sun/io/CharToByteUnicode.java

	CharToByteUnicode.java revision 2116
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee/*
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * Copyright 1996-2002 Sun Microsystems, Inc.  All Rights Reserved.
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee *
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * This code is free software; you can redistribute it and/or modify it
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * under the terms of the GNU General Public License version 2 only, as
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * published by the Free Software Foundation.  Sun designates this
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * particular file as subject to the "Classpath" exception as provided
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * by Sun in the LICENSE file that accompanied this code.
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee *
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * This code is distributed in the hope that it will be useful, but WITHOUT
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * version 2 for more details (a copy is included in the LICENSE file that
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * accompanied this code).
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee *
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * You should have received a copy of the GNU General Public License version
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * 2 along with this work; if not, write to the Free Software Foundation,
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee *
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * CA 95054 USA or visit www.sun.com if you need additional information or
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * have any questions.
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee */
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomeepackage sun.io;
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomeeimport java.io.*;
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee/**
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * Convert arrays containing Unicode characters into arrays of bytes, using the
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * platform-default byte order.
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee *
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee * @author      Mark Reinhold
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee */
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomeepublic class CharToByteUnicode extends CharToByteConverter {
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee    static final char BYTE_ORDER_MARK = (char) 0xfeff;
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee    protected boolean usesMark = true;      /* A mark should be written */
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee    private boolean markWritten = false;  /* A mark has been written */
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee    static final int UNKNOWN = 0;
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee    static final int BIG = 1;
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee    static final int LITTLE = 2;
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee    protected int byteOrder = UNKNOWN;
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee    public CharToByteUnicode() {
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        String enc = java.security.AccessController.doPrivileged(
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee           new sun.security.action.GetPropertyAction("sun.io.unicode.encoding",
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee                                                          "UnicodeBig"));
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        if (enc.equals("UnicodeBig"))
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee            byteOrder = BIG;
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        else if (enc.equals("UnicodeLittle"))
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee            byteOrder = LITTLE;
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        else
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee            byteOrder = BIG;
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee    }
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee    public CharToByteUnicode(int byteOrder, boolean usesMark) {
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        this.byteOrder = byteOrder;
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        this.usesMark = usesMark;
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee    }
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee    public CharToByteUnicode(boolean usesMark) {
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        this();
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        this.usesMark = usesMark;
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee    }
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee    public String getCharacterEncoding() {
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        switch (byteOrder) {
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        case BIG:
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee            return usesMark ? "UnicodeBig" : "UnicodeBigUnmarked";
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        case LITTLE:
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee            return usesMark ? "UnicodeLittle" : "UnicodeLittleUnmarked";
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        default:
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee            return "UnicodeUnknown";
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        }
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee    }
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee    public int convert(char in[], int inOff, int inEnd,
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee                       byte out[], int outOff, int outEnd)
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        throws ConversionBufferFullException, MalformedInputException
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee    {
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        charOff = inOff;
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        byteOff = outOff;
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        if (inOff >= inEnd)
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee            return 0;
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        int inI = inOff,
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee            outI = outOff,
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee            outTop = outEnd - 2;
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee        if (usesMark && !markWritten) {
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee            if (outI > outTop)
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee                throw new ConversionBufferFullException();
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee            if (byteOrder == BIG) {
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee                out[outI++] = (byte) (BYTE_ORDER_MARK >> 8);
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee                out[outI++] = (byte) (BYTE_ORDER_MARK & 0xff);
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee            }
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee            else {
23b5c241225a8ade2b6b9f06ebb891ee459e3b02tomee                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 */
    }

}