//
// ========================================================================
// 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.frames.ResetFrame;
public class ResetBodyParser extends BodyParser
{
private State state = State.PREPARE;
private int cursor;
private int error;
public ResetBodyParser(HeaderParser headerParser, Parser.Listener listener)
{
super(headerParser, listener);
}
private void reset()
{
state = State.PREPARE;
cursor = 0;
error = 0;
}
@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_rst_stream_frame");
}
int length = getBodyLength();
if (length != 4)
{
return notifyConnectionFailure(ErrorCodes.FRAME_SIZE_ERROR, "invalid_rst_stream_frame");
}
state = State.ERROR;
break;
}
case ERROR:
{
if (buffer.remaining() >= 4)
{
return onReset(buffer.getInt());
}
else
{
state = State.ERROR_BYTES;
cursor = 4;
}
break;
}
case ERROR_BYTES:
{
int currByte = buffer.get() & 0xFF;
--cursor;
error += currByte << (8 * cursor);
if (cursor == 0)
{
return onReset(error);
}
break;
}
default:
{
throw new IllegalStateException();
}
}
}
return Result.PENDING;
}
private Result onReset(int error)
{
ResetFrame frame = new ResetFrame(getStreamId(), error);
reset();
return notifyReset(frame) ? Result.ASYNC : Result.COMPLETE;
}
private enum State
{
PREPARE, ERROR, ERROR_BYTES
}
}