| // |
| // ======================================================================== |
| // 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.spdy.parser; |
| |
| import java.nio.ByteBuffer; |
| |
| import org.eclipse.jetty.spdy.frames.WindowUpdateFrame; |
| |
| public class WindowUpdateBodyParser extends ControlFrameBodyParser |
| { |
| private final ControlFrameParser controlFrameParser; |
| private State state = State.STREAM_ID; |
| private int cursor; |
| private int streamId; |
| private int windowDelta; |
| |
| public WindowUpdateBodyParser(ControlFrameParser controlFrameParser) |
| { |
| this.controlFrameParser = controlFrameParser; |
| } |
| |
| @Override |
| public boolean parse(ByteBuffer buffer) |
| { |
| while (buffer.hasRemaining()) |
| { |
| switch (state) |
| { |
| case STREAM_ID: |
| { |
| if (buffer.remaining() >= 4) |
| { |
| streamId = buffer.getInt() & 0x7F_FF_FF_FF; |
| state = State.WINDOW_DELTA; |
| } |
| else |
| { |
| state = State.STREAM_ID_BYTES; |
| cursor = 4; |
| } |
| break; |
| } |
| case STREAM_ID_BYTES: |
| { |
| byte currByte = buffer.get(); |
| --cursor; |
| streamId += (currByte & 0xFF) << 8 * cursor; |
| if (cursor == 0) |
| { |
| streamId &= 0x7F_FF_FF_FF; |
| state = State.WINDOW_DELTA; |
| } |
| break; |
| } |
| case WINDOW_DELTA: |
| { |
| if (buffer.remaining() >= 4) |
| { |
| windowDelta = buffer.getInt() & 0x7F_FF_FF_FF; |
| onWindowUpdate(); |
| return true; |
| } |
| else |
| { |
| state = State.WINDOW_DELTA_BYTES; |
| cursor = 4; |
| } |
| break; |
| } |
| case WINDOW_DELTA_BYTES: |
| { |
| byte currByte = buffer.get(); |
| --cursor; |
| windowDelta += (currByte & 0xFF) << 8 * cursor; |
| if (cursor == 0) |
| { |
| windowDelta &= 0x7F_FF_FF_FF; |
| onWindowUpdate(); |
| return true; |
| } |
| break; |
| } |
| default: |
| { |
| throw new IllegalStateException(); |
| } |
| } |
| } |
| return false; |
| } |
| |
| private void onWindowUpdate() |
| { |
| WindowUpdateFrame frame = new WindowUpdateFrame(controlFrameParser.getVersion(), streamId, windowDelta); |
| controlFrameParser.onControlFrame(frame); |
| reset(); |
| } |
| |
| private void reset() |
| { |
| state = State.STREAM_ID; |
| cursor = 0; |
| streamId = 0; |
| windowDelta = 0; |
| } |
| |
| private enum State |
| { |
| STREAM_ID, STREAM_ID_BYTES, WINDOW_DELTA, WINDOW_DELTA_BYTES; |
| } |
| } |