Replace libusb in the Linux/Chrome OS USB I/O path.

device/usb/usb_device_handle_unittest.cc

 // Copyright 2014 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 <stddef.h>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 232 matching lines @@
         << "Mismatch at index " << i << ".";
   }
 
   TestResultCallback release_interface;
   handle->ReleaseInterface(1, release_interface.callback());
   ASSERT_TRUE(release_interface.WaitForResult());
 
   handle->Close();
 }
 
+TEST_F(UsbDeviceHandleTest, ControlTransfer) {
+  if (!UsbTestGadget::IsTestEnabled())
+    return;
+
+  scoped_ptr<UsbTestGadget> gadget =
+      UsbTestGadget::Claim(io_thread_->task_runner());
+  ASSERT_TRUE(gadget.get());
+
+  TestOpenCallback open_device;
+  gadget->GetDevice()->Open(open_device.callback());
+  scoped_refptr<UsbDeviceHandle> handle = open_device.WaitForResult();
+  ASSERT_TRUE(handle.get());
+
+  scoped_refptr<net::IOBufferWithSize> buffer(new net::IOBufferWithSize(255));
+  TestCompletionCallback completion;
+  handle->ControlTransfer(USB_DIRECTION_INBOUND, UsbDeviceHandle::STANDARD,
+                          UsbDeviceHandle::DEVICE, 0x06, 0x0301, 0x0409, buffer,
+                          buffer->size(), 0, completion.callback());
+  completion.WaitForResult();
+  ASSERT_EQ(USB_TRANSFER_COMPLETED, completion.status());
+  const char expected_str[] = "\x18\x03G\0o\0o\0g\0l\0e\0 \0I\0n\0c\0.\0";
+  EXPECT_EQ(sizeof(expected_str) - 1, completion.transferred());
+  for (size_t i = 0; i < completion.transferred(); ++i) {
+    EXPECT_EQ(expected_str[i], buffer->data()[i]) << "Mismatch at index " << i
+                                                  << ".";
+  }
+
+  handle->Close();
+}
+
 TEST_F(UsbDeviceHandleTest, SetInterfaceAlternateSetting) {
   if (!UsbTestGadget::IsTestEnabled()) {
     return;
   }
 
   scoped_ptr<UsbTestGadget> gadget =
       UsbTestGadget::Claim(io_thread_->task_runner());
   ASSERT_TRUE(gadget.get());
   ASSERT_TRUE(gadget->SetType(UsbTestGadget::ECHO));
 
@@ skipping 13 matching lines @@
   TestResultCallback release_interface;
   handle->ReleaseInterface(2, release_interface.callback());
   ASSERT_TRUE(release_interface.WaitForResult());
 
   handle->Close();
 }
 
 }  // namespace
 
 }  // namespace device