private static extern SafeFileHandle CreateFile()

in Amazon.KinesisTap.Hosting/FileSystemUtility.cs [151:220]
61 lines of code
4 McCabe index (conditional complexity)

        private static extern SafeFileHandle CreateFile(
            string lpFileName,
            FileAccessDword dwDesiredAccess,
            FileShareDword dwShareMode,
            IntPtr lpSecurityAttributes,
            CreationDispositionDword dwCreationDisposition,
            FileAttributesDword dwFlagsAndAttributes,
            IntPtr hTemplateFile);

        /// <summary>
        /// API binding for DeviceIoControl function (https://docs.microsoft.com/en-us/windows/win32/api/ioapiset/nf-ioapiset-deviceiocontrol?redirectedfrom=MSDN).
        /// </summary>
        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern bool DeviceIoControl(IntPtr hDevice, uint dwIoControlCode,
            IntPtr lpInBuffer, int nInBufferSize,
            IntPtr lpOutBuffer, int nOutBufferSize,
            out int lpBytesReturned, IntPtr lpOverlapped);

        /// <summary>
        /// Struct to store reparse data per https://docs.microsoft.com/en-us/windows-hardware/drivers/ddi/ntifs/ns-ntifs-_reparse_data_buffer.
        /// </summary>
        [StructLayout(LayoutKind.Sequential)]
        private struct REPARSE_DATA_BUFFER
        {
            /// <summary>
            /// Reparse point tag. Must be a Microsoft reparse point tag.
            /// </summary>
            public uint ReparseTag;

            /// <summary>
            /// Size, in bytes, of the reparse data in the buffer that DataBuffer points to.
            /// </summary>
            public ushort ReparseDataLength;

            /// <summary>
            /// Length, in bytes, of the unparsed portion of the file name pointed to by the FileName member of the associated file object.
            /// </summary>
            public ushort Reserved;

            /// <summary>
            /// Offset, in bytes, of the substitute name string in the PathBuffer array.
            /// </summary>
            public ushort SubstituteNameOffset;

            /// <summary>
            /// Length, in bytes, of the substitute name string. If this string is null-terminated,
            /// SubstituteNameLength does not include space for the null character.
            /// </summary>
            public ushort SubstituteNameLength;

            /// <summary>
            /// Offset, in bytes, of the print name string in the PathBuffer array.
            /// </summary>
            public ushort PrintNameOffset;

            /// <summary>
            /// Length, in bytes, of the print name string. If this string is null-terminated,
            /// PrintNameLength does not include space for the null character. 
            /// </summary>
            public ushort PrintNameLength;

            /// <summary>
            /// A buffer containing the unicode-encoded path string.
            /// </summary>
            /// <remarks>
            /// The size of this buffer is set so that the entire struct has size MAXIMUM_REPARSE_DATA_BUFFER_SIZE (which is 16*1024).
            /// </remarks>
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 0x3FF0)]
            public byte[] PathBuffer;
        }