Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Core / CSharp / MS / Internal / FontCache / FontSourceCollection.cs / 1 / FontSourceCollection.cs
//----------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// Description: The FontSourceCollection class represents a collection of font files.
//
// History:
// 08/25/2005 : mleonov - Created it
//
//---------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.IO.Packaging;
using System.Net;
using System.Runtime.InteropServices;
using System.Security;
using System.Security.Permissions;
using System.Windows;
using System.Windows.Media;
using System.Windows.Threading;
using Microsoft.Win32;
using MS.Win32;
using MS.Utility;
using MS.Internal;
using MS.Internal.IO.Packaging;
using MS.Internal.PresentationCore;
namespace MS.Internal.FontCache
{
///
/// FontSourceCollection class represents a collection of font files.
///
internal class FontSourceCollection : IEnumerable
{
///
/// Critical - The folderUri parameter is critical as it may contain privileged information
/// about the file system (i.e., location of Windows Fonts); it is assigned to
/// the _uri field which is declared critical.
///
/// The isWindowsFonts parameter is critical for set as it is used to make a
/// security decision (i.e., whether to assert read access); it is assigned to
/// the _isWindowsFonts field which is declared critical.
///
[SecurityCritical]
public FontSourceCollection(Uri folderUri, bool isWindowsFonts)
{
if (!Util.IsEnumerableFontUriScheme(folderUri))
{
throw new ArgumentException(SR.Get(SRID.UriMustBeFileOrPack));
}
_uri = folderUri;
_isWindowsFonts = isWindowsFonts;
InitializeDirectoryProperties();
}
///
/// Critical - _uri can contain information about local file system.
/// TreatAsSafe - exposing one bit of information about whether it's application specific is safe.
///
public bool IsAppSpecific
{
[SecurityCritical, SecurityTreatAsSafe]
get
{
return Util.IsAppSpecificUri(_uri);
}
}
public long TimeStamp
{
get
{
return _timeStamp;
}
}
///
/// Critical: This code accesses _uri and local Windows\fonts path.
/// It also elevates to access the GetLastWriteTimeUtc, Exists and GetRegistryKeyLastWriteTimeUtc functions.
/// Safe: This only does an elevation for WindowsFont directory and Fonts registry key.
/// Both are safe. For anything else CAS will kick in and demand FileIORead permission.
///
[SecurityCritical, SecurityTreatAsSafe]
private void InitializeDirectoryProperties()
{
_timeStamp = -1;
_isFileSystemFolder = false;
if (_uri.IsFile)
{
string localPath;
if (_isWindowsFonts)
{
if (object.ReferenceEquals(_uri, Util.WindowsFontsUriObject))
{
// We know the local path and that it's a folder
localPath = Util.WindowsFontsLocalPath;
_isFileSystemFolder = true;
}
else
{
// It's a file within the Windows Fonts folder
localPath = _uri.LocalPath;
_isFileSystemFolder = false;
}
// Allow any client to access default fonts collection
new FileIOPermission(
FileIOPermissionAccess.Read,
localPath).Assert(); // BlessedAssert
}
else
{
// Get the local path
localPath = _uri.LocalPath;
// Decide if it's a file or folder based on syntax, not contents of file system
_isFileSystemFolder = localPath[localPath.Length - 1] == Path.DirectorySeparatorChar;
}
try
{
if (_isFileSystemFolder)
{
// DirectoryInfo does a demand to check the client code's access to the folder
DirectoryInfo directoryInfo = new DirectoryInfo(localPath);
if (directoryInfo.Exists)
{
_timeStamp = directoryInfo.LastWriteTimeUtc.Ticks;
}
if (_isWindowsFonts)
{
long registryTimeStamp;
if (Util2.GetRegistryKeyLastWriteTimeUtc(InstalledWindowsFontsRegistryKey, out registryTimeStamp))
{
_timeStamp = Math.Max(_timeStamp, registryTimeStamp);
}
}
}
else
{
FileInfo fileInfo = new FileInfo(localPath);
if (fileInfo.Exists)
_timeStamp = fileInfo.LastWriteTimeUtc.Ticks;
}
}
finally
{
if (_isWindowsFonts)
FileIOPermission.RevertAssert();
}
}
}
///
/// Critical - as this allows you list files in windows font directory
/// and returns the file list.
/// Safe - This only does an elevation for WindowsFont directory which is safe,
/// and relevant data is already protected via FontSource methods.
///
[SecurityCritical, SecurityTreatAsSafe]
private void SetFontSources()
{
if (_fontSources != null)
return;
lock (this)
{
List fontSources;
if (_uri.IsFile)
{
ICollection files;
if (_isFileSystemFolder)
{
if (_isWindowsFonts)
{
PermissionSet permissionSet = new PermissionSet(null);
// Read and path discovery permission for the %windir%\font path.
permissionSet.AddPermission(new FileIOPermission(
FileIOPermissionAccess.Read | FileIOPermissionAccess.PathDiscovery,
Util.WindowsFontsUriObject.LocalPath));
// Registry read permissions for the Fonts system registry entry.
permissionSet.AddPermission(new RegistryPermission(
RegistryPermissionAccess.Read,
InstalledWindowsFontsRegistryKeyFullPath));
permissionSet.Assert(); // BlessedAssert
try
{
// fontPaths accumulates font file paths obtained from the registry and the file system
// This collection is a set, i.e. only keys matter, not values.
Dictionary fontPaths = new Dictionary(512, StringComparer.OrdinalIgnoreCase);
using (RegistryKey fontsKey = Registry.LocalMachine.OpenSubKey(InstalledWindowsFontsRegistryKey))
{
// The registry key should be present on a valid Windows installation.
Invariant.Assert(fontsKey != null);
foreach (string fontValue in fontsKey.GetValueNames())
{
string fileName = fontsKey.GetValue(fontValue) as string;
if (fileName != null)
{
// See if the path doesn't contain any directory information.
// Shell uses the same method to determine whether to prepend the path with %windir%\fonts.
if (Path.GetFileName(fileName) == fileName)
fileName = Path.Combine(Util.WindowsFontsLocalPath, fileName);
fontPaths[fileName] = null;
}
}
}
foreach (string file in Directory.GetFiles(_uri.LocalPath))
{
fontPaths[file] = null;
}
files = fontPaths.Keys;
}
finally
{
if (_isWindowsFonts)
CodeAccessPermission.RevertAssert();
}
}
else
{
files = Directory.GetFiles(_uri.LocalPath);
}
}
else
{
files = new string[1] {_uri.LocalPath};
}
fontSources = new List(files.Count);
foreach (string file in files)
{
bool isComposite;
if (Util.IsSupportedFontExtension(Path.GetExtension(file), out isComposite))
fontSources.Add(new FontSource(new Uri(file, UriKind.Absolute), _isWindowsFonts));
}
}
else
{
List resourceEntries = FontResourceCache.LookupFolder(_uri);
if (resourceEntries == null)
fontSources = new List(0);
else
{
// Enumerate application resources, content files and container structure.
fontSources = new List(resourceEntries.Count);
foreach (string resourceName in resourceEntries)
{
// If resourceName is an empty string, this means that the _uri is a full file name;
// otherwise resourceName is a file name within a folder.
if (String.IsNullOrEmpty(resourceName))
fontSources.Add(new FontSource(_uri, _isWindowsFonts));
else
fontSources.Add(new FontSource(new Uri(_uri, resourceName), _isWindowsFonts));
}
}
}
_fontSources = fontSources;
}
}
///
/// Critical - as this returns a local Uri.
///
private string ComparisonKey
{
[SecurityCritical]
get
{
// Local file paths and pack Uris in container/applications scenarios are all case insensitive.
return GetUriString().ToUpperInvariant();
}
}
#region IEnumerable Members
public IEnumerator GetEnumerator()
{
SetFontSources();
return _fontSources.GetEnumerator();
}
#endregion
#region IEnumerable Members
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
SetFontSources();
return _fontSources.GetEnumerator();
}
#endregion
///
/// Critical - fontUri can contain information about local file system.
///
[SecurityCritical]
public string GetUriString()
{
return _uri.GetComponents(UriComponents.AbsoluteUri, UriFormat.SafeUnescaped);
}
///
/// Critical - font Uri can contain information about local file system.
/// TreatAsSafe - we only compute its hash code.
///
[SecurityCritical, SecurityTreatAsSafe]
public override int GetHashCode()
{
return HashFn.HashString(ComparisonKey, 0);
}
public override bool Equals(object obj)
{
FontSourceCollection other = obj as FontSourceCollection;
if (other == null)
return false;
return Equals(other);
}
///
/// Critical - fontUri can contain information about local file system.
/// TreatAsSafe - we only use it for quality comparison.
///
[SecurityCritical, SecurityTreatAsSafe]
public bool Equals(FontSourceCollection other)
{
return String.Equals(ComparisonKey, other.ComparisonKey, StringComparison.Ordinal);
}
///
/// Critical - fontUri can contain information about local file system.
///
[SecurityCritical]
private Uri _uri;
private long _timeStamp;
///
/// Critical - this value is used to make security decisions (i.e., whether to do an Assert)
/// so it can only be set by critical code.
///
[SecurityCritical]
private bool _isWindowsFonts;
// _isFileSystemFolder flag makes sense only when _uri.IsFile is set to true.
private bool _isFileSystemFolder;
private volatile IList _fontSources;
private const string InstalledWindowsFontsRegistryKey = @"SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts";
private const string InstalledWindowsFontsRegistryKeyFullPath = @"HKEY_LOCAL_MACHINE\" + InstalledWindowsFontsRegistryKey;
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//----------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// Description: The FontSourceCollection class represents a collection of font files.
//
// History:
// 08/25/2005 : mleonov - Created it
//
//---------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.IO.Packaging;
using System.Net;
using System.Runtime.InteropServices;
using System.Security;
using System.Security.Permissions;
using System.Windows;
using System.Windows.Media;
using System.Windows.Threading;
using Microsoft.Win32;
using MS.Win32;
using MS.Utility;
using MS.Internal;
using MS.Internal.IO.Packaging;
using MS.Internal.PresentationCore;
namespace MS.Internal.FontCache
{
///
/// FontSourceCollection class represents a collection of font files.
///
internal class FontSourceCollection : IEnumerable
{
///
/// Critical - The folderUri parameter is critical as it may contain privileged information
/// about the file system (i.e., location of Windows Fonts); it is assigned to
/// the _uri field which is declared critical.
///
/// The isWindowsFonts parameter is critical for set as it is used to make a
/// security decision (i.e., whether to assert read access); it is assigned to
/// the _isWindowsFonts field which is declared critical.
///
[SecurityCritical]
public FontSourceCollection(Uri folderUri, bool isWindowsFonts)
{
if (!Util.IsEnumerableFontUriScheme(folderUri))
{
throw new ArgumentException(SR.Get(SRID.UriMustBeFileOrPack));
}
_uri = folderUri;
_isWindowsFonts = isWindowsFonts;
InitializeDirectoryProperties();
}
///
/// Critical - _uri can contain information about local file system.
/// TreatAsSafe - exposing one bit of information about whether it's application specific is safe.
///
public bool IsAppSpecific
{
[SecurityCritical, SecurityTreatAsSafe]
get
{
return Util.IsAppSpecificUri(_uri);
}
}
public long TimeStamp
{
get
{
return _timeStamp;
}
}
///
/// Critical: This code accesses _uri and local Windows\fonts path.
/// It also elevates to access the GetLastWriteTimeUtc, Exists and GetRegistryKeyLastWriteTimeUtc functions.
/// Safe: This only does an elevation for WindowsFont directory and Fonts registry key.
/// Both are safe. For anything else CAS will kick in and demand FileIORead permission.
///
[SecurityCritical, SecurityTreatAsSafe]
private void InitializeDirectoryProperties()
{
_timeStamp = -1;
_isFileSystemFolder = false;
if (_uri.IsFile)
{
string localPath;
if (_isWindowsFonts)
{
if (object.ReferenceEquals(_uri, Util.WindowsFontsUriObject))
{
// We know the local path and that it's a folder
localPath = Util.WindowsFontsLocalPath;
_isFileSystemFolder = true;
}
else
{
// It's a file within the Windows Fonts folder
localPath = _uri.LocalPath;
_isFileSystemFolder = false;
}
// Allow any client to access default fonts collection
new FileIOPermission(
FileIOPermissionAccess.Read,
localPath).Assert(); // BlessedAssert
}
else
{
// Get the local path
localPath = _uri.LocalPath;
// Decide if it's a file or folder based on syntax, not contents of file system
_isFileSystemFolder = localPath[localPath.Length - 1] == Path.DirectorySeparatorChar;
}
try
{
if (_isFileSystemFolder)
{
// DirectoryInfo does a demand to check the client code's access to the folder
DirectoryInfo directoryInfo = new DirectoryInfo(localPath);
if (directoryInfo.Exists)
{
_timeStamp = directoryInfo.LastWriteTimeUtc.Ticks;
}
if (_isWindowsFonts)
{
long registryTimeStamp;
if (Util2.GetRegistryKeyLastWriteTimeUtc(InstalledWindowsFontsRegistryKey, out registryTimeStamp))
{
_timeStamp = Math.Max(_timeStamp, registryTimeStamp);
}
}
}
else
{
FileInfo fileInfo = new FileInfo(localPath);
if (fileInfo.Exists)
_timeStamp = fileInfo.LastWriteTimeUtc.Ticks;
}
}
finally
{
if (_isWindowsFonts)
FileIOPermission.RevertAssert();
}
}
}
///
/// Critical - as this allows you list files in windows font directory
/// and returns the file list.
/// Safe - This only does an elevation for WindowsFont directory which is safe,
/// and relevant data is already protected via FontSource methods.
///
[SecurityCritical, SecurityTreatAsSafe]
private void SetFontSources()
{
if (_fontSources != null)
return;
lock (this)
{
List fontSources;
if (_uri.IsFile)
{
ICollection files;
if (_isFileSystemFolder)
{
if (_isWindowsFonts)
{
PermissionSet permissionSet = new PermissionSet(null);
// Read and path discovery permission for the %windir%\font path.
permissionSet.AddPermission(new FileIOPermission(
FileIOPermissionAccess.Read | FileIOPermissionAccess.PathDiscovery,
Util.WindowsFontsUriObject.LocalPath));
// Registry read permissions for the Fonts system registry entry.
permissionSet.AddPermission(new RegistryPermission(
RegistryPermissionAccess.Read,
InstalledWindowsFontsRegistryKeyFullPath));
permissionSet.Assert(); // BlessedAssert
try
{
// fontPaths accumulates font file paths obtained from the registry and the file system
// This collection is a set, i.e. only keys matter, not values.
Dictionary fontPaths = new Dictionary(512, StringComparer.OrdinalIgnoreCase);
using (RegistryKey fontsKey = Registry.LocalMachine.OpenSubKey(InstalledWindowsFontsRegistryKey))
{
// The registry key should be present on a valid Windows installation.
Invariant.Assert(fontsKey != null);
foreach (string fontValue in fontsKey.GetValueNames())
{
string fileName = fontsKey.GetValue(fontValue) as string;
if (fileName != null)
{
// See if the path doesn't contain any directory information.
// Shell uses the same method to determine whether to prepend the path with %windir%\fonts.
if (Path.GetFileName(fileName) == fileName)
fileName = Path.Combine(Util.WindowsFontsLocalPath, fileName);
fontPaths[fileName] = null;
}
}
}
foreach (string file in Directory.GetFiles(_uri.LocalPath))
{
fontPaths[file] = null;
}
files = fontPaths.Keys;
}
finally
{
if (_isWindowsFonts)
CodeAccessPermission.RevertAssert();
}
}
else
{
files = Directory.GetFiles(_uri.LocalPath);
}
}
else
{
files = new string[1] {_uri.LocalPath};
}
fontSources = new List(files.Count);
foreach (string file in files)
{
bool isComposite;
if (Util.IsSupportedFontExtension(Path.GetExtension(file), out isComposite))
fontSources.Add(new FontSource(new Uri(file, UriKind.Absolute), _isWindowsFonts));
}
}
else
{
List resourceEntries = FontResourceCache.LookupFolder(_uri);
if (resourceEntries == null)
fontSources = new List(0);
else
{
// Enumerate application resources, content files and container structure.
fontSources = new List(resourceEntries.Count);
foreach (string resourceName in resourceEntries)
{
// If resourceName is an empty string, this means that the _uri is a full file name;
// otherwise resourceName is a file name within a folder.
if (String.IsNullOrEmpty(resourceName))
fontSources.Add(new FontSource(_uri, _isWindowsFonts));
else
fontSources.Add(new FontSource(new Uri(_uri, resourceName), _isWindowsFonts));
}
}
}
_fontSources = fontSources;
}
}
///
/// Critical - as this returns a local Uri.
///
private string ComparisonKey
{
[SecurityCritical]
get
{
// Local file paths and pack Uris in container/applications scenarios are all case insensitive.
return GetUriString().ToUpperInvariant();
}
}
#region IEnumerable Members
public IEnumerator GetEnumerator()
{
SetFontSources();
return _fontSources.GetEnumerator();
}
#endregion
#region IEnumerable Members
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
SetFontSources();
return _fontSources.GetEnumerator();
}
#endregion
///
/// Critical - fontUri can contain information about local file system.
///
[SecurityCritical]
public string GetUriString()
{
return _uri.GetComponents(UriComponents.AbsoluteUri, UriFormat.SafeUnescaped);
}
///
/// Critical - font Uri can contain information about local file system.
/// TreatAsSafe - we only compute its hash code.
///
[SecurityCritical, SecurityTreatAsSafe]
public override int GetHashCode()
{
return HashFn.HashString(ComparisonKey, 0);
}
public override bool Equals(object obj)
{
FontSourceCollection other = obj as FontSourceCollection;
if (other == null)
return false;
return Equals(other);
}
///
/// Critical - fontUri can contain information about local file system.
/// TreatAsSafe - we only use it for quality comparison.
///
[SecurityCritical, SecurityTreatAsSafe]
public bool Equals(FontSourceCollection other)
{
return String.Equals(ComparisonKey, other.ComparisonKey, StringComparison.Ordinal);
}
///
/// Critical - fontUri can contain information about local file system.
///
[SecurityCritical]
private Uri _uri;
private long _timeStamp;
///
/// Critical - this value is used to make security decisions (i.e., whether to do an Assert)
/// so it can only be set by critical code.
///
[SecurityCritical]
private bool _isWindowsFonts;
// _isFileSystemFolder flag makes sense only when _uri.IsFile is set to true.
private bool _isFileSystemFolder;
private volatile IList _fontSources;
private const string InstalledWindowsFontsRegistryKey = @"SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts";
private const string InstalledWindowsFontsRegistryKeyFullPath = @"HKEY_LOCAL_MACHINE\" + InstalledWindowsFontsRegistryKey;
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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