42c65cca3a
- Move common methods from ByteBuf to Buf - Rename ensureWritableBytes() to ensureWritable() - Rename readable() to isReadable() - Rename writable() to isWritable() - Add isReadable(int) and isWritable(int) - Add AbstractMessageBuf - Rewrite DefaultMessageBuf and QueueBackedMessageBuf - based on Josh Bloch's public domain ArrayDeque impl
92 lines
3.1 KiB
Java
92 lines
3.1 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.channel.ChannelHandler.Sharable;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.MessageToByteEncoder;
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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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* @apiviz.landmark
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* @apiviz.uses io.netty.handler.codec.http.websocket.WebSocketFrame
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*/
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@Sharable
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public class WebSocket00FrameEncoder extends MessageToByteEncoder<WebSocketFrame> {
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public WebSocket00FrameEncoder() {
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super(WebSocketFrame.class);
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}
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@Override
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public void encode(
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ChannelHandlerContext ctx,
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WebSocketFrame msg, ByteBuf out) throws Exception {
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if (msg instanceof TextWebSocketFrame) {
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// Text frame
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ByteBuf data = msg.data();
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out.writeByte((byte) 0x00);
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out.writeBytes(data, data.readerIndex(), data.readableBytes());
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out.writeByte((byte) 0xFF);
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} else if (msg instanceof CloseWebSocketFrame) {
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// Close frame
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out.writeByte((byte) 0xFF);
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out.writeByte((byte) 0x00);
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} else {
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// Binary frame
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ByteBuf data = msg.data();
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int dataLen = data.readableBytes();
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out.ensureWritable(dataLen + 5);
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// Encode type.
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out.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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out.writeByte(b4);
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} else {
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out.writeByte(b3 | 0x80);
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out.writeByte(b4);
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}
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} else {
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out.writeByte(b2 | 0x80);
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out.writeByte(b3 | 0x80);
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out.writeByte(b4);
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}
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} else {
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out.writeByte(b1 | 0x80);
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out.writeByte(b2 | 0x80);
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out.writeByte(b3 | 0x80);
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out.writeByte(b4);
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}
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// Encode binary data.
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out.writeBytes(data, data.readerIndex(), dataLen);
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}
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}
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}
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