usb1._libusb1: Add a few missing constants.

More work is needed to superspeed USB support, this is just the low-
hanging fruit.

Author: vpelletier

usb1/_libusb1.py

@@ -841,6 +841,24 @@ def libusb_le16_to_cpu(x):
 LIBUSB_DT_ENDPOINT_SIZE = 7
 LIBUSB_DT_ENDPOINT_AUDIO_SIZE = 9 # Audio extension
 LIBUSB_DT_HUB_NONVAR_SIZE = 7
+LIBUSB_DT_SS_ENDPOINT_COMPANION_SIZE = 6
+LIBUSB_DT_BOS_SIZE = 5
+LIBUSB_DT_DEVICE_CAPABILITY_SIZE = 3
+LIBUSB_DT_INTERFACE_ASSOCIATION_SIZE = 8
+
+# BOS descriptor sizes
+LIBUSB_BT_USB_2_0_EXTENSION_SIZE = 7
+LIBUSB_BT_SS_USB_DEVICE_CAPABILITY_SIZE = 10
+LIBUSB_BT_SSPLUS_USB_DEVICE_CAPABILITY_SIZE = 12
+LIBUSB_BT_CONTAINER_ID_SIZE = 20
+LIBUSB_BT_PLATFORM_DESCRIPTOR_MIN_SIZE = 20
+
+LIBUSB_DT_BOS_MAX_SIZE = (
+    LIBUSB_DT_BOS_SIZE +
+    LIBUSB_BT_USB_2_0_EXTENSION_SIZE +
+    LIBUSB_BT_SS_USB_DEVICE_CAPABILITY_SIZE +
+    LIBUSB_BT_CONTAINER_ID_SIZE
+)
 
 LIBUSB_ENDPOINT_ADDRESS_MASK = 0x0f # in bEndpointAddress
 LIBUSB_ENDPOINT_DIR_MASK = 0x80
@@ -1151,8 +1169,10 @@ class libusb_init_option(Structure):
     'LIBUSB_SPEED_HIGH': 3,
     # The device is operating at super speed (5000MBit/s).
     'LIBUSB_SPEED_SUPER': 4,
-    # The device is operating at super speed plus (10000MBit/s)
+    # The device is operating at super speed plus (10000MBit/s).
     'LIBUSB_SPEED_SUPER_PLUS': 5,
+    # The device is operating at super speed plus x2 (20000MBit/s).
+    'LIBUSB_SPEED_SUPER_PLUS_X2': 6,
 })
 
 libusb_supported_speed = Enum({