Jtt1078MessageDecoder.java
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package cn.org.hentai.jtt1078.server;
import cn.org.hentai.jtt1078.util.ByteUtils;
import cn.org.hentai.jtt1078.util.Packet;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.List;
/**
* Created by matrixy on 2019/4/9.
*/
public class Jtt1078MessageDecoder extends ByteToMessageDecoder
{
static Logger logger = LoggerFactory.getLogger(Jtt1078MessageDecoder.class);
byte[] block = new byte[4096];
Jtt1078Decoder decoder = new Jtt1078Decoder();
@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception
{
int length = in.readableBytes();
while (length > 30) {
in.markReaderIndex();
int frameHeader = in.readInt();
if (frameHeader == 0x30316364) {
in.skipBytes(11);
int dataType = (in.readByte() >> 4) & 0xFF, lengthOffset = 28;
// 透传数据类型：0100，没有后面的时间以及Last I Frame Interval和Last Frame Interval字段
if (dataType == 0x04) lengthOffset = 28 - 8 - 2 - 2;
else if (dataType == 0x03) lengthOffset = 28 - 4;
in.skipBytes(lengthOffset - 16);
int bodyLength = in.readShort() & 0xFFFFFFFF;
int packetLength = lengthOffset + bodyLength + 2;
//System.out.println(bodyLength);
if (length < packetLength) {
in.resetReaderIndex();
return;
}
byte[] data = new byte[packetLength];
in.resetReaderIndex();
in.readBytes(data);
Packet packet = Packet.create(data);
out.add(packet);
// System.out.println("start:" + (lengthOffset + 2));
// System.out.println(toHex(data));
} else {
in.resetReaderIndex();
in.readByte();
}
length = in.readableBytes();
}
}
public String toHex(byte[] bytes) {
StringBuilder sb = new StringBuilder();
for (byte b : bytes) {
sb.append(String.format("%02X ", b));
}
return sb.toString();
}
}