//
// ========================================================================
// 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 java.util.HashMap;
import java.util.Map;
import org.eclipse.jetty.http2.ErrorCodes;
import org.eclipse.jetty.http2.Flags;
import org.eclipse.jetty.http2.frames.SettingsFrame;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
public class SettingsBodyParser extends BodyParser
{
private static final Logger LOG = Log.getLogger(SettingsBodyParser.class);
private State state = State.PREPARE;
private int cursor;
private int length;
private int settingId;
private int settingValue;
private Map<Integer, Integer> settings;
public SettingsBodyParser(HeaderParser headerParser, Parser.Listener listener)
{
super(headerParser, listener);
}
private void reset()
{
state = State.PREPARE;
cursor = 0;
length = 0;
settingId = 0;
settingValue = 0;
settings = null;
}
@Override
protected boolean emptyBody()
{
return onSettings(new HashMap<Integer, Integer>()) == Result.ASYNC;
}
@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_settings_frame");
}
length = getBodyLength();
settings = new HashMap<>();
state = State.SETTING_ID;
break;
}
case SETTING_ID:
{
if (buffer.remaining() >= 2)
{
settingId = buffer.getShort() & 0xFF_FF;
state = State.SETTING_VALUE;
length -= 2;
if (length <= 0)
{
return notifyConnectionFailure(ErrorCodes.FRAME_SIZE_ERROR, "invalid_settings_frame");
}
}
else
{
cursor = 2;
settingId = 0;
state = State.SETTING_ID_BYTES;
}
break;
}
case SETTING_ID_BYTES:
{
int currByte = buffer.get() & 0xFF;
--cursor;
settingId += currByte << (8 * cursor);
--length;
if (length <= 0)
{
return notifyConnectionFailure(ErrorCodes.FRAME_SIZE_ERROR, "invalid_settings_frame");
}
if (cursor == 0)
{
state = State.SETTING_VALUE;
}
break;
}
case SETTING_VALUE:
{
if (buffer.remaining() >= 4)
{
settingValue = buffer.getInt();
if (LOG.isDebugEnabled())
LOG.debug(String.format("setting %d=%d",settingId, settingValue));
settings.put(settingId, settingValue);
state = State.SETTING_ID;
length -= 4;
if (length == 0)
{
return onSettings(settings);
}
}
else
{
cursor = 4;
settingValue = 0;
state = State.SETTING_VALUE_BYTES;
}
break;
}
case SETTING_VALUE_BYTES:
{
int currByte = buffer.get() & 0xFF;
--cursor;
settingValue += currByte << (8 * cursor);
--length;
if (cursor > 0 && length <= 0)
{
return notifyConnectionFailure(ErrorCodes.FRAME_SIZE_ERROR, "invalid_settings_frame");
}
if (cursor == 0)
{
if (LOG.isDebugEnabled())
LOG.debug(String.format("setting %d=%d",settingId, settingValue));
settings.put(settingId, settingValue);
state = State.SETTING_ID;
if (length == 0)
{
return onSettings(settings);
}
}
break;
}
default:
{
throw new IllegalStateException();
}
}
}
return Result.PENDING;
}
private Result onSettings(Map<Integer, Integer> settings)
{
SettingsFrame frame = new SettingsFrame(settings, hasFlag(Flags.ACK));
reset();
return notifySettings(frame) ? Result.ASYNC : Result.COMPLETE;
}
private enum State
{
PREPARE, SETTING_ID, SETTING_ID_BYTES, SETTING_VALUE, SETTING_VALUE_BYTES
}
}