public static void Encode(EncodeBuffer buffer, BacnetNpduControls function, BacnetAddress destination,
BacnetAddress source, byte hopCount, BacnetNetworkMessageTypes networkMsgType, ushort vendorId)
{
Encode(buffer, function, destination, source, hopCount);
if (function.HasFlag(BacnetNpduControls.NetworkLayerMessage)) // sure it is, otherwise the other Encode is used
{
buffer.buffer[buffer.offset++] = (byte)networkMsgType;
if ((byte)networkMsgType >= 0x80) // who used this ??? sure nobody !
{
buffer.buffer[buffer.offset++] = (byte)((vendorId & 0xFF00) >> 8);
buffer.buffer[buffer.offset++] = (byte)((vendorId & 0x00FF) >> 0);
}
}
}
public static int Decode(byte[] buffer, int offset, out BacnetNpduControls function, out BacnetAddress destination,
out BacnetAddress source, out byte hopCount, out BacnetNetworkMessageTypes networkMsgType, out ushort vendorId)
{
var orgOffset = offset;
offset++;
function = (BacnetNpduControls)buffer[offset++];
destination = null;
if ((function & BacnetNpduControls.DestinationSpecified) == BacnetNpduControls.DestinationSpecified)
{
destination = new BacnetAddress(BacnetAddressTypes.None, (ushort)((buffer[offset++] << 8) | (buffer[offset++] << 0)), null);
int adrLen = buffer[offset++];
if (adrLen > 0)
{
destination.adr = new byte[adrLen];
for (var i = 0; i < destination.adr.Length; i++)
{
destination.adr[i] = buffer[offset++];
}
}
}
source = null;
if ((function & BacnetNpduControls.SourceSpecified) == BacnetNpduControls.SourceSpecified)
{
source = new BacnetAddress(BacnetAddressTypes.None, (ushort)((buffer[offset++] << 8) | (buffer[offset++] << 0)), null);
int adrLen = buffer[offset++];
if (adrLen > 0)
{
source.adr = new byte[adrLen];
for (var i = 0; i < source.adr.Length; i++)
{
source.adr[i] = buffer[offset++];
}
}
}
hopCount = 0;
if ((function & BacnetNpduControls.DestinationSpecified) == BacnetNpduControls.DestinationSpecified)
{
hopCount = buffer[offset++];
}
networkMsgType = BacnetNetworkMessageTypes.NETWORK_MESSAGE_WHO_IS_ROUTER_TO_NETWORK;
vendorId = 0;
if (function.HasFlag(BacnetNpduControls.NetworkLayerMessage))
{
networkMsgType = (BacnetNetworkMessageTypes)buffer[offset++];
if ((byte)networkMsgType >= 0x80)
{
vendorId = (ushort)((buffer[offset++] << 8) | (buffer[offset++] << 0));
}
else if (networkMsgType == BacnetNetworkMessageTypes.NETWORK_MESSAGE_WHO_IS_ROUTER_TO_NETWORK)
{
offset += 2; // Don't care about destination network adress
}
}
if (buffer[orgOffset + 0] != BACNET_PROTOCOL_VERSION)
{
return(-1);
}
return(offset - orgOffset);
}
