lduchosal / ipnetwork / 881

Committed 07 Mar 2026 04:55PM UTC coverage: 92.371% (-1.0%) from 93.419%

Build # 881

Build Type

Pull #383

appveyor

Committed by

web-flow

Commit Message

Merge 72bf930e1 into 4178c9692

Pull Request Pull Request #383: feat/v4-nullable

Coverage Stats

1901 of 2058 relevant lines covered (92.37%)

580908.3 hits per line

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92.31

/src/System.Net.IPNetwork/CidrClassFull.cs

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

namespace System.Net;

using System.Net.Sockets;

/// <summary>
/// Class <c>CidrClassFull</c> tries to guess CIDR in a ClassFull way.
/// </summary>
public sealed class CidrClassFull : ICidrGuess
{
    /// <summary>
    ///
    /// IPV4 :
    ///
    /// Class              Leading bits    Default netmask
    ///     A (CIDR /8)        00           255.0.0.0
    ///     A (CIDR /8)        01           255.0.0.0
    ///     B (CIDR /16)       10           255.255.0.0
    ///     C (CIDR /24)       11           255.255.255.0
    ///
    /// IPV6 : 64.
    ///
    /// </summary>
    /// <param name="ip">A string representing the CIDR to convert.</param>
    /// <param name="cidr">A byte representing the netmask in cidr format (/24).</param>
    /// <returns>true if ip was converted successfully; otherwise, false.</returns>
    public bool TryGuessCidr(string? ip, out byte cidr)
    {
        if (!IPAddress.TryParse($"{ip}", out var ipaddress))
        {
            cidr = 0;
            return false;
        }

        if (ipaddress.AddressFamily == AddressFamily.InterNetworkV6)
        {
            cidr = 64;
            return true;
        }

        var uintIPAddress = IPNetwork2.ToBigInteger(ipaddress);
        uintIPAddress >>= 30;
        if (uintIPAddress <= 1)
        {
            cidr = 8;
            return true;
        }

        if (uintIPAddress <= 2)
        {
            cidr = 16;
            return true;
        }

        if (uintIPAddress <= 3)
        {
            cidr = 24;
            return true;
        }

        cidr = 0;
        return false;
    }
}

1	// <copyright file="CidrClassFull.cs" company="IPNetwork">
2	// Copyright (c) IPNetwork. All rights reserved.
3	// </copyright>
4
5	namespace System.Net;
6
7	using System.Net.Sockets;
8
9	/// <summary>
10	/// Class <c>CidrClassFull</c> tries to guess CIDR in a ClassFull way.
11	/// </summary>
12	public sealed class CidrClassFull : ICidrGuess
13	{
14	/// <summary>
15	///
16	/// IPV4 :
17	///
18	/// Class Leading bits Default netmask
19	/// A (CIDR /8) 00 255.0.0.0
20	/// A (CIDR /8) 01 255.0.0.0
21	/// B (CIDR /16) 10 255.255.0.0
22	/// C (CIDR /24) 11 255.255.255.0
23	///
24	/// IPV6 : 64.
25	///
26	/// </summary>
27	/// <param name="ip">A string representing the CIDR to convert.</param>
28	/// <param name="cidr">A byte representing the netmask in cidr format (/24).</param>
29	/// <returns>true if ip was converted successfully; otherwise, false.</returns>
30	public bool TryGuessCidr(string? ip, out byte cidr)
31	{	62✔
32	if (!IPAddress.TryParse($"{ip}", out var ipaddress))	62✔
33	{	9✔
34	cidr = 0;	9✔
35	return false;	9✔
36	}
37
38	if (ipaddress.AddressFamily == AddressFamily.InterNetworkV6)	53✔
39	{	21✔
40	cidr = 64;	21✔
41	return true;	21✔
42	}
43
44	var uintIPAddress = IPNetwork2.ToBigInteger(ipaddress);	32✔
45	uintIPAddress >>= 30;	32✔
46	if (uintIPAddress <= 1)	32✔
47	{	12✔
48	cidr = 8;	12✔
49	return true;	12✔
50	}
51
52	if (uintIPAddress <= 2)	20✔
53	{	4✔
54	cidr = 16;	4✔
55	return true;	4✔
56	}
57
58	if (uintIPAddress <= 3)	16✔
59	{	16✔
60	cidr = 24;	16✔
61	return true;	16✔
62	}
63
64	cidr = 0;	×
65	return false;	×
66	}	62✔
67	}

lduchosal / ipnetwork / 881

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