/*

 * Copyright (c) 1998, 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.

 *

 * 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

 * @bug 4127657

 * @summary Check for correct handling of parameters to

 *          XXXXReader.read(b, off, len).

 *

 */

import java.io.*;

public class ReadParams {

    static int values[] = {Integer.MIN_VALUE, -1, 0, 1, 4, 16, 31,

                           32, 33, Integer.MAX_VALUE};

    static char b[][] = {null, new char[32]};

    static void test(Reader rdr) throws Exception {

        int i = 0, j = 0, k = 0;

        boolean nullPtr = false, indexOutBnd = false;

        for (i = 0; i < b.length; i++) {

            for ( j = 0; j < values.length; j++) {

                for ( k = 0; k < values.length; k++) {

                    nullPtr = (b[i] == null);

                    int bufLen = nullPtr ? 0 : b[i].length;

                    indexOutBnd = ((values[j] + values[k]) < 0)

                        ||(values[j] < 0)

                        || (values[j] > bufLen)

                        || (values[k] < 0)

                        || ((values[j] + values[k]) > bufLen);

                    try {

                        rdr.read(b[i], values[j], values[k]);

                    } catch (NullPointerException e) {

                        if (!nullPtr) {

                            throw new Exception

                                ("should not throw NullPointerException" + i + " " +j + " " + k);

                        }

                        continue;

                    } catch (IndexOutOfBoundsException e) {

                        if (!indexOutBnd) {

                            throw new Exception

                                ("should not throw IndexOutOfBoundsException");

                        }

                        continue;

                    }

                    if (nullPtr || indexOutBnd) {

                        throw new Exception("Should have thrown an exception");

                    }

                }

            }

        }

    }

    public static void main(String args[]) throws Exception{

        StringReader sr = new StringReader(new String(new byte[512]));

        test(sr);

        test(new BufferedReader(sr));

        test(new CharArrayReader(new char[8]));

        InputStreamReader ir = new InputStreamReader

            (new ByteArrayInputStream(new byte[512]));

        test(ir);

        test(new PushbackReader(sr, 2));

        PipedWriter pw = new PipedWriter();

        PipedReader pir = new PipedReader(pw);

        pw.write(new char[512], 0, 512);

        test(pir);

    }

}