~wjc/HDLPhotovoltaicDebugAPP.git

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			package com.hdl.sdk.link.core.protocol;


			import com.hdl.sdk.link.common.utils.LogUtils;
			import com.hdl.sdk.link.common.event.EventDispatcher;
			import com.hdl.sdk.link.common.utils.ByteUtils;
			import com.hdl.sdk.link.core.bean.LinkPacket;
			import com.hdl.sdk.link.core.bean.LinkResponse;
			import com.hdl.sdk.link.core.utils.ByteBufferUtils;
			import com.hdl.sdk.link.core.utils.QueueUtils;
			import com.hdl.sdk.link.gateway.HDLLinkLocalGateway;
			import com.hdl.sdk.link.socket.bean.Packet;
			import com.hdl.sdk.link.socket.codec.ByteToMessageDecoder;

			import java.nio.ByteBuffer;

			/**
			* Created by Tong on 2021/9/22.
			* link协议粘包拆包
			*/
			public class LinkMessageDecoder extends ByteToMessageDecoder<LinkResponse> {

			private static final String TAG=LinkMessageDecoder.class.getName();
			//instance
			private volatile static LinkMessageDecoder instance;

			//getInstance
			public static synchronized LinkMessageDecoder getInstance() {
			if (instance == null) {
			synchronized (LinkMessageDecoder.class) {
			if (instance == null) {
			instance = new LinkMessageDecoder();
			}
			}
			}
			return instance;
			}

			/**
			* 接收数据缓冲区
			*/
			private final ByteBuffer byteBuffer;

			private final byte[] head = "Topic:".getBytes();

			public LinkMessageDecoder() {
			byteBuffer = ByteBuffer.allocate(1024 * 200);//100K
			}

			/// <summary>
			/// 获取内容长度
			/// </summary>
			/// <param name="topMsgs"></param>
			/// <returns></returns>
			int getLenght(String[] topMsgs) {
			try {
			for (int i = 0; i < topMsgs.length; i++) {
			String topMsg = topMsgs[i].trim();
			if (topMsg.startsWith("Length:")) {
			return Integer.parseInt(topMsg.replace("Length:", "").trim());
			}
			}
			} catch (Exception e) {
			LogUtils.e("异常数据：" + topMsgs[0] + "\r\n" + topMsgs[1]);
			return -1;
			}
			//找不到长度
			return -1;
			}

			/// <summary>
			/// 获取主题
			/// </summary>
			/// <param name="topMsgs"></param>
			/// <returns></returns>
			private String getTopic(String[] topMsgs) {
			for (int i = 0; i < topMsgs.length; i++) {
			String topMsg = topMsgs[i].trim();
			if (topMsg.startsWith("Topic:")) {
			return topMsg.replace("Topic:", "");
			}
			}
			//找不到主题
			return null;
			}

			/**
			* 获取数据的开始位置
			*
			* @return 数据位的开始索引
			*/
			int getBodyIndex() {
			byte r = (byte) '\r';
			byte n = (byte) '\n';
			for (int i = 0; i < byteBuffer.position(); i++) {
			//找出数据内容前面的两个换行
			if (3 <= i && byteBuffer.get(i - 3) == r && byteBuffer.get(i - 2) == n && byteBuffer.get(i - 1) == r && byteBuffer.get(i) == n) {
			//剩余的数据
			return i + 1;
			}
			}
			return -1;
			}

			/**
			* 获取头部数据
			*
			* @return
			*/
			String getHeader() {
			int bodyIndex = getBodyIndex();
			if (bodyIndex < 0) {
			//没有找到头部数据
			return null;
			} else {
			byte bodyBytes[] = ByteBufferUtils.copyBytes(byteBuffer, bodyIndex);
			return new String(bodyBytes);
			}
			}

			/**
			* 获取数据内容
			*
			* @param lenght
			* @return
			*/
			byte[] getBody(int index, int lenght) {
			//是否已经获取完整所有的数据
			byte[] bodyBytes = new byte[lenght];
			if (index < 0 \|\| byteBuffer.position() < index + lenght) {
			//当前数据还没有接收完成
			return null;
			}

			for (int i = 0; i < bodyBytes.length; i++) {
			bodyBytes[i] = byteBuffer.get(index + i);
			}
			return bodyBytes;
			}


			/**
			* 这边处理了缓存数据粘包的情况，每次请求都需要吧当前完整的文件除去以便于下次的返回
			* tempList用于存储多余的数据
			* contentList用于本次数据的存储（发送给订阅的数据）
			*/
			byte[] geBody() {
			int len = 3 + 4 + 4 + ((byteBuffer.get(7) & 0xFF) * 256 * 256 * 256) + ((byteBuffer.get(8) & 0xFF) * 256 * 256) + ((byteBuffer.get(9) * 256) & 0xFF) + (byteBuffer.get(10) & 0xFf);
			byte[] bodyBytes = new byte[len];
			for (int i = 0; i < len; i++) {
			bodyBytes[i] = byteBuffer.get(i);
			}

			int endIndex = byteBuffer.position();
			byteBuffer.clear();
			for (int i = len; i < endIndex; i++) {
			byteBuffer.put(byteBuffer.get(i));
			}
			return bodyBytes;
			}

			/**
			* 移除可能存在的无效数据
			*/
			void removeInVoidBytes() {
			int index = 0;
			boolean isMatch = false;
			for (; index < byteBuffer.position() - head.length; index++) {
			isMatch = true;
			for (int j = 0, k = 0; j < head.length; j++, k++) {
			if (head[j] != byteBuffer.get(index + k)) {
			isMatch = false;
			break;
			}
			}
			if (isMatch) {
			break;
			}
			}

			if (0 < index && isMatch) {
			int endIndex = byteBuffer.position();
			byteBuffer.clear();
			for (int i = index; i < endIndex; i++) {
			byteBuffer.put(byteBuffer.get(i));
			}
			}
			}

			/**
			* 移除到指定位置前面的数据
			*
			* @param position 指定位置
			*/
			void remove(int position) {
			int endIndex = byteBuffer.position();
			byteBuffer.clear();
			for (int i = position; i < endIndex; i++) {
			byteBuffer.put(byteBuffer.get(i));
			}
			}

			void fileManger(int commandAck, byte[] recevieBytes) {
			String topic = "65531_" + commandAck;
			LinkResponse response = new LinkResponse();
			response.setTopic(topic);
			response.setByteData(recevieBytes);
			EventDispatcher.getInstance().post(response.getTopic(), response);
			}

			int bytes2int(byte[] bytes) {
			int result = 0;
			if (bytes.length == 2) {
			int c = (bytes[0] & 0xff) << 8;
			int d = (bytes[1] & 0xff);
			result = c \| d;
			} else if (bytes.length == 4) {
			return bytes[3] & 0xFF \| //
			(bytes[2] & 0xFF) << 8 \| //
			(bytes[1] & 0xFF) << 16 \| //
			(bytes[0] & 0xFF) << 24; //
			}
			return result;
			}

			public String byte2hex(byte[] bytes) {
			StringBuilder sb = new StringBuilder();
			String tmp = null;
			for (byte b : bytes) {
			//将每个字节与0xFF进行与运算，然后转化为10进制，然后借助于Integer再转化为16进制
			tmp = Integer.toHexString(0xFF & b);
			if (tmp.length() == 1) {
			tmp = "0" + tmp;
			}
			sb.append(tmp + " ");
			}
			return sb.toString();
			}

			@Override
			protected synchronized LinkResponse decoder(Packet packet) {
			try {
			if (null == packet) {
			return null;
			}
			byteBuffer.put(packet.getBytes());
			} catch (Exception e) {
			LogUtils.e("接收到数据异常:\r\n" + e.getMessage());
			byteBuffer.flip();
			byteBuffer.clear();
			}
			try {
			//如果多条命令打包在一条数据中，都需要处理完
			while (true) {
			if (byteBuffer.position() > 2) {//判断是否是文件处理通知 wxr
			byte[] topBytes = new byte[3];
			topBytes[0] = byteBuffer.get(0);
			topBytes[1] = byteBuffer.get(1);
			topBytes[2] = byteBuffer.get(2);
			if (new String(topBytes).equals("hex")) {
			//TODO 这块代码统一移出其它地方处理
			byte[] commandBytes = ByteBufferUtils.copyBytes(byteBuffer, 5, 2);
			int command = bytes2int(commandBytes);
			byte[] submitBytes = geBody();
			if (command == 258 \|\| command == 260 \|\| command == 261) {
			//读取驱动列表响应 \|\|驱动安装申请响应
			if (submitBytes.length > 11) {
			byte[] rangeBytes = ByteUtils.copyBytes(submitBytes, 11, submitBytes.length - 11);
			fileManger(command, rangeBytes);
			} else {
			//方便问题排查
			fileManger(command, submitBytes);
			}
			} else {
			//给秀桡使用后面的业务最好都在这边处理不然会造成业务分散
			fileManger(command, submitBytes);
			}
			continue;
			}
			}
			removeInVoidBytes();//移除可能存在的无效数据

			//头部数据
			String header = getHeader();

			if (header == null) {
			break;
			}
			String[] topMsgs = header.split("\r\n");

			String topic = getTopic(topMsgs);
			int lenght = getLenght(topMsgs);
			if (topic == null \|\| lenght <= 0) {
			//获取不到主题或者头部数据还没有接收完成
			break;
			}

			int bodyIndex = getBodyIndex();
			//是否已经获取完整所有的数据
			byte[] body = getBody(bodyIndex, lenght);

			if (body == null) {
			//当前数据还没有接收完成
			break;
			}

			remove(bodyIndex + lenght);

			if (topic.contains("heartbeat_reply")) {
			if (packet.getSocket() != null) {
			packet.getSocket().setSoTimeout(10 * 1000);
			}
			continue;
			}

			QueueUtils.getInstance().add(new LinkPacket(topic, body));
			}
			} catch (Exception ee) {
			LogUtils.e("处理接收的数据异常:\r\n" + ee.getMessage());
			}
			return null;
			}
			}