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# The MIT License (MIT)
#
# Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
from . import standard
def join_interfaces(args, *, renumber_endpoints=True):
"""Renumbers interfaces and endpoints so they are compatible.
``args`` is any number of interface sequences (usually lists with
`InterfaceDescriptor` s inside them). Interfaces within a sequence
should be numbered beginning at 0x0. Endpoints should be numbered per
interface."""
interfaces = []
base_endpoint_number = 1
for interface_set in args:
base_interface_number = len(interfaces)
for i, interface in enumerate(interface_set):
interfaces.append(interface)
interface.bInterfaceNumber = interfaces.index(interface)
max_endpoint_address = base_endpoint_number
for subdescriptor in interface.subdescriptors:
endpoint_used = False
if (subdescriptor.bDescriptorType ==
standard.EndpointDescriptor.bDescriptorType):
if renumber_endpoints:
endpoint_used = True
subdescriptor.bEndpointAddress += base_endpoint_number
endpoint_address = subdescriptor.bEndpointAddress & 0xf
max_endpoint_address = max(max_endpoint_address,
endpoint_address)
elif subdescriptor.bEndpointAddress == 0:
raise ValueError('Endpoint address must not be 0')
if endpoint_used:
base_endpoint_number = max_endpoint_address + 1
return interfaces
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