EnvironmentPermission.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Security / Permissions / EnvironmentPermission.cs / 1305376 / EnvironmentPermission.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
//  EnvironmentPermission.cs
// 
// [....] 
//
 
namespace System.Security.Permissions {
    using System.Security;
    using System;
    using SecurityElement = System.Security.SecurityElement; 
    using System.Security.Util;
    using System.IO; 
    using System.Globalization; 
    using System.Diagnostics.Contracts;
 
    [Serializable]
    [Flags]
    [System.Runtime.InteropServices.ComVisible(true)]
    public enum EnvironmentPermissionAccess 
    {
        NoAccess = 0x00, 
        Read = 0x01, 
        Write = 0x02,
        AllAccess = 0x03, 
    }

    [Serializable]
    internal class EnvironmentStringExpressionSet : StringExpressionSet 
    {
        public EnvironmentStringExpressionSet() 
            : base( true, null, false ) 
        {
        } 

        public EnvironmentStringExpressionSet( String str )
            : base( true, str, false )
        { 
        }
 
        protected override StringExpressionSet CreateNewEmpty() 
        {
            return new EnvironmentStringExpressionSet(); 
        }

        protected override bool StringSubsetString( String left, String right, bool ignoreCase )
        { 
            return (ignoreCase?(String.Compare( left, right, StringComparison.OrdinalIgnoreCase) == 0):
                (String.Compare( left, right, StringComparison.Ordinal) == 0)); 
        } 

        protected override String ProcessWholeString( String str ) 
        {
            return str;
        }
 
        protected override String ProcessSingleString( String str )
        { 
            return str; 
        }
    } 

[System.Runtime.InteropServices.ComVisible(true)]
    [Serializable]
    sealed public class EnvironmentPermission : CodeAccessPermission, IUnrestrictedPermission, IBuiltInPermission 
    {
        private StringExpressionSet m_read; 
        private StringExpressionSet m_write; 
        private bool m_unrestricted;
 
        public EnvironmentPermission(PermissionState state)
        {
            if (state == PermissionState.Unrestricted)
                m_unrestricted = true; 
            else if (state == PermissionState.None)
                m_unrestricted = false; 
            else 
                throw new ArgumentException(Environment.GetResourceString("Argument_InvalidPermissionState"));
        } 

        [System.Security.SecuritySafeCritical]  // auto-generated
        public EnvironmentPermission( EnvironmentPermissionAccess flag, String pathList )
        { 
            SetPathList( flag, pathList );
        } 
 
        [System.Security.SecuritySafeCritical]  // auto-generated
        public void SetPathList( EnvironmentPermissionAccess flag, String pathList ) 
        {
            VerifyFlag( flag );

            m_unrestricted = false; 

            if ((flag & EnvironmentPermissionAccess.Read) != 0) 
                m_read = null; 

            if ((flag & EnvironmentPermissionAccess.Write) != 0) 
                m_write = null;

            AddPathList( flag, pathList );
        } 

        [System.Security.SecuritySafeCritical]  // auto-generated 
        public void AddPathList( EnvironmentPermissionAccess flag, String pathList ) 
        {
            VerifyFlag( flag ); 

            if (FlagIsSet( flag, EnvironmentPermissionAccess.Read ))
            {
                if (m_read == null) 
                    m_read = new EnvironmentStringExpressionSet();
                m_read.AddExpressions( pathList ); 
            } 

            if (FlagIsSet( flag, EnvironmentPermissionAccess.Write )) 
            {
                if (m_write == null)
                    m_write = new EnvironmentStringExpressionSet();
                m_write.AddExpressions( pathList ); 
            }
 
        } 

        public String GetPathList( EnvironmentPermissionAccess flag ) 
        {
            VerifyFlag( flag );
            ExclusiveFlag( flag );
 
            if (FlagIsSet( flag, EnvironmentPermissionAccess.Read ))
            { 
                if (m_read == null) 
                {
                    return ""; 
                }
                return m_read.ToString();
            }
 
            if (FlagIsSet( flag, EnvironmentPermissionAccess.Write ))
            { 
                if (m_write == null) 
                {
                    return ""; 
                }
                return m_write.ToString();
            }
 
            /* not reached */
 
            return ""; 
        }
 

        private void VerifyFlag( EnvironmentPermissionAccess flag )
        {
            if ((flag & ~EnvironmentPermissionAccess.AllAccess) != 0) 
                throw new ArgumentException(Environment.GetResourceString("Arg_EnumIllegalVal", (int)flag));
            Contract.EndContractBlock(); 
        } 

        private void ExclusiveFlag( EnvironmentPermissionAccess flag ) 
        {
            if (flag == EnvironmentPermissionAccess.NoAccess)
            {
                throw new ArgumentException( Environment.GetResourceString("Arg_EnumNotSingleFlag") ); 
            }
 
            if (((int)flag & ((int)flag-1)) != 0) 
            {
                throw new ArgumentException( Environment.GetResourceString("Arg_EnumNotSingleFlag") ); 
            }
            Contract.EndContractBlock();
        }
 

        private bool FlagIsSet( EnvironmentPermissionAccess flag, EnvironmentPermissionAccess question ) 
        { 
            return (flag & question) != 0;
        } 

        private bool IsEmpty()
        {
            return (!m_unrestricted && 
                    (this.m_read == null || this.m_read.IsEmpty()) &&
                    (this.m_write == null || this.m_write.IsEmpty())); 
        } 

        //------------------------------------------------------ 
        //
        // CODEACCESSPERMISSION IMPLEMENTATION
        //
        //----------------------------------------------------- 

        public bool IsUnrestricted() 
        { 
            return m_unrestricted;
        } 

        //-----------------------------------------------------
        //
        // IPERMISSION IMPLEMENTATION 
        //
        //----------------------------------------------------- 
 
        [System.Security.SecuritySafeCritical]  // auto-generated
        public override bool IsSubsetOf(IPermission target) 
        {
            if (target == null)
            {
                return this.IsEmpty(); 
            }
 
            try 
            {
                EnvironmentPermission operand = (EnvironmentPermission)target; 
                if (operand.IsUnrestricted())
                    return true;
                else if (this.IsUnrestricted())
                    return false; 
                else
                    return ((this.m_read == null || this.m_read.IsSubsetOf( operand.m_read )) && 
                            (this.m_write == null || this.m_write.IsSubsetOf( operand.m_write ))); 
            }
            catch (InvalidCastException) 
            {
                throw new
                    ArgumentException(
                                    Environment.GetResourceString("Argument_WrongType", this.GetType().FullName) 
                                     );
            } 
        } 

        [System.Security.SecuritySafeCritical]  // auto-generated 
        public override IPermission Intersect(IPermission target)
        {
            if (target == null)
            { 
                return null;
            } 
            else if (!VerifyType(target)) 
            {
                throw new 
                    ArgumentException(
                                    Environment.GetResourceString("Argument_WrongType", this.GetType().FullName)
                                     );
            } 
            else if (this.IsUnrestricted())
            { 
                return target.Copy(); 
            }
 
            EnvironmentPermission operand = (EnvironmentPermission)target;

            if (operand.IsUnrestricted())
            { 
                return this.Copy();
            } 
 
            StringExpressionSet intersectRead = this.m_read == null ? null : this.m_read.Intersect( operand.m_read );
            StringExpressionSet intersectWrite = this.m_write == null ? null : this.m_write.Intersect( operand.m_write ); 

            if ((intersectRead == null || intersectRead.IsEmpty()) &&
                (intersectWrite == null || intersectWrite.IsEmpty()))
            { 
                return null;
            } 
 
            EnvironmentPermission intersectPermission = new EnvironmentPermission(PermissionState.None);
            intersectPermission.m_unrestricted = false; 
            intersectPermission.m_read = intersectRead;
            intersectPermission.m_write = intersectWrite;

            return intersectPermission; 
        }
 
        [System.Security.SecuritySafeCritical]  // auto-generated 
        public override IPermission Union(IPermission other)
        { 
            if (other == null)
            {
                return this.Copy();
            } 
            else if (!VerifyType(other))
            { 
                throw new 
                    ArgumentException(
                                    Environment.GetResourceString("Argument_WrongType", this.GetType().FullName) 
                                     );
            }

            EnvironmentPermission operand = (EnvironmentPermission)other; 

            if (this.IsUnrestricted() || operand.IsUnrestricted()) 
            { 
                return new EnvironmentPermission( PermissionState.Unrestricted );
            } 

            StringExpressionSet unionRead = this.m_read == null ? operand.m_read : this.m_read.Union( operand.m_read );
            StringExpressionSet unionWrite = this.m_write == null ? operand.m_write : this.m_write.Union( operand.m_write );
 
            if ((unionRead == null || unionRead.IsEmpty()) &&
                (unionWrite == null || unionWrite.IsEmpty())) 
            { 
                return null;
            } 

            EnvironmentPermission unionPermission = new EnvironmentPermission(PermissionState.None);
            unionPermission.m_unrestricted = false;
            unionPermission.m_read = unionRead; 
            unionPermission.m_write = unionWrite;
 
            return unionPermission; 
        }
 
        public override IPermission Copy()
        {
            EnvironmentPermission copy = new EnvironmentPermission(PermissionState.None);
            if (this.m_unrestricted) 
            {
                copy.m_unrestricted = true; 
            } 
            else
            { 
                copy.m_unrestricted = false;
                if (this.m_read != null)
                {
                    copy.m_read = this.m_read.Copy(); 
                }
                if (this.m_write != null) 
                { 
                    copy.m_write = this.m_write.Copy();
                } 

            }
            return copy;
        } 

#if FEATURE_CAS_POLICY 
        public override SecurityElement ToXml() 
        {
            SecurityElement esd = CodeAccessPermission.CreatePermissionElement( this, "System.Security.Permissions.EnvironmentPermission" ); 
            if (!IsUnrestricted())
            {
                if (this.m_read != null && !this.m_read.IsEmpty())
                { 
                    esd.AddAttribute( "Read", SecurityElement.Escape( m_read.ToString() ) );
                } 
                if (this.m_write != null && !this.m_write.IsEmpty()) 
                {
                    esd.AddAttribute( "Write", SecurityElement.Escape( m_write.ToString() ) ); 
                }
            }
            else
            { 
                esd.AddAttribute( "Unrestricted", "true" );
            } 
            return esd; 
        }
 
        [System.Security.SecuritySafeCritical]  // auto-generated
        public override void FromXml(SecurityElement esd)
        {
            CodeAccessPermission.ValidateElement( esd, this ); 

            String et; 
 
            if (XMLUtil.IsUnrestricted(esd))
            { 
                m_unrestricted = true;
                return;
            }
 
            m_unrestricted = false;
            m_read = null; 
            m_write = null; 

            et = esd.Attribute( "Read" ); 
            if (et != null)
            {
                m_read = new EnvironmentStringExpressionSet( et );
            } 

            et = esd.Attribute( "Write" ); 
            if (et != null) 
            {
                m_write = new EnvironmentStringExpressionSet( et ); 
            }

        }
#endif // FEATURE_CAS_POLICY 

        ///  
        int IBuiltInPermission.GetTokenIndex() 
        {
            return EnvironmentPermission.GetTokenIndex(); 
        }

        internal static int GetTokenIndex()
        { 
            return BuiltInPermissionIndex.EnvironmentPermissionIndex;
        } 
    } 

} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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EnvironmentPermission.cs source code in C# .NET

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