services/device/usb/usb_descriptors_unittest.cc - chromium/src.git - Git at Google

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "services/device/usb/usb_descriptors.h"

 #include <stdint.h>

 #include <algorithm>
 #include <memory>
 #include <string>
 #include <utility>

 #include "base/bind.h"
 #include "base/strings/utf_string_conversions.h"
 #include "services/device/usb/mock_usb_device_handle.h"
 #include "testing/gtest/include/gtest/gtest.h"

 using testing::_;

 namespace device {

 using mojom::UsbControlTransferRecipient;
 using mojom::UsbControlTransferType;
 using mojom::UsbSynchronizationType;
 using mojom::UsbTransferDirection;
 using mojom::UsbTransferStatus;
 using mojom::UsbTransferType;
 using mojom::UsbUsageType;

 namespace {

 ACTION_P2(InvokeCallback, data, length) {
   size_t transferred_length = std::min(length, arg6->size());
   memcpy(arg6->front(), data, transferred_length);
   std::move(arg8).Run(UsbTransferStatus::COMPLETED, arg6, transferred_length);
 }

 void ExpectStringDescriptors(
     std::unique_ptr<std::map<uint8_t, base::string16>> string_map) {
   EXPECT_EQ(3u, string_map->size());
   EXPECT_EQ(base::ASCIIToUTF16("String 1"), (*string_map)[1]);
   EXPECT_EQ(base::ASCIIToUTF16("String 2"), (*string_map)[2]);
   EXPECT_EQ(base::ASCIIToUTF16("String 3"), (*string_map)[3]);
 }

 // clang-format off
 const uint8_t kDeviceDescriptor[] = {0x12, 0x01, 0x10, 0x03, 0xFF, 0xFF,
                                      0xFF, 0x09, 0x34, 0x12, 0x78, 0x56,
                                      0x00, 0x01, 0x01, 0x02, 0x03, 0x02};

 const uint8_t kConfig1Descriptor[] = {
     // Config 1
     0x09, 0x02, 0x38, 0x00, 0x02, 0x01, 0x01, 0x01, 0x10,
     // Interface Association (0 + 1)
     0x08, 0x0B, 0x00, 0x02, 0xFF, 0xFF, 0xFF, 0x00,
     // Interface 0
     0x09, 0x04, 0x00, 0x00, 0x03, 0x12, 0x34, 0x56, 0x02,
     // Endpoint 1 IN
     0x07, 0x05, 0x81, 0x02, 0x00, 0x02, 0x00,
     // Endpoint 2 IN
     0x07, 0x05, 0x82, 0x03, 0x00, 0x02, 0x04,
     // Endpoint 3 OUT
     0x07, 0x05, 0x03, 0x13, 0x00, 0x02, 0x04,
     // Interface 1
     0x09, 0x04, 0x01, 0x00, 0x00, 0x78, 0x9A, 0xAB, 0x03,
 };

 const uint8_t kConfig2Descriptor[] = {
     // Config 2
     0x09, 0x02, 0x29, 0x00, 0x01, 0x02, 0x04, 0x03, 0x20,
     // Interface 0 (alternate 0)
     0x09, 0x04, 0x00, 0x00, 0x00, 0xCD, 0xEF, 0x01, 0x04,
     // Interface 0 (alternate 1)
     0x09, 0x04, 0x00, 0x01, 0x02, 0xCD, 0xEF, 0x01, 0x05,
     // Endpoint 1 IN
     0x07, 0x05, 0x81, 0x01, 0x00, 0x04, 0x08,
     // Endpoint 2 OUT
     0x07, 0x05, 0x02, 0x11, 0x00, 0x04, 0x08,
 };
 // clang-format on

 void ExpectConfig1Info(const mojom::UsbConfigurationInfo& config) {
   // Config 1
   EXPECT_EQ(1, config.configuration_value);
   EXPECT_FALSE(config.self_powered);
   EXPECT_FALSE(config.remote_wakeup);
   EXPECT_EQ(16, config.maximum_power);
   ASSERT_EQ(2u, config.interfaces.size());
   EXPECT_EQ(8u, config.extra_data.size());
   // Interface 0
   EXPECT_EQ(0, config.interfaces[0]->interface_number);
   EXPECT_EQ(0, config.interfaces[0]->first_interface);
   const auto& alternate = config.interfaces[0]->alternates[0];
   EXPECT_EQ(0, alternate->alternate_setting);
   EXPECT_EQ(0x12, alternate->class_code);
   EXPECT_EQ(0x34, alternate->subclass_code);
   EXPECT_EQ(0x56, alternate->protocol_code);
   ASSERT_EQ(3u, alternate->endpoints.size());
   EXPECT_EQ(0u, alternate->extra_data.size());

   // Endpoint 1 IN
   EXPECT_EQ(0x01, alternate->endpoints[0]->endpoint_number);
   EXPECT_EQ(UsbTransferDirection::INBOUND, alternate->endpoints[0]->direction);
   EXPECT_EQ(512u, alternate->endpoints[0]->packet_size);
   EXPECT_EQ(UsbSynchronizationType::NONE,
             alternate->endpoints[0]->synchronization_type);
   EXPECT_EQ(UsbTransferType::BULK, alternate->endpoints[0]->type);
   EXPECT_EQ(UsbUsageType::RESERVED, alternate->endpoints[0]->usage_type);
   EXPECT_EQ(0, alternate->endpoints[0]->polling_interval);
   EXPECT_EQ(0u, alternate->endpoints[0]->extra_data.size());
   // Endpoint 2 IN
   EXPECT_EQ(0x02, alternate->endpoints[1]->endpoint_number);
   EXPECT_EQ(UsbTransferDirection::INBOUND, alternate->endpoints[1]->direction);
   EXPECT_EQ(512u, alternate->endpoints[1]->packet_size);
   EXPECT_EQ(UsbSynchronizationType::NONE,
             alternate->endpoints[1]->synchronization_type);
   EXPECT_EQ(UsbTransferType::INTERRUPT, alternate->endpoints[1]->type);
   EXPECT_EQ(UsbUsageType::PERIODIC, alternate->endpoints[1]->usage_type);
   EXPECT_EQ(4, alternate->endpoints[1]->polling_interval);
   EXPECT_EQ(0u, alternate->endpoints[1]->extra_data.size());
   // Endpoint 3 OUT
   EXPECT_EQ(0x03, alternate->endpoints[2]->endpoint_number);
   EXPECT_EQ(UsbTransferDirection::OUTBOUND, alternate->endpoints[2]->direction);
   EXPECT_EQ(512u,
             config.interfaces[0]->alternates[0]->endpoints[2]->packet_size);
   EXPECT_EQ(UsbSynchronizationType::NONE,
             alternate->endpoints[2]->synchronization_type);
   EXPECT_EQ(UsbTransferType::INTERRUPT, alternate->endpoints[2]->type);
   EXPECT_EQ(UsbUsageType::NOTIFICATION, alternate->endpoints[2]->usage_type);
   EXPECT_EQ(4, alternate->endpoints[2]->polling_interval);
   EXPECT_EQ(0u, alternate->endpoints[2]->extra_data.size());
   // Interface 1
   EXPECT_EQ(1, config.interfaces[1]->interface_number);
   EXPECT_EQ(0, config.interfaces[1]->first_interface);
   EXPECT_EQ(0, config.interfaces[1]->alternates[0]->alternate_setting);
   EXPECT_EQ(0x78, config.interfaces[1]->alternates[0]->class_code);
   EXPECT_EQ(0x9A, config.interfaces[1]->alternates[0]->subclass_code);
   EXPECT_EQ(0xAB, config.interfaces[1]->alternates[0]->protocol_code);
   ASSERT_EQ(0u, config.interfaces[1]->alternates[0]->endpoints.size());
   EXPECT_EQ(0u, config.interfaces[1]->alternates[0]->extra_data.size());
 }

 void ExpectConfig2Info(const mojom::UsbConfigurationInfo& config) {
   // Config 2
   EXPECT_EQ(2, config.configuration_value);
   EXPECT_TRUE(config.self_powered);
   EXPECT_FALSE(config.remote_wakeup);
   EXPECT_EQ(32, config.maximum_power);
   ASSERT_EQ(1u, config.interfaces.size());
   ASSERT_EQ(2u, config.interfaces[0]->alternates.size());
   EXPECT_EQ(0u, config.extra_data.size());
   // Interface 0
   EXPECT_EQ(0, config.interfaces[0]->interface_number);
   EXPECT_EQ(0, config.interfaces[0]->alternates[0]->alternate_setting);
   EXPECT_EQ(0xCD, config.interfaces[0]->alternates[0]->class_code);
   EXPECT_EQ(0xEF, config.interfaces[0]->alternates[0]->subclass_code);
   EXPECT_EQ(0x01, config.interfaces[0]->alternates[0]->protocol_code);
   ASSERT_EQ(0u, config.interfaces[0]->alternates[0]->endpoints.size());
   EXPECT_EQ(0u, config.interfaces[0]->alternates[0]->extra_data.size());
   EXPECT_EQ(0, config.interfaces[0]->first_interface);
   // Interface 0 (alternate 1)
   const auto& alternate = config.interfaces[0]->alternates[1];
   EXPECT_EQ(1, alternate->alternate_setting);
   EXPECT_EQ(0xCD, alternate->class_code);
   EXPECT_EQ(0xEF, alternate->subclass_code);
   EXPECT_EQ(0x01, alternate->protocol_code);
   ASSERT_EQ(2u, alternate->endpoints.size());
   EXPECT_EQ(0u, alternate->extra_data.size());
   // Endpoint 1 IN
   EXPECT_EQ(0x01, alternate->endpoints[0]->endpoint_number);
   EXPECT_EQ(UsbTransferDirection::INBOUND, alternate->endpoints[0]->direction);
   EXPECT_EQ(1024u, alternate->endpoints[0]->packet_size);
   EXPECT_EQ(UsbSynchronizationType::NONE,
             alternate->endpoints[0]->synchronization_type);
   EXPECT_EQ(UsbTransferType::ISOCHRONOUS, alternate->endpoints[0]->type);
   EXPECT_EQ(UsbUsageType::DATA, alternate->endpoints[0]->usage_type);
   EXPECT_EQ(8, alternate->endpoints[0]->polling_interval);
   EXPECT_EQ(0u, alternate->endpoints[0]->extra_data.size());
   // Endpoint 2 OUT
   EXPECT_EQ(0x02, alternate->endpoints[1]->endpoint_number);
   EXPECT_EQ(UsbTransferDirection::OUTBOUND, alternate->endpoints[1]->direction);
   EXPECT_EQ(1024u, alternate->endpoints[1]->packet_size);
   EXPECT_EQ(UsbSynchronizationType::NONE,
             alternate->endpoints[1]->synchronization_type);
   EXPECT_EQ(UsbTransferType::ISOCHRONOUS, alternate->endpoints[1]->type);
   EXPECT_EQ(UsbUsageType::FEEDBACK, alternate->endpoints[1]->usage_type);
   EXPECT_EQ(8, alternate->endpoints[1]->polling_interval);
   EXPECT_EQ(0u, alternate->endpoints[1]->extra_data.size());
 }

 void ExpectDeviceDescriptor(const UsbDeviceDescriptor& descriptor) {
   // Device
   EXPECT_EQ(0x03, descriptor.device_info->usb_version_major);
   EXPECT_EQ(0x01, descriptor.device_info->usb_version_minor);
   EXPECT_EQ(0x00, descriptor.device_info->usb_version_subminor);
   EXPECT_EQ(0xFF, descriptor.device_info->class_code);
   EXPECT_EQ(0xFF, descriptor.device_info->subclass_code);
   EXPECT_EQ(0xFF, descriptor.device_info->protocol_code);
   EXPECT_EQ(0x1234, descriptor.device_info->vendor_id);
   EXPECT_EQ(0x5678, descriptor.device_info->product_id);
   EXPECT_EQ(0x01, descriptor.device_info->device_version_major);
   EXPECT_EQ(0x00, descriptor.device_info->device_version_minor);
   EXPECT_EQ(0x00, descriptor.device_info->device_version_subminor);
   ASSERT_EQ(2u, descriptor.device_info->configurations.size());
   ExpectConfig1Info(*descriptor.device_info->configurations[0]);
   ExpectConfig2Info(*descriptor.device_info->configurations[1]);
 }

 void OnReadDescriptors(std::unique_ptr<UsbDeviceDescriptor> descriptor) {
   ASSERT_TRUE(descriptor);
   ExpectDeviceDescriptor(*descriptor);
 }

 class UsbDescriptorsTest : public ::testing::Test {};

 TEST_F(UsbDescriptorsTest, ParseDescriptor) {
   std::vector<uint8_t> buffer;
   buffer.insert(buffer.end(), kDeviceDescriptor,
                 kDeviceDescriptor + sizeof(kDeviceDescriptor));
   buffer.insert(buffer.end(), kConfig1Descriptor,
                 kConfig1Descriptor + sizeof(kConfig1Descriptor));
   buffer.insert(buffer.end(), kConfig2Descriptor,
                 kConfig2Descriptor + sizeof(kConfig2Descriptor));

   UsbDeviceDescriptor descriptor;
   ASSERT_TRUE(descriptor.Parse(buffer));
   ExpectDeviceDescriptor(descriptor);
 }

 TEST_F(UsbDescriptorsTest, ReadDescriptors) {
   scoped_refptr<MockUsbDeviceHandle> device_handle(
       new MockUsbDeviceHandle(nullptr));
   EXPECT_CALL(*device_handle,
               ControlTransferInternal(UsbTransferDirection::INBOUND,
                                       UsbControlTransferType::STANDARD,
                                       UsbControlTransferRecipient::DEVICE, 0x06,
                                       0x0100, 0x0000, _, _, _))
       .WillOnce(InvokeCallback(kDeviceDescriptor, sizeof(kDeviceDescriptor)));
   EXPECT_CALL(*device_handle,
               ControlTransferInternal(UsbTransferDirection::INBOUND,
                                       UsbControlTransferType::STANDARD,
                                       UsbControlTransferRecipient::DEVICE, 0x06,
                                       0x0200, 0x0000, _, _, _))
       .Times(2)
       .WillRepeatedly(
           InvokeCallback(kConfig1Descriptor, sizeof(kConfig1Descriptor)));
   EXPECT_CALL(*device_handle,
               ControlTransferInternal(UsbTransferDirection::INBOUND,
                                       UsbControlTransferType::STANDARD,
                                       UsbControlTransferRecipient::DEVICE, 0x06,
                                       0x0201, 0x0000, _, _, _))
       .Times(2)
       .WillRepeatedly(
           InvokeCallback(kConfig2Descriptor, sizeof(kConfig2Descriptor)));

   ReadUsbDescriptors(device_handle, base::BindOnce(&OnReadDescriptors));
 }

 TEST_F(UsbDescriptorsTest, NoInterfaceAssociations) {
   mojom::UsbConfigurationInfoPtr config =
       BuildUsbConfigurationInfoPtr(1, false, false, 0);
   config->interfaces.push_back(BuildUsbInterfaceInfoPtr(0, 0, 255, 255, 255));
   config->interfaces.push_back(BuildUsbInterfaceInfoPtr(0, 1, 255, 255, 255));
   config->interfaces.push_back(BuildUsbInterfaceInfoPtr(1, 0, 255, 255, 255));
   AssignFirstInterfaceNumbers(config.get());

   EXPECT_EQ(0, config->interfaces[0]->first_interface);
   EXPECT_EQ(0, config->interfaces[1]->first_interface);
   EXPECT_EQ(1, config->interfaces[2]->first_interface);
 }

 TEST_F(UsbDescriptorsTest, InterfaceAssociations) {
   // Links interfaces 0 and 1 into a single function.
   static const uint8_t kIAD1[] = {0x08, 0x0b, 0x00, 0x02,
                                   0xff, 0xff, 0xff, 0x00};
   // Only references a single interface, 2.
   static const uint8_t kIAD2[] = {0x08, 0x0b, 0x02, 0x01,
                                   0xff, 0xff, 0xff, 0x00};
   // Malformed. References interface 3 but bInterfaceCount is 0.
   static const uint8_t kIAD3[] = {0x08, 0x0b, 0x03, 0x00,
                                   0xff, 0xff, 0xff, 0x00};
   // Links interfaces 4 and 5 into a single function.
   static const uint8_t kIAD4[] = {0x08, 0x0b, 0x04, 0x02,
                                   0xff, 0xff, 0xff, 0x00};

   mojom::UsbConfigurationInfoPtr config =
       BuildUsbConfigurationInfoPtr(1, false, false, 0);
   config->extra_data.assign(kIAD1, kIAD1 + sizeof(kIAD1));
   config->extra_data.insert(config->extra_data.end(), kIAD2,
                             kIAD2 + sizeof(kIAD2));
   config->interfaces.push_back(BuildUsbInterfaceInfoPtr(0, 0, 255, 255, 255));
   config->interfaces.push_back(BuildUsbInterfaceInfoPtr(1, 0, 255, 255, 255));
   mojom::UsbInterfaceInfoPtr iface1a =
       BuildUsbInterfaceInfoPtr(1, 1, 255, 255, 255);
   iface1a->alternates[0]->extra_data.assign(kIAD3, kIAD3 + sizeof(kIAD3));
   config->interfaces.push_back(std::move(iface1a));
   config->interfaces.push_back(BuildUsbInterfaceInfoPtr(2, 0, 255, 255, 255));
   config->interfaces.push_back(BuildUsbInterfaceInfoPtr(3, 0, 255, 255, 255));
   mojom::UsbInterfaceInfoPtr iface4 =
       BuildUsbInterfaceInfoPtr(4, 0, 255, 255, 255);
   iface4->alternates[0]->extra_data.assign(kIAD4, kIAD4 + sizeof(kIAD4));
   config->interfaces.push_back(std::move(iface4));
   config->interfaces.push_back(BuildUsbInterfaceInfoPtr(5, 0, 255, 255, 255));
   AssignFirstInterfaceNumbers(config.get());

   // Interfaces 0 and 1 (plus 1's alternate) are a single function.
   EXPECT_EQ(0, config->interfaces[0]->interface_number);
   EXPECT_EQ(0, config->interfaces[0]->first_interface);
   EXPECT_EQ(1, config->interfaces[1]->interface_number);
   EXPECT_EQ(0, config->interfaces[1]->first_interface);
   EXPECT_EQ(1, config->interfaces[2]->interface_number);
   EXPECT_EQ(0, config->interfaces[2]->first_interface);

   // Interfaces 2 and 3 are their own functions.
   EXPECT_EQ(2, config->interfaces[3]->interface_number);
   EXPECT_EQ(2, config->interfaces[3]->first_interface);
   EXPECT_EQ(3, config->interfaces[4]->interface_number);
   EXPECT_EQ(3, config->interfaces[4]->first_interface);

   // Interfaces 4 and 5 are a single function.
   EXPECT_EQ(4, config->interfaces[5]->interface_number);
   EXPECT_EQ(4, config->interfaces[5]->first_interface);
   EXPECT_EQ(5, config->interfaces[6]->interface_number);
   EXPECT_EQ(4, config->interfaces[6]->first_interface);
 }

 TEST_F(UsbDescriptorsTest, CorruptInterfaceAssociations) {
   {
     // Descriptor is too short.
     static const uint8_t kIAD[] = {0x01};
     mojom::UsbConfigurationInfoPtr config =
         BuildUsbConfigurationInfoPtr(1, false, false, 0);
     config->extra_data.assign(kIAD, kIAD + sizeof(kIAD));
     AssignFirstInterfaceNumbers(config.get());
   }
   {
     // Descriptor is too long.
     static const uint8_t kIAD[] = {0x09, 0x0b, 0x00, 0x00,
                                    0x00, 0x00, 0x00, 0x00};
     mojom::UsbConfigurationInfoPtr config =
         BuildUsbConfigurationInfoPtr(1, false, false, 0);
     config->extra_data.assign(kIAD, kIAD + sizeof(kIAD));
     AssignFirstInterfaceNumbers(config.get());
   }
   {
     // References an undefined interface.
     static const uint8_t kIAD[] = {0x08, 0x0b, 0x07, 0x00,
                                    0xff, 0xff, 0xff, 0x00};
     mojom::UsbConfigurationInfoPtr config =
         BuildUsbConfigurationInfoPtr(1, false, false, 0);
     config->interfaces.push_back(BuildUsbInterfaceInfoPtr(0, 0, 255, 255, 255));
     config->extra_data.assign(kIAD, kIAD + sizeof(kIAD));
     AssignFirstInterfaceNumbers(config.get());

     EXPECT_EQ(0, config->interfaces[0]->interface_number);
     EXPECT_EQ(0, config->interfaces[0]->first_interface);
   }
 }

 TEST_F(UsbDescriptorsTest, StringDescriptor) {
   static const uint8_t kBuffer[] = {0x1a, 0x03, 'H', 0, 'e', 0, 'l', 0, 'l', 0,
                                     'o',  0,    ' ', 0, 'w', 0, 'o', 0, 'r', 0,
                                     'l',  0,    'd', 0, '!', 0};
   base::string16 string;
   ASSERT_TRUE(ParseUsbStringDescriptor(
       std::vector<uint8_t>(kBuffer, kBuffer + sizeof(kBuffer)), &string));
   EXPECT_EQ(base::ASCIIToUTF16("Hello world!"), string);
 }

 TEST_F(UsbDescriptorsTest, ShortStringDescriptorHeader) {
   // The buffer is just too darn short.
   static const uint8_t kBuffer[] = {0x01};
   base::string16 string;
   ASSERT_FALSE(ParseUsbStringDescriptor(
       std::vector<uint8_t>(kBuffer, kBuffer + sizeof(kBuffer)), &string));
 }

 TEST_F(UsbDescriptorsTest, ShortStringDescriptor) {
   // The buffer is just too darn short.
   static const uint8_t kBuffer[] = {0x01, 0x03};
   base::string16 string;
   ASSERT_FALSE(ParseUsbStringDescriptor(
       std::vector<uint8_t>(kBuffer, kBuffer + sizeof(kBuffer)), &string));
 }

 TEST_F(UsbDescriptorsTest, OddLengthStringDescriptor) {
   // There's an extra byte at the end of the string.
   static const uint8_t kBuffer[] = {0x0d, 0x03, 'H', 0,   'e', 0,  'l',
                                     0,    'l',  0,   'o', 0,   '!'};
   base::string16 string;
   ASSERT_TRUE(ParseUsbStringDescriptor(
       std::vector<uint8_t>(kBuffer, kBuffer + sizeof(kBuffer)), &string));
   EXPECT_EQ(base::ASCIIToUTF16("Hello"), string);
 }

 TEST_F(UsbDescriptorsTest, EmptyStringDescriptor) {
   // The string is empty.
   static const uint8_t kBuffer[] = {0x02, 0x03};
   base::string16 string;
   ASSERT_TRUE(ParseUsbStringDescriptor(
       std::vector<uint8_t>(kBuffer, kBuffer + sizeof(kBuffer)), &string));
   EXPECT_EQ(base::string16(), string);
 }

 TEST_F(UsbDescriptorsTest, OneByteStringDescriptor) {
   // The string is only one byte.
   static const uint8_t kBuffer[] = {0x03, 0x03, '?'};
   base::string16 string;
   ASSERT_TRUE(ParseUsbStringDescriptor(
       std::vector<uint8_t>(kBuffer, kBuffer + sizeof(kBuffer)), &string));
   EXPECT_EQ(base::string16(), string);
 }

 TEST_F(UsbDescriptorsTest, ReadStringDescriptors) {
   std::unique_ptr<std::map<uint8_t, base::string16>> string_map(
       new std::map<uint8_t, base::string16>());
   (*string_map)[1] = base::string16();
   (*string_map)[2] = base::string16();
   (*string_map)[3] = base::string16();

   scoped_refptr<MockUsbDeviceHandle> device_handle(
       new MockUsbDeviceHandle(nullptr));
   static const uint8_t kStringDescriptor0[] = {0x04, 0x03, 0x21, 0x43};
   EXPECT_CALL(*device_handle,
               ControlTransferInternal(UsbTransferDirection::INBOUND,
                                       UsbControlTransferType::STANDARD,
                                       UsbControlTransferRecipient::DEVICE, 0x06,
                                       0x0300, 0x0000, _, _, _))
       .WillOnce(InvokeCallback(kStringDescriptor0, sizeof(kStringDescriptor0)));
   static const uint8_t kStringDescriptor1[] = {0x12, 0x03, 'S', 0, 't', 0,
                                                'r',  0,    'i', 0, 'n', 0,
                                                'g',  0,    ' ', 0, '1', 0};
   EXPECT_CALL(*device_handle,
               ControlTransferInternal(UsbTransferDirection::INBOUND,
                                       UsbControlTransferType::STANDARD,
                                       UsbControlTransferRecipient::DEVICE, 0x06,
                                       0x0301, 0x4321, _, _, _))
       .WillOnce(InvokeCallback(kStringDescriptor1, sizeof(kStringDescriptor1)));
   static const uint8_t kStringDescriptor2[] = {0x12, 0x03, 'S', 0, 't', 0,
                                                'r',  0,    'i', 0, 'n', 0,
                                                'g',  0,    ' ', 0, '2', 0};
   EXPECT_CALL(*device_handle,
               ControlTransferInternal(UsbTransferDirection::INBOUND,
                                       UsbControlTransferType::STANDARD,
                                       UsbControlTransferRecipient::DEVICE, 0x06,
                                       0x0302, 0x4321, _, _, _))
       .WillOnce(InvokeCallback(kStringDescriptor2, sizeof(kStringDescriptor2)));
   static const uint8_t kStringDescriptor3[] = {0x12, 0x03, 'S', 0, 't', 0,
                                                'r',  0,    'i', 0, 'n', 0,
                                                'g',  0,    ' ', 0, '3', 0};
   EXPECT_CALL(*device_handle,
               ControlTransferInternal(UsbTransferDirection::INBOUND,
                                       UsbControlTransferType::STANDARD,
                                       UsbControlTransferRecipient::DEVICE, 0x06,
                                       0x0303, 0x4321, _, _, _))
       .WillOnce(InvokeCallback(kStringDescriptor3, sizeof(kStringDescriptor3)));

   ReadUsbStringDescriptors(device_handle, std::move(string_map),
                            base::BindOnce(&ExpectStringDescriptors));
 }

 }  // namespace

 }  // namespace device
	// Copyright 2015 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "services/device/usb/usb_descriptors.h"

	#include <stdint.h>

	#include <algorithm>
	#include <memory>
	#include <string>
	#include <utility>

	#include "base/bind.h"
	#include "base/strings/utf_string_conversions.h"
	#include "services/device/usb/mock_usb_device_handle.h"
	#include "testing/gtest/include/gtest/gtest.h"

	using testing::_;

	namespace device {

	using mojom::UsbControlTransferRecipient;
	using mojom::UsbControlTransferType;
	using mojom::UsbSynchronizationType;
	using mojom::UsbTransferDirection;
	using mojom::UsbTransferStatus;
	using mojom::UsbTransferType;
	using mojom::UsbUsageType;

	namespace {

	ACTION_P2(InvokeCallback, data, length) {
	size_t transferred_length = std::min(length, arg6->size());
	memcpy(arg6->front(), data, transferred_length);
	std::move(arg8).Run(UsbTransferStatus::COMPLETED, arg6, transferred_length);
	}

	void ExpectStringDescriptors(
	std::unique_ptr<std::map<uint8_t, base::string16>> string_map) {
	EXPECT_EQ(3u, string_map->size());
	EXPECT_EQ(base::ASCIIToUTF16("String 1"), (*string_map)[1]);
	EXPECT_EQ(base::ASCIIToUTF16("String 2"), (*string_map)[2]);
	EXPECT_EQ(base::ASCIIToUTF16("String 3"), (*string_map)[3]);
	}

	// clang-format off
	const uint8_t kDeviceDescriptor[] = {0x12, 0x01, 0x10, 0x03, 0xFF, 0xFF,
	0xFF, 0x09, 0x34, 0x12, 0x78, 0x56,
	0x00, 0x01, 0x01, 0x02, 0x03, 0x02};

	const uint8_t kConfig1Descriptor[] = {
	// Config 1
	0x09, 0x02, 0x38, 0x00, 0x02, 0x01, 0x01, 0x01, 0x10,
	// Interface Association (0 + 1)
	0x08, 0x0B, 0x00, 0x02, 0xFF, 0xFF, 0xFF, 0x00,
	// Interface 0
	0x09, 0x04, 0x00, 0x00, 0x03, 0x12, 0x34, 0x56, 0x02,
	// Endpoint 1 IN
	0x07, 0x05, 0x81, 0x02, 0x00, 0x02, 0x00,
	// Endpoint 2 IN
	0x07, 0x05, 0x82, 0x03, 0x00, 0x02, 0x04,
	// Endpoint 3 OUT
	0x07, 0x05, 0x03, 0x13, 0x00, 0x02, 0x04,
	// Interface 1
	0x09, 0x04, 0x01, 0x00, 0x00, 0x78, 0x9A, 0xAB, 0x03,
	};

	const uint8_t kConfig2Descriptor[] = {
	// Config 2
	0x09, 0x02, 0x29, 0x00, 0x01, 0x02, 0x04, 0x03, 0x20,
	// Interface 0 (alternate 0)
	0x09, 0x04, 0x00, 0x00, 0x00, 0xCD, 0xEF, 0x01, 0x04,
	// Interface 0 (alternate 1)
	0x09, 0x04, 0x00, 0x01, 0x02, 0xCD, 0xEF, 0x01, 0x05,
	// Endpoint 1 IN
	0x07, 0x05, 0x81, 0x01, 0x00, 0x04, 0x08,
	// Endpoint 2 OUT
	0x07, 0x05, 0x02, 0x11, 0x00, 0x04, 0x08,
	};
	// clang-format on

	void ExpectConfig1Info(const mojom::UsbConfigurationInfo& config) {
	// Config 1
	EXPECT_EQ(1, config.configuration_value);
	EXPECT_FALSE(config.self_powered);
	EXPECT_FALSE(config.remote_wakeup);
	EXPECT_EQ(16, config.maximum_power);
	ASSERT_EQ(2u, config.interfaces.size());
	EXPECT_EQ(8u, config.extra_data.size());
	// Interface 0
	EXPECT_EQ(0, config.interfaces[0]->interface_number);
	EXPECT_EQ(0, config.interfaces[0]->first_interface);
	const auto& alternate = config.interfaces[0]->alternates[0];
	EXPECT_EQ(0, alternate->alternate_setting);
	EXPECT_EQ(0x12, alternate->class_code);
	EXPECT_EQ(0x34, alternate->subclass_code);
	EXPECT_EQ(0x56, alternate->protocol_code);
	ASSERT_EQ(3u, alternate->endpoints.size());
	EXPECT_EQ(0u, alternate->extra_data.size());

	// Endpoint 1 IN
	EXPECT_EQ(0x01, alternate->endpoints[0]->endpoint_number);
	EXPECT_EQ(UsbTransferDirection::INBOUND, alternate->endpoints[0]->direction);
	EXPECT_EQ(512u, alternate->endpoints[0]->packet_size);
	EXPECT_EQ(UsbSynchronizationType::NONE,
	alternate->endpoints[0]->synchronization_type);
	EXPECT_EQ(UsbTransferType::BULK, alternate->endpoints[0]->type);
	EXPECT_EQ(UsbUsageType::RESERVED, alternate->endpoints[0]->usage_type);
	EXPECT_EQ(0, alternate->endpoints[0]->polling_interval);
	EXPECT_EQ(0u, alternate->endpoints[0]->extra_data.size());
	// Endpoint 2 IN
	EXPECT_EQ(0x02, alternate->endpoints[1]->endpoint_number);
	EXPECT_EQ(UsbTransferDirection::INBOUND, alternate->endpoints[1]->direction);
	EXPECT_EQ(512u, alternate->endpoints[1]->packet_size);
	EXPECT_EQ(UsbSynchronizationType::NONE,
	alternate->endpoints[1]->synchronization_type);
	EXPECT_EQ(UsbTransferType::INTERRUPT, alternate->endpoints[1]->type);
	EXPECT_EQ(UsbUsageType::PERIODIC, alternate->endpoints[1]->usage_type);
	EXPECT_EQ(4, alternate->endpoints[1]->polling_interval);
	EXPECT_EQ(0u, alternate->endpoints[1]->extra_data.size());
	// Endpoint 3 OUT
	EXPECT_EQ(0x03, alternate->endpoints[2]->endpoint_number);
	EXPECT_EQ(UsbTransferDirection::OUTBOUND, alternate->endpoints[2]->direction);
	EXPECT_EQ(512u,
	config.interfaces[0]->alternates[0]->endpoints[2]->packet_size);
	EXPECT_EQ(UsbSynchronizationType::NONE,
	alternate->endpoints[2]->synchronization_type);
	EXPECT_EQ(UsbTransferType::INTERRUPT, alternate->endpoints[2]->type);
	EXPECT_EQ(UsbUsageType::NOTIFICATION, alternate->endpoints[2]->usage_type);
	EXPECT_EQ(4, alternate->endpoints[2]->polling_interval);
	EXPECT_EQ(0u, alternate->endpoints[2]->extra_data.size());
	// Interface 1
	EXPECT_EQ(1, config.interfaces[1]->interface_number);
	EXPECT_EQ(0, config.interfaces[1]->first_interface);
	EXPECT_EQ(0, config.interfaces[1]->alternates[0]->alternate_setting);
	EXPECT_EQ(0x78, config.interfaces[1]->alternates[0]->class_code);
	EXPECT_EQ(0x9A, config.interfaces[1]->alternates[0]->subclass_code);
	EXPECT_EQ(0xAB, config.interfaces[1]->alternates[0]->protocol_code);
	ASSERT_EQ(0u, config.interfaces[1]->alternates[0]->endpoints.size());
	EXPECT_EQ(0u, config.interfaces[1]->alternates[0]->extra_data.size());
	}

	void ExpectConfig2Info(const mojom::UsbConfigurationInfo& config) {
	// Config 2
	EXPECT_EQ(2, config.configuration_value);
	EXPECT_TRUE(config.self_powered);
	EXPECT_FALSE(config.remote_wakeup);
	EXPECT_EQ(32, config.maximum_power);
	ASSERT_EQ(1u, config.interfaces.size());
	ASSERT_EQ(2u, config.interfaces[0]->alternates.size());
	EXPECT_EQ(0u, config.extra_data.size());
	// Interface 0
	EXPECT_EQ(0, config.interfaces[0]->interface_number);
	EXPECT_EQ(0, config.interfaces[0]->alternates[0]->alternate_setting);
	EXPECT_EQ(0xCD, config.interfaces[0]->alternates[0]->class_code);
	EXPECT_EQ(0xEF, config.interfaces[0]->alternates[0]->subclass_code);
	EXPECT_EQ(0x01, config.interfaces[0]->alternates[0]->protocol_code);
	ASSERT_EQ(0u, config.interfaces[0]->alternates[0]->endpoints.size());
	EXPECT_EQ(0u, config.interfaces[0]->alternates[0]->extra_data.size());
	EXPECT_EQ(0, config.interfaces[0]->first_interface);
	// Interface 0 (alternate 1)
	const auto& alternate = config.interfaces[0]->alternates[1];
	EXPECT_EQ(1, alternate->alternate_setting);
	EXPECT_EQ(0xCD, alternate->class_code);
	EXPECT_EQ(0xEF, alternate->subclass_code);
	EXPECT_EQ(0x01, alternate->protocol_code);
	ASSERT_EQ(2u, alternate->endpoints.size());
	EXPECT_EQ(0u, alternate->extra_data.size());
	// Endpoint 1 IN
	EXPECT_EQ(0x01, alternate->endpoints[0]->endpoint_number);
	EXPECT_EQ(UsbTransferDirection::INBOUND, alternate->endpoints[0]->direction);
	EXPECT_EQ(1024u, alternate->endpoints[0]->packet_size);
	EXPECT_EQ(UsbSynchronizationType::NONE,
	alternate->endpoints[0]->synchronization_type);
	EXPECT_EQ(UsbTransferType::ISOCHRONOUS, alternate->endpoints[0]->type);
	EXPECT_EQ(UsbUsageType::DATA, alternate->endpoints[0]->usage_type);
	EXPECT_EQ(8, alternate->endpoints[0]->polling_interval);
	EXPECT_EQ(0u, alternate->endpoints[0]->extra_data.size());
	// Endpoint 2 OUT
	EXPECT_EQ(0x02, alternate->endpoints[1]->endpoint_number);
	EXPECT_EQ(UsbTransferDirection::OUTBOUND, alternate->endpoints[1]->direction);
	EXPECT_EQ(1024u, alternate->endpoints[1]->packet_size);
	EXPECT_EQ(UsbSynchronizationType::NONE,
	alternate->endpoints[1]->synchronization_type);
	EXPECT_EQ(UsbTransferType::ISOCHRONOUS, alternate->endpoints[1]->type);
	EXPECT_EQ(UsbUsageType::FEEDBACK, alternate->endpoints[1]->usage_type);
	EXPECT_EQ(8, alternate->endpoints[1]->polling_interval);
	EXPECT_EQ(0u, alternate->endpoints[1]->extra_data.size());
	}

	void ExpectDeviceDescriptor(const UsbDeviceDescriptor& descriptor) {
	// Device
	EXPECT_EQ(0x03, descriptor.device_info->usb_version_major);
	EXPECT_EQ(0x01, descriptor.device_info->usb_version_minor);
	EXPECT_EQ(0x00, descriptor.device_info->usb_version_subminor);
	EXPECT_EQ(0xFF, descriptor.device_info->class_code);
	EXPECT_EQ(0xFF, descriptor.device_info->subclass_code);
	EXPECT_EQ(0xFF, descriptor.device_info->protocol_code);
	EXPECT_EQ(0x1234, descriptor.device_info->vendor_id);
	EXPECT_EQ(0x5678, descriptor.device_info->product_id);
	EXPECT_EQ(0x01, descriptor.device_info->device_version_major);
	EXPECT_EQ(0x00, descriptor.device_info->device_version_minor);
	EXPECT_EQ(0x00, descriptor.device_info->device_version_subminor);
	ASSERT_EQ(2u, descriptor.device_info->configurations.size());
	ExpectConfig1Info(*descriptor.device_info->configurations[0]);
	ExpectConfig2Info(*descriptor.device_info->configurations[1]);
	}

	void OnReadDescriptors(std::unique_ptr<UsbDeviceDescriptor> descriptor) {
	ASSERT_TRUE(descriptor);
	ExpectDeviceDescriptor(*descriptor);
	}

	class UsbDescriptorsTest : public ::testing::Test {};

	TEST_F(UsbDescriptorsTest, ParseDescriptor) {
	std::vector<uint8_t> buffer;
	buffer.insert(buffer.end(), kDeviceDescriptor,
	kDeviceDescriptor + sizeof(kDeviceDescriptor));
	buffer.insert(buffer.end(), kConfig1Descriptor,
	kConfig1Descriptor + sizeof(kConfig1Descriptor));
	buffer.insert(buffer.end(), kConfig2Descriptor,
	kConfig2Descriptor + sizeof(kConfig2Descriptor));

	UsbDeviceDescriptor descriptor;
	ASSERT_TRUE(descriptor.Parse(buffer));
	ExpectDeviceDescriptor(descriptor);
	}

	TEST_F(UsbDescriptorsTest, ReadDescriptors) {
	scoped_refptr<MockUsbDeviceHandle> device_handle(
	new MockUsbDeviceHandle(nullptr));
	EXPECT_CALL(*device_handle,
	ControlTransferInternal(UsbTransferDirection::INBOUND,
	UsbControlTransferType::STANDARD,
	UsbControlTransferRecipient::DEVICE, 0x06,
	0x0100, 0x0000, _, _, _))
	.WillOnce(InvokeCallback(kDeviceDescriptor, sizeof(kDeviceDescriptor)));
	EXPECT_CALL(*device_handle,
	ControlTransferInternal(UsbTransferDirection::INBOUND,
	UsbControlTransferType::STANDARD,
	UsbControlTransferRecipient::DEVICE, 0x06,
	0x0200, 0x0000, _, _, _))
	.Times(2)
	.WillRepeatedly(
	InvokeCallback(kConfig1Descriptor, sizeof(kConfig1Descriptor)));
	EXPECT_CALL(*device_handle,
	ControlTransferInternal(UsbTransferDirection::INBOUND,
	UsbControlTransferType::STANDARD,
	UsbControlTransferRecipient::DEVICE, 0x06,
	0x0201, 0x0000, _, _, _))
	.Times(2)
	.WillRepeatedly(
	InvokeCallback(kConfig2Descriptor, sizeof(kConfig2Descriptor)));

	ReadUsbDescriptors(device_handle, base::BindOnce(&OnReadDescriptors));
	}

	TEST_F(UsbDescriptorsTest, NoInterfaceAssociations) {
	mojom::UsbConfigurationInfoPtr config =
	BuildUsbConfigurationInfoPtr(1, false, false, 0);
	config->interfaces.push_back(BuildUsbInterfaceInfoPtr(0, 0, 255, 255, 255));
	config->interfaces.push_back(BuildUsbInterfaceInfoPtr(0, 1, 255, 255, 255));
	config->interfaces.push_back(BuildUsbInterfaceInfoPtr(1, 0, 255, 255, 255));
	AssignFirstInterfaceNumbers(config.get());

	EXPECT_EQ(0, config->interfaces[0]->first_interface);
	EXPECT_EQ(0, config->interfaces[1]->first_interface);
	EXPECT_EQ(1, config->interfaces[2]->first_interface);
	}

	TEST_F(UsbDescriptorsTest, InterfaceAssociations) {
	// Links interfaces 0 and 1 into a single function.
	static const uint8_t kIAD1[] = {0x08, 0x0b, 0x00, 0x02,
	0xff, 0xff, 0xff, 0x00};
	// Only references a single interface, 2.
	static const uint8_t kIAD2[] = {0x08, 0x0b, 0x02, 0x01,
	0xff, 0xff, 0xff, 0x00};
	// Malformed. References interface 3 but bInterfaceCount is 0.
	static const uint8_t kIAD3[] = {0x08, 0x0b, 0x03, 0x00,
	0xff, 0xff, 0xff, 0x00};
	// Links interfaces 4 and 5 into a single function.
	static const uint8_t kIAD4[] = {0x08, 0x0b, 0x04, 0x02,
	0xff, 0xff, 0xff, 0x00};

	mojom::UsbConfigurationInfoPtr config =
	BuildUsbConfigurationInfoPtr(1, false, false, 0);
	config->extra_data.assign(kIAD1, kIAD1 + sizeof(kIAD1));
	config->extra_data.insert(config->extra_data.end(), kIAD2,
	kIAD2 + sizeof(kIAD2));
	config->interfaces.push_back(BuildUsbInterfaceInfoPtr(0, 0, 255, 255, 255));
	config->interfaces.push_back(BuildUsbInterfaceInfoPtr(1, 0, 255, 255, 255));
	mojom::UsbInterfaceInfoPtr iface1a =
	BuildUsbInterfaceInfoPtr(1, 1, 255, 255, 255);
	iface1a->alternates[0]->extra_data.assign(kIAD3, kIAD3 + sizeof(kIAD3));
	config->interfaces.push_back(std::move(iface1a));
	config->interfaces.push_back(BuildUsbInterfaceInfoPtr(2, 0, 255, 255, 255));
	config->interfaces.push_back(BuildUsbInterfaceInfoPtr(3, 0, 255, 255, 255));
	mojom::UsbInterfaceInfoPtr iface4 =
	BuildUsbInterfaceInfoPtr(4, 0, 255, 255, 255);
	iface4->alternates[0]->extra_data.assign(kIAD4, kIAD4 + sizeof(kIAD4));
	config->interfaces.push_back(std::move(iface4));
	config->interfaces.push_back(BuildUsbInterfaceInfoPtr(5, 0, 255, 255, 255));
	AssignFirstInterfaceNumbers(config.get());

	// Interfaces 0 and 1 (plus 1's alternate) are a single function.
	EXPECT_EQ(0, config->interfaces[0]->interface_number);
	EXPECT_EQ(0, config->interfaces[0]->first_interface);
	EXPECT_EQ(1, config->interfaces[1]->interface_number);
	EXPECT_EQ(0, config->interfaces[1]->first_interface);
	EXPECT_EQ(1, config->interfaces[2]->interface_number);
	EXPECT_EQ(0, config->interfaces[2]->first_interface);

	// Interfaces 2 and 3 are their own functions.
	EXPECT_EQ(2, config->interfaces[3]->interface_number);
	EXPECT_EQ(2, config->interfaces[3]->first_interface);
	EXPECT_EQ(3, config->interfaces[4]->interface_number);
	EXPECT_EQ(3, config->interfaces[4]->first_interface);

	// Interfaces 4 and 5 are a single function.
	EXPECT_EQ(4, config->interfaces[5]->interface_number);
	EXPECT_EQ(4, config->interfaces[5]->first_interface);
	EXPECT_EQ(5, config->interfaces[6]->interface_number);
	EXPECT_EQ(4, config->interfaces[6]->first_interface);
	}

	TEST_F(UsbDescriptorsTest, CorruptInterfaceAssociations) {
	{
	// Descriptor is too short.
	static const uint8_t kIAD[] = {0x01};
	mojom::UsbConfigurationInfoPtr config =
	BuildUsbConfigurationInfoPtr(1, false, false, 0);
	config->extra_data.assign(kIAD, kIAD + sizeof(kIAD));
	AssignFirstInterfaceNumbers(config.get());
	}
	{
	// Descriptor is too long.
	static const uint8_t kIAD[] = {0x09, 0x0b, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00};
	mojom::UsbConfigurationInfoPtr config =
	BuildUsbConfigurationInfoPtr(1, false, false, 0);
	config->extra_data.assign(kIAD, kIAD + sizeof(kIAD));
	AssignFirstInterfaceNumbers(config.get());
	}
	{
	// References an undefined interface.
	static const uint8_t kIAD[] = {0x08, 0x0b, 0x07, 0x00,
	0xff, 0xff, 0xff, 0x00};
	mojom::UsbConfigurationInfoPtr config =
	BuildUsbConfigurationInfoPtr(1, false, false, 0);
	config->interfaces.push_back(BuildUsbInterfaceInfoPtr(0, 0, 255, 255, 255));
	config->extra_data.assign(kIAD, kIAD + sizeof(kIAD));
	AssignFirstInterfaceNumbers(config.get());

	EXPECT_EQ(0, config->interfaces[0]->interface_number);
	EXPECT_EQ(0, config->interfaces[0]->first_interface);
	}
	}

	TEST_F(UsbDescriptorsTest, StringDescriptor) {
	static const uint8_t kBuffer[] = {0x1a, 0x03, 'H', 0, 'e', 0, 'l', 0, 'l', 0,
	'o', 0, ' ', 0, 'w', 0, 'o', 0, 'r', 0,
	'l', 0, 'd', 0, '!', 0};
	base::string16 string;
	ASSERT_TRUE(ParseUsbStringDescriptor(
	std::vector<uint8_t>(kBuffer, kBuffer + sizeof(kBuffer)), &string));
	EXPECT_EQ(base::ASCIIToUTF16("Hello world!"), string);
	}

	TEST_F(UsbDescriptorsTest, ShortStringDescriptorHeader) {
	// The buffer is just too darn short.
	static const uint8_t kBuffer[] = {0x01};
	base::string16 string;
	ASSERT_FALSE(ParseUsbStringDescriptor(
	std::vector<uint8_t>(kBuffer, kBuffer + sizeof(kBuffer)), &string));
	}

	TEST_F(UsbDescriptorsTest, ShortStringDescriptor) {
	// The buffer is just too darn short.
	static const uint8_t kBuffer[] = {0x01, 0x03};
	base::string16 string;
	ASSERT_FALSE(ParseUsbStringDescriptor(
	std::vector<uint8_t>(kBuffer, kBuffer + sizeof(kBuffer)), &string));
	}

	TEST_F(UsbDescriptorsTest, OddLengthStringDescriptor) {
	// There's an extra byte at the end of the string.
	static const uint8_t kBuffer[] = {0x0d, 0x03, 'H', 0, 'e', 0, 'l',
	0, 'l', 0, 'o', 0, '!'};
	base::string16 string;
	ASSERT_TRUE(ParseUsbStringDescriptor(
	std::vector<uint8_t>(kBuffer, kBuffer + sizeof(kBuffer)), &string));
	EXPECT_EQ(base::ASCIIToUTF16("Hello"), string);
	}

	TEST_F(UsbDescriptorsTest, EmptyStringDescriptor) {
	// The string is empty.
	static const uint8_t kBuffer[] = {0x02, 0x03};
	base::string16 string;
	ASSERT_TRUE(ParseUsbStringDescriptor(
	std::vector<uint8_t>(kBuffer, kBuffer + sizeof(kBuffer)), &string));
	EXPECT_EQ(base::string16(), string);
	}

	TEST_F(UsbDescriptorsTest, OneByteStringDescriptor) {
	// The string is only one byte.
	static const uint8_t kBuffer[] = {0x03, 0x03, '?'};
	base::string16 string;
	ASSERT_TRUE(ParseUsbStringDescriptor(
	std::vector<uint8_t>(kBuffer, kBuffer + sizeof(kBuffer)), &string));
	EXPECT_EQ(base::string16(), string);
	}

	TEST_F(UsbDescriptorsTest, ReadStringDescriptors) {
	std::unique_ptr<std::map<uint8_t, base::string16>> string_map(
	new std::map<uint8_t, base::string16>());
	(*string_map)[1] = base::string16();
	(*string_map)[2] = base::string16();
	(*string_map)[3] = base::string16();

	scoped_refptr<MockUsbDeviceHandle> device_handle(
	new MockUsbDeviceHandle(nullptr));
	static const uint8_t kStringDescriptor0[] = {0x04, 0x03, 0x21, 0x43};
	EXPECT_CALL(*device_handle,
	ControlTransferInternal(UsbTransferDirection::INBOUND,
	UsbControlTransferType::STANDARD,
	UsbControlTransferRecipient::DEVICE, 0x06,
	0x0300, 0x0000, _, _, _))
	.WillOnce(InvokeCallback(kStringDescriptor0, sizeof(kStringDescriptor0)));
	static const uint8_t kStringDescriptor1[] = {0x12, 0x03, 'S', 0, 't', 0,
	'r', 0, 'i', 0, 'n', 0,
	'g', 0, ' ', 0, '1', 0};
	EXPECT_CALL(*device_handle,
	ControlTransferInternal(UsbTransferDirection::INBOUND,
	UsbControlTransferType::STANDARD,
	UsbControlTransferRecipient::DEVICE, 0x06,
	0x0301, 0x4321, _, _, _))
	.WillOnce(InvokeCallback(kStringDescriptor1, sizeof(kStringDescriptor1)));
	static const uint8_t kStringDescriptor2[] = {0x12, 0x03, 'S', 0, 't', 0,
	'r', 0, 'i', 0, 'n', 0,
	'g', 0, ' ', 0, '2', 0};
	EXPECT_CALL(*device_handle,
	ControlTransferInternal(UsbTransferDirection::INBOUND,
	UsbControlTransferType::STANDARD,
	UsbControlTransferRecipient::DEVICE, 0x06,
	0x0302, 0x4321, _, _, _))
	.WillOnce(InvokeCallback(kStringDescriptor2, sizeof(kStringDescriptor2)));
	static const uint8_t kStringDescriptor3[] = {0x12, 0x03, 'S', 0, 't', 0,
	'r', 0, 'i', 0, 'n', 0,
	'g', 0, ' ', 0, '3', 0};
	EXPECT_CALL(*device_handle,
	ControlTransferInternal(UsbTransferDirection::INBOUND,
	UsbControlTransferType::STANDARD,
	UsbControlTransferRecipient::DEVICE, 0x06,
	0x0303, 0x4321, _, _, _))
	.WillOnce(InvokeCallback(kStringDescriptor3, sizeof(kStringDescriptor3)));

	ReadUsbStringDescriptors(device_handle, std::move(string_map),
	base::BindOnce(&ExpectStringDescriptors));
	}

	} // namespace

	} // namespace device