org.eclipse.jetty.websocket.WebSocketParserD00 Maven / Gradle / Ivy
// ========================================================================
// Copyright (c) 2010 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 org.eclipse.jetty.io.Buffer;
import org.eclipse.jetty.io.Buffers;
import org.eclipse.jetty.io.EndPoint;
import org.eclipse.jetty.util.log.Log;
/* ------------------------------------------------------------ */
/**
* Parser the WebSocket protocol.
*
*/
public class WebSocketParserD00 implements WebSocketParser
{
public static final int STATE_START=0;
public static final int STATE_SENTINEL_DATA=1;
public static final int STATE_LENGTH=2;
public static final int STATE_DATA=3;
private final WebSocketBuffers _buffers;
private final EndPoint _endp;
private final FrameHandler _handler;
private int _state;
private Buffer _buffer;
private byte _opcode;
private int _length;
/* ------------------------------------------------------------ */
/**
* @param buffers The buffers to use for parsing. Only the {@link Buffers#getBuffer()} is used.
* This should be a direct buffer if binary data is mostly used or an indirect buffer if utf-8 data
* is mostly used.
* @param endp
* @param handler
*/
public WebSocketParserD00(WebSocketBuffers buffers, EndPoint endp, FrameHandler handler)
{
_buffers=buffers;
_endp=endp;
_handler=handler;
}
/* ------------------------------------------------------------ */
public boolean isBufferEmpty()
{
return _buffer==null || _buffer.length()==0;
}
/* ------------------------------------------------------------ */
public Buffer getBuffer()
{
return _buffer;
}
/* ------------------------------------------------------------ */
/** Parse to next event.
* Parse to the next {@link FrameHandler} event or until no more data is
* available. Fill data from the {@link EndPoint} only as necessary.
* @return An indication of progress or otherwise. -1 indicates EOF, 0 indicates
* that no bytes were read and no messages parsed. A positive number indicates either
* the bytes filled or the messages parsed.
*/
public int parseNext()
{
if (_buffer==null)
_buffer=_buffers.getBuffer();
int total_filled=0;
// Loop until an datagram call back or can't fill anymore
boolean progress=true;
while(true)
{
int length=_buffer.length();
// Fill buffer if we need a byte or need length
if (length == 0 || _state==STATE_DATA && length<_length)
{
// compact to mark (set at start of data)
_buffer.compact();
// if no space, then the data is too big for buffer
if (_buffer.space() == 0)
throw new IllegalStateException("FULL");
// catch IOExceptions (probably EOF) and try to parse what we have
try
{
int filled=_endp.isOpen()?_endp.fill(_buffer):-1;
if (filled<=0)
return total_filled;
total_filled+=filled;
length=_buffer.length();
}
catch(IOException e)
{
Log.debug(e);
return total_filled>0?total_filled:-1;
}
}
// Parse the buffer byte by byte (unless it is STATE_DATA)
byte b;
charloop: while (length-->0)
{
switch (_state)
{
case STATE_START:
b=_buffer.get();
_opcode=b;
if (_opcode<0)
{
_length=0;
_state=STATE_LENGTH;
}
else
{
_state=STATE_SENTINEL_DATA;
_buffer.mark(0);
}
continue;
case STATE_SENTINEL_DATA:
b=_buffer.get();
if ((b&0xff)==0xff)
{
_state=STATE_START;
int l=_buffer.getIndex()-_buffer.markIndex()-1;
_handler.onFrame(false,(byte)0,_opcode,_buffer.sliceFromMark(l));
_buffer.setMarkIndex(-1);
if (_buffer.length()==0)
{
_buffers.returnBuffer(_buffer);
_buffer=null;
}
return total_filled;
}
continue;
case STATE_LENGTH:
b=_buffer.get();
_length=_length<<7 | (0x7f&b);
if (b>=0)
{
_state=STATE_DATA;
_buffer.mark(0);
}
continue;
case STATE_DATA:
if (_buffer.markIndex()<0)
if (_buffer.length()<_length)
break charloop;
Buffer data=_buffer.sliceFromMark(_length);
_buffer.skip(_length);
_state=STATE_START;
_handler.onFrame(false,(byte)0, _opcode, data);
if (_buffer.length()==0)
{
_buffers.returnBuffer(_buffer);
_buffer=null;
}
return total_filled;
}
}
}
}
/* ------------------------------------------------------------ */
public void fill(Buffer buffer)
{
if (buffer!=null && buffer.length()>0)
{
if (_buffer==null)
_buffer=_buffers.getBuffer();
_buffer.put(buffer);
buffer.clear();
}
}
}