writting lpPacket...

src/main/java/component/LpPacketFragmentId.java

@@ -0,0 +1,102 @@
+package component;
+
+import encoding.*;
+
+/*
+ * @Author: Wang Feng
+ * @Description: 表示 LpPacket 中的分片id TLV
+ * @Version: 1.0.0
+ * @Date: 20:45 2021/4/5
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+public class LpPacketFragmentId implements TlvComponentBase,InitialAble,IEncodingAble{
+    // 成员变量
+    private long id;
+
+    // 函数
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+        this.doInitial();
+    }
+
+    // 接口实现-变量区
+    private boolean initial=false;
+
+    // 接口实现-方法区
+    @Override
+    public void doInitial() {
+        initial=true;
+    }
+
+    @Override
+    public boolean isInitial() {
+        return initial;
+    }
+
+    /**
+     * 将 LpPacketFragmentId 线速编码为一个 TLV
+     * @param encoder
+     * @return
+     */
+    @Override
+    public int wireEncode(Encoder encoder) throws ComponentException {
+        try {
+            int totalLength=0;
+
+            // 编码 TLV-VALUE
+            int tmpLen=encoder.prependNonNegativeInteger(this.id);
+            if(tmpLen<=0){
+                return -1;
+            }
+            totalLength+=tmpLen;
+
+            // 编码 TLV-TYPE
+            tmpLen=encoder.prependVarNumber(new VlInt(totalLength));
+            if(tmpLen<=0){
+                return -1;
+            }
+            totalLength+=tmpLen;
+
+            // 编码 TLV-TYPE
+            tmpLen=encoder.prependVarNumber(new VlInt(TLV.TlvLpPacketFragmentId));
+            if(tmpLen<=0){
+                return -1;
+            }
+            totalLength+=tmpLen;
+
+            return totalLength;
+        } catch (EncoderException e) {
+            throw new ComponentException("LpPacketFragmentId.wireEncode: "+e.getMessage());
+        }
+    }
+
+    /**
+     * 从 TLV Block 中解码一个 LpPacketFragmentId
+     * @param block
+     * @return
+     */
+    @Override
+    public boolean wireDecode(Block block) throws ComponentException {
+        try {
+            // 检查 Type 是否正确
+            if (!TLV.expectType(block.getType(), new VlInt(TLV.TlvLpPacketFragmentId))) {
+                return false;
+            }
+
+            // 读取 value
+            long value = TLV.readNonNegativeInteger(block.getValue(), 0, block.getLength().getVlIntValue2Int());
+            if (value < 0) {
+                return false;
+            }
+            this.setId(value);
+
+            return true;
+        } catch (TLVException | VlIntException e) {
+            throw new ComponentException("LpPacketFragmentId.wireDecode: "+e.getMessage());
+        }
+    }
+}