protected virtual void WriteAttribute(ServiceAttribute attr, byte[] buffer, ref int offset)
{
int len;
len = CreateAttrId(attr.Id, buffer, offset);
offset += len;
len = CreateElement(attr.Value, buffer, offset);
offset += len;
}
static ServiceElement GetChannelElement(ServiceRecord record, BluetoothProtocolDescriptorType proto)
{
if (!record.Contains(UniversalAttributeId.ProtocolDescriptorList))
{
goto NotFound;
}
ServiceAttribute attr = record.GetAttributeById(UniversalAttributeId.ProtocolDescriptorList);
bool?isSimpleRfcomm;
return(GetChannelElement(attr, proto, out isSimpleRfcomm));
NotFound:
return(null);
}
// TODO GetRfcommChannelElement(ServiceAttribute attr) Could be public -> Tests!
internal static ServiceElement GetChannelElement(ServiceAttribute attr,
BluetoothProtocolDescriptorType proto,
out bool?isSimpleRfcomm)
{
if (proto != BluetoothProtocolDescriptorType.L2Cap &&
proto != BluetoothProtocolDescriptorType.Rfcomm)
{
throw new ArgumentException("Can only fetch RFCOMM or L2CAP element.");
}
//
isSimpleRfcomm = true;
Debug.Assert(attr != null, "attr != null");
ServiceElement e0 = attr.Value;
if (e0.ElementType == ElementType.ElementAlternative)
{
Trace.WriteLine("Don't support ElementAlternative ProtocolDescriptorList values.");
goto NotFound;
}
else if (e0.ElementType != ElementType.ElementSequence)
{
Trace.WriteLine("Bad ProtocolDescriptorList base element.");
goto NotFound;
}
IList <ServiceElement> protoStack = e0.GetValueAsElementList();
IEnumerator <ServiceElement> etor = protoStack.GetEnumerator();
ServiceElement layer;
IList <ServiceElement> layerContent;
ServiceElement channelElement;
// -- L2CAP Layer --
if (!etor.MoveNext())
{
Trace.WriteLine(string.Format(CultureInfo.InvariantCulture,
"Protocol stack truncated before {0}.", "L2CAP"));
goto NotFound;
}
layer = etor.Current; //cast here are for non-Generic version.
layerContent = layer.GetValueAsElementList();
if (layerContent[0].GetValueAsUuid() != BluetoothProtocol.L2CapProtocol)
{
Trace.WriteLine(String.Format(CultureInfo.InvariantCulture,
"Bad protocol stack, layer {0} is not {1}.", 1, "L2CAP"));
goto NotFound;
}
bool hasPsmEtc = layerContent.Count != 1;
// Cast for FX1.1 object
isSimpleRfcomm = (bool)isSimpleRfcomm && !hasPsmEtc;
if (proto == BluetoothProtocolDescriptorType.L2Cap)
{
if (layerContent.Count < 2)
{
Trace.WriteLine("L2CAP PSM element was requested but the L2CAP layer in this case hasn't a second element.");
goto NotFound;
}
channelElement = (ServiceElement)layerContent[1];
goto Success;
}
//
// -- RFCOMM Layer --
if (!etor.MoveNext())
{
Trace.WriteLine(string.Format(CultureInfo.InvariantCulture,
"Protocol stack truncated before {0}.", "RFCOMM"));
goto NotFound;
}
layer = etor.Current;
layerContent = layer.GetValueAsElementList();
if (layerContent[0].GetValueAsUuid() != BluetoothProtocol.RFCommProtocol)
{
Trace.WriteLine(String.Format(CultureInfo.InvariantCulture,
"Bad protocol stack, layer {0} is not {1}.", 2, "RFCOMM"));
goto NotFound;
}
//
if (layerContent.Count < 2)
{
Trace.WriteLine(String.Format(CultureInfo.InvariantCulture,
"Bad protocol stack, layer {0} hasn't a second element.", 2));
goto NotFound;
}
channelElement = (ServiceElement)layerContent[1];
if (channelElement.ElementType != ElementType.UInt8)
{
Trace.WriteLine(String.Format(CultureInfo.InvariantCulture,
"Bad protocol stack, layer {0} is not UInt8.", 2));
goto NotFound;
}
// Success
//
// -- Any remaining layer(s) --
bool extraLayers = etor.MoveNext();
isSimpleRfcomm = (bool)isSimpleRfcomm && !extraLayers;
Success:
//
return(channelElement);
NotFound:
isSimpleRfcomm = null;
return(null);
}
private static string GetIdString(ServiceAttribute attribute)
{
return($"0x{attribute.Id:X}");
}
/// <overloads>
/// Add a custom attribute.
/// </overloads>
/// -
/// <summary>
/// Add a custom attribute from a given <see cref="T:InTheHand.Net.Bluetooth.ServiceAttribute"/>
/// </summary>
/// -
/// <param name="serviceAttribute">An attribute as a
/// <see cref="T:InTheHand.Net.Bluetooth.ServiceAttribute"/> instance.
/// </param>
public void AddCustomAttribute(ServiceAttribute serviceAttribute)
{
this.AddCustomAttributes(new ServiceAttribute[] { serviceAttribute });
}
