Build a basic Mojo service framework for device/usb

device/usb/type_converters.cc

+// 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 "device/usb/type_converters.h"
+
+#include <map>
+#include <utility>
+
+#include "base/logging.h"
+#include "base/strings/utf_string_conversions.h"
+#include "device/usb/usb_device.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/array.h"
+
+namespace mojo {
+
+// static
+device::UsbDeviceFilter
+TypeConverter<device::UsbDeviceFilter, device::usb::DeviceFilterPtr>::Convert(
+    const device::usb::DeviceFilterPtr& mojo_filter) {
+  device::UsbDeviceFilter filter;
+  if (mojo_filter->has_vendor_id)
+    filter.SetVendorId(mojo_filter->vendor_id);
+  if (mojo_filter->has_product_id)
+    filter.SetProductId(mojo_filter->product_id);
+  if (mojo_filter->has_class_code)
+    filter.SetInterfaceClass(mojo_filter->class_code);
+  if (mojo_filter->has_subclass_code)
+    filter.SetInterfaceSubclass(mojo_filter->subclass_code);
+  if (mojo_filter->has_protocol_code)
+    filter.SetInterfaceProtocol(mojo_filter->protocol_code);
+  return filter;
+}
+
+// static
+device::usb::TransferDirection
+TypeConverter<device::usb::TransferDirection, device::UsbEndpointDirection>::
+    Convert(const device::UsbEndpointDirection& direction) {
+  if (direction == device::USB_DIRECTION_INBOUND)
+    return device::usb::TRANSFER_DIRECTION_IN;
+  DCHECK(direction == device::USB_DIRECTION_OUTBOUND);
+  return device::usb::TRANSFER_DIRECTION_OUT;
+}
+
+// static
+device::usb::EndpointType
+TypeConverter<device::usb::EndpointType, device::UsbTransferType>::Convert(
+    const device::UsbTransferType& type) {
+  switch (type) {
+    case device::USB_TRANSFER_ISOCHRONOUS:
+      return device::usb::ENDPOINT_TYPE_ISOCHRONOUS;
+    case device::USB_TRANSFER_BULK:
+      return device::usb::ENDPOINT_TYPE_BULK;
+    case device::USB_TRANSFER_INTERRUPT:
+      return device::usb::ENDPOINT_TYPE_INTERRUPT;
+    // Note that we do not expose control transfer in the public interface
+    // because control endpoints are implied rather than explicitly enumerated
+    // there.
+    default:
+      NOTREACHED();
+      return device::usb::ENDPOINT_TYPE_BULK;
+  }
+}
+
+// static
+device::usb::EndpointInfoPtr
+TypeConverter<device::usb::EndpointInfoPtr, device::UsbEndpointDescriptor>::
+    Convert(const device::UsbEndpointDescriptor& endpoint) {
+  device::usb::EndpointInfoPtr info = device::usb::EndpointInfo::New();
+  info->endpoint_number = endpoint.address;
+  info->direction =
+      ConvertTo<device::usb::TransferDirection>(endpoint.direction);
+  info->type = ConvertTo<device::usb::EndpointType>(endpoint.transfer_type);
+  info->packet_size = static_cast<uint32_t>(endpoint.maximum_packet_size);
+  return info.Pass();
+}
+
+// static
+device::usb::AlternateInterfaceInfoPtr
+TypeConverter<device::usb::AlternateInterfaceInfoPtr,
+              device::UsbInterfaceDescriptor>::
+    Convert(const device::UsbInterfaceDescriptor& interface) {
+  device::usb::AlternateInterfaceInfoPtr info =
+      device::usb::AlternateInterfaceInfo::New();
+  info->alternate_setting = interface.alternate_setting;
+  info->class_code = interface.interface_class;
+  info->subclass_code = interface.interface_subclass;
+  info->protocol_code = interface.interface_protocol;
+
+  // Filter out control endpoints for the public interface.
+  info->endpoints = mojo::Array<device::usb::EndpointInfoPtr>::New(0);
+  for (const auto& endpoint : interface.endpoints) {
+    if (endpoint.transfer_type != device::USB_TRANSFER_CONTROL)
+      info->endpoints.push_back(device::usb::EndpointInfo::From(endpoint));
+  }
+
+  return info.Pass();
+}
+
+// static
+mojo::Array<device::usb::InterfaceInfoPtr>
+TypeConverter<mojo::Array<device::usb::InterfaceInfoPtr>,
+              std::vector<device::UsbInterfaceDescriptor>>::
+    Convert(const std::vector<device::UsbInterfaceDescriptor>& interfaces) {
+  auto infos = mojo::Array<device::usb::InterfaceInfoPtr>::New(0);
+
+  // Aggregate each alternate setting into an InterfaceInfo corresponding to its
+  // interface number.
+  std::map<uint8_t, device::usb::InterfaceInfo*> interface_map;
+  for (size_t i = 0; i < interfaces.size(); ++i) {
+    auto alternate = device::usb::AlternateInterfaceInfo::From(interfaces[i]);
+    auto iter = interface_map.find(interfaces[i].interface_number);
+    if (iter == interface_map.end()) {
+      // This is the first time we're seeing an alternate with this interface
+      // number, so add a new InterfaceInfo to the array and map the number.
+      auto info = device::usb::InterfaceInfo::New();
+      iter = interface_map.insert(std::make_pair(interfaces[i].interface_number,
+                                                 info.get())).first;
+      infos.push_back(info.Pass());
+    }
+    iter->second->alternates.push_back(alternate.Pass());
+  }
+
+  return infos.Pass();
+}
+
+// static
+device::usb::ConfigurationInfoPtr
+TypeConverter<device::usb::ConfigurationInfoPtr, device::UsbConfigDescriptor>::
+    Convert(const device::UsbConfigDescriptor& config) {
+  device::usb::ConfigurationInfoPtr info =
+      device::usb::ConfigurationInfo::New();
+  info->configuration_value = config.configuration_value;
+  info->interfaces =
+      mojo::Array<device::usb::InterfaceInfoPtr>::From(config.interfaces);
+  return info.Pass();
+}
+
+// static
+device::usb::DeviceInfoPtr
+TypeConverter<device::usb::DeviceInfoPtr, device::UsbDevice>::Convert(
+    const device::UsbDevice& device) {
+  device::usb::DeviceInfoPtr info = device::usb::DeviceInfo::New();
+  info->vendor_id = device.vendor_id();
+  info->product_id = device.product_id();
+  info->manufacturer = base::UTF16ToUTF8(device.manufacturer_string());
+  info->product = base::UTF16ToUTF8(device.product_string());
+  info->serial_number = base::UTF16ToUTF8(device.serial_number());
+  return info.Pass();
+}
+
+}  // namespace mojo