/*

 * Copyright (c) 2006, 2012, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.

 */

/*

 */

package sun.nio.cs.ext;

import java.nio.ByteBuffer;

import java.nio.charset.Charset;

import java.nio.charset.CharsetDecoder;

import java.nio.charset.CharsetEncoder;

import java.nio.charset.CoderResult;

import static sun.nio.cs.CharsetMapping.*;

// EBCDIC DBCS-only Korean

public class IBM834 extends Charset

{

    public IBM834() {

        super("x-IBM834", ExtendedCharsets.aliasesFor("x-IBM834"));

    }

    public boolean contains(Charset cs) {

        return (cs instanceof IBM834);

    }

    public CharsetDecoder newDecoder() {

        IBM933.initb2c();

        return new DoubleByte.Decoder_DBCSONLY(

            this, IBM933.b2c, null, 0x40, 0xfe);  // hardcode the b2min/max

    }

    public CharsetEncoder newEncoder() {

        IBM933.initc2b();

        return new Encoder(this);

    }

    protected static class Encoder extends DoubleByte.Encoder_DBCSONLY {

        public Encoder(Charset cs) {

            super(cs, new byte[] {(byte)0xfe, (byte)0xfe},

                  IBM933.c2b, IBM933.c2bIndex);

        }

        public int encodeChar(char ch) {

            int bb = super.encodeChar(ch);

            if (bb == UNMAPPABLE_ENCODING) {

                // Cp834 has 6 additional non-roundtrip char->bytes

                // mappings, see#6379808

                if (ch == '\u00b7') {

                    return 0x4143;

                } else if (ch == '\u00ad') {

                    return 0x4148;

                } else if (ch == '\u2015') {

                    return 0x4149;

                } else if (ch == '\u223c') {

                    return 0x42a1;

                } else if (ch == '\uff5e') {

                    return 0x4954;

                } else if (ch == '\u2299') {

                    return 0x496f;

                }

            }

            return bb;

        }

        public boolean isLegalReplacement(byte[] repl) {

            if (repl.length == 2 &&

                repl[0] == (byte)0xfe && repl[1] == (byte)0xfe)

                return true;

            return super.isLegalReplacement(repl);

        }

    }

}