| /* |
| * Copyright (C) 2020 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.net.module.util; |
| |
| |
| import android.annotation.Nullable; |
| |
| import java.net.Inet6Address; |
| import java.net.InetAddress; |
| |
| /** |
| * Various utilities used in connectivity code. |
| * @hide |
| */ |
| public final class ConnectivityUtils { |
| private ConnectivityUtils() {} |
| |
| |
| /** |
| * Return IP address and port in a string format. |
| */ |
| public static String addressAndPortToString(InetAddress address, int port) { |
| return String.format( |
| (address instanceof Inet6Address) ? "[%s]:%d" : "%s:%d", |
| address.getHostAddress(), port); |
| } |
| |
| /** |
| * Return true if the provided address is non-null and an IPv6 Unique Local Address (RFC4193). |
| */ |
| public static boolean isIPv6ULA(@Nullable InetAddress addr) { |
| return addr instanceof Inet6Address |
| && ((addr.getAddress()[0] & 0xfe) == 0xfc); |
| } |
| |
| /** |
| * Returns the {@code int} nearest in value to {@code value}. |
| * |
| * @param value any {@code long} value |
| * @return the same value cast to {@code int} if it is in the range of the {@code int} |
| * type, {@link Integer#MAX_VALUE} if it is too large, or {@link Integer#MIN_VALUE} if |
| * it is too small |
| */ |
| public static int saturatedCast(long value) { |
| if (value > Integer.MAX_VALUE) { |
| return Integer.MAX_VALUE; |
| } |
| if (value < Integer.MIN_VALUE) { |
| return Integer.MIN_VALUE; |
| } |
| return (int) value; |
| } |
| } |