/*
 * Copyright (c) 2008, 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.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
import sun.nio.cs.StandardCharsets;
import sun.nio.cs.SingleByte;
import sun.nio.cs.HistoricallyNamedCharset;
import static sun.nio.cs.CharsetMapping.*;

public class IBM918 extends Charset implements HistoricallyNamedCharset
{
    public IBM918() {
        super("IBM918", ExtendedCharsets.aliasesFor("IBM918"));
    }

    public String historicalName() {
        return "Cp918";
    }

    public boolean contains(Charset cs) {
        return (cs instanceof IBM918);
    }

    public CharsetDecoder newDecoder() {
        return new SingleByte.Decoder(this, b2c);
    }

    public CharsetEncoder newEncoder() {
        return new SingleByte.Encoder(this, c2b, c2bIndex);
    }

    public String getDecoderSingleByteMappings() {
        return b2cTable;
    }

    public char[] getEncoderIndex2() {
        return c2b;
    }

    public char[] getEncoderIndex1() {
        return c2bIndex;
    }

    private final static String b2cTable = 
        "\uFEA7\u0061\u0062\u0063\u0064\u0065\u0066\u0067" +      // 0x80 - 0x87
        "\u0068\u0069\uFEA9\uFB88\uFEAB\uFEAD\uFB8C\uFEAF" +      // 0x88 - 0x8f
        "\uFB8A\u006A\u006B\u006C\u006D\u006E\u006F\u0070" +      // 0x90 - 0x97
        "\u0071\u0072\uFEB1\uFEB3\uFEB5\uFEB7\uFEB9\uFEBB" +      // 0x98 - 0x9f
        "\uFEBD\u007E\u0073\u0074\u0075\u0076\u0077\u0078" +      // 0xa0 - 0xa7
        "\u0079\u007A\uFEBF\uFEC3\uFEC7\uFEC9\uFECA\uFECB" +      // 0xa8 - 0xaf
        "\uFECC\uFECD\uFECE\uFECF\uFED0\uFED1\uFED3\uFED5" +      // 0xb0 - 0xb7
        "\uFED7\uFB8E\uFEDB\u007C\uFB92\uFB94\uFEDD\uFEDF" +      // 0xb8 - 0xbf
        "\u007B\u0041\u0042\u0043\u0044\u0045\u0046\u0047" +      // 0xc0 - 0xc7
        "\u0048\u0049\u00AD\uFEE0\uFEE1\uFEE3\uFB9E\uFEE5" +      // 0xc8 - 0xcf
        "\u007D\u004A\u004B\u004C\u004D\u004E\u004F\u0050" +      // 0xd0 - 0xd7
        "\u0051\u0052\uFEE7\uFE85\uFEED\uFBA6\uFBA8\uFBA9" +      // 0xd8 - 0xdf
        "\\\uFBAA\u0053\u0054\u0055\u0056\u0057\u0058" +      // 0xe0 - 0xe7
        "\u0059\u005A\uFE80\uFE89\uFE8A\uFE8B\uFBFC\uFBFD" +      // 0xe8 - 0xef
        "\u0030\u0031\u0032\u0033\u0034\u0035\u0036\u0037" +      // 0xf0 - 0xf7
        "\u0038\u0039\uFBFE\uFBB0\uFBAE\uFE7C\uFE7D\u009F" +      // 0xf8 - 0xff
        "\u0000\u0001\u0002\u0003\u009C\t\u0086\u007F" +      // 0x00 - 0x07
        "\u0097\u008D\u008E\u000B\f\r\u000E\u000F" +      // 0x08 - 0x0f
        "\u0010\u0011\u0012\u0013\u009D\n\b\u0087" +      // 0x10 - 0x17
        "\u0018\u0019\u0092\u008F\u001C\u001D\u001E\u001F" +      // 0x18 - 0x1f
        "\u0080\u0081\u0082\u0083\u0084\n\u0017\u001B" +      // 0x20 - 0x27
        "\u0088\u0089\u008A\u008B\u008C\u0005\u0006\u0007" +      // 0x28 - 0x2f
        "\u0090\u0091\u0016\u0093\u0094\u0095\u0096\u0004" +      // 0x30 - 0x37
        "\u0098\u0099\u009A\u009B\u0014\u0015\u009E\u001A" +      // 0x38 - 0x3f
        "\u0020\u00A0\u060C\u061B\u061F\uFE81\uFE8D\uFE8E" +      // 0x40 - 0x47
        "\uF8FB\uFE8F\u005B\u002E\u003C\u0028\u002B\u0021" +      // 0x48 - 0x4f
        "\u0026\uFE91\uFB56\uFB58\uFE93\uFE95\uFE97\uFB66" +      // 0x50 - 0x57
        "\uFB68\uFE99\u005D\u0024\u002A\u0029\u003B\u005E" +      // 0x58 - 0x5f
        "\u002D\u002F\uFE9B\uFE9D\uFE9F\uFB7A\uFB7C\uFEA1" +      // 0x60 - 0x67
        "\uFEA3\uFEA5\u0060\u002C\u0025\u005F\u003E\u003F" +      // 0x68 - 0x6f
        "\u06F0\u06F1\u06F2\u06F3\u06F4\u06F5\u06F6\u06F7" +      // 0x70 - 0x77
        "\u06F8\u06F9\u003A\u0023\u0040\'\u003D\"" ;      // 0x78 - 0x7f


    private final static char[] b2c = b2cTable.toCharArray();
    private final static char[] c2b = new char[0x500];
    private final static char[] c2bIndex = new char[0x100];

    static {
        char[] b2cMap = b2c;
        char[] c2bNR = null;
        // remove non-roundtrip entries
        b2cMap = b2cTable.toCharArray();
        b2cMap[165] = UNMAPPABLE_DECODING;

        // non-roundtrip c2b only entries
        c2bNR = new char[2];
        c2bNR[0] = 0x15; c2bNR[1] = 0x85;

        SingleByte.initC2B(b2cMap, c2bNR, c2b, c2bIndex);
    }
}
