/*

 * 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.

 *

 */

/* @test

 * @summary Check that array-crossing surrogate pairs are handled properly

 */

import java.io.*;

import java.nio.*;

import java.nio.charset.*;

public class Surrogates {

    static PrintStream log = System.err;

    static char[] input;

    static byte[] output;

    static final int LEN = 128;

    static void initData() throws IOException {

        StringBuffer sb = new StringBuffer();

        for (int i = 0; i < LEN; i++) {

            int c = Surrogate.UCS4_SURROGATE_MIN + 1;

            sb.append(Surrogate.high(c));

            sb.append(Surrogate.low(c));

        }

        input = sb.toString().toCharArray();

        ByteArrayOutputStream bos = new ByteArrayOutputStream();

        OutputStreamWriter osw

            = new OutputStreamWriter(bos, Charset.forName("UTF-8"));

        osw.write(input);

        osw.close();

        output = bos.toByteArray();

    }

    static void testLeftovers(boolean doMalformed)

        throws Exception

    {

        log.print("Leftover surrogates, doMalformed = " + doMalformed);

        ByteArrayOutputStream bos = new ByteArrayOutputStream();

        OutputStreamWriter osw

            = new OutputStreamWriter(bos, Charset.forName("UTF-8"));

        for (int i = 0; i < input.length; i += 7)

            osw.write(input, i, Math.min(input.length - i, 7));

        if (doMalformed)

            osw.write(input, 0, 1);

        osw.close();

        byte[] result = bos.toByteArray();

        // Ignore a trailing '?' if we wrote a malformed final surrogate

        int rl = result.length + (doMalformed ? -1 : 0);

        if (rl != output.length)

            throw new Exception("Incorrect result length "

                                + rl + ", expected " + output.length);

        for (int i = 0; i < output.length; i++)

            if (result[i] != output[i])

                throw new Exception("Unexpected result value at index " + i);

        log.println(": Passed");

    }

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

        initData();

        testLeftovers(false);

        testLeftovers(true);

    }

}