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// ========================================================================
// Copyright 2011-2012 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.extensions.fragment;
import java.io.IOException;
import java.nio.ByteBuffer;
import org.eclipse.jetty.util.Callback;
import org.eclipse.jetty.websocket.api.Extension;
import org.eclipse.jetty.websocket.protocol.ExtensionConfig;
import org.eclipse.jetty.websocket.protocol.OpCode;
import org.eclipse.jetty.websocket.protocol.WebSocketFrame;
public class FragmentExtension extends Extension
{
private int maxLength = -1;
@Override
public <C> void output(C context, Callback<C> callback, final WebSocketFrame frame) throws IOException
{
if (frame.isControlFrame())
{
// Cannot fragment Control Frames
nextOutput(context,callback,frame);
return;
}
int length = frame.getPayloadLength();
byte opcode = frame.getOpCode(); // original opcode
ByteBuffer payload = frame.getPayload().slice();
int originalLimit = payload.limit();
int currentPosition = payload.position();
if (maxLength <= 0)
{
// output original frame
nextOutput(context,callback,frame);
return;
}
boolean continuation = false;
// break apart payload based on maxLength rules
while (length > maxLength)
{
WebSocketFrame frag = new WebSocketFrame(frame);
frag.setOpCode(opcode);
frag.setFin(false); // always false here
frag.setContinuation(continuation);
payload.position(currentPosition);
payload.limit(Math.min(payload.position() + maxLength,originalLimit));
frag.setPayload(payload);
nextOutputNoCallback(frag);
length -= maxLength;
opcode = OpCode.CONTINUATION;
continuation = true;
currentPosition = payload.limit();
}
// write remaining
WebSocketFrame frag = new WebSocketFrame(frame);
frag.setOpCode(opcode);
frag.setFin(frame.isFin()); // use original fin
frag.setContinuation(continuation);
payload.position(currentPosition);
payload.limit(originalLimit);
frag.setPayload(payload);
nextOutput(context,callback,frag);
}
@Override
public void setConfig(ExtensionConfig config)
{
super.setConfig(config);
maxLength = config.getParameter("maxLength",maxLength);
}
}
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