/*

 * Copyright 2006 Sun Microsystems, Inc.  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.  Sun designates this

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

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.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;

// 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() {

        return new Decoder(this);

    }

    public CharsetEncoder newEncoder() {

        return new Encoder(this);

    }

    protected static class Decoder extends DBCS_ONLY_IBM_EBCDIC_Decoder {

        public Decoder(Charset cs) {

            super(cs);

            super.mask1 = 0xFFF0;

            super.mask2 = 0x000F;

            super.shift = 4;

            super.index1 = IBM933.getDecoderIndex1();

            super.index2 = IBM933.getDecoderIndex2();

        }

    }

    protected static class Encoder extends IBM933.Encoder {

        public Encoder(Charset cs) {

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

        }

        protected CoderResult implFlush(ByteBuffer out) {

            implReset();

            return CoderResult.UNDERFLOW;

        }

        protected byte[] encodeHangul(char ch) {

            byte[] bytes = super.encodeHangul(ch);

            if (bytes.length == 0) {

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

                // mappings, see#6379808

                if (ch == '\u00b7') {

                    return new byte[] {(byte)0x41, (byte)0x43 };

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

                    return new byte[] {(byte)0x41, (byte)0x48 };

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

                    return new byte[] {(byte)0x41, (byte)0x49 };

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

                    return new byte[] {(byte)0x42, (byte)0xa1 };

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

                    return new byte[] {(byte)0x49, (byte)0x54 };

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

                    return new byte[] {(byte)0x49, (byte)0x6f };

                }

            } else if (bytes[0] == 0) {

                return EMPTYBA;

            }

            return bytes;

        }

        public boolean canEncode(char ch) {

            return encodeHangul(ch).length != 0;

        }

        public boolean isLegalReplacement(byte[] repl) {

            if (repl.length == 2 &&

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

                return true;

            return super.isLegalReplacement(repl);

        }

    }

}