d0b5fb9548
Motivation: The _0XFF_0X00 buffer is not duplicated and empty after the first usage preventing the connection close to happen on subsequent close frames. Modifications: Correctly duplicate the buffer. Result: Multiple CloseWebSocketFrames are handled correctly.
102 lines
3.8 KiB
Java
102 lines
3.8 KiB
Java
/*
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* Copyright 2012 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;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.Unpooled;
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import io.netty.channel.ChannelHandler.Sharable;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.MessageToMessageEncoder;
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import java.util.List;
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/**
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* Encodes a {@link WebSocketFrame} into a {@link ByteBuf}.
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* <p>
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* For the detailed instruction on adding add Web Socket support to your HTTP server, take a look into the
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* <tt>WebSocketServer</tt> example located in the {@code io.netty.example.http.websocket} package.
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*/
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@Sharable
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public class WebSocket00FrameEncoder extends MessageToMessageEncoder<WebSocketFrame> implements WebSocketFrameEncoder {
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private static final ByteBuf _0X00 = Unpooled.unreleasableBuffer(
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Unpooled.directBuffer(1, 1).writeByte((byte) 0x00));
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private static final ByteBuf _0XFF = Unpooled.unreleasableBuffer(
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Unpooled.directBuffer(1, 1).writeByte((byte) 0xFF));
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private static final ByteBuf _0XFF_0X00 = Unpooled.unreleasableBuffer(
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Unpooled.directBuffer(2, 2).writeByte((byte) 0xFF).writeByte((byte) 0x00));
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@Override
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protected void encode(ChannelHandlerContext ctx, WebSocketFrame msg, List<Object> out) throws Exception {
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if (msg instanceof TextWebSocketFrame) {
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// Text frame
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ByteBuf data = msg.content();
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out.add(_0X00.duplicate());
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out.add(data.retain());
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out.add(_0XFF.duplicate());
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} else if (msg instanceof CloseWebSocketFrame) {
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// Close frame, needs to call duplicate to allow multiple writes.
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// See https://github.com/netty/netty/issues/2768
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out.add(_0XFF_0X00.duplicate());
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} else {
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// Binary frame
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ByteBuf data = msg.content();
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int dataLen = data.readableBytes();
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ByteBuf buf = ctx.alloc().buffer(5);
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boolean release = true;
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try {
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// Encode type.
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buf.writeByte((byte) 0x80);
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// Encode length.
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int b1 = dataLen >>> 28 & 0x7F;
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int b2 = dataLen >>> 14 & 0x7F;
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int b3 = dataLen >>> 7 & 0x7F;
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int b4 = dataLen & 0x7F;
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if (b1 == 0) {
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if (b2 == 0) {
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if (b3 == 0) {
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buf.writeByte(b4);
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} else {
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buf.writeByte(b3 | 0x80);
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buf.writeByte(b4);
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}
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} else {
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buf.writeByte(b2 | 0x80);
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buf.writeByte(b3 | 0x80);
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buf.writeByte(b4);
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}
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} else {
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buf.writeByte(b1 | 0x80);
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buf.writeByte(b2 | 0x80);
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buf.writeByte(b3 | 0x80);
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buf.writeByte(b4);
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}
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// Encode binary data.
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out.add(buf);
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out.add(data.retain());
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release = false;
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} finally {
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if (release) {
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buf.release();
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}
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}
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}
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}
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}
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