feat: de-dupe attribute names during styles writing (#3404)

Author: iBotPeaches

brut.apktool/apktool-lib/src/main/java/brut/androlib/res/data/value/ResStyleValue.java

@@ -24,6 +24,8 @@
 import org.xmlpull.v1.XmlSerializer;
 
 import java.io.IOException;
+import java.util.HashSet;
+import java.util.Set;
 import java.util.logging.Logger;
 
 public class ResStyleValue extends ResBagValue implements ResValuesXmlSerializable {
@@ -47,6 +49,8 @@ public void serializeToResValuesXml(XmlSerializer serializer,
         } else if (res.getResSpec().getName().indexOf('.') != -1) {
             serializer.attribute(null, "parent", "");
         }
+
+        Set<String> processedNames = new HashSet<>();
         for (Duo<ResReferenceValue, ResScalarValue> mItem : mItems) {
             ResResSpec spec = mItem.m1.getReferent();
 
@@ -70,6 +74,11 @@ public void serializeToResValuesXml(XmlSerializer serializer,
                 name = "@" + spec.getFullName(res.getResSpec().getPackage(), false);
             }
 
+            // #3400 - Skip duplicate values, commonly seen are duplicate key-pairs on styles.
+            if (!isAnalysisMode() && processedNames.contains(name)) {
+                continue;
+            }
+
             if (value == null) {
                 value = mItem.m2.encodeAsResXmlValue();
             }
@@ -82,8 +91,11 @@ public void serializeToResValuesXml(XmlSerializer serializer,
             serializer.attribute(null, "name", name);
             serializer.text(value);
             serializer.endTag(null, "item");
+
+            processedNames.add(name);
         }
         serializer.endTag(null, "style");
+        processedNames.clear();
     }
 
     private final Duo<ResReferenceValue, ResScalarValue>[] mItems;

brut.apktool/apktool-lib/src/main/java/brut/androlib/res/data/value/ResValue.java

@@ -22,4 +22,8 @@ public class ResValue {
     public boolean shouldRemoveUnknownRes() {
         return Config.getInstance().isDecodeResolveModeRemoving();
     }
+
+    public boolean isAnalysisMode() {
+        return Config.getInstance().analysisMode;
+    }
 }