| /* |
| * 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(); |
| } |