/*

 * Copyright (c) 2001, 2008, Oracle and/or its affiliates. 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.  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.

 */

/**

 * This FilterWriter class takes an existing Writer and uses

 * the 'back-tick U' escape notation to escape characters which are

 * encountered within the input character based stream which

 * are outside the 7-bit ASCII range. The native platforms linefeed

 * character is emitted for each line of processed input

 */

package sun.tools.native2ascii;

import java.io.*;

import java.nio.BufferOverflowException;

class N2AFilter extends FilterWriter {

    public N2AFilter(Writer out) { super(out); }

    public void write(char b) throws IOException {

        char[] buf = new char[1];

        buf[0] = b;

        write(buf, 0, 1);

    }

    public void write(char[] buf, int off, int len) throws IOException {

        String lineBreak = System.getProperty("line.separator");

        //System.err.println ("xx Out buffer length is " + buf.length );

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

            if ((buf[i] > '\u007f')) {

                // write \udddd

                out.write('\\');

                out.write('u');

                String hex =

                    Integer.toHexString(buf[i]);

                StringBuffer hex4 = new StringBuffer(hex);

                hex4.reverse();

                int length = 4 - hex4.length();

                for (int j = 0; j < length; j++) {

                    hex4.append('0');

                }

                for (int j = 0; j < 4; j++) {

                    out.write(hex4.charAt(3 - j));

                }

            } else

                out.write(buf[i]);

        }

    }

}