修复bytehelper & VlInt中的已知bug

src/main/java/encoding/Block.java

@@ -1,6 +1,7 @@
 package encoding;
 
 import util.ByteHelper;
+import util.ByteHelperException;
 
 import java.util.LinkedList;
 import java.util.List;
@@ -43,7 +44,12 @@ public class Block {
         }
 
         // 读取length
-        VlInt tlvLength=TLV.readVarNumber(buffer,new VlInt(tlvType.size()));
+        VlInt tlvLength= null;
+        try {
+            tlvLength = TLV.readVarNumber(buffer,new VlInt(tlvType.size()));
+        } catch (ByteHelperException e) {
+            e.printStackTrace();
+        }
         if(tlvLength==null){
             return null;
         }
@@ -197,7 +203,7 @@ public class Block {
      * 	2. 如果TLV的value不为空，且不存在嵌套的子TLV，则会抛出错误
      * @return
      */
-    public boolean parseSubElements(){
+    public boolean parseSubElements() {
         if((this.value.length==0)||this.elements.length()!=0){
             return true;
         }
@@ -213,7 +219,12 @@ public class Block {
             start+=tlvType.size();
 
             // 读取 TLV-LENGTH
-            VlInt tlvLength=TLV.readVarNumber(this.value,new VlInt(start));
+            VlInt tlvLength= null;
+            try {
+                tlvLength = TLV.readVarNumber(this.value,new VlInt(start));
+            } catch (ByteHelperException e) {
+                e.printStackTrace();
+            }
             if(tlvType==null){
                 this.clearElements();
                 return false;
@@ -227,14 +238,19 @@ public class Block {
             }
 
             // 创建一个子 TLV Block 并添加到elements当中
-            byte[] subBlockValue=new byte[tlvLength.getVlIntValue2Int()];
-            System.arraycopy(this.value,start,subBlockValue,0,tlvLength.getVlIntValue2Int());
-            Block block=createBlockByTypeLengthBuffer(tlvType,tlvLength,subBlockValue,true);
-            if(block==null){
-                return false;
+            byte[] subBlockValue= new byte[0];
+            try {
+                subBlockValue = new byte[tlvLength.getVlIntValue2Int()];
+                System.arraycopy(this.value,start,subBlockValue,0,tlvLength.getVlIntValue2Int());
+                Block block=createBlockByTypeLengthBuffer(tlvType,tlvLength,subBlockValue,true);
+                if(block==null){
+                    return false;
+                }
+                this.addElement(block);
+                start+=tlvLength.getVlIntValue2Int();
+            } catch (VlIntException e) {
+                e.printStackTrace();
             }
-            this.addElement(block);
-            start+=tlvLength.getVlIntValue2Int();
         }
         return true;
     }