Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Permissions / EnvironmentPermission.cs / 1 / 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; [Flags,Serializable] [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")); } public EnvironmentPermission( EnvironmentPermissionAccess flag, String pathList ) { SetPathList( flag, pathList ); } 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 ); } 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(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Arg_EnumIllegalVal"), (int)flag)); } 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") ); } } 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 // //----------------------------------------------------- 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( String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_WrongType"), this.GetType().FullName) ); } } public override IPermission Intersect(IPermission target) { if (target == null) { return null; } else if (!VerifyType(target)) { throw new ArgumentException( String.Format(CultureInfo.CurrentCulture, 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; } public override IPermission Union(IPermission other) { if (other == null) { return this.Copy(); } else if (!VerifyType(other)) { throw new ArgumentException( String.Format(CultureInfo.CurrentCulture, 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; } 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; } 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 ); } } ///int IBuiltInPermission.GetTokenIndex() { return EnvironmentPermission.GetTokenIndex(); } internal static int GetTokenIndex() { return BuiltInPermissionIndex.EnvironmentPermissionIndex; } } }
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