Hook up the backup data writer, and add a utility to read the backup data files.
diff --git a/core/jni/android_backup_BackupDataOutput.cpp b/core/jni/android_backup_BackupDataOutput.cpp
new file mode 100644
index 0000000..8fce2a2
--- /dev/null
+++ b/core/jni/android_backup_BackupDataOutput.cpp
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2009 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 "FileBackupHelper_native"
+#include <utils/Log.h>
+
+#include "JNIHelp.h"
+#include <android_runtime/AndroidRuntime.h>
+
+#include <utils/backup_helpers.h>
+
+namespace android
+{
+
+static jfieldID s_descriptorField = 0;
+
+static int
+ctor_native(JNIEnv* env, jobject This, jobject fileDescriptor)
+{
+ int err;
+
+ int fd = env->GetIntField(fileDescriptor, s_descriptorField);
+ if (fd == -1) {
+ return NULL;
+ }
+
+ return (int)new BackupDataWriter(fd);
+}
+
+static void
+dtor_native(JNIEnv* env, jobject This, int fd)
+{
+ delete (BackupDataWriter*)fd;
+}
+
+static const JNINativeMethod g_methods[] = {
+ { "ctor", "(Ljava/io/FileDescriptor;)I", (void*)ctor_native },
+ { "dtor", "(I)V", (void*)dtor_native },
+};
+
+int register_android_backup_BackupDataOutput(JNIEnv* env)
+{
+ LOGD("register_android_backup_BackupDataOutput");
+
+ jclass clazz;
+
+ clazz = env->FindClass("java/io/FileDescriptor");
+ LOG_FATAL_IF(clazz == NULL, "Unable to find class java.io.FileDescriptor");
+ s_descriptorField = env->GetFieldID(clazz, "descriptor", "I");
+ LOG_FATAL_IF(s_descriptorField == NULL,
+ "Unable to find descriptor field in java.io.FileDescriptor");
+
+ return AndroidRuntime::registerNativeMethods(env, "android/backup/BackupDataOutput",
+ g_methods, NELEM(g_methods));
+}
+
+}