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/*
 * Copyright 2003-2004 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.
 */

/*
 * @(#)EUC_JP_Open.java  1.11 07/05/05
 */

package sun.nio.cs.ext;

import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;
import sun.nio.cs.HistoricallyNamedCharset;
import sun.nio.cs.Surrogate;

public class EUC_JP_Open
    extends Charset
    implements HistoricallyNamedCharset
{
    public EUC_JP_Open() {
  super("x-eucJP-Open", ExtendedCharsets.aliasesFor("x-eucJP-Open"));
    }

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

    public boolean contains(Charset cs) {
  return ((cs.name().equals("US-ASCII"))
    || (cs instanceof JIS_X_0201)
    || (cs instanceof EUC_JP));
    }

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

    public CharsetEncoder newEncoder() {

  // Need to force the replacement byte to 0x3f
  // because JIS_X_0208_Encoder defines its own
  // alternative 2 byte substitution to permit it
  // to exist as a self-standing Encoder

  byte[] replacementBytes = { (byte)0x3f };
  return new Encoder(this).replaceWith(replacementBytes);
    }

    private static class Decoder extends EUC_JP.Decoder {
  JIS_X_0201.Decoder decoderJ0201;
  JIS_X_0212_Solaris_Decoder decodeMappingJ0212;
  JIS_X_0208_Solaris_Decoder decodeMappingJ0208;

  short[] j0208Index1;
  String[] j0208Index2;

        protected final char REPLACE_CHAR='\uFFFD';

  private Decoder(Charset cs) {
      super(cs);
      decoderJ0201 = new JIS_X_0201.Decoder(cs);
      decodeMappingJ0212 = new JIS_X_0212_Solaris_Decoder(cs);
      decodeMappingJ0208 = new JIS_X_0208_Solaris_Decoder(cs);
      decodeMappingJ0208.start = 0xa1;
      decodeMappingJ0208.end = 0xfe;
      j0208Index1 = decodeMappingJ0208.getIndex1();
      j0208Index2 = decodeMappingJ0208.getIndex2();
  }


  protected char decode0212(int byte1, int byte2) {
       return decodeMappingJ0212.decodeDouble(byte1, byte2);

        }

  protected char decodeDouble(int byte1, int byte2) {
      if (byte1 == 0x8e) {
    return decoderJ0201.decode(byte2 - 256);
      }

      if (((byte1 < 0)
          || (byte1 > decodeMappingJ0208.getIndex1().length))
    || ((byte2 < decodeMappingJ0208.start)
    || (byte2 > decodeMappingJ0208.end)))
    return REPLACE_CHAR;

      char result = super.decodeDouble(byte1, byte2);
      if (result != '\uFFFD') {
    return result;
      } else {
    int n = (j0208Index1[byte1 - 0x80] & 0xf) *
      (decodeMappingJ0208.end - decodeMappingJ0208.start + 1)
      + (byte2 - decodeMappingJ0208.start);
    return j0208Index2[j0208Index1[byte1 - 0x80] >> 4].charAt(n);
      }
  }
    }


    private static class Encoder extends EUC_JP.Encoder {

  JIS_X_0201.Encoder encoderJ0201;
  JIS_X_0212_Solaris_Encoder encoderJ0212;
  JIS_X_0208_Solaris_Encoder encoderJ0208;

  short[] j0208Index1;
  String[] j0208Index2;

  private final Surrogate.Parser sgp = new Surrogate.Parser();

  private Encoder(Charset cs) {
      super(cs);
      encoderJ0201 = new JIS_X_0201.Encoder(cs);
      encoderJ0212 = new JIS_X_0212_Solaris_Encoder(cs);
      encoderJ0208 = new JIS_X_0208_Solaris_Encoder(cs);
      j0208Index1 = encoderJ0208.getIndex1();
      j0208Index2 = encoderJ0208.getIndex2();
  }

  protected int encodeSingle(char inputChar, byte[] outputByte) {
      byte b;

      if (inputChar == 0) {
    outputByte[0] = (byte)0;
    return 1;
      }

      if ((b = encoderJ0201.encode(inputChar)) == 0)
    return 0;

      if (b > 0 && b < 128) {
    outputByte[0] = b;
    return 1;
      }

      outputByte[0] = (byte)0x8e;
      outputByte[1] = b;
      return 2;
  }

  protected int encodeDouble(char ch) {
      int r = super.encodeDouble(ch);
      if (r != 0) {
    return r;
      }
      else {
    int offset = j0208Index1[((ch & 0xff00) >> 8 )] << 8;
    r = j0208Index2[offset >> 12].charAt((offset & 0xfff) +
        (ch & 0xFF));
    if (r > 0x7500)
       return 0x8F8080 + encoderJ0212.encodeDouble(ch);
    }
          return (r==0 ? 0: r + 0x8080);
  }
    }
}
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