WebSocketValidate.cs

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namespace System.Net.WebSockets;
 
internal static class WebSocketValidate
{
    internal static void ValidateSubprotocol(string subProtocol)
    {
        if (string.IsNullOrWhiteSpace(subProtocol))
        {
            throw new ArgumentException(System.SR.net_WebSockets_InvalidEmptySubProtocol, "subProtocol");
        }
        string text = null;
        for (int i = 0; i < subProtocol.Length; i++)
        {
            char c = subProtocol[i];
            if (c < '!' || c > '~')
            {
                text = $"[{c}]";
                break;
            }
            if (!char.IsLetterOrDigit(c) && "()<>@,;:\\\"/[]?={} ".IndexOf(c) >= 0)
            {
                text = c.ToString();
                break;
            }
        }
        if (text != null)
        {
            throw new ArgumentException(System.SR.Format(System.SR.net_WebSockets_InvalidCharInProtocolString, subProtocol, text), "subProtocol");
        }
    }
 
    internal static void ValidateArraySegment(ArraySegment<byte> arraySegment, string parameterName)
    {
        if (arraySegment.Array == null)
        {
            throw new ArgumentNullException(parameterName + ".Array");
        }
        if (arraySegment.Offset < 0 || arraySegment.Offset > arraySegment.Array.Length)
        {
            throw new ArgumentOutOfRangeException(parameterName + ".Offset");
        }
        if (arraySegment.Count < 0 || arraySegment.Count > arraySegment.Array.Length - arraySegment.Offset)
        {
            throw new ArgumentOutOfRangeException(parameterName + ".Count");
        }
    }
}