffer[15] == '\r' && rawBuffer[16] == '\n')
{
messageLength = 17;
switch (function)
{
case ModbusFunction.ReadCoils:
case ModbusFunction.ReadDiscreteInputs:
case ModbusFunction.ReadHoldingRegisters:
case ModbusFunction.ReadInputRegisters:
result = new ModbusReadRequest(slaveAddress, (ModbusObjectType)(byte)function, address, valueOrLength);
break;
case ModbusFunction.WriteSingleCoil:
if (valueOrLength != 0xff00 && valueOrLength != 0)
{
result = new ModbusWriteCoilRequest(slaveAddress, address);
}
else
{
result = new ModbusWriteCoilRequest(slaveAddress, address, valueOrLength == 0xff00);
}
break;
case ModbusFunction.WriteSingleHoldingRegister:
result = new ModbusWriteHoldingRegisterRequest(slaveAddress, address, valueOrLength);
break;
}
}
break;
case ModbusFunction.WriteMultipleCoils:
case ModbusFunction.WriteMultipleHoldingRegisters:
var byteLength = buffer[6];
messageLength = byteLength * 2 + 19;
if (function == ModbusFunction.WriteMultipleCoils && byteLength == Math.Ceiling(valueOrLength / 8d) ||
function == ModbusFunction.WriteMultipleHoldingRegisters && byteLength == valueOrLength * 2)
{
while (rawBuffer.Count < messageLength && !rawBuffer.Channel.IsDisposed)
{
rawBuffer.Read();
}
if (rawBuffer.Channel.IsDisposed)
{
break;
}
for (int i = 0; i < byteLength + 1; i++)
{
if (TryParseFromHex(rawBuffer, i * 2 + 15, out var byteValue))
{
buffer.Add(byteValue);
}
else
{
break;
}
}
if (buffer.Count < 8 + byteLength)
{
errorBuffer.AddRange(rawBuffer.Take((buffer.Count + 1) * 2 + 1));
rawBuffer.RemoveRange(0, (buffer.Count + 1) * 2 + 1);
continue;
}
if ((-buffer.Take(7 + byteLength).Sum(b => b) & 0xff) == buffer[6] &&
rawBuffer[15] == '\r' && rawBuffer[16] == '\n')
{
switch (function)
{
case ModbusFunction.WriteMultipleCoils:
result = new ModbusWriteCoilRequest(slaveAddress, address, buffer.Skip(7).Take(byteLength).SelectMany(b => ByteToBooleanArray(b)).Take(valueOrLength).ToArray());
break;
case ModbusFunction.WriteMultipleHoldingRegisters:
result = new ModbusWriteHoldingRegisterRequest(slaveAddress, address, buffer.Skip(7).Take(byteLength).ToArray());
break;
}
}
}
break;
}
}
}
if (result != null)
{
if (errorBuffer.Count > 0)
{
RaiseUnrecognized(rawBuffer.Channel, errorBuffer.ToArray());
errorBuffer.Clear();
}
return(result);
}
else
{
errorBuffer.Add(rawBuffer[0]);
rawBuffer.RemoveAt(0);
continue;
}
}
return(null);
}
