Merge "Remove unnecessary custom shadow of android.system.Os" into main

import androidx.appcompat.app.AlertDialog;

import com.android.settings.R;

import com.android.settings.testutils.shadow.ShadowOs;

import com.android.settingslib.CustomDialogPreferenceCompat.CustomPreferenceDialogFragment;

import org.junit.Before;

import org.robolectric.RobolectricTestRunner;

import org.robolectric.RuntimeEnvironment;

import org.robolectric.annotation.Config;

import org.robolectric.shadows.ShadowOs;

import org.robolectric.util.ReflectionHelpers;

@RunWith(RobolectricTestRunner.class)

/*

 * Copyright (C) 2018 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.

 */

package com.android.settings.testutils.shadow;

import static android.system.OsConstants.AF_INET;

import static android.system.OsConstants.AF_INET6;

import android.system.Os;

import org.robolectric.annotation.Implementation;

import org.robolectric.annotation.Implements;

import java.net.InetAddress;

import java.net.UnknownHostException;

import java.util.regex.Pattern;

@Implements(Os.class)

public class ShadowOs {

    // These are not actually correct, but good enough for the test

    private static final Pattern IPV4_PATTERN =

        Pattern.compile("^\\d{1,3}(\\.\\d{1,3}){3}$");

    private static final Pattern IPV6_PATTERN =

        Pattern.compile("^[0-9a-f]{1,4}(:[0-9a-f]{0,4}){0,6}$");

    private static final byte[] IPV4_BYTES = new byte[4];

    private static final byte[] IPV6_BYTES = new byte[16];

    @Implementation

    protected static InetAddress inet_pton(int family, String address) {

        if ((AF_INET  == family && IPV4_PATTERN.matcher(address).find()) ||

            (AF_INET6 == family && IPV6_PATTERN.matcher(address).find())) {

            try {

                return InetAddress.getByAddress((AF_INET == family) ? IPV4_BYTES : IPV6_BYTES);

            } catch (UnknownHostException uhe) {

                // Shouldn't be reached.

            }

        }

        return null;

    }

}