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//
// ========================================================================
// Copyright (c) 1995-2013 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.websocket;
import java.io.IOException;
import java.util.Map;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;
import org.eclipse.jetty.io.Buffer;
import org.eclipse.jetty.io.ByteArrayBuffer;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/**
* TODO Implement proposed deflate frame draft
*/
public class DeflateFrameExtension extends AbstractExtension
{
private static final Logger LOG = Log.getLogger(DeflateFrameExtension.class);
private int _minLength=8;
private Deflater _deflater;
private Inflater _inflater;
public DeflateFrameExtension()
{
super("x-deflate-frame");
}
@Override
public boolean init(Map<String, String> parameters)
{
if (!parameters.containsKey("minLength"))
parameters.put("minLength",Integer.toString(_minLength));
if(super.init(parameters))
{
_minLength=getInitParameter("minLength",_minLength);
_deflater=new Deflater();
_inflater=new Inflater();
return true;
}
return false;
}
/* (non-Javadoc)
* @see org.eclipse.jetty.websocket.AbstractExtension#onFrame(byte, byte, org.eclipse.jetty.io.Buffer)
*/
@Override
public void onFrame(byte flags, byte opcode, Buffer buffer)
{
if (getConnection().isControl(opcode) || !isFlag(flags,1))
{
super.onFrame(flags,opcode,buffer);
return;
}
if (buffer.array()==null)
buffer=buffer.asMutableBuffer();
int length=0xff&buffer.get();
if (length>=0x7e)
{
int b=(length==0x7f)?8:2;
length=0;
while(b-->0)
length=0x100*length+(0xff&buffer.get());
}
// TODO check a max framesize
_inflater.setInput(buffer.array(),buffer.getIndex(),buffer.length());
ByteArrayBuffer buf = new ByteArrayBuffer(length);
try
{
while(_inflater.getRemaining()>0)
{
int inflated=_inflater.inflate(buf.array(),buf.putIndex(),buf.space());
if (inflated==0)
throw new DataFormatException("insufficient data");
buf.setPutIndex(buf.putIndex()+inflated);
}
super.onFrame(clearFlag(flags,1),opcode,buf);
}
catch(DataFormatException e)
{
LOG.warn(e);
getConnection().close(WebSocketConnectionRFC6455.CLOSE_BAD_PAYLOAD,e.toString());
}
}
/* (non-Javadoc)
* @see org.eclipse.jetty.websocket.AbstractExtension#addFrame(byte, byte, byte[], int, int)
*/
@Override
public void addFrame(byte flags, byte opcode, byte[] content, int offset, int length) throws IOException
{
if (getConnection().isControl(opcode) || length<_minLength)
{
super.addFrame(clearFlag(flags,1),opcode,content,offset,length);
return;
}
// prepare the uncompressed input
_deflater.reset();
_deflater.setInput(content,offset,length);
_deflater.finish();
// prepare the output buffer
byte[] out= new byte[length];
int out_offset=0;
// write the uncompressed length
if (length>0xffff)
{
out[out_offset++]=0x7f;
out[out_offset++]=(byte)0;
out[out_offset++]=(byte)0;
out[out_offset++]=(byte)0;
out[out_offset++]=(byte)0;
out[out_offset++]=(byte)((length>>24)&0xff);
out[out_offset++]=(byte)((length>>16)&0xff);
out[out_offset++]=(byte)((length>>8)&0xff);
out[out_offset++]=(byte)(length&0xff);
}
else if (length >=0x7e)
{
out[out_offset++]=0x7e;
out[out_offset++]=(byte)(length>>8);
out[out_offset++]=(byte)(length&0xff);
}
else
{
out[out_offset++]=(byte)(length&0x7f);
}
int l = _deflater.deflate(out,out_offset,length-out_offset);
if (_deflater.finished())
super.addFrame(setFlag(flags,1),opcode,out,0,l+out_offset);
else
super.addFrame(clearFlag(flags,1),opcode,content,offset,length);
}
}
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