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/*
* 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();
}
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