Only check for xml flags when we know there are any

Test: Automation
Fixes: 377974898
Fixes: 398541237
Fixes: 398086579
Fixes: 396884481
Fixes: 396992602
Flag: android.content.res.layout_readwrite_flags
Change-Id: Ibdabb27689a95eba7b53490ea8651c947beca226

8 files changed, 134 insertions, 9 deletions

diff --git a/libs/androidfw/AssetManager2.cpp b/libs/androidfw/AssetManager2.cpp
index e09ab5fd1643..6caae4c7623e 100644
--- a/libs/androidfw/AssetManager2.cpp
+++ b/libs/androidfw/AssetManager2.cpp
@@ -82,6 +82,9 @@ struct FindEntryResult {
   // The bitmask of configuration axis with which the resource value varies.
   uint32_t type_flags;
 
+  // The bitmask of ResTable_entry flags
+  uint16_t entry_flags;
+
   // The dynamic package ID map for the package from which this resource came from.
   const DynamicRefTable* dynamic_ref_table;
 
@@ -1031,6 +1034,7 @@ base::expected<FindEntryResult, NullOrIOError> AssetManager2::FindEntryInternal(
     .entry = *entry,
     .config = *best_config,
     .type_flags = type_flags,
+    .entry_flags = (*best_entry_verified)->flags(),
     .dynamic_ref_table = package_group.dynamic_ref_table.get(),
     .package_name = &best_package->GetPackageName(),
     .type_string_ref = StringPoolRef(best_package->GetTypeStringPool(), best_type->id - 1),
@@ -1185,16 +1189,16 @@ base::expected<AssetManager2::SelectedValue, NullOrIOError> AssetManager2::GetRe
     }
 
     // Create a reference since we can't represent this complex type as a Res_value.
-    return SelectedValue(Res_value::TYPE_REFERENCE, resid, result->cookie, result->type_flags,
-                         resid, result->config);
+    return SelectedValue(Res_value::TYPE_REFERENCE, resid, result->cookie, result->entry_flags,
+                         result->type_flags, resid, result->config);
   }
 
   // Convert the package ID to the runtime assigned package ID.
   Res_value value = std::get<Res_value>(result->entry);
   result->dynamic_ref_table->lookupResourceValue(&value);
 
-  return SelectedValue(value.dataType, value.data, result->cookie, result->type_flags,
-                       resid, result->config);
+  return SelectedValue(value.dataType, value.data, result->cookie, result->entry_flags,
+                       result->type_flags, resid, result->config);
 }
 
 base::expected<std::monostate, NullOrIOError> AssetManager2::ResolveReference(
@@ -1847,8 +1851,8 @@ std::optional<AssetManager2::SelectedValue> Theme::GetAttribute(uint32_t resid)
     }
 
     return AssetManager2::SelectedValue(entry_it->value.dataType, entry_it->value.data,
-                                        entry_it->cookie, type_spec_flags, 0U /* resid */,
-                                        {} /* config */);
+                                        entry_it->cookie, 0U /* entry flags*/, type_spec_flags,
+                                        0U /* resid */, {} /* config */);
   }
   return std::nullopt;
 }
diff --git a/libs/androidfw/include/androidfw/AssetManager2.h b/libs/androidfw/include/androidfw/AssetManager2.h
index b0179524f6cd..ffcef944a6ba 100644
--- a/libs/androidfw/include/androidfw/AssetManager2.h
+++ b/libs/androidfw/include/androidfw/AssetManager2.h
@@ -257,6 +257,7 @@ class AssetManager2 {
         : cookie(entry.cookie),
           data(entry.value.data),
           type(entry.value.dataType),
+          entry_flags(0U),
           flags(bag->type_spec_flags),
           resid(0U),
           config() {
@@ -271,6 +272,9 @@ class AssetManager2 {
     // Type of the data value.
     uint8_t type;
 
+    // The bitmask of ResTable_entry flags
+    uint16_t entry_flags;
+
     // The bitmask of configuration axis that this resource varies with.
     // See ResTable_config::CONFIG_*.
     uint32_t flags;
@@ -283,9 +287,10 @@ class AssetManager2 {
 
    private:
     SelectedValue(uint8_t value_type, Res_value::data_type value_data, ApkAssetsCookie cookie,
-                  uint32_t type_flags, uint32_t resid, ResTable_config config) :
-                  cookie(cookie), data(value_data), type(value_type), flags(type_flags),
-                  resid(resid), config(std::move(config)) {}
+                  uint16_t entry_flags, uint32_t type_flags, uint32_t resid, ResTable_config config)
+        :
+                  cookie(cookie), data(value_data), type(value_type), entry_flags(entry_flags),
+                  flags(type_flags), resid(resid), config(std::move(config)) {}
   };
 
   // Retrieves the best matching resource value with ID `resid`.
diff --git a/libs/androidfw/tests/AssetManager2_test.cpp b/libs/androidfw/tests/AssetManager2_test.cpp
index 3f228841f6ba..948437230ecc 100644
--- a/libs/androidfw/tests/AssetManager2_test.cpp
+++ b/libs/androidfw/tests/AssetManager2_test.cpp
@@ -23,6 +23,7 @@
 #include "androidfw/ResourceUtils.h"
 #include "data/appaslib/R.h"
 #include "data/basic/R.h"
+#include "data/flagged/R.h"
 #include "data/lib_one/R.h"
 #include "data/lib_two/R.h"
 #include "data/libclient/R.h"
@@ -32,6 +33,7 @@
 namespace app = com::android::app;
 namespace appaslib = com::android::appaslib::app;
 namespace basic = com::android::basic;
+namespace flagged = com::android::flagged;
 namespace lib_one = com::android::lib_one;
 namespace lib_two = com::android::lib_two;
 namespace libclient = com::android::libclient;
@@ -87,6 +89,10 @@ class AssetManager2Test : public ::testing::Test {
 
     overlayable_assets_ = ApkAssets::Load("overlayable/overlayable.apk");
     ASSERT_THAT(overlayable_assets_, NotNull());
+
+    flagged_assets_ = ApkAssets::Load("flagged/flagged.apk");
+    ASSERT_THAT(app_assets_, NotNull());
+
     chdir(original_path.c_str());
   }
 
@@ -104,6 +110,7 @@ class AssetManager2Test : public ::testing::Test {
   AssetManager2::ApkAssetsPtr app_assets_;
   AssetManager2::ApkAssetsPtr overlay_assets_;
   AssetManager2::ApkAssetsPtr overlayable_assets_;
+  AssetManager2::ApkAssetsPtr flagged_assets_;
 };
 
 TEST_F(AssetManager2Test, FindsResourceFromSingleApkAssets) {
@@ -856,4 +863,12 @@ TEST_F(AssetManager2Test, GetApkAssets) {
   EXPECT_EQ(1, lib_one_assets_->getStrongCount());
 }
 
+TEST_F(AssetManager2Test, GetFlaggedAssets) {
+  AssetManager2 assetmanager;
+  assetmanager.SetApkAssets({flagged_assets_});
+  auto value = assetmanager.GetResource(flagged::R::xml::flagged, false, 0);
+  ASSERT_TRUE(value.has_value());
+  EXPECT_TRUE(value->entry_flags & ResTable_entry::FLAG_USES_FEATURE_FLAGS);
+}
+
 }  // namespace android
diff --git a/libs/androidfw/tests/data/flagged/AndroidManifest.xml b/libs/androidfw/tests/data/flagged/AndroidManifest.xml
new file mode 100644
index 000000000000..cc1394328797
--- /dev/null
+++ b/libs/androidfw/tests/data/flagged/AndroidManifest.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2025 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.basic">
+    <application />
+</manifest>
diff --git a/libs/androidfw/tests/data/flagged/R.h b/libs/androidfw/tests/data/flagged/R.h
new file mode 100644
index 000000000000..33ccab28cdd3
--- /dev/null
+++ b/libs/androidfw/tests/data/flagged/R.h
@@ -0,0 +1,35 @@
+/*
+* Copyright (C) 2025 The Android Open Source Project
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#pragma once
+
+#include <cstdint>
+
+namespace com {
+namespace android {
+namespace flagged {
+
+struct R {
+  struct xml {
+    enum : uint32_t {
+      flagged = 0x7f010000,
+    };
+  };
+};
+
+}  // namespace flagged
+}  // namespace android
+}  // namespace com
\ No newline at end of file
diff --git a/libs/androidfw/tests/data/flagged/build b/libs/androidfw/tests/data/flagged/build
new file mode 100755
index 000000000000..9e5d21ba1833
--- /dev/null
+++ b/libs/androidfw/tests/data/flagged/build
@@ -0,0 +1,28 @@
+#!/bin/bash
+#
+# Copyright (C) 2025 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+set -e
+
+PATH_TO_FRAMEWORK_RES=${ANDROID_BUILD_TOP}/prebuilts/sdk/current/public/android.jar
+
+aapt2 compile --dir res -o compiled.flata
+aapt2 link -o flagged.apk \
+    --manifest AndroidManifest.xml \
+    -I $PATH_TO_FRAMEWORK_RES \
+    -I ../basic/basic.apk \
+    compiled.flata
+rm compiled.flata
diff --git a/libs/androidfw/tests/data/flagged/flagged.apk b/libs/androidfw/tests/data/flagged/flagged.apk
new file mode 100644
index 000000000000..94b8f4d9fcf0
--- /dev/null
+++ b/libs/androidfw/tests/data/flagged/flagged.apk
diff --git a/libs/androidfw/tests/data/flagged/res/xml/flagged.xml b/libs/androidfw/tests/data/flagged/res/xml/flagged.xml
new file mode 100644
index 000000000000..5fe8d1b3ac27
--- /dev/null
+++ b/libs/androidfw/tests/data/flagged/res/xml/flagged.xml
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2025 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<first  xmlns:android="http://schemas.android.com/apk/res/android">
+    <second android:featureFlag="android.content.res.always_false"/>
+</first>
\ No newline at end of file