public WvDbusMsg(WvBytes b)
{
int hlen, blen;
_bytes_needed(b, out hlen, out blen);
wv.assert(b.len == hlen+blen);
SetHeaderData(b);
Body = b.sub(hlen, blen).ToArray();
}
// Tries to guess how many bytes you'll need into inbuf before you can
// read an entire message. The buffer needs to have at least 16
// bytes before you can start.
static void _bytes_needed(WvBytes b, out int hlen, out int blen)
{
wv.assert(b.len >= 16);
// the real header signature is: yyyyuua{yv}
// However, we only care about the first 16 bytes, and we know
// that the a{yv} starts with an unsigned int that's the number
// of bytes in the array, which is what we *really* want to know.
// So we lie about the signature here.
var it = new WvDbusIter((Dbus.Endian)b[0], "yyyyuuu", b.sub(0,16))
.GetEnumerator();
it.pop();
it.pop();
it.pop();
byte version = it.pop();
if (version < Dbus.Protocol.MinVersion || version > Dbus.Protocol.MaxVersion)
throw new NotSupportedException
("Dbus.Protocol version '"
+ version.ToString() + "' is not supported");
uint _blen = it.pop(); // body length
it.pop(); // serial
uint _hlen = it.pop(); // remaining header length
if (_blen > Int32.MaxValue || _hlen > Int32.MaxValue)
throw new NotImplementedException
("Long messages are not yet supported");
hlen = 16 + Dbus.Protocol.Padded((int)_hlen, 8);
blen = (int)_blen;
}
