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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 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;
}
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