public static IEnumerable <byte> Frame(WSFrame f)
{
yield return((byte)f.OpCode);
var l = f.Payload.Length;
if (l < 126)
{
yield return((byte)l);
}
else if (l <= ushort.MaxValue)
{
yield return(0x7E);
foreach (var b in Bits.To2Bytes((ushort)l))
{
yield return(b);
}
}
else
{
yield return(0x7F);
foreach (var b in Bits.To8Bytes((ulong)l))
{
yield return(b);
}
}
foreach (var b in f.Payload)
{
yield return(b);
}
}
public static int ExtendedLength(byte[] xln, int snd)
{
if (snd == 126)
{
return(Bits.From2Bytes(xln));
}
if (snd == 127)
{
return((int)Bits.From8Bytes(xln));
}
else
{
return(snd);
}
}
public static WSFrame ClosePayload(WSFrame f)
{
if (f.Payload.Length == 0)
{
return(f);
}
if (f.Payload.Length == 1)
{
throw BadCloseLength;
}
var c = Bytes.From2Bytes(f.Payload.Take(2));
if (!Ops.ValidCloseCodes.Contains(c))
{
throw BadCloseCode(c);
}
var valid = new Utf8Validation();
var _ = valid.Add(f.Payload.Skip(2).ToArray()).Result;
return(f);
}