Introduce nt-fwk

Used by Hotword Enrollment.

Change-Id: I65f5da0ba6dcd2e83a6bbc5a14567474686beedc
Signed-off-by: cjh1249131356 <cjh1249131356@gmail.com>
Signed-off-by: chandu078 <chandudyavanapelli03@gmail.com>

nt-fwk/Android.bp

@@ -0,0 +1,14 @@
+//
+// Copyright (C) 2024 The LineageOS Project
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+java_library {
+    name: "nt-fwk",
+    installable: true,
+
+    srcs: [
+        "src/**/*.java",
+    ],
+}

nt-fwk/nt-fwk.mk

@@ -0,0 +1,8 @@
+#
+# Copyright (C) 2024 The LineageOS Project
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+PRODUCT_PACKAGES += nt-fwk
+PRODUCT_BOOT_JARS += nt-fwk

nt-fwk/src/com/nothing/NtFeaturesUtils.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2024 The LineageOS Project
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package com.nothing;
+
+import android.os.Build;
+import android.os.SystemProperties;
+
+import java.util.BitSet;
+
+public class NtFeaturesUtils {
+
+    private static final BitSet sFeatures = new BitSet(38);
+
+    static {
+        final String fullProp = SystemProperties.get("ro.build.nothing.feature.base", "0");
+        final String productDiffProp = SystemProperties.get("ro.build.nothing.feature.diff.product." + Build.PRODUCT, "0");
+        final String deviceDiffProp = SystemProperties.get("ro.build.nothing.feature.diff.device." + Build.DEVICE, "0");
+
+        base(Long.decode(fullProp).longValue());
+        change(Long.decode(productDiffProp).longValue());
+        change(Long.decode(deviceDiffProp).longValue());
+    }
+
+    public static boolean isSupport(int... features) {
+        for (int feature : features) {
+            if (feature < 0 || feature > 37) {
+                return false;
+            }
+            if (!sFeatures.get(feature)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    private static void base(long full) {
+        int index = 0;
+        while (full != 0) {
+            if (full % 2 != 0) {
+                sFeatures.set(index);
+            }
+            index++;
+            full >>>= 1;
+        }
+    }
+
+    private static void change(long diff) {
+        int index = 0;
+        while (diff != 0) {
+            if (diff % 2 != 0) {
+                sFeatures.flip(index);
+            }
+            index++;
+            diff >>>= 1;
+        }
+    }
+}