Add built-in hosts

app/src/main/java/com/hippo/ehviewer/Hosts.java

@@ -142,7 +142,7 @@ public class Hosts {
   }
 
   @Nullable
-  private static InetAddress toInetAddress(String host, String ip) {
+  public static InetAddress toInetAddress(String host, String ip) {
     if (!isValidHost(host)) {
       return null;
     }

app/src/main/java/com/hippo/ehviewer/Settings.java

@@ -952,6 +952,17 @@ public class Settings {
         return getIntFromStr(KEY_READ_CACHE_SIZE, DEFAULT_READ_CACHE_SIZE);
     }
 
+    public static final String KEY_BUILT_IN_HOSTS = "built_in_hosts";
+    private static final boolean DEFAULT_BUILT_IN_HOSTS = false;
+
+    public static boolean getBuiltInHosts() {
+        return getBoolean(KEY_BUILT_IN_HOSTS, DEFAULT_BUILT_IN_HOSTS);
+    }
+
+    public static void putBuiltInHosts(boolean value) {
+        putBoolean(KEY_BUILT_IN_HOSTS, value);
+    }
+
     /********************
      ****** Guide
      ********************/

app/src/main/java/com/hippo/ehviewer/client/EhDns.java

@@ -23,15 +23,34 @@ package com.hippo.ehviewer.client;
 import android.content.Context;
 import com.hippo.ehviewer.EhApplication;
 import com.hippo.ehviewer.Hosts;
+import com.hippo.ehviewer.Settings;
 import java.net.InetAddress;
 import java.net.UnknownHostException;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 import okhttp3.Dns;
 
 public class EhDns implements Dns {
 
+  private static final Map<String, InetAddress> builtInHosts;
+
+  static {
+    Map<String, InetAddress> map = new HashMap<>();
+    put(map, "e-hentai.org", "104.24.255.11");
+    put(map, "forums.e-hentai.org", "94.100.18.243");
+    builtInHosts = map;
+  }
+
+  private static void put(Map<String, InetAddress> map, String host, String ip) {
+    InetAddress address = Hosts.toInetAddress(host, ip);
+    if (address != null) {
+      map.put(host, address);
+    }
+  }
+
   private final Hosts hosts;
 
   public EhDns(Context context) {
@@ -47,6 +66,13 @@ public class EhDns implements Dns {
       return Collections.singletonList(inetAddress);
     }
 
+    if (Settings.getBuiltInHosts()) {
+      inetAddress = builtInHosts.get(hostname);
+      if (inetAddress != null) {
+        return Collections.singletonList(inetAddress);
+      }
+    }
+
     try {
       return Arrays.asList(InetAddress.getAllByName(hostname));
     } catch (NullPointerException e) {