// Header format is: yyyyuua{yv}
public byte[] GetHeaderData()
{
WvDbusWriter w = new WvDbusWriter();
w.Write((byte)endian);
w.Write((byte)type);
w.Write((byte)flags);
w.Write((byte)Dbus.Protocol.Version);
w.Write(Body != null ? (uint)Body.Length : 0);
w.Write((uint)serial);
// This two-step process is a little convoluted because of the
// way the WriteArray function needs to work. That, in turn,
// is convoluted because the alignment of an array is complicated:
// there's different padding for zero-element arrays than for
// nonzero-element arrays, and WriteArray does that for us,
// which means it needs to know in advance how many elements
// are in our array.
var l = new List<Dbus.Field>();
if (sender.ne())
l.Add(Dbus.Field.Sender);
if (dest.ne())
l.Add(Dbus.Field.Destination);
if (rserial.HasValue)
l.Add(Dbus.Field.ReplySerial);
if (signature.ne())
l.Add(Dbus.Field.Signature);
if (path.ne())
l.Add(Dbus.Field.Path);
if (ifc.ne())
l.Add(Dbus.Field.Interface);
if (method.ne())
l.Add(Dbus.Field.Member);
if (err.ne())
l.Add(Dbus.Field.ErrorName);
w.WriteArray(8, l, (w2, i) => {
switch (i)
{
case Dbus.Field.Sender:
wws(w2, i, "s", sender);
break;
case Dbus.Field.Destination:
wws(w2, i, "s", dest);
break;
case Dbus.Field.ReplySerial:
wv.assert(rserial.Value != 0);
wwu(w2, i, "u", rserial.Value);
break;
case Dbus.Field.Signature:
wwsig(w2, i, "g", signature);
break;
case Dbus.Field.Path:
wws(w2, i, "o", path);
break;
case Dbus.Field.Interface:
wws(w2, i, "s", ifc);
break;
case Dbus.Field.Member:
wws(w2, i, "s", method);
break;
case Dbus.Field.ErrorName:
wws(w2, i, "s", err);
break;
default:
break; // unknown field code, ignore
}
});
w.WritePad(8); // the header is *always* a multiple of 8
return w.ToArray();
}
