Android: Convert NetworkHelper to Kotlin

2 files changed, 84 insertions, 127 deletions

diff --git a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/utils/NetworkHelper.java b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/utils/NetworkHelper.java
deleted file mode 100644
index 380abc949e..0000000000
--- a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/utils/NetworkHelper.java
+++ /dev/null
@@ -1,127 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-package org.dolphinemu.dolphinemu.utils;
-
-import android.app.Service;
-import android.content.Context;
-import android.net.ConnectivityManager;
-import android.net.LinkAddress;
-import android.net.LinkProperties;
-import android.net.Network;
-import android.net.RouteInfo;
-import android.os.Build;
-
-import androidx.annotation.Keep;
-import androidx.annotation.RequiresApi;
-
-import org.dolphinemu.dolphinemu.DolphinApplication;
-
-import java.net.Inet4Address;
-import java.net.InetAddress;
-import java.net.UnknownHostException;
-
-public class NetworkHelper
-{
-  private static ConnectivityManager GetConnectivityManager()
-  {
-    Context context = DolphinApplication.getAppContext();
-    ConnectivityManager manager =
-            (ConnectivityManager) context.getSystemService(Service.CONNECTIVITY_SERVICE);
-    if (manager == null)
-      Log.warning("Cannot get Network link as ConnectivityManager is null.");
-    return manager;
-  }
-
-  @RequiresApi(api = Build.VERSION_CODES.M)
-  private static LinkAddress GetIPv4Link()
-  {
-    ConnectivityManager manager = GetConnectivityManager();
-    if (manager == null)
-      return null;
-    Network active_network = manager.getActiveNetwork();
-    if (active_network == null)
-    {
-      Log.warning("Active network is null.");
-      return null;
-    }
-    LinkProperties properties = manager.getLinkProperties(active_network);
-    if (properties == null)
-    {
-      Log.warning("Link properties is null.");
-      return null;
-    }
-    for (LinkAddress link : properties.getLinkAddresses())
-    {
-      InetAddress address = link.getAddress();
-      if (address instanceof Inet4Address)
-        return link;
-    }
-    Log.warning("No IPv4 link found.");
-    return null;
-  }
-
-  private static int InetAddressToInt(InetAddress address)
-  {
-    byte[] net_addr = address.getAddress();
-    int result = 0;
-    // Convert address to little endian
-    for (int i = 0; i < net_addr.length; i++)
-    {
-      result |= (net_addr[i] & 0xFF) << (8 * i);
-    }
-    return result;
-  }
-
-  @Keep
-  public static int GetNetworkIpAddress()
-  {
-    if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.M)
-      return 0;
-    LinkAddress link = GetIPv4Link();
-    if (link == null)
-      return 0;
-    return InetAddressToInt(link.getAddress());
-  }
-
-  @Keep
-  public static int GetNetworkPrefixLength()
-  {
-    if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.M)
-      return 0;
-    LinkAddress link = GetIPv4Link();
-    if (link == null)
-      return 0;
-    return link.getPrefixLength();
-  }
-
-  @Keep
-  public static int GetNetworkGateway()
-  {
-    if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.M)
-      return 0;
-    ConnectivityManager manager = GetConnectivityManager();
-    if (manager == null)
-      return 0;
-    Network active_network = manager.getActiveNetwork();
-    if (active_network == null)
-      return 0;
-    LinkProperties properties = manager.getLinkProperties(active_network);
-    if (properties == null)
-      return 0;
-    try
-    {
-      InetAddress addr_out = InetAddress.getByName("8.8.8.8");
-      for (RouteInfo route : properties.getRoutes())
-      {
-        if (!route.matches(addr_out))
-          continue;
-        return InetAddressToInt(route.getGateway());
-      }
-    }
-    catch (UnknownHostException ignore)
-    {
-    }
-    Log.warning("No valid gateway found.");
-    return 0;
-  }
-}
diff --git a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/utils/NetworkHelper.kt b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/utils/NetworkHelper.kt
new file mode 100644
index 0000000000..1b3140bf10
--- /dev/null
+++ b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/utils/NetworkHelper.kt
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package org.dolphinemu.dolphinemu.utils
+
+import android.content.Context
+import android.net.ConnectivityManager
+import android.net.LinkAddress
+import android.os.Build
+import androidx.annotation.Keep
+import androidx.annotation.RequiresApi
+import org.dolphinemu.dolphinemu.DolphinApplication
+import java.net.Inet4Address
+import java.net.InetAddress
+import java.net.UnknownHostException
+
+@Keep
+object NetworkHelper {
+    private fun getConnectivityManager(): ConnectivityManager? {
+        val context = DolphinApplication.getAppContext()
+        val manager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as? ConnectivityManager
+        if (manager == null) {
+            Log.warning("Cannot get network link as ConnectivityManager is null.")
+        }
+        return manager
+    }
+
+    @RequiresApi(Build.VERSION_CODES.M)
+    private fun getIPv4Link(): LinkAddress? {
+        val manager = getConnectivityManager() ?: return null
+        val activeNetwork = manager.activeNetwork
+        if (activeNetwork == null) {
+            Log.warning("Active network is null.")
+            return null
+        }
+        val properties = manager.getLinkProperties(activeNetwork)
+        if (properties == null) {
+            Log.warning("Link properties is null.")
+            return null
+        }
+        return properties.linkAddresses.firstOrNull { it.address is Inet4Address } ?: run {
+            Log.warning("No IPv4 link found.")
+            null
+        }
+    }
+
+    private fun InetAddress.inetAddressToInt(): Int {
+        return address.foldIndexed(0) { index, acc, byte ->
+            acc or ((byte.toInt() and 0xFF) shl (8 * index))
+        }
+    }
+
+    @Keep
+    @JvmStatic
+    fun getNetworkIpAddress(): Int {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) return 0
+        return getIPv4Link()?.address?.inetAddressToInt() ?: 0
+    }
+
+    @Keep
+    @JvmStatic
+    fun getNetworkPrefixLength(): Int {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) return 0
+        return getIPv4Link()?.prefixLength ?: 0
+    }
+
+    @Keep
+    @JvmStatic
+    fun getNetworkGateway(): Int {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) return 0
+        val manager = getConnectivityManager() ?: return 0
+        val activeNetwork = manager.activeNetwork ?: return 0
+        val properties = manager.getLinkProperties(activeNetwork) ?: return 0
+        val gatewayAddress = try {
+            val target = InetAddress.getByName("8.8.8.8")
+            properties.routes.firstOrNull { it.matches(target) }?.gateway
+        } catch (ignored: UnknownHostException) {
+            null
+        }
+        return gatewayAddress?.inetAddressToInt() ?: run {
+            Log.warning("No valid gateway found.")
+            0
+        }
+    }
+}