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//
// ========================================================================
// Copyright (c) 1995-2015 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// 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.servlets.gzip;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.zip.Deflater;
/**
* Reimplementation of {@link java.util.zip.DeflaterOutputStream} that supports reusing the buffer.
*/
public class DeflatedOutputStream extends FilterOutputStream
{
protected final Deflater _def;
protected final byte[] _buf;
protected boolean closed = false;
public DeflatedOutputStream(OutputStream out, Deflater deflater, byte[] buffer)
{
super(out);
_def = deflater;
_buf = buffer;
}
@Override
public void write(int b) throws IOException
{
byte[] buf = new byte[1];
buf[0] = (byte)(b & 0xff);
write(buf,0,1);
}
@Override
public void write(byte[] b, int off, int len) throws IOException
{
if (_def.finished())
throw new IOException("Stream already finished");
if ((off | len | (off + len) | (b.length - (off + len))) < 0)
throw new IndexOutOfBoundsException();
if (len == 0)
return;
if (!_def.finished())
{
_def.setInput(b,off,len);
while (!_def.needsInput())
{
deflate();
}
}
}
private void deflate() throws IOException
{
int len = _def.deflate(_buf,0,_buf.length);
if (len > 0)
{
out.write(_buf,0,len);
}
}
public synchronized void finish() throws IOException
{
if (!_def.finished())
{
_def.finish();
while (!_def.finished())
{
deflate();
}
}
}
@Override
public synchronized void close() throws IOException
{
if (!closed)
{
finish();
out.close();
closed = true;
}
}
}
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