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 IValidation <WSFrame> Add(WSFrame fragment)
{
ValidateContinuationState(OpCode, fragment.OpCode);
OpCode |= fragment.OpCode;
_validate.Add(fragment.Payload);
return(this);
}
public static WSFrame Valid(WSFrame f)
{
if (!Ops.AllPossible.Contains(f.OpCode))
{
throw OutOfBounds(f.OpCode);
}
if (Ops.ControlFrames.Contains(f.OpCode) && f.Payload.Length > 125)
{
throw BadLength;
}
return(f);
}
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);
}
static bool IsNotClose(WSFrame f) => !IsClose(f);
static bool IsClose(WSFrame f) => f.OpCode == Ops.Close;
static bool IsControlcode(WSFrame f) => ((byte)f.OpCode & (byte)0b0000_1000) != 0;