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 * Copyright (c) 2002, 2021, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package sun.nio.cs;

import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
import sun.nio.cs.DoubleByte;
import sun.nio.cs.HKSCS;
import sun.nio.cs.HistoricallyNamedCharset;
import static sun.nio.cs.CharsetMapping.*;

public class MS950_HKSCS_XP extends Charset
{
    public MS950_HKSCS_XP() {
        super("x-MS950-HKSCS-XP", StandardCharsets.aliases_MS950_HKSCS_XP());
    }

    public boolean contains(Charset cs) {
        return ((cs.name().equals("US-ASCII"))
                || (cs instanceof MS950)
                || (cs instanceof MS950_HKSCS_XP));
    }

    public CharsetDecoder newDecoder() {
        return new Decoder(this);
    }

    public CharsetEncoder newEncoder() {
        return new Encoder(this);
    }

    static class Decoder extends HKSCS.Decoder {
        private static DoubleByte.Decoder ms950 =
            (DoubleByte.Decoder)new MS950().newDecoder();

        /*
         * Note current decoder decodes 0x8BC2 --> U+F53A
         * ie. maps to Unicode PUA.
         * Unaccounted discrepancy between this mapping
         * inferred from MS950/windows-950 and the published
         * MS HKSCS mappings which maps 0x8BC2 --> U+5C22
         * a character defined with the Unified CJK block
         */
        private static final char[][] b2cBmp = new char[0x100][];
        static {
            initb2c(b2cBmp, HKSCS_XPMapping.b2cBmpStr);
        }

        public char decodeDoubleEx(int b1, int b2) {
            return UNMAPPABLE_DECODING;
        }

        private Decoder(Charset cs) {
            super(cs, ms950, b2cBmp, null);
        }
    }

    private static class Encoder extends HKSCS.Encoder {
        private static DoubleByte.Encoder ms950 =
            (DoubleByte.Encoder)new MS950().newEncoder();

        /*
         * Note current encoder encodes U+F53A --> 0x8BC2
         * Published MS HKSCS mappings show
         * U+5C22 <--> 0x8BC2
         */
        static final char[][] c2bBmp = new char[0x100][];
        static {
            initc2b(c2bBmp, HKSCS_XPMapping.b2cBmpStr, null);
        }

        public int encodeSupp(int cp) {
            return UNMAPPABLE_ENCODING;
        }

        private Encoder(Charset cs) {
            super(cs, ms950, c2bBmp, null);
        }
    }
}
