| /* |
| * Copyright (C) 2018 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 com.android.server.backup.encryption.chunking; |
| |
| import java.io.IOException; |
| |
| /** Writes backup data either as a diff script or as raw data, determined by the implementation. */ |
| public interface BackupWriter { |
| /** Writes the given bytes to the output. */ |
| void writeBytes(byte[] bytes) throws IOException; |
| |
| /** |
| * Writes an existing chunk from the previous backup to the output. |
| * |
| * <p>Note: not all implementations support this method. |
| */ |
| void writeChunk(long start, int length) throws IOException; |
| |
| /** Returns the number of bytes written, included bytes copied from the old file. */ |
| long getBytesWritten(); |
| |
| /** |
| * Indicates that no more bytes or chunks will be written. |
| * |
| * <p>After calling this, you may not call {@link #writeBytes(byte[])} or {@link |
| * #writeChunk(long, int)} |
| */ |
| void flush() throws IOException; |
| } |