/*

 * Copyright (c) 2014 Google Inc. 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.

 *

 * 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.

 */

/*

 * @test

 * @ignore This test has huge memory requirements

 * @run main/timeout=1800/othervm -Xmx8g MaxCapacity

 * @bug 8055949

 * @summary Check that we can write (almost) Integer.MAX_VALUE bytes

 *          to a ByteArrayOutputStream.

 * @author Martin Buchholz

 */

import java.io.ByteArrayOutputStream;

public class MaxCapacity {

    public static void main(String[] args) {

        long maxHeap = Runtime.getRuntime().maxMemory();

        if (maxHeap < 3L * Integer.MAX_VALUE) {

            System.out.printf("Skipping test; max memory %sM too small%n",

                              maxHeap/(1024*1024));

            return;

        }

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        for (long n = 0; ; n++) {

            try {

                baos.write((byte)'x');

            } catch (Throwable t) {

                // check data integrity while we're here

                byte[] bytes = baos.toByteArray();

                if (bytes.length != n)

                    throw new AssertionError("wrong length");

                if (bytes[0] != 'x' ||

                    bytes[bytes.length - 1] != 'x')

                    throw new AssertionError("wrong contents");

                long gap = Integer.MAX_VALUE - n;

                System.out.printf("gap=%dM %d%n", gap/(1024*1024), gap);

                if (gap > 1024)

                    throw t;

                // t.printStackTrace();

                break;

            }

        }

    }

}