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AccessMask.cs
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AccessMask.cs
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// Copyright 2019 Google Inc. All Rights Reserved.
//
// 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:https://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.
using System;
using System.Runtime.InteropServices;
namespace NtApiDotNet
{
/// <summary>
/// Structure for an NT access mask.
/// </summary>
[StructLayout(LayoutKind.Sequential)]
public struct AccessMask : IFormattable, IEquatable<AccessMask>, IComparable<AccessMask>
{
/// <summary>
/// The access mask's access bits.
/// </summary>
public uint Access;
/// <summary>
/// Constructor.
/// </summary>
/// <param name="access">Access bits to use</param>
public AccessMask(uint access)
{
Access = access;
}
/// <summary>
/// Implicit conversion from Int32.
/// </summary>
/// <param name="access">The access enumeration.</param>
public static implicit operator AccessMask(int access)
{
return new AccessMask((uint)access);
}
/// <summary>
/// Implicit conversion from UInt32.
/// </summary>
/// <param name="access">The access enumeration.</param>
public static implicit operator AccessMask(uint access)
{
return new AccessMask(access);
}
/// <summary>
/// Implicit conversion from enumerations.
/// </summary>
/// <param name="access">The access enumeration.</param>
public static implicit operator AccessMask(Enum access)
{
return new AccessMask(((IConvertible)access).ToUInt32(null));
}
/// <summary>
/// Convert access mask to a generic access object.
/// </summary>
/// <returns>The generic access mask</returns>
public GenericAccessRights ToGenericAccess()
{
return (GenericAccessRights)Access;
}
/// <summary>
/// Convert access mask to a mandatory label policy
/// </summary>
/// <returns>The mandatory label policy</returns>
public MandatoryLabelPolicy ToMandatoryLabelPolicy()
{
return (MandatoryLabelPolicy)Access;
}
/// <summary>
/// Convert to a specific access right.
/// </summary>
/// <typeparam name="A">The specific access right.</typeparam>
/// <returns>The converted value.</returns>
public A ToSpecificAccess<A>() where A : Enum
{
return (A)(object)Access;
}
/// <summary>
/// Convert to a specific access right.
/// </summary>
/// <param name="enum_type">The type of enumeration to convert to.</param>
/// <returns>The converted value.</returns>
public Enum ToSpecificAccess(Type enum_type)
{
if (!enum_type.IsEnum)
throw new ArgumentException("Type must be an Enum", "enum_type");
return (Enum)Enum.ToObject(enum_type, Access);
}
/// <summary>
/// Get whether this access mask is empty (i.e. it's 0)
/// </summary>
public bool IsEmpty => Access == 0;
/// <summary>
/// Get whether this access mask has no access rights, i.e. not empty.
/// </summary>
public bool HasAccess => !IsEmpty;
/// <summary>
/// Get whether this access mask has generic access rights.
/// </summary>
public bool HasGenericAccess => (Access & 0xF0000000) != 0;
/// <summary>
/// Get whether this access mask hash type specific access rights.
/// </summary>
public bool HasSpecificAccess => (Access & 0xFFFF) != 0;
/// <summary>
/// Get whether the current access mask is granted specific permissions.
/// </summary>
/// <param name="mask">The access mask to check</param>
/// <returns>True one or more access granted.</returns>
public bool IsAccessGranted(AccessMask mask) => (Access & mask.Access) != 0;
/// <summary>
/// Get whether the current access mask is granted all specific permissions.
/// </summary>
/// <param name="mask">The access mask to check</param>
/// <returns>True access all is granted.</returns>
public bool IsAllAccessGranted(AccessMask mask) => (Access & mask.Access) == mask.Access;
/// <summary>
/// Bitwise AND operator.
/// </summary>
/// <param name="mask1">Access mask 1</param>
/// <param name="mask2">Access mask 2</param>
/// <returns>The new access mask.</returns>
public static AccessMask operator &(AccessMask mask1, AccessMask mask2)
{
return new AccessMask(mask1.Access & mask2.Access);
}
/// <summary>
/// Bitwise OR operator.
/// </summary>
/// <param name="mask1">Access mask 1</param>
/// <param name="mask2">Access mask 2</param>
/// <returns>The new access mask.</returns>
public static AccessMask operator |(AccessMask mask1, AccessMask mask2)
{
return new AccessMask(mask1.Access | mask2.Access);
}
/// <summary>
/// Bitwise AND operator.
/// </summary>
/// <param name="mask1">Access mask 1</param>
/// <param name="mask2">Access mask 2</param>
/// <returns>The new access mask.</returns>
public static AccessMask operator &(AccessMask mask1, uint mask2)
{
return new AccessMask(mask1.Access & mask2);
}
/// <summary>
/// Bitwise OR operator.
/// </summary>
/// <param name="mask1">Access mask 1</param>
/// <param name="mask2">Access mask 2</param>
/// <returns>The new access mask.</returns>
public static AccessMask operator |(AccessMask mask1, uint mask2)
{
return new AccessMask(mask1.Access | mask2);
}
/// <summary>
/// Equality operator.
/// </summary>
/// <param name="mask1">Access mask 1</param>
/// <param name="mask2">Access mask 2</param>
/// <returns>True if equal.</returns>
public static bool operator ==(AccessMask mask1, AccessMask mask2)
{
return mask1.Access == mask2.Access;
}
/// <summary>
/// Inequality operator.
/// </summary>
/// <param name="mask1">Access mask 1</param>
/// <param name="mask2">Access mask 2</param>
/// <returns>True if equal.</returns>
public static bool operator !=(AccessMask mask1, AccessMask mask2)
{
return mask1.Access != mask2.Access;
}
/// <summary>
/// Bitwise NOT operator.
/// </summary>
/// <param name="mask1">Access mask 1</param>
/// <returns>The new access mask.</returns>
public static AccessMask operator ~(AccessMask mask1)
{
return new AccessMask(~mask1.Access);
}
/// <summary>
/// Overridden GetHashCode.
/// </summary>
/// <returns>The hash code.</returns>
public override int GetHashCode()
{
return Access.GetHashCode();
}
/// <summary>
/// Overridden Equals.
/// </summary>
/// <param name="obj">The object to compare against.</param>
/// <returns>True if equal.</returns>
public override bool Equals(object obj)
{
if (!(obj is AccessMask))
{
return false;
}
AccessMask mask = (AccessMask)obj;
return Access == mask.Access;
}
/// <summary>
/// Get an empty access mask.
/// </summary>
public static AccessMask Empty { get { return new AccessMask(); } }
/// <summary>
/// Overridden ToString method.
/// </summary>
/// <returns>The access mask.</returns>
public override string ToString()
{
return ToString("X08");
}
/// <summary>
/// ToString method.
/// </summary>
/// <param name="format">Format code for the access mask.</param>
/// <returns>The formatting string.</returns>
public string ToString(string format)
{
return ToString(format, null);
}
/// <summary>
/// ToString method.
/// </summary>
/// <param name="format">Format code for the access mask.</param>
/// <param name="formatProvider">The format provider.</param>
/// <returns>The formatting string.</returns>
public string ToString(string format, IFormatProvider formatProvider)
{
return Access.ToString(format, formatProvider);
}
bool IEquatable<AccessMask>.Equals(AccessMask other)
{
return Access == other.Access;
}
int IComparable<AccessMask>.CompareTo(AccessMask other)
{
return Access.CompareTo(other.Access);
}
}
}