/*

 * Copyright (c) 1996, 2005, 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.

 */

import java.nio.CharBuffer;

import java.nio.ByteBuffer;

import java.nio.charset.*;

import sun.nio.cs.*;

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

public class X11KSC5601 extends Charset {

    public X11KSC5601 () {

        super("X11KSC5601", null);

    }

    public CharsetEncoder newEncoder() {

        return new Encoder(this);

    }

    public CharsetDecoder newDecoder() {

        return new Decoder(this);

    }

    public boolean contains(Charset cs) {

        return cs instanceof X11KSC5601;

    }

    private class Encoder extends CharsetEncoder {

        private DoubleByte.Encoder enc = (DoubleByte.Encoder)new EUC_KR().newEncoder();

        public Encoder(Charset cs) {

            super(cs, 2.0f, 2.0f);

        }

        public boolean canEncode(char c) {

            if (c <= 0x7F) {

                return false;

            }

            return enc.canEncode(c);

        }

        protected int encodeDouble(char c) {

            return enc.encodeChar(c);

        }

        protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) {

            char[] sa = src.array();

            int sp = src.arrayOffset() + src.position();

            int sl = src.arrayOffset() + src.limit();

            byte[] da = dst.array();

            int dp = dst.arrayOffset() + dst.position();

            int dl = dst.arrayOffset() + dst.limit();

            try {

                while (sp < sl) {

                    char c = sa[sp];

                    if (c <= '\u007f')

                        return CoderResult.unmappableForLength(1);

                    int ncode = encodeDouble(c);

                    if (ncode != 0 && c != '\u0000' ) {

                        da[dp++] = (byte) ((ncode  >> 8) & 0x7f);

                        da[dp++] = (byte) (ncode & 0x7f);

                        sp++;

                        continue;

                    }

                    return CoderResult.unmappableForLength(1);

                }

                return CoderResult.UNDERFLOW;

            } finally {

                src.position(sp - src.arrayOffset());

                dst.position(dp - dst.arrayOffset());

            }

        }

        public boolean isLegalReplacement(byte[] repl) {

            return true;

        }

    }

    private class Decoder extends  CharsetDecoder {

        private DoubleByte.Decoder dec = (DoubleByte.Decoder)new EUC_KR().newDecoder();

        public Decoder(Charset cs) {

            super(cs, 0.5f, 1.0f);

        }

        protected char decodeDouble(int b1, int b2) {

            return dec.decodeDouble(b1, b2);

        }

        protected CoderResult decodeLoop(ByteBuffer src, CharBuffer dst) {

            byte[] sa = src.array();

            int sp = src.arrayOffset() + src.position();

            int sl = src.arrayOffset() + src.limit();

            assert (sp <= sl);

            sp = (sp <= sl ? sp : sl);

            char[] da = dst.array();

            int dp = dst.arrayOffset() + dst.position();

            int dl = dst.arrayOffset() + dst.limit();

            assert (dp <= dl);

            dp = (dp <= dl ? dp : dl);

            try {

                while (sp < sl) {

                    if ( sl - sp < 2) {

                        return CoderResult.UNDERFLOW;

                    }

                    int b1 = sa[sp] & 0xFF | 0x80;

                    int b2 = sa[sp + 1] & 0xFF | 0x80;

                    char c = decodeDouble(b1, b2);

                    if (c == UNMAPPABLE_DECODING) {

                        return CoderResult.unmappableForLength(2);

                    }

                    if (dl - dp < 1)

                        return CoderResult.OVERFLOW;

                    da[dp++] = c;

                    sp +=2;

                }

                return CoderResult.UNDERFLOW;

            } finally {

                src.position(sp - src.arrayOffset());

                dst.position(dp - dst.arrayOffset());

            }

        }

    }

}