/// <summary>
/// Read a G-code channel
/// </summary>
/// <param name="from">Origin</param>
/// <param name="channel">Channel that has acquired the lock</param>
/// <returns>Number of bytes read</returns>
public static int ReadCodeChannel(ReadOnlySpan <byte> from, out CodeChannel channel)
{
CodeChannelHeader header = MemoryMarshal.Cast <byte, CodeChannelHeader>(from)[0];
channel = header.Channel;
return(Marshal.SizeOf(header));
}
/// <summary>
/// Read a G-code channel
/// </summary>
/// <param name="from">Origin</param>
/// <param name="channel">Channel that has acquired the lock</param>
/// <returns>Number of bytes read</returns>
public static int ReadCodeChannel(ReadOnlySpan <byte> from, out CodeChannel channel)
{
CodeChannelHeader header = MemoryMarshal.Read <CodeChannelHeader>(from);
channel = header.Channel;
return(Marshal.SizeOf <CodeChannelHeader>());
}
/// <summary>
/// Write a G-code channel
/// </summary>
/// <param name="to">Destination</param>
/// <param name="channel">Channel for the lock request</param>
/// <returns>Number of bytes written</returns>
public static int WriteCodeChannel(Span <byte> to, CodeChannel channel)
{
CodeChannelHeader header = new CodeChannelHeader
{
Channel = channel
};
MemoryMarshal.Write(to, ref header);
return(Marshal.SizeOf(header));
}
/// <summary>
/// Write a request to evaluate an expression
/// </summary>
/// <param name="to">Destination</param>
/// <param name="channel">Where to evaluate the expression</param>
/// <param name="expression">Expression to evaluate</param>
/// <returns>Number of bytes written</returns>
public static int WriteEvaluateExpression(Span <byte> to, CodeChannel channel, string expression)
{
Span <byte> unicodeExpression = Encoding.UTF8.GetBytes(expression);
// Write header
CodeChannelHeader header = new CodeChannelHeader
{
Channel = channel
};
MemoryMarshal.Write(to, ref header);
int bytesWritten = Marshal.SizeOf(header);
// Write expression
unicodeExpression.CopyTo(to.Slice(bytesWritten));
bytesWritten += unicodeExpression.Length;
return(AddPadding(to, bytesWritten));
}
