public static bool TryParse(byte[] buffer, int offset, out WebSocketFrameHeaderFlags headerFlags)
{
headerFlags = null;
if (buffer == null || buffer.Length - offset < 2)
{
return(false);
}
var optionByte = buffer[offset];
SetBit(ref optionByte, 7, false);
SetBit(ref optionByte, 6, false);
SetBit(ref optionByte, 5, false);
SetBit(ref optionByte, 4, false);
var options = (WebSocketFrameOption)optionByte;
options = options > (WebSocketFrameOption)128 ? options - 128 : options;
if (EnumHelper <WebSocketFrameOption> .IsDefined(options) == false)
{
return(false);
}
headerFlags = new WebSocketFrameHeaderFlags(buffer[offset], buffer[offset + 1], options);
if (options > WebSocketFrameOption.Binary)
{
headerFlags.FIN = true; // control frames is always final
}
return(true);
}
public static bool TryParse(byte[] buffer, int offset, out WebSocketFrameHeaderFlags headerFlags)
{
headerFlags = null;
if (buffer == null || buffer.Length - offset < 2)
{
return(false);
}
var optionByte = buffer[0];
SetBit(ref optionByte, 7, false);
SetBit(ref optionByte, 6, false);
SetBit(ref optionByte, 5, false);
SetBit(ref optionByte, 4, false);
int value = optionByte;
value = value > 128 ? value - 128 : value;
if (!Enum.IsDefined(typeof(WebSocketFrameOption), value))
{
return(false);
}
headerFlags = new WebSocketFrameHeaderFlags(buffer[0], buffer[1], (WebSocketFrameOption)value);
return(true);
}
public static WebSocketFrameHeader Create(Int64 count, Boolean isComplete, Boolean headerSent, WebSocketFrameOption option, WebSocketExtensionFlags extensionFlags)
{
var flags = new WebSocketFrameHeaderFlags(isComplete, headerSent ? WebSocketFrameOption.Continuation : option, extensionFlags);
Int32 headerLength;
if (count <= 125)
{
headerLength = 2;
}
else if (count < UInt16.MaxValue)
{
headerLength = 4;
}
else if ((UInt64)count < UInt64.MaxValue)
{
headerLength = 10;
}
else
{
throw new WebSocketException("Cannot create a header with a length of " + count);
}
return(new WebSocketFrameHeader()
{
HeaderLength = headerLength,
ContentLength = (Int64)count,
Flags = flags,
RemainingBytes = (Int64)count
});
}
public static WebSocketFrameHeader Create(long count, bool isComplete, bool headerSent, WebSocketFrameOption option, WebSocketExtensionFlags extensionFlags)
{
var flags = new WebSocketFrameHeaderFlags(isComplete, headerSent ? WebSocketFrameOption.Continuation : option, extensionFlags);
int headerLength;
if (count <= 125)
{
headerLength = 2;
}
else if (count <= ushort.MaxValue)
{
headerLength = 4;
}
else if ((ulong)count < ulong.MaxValue)
{
headerLength = 10;
}
else
{
throw new WebSocketException("Cannot create a header with a length of " + count);
}
return(new WebSocketFrameHeader()
{
HeaderLength = headerLength,
ContentLength = count,
Flags = flags,
RemainingBytes = count
});
}
private WebSocketExtensionFlags GetExtensionFlags(WebSocketFrameHeaderFlags webSocketFrameHeaderFlags)
{
var flags = new WebSocketExtensionFlags();
flags.Rsv1 = webSocketFrameHeaderFlags.RSV1;
flags.Rsv2 = webSocketFrameHeaderFlags.RSV2;
flags.Rsv3 = webSocketFrameHeaderFlags.RSV3;
return flags;
}
private WebSocketExtensionFlags GetExtensionFlags(WebSocketFrameHeaderFlags webSocketFrameHeaderFlags)
{
var flags = new WebSocketExtensionFlags();
flags.Rsv1 = webSocketFrameHeaderFlags.RSV1;
flags.Rsv2 = webSocketFrameHeaderFlags.RSV2;
flags.Rsv3 = webSocketFrameHeaderFlags.RSV3;
return(flags);
}
public static Boolean TryParse(Byte[] buffer, Int32 offset, out WebSocketFrameHeaderFlags headerFlags)
{
headerFlags = null;
if (buffer == null || buffer.Length - offset < 2)
return false;
var optionByte = buffer[0];
SetBit(ref optionByte, 7, false);
SetBit(ref optionByte, 6, false);
SetBit(ref optionByte, 5, false);
SetBit(ref optionByte, 4, false);
Int32 value = optionByte;
value = value > 128 ? value - 128 : value;
if (!Enum.IsDefined(typeof(WebSocketFrameOption), value))
return false;
headerFlags = new WebSocketFrameHeaderFlags(buffer[0],buffer[1],(WebSocketFrameOption)value);
return true;
}
public static WebSocketFrameHeader Create(long contentLength, bool isComplete, bool headerSent, uint maskKey, WebSocketFrameOption option, WebSocketExtensionFlags extensionFlags)
{
if (extensionFlags == null)
{
throw new ArgumentNullException(nameof(extensionFlags));
}
var isMasked = maskKey != 0;
var flags = new WebSocketFrameHeaderFlags(isComplete, isMasked, headerSent ? WebSocketFrameOption.Continuation : option, extensionFlags);
int headerLength;
if (contentLength <= 125)
{
headerLength = 2;
}
else if (contentLength <= ushort.MaxValue)
{
headerLength = 4;
}
else
{
headerLength = 10;
}
if (isMasked)
{
headerLength += 4;
}
return(new WebSocketFrameHeader
{
HeaderLength = headerLength,
ContentLength = contentLength,
Flags = flags,
RemainingBytes = contentLength,
MaskKey = maskKey
});
}
public static WebSocketFrameHeader Create(Int32 count, Boolean isComplete, Boolean headerSent, WebSocketFrameOption option, WebSocketExtensionFlags extensionFlags)
{
var flags = new WebSocketFrameHeaderFlags(isComplete, headerSent ? WebSocketFrameOption.Continuation : option, extensionFlags);
Int32 headerLength;
if (count <= 125)
headerLength = 2;
else if (count < UInt16.MaxValue)
headerLength = 4;
else if ((UInt64)count < UInt64.MaxValue)
headerLength = 10;
else
throw new WebSocketException("Cannot create a header with a length of " + count);
return new WebSocketFrameHeader()
{
HeaderLength = headerLength,
ContentLength = (UInt64)count,
Flags = flags,
RemainingBytes = (UInt64)count
};
}
public static bool TryParse(byte[] frameStart, int offset, int headerLength, out WebSocketFrameHeader header)
{
if (frameStart == null)
{
throw new ArgumentNullException(nameof(frameStart));
}
header = null;
var availableLength = frameStart.Length - offset;
if (availableLength < 6 || availableLength < headerLength)
{
return(false);
}
var value = frameStart[offset + 1];
var contentLength = (long)(value >= 128 ? value - 128 : value);
if (contentLength <= 125)
{
// small frame
}
else if (contentLength == 126)
{
if (availableLength < headerLength)
{
return(false);
}
contentLength = EndianBitConverter.ToUInt16Be(frameStart, offset + 2);
}
else if (contentLength == 127)
{
if (availableLength < headerLength)
{
return(false);
}
var length = EndianBitConverter.ToUInt64Be(frameStart, offset + 2);
if (length > long.MaxValue)
{
throw new WebSocketException("The maximum supported frame length is 9223372036854775807, current frame is " + length.ToString());
}
contentLength = (long)length;
}
else
{
return(false);
}
WebSocketFrameHeaderFlags flags;
if (!WebSocketFrameHeaderFlags.TryParse(frameStart, offset, out flags))
{
return(false);
}
var maskKey = 0U;
if (flags.MASK)
{
headerLength -= 4;
maskKey = EndianBitConverter.ToUInt32Le(frameStart, offset + headerLength);
}
header = new WebSocketFrameHeader
{
ContentLength = contentLength,
HeaderLength = headerLength,
Flags = flags,
RemainingBytes = contentLength,
MaskKey = maskKey
};
return(true);
}
public static Boolean TryParse(Byte[] frameStart, Int32 offset, Int32 headerLength, ArraySegment <Byte> keySegment, out WebSocketFrameHeader header)
{
header = null;
if (frameStart == null || frameStart.Length < 6 || frameStart.Length < (offset + headerLength))
{
return(false);
}
Int32 value = frameStart[offset + 1];
Int64 contentLength = (Int64)(value >= 128?value - 128:value);
if (contentLength <= 125)
{
// small frame
}
else if (contentLength == 126)
{
if (frameStart.Length < headerLength)
{
return(false);
}
if (BitConverter.IsLittleEndian)
{
frameStart.ReversePortion(offset + 2, 2);
}
contentLength = BitConverter.ToUInt16(frameStart, 2);
}
else if (contentLength == 127)
{
if (frameStart.Length < headerLength)
{
return(false);
}
if (BitConverter.IsLittleEndian)
{
frameStart.ReversePortion(offset + 2, 8);
}
UInt64 length = BitConverter.ToUInt64(frameStart, 2);
if (length > Int64.MaxValue)
{
throw new WebSocketException("The maximum supported frame length is 9223372036854775807, current frame is " + length.ToString());
}
contentLength = (Int64)length;
}
else
{
return(false);
}
WebSocketFrameHeaderFlags flags;
if (WebSocketFrameHeaderFlags.TryParse(frameStart, offset, out flags))
{
header = new WebSocketFrameHeader(keySegment)
{
ContentLength = contentLength,
HeaderLength = headerLength,
Flags = flags,
RemainingBytes = contentLength
};
if (flags.MASK)
{
headerLength -= 4;
for (int i = 0; i < 4; i++)
{
header._key.Array[header._key.Offset + i] = frameStart[offset + i + headerLength];
}
}
return(true);
}
return(false);
}
public static Boolean TryParse(Byte[] frameStart, Int32 offset, Int32 headerLength, ArraySegment <Byte> keySegment, out WebSocketFrameHeader header)
{
header = null;
if (frameStart == null || frameStart.Length < 6 || frameStart.Length < (offset + headerLength))
{
return(false);
}
Int32 value = frameStart[offset + 1];
UInt64 contentLength = (UInt64)(value >= 128?value - 128:value);
if (contentLength <= 125)
{
// small frame
}
else if (contentLength == 126)
{
if (frameStart.Length < headerLength)
{
return(false);
}
if (BitConverter.IsLittleEndian)
{
frameStart.ReversePortion(offset + 2, 2);
}
contentLength = BitConverter.ToUInt16(frameStart, 2);
}
else if (contentLength == 127)
{
if (frameStart.Length < headerLength)
{
return(false);
}
if (BitConverter.IsLittleEndian)
{
frameStart.ReversePortion(offset + 2, 8);
}
contentLength = (UInt64)BitConverter.ToUInt64(frameStart, 2);
}
else
{
return(false);
}
WebSocketFrameHeaderFlags flags;
if (WebSocketFrameHeaderFlags.TryParse(frameStart, offset, out flags))
{
header = new WebSocketFrameHeader(keySegment)
{
ContentLength = contentLength,
HeaderLength = headerLength,
Flags = flags,
RemainingBytes = contentLength
};
if (flags.MASK)
{
headerLength -= 4;
for (int i = 0; i < 4; i++)
{
header._key.Array[header._key.Offset + i] = frameStart[offset + i + headerLength];
}
}
return(true);
}
return(false);
}
