/// <summary>
/// Decodes the specified region of the buffer into an unadjusted frame length. The default implementation is
/// capable of decoding the specified region into an unsigned 8/16/24/32/64 bit integer. Override this method to
/// decode the length field encoded differently.
/// Note that this method must not modify the state of the specified buffer (e.g.
/// <see cref="IByteBuffer.ReaderIndex" />,
/// <see cref="IByteBuffer.WriterIndex" />, and the content of the buffer.)
/// </summary>
/// <param name="buffer">The buffer we'll be extracting the frame length from.</param>
/// <param name="offset">The offset from the absolute <see cref="IByteBuffer.ReaderIndex" />.</param>
/// <param name="length">The length of the framelenght field. Expected: 1, 2, 3, 4, or 8.</param>
/// <param name="order">The preferred <see cref="ByteOrder" /> of <see cref="buffer" />.</param>
/// <returns>A long integer that represents the unadjusted length of the next frame.</returns>
protected long GetUnadjustedFrameLength(IByteBuffer buffer, int offset, int length, ByteOrder order)
{
buffer = buffer.WithOrder(order);
long frameLength;
switch (length)
{
case 1:
frameLength = buffer.GetByte(offset);
break;
case 2:
frameLength = buffer.GetShort(offset);
break;
case 4:
frameLength = buffer.GetInt(offset);
break;
case 8:
frameLength = buffer.GetLong(offset);
break;
default:
throw new DecoderException("unsupported lengthFieldLength: " + this.lengthFieldLength + " (expected: 1, 2, 3, 4, or 8)");
}
return(frameLength);
}
protected override long GetUnadjustedFrameLength(IByteBuffer buffer, int offset, int length, ByteOrder order)
{
buffer = buffer.WithOrder(order);
var scalarPrefix = buffer.GetByte(offset++);
if (buffer.ReadableBytes - (offset - buffer.ReaderIndex) < scalarPrefix)
{
return(scalarPrefix);
}
switch (scalarPrefix)
{
case 1:
return(buffer.GetByte(offset) + scalarPrefix);
case 2:
return(buffer.GetShort(offset) + scalarPrefix);
case 4:
return(buffer.GetInt(offset) + scalarPrefix);
default:
throw new ProudException("Invalid scalar prefix " + scalarPrefix);
}
}
public static ushort GetUnsignedShort(this IByteBuffer buf, int index)
{
unchecked
{
return((ushort)buf.GetShort(index));
}
}
public void handleReceive(IByteBuffer byteBuf, Ukcp ukcp)
{
short curCount = byteBuf.GetShort(byteBuf.ReaderIndex);
Console.WriteLine(Thread.CurrentThread.Name + " 收到消息 " + curCount);
ukcp.write(byteBuf);
if (curCount == -1)
{
ukcp.close();
}
}
///<summary>
/// Returns the closing status code as per http://tools.ietf.org/html/rfc6455#section-7.4 RFC 6455.
/// If a status code is set, -1 is returned.
/// </summary>
public int StatusCode()
{
IByteBuffer binaryData = this.Content;
if (binaryData is null || 0u >= (uint)binaryData.Capacity)
{
return(-1);
}
_ = binaryData.SetReaderIndex(0);
return(binaryData.GetShort(0));
}
protected override long GetUnadjustedFrameLength(IByteBuffer buffer, int offset, int length, ByteOrder order)
{
buffer = buffer.WithOrder(ByteOrder.LittleEndian);
var scalarPrefix = buffer.GetByte(offset++);
switch (scalarPrefix)
{
case 1:
return(buffer.ReadableBytes < 1 ? 1 : buffer.GetByte(offset) + 1);
case 2:
return(buffer.ReadableBytes < 2 ? 2 : buffer.GetShort(offset) + 2);
case 4:
return(buffer.ReadableBytes < 4 ? 4 : buffer.GetInt(offset) + 4);
default:
throw new ProudException("Invalid scalar prefix " + scalarPrefix);
}
}
protected override long GetUnadjustedFrameLength(IByteBuffer buffer, int offset, int length, ByteOrder order)
{
buffer = buffer.WithOrder(ByteOrder.LittleEndian);
var scalarPrefix = buffer.GetByte(offset++);
// lengthFieldOffset from constructor + scalarPrefix from above
var bytesLeft = buffer.ReadableBytes - Math.Abs(buffer.ReaderIndex - offset) + 1;
switch (scalarPrefix)
{
case 1:
return(bytesLeft < 1 ? 1 : buffer.GetByte(offset) + 1);
case 2:
return(bytesLeft < 2 ? 2 : buffer.GetShort(offset) + 2);
case 4:
return(bytesLeft < 4 ? 4 : buffer.GetInt(offset) + 4);
default:
throw new ProudException("Invalid scalar prefix " + scalarPrefix);
}
}
public virtual short GetShort(int index) => Buf.GetShort(index);
/// <summary>
/// Decodes the specified region of the buffer into an unadjusted frame length. The default implementation is
/// capable of decoding the specified region into an unsigned 8/16/24/32/64 bit integer. Override this method to
/// decode the length field encoded differently.
/// Note that this method must not modify the state of the specified buffer (e.g.
/// <see cref="IByteBuffer.ReaderIndex" />,
/// <see cref="IByteBuffer.WriterIndex" />, and the content of the buffer.)
/// </summary>
/// <param name="buffer">The buffer we'll be extracting the frame length from.</param>
/// <param name="offset">The offset from the absolute <see cref="IByteBuffer.ReaderIndex" />.</param>
/// <param name="length">The length of the framelenght field. Expected: 1, 2, 3, 4, or 8.</param>
/// <param name="order">The preferred <see cref="ByteOrder" /> of <see cref="buffer" />.</param>
/// <returns>A long integer that represents the unadjusted length of the next frame.</returns>
protected long GetUnadjustedFrameLength(IByteBuffer buffer, int offset, int length, ByteOrder order)
{
buffer = buffer.WithOrder(order);
long frameLength;
switch (length)
{
case 1:
frameLength = buffer.GetByte(offset);
break;
case 2:
frameLength = buffer.GetShort(offset);
break;
case 4:
frameLength = buffer.GetInt(offset);
break;
case 8:
frameLength = buffer.GetLong(offset);
break;
default:
throw new DecoderException("unsupported lengthFieldLength: " + this.lengthFieldLength + " (expected: 1, 2, 3, 4, or 8)");
}
return frameLength;
}
/// <summary>
/// Return how much bytes can be read out of the encrypted data. Be aware that this method will not increase
/// the readerIndex of the given <see cref="IByteBuffer"/>.
/// </summary>
/// <param name="buffer">
/// The <see cref="IByteBuffer"/> to read from. Be aware that it must have at least
/// <see cref="SSL_RECORD_HEADER_LENGTH"/> bytes to read,
/// otherwise it will throw an <see cref="ArgumentException"/>.
/// </param>
/// <param name="offset">Offset to record start.</param>
/// <returns>
/// The length of the encrypted packet that is included in the buffer. This will
/// return <c>-1</c> if the given <see cref="IByteBuffer"/> is not encrypted at all.
/// </returns>
public static int GetEncryptedPacketLength(IByteBuffer buffer, int offset)
{
int packetLength = 0;
// SSLv3 or TLS - Check ContentType
bool tls;
switch (buffer.GetByte(offset))
{
case SSL_CONTENT_TYPE_CHANGE_CIPHER_SPEC:
case SSL_CONTENT_TYPE_ALERT:
case SSL_CONTENT_TYPE_HANDSHAKE:
case SSL_CONTENT_TYPE_APPLICATION_DATA:
case SSL_CONTENT_TYPE_EXTENSION_HEARTBEAT:
tls = true;
break;
default:
// SSLv2 or bad data
tls = false;
break;
}
if (tls)
{
// SSLv3 or TLS - Check ProtocolVersion
int majorVersion = buffer.GetByte(offset + 1);
if (majorVersion == 3)
{
// SSLv3 or TLS
packetLength = buffer.GetUnsignedShort(offset + 3) + SSL_RECORD_HEADER_LENGTH;
if ((uint)packetLength <= SSL_RECORD_HEADER_LENGTH)
{
// Neither SSLv3 or TLSv1 (i.e. SSLv2 or bad data)
tls = false;
}
}
else
{
// Neither SSLv3 or TLSv1 (i.e. SSLv2 or bad data)
tls = false;
}
}
if (!tls)
{
// SSLv2 or bad data - Check the version
uint uHeaderLength = (buffer.GetByte(offset) & 0x80) != 0 ? 2u : 3u;
uint uMajorVersion = buffer.GetByte(offset + (int)uHeaderLength + 1);
if (uMajorVersion == 2u || uMajorVersion == 3u)
{
// SSLv2
packetLength = uHeaderLength == 2u ?
(buffer.GetShort(offset) & 0x7FFF) + 2 : (buffer.GetShort(offset) & 0x3FFF) + 3;
if (uHeaderLength >= (uint)packetLength)
{
return(NOT_ENOUGH_DATA);
}
}
else
{
return(NOT_ENCRYPTED);
}
}
return(packetLength);
}
public short GetShort(int index)
{
CheckIndex(index, 2);
return(_buffer.GetShort(index));
}
public static char GetChar(this IByteBuffer buf, int index) => Convert.ToChar(buf.GetShort(index));
