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#!/usr/bin/env python
# Copyright 2014 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import unittest
import hid_constants
import usb_descriptors
class DescriptorWithField(usb_descriptors.Descriptor):
pass
DescriptorWithField.AddField('bField', 'B')
class DescriptorWithDefault(usb_descriptors.Descriptor):
pass
DescriptorWithDefault.AddField('bDefault', 'B', default=42)
class DescriptorWithFixed(usb_descriptors.Descriptor):
pass
DescriptorWithFixed.AddFixedField('bFixed', 'B', 42)
class DescriptorWithComputed(usb_descriptors.Descriptor):
@property
def foo(self):
return 42
DescriptorWithComputed.AddComputedField('bComputed', 'B', 'foo')
class DescriptorWithDescriptors(usb_descriptors.DescriptorContainer):
pass
DescriptorWithDescriptors.AddField('bType', 'B')
class DescriptorTest(unittest.TestCase):
def test_default(self):
obj = DescriptorWithDefault()
self.assertEquals(obj.bDefault, 42)
def test_change_default(self):
obj = DescriptorWithDefault()
obj.bDefault = 1
self.assertEquals(obj.bDefault, 1)
def test_override_default(self):
obj = DescriptorWithDefault(bDefault=56)
self.assertEquals(obj.bDefault, 56)
def test_fixed(self):
obj = DescriptorWithFixed()
self.assertEquals(obj.bFixed, 42)
def test_set_fixed(self):
with self.assertRaises(RuntimeError):
DescriptorWithFixed(bFixed=1)
def test_modify_fixed(self):
obj = DescriptorWithFixed()
with self.assertRaises(RuntimeError):
obj.bFixed = 1
def test_computed(self):
obj = DescriptorWithComputed()
self.assertEquals(obj.bComputed, 42)
def test_set_computed(self):
with self.assertRaises(RuntimeError):
DescriptorWithComputed(bComputed=1)
def test_modify_computed(self):
obj = DescriptorWithComputed()
with self.assertRaises(RuntimeError):
obj.bComputed = 1
def test_unexpected(self):
with self.assertRaisesRegexp(TypeError, 'Unexpected'):
DescriptorWithField(bUnexpected=1)
def test_missing(self):
with self.assertRaisesRegexp(TypeError, 'Missing'):
DescriptorWithField()
def test_size(self):
obj = DescriptorWithField(bField=42)
self.assertEquals(obj.struct_size, 1)
self.assertEquals(obj.total_size, 1)
def test_encode(self):
obj = DescriptorWithField(bField=0xff)
self.assertEquals(obj.Encode(), '\xff')
def test_string(self):
obj = DescriptorWithField(bField=42)
string = str(obj)
self.assertIn('bField', string)
self.assertIn('42', string)
def test_container(self):
parent = DescriptorWithDescriptors(bType=0)
child1 = DescriptorWithField(bField=1)
parent.Add(child1)
child2 = DescriptorWithField(bField=2)
parent.Add(child2)
self.assertEquals(parent.total_size, 3)
self.assertEquals(parent.Encode(), '\x00\x01\x02')
string = str(parent)
self.assertIn('bType', string)
self.assertIn('bField', string)
class TestUsbDescriptors(unittest.TestCase):
def test_device_descriptor(self):
device_desc = usb_descriptors.DeviceDescriptor(
idVendor=0xDEAD,
idProduct=0xBEEF,
bcdDevice=0x0100,
bNumConfigurations=1)
self.assertEquals(
device_desc.Encode(),
'\x12\x01\x00\x02\x00\x00\x00\x40\xAD\xDE\xEF\xBE\x00\x01\x00\x00\x00'
'\x01')
def test_unique_interfaces(self):
interface_desc1 = usb_descriptors.InterfaceDescriptor(bInterfaceNumber=1)
interface_desc2 = usb_descriptors.InterfaceDescriptor(bInterfaceNumber=1,
bAlternateSetting=1)
interface_desc3 = usb_descriptors.InterfaceDescriptor(bInterfaceNumber=1)
configuration_desc = usb_descriptors.ConfigurationDescriptor(
bmAttributes=0xC0,
MaxPower=100)
configuration_desc.AddInterface(interface_desc1)
configuration_desc.AddInterface(interface_desc2)
with self.assertRaisesRegexp(RuntimeError, r'Interface 1 \(alternate 0\)'):
configuration_desc.AddInterface(interface_desc3)
def test_unique_endpoints(self):
endpoint_desc1 = usb_descriptors.EndpointDescriptor(
bEndpointAddress=0x01,
bmAttributes=0x02,
wMaxPacketSize=64,
bInterval=1)
endpoint_desc2 = usb_descriptors.EndpointDescriptor(
bEndpointAddress=0x81,
bmAttributes=0x02,
wMaxPacketSize=64,
bInterval=1)
endpoint_desc3 = usb_descriptors.EndpointDescriptor(
bEndpointAddress=0x01,
bmAttributes=0x01,
wMaxPacketSize=32,
bInterval=10)
interface_desc = usb_descriptors.InterfaceDescriptor(bInterfaceNumber=1)
interface_desc.AddEndpoint(endpoint_desc1)
interface_desc.AddEndpoint(endpoint_desc2)
with self.assertRaisesRegexp(RuntimeError, 'Endpoint 0x01 already defined'):
interface_desc.AddEndpoint(endpoint_desc3)
def test_configuration_descriptor(self):
endpoint_desc = usb_descriptors.EndpointDescriptor(
bEndpointAddress=0x01,
bmAttributes=0x02,
wMaxPacketSize=64,
bInterval=1)
encoded_endpoint = '\x07\x05\x01\x02\x40\x00\x01'
self.assertEquals(endpoint_desc.Encode(), encoded_endpoint)
interface_desc = usb_descriptors.InterfaceDescriptor(bInterfaceNumber=1)
interface_desc.AddEndpoint(endpoint_desc)
self.assertEquals([endpoint_desc], interface_desc.GetEndpoints())
encoded_interface = ('\x09\x04\x01\x00\x01\xFF\xFF\xFF\x00' +
encoded_endpoint)
self.assertEquals(interface_desc.Encode(), encoded_interface)
configuration_desc = usb_descriptors.ConfigurationDescriptor(
bmAttributes=0xC0,
MaxPower=100)
configuration_desc.AddInterface(interface_desc)
self.assertEquals([interface_desc], configuration_desc.GetInterfaces())
encoded_configuration = ('\x09\x02\x19\x00\x01\x01\x00\xC0\x64' +
encoded_interface)
self.assertEquals(configuration_desc.Encode(), encoded_configuration)
def test_encode_hid_descriptor(self):
hid_desc = usb_descriptors.HidDescriptor()
hid_desc.AddDescriptor(hid_constants.DescriptorType.REPORT, 0x80)
hid_desc.AddDescriptor(hid_constants.DescriptorType.PHYSICAL, 0x60)
encoded_desc = '\x0C\x21\x11\x01\x00\x02\x22\x80\x00\x23\x60\x00'
self.assertEquals(hid_desc.Encode(), encoded_desc)
def test_print_hid_descriptor(self):
hid_desc = usb_descriptors.HidDescriptor()
hid_desc.AddDescriptor(hid_constants.DescriptorType.REPORT, 0x80)
hid_desc.AddDescriptor(hid_constants.DescriptorType.PHYSICAL, 0x60)
string = str(hid_desc)
self.assertIn('0x22', string)
self.assertIn('0x23', string)
if __name__ == '__main__':
unittest.main()
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