public CoapMessageOption(CoapMessageOptionNumber number, CoapMessageOptionValue value)
{
Number = number;
Value = value ?? throw new ArgumentNullException(nameof(value));
}
void EncodeOptions(IEnumerable <CoapMessageOption> options, CoapMessageWriter writer)
{
if (options == null)
{
return;
}
CoapMessageOptionNumber previousOptionNumber = 0;
foreach (var option in options.OrderBy(o => o.Number))
{
// As per RFC: Only the delta of the option number is stored.
var delta = option.Number - previousOptionNumber;
previousOptionNumber = option.Number;
byte[] value;
if (option.Value is CoapMessageOptionEmptyValue)
{
value = _emptyArray;
}
else if (option.Value is CoapMessageOptionUintValue uintValue)
{
value = EncodeUintOptioNValue(uintValue.Value);
}
else if (option.Value is CoapMessageOptionStringValue stringValue)
{
value = System.Text.Encoding.UTF8.GetBytes(stringValue.Value);
}
else if (option.Value is CoapMessageOptionOpaqueValue opaqueValue)
{
value = opaqueValue.Value;
}
else
{
throw new CoapProtocolViolationException("The specified option is not supported.");
}
var length = value.Length;
EncodeOptionValue(delta, out var deltaNibble);
writer.WriteBits(deltaNibble, 4);
EncodeOptionValue(length, out var lengthNibble);
writer.WriteBits(lengthNibble, 4);
if (deltaNibble == 13)
{
writer.WriteBits(delta - 13, 8);
}
else if (deltaNibble == 14)
{
writer.WriteBits(delta - 269, 16);
}
if (lengthNibble == 13)
{
writer.WriteBits(length - 13, 8);
}
else if (lengthNibble == 14)
{
writer.WriteBits(length - 269, 16);
}
if (value.Length > 0)
{
writer.WriteBytes(value);
}
}
}
CoapMessageOption CreateOption(CoapMessageOptionNumber number, byte[] value)
{
if (number == CoapMessageOptionNumber.IfMatch)
{
return(_optionFactory.CreateIfMatch(value));
}
if (number == CoapMessageOptionNumber.UriHost)
{
return(_optionFactory.CreateUriHost(System.Text.Encoding.UTF8.GetString(value)));
}
if (number == CoapMessageOptionNumber.ETag)
{
return(_optionFactory.CreateETag(value));
}
if (number == CoapMessageOptionNumber.IfNoneMatch)
{
return(_optionFactory.CreateIfNoneMatch());
}
if (number == CoapMessageOptionNumber.UriPort)
{
return(_optionFactory.CreateUriPort(DecodeUintOptionValue(value)));
}
if (number == CoapMessageOptionNumber.LocationPath)
{
return(_optionFactory.CreateLocationPath(System.Text.Encoding.UTF8.GetString(value)));
}
if (number == CoapMessageOptionNumber.UriPath)
{
return(_optionFactory.CreateUriPath(System.Text.Encoding.UTF8.GetString(value)));
}
if (number == CoapMessageOptionNumber.ContentFormat)
{
return(_optionFactory.CreateContentFormat((CoapMessageContentFormat)DecodeUintOptionValue(value)));
}
if (number == CoapMessageOptionNumber.MaxAge)
{
return(_optionFactory.CreateMaxAge(DecodeUintOptionValue(value)));
}
if (number == CoapMessageOptionNumber.UriQuery)
{
return(_optionFactory.CreateUriQuery(System.Text.Encoding.UTF8.GetString(value)));
}
if (number == CoapMessageOptionNumber.Accept)
{
return(_optionFactory.CreateAccept(DecodeUintOptionValue(value)));
}
if (number == CoapMessageOptionNumber.LocationQuery)
{
return(_optionFactory.CreateLocationQuery(System.Text.Encoding.UTF8.GetString(value)));
}
if (number == CoapMessageOptionNumber.ProxyUri)
{
return(_optionFactory.CreateProxyUri(System.Text.Encoding.UTF8.GetString(value)));
}
if (number == CoapMessageOptionNumber.ProxyScheme)
{
return(_optionFactory.CreateProxyScheme(System.Text.Encoding.UTF8.GetString(value)));
}
if (number == CoapMessageOptionNumber.Size1)
{
return(_optionFactory.CreateSize1(DecodeUintOptionValue(value)));
}
if (number == CoapMessageOptionNumber.Block1)
{
return(_optionFactory.CreateBlock1(DecodeUintOptionValue(value)));
}
if (number == CoapMessageOptionNumber.Block2)
{
return(_optionFactory.CreateBlock2(DecodeUintOptionValue(value)));
}
if (number == CoapMessageOptionNumber.Observe)
{
return(_optionFactory.CreateObserve(DecodeUintOptionValue(value)));
}
_logger.Warning(nameof(CoapMessageDecoder), "Invalid message: CoAP option number {0} not supported.", number);
// We do not throw because new RFCs might use new options. We wrap unknown ones
// into a opaque value.
return(new CoapMessageOption(number, new CoapMessageOptionOpaqueValue(value)));
}
