bluetooth: Find the device's Bluetooth address

Test: bluetooth_hidl_hal_test
Change-Id: I5353aaef3f8c5db75e424a8e1b242b08d5a96c6e
diff --git a/bluetooth/1.0/default/test/properties.cc b/bluetooth/1.0/default/test/properties.cc
new file mode 100644
index 0000000..ad5c194
--- /dev/null
+++ b/bluetooth/1.0/default/test/properties.cc
@@ -0,0 +1,79 @@
+//
+// Copyright 2016 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#define LOG_TAG "properties"
+
+#include <ctype.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <cutils/properties.h>
+#include <utils/Log.h>
+
+static const int MAX_PROPERTIES = 5;
+
+struct property {
+  char key[PROP_KEY_MAX + 2];
+  char value[PROP_VALUE_MAX + 2];
+};
+
+int num_properties = 0;
+struct property properties[MAX_PROPERTIES];
+
+// Find the correct entry.
+static int property_find(const char *key) {
+  for (int i = 0; i < num_properties; i++) {
+    if (strncmp(properties[i].key, key, PROP_KEY_MAX) == 0) {
+      return i;
+    }
+  }
+  return MAX_PROPERTIES;
+}
+
+int property_set(const char *key, const char *value) {
+  if (strnlen(value, PROP_VALUE_MAX) > PROP_VALUE_MAX) return -1;
+
+  // Check to see if the property exists.
+  int prop_index = property_find(key);
+
+  if (prop_index == MAX_PROPERTIES) {
+    if (num_properties >= MAX_PROPERTIES) return -1;
+    prop_index = num_properties;
+    num_properties += 1;
+  }
+
+  // This is test code.  Be nice and don't push the boundary cases!
+  strncpy(properties[prop_index].key, key, PROP_KEY_MAX + 1);
+  strncpy(properties[prop_index].value, value, PROP_VALUE_MAX + 1);
+  return 0;
+}
+
+int property_get(const char *key, char *value, const char *default_value) {
+  // This doesn't mock the behavior of default value
+  if (default_value != NULL) ALOGE("%s: default_value is ignored!", __func__);
+
+  // Check to see if the property exists.
+  int prop_index = property_find(key);
+
+  if (prop_index == MAX_PROPERTIES) return 0;
+
+  int len = strlen(properties[prop_index].value);
+  memcpy(value, properties[prop_index].value, len);
+  value[len] = '\0';
+  return len;
+}