tunnel: Codestyle cleanups

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java

@@ -45,7 +45,7 @@ public final class GoBackend implements Backend {
         this.context = context;
     }
 
-    public static void setAlwaysOnCallback(AlwaysOnCallback cb) {
+    public static void setAlwaysOnCallback(final AlwaysOnCallback cb) {
         alwaysOnCallback = cb;
     }
 
@@ -84,7 +84,8 @@ public final class GoBackend implements Backend {
         }
         final String config = wgGetConfig(currentTunnelHandle);
         Key key = null;
-        long rx = 0, tx = 0;
+        long rx = 0;
+        long tx = 0;
         for (final String line : config.split("\\n")) {
             if (line.startsWith("public_key=")) {
                 if (key != null)
@@ -152,7 +153,7 @@ public final class GoBackend implements Backend {
 
     private void setStateInternal(final Tunnel tunnel, @Nullable final Config config, final State state)
             throws Exception {
-        Log.i(TAG, "Bringing tunnel " + tunnel.getName() + " " + state);
+        Log.i(TAG, "Bringing tunnel " + tunnel.getName() + ' ' + state);
 
         if (state == State.UP) {
             if (config == null)

tunnel/src/main/java/com/wireguard/android/backend/WgQuickBackend.java

@@ -105,7 +105,7 @@ public final class WgQuickBackend implements Backend {
         return output.get(0);
     }
 
-    public void setMultipleTunnels(boolean on) {
+    public void setMultipleTunnels(final boolean on) {
         multipleTunnels = on;
     }
 
@@ -164,7 +164,7 @@ public final class WgQuickBackend implements Backend {
     }
 
     private void setStateInternal(final Tunnel tunnel, @Nullable final Config config, final State state) throws Exception {
-        Log.i(TAG, "Bringing tunnel " + tunnel.getName() + " " + state);
+        Log.i(TAG, "Bringing tunnel " + tunnel.getName() + ' ' + state);
 
         Objects.requireNonNull(config, "Trying to set state up with a null config");
 

tunnel/src/main/java/com/wireguard/android/util/ModuleLoader.java

@@ -38,6 +38,7 @@ import java.util.Map;
 import androidx.annotation.Nullable;
 
 @NonNullForAll
+@SuppressWarnings("MagicNumber")
 public class ModuleLoader {
     private static final String MODULE_LIST_URL = "https://download.wireguard.com/android-module/modules.txt.sig";
     private static final String MODULE_NAME = "wireguard-%s.ko";
@@ -70,7 +71,7 @@ public class ModuleLoader {
         connection.connect();
         if (connection.getResponseCode() != HttpURLConnection.HTTP_OK)
             throw new IOException("Hash list could not be found");
-        byte[] input = new byte[1024 * 1024 * 3 /* 3MiB */];
+        final byte[] input = new byte[1024 * 1024 * 3 /* 3MiB */];
         int len;
         try (final InputStream inputStream = connection.getInputStream()) {
             len = inputStream.read(input);
@@ -93,7 +94,7 @@ public class ModuleLoader {
         File tempFile = null;
         try {
             tempFile = File.createTempFile("UNVERIFIED-", null, tmpDir);
-            MessageDigest digest = MessageDigest.getInstance("SHA-256");
+            final MessageDigest digest = MessageDigest.getInstance("SHA-256");
             try (final InputStream inputStream = connection.getInputStream();
                  final FileOutputStream outputStream = new FileOutputStream(tempFile)) {
                 int total = 0;
@@ -127,7 +128,7 @@ public class ModuleLoader {
     }
 
     @Nullable
-    private Map<String, Sha256Digest> verifySignedHashes(final String signifyDigest) {
+    private static Map<String, Sha256Digest> verifySignedHashes(final String signifyDigest) {
         final byte[] publicKeyBytes = Base64.decode(MODULE_PUBLIC_KEY_BASE64, Base64.DEFAULT);
 
         if (publicKeyBytes == null || publicKeyBytes.length != 32 + 10 || publicKeyBytes[0] != 'E' || publicKeyBytes[1] != 'd')
@@ -148,9 +149,9 @@ public class ModuleLoader {
         }
 
         try {
-            EdDSAParameterSpec parameterSpec = EdDSANamedCurveTable.getByName(EdDSANamedCurveTable.ED_25519);
-            Signature signature = new EdDSAEngine(MessageDigest.getInstance(parameterSpec.getHashAlgorithm()));
-            byte[] rawPublicKeyBytes = new byte[32];
+            final EdDSAParameterSpec parameterSpec = EdDSANamedCurveTable.getByName(EdDSANamedCurveTable.ED_25519);
+            final Signature signature = new EdDSAEngine(MessageDigest.getInstance(parameterSpec.getHashAlgorithm()));
+            final byte[] rawPublicKeyBytes = new byte[32];
             System.arraycopy(publicKeyBytes, 10, rawPublicKeyBytes, 0, 32);
             signature.initVerify(new EdDSAPublicKey(new EdDSAPublicKeySpec(rawPublicKeyBytes, parameterSpec)));
             signature.update(lines[2].getBytes(StandardCharsets.UTF_8));
@@ -160,9 +161,9 @@ public class ModuleLoader {
             return null;
         }
 
-        Map<String, Sha256Digest> hashes = new HashMap<>();
+        final Map<String, Sha256Digest> hashes = new HashMap<>();
         for (final String line : lines[2].split("\n")) {
-            final String[] components = line.split("  ", 2);
+            final String[] components = line.split(" {2}", 2);
             if (components.length != 2)
                 return null;
             try {
@@ -175,7 +176,7 @@ public class ModuleLoader {
     }
 
     private static final class Sha256Digest {
-        private byte[] bytes;
+        private final byte[] bytes;
 
         private Sha256Digest(final String hex) {
             if (hex.length() != 64)

tunnel/src/main/java/com/wireguard/android/util/RootShell.java

@@ -177,7 +177,7 @@ public class RootShell {
         }
     }
 
-    public void stop() {
+    private void stop() {
         synchronized (lock) {
             if (process != null) {
                 process.destroy();

tunnel/src/main/java/com/wireguard/android/util/SharedLibraryLoader.java

@@ -37,29 +37,23 @@ public final class SharedLibraryLoader {
 
         for (final String abi : Build.SUPPORTED_ABIS) {
             for (final String apk : apks) {
-                final ZipFile zipFile;
-                try {
-                    zipFile = new ZipFile(new File(apk), ZipFile.OPEN_READ);
-                } catch (final IOException e) {
-                    throw new RuntimeException(e);
-                }
-
-                final String mappedLibName = System.mapLibraryName(libName);
-                final byte[] buffer = new byte[1024 * 32];
-                final String libZipPath = "lib" + File.separatorChar + abi + File.separatorChar + mappedLibName;
-                final ZipEntry zipEntry = zipFile.getEntry(libZipPath);
-                if (zipEntry == null)
-                    continue;
-                Log.d(TAG, "Extracting apk:/" + libZipPath + " to " + destination.getAbsolutePath());
-                try (final FileOutputStream out = new FileOutputStream(destination);
-                     final InputStream in = zipFile.getInputStream(zipEntry)) {
-                    int len;
-                    while ((len = in.read(buffer)) != -1) {
-                        out.write(buffer, 0, len);
+                try (final ZipFile zipFile = new ZipFile(new File(apk), ZipFile.OPEN_READ)) {
+                    final String mappedLibName = System.mapLibraryName(libName);
+                    final String libZipPath = "lib" + File.separatorChar + abi + File.separatorChar + mappedLibName;
+                    final ZipEntry zipEntry = zipFile.getEntry(libZipPath);
+                    if (zipEntry == null)
+                        continue;
+                    Log.d(TAG, "Extracting apk:/" + libZipPath + " to " + destination.getAbsolutePath());
+                    try (final FileOutputStream out = new FileOutputStream(destination);
+                         final InputStream in = zipFile.getInputStream(zipEntry)) {
+                        int len;
+                        final byte[] buffer = new byte[1024 * 32];
+                        while ((len = in.read(buffer)) != -1) {
+                            out.write(buffer, 0, len);
+                        }
+                        out.getFD().sync();
                     }
-                    out.getFD().sync();
                 }
-                zipFile.close();
                 return true;
             }
         }

tunnel/src/main/java/com/wireguard/config/InetNetwork.java

@@ -47,7 +47,7 @@ public final class InetNetwork {
         final int maxMask = (address instanceof Inet4Address) ? 32 : 128;
         if (rawMask > maxMask)
             throw new ParseException(InetNetwork.class, maskString, "Invalid network mask");
-        final int mask = rawMask >= 0 && rawMask <= maxMask ? rawMask : maxMask;
+        final int mask = rawMask >= 0 ? rawMask : maxMask;
         return new InetNetwork(address, mask);
     }