core: fix enum fields name after obfuscation (fix #51)

jadx-core/src/main/java/jadx/core/codegen/ClassGen.java

@@ -127,9 +127,9 @@ public class ClassGen {
 					.remove(AccessFlags.ACC_STATIC);
 		}
 
-		// 'static' modifier not allowed for top classes (not inner)
+		// 'static' and 'private' modifier not allowed for top classes (not inner)
 		if (!cls.getAlias().isInner()) {
-			af = af.remove(AccessFlags.ACC_STATIC);
+			af = af.remove(AccessFlags.ACC_STATIC).remove(AccessFlags.ACC_PRIVATE);
 		}
 
 		annotationGen.addForClass(clsCode);
@@ -370,7 +370,7 @@ public class ClassGen {
 		InsnGen igen = null;
 		for (Iterator<EnumField> it = enumFields.getFields().iterator(); it.hasNext(); ) {
 			EnumField f = it.next();
-			code.startLine(f.getName());
+			code.startLine(f.getField().getAlias());
 			ConstructorInsn constrInsn = f.getConstrInsn();
 			if (constrInsn.getArgsCount() > f.getStartArg()) {
 				if (igen == null) {
@@ -393,6 +393,9 @@ public class ClassGen {
 				code.startLine();
 			}
 			code.add(';');
+			if (isFieldsPresents()) {
+				code.startLine();
+			}
 		}
 	}
 

jadx-core/src/main/java/jadx/core/dex/attributes/nodes/EnumClassAttr.java

@@ -2,6 +2,7 @@ package jadx.core.dex.attributes.nodes;
 
 import jadx.core.dex.attributes.AType;
 import jadx.core.dex.attributes.IAttribute;
+import jadx.core.dex.info.FieldInfo;
 import jadx.core.dex.instructions.mods.ConstructorInsn;
 import jadx.core.dex.nodes.ClassNode;
 import jadx.core.dex.nodes.MethodNode;
@@ -12,19 +13,19 @@ import java.util.List;
 public class EnumClassAttr implements IAttribute {
 
 	public static class EnumField {
-		private final String name;
+		private final FieldInfo field;
 		private final ConstructorInsn constrInsn;
 		private final int startArg;
 		private ClassNode cls;
 
-		public EnumField(String name, ConstructorInsn co, int startArg) {
-			this.name = name;
+		public EnumField(FieldInfo field, ConstructorInsn co, int startArg) {
+			this.field = field;
 			this.constrInsn = co;
 			this.startArg = startArg;
 		}
 
-		public String getName() {
-			return name;
+		public FieldInfo getField() {
+			return field;
 		}
 
 		public ConstructorInsn getConstrInsn() {
@@ -45,7 +46,7 @@ public class EnumClassAttr implements IAttribute {
 
 		@Override
 		public String toString() {
-			return name + "(" + constrInsn + ") " + cls;
+			return field + "(" + constrInsn + ") " + cls;
 		}
 	}
 

jadx-core/src/main/java/jadx/core/dex/visitors/EnumVisitor.java

 package jadx.core.dex.visitors;
 
 import jadx.core.codegen.TypeGen;
+import jadx.core.deobf.NameMapper;
 import jadx.core.dex.attributes.AFlag;
 import jadx.core.dex.attributes.nodes.EnumClassAttr;
 import jadx.core.dex.attributes.nodes.EnumClassAttr.EnumField;
@@ -138,12 +139,18 @@ public class EnumVisitor extends AbstractVisitor {
 			if (!clsInfo.equals(classInfo) && !constrCls.getAccessFlags().isEnum()) {
 				continue;
 			}
+			FieldInfo fieldInfo = (FieldInfo) ((IndexInsnNode) putInsn).getIndex();
 			String name = getConstString(cls.dex(), co.getArg(0));
-			if (name == null) {
-				throw new JadxException("Unknown enum field name: " + cls);
+			if (name != null
+					&& !fieldInfo.getAlias().equals(name)
+					&& NameMapper.isValidIdentifier(name)) {
+				// LOG.debug("Rename enum field: '{}' to '{}' in {}", fieldInfo.getName(), name, cls);
+				fieldInfo.setAlias(name);
 			}
-			EnumField field = new EnumField(name, co, 2);
+
+			EnumField field = new EnumField(fieldInfo, co, 2);
 			attr.getFields().add(field);
+
 			if (!co.getClassType().equals(classInfo)) {
 				// enum contains additional methods
 				for (ClassNode innerCls : cls.getInnerClasses()) {