34 lines
1.3 KiB
Java
34 lines
1.3 KiB
Java
package com.mogo.telematic;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
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public class MogoLengthFrameDecoder extends LengthFieldBasedFrameDecoder {
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public static final int MAX_FRAME_LENGTH = 3 * 1024 * 1024;
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// 参考MogoProtocolMsg结构(https://blog.csdn.net/thinking_fioa/article/details/80573483)
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public static final int LENGTH_FIELD_OFFSET = 4;
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public static final int LENGTH_FIELD_SIZE = 4;
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public MogoLengthFrameDecoder(int maxFrameLength, int lengthFieldOffset, int lengthFieldLength) {
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super(maxFrameLength, lengthFieldOffset, lengthFieldLength);
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}
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@Override
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protected Object decode(ChannelHandlerContext ctx, ByteBuf in) throws Exception {
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ByteBuf byteBuf = (ByteBuf) super.decode(ctx, in);
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if (byteBuf == null) return null;
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MogoProtocolMsg mogoProtocolMsg = new MogoProtocolMsg();
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mogoProtocolMsg.setProtocolType(byteBuf.readInt());
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int length = byteBuf.readInt();
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mogoProtocolMsg.setBodyLength(length);
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if (length > 0) {
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byte[] body = new byte[length];
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byteBuf.readBytes(body);
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mogoProtocolMsg.setBody(body);
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}
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in.release();
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return mogoProtocolMsg;
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}
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} |