//--------------------
//
/// <summary>
/// Gets the list of <see cref="T:InTheHand.Net.Bluetooth.LanguageBaseItem"/>
/// items in the service record.
/// </summary>
/// -
/// <param name="elementSequence">
/// A <see cref="T:InTheHand.Net.Bluetooth.ServiceElement"/> holding the
/// data from the
/// <see cref="F:InTheHand.Net.Bluetooth.AttributeIds.UniversalAttributeId.LanguageBaseAttributeIdList"/>
/// attribute.
/// </param>
/// -
/// <returns>
/// An array of <see cref="T:InTheHand.Net.Bluetooth.LanguageBaseItem"/>.
/// An array length zero is returned if the service record contains no such attribute.
/// </returns>
/// -
/// <exception cref="T:System.ArgumentException">
/// <paramref name="elementSequence"/> is not of type
/// <see cref="F:InTheHand.Net.Bluetooth.ElementType.ElementSequence"/>.
/// </exception>
/// <exception cref="T:System.Net.ProtocolViolationException">
/// The element sequence contains incorrectly formatted or invalid content,
/// for example it contains the wrong element data types, or doesn't contain
/// the elements in groups of three as required.
/// </exception>
public static LanguageBaseItem[] ParseListFromElementSequence(ServiceElement elementSequence)
{
if (elementSequence.ElementType != ElementType.ElementSequence)
{
throw new ArgumentException(ErrorMsgLangBaseListParseNotSequence);
}
#if V1
IList elementList = elementSequence.GetValueAsElementList();
#else
IList <ServiceElement> elementList = elementSequence.GetValueAsElementList();
#endif
int numElements = elementList.Count;
const int ElementsPerItem = 3;
if (numElements == 0 || (numElements % ElementsPerItem) != 0)
{
throw new System.Net.ProtocolViolationException(ErrorMsgLangBaseListParseNotInThrees);
}
int numItems = numElements / ElementsPerItem;
LanguageBaseItem[] items = new LanguageBaseItem[numItems];
for (int i = 0; i < numItems; ++i)
{
// Casts are for the non-Generic version.
ServiceElement e1Lang = elementList[i * ElementsPerItem];
ServiceElement e2EncId = elementList[i * ElementsPerItem + 1];
ServiceElement e3BaseId = elementList[i * ElementsPerItem + 2];
if (e1Lang.ElementType != ElementType.UInt16 || e2EncId.ElementType != ElementType.UInt16 || e3BaseId.ElementType != ElementType.UInt16)
{
throw new System.Net.ProtocolViolationException(ErrorMsgLangBaseListParseNotU16);
}
if ((ushort)e3BaseId.Value == 0)
{
throw new System.Net.ProtocolViolationException(ErrorMsgLangBaseListParseBaseInvalid);
}
LanguageBaseItem item = new LanguageBaseItem(
(ushort)e1Lang.Value, (ushort)e2EncId.Value, (ushort)e3BaseId.Value);
items[i] = item;
}
return(items);
}
/// <summary>
/// Create the element in the buffer starting at offset, and return its totalLength.
/// </summary>
/// <param name="element">The element to create.
/// </param>
/// <param name="buf">The byte array to write the encoded element to.
/// </param>
/// <param name="offset">The place to start writing in <paramref name="buf"/>.
/// </param>
///
/// <returns>The total length of the encoded element written to the buffer
/// </returns>
protected virtual int CreateElement(ServiceElement element, byte[] buf, int offset)
{
int totalLength;
//
if (element.ElementTypeDescriptor == ElementTypeDescriptor.ElementSequence ||
element.ElementTypeDescriptor == ElementTypeDescriptor.ElementAlternative)
{
int curLen;
curLen = MakeVariableLengthHeader(buf, offset, element.ElementTypeDescriptor, out HeaderWriteState headerState);
offset += curLen;
foreach (ServiceElement childElement in element.GetValueAsElementList())
{
curLen = CreateElement(childElement, buf, offset);
offset += curLen;
}//for
CompleteHeaderWrite(headerState, buf, offset, out totalLength);
//----------------
}
else if (element.ElementTypeDescriptor == ElementTypeDescriptor.UnsignedInteger ||
element.ElementTypeDescriptor == ElementTypeDescriptor.TwosComplementInteger)
{
switch (element.ElementType)
{
case ElementType.UInt8:
WriteByte(element, (byte)element.Value, buf, ref offset, out totalLength);
break;
case ElementType.Int8:
WriteSByte(element, (sbyte)element.Value, buf, ref offset, out totalLength);
break;
case ElementType.UInt16:
WriteUInt16(element, (ushort)element.Value, buf, ref offset, out totalLength);
break;
case ElementType.Int16:
WriteInt16(element, (short)element.Value, buf, ref offset, out totalLength);
break;
case ElementType.UInt32:
WriteUInt32(element, (uint)element.Value, buf, ref offset, out totalLength);
break;
case ElementType.Int32:
WriteInt32(element, (int)element.Value, buf, ref offset, out totalLength);
break;
case ElementType.UInt64:
WriteUInt64(element, (ulong)element.Value, buf, ref offset, out totalLength);
break;
case ElementType.Int64:
WriteInt64(element, (long)element.Value, buf, ref offset, out totalLength);
break;
default:
System.Diagnostics.Debug.Fail(string.Format(System.Globalization.CultureInfo.InvariantCulture,
"Unexpected integral type '{0}'.", element.ElementType));
totalLength = 0;
break;
}//switch
//----------------
}
else if (element.ElementTypeDescriptor == ElementTypeDescriptor.Uuid)
{
if (element.ElementType == ElementType.Uuid16)
{
WriteUInt16(element, (ushort)element.Value, buf, ref offset, out totalLength);
}
else if (element.ElementType == ElementType.Uuid32)
{
WriteUInt32(element, (uint)element.Value, buf, ref offset, out totalLength);
}
else
{
//TODO If the 'Guid' holds a 'Bluetooth-based' UUID, then should we write the short form?
byte[] bytes;
System.Diagnostics.Debug.Assert(element.ElementType == ElementType.Uuid128);
Guid hostGuid = (Guid)element.Value;
Guid netGuid = Sockets.BluetoothListener.HostToNetworkOrder(hostGuid);
bytes = netGuid.ToByteArray();
WriteFixedLength(element, bytes, buf, ref offset, out totalLength);
}
//----------------
}
else if (element.ElementTypeDescriptor == ElementTypeDescriptor.Url)
{
Uri uri = element.GetValueAsUri();
string uriString = uri.ToString();
byte[] valueBytes = System.Text.Encoding.ASCII.GetBytes(uriString);
WriteVariableLength(element, valueBytes, buf, ref offset, out totalLength);
//----------------
}
else if (element.ElementTypeDescriptor == ElementTypeDescriptor.TextString)
{
byte[] valueBytes;
if (element.Value is string valueString)
{
valueBytes = System.Text.Encoding.UTF8.GetBytes(valueString);
}
else
{
System.Diagnostics.Debug.Assert(element.Value is byte[]);
valueBytes = (byte[])element.Value;
}
WriteVariableLength(element, valueBytes, buf, ref offset, out totalLength);
//----------------
}
else if (element.ElementTypeDescriptor == ElementTypeDescriptor.Nil)
{
WriteFixedLength(element, new byte[0], buf, ref offset, out totalLength);
//----------------
}
else if (element.ElementTypeDescriptor == ElementTypeDescriptor.Boolean)
{
bool value = (bool)element.Value;
byte[] valueBytes = new byte[1];
valueBytes[0] = value ? (byte)1 : (byte)0;
WriteFixedLength(element, valueBytes, buf, ref offset, out totalLength);
//----------------
}
else
{
totalLength = 0;
}
//
if (totalLength == 0)
{
throw new NotSupportedException(string.Format(System.Globalization.CultureInfo.InvariantCulture,
"Creation of element type '{0}' not implemented.", element.ElementType));
}
return(totalLength);
}
