io.netty.handler.codec.http.websocketx.extensions.compression.PerFrameDeflateDecoder Maven / Gradle / Ivy
/*
* Copyright 2014 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.handler.codec.http.websocketx.extensions.compression;
import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame;
import io.netty.handler.codec.http.websocketx.ContinuationWebSocketFrame;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import io.netty.handler.codec.http.websocketx.extensions.WebSocketExtension;
import io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionFilter;
/**
* Per-frame implementation of deflate decompressor.
*/
class PerFrameDeflateDecoder extends DeflateDecoder {
/**
* Constructor
*
* @param noContext true to disable context takeover.
*/
PerFrameDeflateDecoder(boolean noContext) {
super(noContext, WebSocketExtensionFilter.NEVER_SKIP);
}
/**
* Constructor
*
* @param noContext true to disable context takeover.
* @param extensionDecoderFilter extension decoder filter for per frame deflate decoder.
*/
PerFrameDeflateDecoder(boolean noContext, WebSocketExtensionFilter extensionDecoderFilter) {
super(noContext, extensionDecoderFilter);
}
@Override
public boolean acceptInboundMessage(Object msg) throws Exception {
if (!super.acceptInboundMessage(msg)) {
return false;
}
WebSocketFrame wsFrame = (WebSocketFrame) msg;
if (extensionDecoderFilter().mustSkip(wsFrame)) {
return false;
}
return (msg instanceof TextWebSocketFrame || msg instanceof BinaryWebSocketFrame ||
msg instanceof ContinuationWebSocketFrame) &&
(wsFrame.rsv() & WebSocketExtension.RSV1) > 0;
}
@Override
protected int newRsv(WebSocketFrame msg) {
return msg.rsv() ^ WebSocketExtension.RSV1;
}
@Override
protected boolean appendFrameTail(WebSocketFrame msg) {
return true;
}
}