/*

 * Copyright 1996-2003 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.io;

/**

 * @author Limin Shi

 */

public class ByteToCharEUC_JP extends ByteToCharJIS0208 {

    private byte savedSecond = 0;

    ByteToCharJIS0201 bcJIS0201 = new ByteToCharJIS0201();

    ByteToCharJIS0212 bcJIS0212 = new ByteToCharJIS0212();

    public ByteToCharEUC_JP() {

        super();

        start = 0xA1;

        end = 0xFE;

        savedSecond = 0;

    }

    public int flush(char[] output, int outStart, int outEnd)

        throws MalformedInputException

    {

        if (savedSecond != 0) {

            reset();

            throw new MalformedInputException();

        }

        reset();

        return 0;

    }

    /**

     * Resets the converter.

     * Call this method to reset the converter to its initial state

     */

    public void reset() {

        super.reset();

        savedSecond = 0;

    }

    public String getCharacterEncoding() {

        return "EUC_JP";

    }

    protected char convSingleByte(int b) {

        if (b < 0 || b > 0x7F)

            return REPLACE_CHAR;

        return bcJIS0201.getUnicode(b);

    }

    protected char getUnicode(int byte1, int byte2) {

        if (byte1 == 0x8E) {

            return bcJIS0201.getUnicode(byte2 - 256);

        }

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

        // into ByteToCharDoubleByte.getUnicode()

        if (((byte1 < 0) || (byte1 > index1.length))

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

            return REPLACE_CHAR;

        int n = (index1[byte1 - 0x80] & 0xf) * (end - start + 1)

                + (byte2 - start);

        return index2[index1[byte1 - 0x80] >> 4].charAt(n);

    }

    protected char decode0212(int byte1, int byte2) {

        return bcJIS0212.getUnicode(byte1, byte2);

    }

    /**

     * Converts sequences of bytes to characters.

     * Conversions that result in Exceptions can be restarted by calling

     * convert again, with appropriately modified parameters.

     * @return the characters written to output.

     * @param input byte array containing text in Double/single Byte

     * @param inStart offset in input array

     * @param inEnd offset of last byte to be converted

     * @param output character array to receive conversion result

     * @param outStart starting offset

     * @param outEnd offset of last byte to be written to

     * @throw UnsupportedCharacterException for any bytes

     * that cannot be converted to the external character set.

     */

    public int convert(byte[] input, int inOff, int inEnd,

                       char[] output, int outOff, int outEnd)

        throws UnknownCharacterException,

               ConversionBufferFullException

    {

        char    outputChar = REPLACE_CHAR;

        int     inputSize = 0;          // Size of input

        // Record beginning offsets

        charOff = outOff;

        byteOff = inOff;

        // Loop until we hit the end of the input

        while (byteOff < inEnd) {

            int byte1, byte2;

            if (savedByte == 0) {

                byte1 = input[byteOff];

                inputSize = 1;

            } else {

                byte1 = savedByte;

                savedByte = 0;

                inputSize = 0;

            }

            outputChar = convSingleByte(byte1);

            if (outputChar == REPLACE_CHAR) {   // Multibyte char

                if ((byte1 & 0xff) == 0x8F) {   // JIS0212

                    if (byteOff + inputSize + 1 >= inEnd) {

                        // split in the middle of a character

                        // save the first 2 bytes for next time around

                        savedByte = (byte) byte1;

                        byteOff += inputSize;

                        if (byteOff < inEnd) {

                            savedSecond = input[byteOff];

                            byteOff++;

                        }

                        break;

                    }

                    if (savedSecond != 0) {

                        byte1 = savedSecond & 0xff;

                        savedSecond = 0;

                    } else {

                        byte1 = input[byteOff + inputSize] & 0xff;

                        inputSize++;

                    }

                    byte2 = input[byteOff + inputSize] & 0xff;

                    inputSize++;

                    outputChar = decode0212(byte1-0x80, byte2-0x80);

                } else { // JIS0208

                    if (byteOff + inputSize >= inEnd) {

                        // split in the middle of a character

                        // save the first byte for next time around

                        savedByte = (byte) byte1;

                        byteOff += inputSize;

                        break;

                    }

                    byte1 &= 0xff;

                    byte2 = input[byteOff + inputSize] & 0xff;

                    inputSize++;

                    outputChar = getUnicode(byte1, byte2);

                }

            }

            if (outputChar == REPLACE_CHAR) {

                if (subMode)

                    outputChar = subChars[0];

                else {

                    badInputLength = inputSize;

                    throw new UnknownCharacterException();

                }

            }

            if (charOff >= outEnd)

                throw new ConversionBufferFullException();

            output[charOff++] = outputChar;

            byteOff += inputSize;

        }

        return charOff - outOff;

    }

}