/*

 * Copyright 2002-2004 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.

 */

/*

 */

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

    extends Charset

    implements HistoricallyNamedCharset

{

    public EUC_JP() {

        super("EUC-JP", ExtendedCharsets.aliasesFor("EUC-JP"));

    }

    public String historicalName() {

        return "EUC_JP";

    }

    public boolean contains(Charset cs) {

        return ((cs.name().equals("US-ASCII"))

                || (cs instanceof JIS_X_0201)

                || (cs instanceof JIS_X_0208)

                || (cs instanceof JIS_X_0212)

                || (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);

    }

    static class Decoder extends JIS_X_0208_Decoder

        implements DelegatableDecoder {

        JIS_X_0201.Decoder decoderJ0201;

        JIS_X_0212_Decoder decoderJ0212;

        short[] j0208Index1;

        String[] j0208Index2;

        protected Decoder(Charset cs) {

            super(cs);

            decoderJ0201 = new JIS_X_0201.Decoder(cs);

            decoderJ0212 = new JIS_X_0212_Decoder(cs);

            start = 0xa1;

            end = 0xfe;

            j0208Index1 = super.getIndex1();

            j0208Index2 = super.getIndex2();

        }

        protected char decode0212(int byte1, int byte2) {

             return decoderJ0212.decodeDouble(byte1, byte2);

        }

        protected char decodeDouble(int byte1, int byte2) {

            if (byte1 == 0x8e) {

                return decoderJ0201.decode(byte2 - 256);

            }

            // Fix for bug 4121358 - similar fix for bug 4117820 put

            // into ByteToCharDoubleByte.getUnicode()

            if (((byte1 < 0) || (byte1 > getIndex1().length))

                || ((byte2 < start) || (byte2 > end)))

                return REPLACE_CHAR;

            int n = (j0208Index1[byte1 - 0x80] & 0xf) * (end - start + 1)

                    + (byte2 - start);

            return j0208Index2[j0208Index1[byte1 - 0x80] >> 4].charAt(n);

        }

        private CoderResult decodeArrayLoop(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);

            int b1 = 0, b2 = 0;

            int inputSize = 0;

            char outputChar = REPLACE_CHAR; // U+FFFD;

            try {

                while (sp < sl) {

                    b1 = sa[sp] & 0xff;

                    inputSize = 1;

                    if ((b1 & 0x80) == 0) {

                        outputChar = (char)b1;

                    }

                    else {      // Multibyte char

                        if ((b1 & 0xff) == 0x8f) {   // JIS0212

                            if (sp + 3 > sl)

                               return CoderResult.UNDERFLOW;

                            b1 = sa[sp + 1] & 0xff;

                            b2 = sa[sp + 2] & 0xff;

                            inputSize += 2;

                            outputChar = decode0212(b1-0x80, b2-0x80);

                        } else {

                          // JIS0208

                            if (sp + 2 > sl)

                               return CoderResult.UNDERFLOW;

                            b2 = sa[sp + 1] & 0xff;

                            inputSize++;

                            outputChar = decodeDouble(b1, b2);

                        }

                    }

                    if (outputChar == REPLACE_CHAR) { // can't be decoded

                        return CoderResult.unmappableForLength(inputSize);

                    }

                    if (dp + 1 > dl)

                        return CoderResult.OVERFLOW;

                    da[dp++] = outputChar;

                    sp += inputSize;

                }

                return CoderResult.UNDERFLOW;

            } finally {

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

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

            }

        }

        private CoderResult decodeBufferLoop(ByteBuffer src,

                                             CharBuffer dst)

        {

            int mark = src.position();

            int b1 = 0, b2 = 0;

            int inputSize = 0;

            char outputChar = REPLACE_CHAR; // U+FFFD;

            try {

                while (src.hasRemaining()) {

                    b1 = src.get() & 0xff;

                    inputSize = 1;

                    if ((b1 & 0x80) == 0) {

                        outputChar = (char)b1;

                    } else {    // Multibyte char

                        if ((b1 & 0xff) == 0x8f) {   // JIS0212

                            if (src.remaining() < 2)

                               return CoderResult.UNDERFLOW;

                            b1 = src.get() & 0xff;

                            b2 = src.get() & 0xff;

                            inputSize += 2;

                            outputChar = decode0212(b1-0x80, b2-0x80);

                        } else {

                          // JIS0208

                            if (src.remaining() < 1)

                               return CoderResult.UNDERFLOW;

                            b2 = src.get() & 0xff;

                            inputSize++;

                            outputChar = decodeDouble(b1, b2);

                        }

                    }

                    if (outputChar == REPLACE_CHAR) {

                        return CoderResult.unmappableForLength(inputSize);

                    }

                if (dst.remaining() < 1)

                    return CoderResult.OVERFLOW;

                dst.put(outputChar);

                mark += inputSize;

                }

                return CoderResult.UNDERFLOW;

            } finally {

                src.position(mark);

            }

        }

        // Make some protected methods public for use by JISAutoDetect

        public CoderResult decodeLoop(ByteBuffer src, CharBuffer dst) {

            if (src.hasArray() && dst.hasArray())

                return decodeArrayLoop(src, dst);

            else

                return decodeBufferLoop(src, dst);

        }

        public void implReset() {

            super.implReset();

        }

        public CoderResult implFlush(CharBuffer out) {

            return super.implFlush(out);

        }

    }

    static class Encoder extends JIS_X_0208_Encoder {

        JIS_X_0201.Encoder encoderJ0201;

        JIS_X_0212_Encoder encoderJ0212;

        short[] j0208Index1;

        String[] j0208Index2;

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

        protected Encoder(Charset cs) {

            super(cs, 3.0f, 3.0f);

            encoderJ0201 = new JIS_X_0201.Encoder(cs);

            encoderJ0212 = new JIS_X_0212_Encoder(cs);

            j0208Index1 = super.getIndex1();

            j0208Index2 = super.getIndex2();

        }

        public boolean canEncode(char c) {

            byte[]  encodedBytes = new byte[3];

            if (encodeSingle(c, encodedBytes) == 0) { //doublebyte

                if (encodeDouble(c) == 0)

                    return false;

            }

            return true;

        }

        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 offset = j0208Index1[((ch & 0xff00) >> 8 )] << 8;

            int r = j0208Index2[offset >> 12].charAt((offset & 0xfff) +

                    (ch & 0xff));

            if (r != 0)

                return r + 0x8080;

            r = encoderJ0212.encodeDouble(ch);

            if (r == 0)

                return r;

            return r + 0x8F8080;

        }

        private CoderResult encodeArrayLoop(CharBuffer src,

                                            ByteBuffer dst)

        {

            char[] sa = src.array();

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

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

            assert (sp <= sl);

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

            byte[] da = dst.array();

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

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

            assert (dp <= dl);

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

            int outputSize = 0;

            byte[]  outputByte;

            int     inputSize = 0;                 // Size of input

            byte[]  tmpBuf = new byte[3];

            try {

                while (sp < sl) {

                    outputByte = tmpBuf;

                    char c = sa[sp];

                        if (sgp.parse(c, sa, sp, sl) < 0)

                            return sgp.error();

                        return sgp.unmappableResult();

                    }

                    outputSize = encodeSingle(c, outputByte);

                    if (outputSize == 0) { // DoubleByte

                        int ncode = encodeDouble(c);

                        if (ncode != 0 ) {

                            if ((ncode & 0xFF0000) == 0) {

                                outputByte[0] = (byte) ((ncode & 0xff00) >> 8);

                                outputByte[1] = (byte) (ncode & 0xff);

                                outputSize = 2;

                            } else {

                                outputByte[0] = (byte) 0x8f;

                                outputByte[1] = (byte) ((ncode & 0xff00) >> 8);

                                outputByte[2] = (byte) (ncode & 0xff);

                                outputSize = 3;

                            }

                        } else {

                                return CoderResult.unmappableForLength(1);

                        }

                    }

                    if (dl - dp < outputSize)

                        return CoderResult.OVERFLOW;

                    // Put the byte in the output buffer

                    for (int i = 0; i < outputSize; i++) {

                        da[dp++] = outputByte[i];

                    }

                    sp++;

                }

                return CoderResult.UNDERFLOW;

            } finally {

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

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

            }

        }

        private CoderResult encodeBufferLoop(CharBuffer src,

                                             ByteBuffer dst)

        {

            int outputSize = 0;

            byte[]  outputByte;

            int     inputSize = 0;                 // Size of input

            byte[]  tmpBuf = new byte[3];

            int mark = src.position();

            try {

                while (src.hasRemaining()) {

                    outputByte = tmpBuf;

                    char c = src.get();

                        if (sgp.parse(c, src) < 0)

                            return sgp.error();

                        return sgp.unmappableResult();

                    }

                    outputSize = encodeSingle(c, outputByte);

                    if (outputSize == 0) { // DoubleByte

                        int ncode = encodeDouble(c);

                        if (ncode != 0 ) {

                            if ((ncode & 0xFF0000) == 0) {

                                outputByte[0] = (byte) ((ncode & 0xff00) >> 8);

                                outputByte[1] = (byte) (ncode & 0xff);

                                outputSize = 2;

                            } else {

                                outputByte[0] = (byte) 0x8f;

                                outputByte[1] = (byte) ((ncode & 0xff00) >> 8);

                                outputByte[2] = (byte) (ncode & 0xff);

                                outputSize = 3;

                            }

                        } else {

                                return CoderResult.unmappableForLength(1);

                        }

                    }

                    if (dst.remaining() < outputSize)

                        return CoderResult.OVERFLOW;

                    // Put the byte in the output buffer

                    for (int i = 0; i < outputSize; i++) {

                        dst.put(outputByte[i]);

                    }

                    mark++;

                }

                return CoderResult.UNDERFLOW;

            } finally {

                src.position(mark);

            }

        }

        protected CoderResult encodeLoop(CharBuffer src,

                                         ByteBuffer dst)

        {

            if (src.hasArray() && dst.hasArray())

                return encodeArrayLoop(src, dst);

            else

                return encodeBufferLoop(src, dst);

        }

    }

}