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/*
* 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;
}
}
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