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Utility classes for Jetty
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//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//

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.
 */
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);
    }
}