76 lines
2.7 KiB
Java
76 lines
2.7 KiB
Java
/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.http.websocketx.extensions.compression;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.ContinuationWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.WebSocketFrame;
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import io.netty.handler.codec.http.websocketx.extensions.WebSocketExtension;
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import java.util.List;
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/**
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* Per-message implementation of deflate compressor.
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*/
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class PerMessageDeflateEncoder extends DeflateEncoder {
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private boolean compressing;
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/**
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* Constructor
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* @param compressionLevel compression level of the compressor.
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* @param windowSize maximum size of the window compressor buffer.
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* @param noContext true to disable context takeover.
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*/
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PerMessageDeflateEncoder(int compressionLevel, int windowSize, boolean noContext) {
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super(compressionLevel, windowSize, noContext);
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}
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@Override
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public boolean acceptOutboundMessage(Object msg) throws Exception {
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return ((msg instanceof TextWebSocketFrame ||
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msg instanceof BinaryWebSocketFrame) &&
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(((WebSocketFrame) msg).rsv() & WebSocketExtension.RSV1) == 0) ||
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(msg instanceof ContinuationWebSocketFrame && compressing);
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}
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@Override
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protected int rsv(WebSocketFrame msg) {
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return msg instanceof TextWebSocketFrame || msg instanceof BinaryWebSocketFrame ?
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msg.rsv() | WebSocketExtension.RSV1 : msg.rsv();
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}
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@Override
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protected boolean removeFrameTail(WebSocketFrame msg) {
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return msg.isFinalFragment();
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}
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@Override
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protected void encode(ChannelHandlerContext ctx, WebSocketFrame msg,
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List<Object> out) throws Exception {
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super.encode(ctx, msg, out);
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if (msg.isFinalFragment()) {
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compressing = false;
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} else if (msg instanceof TextWebSocketFrame || msg instanceof BinaryWebSocketFrame) {
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compressing = true;
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}
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}
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}
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