/*

 * Copyright (c) 2010, 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

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 */

/* @test

 * @bug 4712786

 * @summary Check charsets against reference files

 *

 * @build Util

 * @run main Check shift_jis ref.shift_jis

 * @run main/othervm -Dsun.nio.cs.map=Windows-31J/Shift_JIS Check shift_jis ref.windows-31j

 */

import java.io.*;

import java.nio.*;

import java.nio.channels.*;

import java.nio.charset.*;

import java.util.*;

import java.util.regex.*;

public class Check {

    private static PrintStream log = System.err;

    private static final int UNICODE_SIZE = (1 << 16);

    private final String csName;

    private final String refName;

    private byte[][] bytes = new byte[UNICODE_SIZE][]; // Indexed by char

    private int errors = 0;

    private Check(String csn, String refn) {

        csName = csn;

        refName = refn;

    }

    private Check load()

        throws IOException

    {

        File fn = new File(System.getProperty("test.src", "."), refName);

        FileChannel fc = new FileInputStream(fn).getChannel();

        ByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());

        CharBuffer cb = Charset.forName("US-ASCII").decode(bb);

        Pattern p = Pattern.compile("^(\\p{XDigit}+) +(\\p{XDigit}+)$",

                                    Pattern.MULTILINE);

        Matcher m = p.matcher(cb);

        while (m.find()) {

            char c = (char)Integer.parseInt(m.group(1), 16);

            String v = m.group(2);

            int nb = v.length() >> 1;

            byte[] ba = new byte[nb];

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

                ba[i] = (byte)Integer.parseInt(v.substring(i << 1, (i << 1) + 2),

                                               16);

            }

            bytes[c] = ba;

        }

        return this;

    }

    private void error() {

        if (++errors >= 100)

            throw new RuntimeException("100 errors occurred (there might be more)");

    }

    private void mismatch(String s, byte[] expected, byte[] got) {

        log.println("Encoding mismatch on \""

                    + Util.toString(s)

                    + "\": Expected {"

                    + Util.toString(expected)

                    + "}, got {"

                    + Util.toString(got)

                    + "}");

        error();

    }

    private void mismatch(int i, byte[] ba, String expected, String got) {

        log.println("Decoding mismatch on \""

                    + Util.toString((char)i)

                    + "\", input {"

                    + Util.toString(ba)

                    + "}: Expected \""

                    + Util.toString(expected)

                    + "\", got \""

                    + Util.toString(got)

                    + "\"");

        error();

    }

    private void check()

        throws IOException

    {

        // String.getBytes(String csn)

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

            if (bytes[i] == null)

                continue;

            String s = new String(new char[]{ (char)i });

            byte[] ba = s.getBytes(csName);

            if (Util.cmp(ba, bytes[i]) >= 0)

                mismatch(s, bytes[i], ba);

        }

        log.println("String.getBytes(\"" + csName + "\") okay");

        // String(byte[] ba, String csn)

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

            if (bytes[i] == null)

                continue;

            String r = new String(new char[]{ (char)i });

            String s = new String(bytes[i], csName);

            if (!r.equals(s))

                mismatch(i, bytes[i], r, s);

        }

        log.println("String(byte[] ba, \"" + csName + "\") okay");

        // To be really thorough we should test OutputStreamWriter,

        // InputStreamReader, and Charset{De,En}Coder here also,

        // but the above will do for now.

        if (errors > 0) {

            throw new RuntimeException(errors + " error(s) occurred");

        }

    }

    // Usage: Check charsetName referenceFileName

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

        new Check(args[0], args[1]).load().check();

    }

}