Add Java API for libvintf.

android.os.VintfObject has two methods:

- report: return device info that can be reported to OTA server
- verify: verify that metadata for a given OTA package is
          compatible.

Test: pass
Test: adb shell am instrument -w -e class android.os.VintfObjectTest \
com.android.frameworks.coretests/android.support.test.runner.AndroidJUnitRunner

Bug: 36814503

Change-Id: Iff8fae289eec8ae9cfc327d0d0d36a1cdd5e6800

1 files changed, 64 insertions, 0 deletions

diff --git a/core/java/android/os/VintfObject.java b/core/java/android/os/VintfObject.java
new file mode 100644
index 000000000000..1ef3916a743f
--- /dev/null
+++ b/core/java/android/os/VintfObject.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2017 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.
+ */
+
+package android.os;
+
+import java.util.ArrayList;
+
+import android.util.Log;
+
+/** @hide */
+public class VintfObject {
+
+    private static final String LOG_TAG = "VintfObject";
+
+    /**
+     * Slurps all device information (both manifests)
+     * and report it.
+     * If any error in getting one of the manifests, it is not included in
+     * the list.
+     */
+    public static String[] report() {
+        ArrayList<String> ret = new ArrayList<>();
+        put(ret, getDeviceManifest(), "device manifest");
+        put(ret, getFrameworkManifest(), "framework manifest");
+        return ret.toArray(new String[0]);
+    }
+
+    /**
+     * Verify that the given metadata for an OTA package is compatible with
+     * this device.
+     *
+     * @param packageInfo a list of serialized form of HalMaanifest's /
+     * CompatibilityMatri'ces (XML).
+     * @return = 0 if success (compatible)
+     *         > 0 if incompatible
+     *         < 0 if any error (mount partition fails, illformed XML, etc.)
+     */
+    public static native int verify(String[] packageInfo);
+
+    // return null if any error, otherwise XML string.
+    private static native String getDeviceManifest();
+    private static native String getFrameworkManifest();
+
+    private static void put(ArrayList<String> list, String content, String message) {
+        if (content == null || content.length() == 0) {
+            Log.e(LOG_TAG, "Cannot get;" + message + "; check native logs for details.");
+            return;
+        }
+        list.add(content);
+    }
+}