/*
 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package jdk.internal.io;

import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Arrays;

/**
 * Utility methods data input and output.
 */
public class IOSupport {
    // buffer size used for reading and writing
    private static final int DEFAULT_BUFFER_SIZE = 8192;

    /**
     * Reads all bytes from an input stream and writes them to an output stream.
     */
    public static long copy(InputStream source, OutputStream sink)
        throws IOException
    {
        return copy(source, sink, DEFAULT_BUFFER_SIZE);
    }

    public static long copy(InputStream source, OutputStream sink,
        int bufferSize) throws IOException
    {
        long nread = 0L;
        byte[] buf = new byte[bufferSize];
        int n;
        while ((n = source.read(buf)) >= 0) {
            sink.write(buf, 0, n);
            nread += n;
        }
        return nread;
    }
}