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 com.android.server.backup.encryption.chunk.ChunkOrderingType;
  import java.io.IOException;
  
  /** Encodes an {@link EncryptedChunk} as bytes to write to the encrypted backup file. */
  public interface EncryptedChunkEncoder {
      /**
       * Encodes the given chunk and asks the writer to write it.
       *
       * <p>The chunk will be encoded in the format [nonce]+[encrypted data].
       *
       * <p>TODO(b/116575321): Choose a more descriptive method name after the code move is done.
       */
      void writeChunkToWriter(BackupWriter writer, EncryptedChunk chunk) throws IOException;
  
      /**
       * Returns the length in bytes that this chunk would be if encoded with {@link
       * #writeChunkToWriter}.
       */
      int getEncodedLengthOfChunk(EncryptedChunk chunk);
  
      /**
       * Returns the {@link ChunkOrderingType} that must be included in the backup file, when using
       * this decoder, so that the file may be correctly decoded.
       */
      @ChunkOrderingType
      int getChunkOrderingType();
  }
  