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/*
* Copyright (C) 2019 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;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/** Utility methods for dealing with Streams */
public class StreamUtils {
private static final int MAX_COPY_BUFFER_SIZE = 1024; // 1k copy buffer size.
/**
* Close a Closeable and silently ignore any IOExceptions.
*
* @param closeable The closeable to close
*/
public static void closeQuietly(Closeable closeable) {
try {
closeable.close();
} catch (IOException ioe) {
// Silently ignore
}
}
/**
* Copy data from an InputStream to an OutputStream upto a given number of bytes.
*
* @param in The source InputStream
* @param out The destination OutputStream
* @param limit The maximum number of bytes to copy
* @throws IOException Thrown if there is a problem performing the copy.
*/
public static void copyStream(InputStream in, OutputStream out, int limit) throws IOException {
int bufferSize = Math.min(MAX_COPY_BUFFER_SIZE, limit);
byte[] buffer = new byte[bufferSize];
int copied = 0;
while (copied < limit) {
int maxReadSize = Math.min(bufferSize, limit - copied);
int read = in.read(buffer, 0, maxReadSize);
if (read < 0) {
return; // Reached the stream end before the limit
}
out.write(buffer, 0, read);
copied += read;
}
}
}
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