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16 package org.jboss.netty.handler.codec.http.websocket;
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18 import org.jboss.netty.buffer.ChannelBuffer;
19 import org.jboss.netty.channel.Channel;
20 import org.jboss.netty.channel.ChannelHandlerContext;
21 import org.jboss.netty.channel.ChannelHandler.Sharable;
22 import org.jboss.netty.handler.codec.oneone.OneToOneEncoder;
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39 @Sharable
40 public class WebSocketFrameEncoder extends OneToOneEncoder {
41
42 @Override
43 protected Object encode(ChannelHandlerContext ctx, Channel channel, Object msg) throws Exception {
44 if (msg instanceof WebSocketFrame) {
45 WebSocketFrame frame = (WebSocketFrame) msg;
46 int type = frame.getType();
47 if (frame.isText()) {
48
49 ChannelBuffer data = frame.getBinaryData();
50 ChannelBuffer encoded =
51 channel.getConfig().getBufferFactory().getBuffer(
52 data.order(), data.readableBytes() + 2);
53 encoded.writeByte((byte) type);
54 encoded.writeBytes(data, data.readerIndex(), data.readableBytes());
55 encoded.writeByte((byte) 0xFF);
56 return encoded;
57 } else {
58
59 ChannelBuffer data = frame.getBinaryData();
60 int dataLen = data.readableBytes();
61 ChannelBuffer encoded =
62 channel.getConfig().getBufferFactory().getBuffer(
63 data.order(), dataLen + 5);
64
65
66 encoded.writeByte((byte) type);
67
68
69 int b1 = dataLen >>> 28 & 0x7F;
70 int b2 = dataLen >>> 14 & 0x7F;
71 int b3 = dataLen >>> 7 & 0x7F;
72 int b4 = dataLen & 0x7F;
73 if (b1 == 0) {
74 if (b2 == 0) {
75 if (b3 == 0) {
76 encoded.writeByte(b4);
77 } else {
78 encoded.writeByte(b3 | 0x80);
79 encoded.writeByte(b4);
80 }
81 } else {
82 encoded.writeByte(b2 | 0x80);
83 encoded.writeByte(b3 | 0x80);
84 encoded.writeByte(b4);
85 }
86 } else {
87 encoded.writeByte(b1 | 0x80);
88 encoded.writeByte(b2 | 0x80);
89 encoded.writeByte(b3 | 0x80);
90 encoded.writeByte(b4);
91 }
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94 encoded.writeBytes(data, data.readerIndex(), dataLen);
95 return encoded;
96 }
97 }
98 return msg;
99 }
100 }