content: /*
   * 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;
  }
  