System.Net.WebSockets.WebSocketBuffer.GetOffset C# (CSharp) Method

        private int GetOffset(IntPtr pBuffer)
        {
            Debug.Assert(pBuffer != IntPtr.Zero, "'pBuffer' MUST NOT be IntPtr.Zero.");
            int offset = (int)(pBuffer.ToInt64() - _startAddress + _internalBuffer.Offset);

            Debug.Assert(offset >= 0, "'offset' MUST NOT be negative.");
            return offset;
        }