/*

 * Copyright (c) 2008, 2014, 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 5058133 6233345 6381699 6381702 6381705 6381706

 * @summary Check that all one-char sequences can be encoded by all charsets

 * @run main/timeout=1200 FindOneCharEncoderBugs

 * @author Martin Buchholz

 */

import java.util.*;

import java.nio.*;

import java.nio.charset.*;

public class FindOneCharEncoderBugs {

    final static String[] brokenCharsets = {

        // Delete the following lines when these charsets are fixed!

        "x-IBM970",

        "x-COMPOUND_TEXT", // Direct buffers not supported

    };

    private static boolean equals(byte[] ba, ByteBuffer bb) {

        if (ba.length != bb.limit())

            return false;

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

            if (ba[i] != bb.get(i))

                return false;

        return true;

    }

    private static String toString(byte[] bytes) {

        final StringBuilder sb = new StringBuilder();

        for (byte b : bytes) {

            if (sb.length() != 0) sb.append(' ');

            sb.append(String.format("%02x", (int)b));

        }

        return sb.toString();

    }

    private static String toString(ByteBuffer bb) {

        final StringBuilder sb = new StringBuilder();

        for (int i = 0; i < bb.limit(); i++) {

            if (sb.length() != 0) sb.append(' ');

            sb.append(String.format("%02x", (int)bb.get(i)));

        }

        return sb.toString();

    }

    private static ByteBuffer convert(Charset cs, char c, CharBuffer cb) throws Throwable {

        cb.clear(); cb.put(c); cb.flip();

        return cs.newEncoder()

            .onUnmappableCharacter(CodingErrorAction.REPLACE)

            .onMalformedInput(CodingErrorAction.REPLACE)

            .encode(cb);

    }

    /** Returns a direct CharBuffer with the same capacity as ordinary CharBuffer ocb */

    private static CharBuffer directCharBuffer(CharBuffer ocb) {

        final CharBuffer dcb =

            ByteBuffer.allocateDirect(ocb.capacity() * Character.SIZE / Byte.SIZE)

            .asCharBuffer();

        check(! ocb.isDirect());

        check(  dcb.isDirect());

        equal(ocb.capacity(), dcb.capacity());

        return dcb;

    }

    private static void testChar(byte[] expected, CharBuffer cb, Charset cs, char c) {

        try {

            final ByteBuffer bb = convert(cs, c, cb);

            if (! equals(expected, bb))

                fail("bytes differ charset=%s direct=%s char=\\u%04x%n%s%n%s",

                     cs, cb.isDirect(), (int)c,

                     toString(expected), toString(bb));

        } catch (Throwable t) {

            System.out.printf("Unexpected exception charset=%s direct=%s char=\\u%04x%n",

                              cs, cb.isDirect(), (int)c);

            unexpected(t);

            failed++;

        }

    }

    private static void testCharset(Charset cs) throws Throwable {

        if (! cs.canEncode())

            return;

        final String csn = cs.name();

        for (String n : brokenCharsets)

            if (csn.equals(n)) {

                System.out.printf("Skipping possibly broken charset %s%n", csn);

                return;

            }

        System.out.println(csn);

        final char[] theChar = new char[1];

        final CharBuffer ocb = CharBuffer.allocate(1);

        final CharBuffer dcb = directCharBuffer(ocb);

        final int maxFailuresPerCharset = 5;

        final int failed0 = failed;

        for (char c = '\u0000';

             (c+1 != 0x10000) && (failed - failed0 < maxFailuresPerCharset);

             c++) {

            theChar[0] = c;

            byte[] bytes = new String(theChar).getBytes(csn);

            if (bytes.length == 0)

                fail("Empty output?! charset=%s char=\\u%04x", cs, (int)c);

            testChar(bytes, ocb, cs, c);

            testChar(bytes, dcb, cs, c);

        }

    }

    private static void realMain(String[] args) {

        for (Charset cs : Charset.availableCharsets().values()) {

            try { testCharset(cs); }

            catch (Throwable t) { unexpected(t); }

        }

    }

    //--------------------- Infrastructure ---------------------------

    static volatile int passed = 0, failed = 0;

    static void pass() {passed++;}

    static void fail() {failed++; Thread.dumpStack();}

    static void fail(String format, Object... args) {

        System.out.println(String.format(format, args)); failed++;}

    static void fail(String msg) {System.out.println(msg); fail();}

    static void unexpected(Throwable t) {failed++; t.printStackTrace();}

    static void check(boolean cond) {if (cond) pass(); else fail();}

    static void equal(Object x, Object y) {

        if (x == null ? y == null : x.equals(y)) pass();

        else fail(x + " not equal to " + y);}

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

        try {realMain(args);} catch (Throwable t) {unexpected(t);}

        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);

        if (failed > 0) throw new AssertionError("Some tests failed");}

    private static abstract class CheckedThread extends Thread {

        abstract void realRun() throws Throwable;

        public void run() {

            try {realRun();} catch (Throwable t) {unexpected(t);}}}

}