//
// ========================================================================
// Copyright (c) 1995-2014 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.http2.parser;
import java.nio.ByteBuffer;
import org.eclipse.jetty.http2.ErrorCodes;
import org.eclipse.jetty.http2.Flags;
import org.eclipse.jetty.http2.frames.PingFrame;
public class PingBodyParser extends BodyParser
{
private State state = State.PREPARE;
private int cursor;
private byte[] payload;
public PingBodyParser(HeaderParser headerParser, Parser.Listener listener)
{
super(headerParser, listener);
}
private void reset()
{
state = State.PREPARE;
cursor = 0;
payload = null;
}
@Override
public Result parse(ByteBuffer buffer)
{
while (buffer.hasRemaining())
{
switch (state)
{
case PREPARE:
{
// SPEC: wrong streamId is treated as connection error.
if (getStreamId() != 0)
{
return notifyConnectionFailure(ErrorCodes.PROTOCOL_ERROR, "invalid_ping_frame");
}
// SPEC: wrong body length is treated as connection error.
if (getBodyLength() != 8)
{
return notifyConnectionFailure(ErrorCodes.FRAME_SIZE_ERROR, "invalid_ping_frame");
}
state = State.PAYLOAD;
break;
}
case PAYLOAD:
{
payload = new byte[8];
if (buffer.remaining() >= 8)
{
buffer.get(payload);
return onPing(payload);
}
else
{
state = State.PAYLOAD_BYTES;
cursor = 8;
}
break;
}
case PAYLOAD_BYTES:
{
payload[8 - cursor] = buffer.get();
--cursor;
if (cursor == 0)
{
return onPing(payload);
}
break;
}
default:
{
throw new IllegalStateException();
}
}
}
return Result.PENDING;
}
private Result onPing(byte[] payload)
{
PingFrame frame = new PingFrame(payload, hasFlag(Flags.ACK));
reset();
return notifyPing(frame) ? Result.ASYNC : Result.COMPLETE;
}
private enum State
{
PREPARE, PAYLOAD, PAYLOAD_BYTES
}
}