avoid throwing EmptyStackExceptions in as2 deobfuscation

libsrc/ffdec_lib/src/com/jpexs/decompiler/graph/GraphSourceItem.java

@@ -25,6 +25,10 @@ public interface GraphSourceItem extends Serializable, Cloneable {
 
     public void translate(BaseLocalData localData, TranslateStack stack, List<GraphTargetItem> output, int staticOperation, String path) throws InterruptedException;
 
+    public int getStackPopCount(BaseLocalData localData, TranslateStack stack);
+
+    public int getStackPushCount(BaseLocalData localData, TranslateStack stack);
+
     public boolean isJump();
 
     public boolean isBranch();

libsrc/ffdec_lib/src/com/jpexs/decompiler/graph/GraphTargetItem.java

@@ -17,6 +17,7 @@
 package com.jpexs.decompiler.graph;
 
 import com.jpexs.decompiler.flash.SourceGeneratorLocalData;
+import com.jpexs.decompiler.flash.action.model.DirectValueActionItem;
 import com.jpexs.decompiler.flash.configuration.Configuration;
 import com.jpexs.decompiler.flash.helpers.GraphTextWriter;
 import com.jpexs.decompiler.flash.helpers.HighlightedTextWriter;
@@ -375,4 +376,15 @@ public abstract class GraphTargetItem implements Serializable, Cloneable {
         writer.endBlock();
         return writer;
     }
+
+    public long getAsLong() {
+        if (this instanceof DirectValueActionItem) {
+            DirectValueActionItem dvai = (DirectValueActionItem) this;
+            if (dvai.value instanceof Long) {
+                return (long) (Long) dvai.value;
+            }
+        }
+
+        return 0;
+    }
 }

libsrc/ffdec_lib/src/com/jpexs/decompiler/graph/TranslateStack.java

@@ -69,6 +69,16 @@ public class TranslateStack extends Stack<GraphTargetItem> {
         return super.peek();
     }
 
+    public synchronized GraphTargetItem peek(int index) {
+        if (path != null) {
+            if (index > this.size()) {
+                Logger.getLogger(TranslateStack.class.getName()).log(Level.FINE, "{0}: Attemp to Peek item from stack", path);
+                return getPop();
+            }
+        }
+        return super.get(size() - index);
+    }
+
     @Override
     public synchronized GraphTargetItem pop() {
         if (path != null) {