/*

 * 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.io;

import java.io.*;

/**

 * Convert arrays containing Unicode characters into arrays of bytes, using the

 * platform-default byte order.

 *

 * @author      Mark Reinhold

 */

public class CharToByteUnicode extends CharToByteConverter {

    static final char BYTE_ORDER_MARK = (char) 0xfeff;

    protected boolean usesMark = true;      /* A mark should be written */

    private boolean markWritten = false;  /* A mark has been written */

    static final int UNKNOWN = 0;

    static final int BIG = 1;

    static final int LITTLE = 2;

    protected int byteOrder = UNKNOWN;

    public CharToByteUnicode() {

        String enc = java.security.AccessController.doPrivileged(

           new sun.security.action.GetPropertyAction("sun.io.unicode.encoding",

                                                          "UnicodeBig"));

        if (enc.equals("UnicodeBig"))

            byteOrder = BIG;

        else if (enc.equals("UnicodeLittle"))

            byteOrder = LITTLE;

        else

            byteOrder = BIG;

    }

    public CharToByteUnicode(int byteOrder, boolean usesMark) {

        this.byteOrder = byteOrder;

        this.usesMark = usesMark;

    }

    public CharToByteUnicode(boolean usesMark) {

        this();

        this.usesMark = usesMark;

    }

    public String getCharacterEncoding() {

        switch (byteOrder) {

        case BIG:

            return usesMark ? "UnicodeBig" : "UnicodeBigUnmarked";

        case LITTLE:

            return usesMark ? "UnicodeLittle" : "UnicodeLittleUnmarked";

        default:

            return "UnicodeUnknown";

        }

    }

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

                       byte out[], int outOff, int outEnd)

        throws ConversionBufferFullException, MalformedInputException

    {

        charOff = inOff;

        byteOff = outOff;

        if (inOff >= inEnd)

            return 0;

        int inI = inOff,

            outI = outOff,

            outTop = outEnd - 2;

        if (usesMark && !markWritten) {

            if (outI > outTop)

                throw new ConversionBufferFullException();

            if (byteOrder == BIG) {

                out[outI++] = (byte) (BYTE_ORDER_MARK >> 8);

                out[outI++] = (byte) (BYTE_ORDER_MARK & 0xff);

            }

            else {

                out[outI++] = (byte) (BYTE_ORDER_MARK & 0xff);

                out[outI++] = (byte) (BYTE_ORDER_MARK >> 8);

            }

            markWritten = true;

        }

        if (byteOrder == BIG) {

            while (inI < inEnd) {

                if (outI > outTop) {

                    charOff = inI;

                    byteOff = outI;

                    throw new ConversionBufferFullException();

                }

                char c = in[inI++];

                out[outI++] = (byte) (c >> 8);

                out[outI++] = (byte) (c & 0xff);

            }

        }

        else {

            while (inI < inEnd) {

                if (outI > outTop) {

                    charOff = inI;

                    byteOff = outI;

                    throw new ConversionBufferFullException();

                }

                char c = in[inI++];

                out[outI++] = (byte) (c & 0xff);

                out[outI++] = (byte) (c >> 8);

            }

        }

        charOff = inI;

        byteOff = outI;

        return outI - outOff;

    }

    public int flush(byte in[], int inOff, int inEnd) {

        byteOff = charOff = 0;

        return 0;

    }

    public void reset () {

        byteOff = charOff = 0;

        markWritten = false;

    }

    public int getMaxBytesPerChar() {

        return 4;               /* To allow for writing the byte-order mark */

    }

}