| // |
| // ======================================================================== |
| // Copyright (c) 1995-2017 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.ErrorCode; |
| 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 boolean parse(ByteBuffer buffer) |
| { |
| while (buffer.hasRemaining()) |
| { |
| switch (state) |
| { |
| case PREPARE: |
| { |
| // SPEC: wrong streamId is treated as connection error. |
| if (getStreamId() != 0) |
| return connectionFailure(buffer, ErrorCode.PROTOCOL_ERROR.code, "invalid_ping_frame"); |
| // SPEC: wrong body length is treated as connection error. |
| if (getBodyLength() != 8) |
| return connectionFailure(buffer, ErrorCode.FRAME_SIZE_ERROR.code, "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 false; |
| } |
| |
| private boolean onPing(byte[] payload) |
| { |
| PingFrame frame = new PingFrame(payload, hasFlag(Flags.ACK)); |
| reset(); |
| notifyPing(frame); |
| return true; |
| } |
| |
| private enum State |
| { |
| PREPARE, PAYLOAD, PAYLOAD_BYTES |
| } |
| } |