/// <overloads>
/// Creates a Service Record byte array from the given
/// <see cref="ServiceRecord"/> object.
/// </overloads>
/// -
/// <summary>
/// Creates a Service Record byte array from the given
/// <see cref="ServiceRecord"/> object,
/// into the specified byte array.
/// </summary>
/// -
/// <remarks>
/// See the other overload <see cref="ServiceRecordCreator.CreateServiceRecord(ServiceRecord)"/>
/// </remarks>
/// -
/// <param name="record">An instance of <see cref="ServiceRecord"/>
/// containing the record to be created.
/// </param>
/// <param name="buffer">An array of <see cref="byte"/> for the record
/// to be written to.
/// </param>
/// -
/// <exception cref="ArgumentOutOfRangeException">
/// The record bytes are longer that the supplied byte array buffer.
/// </exception>
/// -
/// <returns>The length of the record in the array of <see cref="T:System.Byte"/>.
/// </returns>
public int CreateServiceRecord(ServiceRecord record, byte[] buffer)
{
if (record == null)
{
throw new ArgumentNullException("record");
}
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
//
int len;
int offset = 0;
len = MakeVariableLengthHeader(buffer, offset, ElementTypeDescriptor.ElementSequence, out HeaderWriteState headerState);
offset += len;
foreach (ServiceAttribute attr in record)
{
WriteAttribute(attr, buffer, ref offset);
}//for
CompleteHeaderWrite(headerState, buffer, offset, out _);
System.Diagnostics.Debug.Assert(offset != 0);
return(offset);
}
/// <summary>
/// Reads the RFCOMM Channel Number value from the service record,
/// or returns -1 if the element is not present.
/// </summary>
/// -
/// <param name="record">The <see cref="ServiceRecord"/>
/// to search for the element.
/// </param>
/// -
/// <returns>The Channel Number as an unsigned byte cast to an Int32,
/// or -1 if at the <see cref="F:InTheHand.Net.Bluetooth.AttributeIds.UniversalAttributeId.ProtocolDescriptorList"/>
/// attribute is missing or contains invalid elements.
/// </returns>
public static int GetRfcommChannelNumber(ServiceRecord record)
{
ServiceElement channelElement = GetRfcommChannelElement(record);
if (channelElement == null)
{
return(-1);
}
return(GetRfcommChannelNumber(channelElement));
}
/// <summary>
/// Sets the RFCOMM Channel Number value in the service record.
/// </summary>
/// -
/// <param name="record">The <see cref="T:InTheHand.Net.Bluetooth.ServiceRecord"/>
/// in which to set the RFCOMM Channel number.
/// </param>
/// <param name="channelNumber">The Channel number to set in the record.
/// </param>
/// -
/// <exception cref="T:System.InvalidOperationException">The
/// <see cref="F:InTheHand.Net.Bluetooth.AttributeIds.UniversalAttributeId.ProtocolDescriptorList"/>
/// attribute is missing or contains invalid elements.
/// </exception>
public static void SetRfcommChannelNumber(ServiceRecord record, byte channelNumber)
{
ServiceElement channelElement = GetRfcommChannelElement(record);
if (channelElement == null)
{
throw new InvalidOperationException("ProtocolDescriptorList element does not exist or is not in the RFCOMM format.");
}
System.Diagnostics.Debug.Assert(channelElement.ElementType == ElementType.UInt8);
channelElement.SetValue(channelNumber);
}
/// <summary>
/// Creates a Service Record byte array from the given
/// <see cref="T:ServiceRecord"/> object.
/// </summary>
/// -
/// <remarks>
/// <para>The only oddity (as with parsing) is with the <c>TextString</c>
/// type. The <see cref="T:ServiceElement"/> can
/// either hold the string already encoded to its array of bytes or an
/// <see cref="T:System.String"/>. In the latter case we will always simply
/// encode the string to an array of bytes using encoding
/// <see cref="P:System.Text.Encoding.UTF8"/>.
/// </para>
/// <para>Currently any UUIDs in the record are written out in the form supplied,
/// we should probably write a ‘short-form’ equivalent if its
/// a ‘Bluetooth-based’ UUID e.g. <c>Uuid128</c> as <c>Uuid16</c>.
/// </para>
/// </remarks>
/// -
/// <param name="record">An instance of <see cref="T:ServiceRecord"/>
/// containing the record to be created.
/// </param>
/// -
/// <returns>An array of <see cref="T:System.Byte"/> containing the resultant
/// record bytes. The length of the array is the length of the record bytes.
/// </returns>
public byte[] CreateServiceRecord(ServiceRecord record)
{
const int MaxiOutputSize = 256;
byte[] tmpResult = new byte[MaxiOutputSize];
int length = CreateServiceRecord(record, tmpResult);
byte[] result = new byte[length];
Array.Copy(tmpResult, 0, result, 0, length);
return(result);
}
static ServiceElement GetChannelElement(ServiceRecord record, BluetoothProtocolDescriptorType proto)
{
if (!record.Contains(AttributeIds.ProtocolDescriptorList))
{
goto NotFound;
}
ServiceAttribute attr = record.GetAttributeById(AttributeIds.ProtocolDescriptorList);
return(GetChannelElement(attr, proto, out _));
NotFound:
return(null);
}
/// <summary>
/// Reads the RFCOMM Channel Number element from the service record.
/// </summary>
/// -
/// <param name="record">The <see cref="ServiceRecord"/>
/// to search for the element.
/// </param>
/// -
/// <returns>The <see cref="ServiceElement"/>
/// holding the Channel Number.
/// or <see langword="null"/> if at the <see cref="F:InTheHand.Net.Bluetooth.AttributeIds.UniversalAttributeId.ProtocolDescriptorList"/>
/// attribute is missing or contains invalid elements.
/// </returns>
public static ServiceElement GetRfcommChannelElement(ServiceRecord record)
{
return(GetChannelElement(record, BluetoothProtocolDescriptorType.Rfcomm));
}
public void Dispose()
{
m_record = null;
}
internal ServiceRecordEnumerator(ServiceRecord record)
{
m_record = record;
}