lduchosal / ipnetwork / 960

Committed 15 May 2026 07:18AM UTC coverage: 0.0% (-94.1%) from 94.053%

Build # 960

Build Type

Pull #411

appveyor

Committed by

web-flow

Commit Message

Merge ef6b054ce into 4cec191ae

Pull Request Pull Request #411: Bump MSTest.TestFramework from 4.2.2 to 4.2.3

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/src/System.Net.IPNetwork/IPNetwork2ToNetmask.cs

// <copyright file="IPNetwork2ToNetmask.cs" company="IPNetwork">
// Copyright (c) IPNetwork. All rights reserved.
// </copyright>

namespace System.Net;

using System.Diagnostics.CodeAnalysis;
using System.Net.Sockets;
using System.Numerics;

/// <summary>
/// ToNetmask.
/// </summary>
public sealed partial class IPNetwork2
{
    /// <summary>
    /// Convert CIDR to netmask
    ///  24 -> 255.255.255.0
    ///  16 -> 255.255.0.0
    ///  8 -> 255.0.0.0.
    /// </summary>
    /// <see href="http://snipplr.com/view/15557/cidr-class-for-ipv4/"/>
    /// <param name="cidr">A byte representing the netmask in cidr format (/24).</param>
    /// <param name="family">Either IPv4 or IPv6.</param>
    /// <returns>An IPAddress representing cidr.</returns>
    public static IPAddress ToNetmask(byte cidr, AddressFamily family)
    {
        if (!InternalToNetmask(false, cidr, family, out IPAddress? netmask))
        {
            throw new ArgumentException("Invalid CIDR.", nameof(cidr));
        }

        return netmask;
    }

    /// <summary>
    /// Convert CIDR to netmask
    ///  24 -> 255.255.255.0
    ///  16 -> 255.255.0.0
    ///  8 -> 255.0.0.0.
    /// </summary>
    /// <see href="http://snipplr.com/view/15557/cidr-class-for-ipv4/"/>
    /// <param name="cidr">A byte representing the netmask in cidr format (/24).</param>
    /// <param name="family">Either IPv4 or IPv6.</param>
    /// <param name="netmask">The resulting netmask.</param>
    /// <returns>true if cidr was converted successfully; otherwise, false.</returns>
    public static bool TryToNetmask(byte cidr, AddressFamily family, [NotNullWhen(true)] out IPAddress? netmask)
    {
        return InternalToNetmask(true, cidr, family, out netmask);
    }

    /// <summary>
    /// Converts a CIDR value to its corresponding IPAddress netmask.
    /// </summary>
    /// <param name="tryParse">If true, handles errors silently; otherwise, throws exceptions.</param>
    /// <param name="cidr">The CIDR value to convert.</param>
    /// <param name="family">The address family (IPv4 or IPv6).</param>
    /// <param name="netmask">The resulting IPAddress netmask.</param>
    internal static bool InternalToNetmask(bool tryParse, byte cidr, AddressFamily family, [NotNullWhen(true)] out IPAddress? netmask)
    {
        if (family != AddressFamily.InterNetwork
            && family != AddressFamily.InterNetworkV6)
        {
            if (!tryParse)
            {
                throw new ArgumentException("Invalid address family.", nameof(family));
            }

            netmask = null;
            return false;
        }

        int maxCidr = family == AddressFamily.InterNetwork ? 32 : 128;
        if (cidr > maxCidr)
        {
            if (!tryParse)
            {
                throw new ArgumentOutOfRangeException(nameof(cidr));
            }

            netmask = null;
            return false;
        }

        BigInteger mask = ToUint(cidr, family);
        netmask = ToIPAddress(mask, family);
        return true;
    }
}

1	// <copyright file="IPNetwork2ToNetmask.cs" company="IPNetwork">
2	// Copyright (c) IPNetwork. All rights reserved.
3	// </copyright>
4
5	namespace System.Net;
6
7	using System.Diagnostics.CodeAnalysis;
8	using System.Net.Sockets;
9	using System.Numerics;
10
11	/// <summary>
12	/// ToNetmask.
13	/// </summary>
14	public sealed partial class IPNetwork2
15	{
16	/// <summary>
17	/// Convert CIDR to netmask
18	/// 24 -> 255.255.255.0
19	/// 16 -> 255.255.0.0
20	/// 8 -> 255.0.0.0.
21	/// </summary>
22	/// <see href="http://snipplr.com/view/15557/cidr-class-for-ipv4/"/>
23	/// <param name="cidr">A byte representing the netmask in cidr format (/24).</param>
24	/// <param name="family">Either IPv4 or IPv6.</param>
25	/// <returns>An IPAddress representing cidr.</returns>
26	public static IPAddress ToNetmask(byte cidr, AddressFamily family)
27	{	×
28	if (!InternalToNetmask(false, cidr, family, out IPAddress? netmask))	×
29	{	×
30	throw new ArgumentException("Invalid CIDR.", nameof(cidr));	×
31	}
32
33	return netmask;	×
34	}	×
35
36	/// <summary>
37	/// Convert CIDR to netmask
38	/// 24 -> 255.255.255.0
39	/// 16 -> 255.255.0.0
40	/// 8 -> 255.0.0.0.
41	/// </summary>
42	/// <see href="http://snipplr.com/view/15557/cidr-class-for-ipv4/"/>
43	/// <param name="cidr">A byte representing the netmask in cidr format (/24).</param>
44	/// <param name="family">Either IPv4 or IPv6.</param>
45	/// <param name="netmask">The resulting netmask.</param>
46	/// <returns>true if cidr was converted successfully; otherwise, false.</returns>
47	public static bool TryToNetmask(byte cidr, AddressFamily family, [NotNullWhen(true)] out IPAddress? netmask)
48	{	×
49	return InternalToNetmask(true, cidr, family, out netmask);	×
50	}	×
51
52	/// <summary>
53	/// Converts a CIDR value to its corresponding IPAddress netmask.
54	/// </summary>
55	/// <param name="tryParse">If true, handles errors silently; otherwise, throws exceptions.</param>
56	/// <param name="cidr">The CIDR value to convert.</param>
57	/// <param name="family">The address family (IPv4 or IPv6).</param>
58	/// <param name="netmask">The resulting IPAddress netmask.</param>
59	internal static bool InternalToNetmask(bool tryParse, byte cidr, AddressFamily family, [NotNullWhen(true)] out IPAddress? netmask)
60	{	×
61	if (family != AddressFamily.InterNetwork	×
62	&& family != AddressFamily.InterNetworkV6)	×
63	{	×
64	if (!tryParse)	×
65	{	×
66	throw new ArgumentException("Invalid address family.", nameof(family));	×
67	}
68
69	netmask = null;	×
70	return false;	×
71	}
72
73	int maxCidr = family == AddressFamily.InterNetwork ? 32 : 128;	×
74	if (cidr > maxCidr)	×
75	{	×
76	if (!tryParse)	×
77	{	×
78	throw new ArgumentOutOfRangeException(nameof(cidr));	×
79	}
80
81	netmask = null;	×
82	return false;	×
83	}
84
85	BigInteger mask = ToUint(cidr, family);	×
86	netmask = ToIPAddress(mask, family);	×
87	return true;	×
88	}	×
89	}

lduchosal / ipnetwork / 960

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