FrameHeader.cs

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namespace System.Net;
 
internal sealed class FrameHeader
{
    private int _payloadSize = -1;
 
    public int MessageId { get; set; } = 22;
 
 
    public int MajorV { get; private set; } = 1;
 
 
    public int MinorV { get; private set; }
 
    public int PayloadSize
    {
        get
        {
            return _payloadSize;
        }
        set
        {
            if (value > 65535)
            {
                throw new ArgumentException(System.SR.Format(System.SR.net_frame_max_size, 65535, value), "PayloadSize");
            }
            _payloadSize = value;
        }
    }
 
    public void CopyTo(byte[] dest, int start)
    {
        dest[start++] = (byte)MessageId;
        dest[start++] = (byte)MajorV;
        dest[start++] = (byte)MinorV;
        dest[start++] = (byte)((uint)(_payloadSize >> 8) & 0xFFu);
        dest[start] = (byte)((uint)_payloadSize & 0xFFu);
    }
 
    public void CopyFrom(byte[] bytes, int start)
    {
        MessageId = bytes[start++];
        MajorV = bytes[start++];
        MinorV = bytes[start++];
        _payloadSize = (bytes[start++] << 8) | bytes[start];
    }
}