/*

 * Copyright 1996-1999 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 CharToByteEUC_JP extends CharToByteJIS0208 {

    CharToByteJIS0201 cbJIS0201 = new CharToByteJIS0201();

    CharToByteJIS0212 cbJIS0212 = new CharToByteJIS0212();

    public String getCharacterEncoding() {

        return "EUC_JP";

    }

    protected int convSingleByte(char inputChar, byte[] outputByte) {

        byte b;

        if (inputChar == 0) {

            outputByte[0] = (byte)0;

            return 1;

        }

        if ((b = cbJIS0201.getNative(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 getNative(char ch) {

        int offset = index1[((ch & 0xff00) >> 8 )] << 8;

        int r = index2[offset >> 12].charAt((offset & 0xfff) + (ch & 0xff));

        if (r != 0)

            return r + 0x8080;

        r = cbJIS0212.getNative(ch);

        if (r == 0)

            return r;

        return r + 0x8F8080;

    }

    /**

     * Converts characters to sequences of bytes.

     * Conversions that result in Exceptions can be restarted by calling

     * convert again, with appropriately modified parameters.

     * @return the characters written to output.

     * @param input char array containing text in Unicode

     * @param inStart offset in input array

     * @param inEnd offset of last byte to be converted

     * @param output byte array to receive conversion result

     * @param outStart starting offset

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

     * @throw UnsupportedCharacterException for any character

     * that cannot be converted to the external character set.

     */

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

                       byte[] output, int outOff, int outEnd)

        throws MalformedInputException, UnknownCharacterException,

               ConversionBufferFullException

    {

        char    inputChar;                 // Input character to be converted

        byte[]  outputByte;                // Output byte written to output

        int     inputSize = 0;             // Size of input

        int     outputSize = 0;            // Size of output

        byte[]  tmpbuf = new byte[4];

        // Record beginning offsets

        charOff = inOff;

        byteOff = outOff;

        if (highHalfZoneCode != 0) {

            inputChar = highHalfZoneCode;

            highHalfZoneCode = 0;

            if (input[inOff] >= 0xdc00 && input[inOff] <= 0xdfff) {

                // This is legal UTF16 sequence.

                badInputLength = 1;

                throw new UnknownCharacterException();

            } else {

                // This is illegal UTF16 sequence.

                badInputLength = 0;

                throw new MalformedInputException();

            }

        }

        // Loop until we hit the end of the input

        while(charOff < inEnd) {

            inputSize = 1;

            outputByte = tmpbuf;

            inputChar = input[charOff]; // Get the input character

            // Is this a high surrogate?

            if(inputChar >= '\uD800' && inputChar <= '\uDBFF') {

                // Is this the last character of the input?

                if (charOff + 1 >= inEnd) {

                    highHalfZoneCode = inputChar;

                    break;

                }

                // Is there a low surrogate following?

                inputChar = input[charOff + 1];

                if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') {

                    // We have a valid surrogate pair.  Too bad we don't do

                    // surrogates.  Is substitution enabled?

                    if (subMode) {

                        outputByte = subBytes;

                        outputSize = subBytes.length;

                        inputSize = 2;

                    } else {

                        badInputLength = 2;

                        throw new UnknownCharacterException();

                    }

                } else {

                    // We have a malformed surrogate pair

                    badInputLength = 1;

                    throw new MalformedInputException();

                }

            }

            // Is this an unaccompanied low surrogate?

            else if (inputChar >= '\uDC00' && inputChar <= '\uDFFF') {

                badInputLength = 1;

                throw new MalformedInputException();

            } else {

                outputSize = convSingleByte(inputChar, outputByte);

                if (outputSize == 0) { // DoubleByte

                    int ncode = getNative(inputChar);

                    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 {

                        if (subMode) {

                            outputByte = subBytes;

                            outputSize = subBytes.length;

                        } else {

                            badInputLength = 1;

                            throw new UnknownCharacterException();

                        }

                    }

                }

            }

            // If we don't have room for the output, throw an exception

            if (byteOff + outputSize > outEnd)

                throw new ConversionBufferFullException();

            // Put the byte in the output buffer

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

                output[byteOff++] = outputByte[i];

            }

            charOff += inputSize;

        }

        // Return the length written to the output buffer

        return byteOff - outOff;

    }

    /**

     * the maximum number of bytes needed to hold a converted char

     * @returns the maximum number of bytes needed for a converted char

     */

    public int getMaxBytesPerChar() {

        return 3;

    }

}