bluetooth: Implement TxPower and RSSI of BluetoothAdvertisementData

third_party/WebKit/Source/modules/bluetooth/BluetoothAdvertisingData.cpp

+// 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 "config.h"
+#include "modules/bluetooth/BluetoothAdvertisingData.h"
+
+namespace blink {
+
+namespace {
+const int kUnknownPower = INT8_MAX;
+const int kMinimumPower = INT8_MIN;
+} // namespace
+
+BluetoothAdvertisingData* BluetoothAdvertisingData::create(int txPower, int rssi)
+{
+    return new BluetoothAdvertisingData(txPower, rssi);
+}
+
+int8_t BluetoothAdvertisingData::txPower(bool& isNull)
+{
+    if (m_txPower == kUnknownPower) {
+        isNull = true;
+    }
+    return m_txPower;
+}
+
+int8_t BluetoothAdvertisingData::rssi(bool& isNull)
+{
+    if (m_rssi == kUnknownPower) {
+        isNull = true;
+    }
+    return m_rssi;
+}
+
+static int8_t GetValidatedPower(int power)
+{
+    return (power > kUnknownPower || power < kNegativeUnknownPower) ? kUnknownPower : power;
+}
+
+BluetoothAdvertisingData::BluetoothAdvertisingData(int txPower, int rssi)
+    : m_txPower(GetValidatedPower(txPower))
+    , m_rssi(GetValidatedPower(rssi))
+{
+}
+
+} // namespace blink