/*

 * Copyright (c) 2011, 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 7040220

   @summary Test if StringCoding and NIO result have the same de/encoding result for UTF-8

 * @run main/othervm/timeout=2000 TestStringCodingUTF8

 */

import java.util.*;

import java.nio.*;

import java.nio.charset.*;

public class TestStringCodingUTF8 {

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

        test("UTF-8");

        test("CESU-8");

        // security manager on

        System.setSecurityManager(new PermissiveSecurityManger());

        test("UTF-8");

        test("CESU-8");

    }

    static void test(String csn) throws Throwable {

        Charset cs = Charset.forName(csn);

        char[] bmp = new char[0x10000];

        for (int i = 0; i < 0x10000; i++) {

            bmp[i] = (char)i;

        }

        test(cs, bmp, 0, bmp.length);

        ArrayList<Integer> list = new ArrayList<>(0x20000);

        for (int i = 0; i < 0x20000; i++) {

            list.add(i, i);

        }

        Collections.shuffle(list);

        int j = 0;

        char[] bmpsupp = new char[0x30000];

        for (int i = 0; i < 0x20000; i++) {

            j += Character.toChars(list.get(i), bmpsupp, j);

        }

        assert (j == bmpsupp.length);

        test(cs, bmpsupp, 0, bmpsupp.length);

        // randomed "off" and "len" on shuffled data

        Random rnd = new Random();

        int maxlen = 1000;

        int itr = 5000;

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

            int off = rnd.nextInt(bmpsupp.length - maxlen);

            int len = rnd.nextInt(maxlen);

            test(cs, bmpsupp, off, len);

        }

        // random length of bytes, test the edge corner case

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

            byte[] ba = new byte[rnd.nextInt(maxlen)];

            rnd.nextBytes(ba);

            //new String(csn);

            if (!new String(ba, cs.name()).equals(

                 new String(decode(cs, ba, 0, ba.length))))

                throw new RuntimeException("new String(csn) failed");

            //new String(cs);

            if (!new String(ba, cs).equals(

                 new String(decode(cs, ba, 0, ba.length))))

                throw new RuntimeException("new String(cs) failed");

        }

        System.out.println("done!");

    }

    static void test(Charset cs, char[] ca, int off, int len) throws Throwable {

        String str = new String(ca, off, len);

        byte[] ba = encode(cs, ca, off, len);

        //getBytes(csn);

        byte[] baStr = str.getBytes(cs.name());

        if (!Arrays.equals(ba, baStr))

            throw new RuntimeException("getBytes(csn) failed");

        //getBytes(cs);

        baStr = str.getBytes(cs);

        if (!Arrays.equals(ba, baStr))

            throw new RuntimeException("getBytes(cs) failed");

        //new String(csn);

        if (!new String(ba, cs.name()).equals(new String(decode(cs, ba, 0, ba.length))))

            throw new RuntimeException("new String(csn) failed");

        //new String(cs);

        if (!new String(ba, cs).equals(new String(decode(cs, ba, 0, ba.length))))

            throw new RuntimeException("new String(cs) failed");

    }

    // copy/paste of the StringCoding.decode()

    static char[] decode(Charset cs, byte[] ba, int off, int len) {

        CharsetDecoder cd = cs.newDecoder();

        int en = (int)(len * cd.maxCharsPerByte());

        char[] ca = new char[en];

        if (len == 0)

            return ca;

        cd.onMalformedInput(CodingErrorAction.REPLACE)

          .onUnmappableCharacter(CodingErrorAction.REPLACE)

          .reset();

        ByteBuffer bb = ByteBuffer.wrap(ba, off, len);

        CharBuffer cb = CharBuffer.wrap(ca);

        try {

            CoderResult cr = cd.decode(bb, cb, true);

            if (!cr.isUnderflow())

                cr.throwException();

            cr = cd.flush(cb);

            if (!cr.isUnderflow())

                cr.throwException();

        } catch (CharacterCodingException x) {

            throw new Error(x);

        }

        return Arrays.copyOf(ca, cb.position());

    }

    // copy/paste of the StringCoding.encode()

    static byte[] encode(Charset cs, char[] ca, int off, int len) {

        CharsetEncoder ce = cs.newEncoder();

        int en = (int)(len * ce.maxBytesPerChar());

        byte[] ba = new byte[en];

        if (len == 0)

            return ba;

        ce.onMalformedInput(CodingErrorAction.REPLACE)

          .onUnmappableCharacter(CodingErrorAction.REPLACE)

          .reset();

        ByteBuffer bb = ByteBuffer.wrap(ba);

        CharBuffer cb = CharBuffer.wrap(ca, off, len);

        try {

            CoderResult cr = ce.encode(cb, bb, true);

            if (!cr.isUnderflow())

                cr.throwException();

            cr = ce.flush(bb);

            if (!cr.isUnderflow())

                cr.throwException();

        } catch (CharacterCodingException x) {

            throw new Error(x);

        }

        return Arrays.copyOf(ba, bb.position());

    }

    static class PermissiveSecurityManger extends SecurityManager {

        @Override public void checkPermission(java.security.Permission p) {}

    }

}