Source position: libusb.pp line 341
type libusb_request_type = (
LIBUSB_REQUEST_TYPE_STANDARD = $00 shl 5,
LIBUSB_REQUEST_TYPE_CLASS = $01 shl 5,
LIBUSB_REQUEST_TYPE_VENDOR = $02 shl 5,
LIBUSB_REQUEST_TYPE_RESERVED = $03 shl 5
);