| // |
| // ======================================================================== |
| // Copyright (c) 1995-2015 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.websocket.common.extensions.compress; |
| |
| import java.util.zip.DataFormatException; |
| |
| import org.eclipse.jetty.websocket.api.BadPayloadException; |
| import org.eclipse.jetty.websocket.api.extensions.Frame; |
| |
| /** |
| * Implementation of the |
| * <a href="https://tools.ietf.org/id/draft-tyoshino-hybi-websocket-perframe-deflate.txt">deflate-frame</a> |
| * extension seen out in the wild. |
| */ |
| public class DeflateFrameExtension extends CompressExtension |
| { |
| @Override |
| public String getName() |
| { |
| return "deflate-frame"; |
| } |
| |
| @Override |
| int getRsvUseMode() |
| { |
| return RSV_USE_ALWAYS; |
| } |
| |
| @Override |
| int getTailDropMode() |
| { |
| return TAIL_DROP_ALWAYS; |
| } |
| |
| @Override |
| public void incomingFrame(Frame frame) |
| { |
| // Incoming frames are always non concurrent because |
| // they are read and parsed with a single thread, and |
| // therefore there is no need for synchronization. |
| |
| if ( frame.getType().isControl() || !frame.isRsv1() || !frame.hasPayload() ) |
| { |
| nextIncomingFrame(frame); |
| return; |
| } |
| |
| try |
| { |
| ByteAccumulator accumulator = newByteAccumulator(); |
| decompress(accumulator, frame.getPayload()); |
| decompress(accumulator, TAIL_BYTES_BUF.slice()); |
| forwardIncoming(frame, accumulator); |
| } |
| catch (DataFormatException e) |
| { |
| throw new BadPayloadException(e); |
| } |
| } |
| } |