public void ResetRead()
{
_state = HandshakeFrameState.VersionMajor;
_receiveStateBytesLeft = 1; //identity length
_receiveBufferOffset = 0;
_receiveStateLength = -1;
RequiredExtensions = new HandshakeExtension[0];
OptionalExtensions = new HandshakeExtension[0];
Identity = "";
}
public void ResetRead()
{
_state = HandshakeFrameState.VersionMajor;
_receiveStateBytesLeft = 1; //identity length
_receiveBufferOffset = 0;
_receiveStateLength = -1;
RequiredExtensions = new HandshakeExtension[0];
OptionalExtensions = new HandshakeExtension[0];
Identity = "";
}
/// <summary>
/// Process bytes that we've received from the other end point. Might be a partial or complete frame.
/// </summary>
/// <param name="buffer">Buffer to process</param>
/// <param name="offset">Where in buffer to start processing bytes</param>
/// <param name="bytesToProcess">Bytes available to process</param>
/// <returns>
/// Offset where the next serializer should start process (unless the offset is the same as amount of bytes
/// transferred)
/// </returns>
public bool Read(byte[] buffer, ref int offset, ref int bytesToProcess)
{
var numberOfBytesTransferredFromStart = bytesToProcess;
var frameCompleted = false;
while (bytesToProcess > 0 && !frameCompleted)
{
bool isBufferCopyCompleted;
switch (_state)
{
case HandshakeFrameState.VersionMajor:
VersionMajor = buffer[offset];
_state = HandshakeFrameState.VersionMinor;
++offset;
--bytesToProcess;
break;
case HandshakeFrameState.VersionMinor:
VersionMinor = buffer[offset];
_state = HandshakeFrameState.Flags;
++offset;
--bytesToProcess;
break;
case HandshakeFrameState.Flags:
Flags = buffer[offset];
_state = HandshakeFrameState.IdentityLength;
_receiveStateBytesLeft = 1;
++offset;
--bytesToProcess;
break;
case HandshakeFrameState.IdentityLength:
_receiveStateLength = _receiveStateBytesLeft = buffer[offset];
_state = HandshakeFrameState.Identity;
++offset;
--bytesToProcess;
break;
case HandshakeFrameState.Identity:
isBufferCopyCompleted = CopyToBuffer(buffer, ref offset, ref bytesToProcess);
if (isBufferCopyCompleted)
{
Identity = Encoding.ASCII.GetString(_receiveBuffer, 0, _receiveStateLength);
_receiveStateBytesLeft = 2;
_state = HandshakeFrameState.RequiredLength;
}
break;
case HandshakeFrameState.RequiredLength:
isBufferCopyCompleted = CopyToBuffer(buffer, ref offset, ref bytesToProcess);
if (isBufferCopyCompleted)
{
if (BitConverter.IsLittleEndian)
Array.Reverse(_receiveBuffer, 0, 2);
_receiveStateLength = _receiveStateBytesLeft = BitConverter.ToInt16(_receiveBuffer, 0);
if (_receiveStateLength == 0)
{
_state = HandshakeFrameState.OptionalLength;
_receiveStateBytesLeft = 2;
}
else
{
_state = HandshakeFrameState.Required;
}
}
break;
case HandshakeFrameState.Required:
isBufferCopyCompleted = CopyToBuffer(buffer, ref offset, ref bytesToProcess);
if (isBufferCopyCompleted)
{
var values = Encoding.ASCII.GetString(_receiveBuffer, 0, _receiveStateLength).Split(';');
RequiredExtensions = values.Select(HandshakeExtension.Parse).ToArray();
_receiveStateBytesLeft = 2;
_state = HandshakeFrameState.OptionalLength;
}
break;
case HandshakeFrameState.OptionalLength:
isBufferCopyCompleted = CopyToBuffer(buffer, ref offset, ref bytesToProcess);
if (isBufferCopyCompleted)
{
if (BitConverter.IsLittleEndian)
Array.Reverse(_receiveBuffer, 0, 2);
_receiveStateLength = _receiveStateBytesLeft = BitConverter.ToInt16(_receiveBuffer, 0);
if (_receiveStateLength == 0)
frameCompleted = true;
else
_state = HandshakeFrameState.Optional;
}
break;
case HandshakeFrameState.Optional:
isBufferCopyCompleted = CopyToBuffer(buffer, ref offset, ref bytesToProcess);
if (isBufferCopyCompleted)
{
var values = Encoding.ASCII.GetString(_receiveBuffer, 0, _receiveStateLength).Split(';');
OptionalExtensions = values.Select(HandshakeExtension.Parse).ToArray();
frameCompleted = true;
}
break;
}
}
return frameCompleted;
}
/// <summary>
/// Process bytes that we've received from the other end point. Might be a partial or complete frame.
/// </summary>
/// <param name="buffer">Buffer to process</param>
/// <param name="offset">Where in buffer to start processing bytes</param>
/// <param name="bytesToProcess">Bytes available to process</param>
/// <returns>
/// Offset where the next serializer should start process (unless the offset is the same as amount of bytes
/// transferred)
/// </returns>
public bool Read(byte[] buffer, ref int offset, ref int bytesToProcess)
{
var numberOfBytesTransferredFromStart = bytesToProcess;
var frameCompleted = false;
while (bytesToProcess > 0 && !frameCompleted)
{
bool isBufferCopyCompleted;
switch (_state)
{
case HandshakeFrameState.VersionMajor:
VersionMajor = buffer[offset];
_state = HandshakeFrameState.VersionMinor;
++offset;
--bytesToProcess;
break;
case HandshakeFrameState.VersionMinor:
VersionMinor = buffer[offset];
_state = HandshakeFrameState.Flags;
++offset;
--bytesToProcess;
break;
case HandshakeFrameState.Flags:
Flags = buffer[offset];
_state = HandshakeFrameState.IdentityLength;
_receiveStateBytesLeft = 1;
++offset;
--bytesToProcess;
break;
case HandshakeFrameState.IdentityLength:
_receiveStateLength = _receiveStateBytesLeft = buffer[offset];
_state = HandshakeFrameState.Identity;
++offset;
--bytesToProcess;
break;
case HandshakeFrameState.Identity:
isBufferCopyCompleted = CopyToBuffer(buffer, ref offset, ref bytesToProcess);
if (isBufferCopyCompleted)
{
Identity = Encoding.ASCII.GetString(_receiveBuffer, 0, _receiveStateLength);
_receiveStateBytesLeft = 2;
_state = HandshakeFrameState.RequiredLength;
}
break;
case HandshakeFrameState.RequiredLength:
isBufferCopyCompleted = CopyToBuffer(buffer, ref offset, ref bytesToProcess);
if (isBufferCopyCompleted)
{
if (BitConverter.IsLittleEndian)
{
Array.Reverse(_receiveBuffer, 0, 2);
}
_receiveStateLength = _receiveStateBytesLeft = BitConverter.ToInt16(_receiveBuffer, 0);
if (_receiveStateLength == 0)
{
_state = HandshakeFrameState.OptionalLength;
_receiveStateBytesLeft = 2;
}
else
{
_state = HandshakeFrameState.Required;
}
}
break;
case HandshakeFrameState.Required:
isBufferCopyCompleted = CopyToBuffer(buffer, ref offset, ref bytesToProcess);
if (isBufferCopyCompleted)
{
var values = Encoding.ASCII.GetString(_receiveBuffer, 0, _receiveStateLength).Split(';');
RequiredExtensions = values.Select(HandshakeExtension.Parse).ToArray();
_receiveStateBytesLeft = 2;
_state = HandshakeFrameState.OptionalLength;
}
break;
case HandshakeFrameState.OptionalLength:
isBufferCopyCompleted = CopyToBuffer(buffer, ref offset, ref bytesToProcess);
if (isBufferCopyCompleted)
{
if (BitConverter.IsLittleEndian)
{
Array.Reverse(_receiveBuffer, 0, 2);
}
_receiveStateLength = _receiveStateBytesLeft = BitConverter.ToInt16(_receiveBuffer, 0);
if (_receiveStateLength == 0)
{
frameCompleted = true;
}
else
{
_state = HandshakeFrameState.Optional;
}
}
break;
case HandshakeFrameState.Optional:
isBufferCopyCompleted = CopyToBuffer(buffer, ref offset, ref bytesToProcess);
if (isBufferCopyCompleted)
{
var values = Encoding.ASCII.GetString(_receiveBuffer, 0, _receiveStateLength).Split(';');
OptionalExtensions = values.Select(HandshakeExtension.Parse).ToArray();
frameCompleted = true;
}
break;
}
}
return(frameCompleted);
}
