System.Net.HttpResponseStream.ComputeLeftToWrite C# (CSharp) Method

        internal Interop.HttpApi.HTTP_FLAGS ComputeLeftToWrite()
        {
            if (NetEventSource.IsEnabled) NetEventSource.Info(this, "_LeftToWrite:" + _leftToWrite);
            Interop.HttpApi.HTTP_FLAGS flags = Interop.HttpApi.HTTP_FLAGS.NONE;
            if (!_httpContext.Response.ComputedHeaders)
            {
                flags = _httpContext.Response.ComputeHeaders();
            }
            if (_leftToWrite == long.MinValue)
            {
                Interop.HttpApi.HTTP_VERB method = _httpContext.GetKnownMethod();
                _leftToWrite = method != Interop.HttpApi.HTTP_VERB.HttpVerbHEAD ? _httpContext.Response.ContentLength64 : 0;
                if (NetEventSource.IsEnabled) NetEventSource.Info(this, "_LeftToWrite:" + _leftToWrite);
            }
            return flags;
        }