#define IOCTL_GETSTATUS 0x0001
#define IOCTL_SETSTATUS 0x0002
#define IOCTL_SETBUFFERMODE 0x0003
#define IOCTL_GETBUFFERMODE 0x0004
#define IOCTL_GETOUTBUFSIZE 0x0005
#define IOCTL_SETOUTBUFSIZE 0x0006
#define IOCTL_GETINBUFSIZE 0x0007
#define IOCTL_SETINBUFSIZE 0x0008
#define IOCTL_FLUSHOUTBUF 0x0009
#define IOCTL_GETFILESIZE 0x000A
#define IOCTL_GETOUTBUFCOUNT 0x000B
#define IOCTL_GETINBUFCOUNT 0x000C