public static string GetText(this IWebSocketPayload payload)
{
if (payload == null || !payload.IsText)
{
return(null);
}
return(payload.Data == null
? string.Empty
: Encoding.UTF8.GetString(payload.Data, payload.Offset, payload.Length));
}
public async Task ReadFromAsync(IDataLayer layer, CancellationToken cancellationToken)
{
var headerBytes = await layer.ReadAsync(2, cancellationToken);
this.IsFin = (headerBytes[0] & 0x80) == 0x80;
this.IsRsv1 = (headerBytes[0] & 0x40) == 0x40;
this.IsRsv2 = (headerBytes[0] & 0x20) == 0x20;
this.IsRsv3 = (headerBytes[0] & 0x10) == 0x10;
this.Opcode = (WebSocketOpcode)(headerBytes[0] & 0x0f);
if (this.IsControlFrame && !this.IsFin)
{
throw new WebSocketException(WebSocketErrorCode.CloseInvalidData, ErrorMessages.FragmentedControlFrame);
}
if (!this.IsDataFrame && this.IsRsv1)
{
throw new WebSocketException(WebSocketErrorCode.CloseInvalidData, ErrorMessages.CompressedNonDataFrame);
}
this.IsMasked = (headerBytes[1] & 0x80) == 0x80;
if (this.IsMasked)
{
this.MaskingKey = await layer.ReadAsync(4, cancellationToken);
}
else
{
this.MaskingKey = null;
}
ulong payloadLength = (byte)(headerBytes[1] & 0x7f);
if (this.IsControlFrame && payloadLength > 125)
{
throw new WebSocketException(WebSocketErrorCode.CloseInconstistentData, ErrorMessages.PayloadLengthControlFrame);
}
var extendedPayloadLengthSize = payloadLength < 126 ? 0 : payloadLength < 127 ? 2 : 8;
if (extendedPayloadLengthSize > 0)
{
var extendedPayloadLength = await layer.ReadAsync(extendedPayloadLengthSize, cancellationToken);
payloadLength = extendedPayloadLengthSize == 2
? extendedPayloadLength.ToUInt16(ByteOrder.BigEndian)
: extendedPayloadLength.ToUInt64(ByteOrder.BigEndian);
if (payloadLength > int.MaxValue)
{
throw new WebSocketException(WebSocketErrorCode.CloseMessageTooBig);
}
}
if (payloadLength > 0)
{
this.Payload = new WebSocketPayload(this, await layer.ReadAsync((int)payloadLength, cancellationToken));
if (this.IsMasked)
{
this.MaskPayload(
this.Payload.Data, this.Payload.Offset, this.Payload.Length,
this.Payload.Data, this.Payload.Offset);
}
}
else
{
this.Payload = null;
}
}
public async Task ReadFromAsync(IDataLayer layer, CancellationToken cancellationToken)
{
var headerBytes = await layer.ReadAsync(2, cancellationToken);
this.IsFin = (headerBytes[0] & 0x80) == 0x80;
this.IsRsv1 = (headerBytes[0] & 0x40) == 0x40;
this.IsRsv2 = (headerBytes[0] & 0x20) == 0x20;
this.IsRsv3 = (headerBytes[0] & 0x10) == 0x10;
this.Opcode = (WebSocketOpcode)(headerBytes[0] & 0x0f);
if (this.IsControlFrame && !this.IsFin)
throw new WebSocketException(WebSocketErrorCode.CloseInvalidData, ErrorMessages.FragmentedControlFrame);
if (!this.IsDataFrame && this.IsRsv1)
throw new WebSocketException(WebSocketErrorCode.CloseInvalidData, ErrorMessages.CompressedNonDataFrame);
this.IsMasked = (headerBytes[1] & 0x80) == 0x80;
if (this.IsMasked)
this.MaskingKey = await layer.ReadAsync(4, cancellationToken);
else
this.MaskingKey = null;
ulong payloadLength = (byte)(headerBytes[1] & 0x7f);
if (this.IsControlFrame && payloadLength > 125)
throw new WebSocketException(WebSocketErrorCode.CloseInconstistentData, ErrorMessages.PayloadLengthControlFrame);
var extendedPayloadLengthSize = payloadLength < 126 ? 0 : payloadLength < 127 ? 2 : 8;
if (extendedPayloadLengthSize > 0)
{
var extendedPayloadLength = await layer.ReadAsync(extendedPayloadLengthSize, cancellationToken);
payloadLength = extendedPayloadLengthSize == 2
? extendedPayloadLength.ToUInt16(ByteOrder.BigEndian)
: extendedPayloadLength.ToUInt64(ByteOrder.BigEndian);
if (payloadLength > int.MaxValue)
throw new WebSocketException(WebSocketErrorCode.CloseMessageTooBig);
}
if (payloadLength > 0)
{
this.Payload = new WebSocketPayload(this, await layer.ReadAsync((int)payloadLength, cancellationToken));
if (this.IsMasked)
{
this.MaskPayload(
this.Payload.Data, this.Payload.Offset, this.Payload.Length,
this.Payload.Data, this.Payload.Offset);
}
}
else
{
this.Payload = null;
}
}
