/*

 * Copyright 1997-2000 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 Tom Zhou

*/

public abstract class CharToByteISO2022 extends CharToByteConverter

{

    private final byte ISO_ESC = 0x1b;

    private final byte ISO_SI = 0x0f;

    private final byte ISO_SO = 0x0e;

    private final byte ISO_SS2_7 = 0x4e;

    private final byte ISO_SS3_7 = 0x4f;

    private final byte SS2 = (byte)0x8e;

    private final byte P2 = (byte)0xA2;

    private final byte P3 = (byte)0xA3;

    private final byte MSB = (byte)0x80;

    protected final byte maximumDesignatorLength = 4;

    protected String SODesignator,

                     SS2Designator = null,

                     SS3Designator = null;

    protected CharToByteConverter codeConverter;

    private boolean shiftout = false;

    private boolean SODesDefined = false;

    private boolean SS2DesDefined = false;

    private boolean SS3DesDefined = false;

    private boolean newshiftout = false;

    private boolean newSODesDefined = false;

    private boolean newSS2DesDefined = false;

    private boolean newSS3DesDefined = false;

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

        throws MalformedInputException

    {

        reset();

        return 0;

    }

    public void reset() {

        shiftout = false;

        SODesDefined = false;

        SS2DesDefined = false;

        SS3DesDefined = false;

        byteOff = charOff = 0;

    }

    public boolean canConvert(char ch)

    {

        if (ch<0x80)

           return true;

        return codeConverter.canConvert(ch);

    }

    private int unicodeToNative(char unicode, byte ebyte[])

    {

        int     index = 0;

        byte    tmpByte[];

        byte    convByte[] = new byte[codeConverter.getMaxBytesPerChar()];

        char    convChar[] = {unicode};

        int     converted;

        try{

            converted = codeConverter.convert(convChar, 0, 1, convByte, 0,

                                        codeConverter.getMaxBytesPerChar());

        } catch(Exception e) {

            return -1;

        }

        if (converted == 2) {

            if (!SODesDefined) {

                newSODesDefined = true;

                ebyte[0] = ISO_ESC;

                tmpByte = SODesignator.getBytes();

                System.arraycopy(tmpByte,0,ebyte,1,tmpByte.length);

                index = tmpByte.length+1;

            }

            if (!shiftout) {

                newshiftout = true;

                ebyte[index++] = ISO_SO;

            }

            ebyte[index++] = (byte)(convByte[0]&0x7f);

            ebyte[index++] = (byte)(convByte[1]&0x7f);

        } else {

            if((convByte[0] == SS2)&&(convByte[1] == P2)) {

                if (!SS2DesDefined) {

                    newSS2DesDefined = true;

                    ebyte[0] = ISO_ESC;

                    tmpByte = SS2Designator.getBytes();

                    System.arraycopy(tmpByte,0,ebyte,1,tmpByte.length);

                    index = tmpByte.length+1;

                }

                ebyte[index++] = ISO_ESC;

                ebyte[index++] = ISO_SS2_7;

                ebyte[index++] = (byte)(convByte[2]&0x7f);

                ebyte[index++] = (byte)(convByte[3]&0x7f);

            }

            if((convByte[0] == SS2)&&(convByte[1] == 0xA3))

            {

                if(!SS3DesDefined){

                    newSS3DesDefined = true;

                    ebyte[0] = ISO_ESC;

                    tmpByte = SS3Designator.getBytes();

                    System.arraycopy(tmpByte,0,ebyte,1,tmpByte.length);

                    index = tmpByte.length+1;

                }

                ebyte[index++] = ISO_ESC;

                ebyte[index++] = ISO_SS3_7;

                ebyte[index++] = (byte)(convByte[2]&0x7f);

                ebyte[index++] = (byte)(convByte[3]&0x7f);

            }

        }

        return index;

    }

    /**

     * Character conversion

     */

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

                       byte[] output, int outOff, int outEnd)

        throws UnknownCharacterException, MalformedInputException,

               ConversionBufferFullException

    {

        int outputSize;

        byte [] tmpbuf = new byte[this.getMaxBytesPerChar()];

        byte [] outputByte;

        byteOff = outOff;

        newshiftout = shiftout;

        newSODesDefined = SODesDefined;

        newSS2DesDefined = SS2DesDefined;

        newSS3DesDefined = SS3DesDefined;

        //Fixed 4122961 by bringing the charOff++ out to this

        // loop where it belongs, changing the loop from

        // while(){} to for(){}.

        for (charOff = inOff; charOff < inEnd; charOff++) {

            outputByte = tmpbuf;

            if (input[charOff] < 0x80) {        // ASCII

                if (shiftout){

                    newshiftout = false;

                    outputSize = 2;

                    outputByte[0] = ISO_SI;

                    outputByte[1] = (byte)(input[charOff] & 0x7f);

                } else {

                    outputSize = 1;

                    outputByte[0] = (byte)(input[charOff] & 0x7f);

                }

                if(input[charOff] == '\n'){

                    newSODesDefined = false;

                    newSS2DesDefined = false;

                    newSS3DesDefined = false;

                }

            } else {

                outputSize = unicodeToNative(input[charOff], outputByte);

            }

            if (outputSize == -1) {

                if (subMode) {

                    if(!newSODesDefined){

                        newSODesDefined = !newSODesDefined;

                        outputByte[0] = ISO_SO;

                        outputByte[1] = (byte)'?';

                        outputSize = 2;

                    } else {

                        outputByte = subBytes;

                        outputSize = subBytes.length;

                    }

                } else {

                    badInputLength = 1;

                    throw new UnknownCharacterException();

                }

            }

            if (outEnd - byteOff < outputSize)

                throw new ConversionBufferFullException();

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

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

            // Bug 4266772. Update statuses only when output buffer has been

            // updated. When ConversionBufferFullException() has been throwed

            // we want to keep old statuses for next call.

            shiftout = newshiftout;

            SODesDefined = newSODesDefined;

            SS2DesDefined = newSS2DesDefined;

            SS3DesDefined = newSS3DesDefined;

        }

        return byteOff - outOff;

    }

}