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The Adobe Experience Manager SDK
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// 
// ========================================================================
// Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// 
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// 
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// 
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
// 
package org.eclipse.jetty.util;

import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;

/**
 *  Byte Array ISO 8859 writer.
 *  This class combines the features of a OutputStreamWriter for
 *  ISO8859 encoding with that of a ByteArrayOutputStream.  It avoids
 *  many inefficiencies associated with these standard library classes.
 *  It has been optimized for standard ASCII characters.
 *
 * @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
 */
@Deprecated(since = "2021-05-27")
public class ByteArrayISO8859Writer extends Writer {

    private byte[] _buf;

    private int _size;

    private ByteArrayOutputStream2 _bout = null;

    private OutputStreamWriter _writer = null;

    private boolean _fixed = false;

    /**
     * Constructor.
     */
    public ByteArrayISO8859Writer() {
        _buf = new byte[2048];
    }

    /**
     * Constructor.
     *
     * @param capacity Buffer capacity
     */
    public ByteArrayISO8859Writer(int capacity) {
        _buf = new byte[capacity];
    }

    public ByteArrayISO8859Writer(byte[] buf) {
        _buf = buf;
        _fixed = true;
    }

    public Object getLock() {
        return lock;
    }

    public int size() {
        return _size;
    }

    public int capacity() {
        return _buf.length;
    }

    public int spareCapacity() {
        return _buf.length - _size;
    }

    public void setLength(int l) {
        _size = l;
    }

    public byte[] getBuf() {
        return _buf;
    }

    public void writeTo(OutputStream out) throws IOException {
        out.write(_buf, 0, _size);
    }

    public void write(char c) throws IOException {
        ensureSpareCapacity(1);
        if (c >= 0 && c <= 0x7f)
            _buf[_size++] = (byte) c;
        else {
            char[] ca = { c };
            writeEncoded(ca, 0, 1);
        }
    }

    @Override
    public void write(char[] ca) throws IOException {
        ensureSpareCapacity(ca.length);
        for (int i = 0; i < ca.length; i++) {
            char c = ca[i];
            if (c >= 0 && c <= 0x7f)
                _buf[_size++] = (byte) c;
            else {
                writeEncoded(ca, i, ca.length - i);
                break;
            }
        }
    }

    @Override
    public void write(char[] ca, int offset, int length) throws IOException {
        ensureSpareCapacity(length);
        for (int i = 0; i < length; i++) {
            char c = ca[offset + i];
            if (c >= 0 && c <= 0x7f)
                _buf[_size++] = (byte) c;
            else {
                writeEncoded(ca, offset + i, length - i);
                break;
            }
        }
    }

    @Override
    public void write(String s) throws IOException {
        if (s == null) {
            write("null", 0, 4);
            return;
        }
        int length = s.length();
        ensureSpareCapacity(length);
        for (int i = 0; i < length; i++) {
            char c = s.charAt(i);
            if (c >= 0x0 && c <= 0x7f)
                _buf[_size++] = (byte) c;
            else {
                writeEncoded(s.toCharArray(), i, length - i);
                break;
            }
        }
    }

    @Override
    public void write(String s, int offset, int length) throws IOException {
        ensureSpareCapacity(length);
        for (int i = 0; i < length; i++) {
            char c = s.charAt(offset + i);
            if (c >= 0 && c <= 0x7f)
                _buf[_size++] = (byte) c;
            else {
                writeEncoded(s.toCharArray(), offset + i, length - i);
                break;
            }
        }
    }

    private void writeEncoded(char[] ca, int offset, int length) throws IOException {
        if (_bout == null) {
            _bout = new ByteArrayOutputStream2(2 * length);
            _writer = new OutputStreamWriter(_bout, StandardCharsets.ISO_8859_1);
        } else
            _bout.reset();
        _writer.write(ca, offset, length);
        _writer.flush();
        ensureSpareCapacity(_bout.getCount());
        System.arraycopy(_bout.getBuf(), 0, _buf, _size, _bout.getCount());
        _size += _bout.getCount();
    }

    @Override
    public void flush() {
    }

    public void resetWriter() {
        _size = 0;
    }

    @Override
    public void close() {
    }

    public void destroy() {
        _buf = null;
    }

    public void ensureSpareCapacity(int n) throws IOException {
        if (_size + n > _buf.length) {
            if (_fixed)
                throw new IOException("Buffer overflow: " + _buf.length);
            _buf = Arrays.copyOf(_buf, (_buf.length + n) * 4 / 3);
        }
    }

    public byte[] getByteArray() {
        return Arrays.copyOf(_buf, _size);
    }
}