arc: bluetooth: Add SDP host side support

components/arc/bluetooth/bluetooth_struct_traits.cc

+// Copyright 2016 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 "components/arc/bluetooth/bluetooth_struct_traits.h"
+
+#include <memory>
+#include <utility>
+
+namespace mojo {
+
+//  static
+arc::mojom::BluetoothSdpAttrType
+EnumTraits<arc::mojom::BluetoothSdpAttrType,
+           bluez::BluetoothServiceAttributeValueBlueZ::Type>::
+    ToMojom(bluez::BluetoothServiceAttributeValueBlueZ::Type input) {
+  switch (input) {
+    case bluez::BluetoothServiceAttributeValueBlueZ::NULLTYPE:
+    case bluez::BluetoothServiceAttributeValueBlueZ::UINT:
+    case bluez::BluetoothServiceAttributeValueBlueZ::INT:
+    case bluez::BluetoothServiceAttributeValueBlueZ::UUID:
+    case bluez::BluetoothServiceAttributeValueBlueZ::STRING:
+    case bluez::BluetoothServiceAttributeValueBlueZ::BOOL:
+    case bluez::BluetoothServiceAttributeValueBlueZ::SEQUENCE:
+    case bluez::BluetoothServiceAttributeValueBlueZ::URL:
+      return static_cast<arc::mojom::BluetoothSdpAttrType>(input);
+    default:
+      NOTREACHED() << "Invalid type: " << static_cast<uint32_t>(input);
+      return arc::mojom::BluetoothSdpAttrType::NULLTYPE;
+  }
+}
+
+// static
+bool EnumTraits<arc::mojom::BluetoothSdpAttrType,
+                bluez::BluetoothServiceAttributeValueBlueZ::Type>::
+    FromMojom(arc::mojom::BluetoothSdpAttrType input,
+              bluez::BluetoothServiceAttributeValueBlueZ::Type* output) {
+  switch (input) {
+    case arc::mojom::BluetoothSdpAttrType::NULLTYPE:
+    case arc::mojom::BluetoothSdpAttrType::UINT:
+    case arc::mojom::BluetoothSdpAttrType::INT:
+    case arc::mojom::BluetoothSdpAttrType::UUID:
+    case arc::mojom::BluetoothSdpAttrType::STRING:
+    case arc::mojom::BluetoothSdpAttrType::BOOL:
+    case arc::mojom::BluetoothSdpAttrType::SEQUENCE:
+    case arc::mojom::BluetoothSdpAttrType::URL:
+      *output =
+          static_cast<bluez::BluetoothServiceAttributeValueBlueZ::Type>(input);
+      return true;
+    default:
+      NOTREACHED() << "Invalid type: " << static_cast<uint32_t>(input);
+      return false;
+  }
+}
+
+// static
+bool StructTraits<arc::mojom::BluetoothSdpServiceAttr,
+                  bluez::BluetoothServiceAttributeValueBlueZ>::
+    Read(arc::mojom::BluetoothSdpServiceAttrDataView data,
+         bluez::BluetoothServiceAttributeValueBlueZ* output) {
+  bluez::BluetoothServiceAttributeValueBlueZ::Type type;
+  if (!data.ReadType(&type))
+    return false;
+
+  switch (type) {
+    case bluez::BluetoothServiceAttributeValueBlueZ::NULLTYPE:
+    case bluez::BluetoothServiceAttributeValueBlueZ::UINT:
+    case bluez::BluetoothServiceAttributeValueBlueZ::INT:
+    case bluez::BluetoothServiceAttributeValueBlueZ::UUID:
+    case bluez::BluetoothServiceAttributeValueBlueZ::STRING:
+    case bluez::BluetoothServiceAttributeValueBlueZ::URL:
+    case bluez::BluetoothServiceAttributeValueBlueZ::BOOL: {
+      base::ListValue list_value;
+      if (!data.ReadValue(&list_value) || list_value.GetSize() != 1)
+        return false;
+
+      size_t size = static_cast<size_t>(data.type_size());
+      base::Value* value = nullptr;
+      list_value.Get(0, &value);
+
+      *output = bluez::BluetoothServiceAttributeValueBlueZ(
+          type, size, value->CreateDeepCopy());
+      break;
+    }
+    case bluez::BluetoothServiceAttributeValueBlueZ::SEQUENCE: {
+      std::unique_ptr<bluez::BluetoothServiceAttributeValueBlueZ::Sequence>
+          sequence(new bluez::BluetoothServiceAttributeValueBlueZ::Sequence());
+      if (!data.ReadSequence(sequence.get()) || sequence->empty())
+        return false;
+      *output = bluez::BluetoothServiceAttributeValueBlueZ(std::move(sequence));

[puthik_chromium, 2016/08/24 00:32:20]

When I test this. Chrome crash at this line.

[Miao, 2016/08/25 16:51:36]

I think that is by null field. It should be revolved by marking value and
sequence nullable.

+      break;
+    }
+    default:
+      return false;
+  }
+  return true;
+}
+
+// static
+bool StructTraits<arc::mojom::BluetoothSdpRecord,
+                  bluez::BluetoothServiceRecordBlueZ>::
+    Read(arc::mojom::BluetoothSdpRecordDataView data,
+         bluez::BluetoothServiceRecordBlueZ* output) {
+  std::map<uint16_t, bluez::BluetoothServiceAttributeValueBlueZ> attributes;

[yzshen1, 2016/08/22 23:42:14]

Performance tip: because |attributes| is not directly used, you could instead
peek into the undeserialized data and add the elements into |output|.

mojo::MapDataView<uint16_t, arc::mojom::BluetoothSdpServiceAttrDataView>
map_data_view;
data.GetAttrsDataView(&map_data_view);

for (size_t i = 0; i < map_data_view.size(); ++i) {
   bluez::BluetoothServiceAttributeValueBlueZ value;
   if (!map_data_view.values().Read(i, &value))
     return false;
   output->AddRecordEntry(map_data_view.keys()[i], value);  // Or
std::move(value) if |value| supports move.
}

A simpler alternative is to change bluez::BluetoothServiceRecordBlueZ and add a
method to accept a std::map as input.

[Miao, 2016/08/25 16:51:36]

Adding a setting function is not a preferable way, since
bluez::BluetoothServiceRecordBlueZ is reflecting the service record stored in
underlying Bluetooth database where the attributes in a record do not change in
a batch manner. So I will use DataView instead.:) 

+  if (!data.ReadAttrs(&attributes) || attributes.empty())
+    return false;
+
+  for (auto& it : attributes)
+    output->AddRecordEntry(it.first, it.second);
+
+  return true;
+}
+
+}  // namespace mojo