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fileiopermission.cs
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fileiopermission.cs
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// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
// FileIOPermission.cs
//
// <OWNER>[....]</OWNER>
//
namespace System.Security.Permissions {
using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
#if FEATURE_CAS_POLICY
using SecurityElement = System.Security.SecurityElement;
#endif // FEATURE_CAS_POLICY
using System.Security.AccessControl;
using System.Security.Util;
using System.IO;
using System.Collections;
using System.Globalization;
using System.Runtime.Serialization;
using System.Runtime.Versioning;
using System.Diagnostics.Contracts;
[Serializable]
[Flags]
[System.Runtime.InteropServices.ComVisible(true)]
public enum FileIOPermissionAccess
{
NoAccess = 0x00,
Read = 0x01,
Write = 0x02,
Append = 0x04,
PathDiscovery = 0x08,
AllAccess = 0x0F,
}
[System.Runtime.InteropServices.ComVisible(true)]
[Serializable]
sealed public class FileIOPermission : CodeAccessPermission, IUnrestrictedPermission, IBuiltInPermission
{
private FileIOAccess m_read;
private FileIOAccess m_write;
private FileIOAccess m_append;
private FileIOAccess m_pathDiscovery;
[OptionalField(VersionAdded = 2)]
private FileIOAccess m_viewAcl;
[OptionalField(VersionAdded = 2)]
private FileIOAccess m_changeAcl;
private bool m_unrestricted;
public FileIOPermission(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 FileIOPermission( FileIOPermissionAccess access, String path )
{
VerifyAccess( access );
String[] pathList = new String[] { path };
AddPathList( access, pathList, false, true, false );
}
[System.Security.SecuritySafeCritical] // auto-generated
public FileIOPermission( FileIOPermissionAccess access, String[] pathList )
{
VerifyAccess( access );
AddPathList( access, pathList, false, true, false );
}
#if FEATURE_MACL
[System.Security.SecuritySafeCritical] // auto-generated
public FileIOPermission( FileIOPermissionAccess access, AccessControlActions control, String path )
{
VerifyAccess( access );
String[] pathList = new String[] { path };
AddPathList( access, control, pathList, false, true, false );
}
[System.Security.SecuritySafeCritical] // auto-generated
public FileIOPermission( FileIOPermissionAccess access, AccessControlActions control, String[] pathList )
: this( access, control, pathList, true, true )
{
}
#endif
[System.Security.SecurityCritical] // auto-generated
internal FileIOPermission( FileIOPermissionAccess access, String[] pathList, bool checkForDuplicates, bool needFullPath )
{
VerifyAccess( access );
AddPathList( access, pathList, checkForDuplicates, needFullPath, true );
}
#if FEATURE_MACL
[System.Security.SecurityCritical] // auto-generated
internal FileIOPermission( FileIOPermissionAccess access, AccessControlActions control, String[] pathList, bool checkForDuplicates, bool needFullPath )
{
VerifyAccess( access );
AddPathList( access, control, pathList, checkForDuplicates, needFullPath, true );
}
#endif
public void SetPathList( FileIOPermissionAccess access, String path )
{
String[] pathList;
if(path == null)
pathList = new String[] {};
else
pathList = new String[] { path };
SetPathList( access, pathList, false );
}
public void SetPathList( FileIOPermissionAccess access, String[] pathList )
{
SetPathList( access, pathList, true );
}
internal void SetPathList( FileIOPermissionAccess access,
String[] pathList, bool checkForDuplicates )
{
SetPathList( access, AccessControlActions.None, pathList, checkForDuplicates );
}
[System.Security.SecuritySafeCritical] // auto-generated
internal void SetPathList( FileIOPermissionAccess access, AccessControlActions control, String[] pathList, bool checkForDuplicates )
{
VerifyAccess( access );
if ((access & FileIOPermissionAccess.Read) != 0)
m_read = null;
if ((access & FileIOPermissionAccess.Write) != 0)
m_write = null;
if ((access & FileIOPermissionAccess.Append) != 0)
m_append = null;
if ((access & FileIOPermissionAccess.PathDiscovery) != 0)
m_pathDiscovery = null;
#if FEATURE_MACL
if ((control & AccessControlActions.View) != 0)
m_viewAcl = null;
if ((control & AccessControlActions.Change) != 0)
m_changeAcl = null;
#else
m_viewAcl = null;
m_changeAcl = null;
#endif
m_unrestricted = false;
#if FEATURE_MACL
AddPathList( access, control, pathList, checkForDuplicates, true, true );
#else
AddPathList( access, pathList, checkForDuplicates, true, true );
#endif
}
[System.Security.SecuritySafeCritical] // auto-generated
public void AddPathList( FileIOPermissionAccess access, String path )
{
String[] pathList;
if(path == null)
pathList = new String[] {};
else
pathList = new String[] { path };
AddPathList( access, pathList, false, true, false );
}
[System.Security.SecuritySafeCritical] // auto-generated
public void AddPathList( FileIOPermissionAccess access, String[] pathList )
{
AddPathList( access, pathList, true, true, true );
}
[System.Security.SecurityCritical] // auto-generated
internal void AddPathList( FileIOPermissionAccess access, String[] pathListOrig, bool checkForDuplicates, bool needFullPath, bool copyPathList )
{
AddPathList( access, AccessControlActions.None, pathListOrig, checkForDuplicates, needFullPath, copyPathList );
}
[System.Security.SecurityCritical] // auto-generated
internal void AddPathList(FileIOPermissionAccess access, AccessControlActions control, String[] pathListOrig, bool checkForDuplicates, bool needFullPath, bool copyPathList)
{
if (pathListOrig == null)
{
throw new ArgumentNullException( "pathList" );
}
if (pathListOrig.Length == 0)
{
throw new ArgumentException( Environment.GetResourceString("Argument_EmptyPath" ));
}
Contract.EndContractBlock();
// @
VerifyAccess(access);
if (m_unrestricted)
return;
String[] pathList = pathListOrig;
if(copyPathList)
{
// Make a copy of pathList (in case its value changes after we check for illegal chars)
pathList = new String[pathListOrig.Length];
Array.Copy(pathListOrig, pathList, pathListOrig.Length);
}
CheckIllegalCharacters( pathList );
ArrayList pathArrayList = StringExpressionSet.CreateListFromExpressions(pathList, needFullPath);
if ((access & FileIOPermissionAccess.Read) != 0)
{
if (m_read == null)
{
m_read = new FileIOAccess();
}
m_read.AddExpressions( pathArrayList, checkForDuplicates);
}
if ((access & FileIOPermissionAccess.Write) != 0)
{
if (m_write == null)
{
m_write = new FileIOAccess();
}
m_write.AddExpressions( pathArrayList, checkForDuplicates);
}
if ((access & FileIOPermissionAccess.Append) != 0)
{
if (m_append == null)
{
m_append = new FileIOAccess();
}
m_append.AddExpressions( pathArrayList, checkForDuplicates);
}
if ((access & FileIOPermissionAccess.PathDiscovery) != 0)
{
if (m_pathDiscovery == null)
{
m_pathDiscovery = new FileIOAccess( true );
}
m_pathDiscovery.AddExpressions( pathArrayList, checkForDuplicates);
}
#if FEATURE_MACL
if ((control & AccessControlActions.View) != 0)
{
if (m_viewAcl == null)
{
m_viewAcl = new FileIOAccess();
}
m_viewAcl.AddExpressions( pathArrayList, checkForDuplicates);
}
if ((control & AccessControlActions.Change) != 0)
{
if (m_changeAcl == null)
{
m_changeAcl = new FileIOAccess();
}
m_changeAcl.AddExpressions( pathArrayList, checkForDuplicates);
}
#endif
}
[SecuritySafeCritical]
public String[] GetPathList( FileIOPermissionAccess access )
{
VerifyAccess( access );
ExclusiveAccess( access );
if (AccessIsSet( access, FileIOPermissionAccess.Read ))
{
if (m_read == null)
{
return null;
}
return m_read.ToStringArray();
}
if (AccessIsSet( access, FileIOPermissionAccess.Write ))
{
if (m_write == null)
{
return null;
}
return m_write.ToStringArray();
}
if (AccessIsSet( access, FileIOPermissionAccess.Append ))
{
if (m_append == null)
{
return null;
}
return m_append.ToStringArray();
}
if (AccessIsSet( access, FileIOPermissionAccess.PathDiscovery ))
{
if (m_pathDiscovery == null)
{
return null;
}
return m_pathDiscovery.ToStringArray();
}
// not reached
return null;
}
public FileIOPermissionAccess AllLocalFiles
{
get
{
if (m_unrestricted)
return FileIOPermissionAccess.AllAccess;
FileIOPermissionAccess access = FileIOPermissionAccess.NoAccess;
if (m_read != null && m_read.AllLocalFiles)
{
access |= FileIOPermissionAccess.Read;
}
if (m_write != null && m_write.AllLocalFiles)
{
access |= FileIOPermissionAccess.Write;
}
if (m_append != null && m_append.AllLocalFiles)
{
access |= FileIOPermissionAccess.Append;
}
if (m_pathDiscovery != null && m_pathDiscovery.AllLocalFiles)
{
access |= FileIOPermissionAccess.PathDiscovery;
}
return access;
}
set
{
if ((value & FileIOPermissionAccess.Read) != 0)
{
if (m_read == null)
m_read = new FileIOAccess();
m_read.AllLocalFiles = true;
}
else
{
if (m_read != null)
m_read.AllLocalFiles = false;
}
if ((value & FileIOPermissionAccess.Write) != 0)
{
if (m_write == null)
m_write = new FileIOAccess();
m_write.AllLocalFiles = true;
}
else
{
if (m_write != null)
m_write.AllLocalFiles = false;
}
if ((value & FileIOPermissionAccess.Append) != 0)
{
if (m_append == null)
m_append = new FileIOAccess();
m_append.AllLocalFiles = true;
}
else
{
if (m_append != null)
m_append.AllLocalFiles = false;
}
if ((value & FileIOPermissionAccess.PathDiscovery) != 0)
{
if (m_pathDiscovery == null)
m_pathDiscovery = new FileIOAccess( true );
m_pathDiscovery.AllLocalFiles = true;
}
else
{
if (m_pathDiscovery != null)
m_pathDiscovery.AllLocalFiles = false;
}
}
}
public FileIOPermissionAccess AllFiles
{
get
{
if (m_unrestricted)
return FileIOPermissionAccess.AllAccess;
FileIOPermissionAccess access = FileIOPermissionAccess.NoAccess;
if (m_read != null && m_read.AllFiles)
{
access |= FileIOPermissionAccess.Read;
}
if (m_write != null && m_write.AllFiles)
{
access |= FileIOPermissionAccess.Write;
}
if (m_append != null && m_append.AllFiles)
{
access |= FileIOPermissionAccess.Append;
}
if (m_pathDiscovery != null && m_pathDiscovery.AllFiles)
{
access |= FileIOPermissionAccess.PathDiscovery;
}
return access;
}
set
{
if (value == FileIOPermissionAccess.AllAccess)
{
m_unrestricted = true;
return;
}
if ((value & FileIOPermissionAccess.Read) != 0)
{
if (m_read == null)
m_read = new FileIOAccess();
m_read.AllFiles = true;
}
else
{
if (m_read != null)
m_read.AllFiles = false;
}
if ((value & FileIOPermissionAccess.Write) != 0)
{
if (m_write == null)
m_write = new FileIOAccess();
m_write.AllFiles = true;
}
else
{
if (m_write != null)
m_write.AllFiles = false;
}
if ((value & FileIOPermissionAccess.Append) != 0)
{
if (m_append == null)
m_append = new FileIOAccess();
m_append.AllFiles = true;
}
else
{
if (m_append != null)
m_append.AllFiles = false;
}
if ((value & FileIOPermissionAccess.PathDiscovery) != 0)
{
if (m_pathDiscovery == null)
m_pathDiscovery = new FileIOAccess( true );
m_pathDiscovery.AllFiles = true;
}
else
{
if (m_pathDiscovery != null)
m_pathDiscovery.AllFiles = false;
}
}
}
[Pure]
private static void VerifyAccess( FileIOPermissionAccess access )
{
if ((access & ~FileIOPermissionAccess.AllAccess) != 0)
throw new ArgumentException(Environment.GetResourceString("Arg_EnumIllegalVal", (int)access));
}
[Pure]
private static void ExclusiveAccess( FileIOPermissionAccess access )
{
if (access == FileIOPermissionAccess.NoAccess)
{
throw new ArgumentException( Environment.GetResourceString("Arg_EnumNotSingleFlag") );
}
if (((int) access & ((int)access-1)) != 0)
{
throw new ArgumentException( Environment.GetResourceString("Arg_EnumNotSingleFlag") );
}
}
private static void CheckIllegalCharacters( String[] str )
{
for (int i = 0; i < str.Length; ++i)
{
Path.CheckInvalidPathChars(str[i], true);
}
}
private static bool AccessIsSet( FileIOPermissionAccess access, FileIOPermissionAccess question )
{
return (access & question) != 0;
}
private bool IsEmpty()
{
return (!m_unrestricted &&
(this.m_read == null || this.m_read.IsEmpty()) &&
(this.m_write == null || this.m_write.IsEmpty()) &&
(this.m_append == null || this.m_append.IsEmpty()) &&
(this.m_pathDiscovery == null || this.m_pathDiscovery.IsEmpty()) &&
(this.m_viewAcl == null || this.m_viewAcl.IsEmpty()) &&
(this.m_changeAcl == null || this.m_changeAcl.IsEmpty()));
}
//------------------------------------------------------
//
// CODEACCESSPERMISSION IMPLEMENTATION
//
//------------------------------------------------------
public bool IsUnrestricted()
{
return m_unrestricted;
}
//------------------------------------------------------
//
// IPERMISSION IMPLEMENTATION
//
//------------------------------------------------------
public override bool IsSubsetOf(IPermission target)
{
if (target == null)
{
return this.IsEmpty();
}
FileIOPermission operand = target as FileIOPermission;
if (operand == null)
throw new ArgumentException(Environment.GetResourceString("Argument_WrongType", this.GetType().FullName));
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 )) &&
(this.m_append == null || this.m_append.IsSubsetOf( operand.m_append )) &&
(this.m_pathDiscovery == null || this.m_pathDiscovery.IsSubsetOf( operand.m_pathDiscovery )) &&
(this.m_viewAcl == null || this.m_viewAcl.IsSubsetOf( operand.m_viewAcl )) &&
(this.m_changeAcl == null || this.m_changeAcl.IsSubsetOf( operand.m_changeAcl )));
}
public override IPermission Intersect(IPermission target)
{
if (target == null)
{
return null;
}
FileIOPermission operand = target as FileIOPermission;
if (operand == null)
{
throw new ArgumentException(Environment.GetResourceString("Argument_WrongType", this.GetType().FullName));
}
else if (this.IsUnrestricted())
{
return target.Copy();
}
if (operand.IsUnrestricted())
{
return this.Copy();
}
FileIOAccess intersectRead = this.m_read == null ? null : this.m_read.Intersect( operand.m_read );
FileIOAccess intersectWrite = this.m_write == null ? null : this.m_write.Intersect( operand.m_write );
FileIOAccess intersectAppend = this.m_append == null ? null : this.m_append.Intersect( operand.m_append );
FileIOAccess intersectPathDiscovery = this.m_pathDiscovery == null ? null : this.m_pathDiscovery.Intersect( operand.m_pathDiscovery );
FileIOAccess intersectViewAcl = this.m_viewAcl == null ? null : this.m_viewAcl.Intersect( operand.m_viewAcl );
FileIOAccess intersectChangeAcl = this.m_changeAcl == null ? null : this.m_changeAcl.Intersect( operand.m_changeAcl );
if ((intersectRead == null || intersectRead.IsEmpty()) &&
(intersectWrite == null || intersectWrite.IsEmpty()) &&
(intersectAppend == null || intersectAppend.IsEmpty()) &&
(intersectPathDiscovery == null || intersectPathDiscovery.IsEmpty()) &&
(intersectViewAcl == null || intersectViewAcl.IsEmpty()) &&
(intersectChangeAcl == null || intersectChangeAcl.IsEmpty()))
{
return null;
}
FileIOPermission intersectPermission = new FileIOPermission(PermissionState.None);
intersectPermission.m_unrestricted = false;
intersectPermission.m_read = intersectRead;
intersectPermission.m_write = intersectWrite;
intersectPermission.m_append = intersectAppend;
intersectPermission.m_pathDiscovery = intersectPathDiscovery;
intersectPermission.m_viewAcl = intersectViewAcl;
intersectPermission.m_changeAcl = intersectChangeAcl;
return intersectPermission;
}
public override IPermission Union(IPermission other)
{
if (other == null)
{
return this.Copy();
}
FileIOPermission operand = other as FileIOPermission;
if (operand == null)
{
throw new ArgumentException(Environment.GetResourceString("Argument_WrongType", this.GetType().FullName));
}
if (this.IsUnrestricted() || operand.IsUnrestricted())
{
return new FileIOPermission( PermissionState.Unrestricted );
}
FileIOAccess unionRead = this.m_read == null ? operand.m_read : this.m_read.Union( operand.m_read );
FileIOAccess unionWrite = this.m_write == null ? operand.m_write : this.m_write.Union( operand.m_write );
FileIOAccess unionAppend = this.m_append == null ? operand.m_append : this.m_append.Union( operand.m_append );
FileIOAccess unionPathDiscovery = this.m_pathDiscovery == null ? operand.m_pathDiscovery : this.m_pathDiscovery.Union( operand.m_pathDiscovery );
FileIOAccess unionViewAcl = this.m_viewAcl == null ? operand.m_viewAcl : this.m_viewAcl.Union( operand.m_viewAcl );
FileIOAccess unionChangeAcl = this.m_changeAcl == null ? operand.m_changeAcl : this.m_changeAcl.Union( operand.m_changeAcl );
if ((unionRead == null || unionRead.IsEmpty()) &&
(unionWrite == null || unionWrite.IsEmpty()) &&
(unionAppend == null || unionAppend.IsEmpty()) &&
(unionPathDiscovery == null || unionPathDiscovery.IsEmpty()) &&
(unionViewAcl == null || unionViewAcl.IsEmpty()) &&
(unionChangeAcl == null || unionChangeAcl.IsEmpty()))
{
return null;
}
FileIOPermission unionPermission = new FileIOPermission(PermissionState.None);
unionPermission.m_unrestricted = false;
unionPermission.m_read = unionRead;
unionPermission.m_write = unionWrite;
unionPermission.m_append = unionAppend;
unionPermission.m_pathDiscovery = unionPathDiscovery;
unionPermission.m_viewAcl = unionViewAcl;
unionPermission.m_changeAcl = unionChangeAcl;
return unionPermission;
}
public override IPermission Copy()
{
FileIOPermission copy = new FileIOPermission(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();
}
if (this.m_append != null)
{
copy.m_append = this.m_append.Copy();
}
if (this.m_pathDiscovery != null)
{
copy.m_pathDiscovery = this.m_pathDiscovery.Copy();
}
if (this.m_viewAcl != null)
{
copy.m_viewAcl = this.m_viewAcl.Copy();
}
if (this.m_changeAcl != null)
{
copy.m_changeAcl = this.m_changeAcl.Copy();
}
}
return copy;
}
#if FEATURE_CAS_POLICY
public override SecurityElement ToXml()
{
SecurityElement esd = CodeAccessPermission.CreatePermissionElement( this, "System.Security.Permissions.FileIOPermission" );
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() ) );
}
if (this.m_append != null && !this.m_append.IsEmpty())
{
esd.AddAttribute( "Append", SecurityElement.Escape( m_append.ToString() ) );
}
if (this.m_pathDiscovery != null && !this.m_pathDiscovery.IsEmpty())
{
esd.AddAttribute( "PathDiscovery", SecurityElement.Escape( m_pathDiscovery.ToString() ) );
}
if (this.m_viewAcl != null && !this.m_viewAcl.IsEmpty())
{
esd.AddAttribute( "ViewAcl", SecurityElement.Escape( m_viewAcl.ToString() ) );
}
if (this.m_changeAcl != null && !this.m_changeAcl.IsEmpty())
{
esd.AddAttribute( "ChangeAcl", SecurityElement.Escape( m_changeAcl.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;
et = esd.Attribute( "Read" );
if (et != null)
{
m_read = new FileIOAccess( et );
}
else
{
m_read = null;
}
et = esd.Attribute( "Write" );
if (et != null)
{
m_write = new FileIOAccess( et );
}
else
{
m_write = null;
}
et = esd.Attribute( "Append" );
if (et != null)
{
m_append = new FileIOAccess( et );
}
else
{
m_append = null;
}
et = esd.Attribute( "PathDiscovery" );
if (et != null)
{
m_pathDiscovery = new FileIOAccess( et );
m_pathDiscovery.PathDiscovery = true;
}
else
{
m_pathDiscovery = null;
}
et = esd.Attribute( "ViewAcl" );
if (et != null)
{
m_viewAcl = new FileIOAccess( et );
}
else
{
m_viewAcl = null;
}
et = esd.Attribute( "ChangeAcl" );
if (et != null)
{
m_changeAcl = new FileIOAccess( et );
}
else
{
m_changeAcl = null;
}
}
#endif // FEATURE_CAS_POLICY
/// <internalonly/>
int IBuiltInPermission.GetTokenIndex()
{
return FileIOPermission.GetTokenIndex();
}
internal static int GetTokenIndex()
{
return BuiltInPermissionIndex.FileIOPermissionIndex;
}
[System.Runtime.InteropServices.ComVisible(false)]
public override bool Equals(Object obj)
{
FileIOPermission perm = obj as FileIOPermission;
if(perm == null)
return false;
if(m_unrestricted && perm.m_unrestricted)
return true;
if(m_unrestricted != perm.m_unrestricted)
return false;
if(m_read == null)
{
if(perm.m_read != null && !perm.m_read.IsEmpty())
return false;
}
else if(!m_read.Equals(perm.m_read))
return false;
if(m_write == null)
{
if(perm.m_write != null && !perm.m_write.IsEmpty())
return false;
}
else if(!m_write.Equals(perm.m_write))
return false;
if(m_append == null)
{
if(perm.m_append != null && !perm.m_append.IsEmpty())
return false;
}
else if(!m_append.Equals(perm.m_append))
return false;
if(m_pathDiscovery == null)
{
if(perm.m_pathDiscovery != null && !perm.m_pathDiscovery.IsEmpty())
return false;
}
else if(!m_pathDiscovery.Equals(perm.m_pathDiscovery))
return false;
if(m_viewAcl == null)
{
if(perm.m_viewAcl != null && !perm.m_viewAcl.IsEmpty())
return false;
}
else if(!m_viewAcl.Equals(perm.m_viewAcl))
return false;
if(m_changeAcl == null)
{
if(perm.m_changeAcl != null && !perm.m_changeAcl.IsEmpty())
return false;
}
else if(!m_changeAcl.Equals(perm.m_changeAcl))
return false;
return true;
}
[System.Runtime.InteropServices.ComVisible(false)]
public override int GetHashCode()
{
// This implementation is only to silence a compiler warning.
return base.GetHashCode();
}
/// <summary>
/// Call this method if you don't need a the FileIOPermission for anything other than calling Demand() once.
///
/// This method tries to verify full access before allocating a FileIOPermission object.
/// If full access is there, then we still have to emulate the checks that creating the
/// FileIOPermission object would have performed.
///
/// IMPORTANT: This method should only be used after calling GetFullPath on the path to verify
///
/// </summary>
/// <param name="access"></param>
/// <param name="path"></param>
/// <param name="checkForDuplicates"></param>
/// <param name="needFullPath"></param>
[System.Security.SecuritySafeCritical]
internal static void QuickDemand(FileIOPermissionAccess access, string fullPath, bool checkForDuplicates, bool needFullPath)
{
if (!CodeAccessSecurityEngine.QuickCheckForAllDemands())
{
new FileIOPermission(access, new string[] { fullPath }, checkForDuplicates, needFullPath).Demand();
}
else
{
//Emulate FileIOPermission checks
Path.CheckInvalidPathChars(fullPath, true);
if (fullPath.Length > 2 && fullPath.IndexOf(':', 2) != -1)
{
throw new NotSupportedException(Environment.GetResourceString("Argument_PathFormatNotSupported"));
}
}
}
}
[Serializable]
internal sealed class FileIOAccess
{
#if !FEATURE_CASE_SENSITIVE_FILESYSTEM
private bool m_ignoreCase = true;
#else
private bool m_ignoreCase = false;
#endif // !FEATURE_CASE_SENSITIVE_FILESYSTEM
private StringExpressionSet m_set;
private bool m_allFiles;
private bool m_allLocalFiles;
private bool m_pathDiscovery;
private const String m_strAllFiles = "*AllFiles*";
private const String m_strAllLocalFiles = "*AllLocalFiles*";
public FileIOAccess()
{
m_set = new StringExpressionSet( m_ignoreCase, true );
m_allFiles = false;
m_allLocalFiles = false;