Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Core / CSharp / MS / Internal / FontCache / FontCacheLogic.cs / 1 / FontCacheLogic.cs
//----------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//
// Description: Core font cache logic.
//
//---------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Security.Permissions;
using System.Security;
using System.Threading;
using System.Windows;
using System.Windows.Threading;
using MS.Internal;
using MS.Utility;
using MS.Win32;
using MS.Internal.PresentationCore;
using Microsoft.Internal;
// Since we disable PreSharp warnings in this file, we first need to disable warnings about unknown message numbers and unknown pragmas.
#pragma warning disable 1634, 1691
namespace MS.Internal.FontCache
{
///
/// FontCacheFullException is raised when the cache limit is reached
///
[FriendAccessAllowed]
internal class FontCacheFullException : ApplicationException
{
internal FontCacheFullException()
{}
}
///
/// An abstract entity stored in the cache
/// The layout is following:
/// 4 byte offset of next element
/// 4 byte element type
/// Everything else is element-specific
///
[FriendAccessAllowed]
internal interface IFontCacheElement
{
///
/// Matches this element with the one in the cache
///
/// Pointer to the element in the cache to compare with.
///
/// GetData is called when the element is found in cache
///
void GetData(CheckedPointer p, ElementCacher cacher);
///
/// AddToCache is called to add the element to cache
///
void AddToCache(CheckedPointer p, ElementCacher cacher);
///
/// Returns the number of bytes that ElementCacher should allocate for the element
///
int Size
{
get;
}
///
/// Integer value unique for the element
///
int Type
{
get;
}
///
/// Returns whether the font cache element is application specific and should not be looked for in the shared cache.
///
bool IsAppSpecific
{
get;
}
///
/// Elements must override default GetHashCode(), because different instances of otherwise identical elements
/// should map to the same hash code.
/// Important note - please avoid using standard CLR GetHashCode() calls in your GetHashCode() implementations,
/// as they may return different results depending on the target platform (32 bit vs. 64 bit).
/// Use HashFn helpers instead.
///
int GetHashCode();
///
/// Writes the element key into a memory block to be sent to the font cache service.
///
void StoreKey(CheckedPointer d, out int realSize);
///
/// Initializes the element using the element key from an input memory block.
///
void RetrieveKey(CheckedPointer s);
};
///
/// ElementCacher - manages cache lookup logic
/// Layout of the cache file
/// - fixed size hash table, 4 bytes per element
/// - user data pool, active length is variable, maximum length is determined by the font cache file size
///
[FriendAccessAllowed]
internal unsafe class ElementCacher
{
private const int numberOfBuckets = 512;
// offset should be at least 4 byte aligned
private const int offMarker = 0;
private const int offMaxSize = 4;
private const int offCurSize = 8;
private const int offVersion = 12;
internal const int offHashTable = 64;//used by HashTable class
private const int MinCacheSize = offHashTable + numberOfBuckets * 4;
[StructLayout(LayoutKind.Explicit, Size = 12)]
private struct CacheHeader
{
[FieldOffset(offMarker)]
internal int Marker;
[FieldOffset(offMaxSize)]
internal int MaxSize;
[FieldOffset(offCurSize)]
internal int CurSize;
}
// when changing cache or element layout, increment the value stored in this string
private const string _cacheVersionString = @"76";
private object _cacheLock = new Object();
private FileMapping _mfile;
private bool _shared;
private HashTable _hashTable;
//The allocated size of the cache, as determined by the most recent call to GetCacheMemoryRemaining().
//Since the cache size can never decrease, we know that at least this many bytes have been allocated
//for the cache, even if this value is out of date. Saving this value allows us to omit redundant
//calls to VirtualQuery().
//
//Note: _cacheAllocSize should be used instead of _mfile.Length because _cacheAllocSize
//updates itself inside the getter of Mapping if the cache grows; _mfile.Length does not
//get updated.
private volatile int _cacheAllocSize = 0;
//Returns a pointer the cache header, without bounds-checking
///Critical - accesses cache and returns a pointer
[SecurityCritical]
private unsafe CacheHeader* UnsafeGetCacheHeader()
{
return (CacheHeader*)(_mfile.PositionPointer);
}
//Returns CheckedPointer representing the cache version string. This is bounded
//by the start of the cache table.
///Critical - calls into critical code. TreatAsSafe - cache version is ok to give out
[SecurityCritical, SecurityTreatAsSafe]
private unsafe CheckedPointer GetVersionPointer()
{
//Bounds-checking the buffer is not necessary here since the version is part of the header
return new CheckedPointer(_mfile.PositionPointer + offVersion, offHashTable - offVersion);
}
//Returns a pointer to the cache header, assuming the cache has already been initialized
///Critical - accesses cache and returns a pointer
[SecurityCritical]
private unsafe CacheHeader* GetCacheHeader()
{
//Since the header is always in memory, Mapping.Probe() is equivlant
//to just calling the unsafe version
return UnsafeGetCacheHeader();
}
//Initializes the cache header
///Critical - calls UnsafeGetCacheHeader() and modifies the cache
[SecurityCritical]
private void InitCacheHeader(int curSize, int maxSize)
{
Util.AssertAligned8(curSize);
Util.AssertAligned8(maxSize);
Invariant.Assert(curSize >= MinCacheSize);
Invariant.Assert(maxSize >= curSize);
//First, commit the necessary memory
_mfile.Commit(MinCacheSize);
//The unsafe version is ok here since we just committed the memory. It is also
//mandatory because the safe version would throw ArgumentOutOfRangeException
//as the size has not been initialized yet
CacheHeader* header = UnsafeGetCacheHeader();
header->Marker = 0;
header->CurSize = curSize;
header->MaxSize = maxSize;
}
///
/// Critical: This code serves as an entry point to unsafe code Also it initializes the server cache filemapping
/// object which should not be null or spoofed
///
[SecurityCritical]
internal ElementCacher(FileMapping mfile, bool create, bool shared)
{
_mfile = mfile;
_shared = shared;
if (create)
{
//First, initialize the cache header; then, create the hash table.
InitCacheHeader(MinCacheSize, (int)_mfile.Capacity);
SetNew();
SetVersion();
_hashTable = new HashTable(this, numberOfBuckets);
_hashTable.Init();
// flush the cache so that clients have a consistent view of it
Thread.MemoryBarrier();
}
else
{
//Cache data is already initialized and committed to memory,
//so all we have to do is just initialize the hash table
_hashTable = new HashTable(this, numberOfBuckets);
}
}
~ElementCacher()
{
((IDisposable)_mfile).Dispose();
}
///
/// Specifies whether ElementCacher corresponds to an instance of shared cache.
/// Elements such as FamilyCollection perform error handling differently if they operate on the shared cache.
///
public bool IsShared
{
get
{
return _shared;
}
}
///
/// Critical: Calls into critical code which is unsafe to do string copy
/// TreatAsSafe: Ok to call since this sets version
///
[SecurityCritical,SecurityTreatAsSafe]
private void SetVersion()
{
Util.StringCopyToCheckedPointer(GetVersionPointer(), _cacheVersionString);
}
///
/// Critical:This code calls into _mapping which is a byte *
/// TreatAsSafe: This code is safe to expose
///
[SecurityCritical,SecurityTreatAsSafe]
internal bool VersionUpToDate()
{
return Util.StringEqual(GetVersionPointer(), _cacheVersionString);
}
///
/// Critical: This code calls GetCacheHeader, which returns a pointer
/// TreatAsSafe: get() accessor doesn't change anything and cache is always allocated to include the header
///
internal int MaxCacheSize
{
[SecurityCritical,SecurityTreatAsSafe]
get
{
return GetCacheHeader()->MaxSize;
}
[SecurityCritical]
set
{
GetCacheHeader()->MaxSize = value;
}
}
///
/// Critical: This code yieds unverifiable code
/// TreatAsSafe: Get is safe - doesn't change anything
///
internal int CurrentSize
{
[SecurityCritical,SecurityTreatAsSafe]
get
{
return GetCacheHeader()->CurSize;
}
}
///
/// Critical: This code yieds unverifiable code
/// TreatAsSafe: This operation is safe
///
[SecurityCritical,SecurityTreatAsSafe]
internal void SetNew()
{
GetCacheHeader()->Marker = 0;
}
///
/// Critical: This code yieds unverifiable code
/// TreatAsSafe: Marking this as obsolete is a safe operation
///
[SecurityCritical,SecurityTreatAsSafe]
internal void MarkObsolete()
{
GetCacheHeader()->Marker = 1;
}
///
/// Critical: This code does unsafe pointer manipulation
/// TreatAsSafe: This information is ok to give out
///
[SecurityCritical,SecurityTreatAsSafe]
internal bool IsObsolete()
{
return GetCacheHeader()->Marker != 0;
}
///
/// Critical: This code does unsafe pointer manipulations, and the input parameter may cause spoofing or overrun.
///
[SecurityCritical]
internal void InitFromCacheImage(CheckedPointer cacheImage)
{
if (cacheImage.Size < MinCacheSize ||
(cacheImage.Size % 8) != 0 ||
cacheImage.Size > MaxCacheSize)
{
// Malformed input cache, just return. Assert in debug builds to catch possible bugs.
Debug.Assert(false);
return;
}
int oldCurrentSize;
unsafe
{
// Validate the current size field in the existing cache image.
oldCurrentSize = *(int*)cacheImage.Probe(offCurSize, sizeof(int));
}
if (Util.Align8(oldCurrentSize) != oldCurrentSize || oldCurrentSize != cacheImage.Size)
{
// Malformed input cache, just return. Assert in debug builds to catch possible bugs.
Debug.Assert(false);
return;
}
_mfile.Commit(cacheImage.Size);
GetCacheHeader()->CurSize = cacheImage.Size;
cacheImage.CopyTo(Mapping);
// This can happen only if the current cache size field was not set properly in the cache image,
// and we should have caught this situation earlier in this function.
Invariant.Assert(CurrentSize == cacheImage.Size);
SetNew();
}
///
/// Critical: This code does unsafe pointer manipulations, and the input parameter may cause spoofing or overrun.
///
[SecurityCritical]
internal void InitFromPreviousCache(ElementCacher oldCache, int newCacheSize)
{
// We need to lock the old cache to make sure it's CurrentSize is not updated in the middle of the copy.
lock (oldCache.Lock)
{
InitFromCacheImage(oldCache.Mapping);
// Reset max cache size to the new size, because InitFromCacheImage overwrote it.
MaxCacheSize = newCacheSize;
}
}
///
/// Note: we use _mapping + offset directly instead of this indexer
/// in cases when CurrentSize property is not set yet
///
///
/// Critical: This code yield unverifiable code which triggers a demand
/// It also returns a pointer.
///
internal unsafe byte* this[int offset]
{
[SecurityCritical]
get
{
Invariant.Assert(offset != Util.nullOffset);
Invariant.Assert(0 <= offset && offset <= CurrentSize); // Note: offset==CurrentSize for zero length arrays
// Eventually we plan to switch everything to CheckedPointer,
// and this unsafe probe will go away. For now we rely on caller to
// specify correct buffer sizes when manipulating values returned from this[int].
return (byte*)(Mapping.Probe(offset, 0));
}
}
///
/// Critical: This code yield unverifiable code which triggers a demand
///
internal int this[byte* pointer]
{
[SecurityCritical]
get
{
long longRes = Mapping.OffsetOf(pointer);
int intRes = (int)longRes;
Invariant.Assert(longRes == intRes);
return intRes;
}
}
///
/// Critical: This code does unsafe pointer manipulation
/// TreatAsSafe: This code returns a checked pointer, getting to the data in it is critical
/// This acts like a container for the critical pointer and is all safe unless one
/// extracts the pointer
///
[SecurityCritical,SecurityTreatAsSafe]
internal CheckedPointer GetCheckedPointer(int offset)
{
Invariant.Assert(offset != Util.nullOffset && offset <= CurrentSize);
return Mapping + offset;
}
internal object Lock
{
get
{
return _cacheLock;
}
}
///
/// Allocates 8 byte aligned data from _mfile.
/// Throws FontCacheFullException if we are out of space
///
///
///
/// Critical: This code yield unverifiable code which triggers a demand
/// TreatAsSafe: This code allocates memory for the cacher and is safe
///
[SecurityCritical,SecurityTreatAsSafe]
internal int Alloc(int size)
{
Invariant.Assert(size >= 0);
// If the requested size is zero, we can return any offset within the file.
if (size == 0)
return 0;
lock(_cacheLock)
{
int oldSize = CurrentSize;
Util.AssertAligned8(oldSize);
int newSize = Util.Align8(oldSize + size);
Invariant.Assert(newSize > oldSize);
if (newSize > MaxCacheSize)
throw new FontCacheFullException();
//commit the memory for the new data
_mfile.Commit(newSize);
//Now, update the size entry in the cache header
GetCacheHeader()->CurSize = newSize;
Thread.MemoryBarrier();
return oldSize;
}
}
///
/// IFontCacheElement lookup
///
///
/// Adds the element if it doesn't exist in the cache.
/// Can be called only if caller is on the same side as cache construction (e.g. client-client).
/// Thread safe.
/// Throws FontCacheFullException in case of cache overflow
/// Returns whether the element already existed in the cache.
///
/// Critical: This code adds a font cache element to the hashtable
/// TreatAsSafe: This code is safe to expose since it simply adds an element to the cache
///
[SecurityCritical,SecurityTreatAsSafe]
internal bool LookupAndAdd(IFontCacheElement e)
{
return _hashTable.Lookup(e, true);
}
///
/// IFontCacheElement read-only lookup
///
///
/// Thread safe.
/// Returns whether the element was found in the cache.
///
/// Critical: This code yields unverifiable code which triggers a demand
/// TreatAsSafe: This information is ok to return
///
[SecurityCritical,SecurityTreatAsSafe]
internal bool ReadOnlyLookup(IFontCacheElement e)
{
return _hashTable.Lookup(e, false);
}
///
/// Critical - uses unsafe code blocks, performs pointer manipulation, and calls VirtualQuery() and CheckedPointer constructor
/// TreatAsSafe: Returned pointer is guaranteed to fall within the bounds of memory allocated for the cache.
///
internal CheckedPointer Mapping
{
[SecurityCritical, SecurityTreatAsSafe]
get
{
unsafe
{
//The size of the CheckedPointer buffer will be equal to the size of the cache,
//as contained in the mapping itself.
//To prevent corrupt cache data from causing buffer overflows, we check the cache size
//against the maximum cache size and number of bytes actually allocated for the cache.
//An Invariant.Assert() will be triggered if the cache size extends past the cache buffer.
//If the cache size field is larger than the actual cache size, but smaller than the cache buffer
//size, we are ok because this excess space is not being used for anything else and if it exposes
//corrupt internal offsets, we will eventually have a CheckedPointer ArgumentOutOfRangeException, rather
//than buffer overflow.
//Since FileMapping objects are guarenteed to be at least one page long, overflowing
//the buffer while accessing the font cache header information is not possible.
byte* mapping = _mfile.PositionPointer;
int currentCacheSize = *((int*)(mapping + offCurSize));
int maxCacheSize = *((int*)(mapping + offMaxSize));
Invariant.Assert(currentCacheSize <= maxCacheSize);
//Generate a local copy in case another thread changes _cacheAllocSize in this section
int cacheAllocSize = _cacheAllocSize;
if (currentCacheSize > cacheAllocSize)
{
//Verify that the cache has grown to accomodate the additional space.
int bytesRemaining = GetCacheMemoryRemaining(mapping + cacheAllocSize);
cacheAllocSize += bytesRemaining;
Invariant.Assert(currentCacheSize <= cacheAllocSize);
//If _cacheAllocSize increased during our call to GetCacheMemoryRemaining by another thread,
//use the newer value. If another thread increases the value of _cacheAllocSize while we
//are inside Math.Max, _cacheAllocSize will be set to a value smaller than the actual allocation
//size. This just means there is a slight chance that we might end up doing a redundant call
//to VirtualQuery() later, but the correctness of the program is not affected.
_cacheAllocSize = Math.Max(cacheAllocSize, _cacheAllocSize);
}
//Internal cache size is ok, so create the CheckedPointer for our mapping
return new CheckedPointer(mapping, currentCacheSize);
}
}
}
//Returns the number of bytes available for the current cache
//starting from the given pointer, which may lie anywhere in the middle
//of the cache. ptr need not be aligned on a page boundary.
///
/// Critical - uses unsafe code blocks.
///
[SecurityCritical]
private unsafe int GetCacheMemoryRemaining(byte* ptr)
{
VirtualQueryClass.MemoryBasicInformation mbi;
VirtualQueryClass.VirtualQuery(ptr, out mbi);
//These assertions will fail if ptr is not part of the font cache
Invariant.Assert(mbi.AllocationBase == _mfile.PositionPointer);
Invariant.Assert((mbi.AllocationProtect == VirtualQueryClass.PageReadOnly) ||
(mbi.AllocationProtect == VirtualQueryClass.PageReadWrite));
Invariant.Assert(mbi.State == VirtualQueryClass.MemCommit);
Invariant.Assert(mbi.Type == VirtualQueryClass.MemMapped);
//Now, compute the memory remaining
int offsetIntoPage = (int)(ptr - (byte*)mbi.BaseAddress);
return ((int)mbi.RegionSize) - offsetIntoPage;
}
}
///
/// Critical - calls critical code, communicates with the font cache service, exposes font data.
///
[SecurityCritical(SecurityCriticalScope.Everything)]
internal static class CacheManager
{
// Disable Presharp warning about Dispose() not being called on the disposable FileMapping object.
// This is by design, because lifetime of m extends this function - the pointer is passed to ElementCacher ctor.
#pragma warning disable 6518
private static ElementCacher OpenServerCache(string serverSectionName)
{
// Disable Presharp warning about empty catch body.
// This is by design, as we should continue even in case of server connection failures.
#pragma warning disable 6502
try
{
// open cache
FileMapping m = new FileMapping();
m.OpenSection(serverSectionName);
ElementCacher c = new ElementCacher(m, false, true);
if (c.VersionUpToDate())
{
_serverCache = c;
return c;
}
}
// This can be thrown when for some reason we cannot connect to the server.
catch (IOException)
{
}
return null;
#pragma warning restore 6502
}
internal static ElementCacher GetServerCache()
{
// the current cache is up to date
if (_serverCache != null && !_serverCache.IsObsolete())
return _serverCache;
// we know that connecting to the service will likely fail
if (!_tryToConnect)
return _serverCache;
lock (_sharedCacheLock)
{
// repeat the checks from above within the lock
if (_serverCache != null && !_serverCache.IsObsolete())
return _serverCache;
if (!_tryToConnect)
return _serverCache;
if (_fc == null)
{
_fc = FontCacheConfig.Current;
_ipcMngr = new IPCCacheManager(_fc);
}
int errorCode = 0;
string serverSectionName = null;
if (_serverCache != null)
{
// Server port is open, but the cache is obsolete. Get a new section name.
Debug.Assert(_serverCache.IsObsolete());
Debug.Assert(_ipcMngr.IsConnected);
Debug.WriteLine("Retrieving cache name from server");
//Ignore error code, just let serverSectionName be null if error.
serverSectionName = _ipcMngr.GetServerSectionName(_fc.SecondConnectTimeout, out errorCode);
}
else
{
//Connect to the server and get the server cache
int[] timeouts = { _fc.FirstConnectTimeout, _fc.SecondConnectTimeout };
for (int i = 0; ; i++)
{
//If we had an old connection lying around close it and get rid of it
if (_ipcMngr.IsConnected)
{
_ipcMngr.CloseConnection();
}
//Get the server name. If we're not connected, connect.
serverSectionName = _ipcMngr.GetServerSectionName(timeouts[i], out errorCode);
//If we succeeded, we can stop here
if (serverSectionName != null)
break;//success
if ((i + 1) >= timeouts.Length)
break;//all attempts exhausted - give up
//If we failed, it could be because the font cache service isn't running,
//so try to start it now. Don't waste time with this if we fail for another reason.
if (errorCode == _ipcMngr.ServerNotFoundErrorCode)
{
if (_fc.RestartServiceOnError)
{
if (!ServiceOps.StartServiceWithTimeout(BuildInfo.FontCacheServiceName,_fc.ServerStartTimeout))
{
//could not start service - give up
break;
}
}
else
break;//restart service option not set
}
else
{
break;//no point in continuing
}
}
}
if (serverSectionName == null)
{
// keep using the old cache if the new name can't be obtained (or null if there is no old cache)
_ipcMngr.CloseConnection();
_tryToConnect = false;
return _serverCache;
}
//Attempt to open the cache. Update _serverCache if successful,
//but keep using the old cache if there is an error.
ElementCacher c = OpenServerCache(serverSectionName);
if (c != null)
_serverCache = c;
else
{
// low memory conditions, don't attempt to connect, but keep using the old cache
_tryToConnect = false;
}
return _serverCache;
}
}
internal static ElementCacher GetCurrentCache()
{
ElementCacher c = _currentCache;
if (c == null || c.IsObsolete())
c = RenewCache(c);
Debug.Assert(c != null);
return c;
}
internal static ElementCacher RenewCache(ElementCacher oldCache)
{
lock (_clientCacheLock)
{
// If another thread has already updated the cache, we don't need to renew.
if (_currentCache != oldCache)
return _currentCache;
// The size of the new cache.
int newCacheSize;
// Whether to copy the contents of the old cache into the new cache.
bool copyOldCache = false;
if (oldCache == null)
newCacheSize = FontCacheConstants.InitialLocalCacheSize;
else
{
newCacheSize = oldCache.MaxCacheSize * FontCacheConstants.CacheGrowthFactor;
if (newCacheSize > FontCacheConstants.MaximumLocalCacheSize)
newCacheSize = FontCacheConstants.MaximumLocalCacheSize;
else
copyOldCache = true;
}
// Current client cache either doesn't exist or it is obsolete,
// create a new one.
FileMapping m = new FileMapping();
m.Create(null, newCacheSize);
ElementCacher c = new ElementCacher(m, true, false);
if (copyOldCache)
{
// Copy the bits from the old cache.
Debug.Assert(newCacheSize > oldCache.CurrentSize);
c.InitFromPreviousCache(oldCache, newCacheSize);
}
// Flush the cache before exposing it, so that clients have a consistent view of it
Thread.MemoryBarrier();
_currentCache = c;
if (oldCache != null)
oldCache.MarkObsolete();
return c;
}
}
#pragma warning restore 6518
internal static void SaveNativeCache(ElementCacher c, IList nativeCaches)
{
int count = nativeCaches.Count;
if (count > 0 && c == nativeCaches[count - 1])
return; // it's already stored, so don't bother
nativeCaches.Add(c);
}
internal static void SendMissReport(IFontCacheElement e)
{
Debug.Assert(!e.IsAppSpecific);
_ipcMngr.SendMissReport(e);
}
internal static void Lookup(IFontCacheElement e)
{
ElementCacher c;
if (!e.IsAppSpecific)
{
c = GetServerCache();
if (c != null)
{
if (c.ReadOnlyLookup(e))
return;
EventTrace.NormalTraceEvent(EventTraceGuidId.FONTCACHELIMITGUID, EventType.Info);
}
else
{
EventTrace.NormalTraceEvent(EventTraceGuidId.FONTCACHELIMITGUID, EventType.Info);
}
}
c = GetCurrentCache();
for (; ; )
{
try
{
if (!c.LookupAndAdd(e) && !e.IsAppSpecific)
{
// send a miss report if we had to add a new element
SendMissReport(e);
}
return;
}
catch (FontCacheFullException)
{
EventTrace.NormalTraceEvent(EventTraceGuidId.FONTCACHELIMITGUID, EventType.Info);
}
// Cache overflow, start a new cache and attempt element construction again.
c = RenewCache(c);
}
}
//--------------------------------//
// Private Fields //
//--------------------------------//
#region Private Fields
private static object _sharedCacheLock = new object();
private static FontCacheConfig _fc = null;
private static IPCCacheManager _ipcMngr = null;
private static volatile ElementCacher _serverCache;
// this will be set to false if we decide that FontCacheService is in a bad state
private static volatile bool _tryToConnect = true;
// client cache
private static object _clientCacheLock = new object();
private static volatile ElementCacher _currentCache;
#endregion Private Fields
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//----------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//
// Description: Core font cache logic.
//
//---------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Security.Permissions;
using System.Security;
using System.Threading;
using System.Windows;
using System.Windows.Threading;
using MS.Internal;
using MS.Utility;
using MS.Win32;
using MS.Internal.PresentationCore;
using Microsoft.Internal;
// Since we disable PreSharp warnings in this file, we first need to disable warnings about unknown message numbers and unknown pragmas.
#pragma warning disable 1634, 1691
namespace MS.Internal.FontCache
{
///
/// FontCacheFullException is raised when the cache limit is reached
///
[FriendAccessAllowed]
internal class FontCacheFullException : ApplicationException
{
internal FontCacheFullException()
{}
}
///
/// An abstract entity stored in the cache
/// The layout is following:
/// 4 byte offset of next element
/// 4 byte element type
/// Everything else is element-specific
///
[FriendAccessAllowed]
internal interface IFontCacheElement
{
///
/// Matches this element with the one in the cache
///
/// Pointer to the element in the cache to compare with.
///
/// GetData is called when the element is found in cache
///
void GetData(CheckedPointer p, ElementCacher cacher);
///
/// AddToCache is called to add the element to cache
///
void AddToCache(CheckedPointer p, ElementCacher cacher);
///
/// Returns the number of bytes that ElementCacher should allocate for the element
///
int Size
{
get;
}
///
/// Integer value unique for the element
///
int Type
{
get;
}
///
/// Returns whether the font cache element is application specific and should not be looked for in the shared cache.
///
bool IsAppSpecific
{
get;
}
///
/// Elements must override default GetHashCode(), because different instances of otherwise identical elements
/// should map to the same hash code.
/// Important note - please avoid using standard CLR GetHashCode() calls in your GetHashCode() implementations,
/// as they may return different results depending on the target platform (32 bit vs. 64 bit).
/// Use HashFn helpers instead.
///
int GetHashCode();
///
/// Writes the element key into a memory block to be sent to the font cache service.
///
void StoreKey(CheckedPointer d, out int realSize);
///
/// Initializes the element using the element key from an input memory block.
///
void RetrieveKey(CheckedPointer s);
};
///
/// ElementCacher - manages cache lookup logic
/// Layout of the cache file
/// - fixed size hash table, 4 bytes per element
/// - user data pool, active length is variable, maximum length is determined by the font cache file size
///
[FriendAccessAllowed]
internal unsafe class ElementCacher
{
private const int numberOfBuckets = 512;
// offset should be at least 4 byte aligned
private const int offMarker = 0;
private const int offMaxSize = 4;
private const int offCurSize = 8;
private const int offVersion = 12;
internal const int offHashTable = 64;//used by HashTable class
private const int MinCacheSize = offHashTable + numberOfBuckets * 4;
[StructLayout(LayoutKind.Explicit, Size = 12)]
private struct CacheHeader
{
[FieldOffset(offMarker)]
internal int Marker;
[FieldOffset(offMaxSize)]
internal int MaxSize;
[FieldOffset(offCurSize)]
internal int CurSize;
}
// when changing cache or element layout, increment the value stored in this string
private const string _cacheVersionString = @"76";
private object _cacheLock = new Object();
private FileMapping _mfile;
private bool _shared;
private HashTable _hashTable;
//The allocated size of the cache, as determined by the most recent call to GetCacheMemoryRemaining().
//Since the cache size can never decrease, we know that at least this many bytes have been allocated
//for the cache, even if this value is out of date. Saving this value allows us to omit redundant
//calls to VirtualQuery().
//
//Note: _cacheAllocSize should be used instead of _mfile.Length because _cacheAllocSize
//updates itself inside the getter of Mapping if the cache grows; _mfile.Length does not
//get updated.
private volatile int _cacheAllocSize = 0;
//Returns a pointer the cache header, without bounds-checking
///Critical - accesses cache and returns a pointer
[SecurityCritical]
private unsafe CacheHeader* UnsafeGetCacheHeader()
{
return (CacheHeader*)(_mfile.PositionPointer);
}
//Returns CheckedPointer representing the cache version string. This is bounded
//by the start of the cache table.
///Critical - calls into critical code. TreatAsSafe - cache version is ok to give out
[SecurityCritical, SecurityTreatAsSafe]
private unsafe CheckedPointer GetVersionPointer()
{
//Bounds-checking the buffer is not necessary here since the version is part of the header
return new CheckedPointer(_mfile.PositionPointer + offVersion, offHashTable - offVersion);
}
//Returns a pointer to the cache header, assuming the cache has already been initialized
///Critical - accesses cache and returns a pointer
[SecurityCritical]
private unsafe CacheHeader* GetCacheHeader()
{
//Since the header is always in memory, Mapping.Probe() is equivlant
//to just calling the unsafe version
return UnsafeGetCacheHeader();
}
//Initializes the cache header
///Critical - calls UnsafeGetCacheHeader() and modifies the cache
[SecurityCritical]
private void InitCacheHeader(int curSize, int maxSize)
{
Util.AssertAligned8(curSize);
Util.AssertAligned8(maxSize);
Invariant.Assert(curSize >= MinCacheSize);
Invariant.Assert(maxSize >= curSize);
//First, commit the necessary memory
_mfile.Commit(MinCacheSize);
//The unsafe version is ok here since we just committed the memory. It is also
//mandatory because the safe version would throw ArgumentOutOfRangeException
//as the size has not been initialized yet
CacheHeader* header = UnsafeGetCacheHeader();
header->Marker = 0;
header->CurSize = curSize;
header->MaxSize = maxSize;
}
///
/// Critical: This code serves as an entry point to unsafe code Also it initializes the server cache filemapping
/// object which should not be null or spoofed
///
[SecurityCritical]
internal ElementCacher(FileMapping mfile, bool create, bool shared)
{
_mfile = mfile;
_shared = shared;
if (create)
{
//First, initialize the cache header; then, create the hash table.
InitCacheHeader(MinCacheSize, (int)_mfile.Capacity);
SetNew();
SetVersion();
_hashTable = new HashTable(this, numberOfBuckets);
_hashTable.Init();
// flush the cache so that clients have a consistent view of it
Thread.MemoryBarrier();
}
else
{
//Cache data is already initialized and committed to memory,
//so all we have to do is just initialize the hash table
_hashTable = new HashTable(this, numberOfBuckets);
}
}
~ElementCacher()
{
((IDisposable)_mfile).Dispose();
}
///
/// Specifies whether ElementCacher corresponds to an instance of shared cache.
/// Elements such as FamilyCollection perform error handling differently if they operate on the shared cache.
///
public bool IsShared
{
get
{
return _shared;
}
}
///
/// Critical: Calls into critical code which is unsafe to do string copy
/// TreatAsSafe: Ok to call since this sets version
///
[SecurityCritical,SecurityTreatAsSafe]
private void SetVersion()
{
Util.StringCopyToCheckedPointer(GetVersionPointer(), _cacheVersionString);
}
///
/// Critical:This code calls into _mapping which is a byte *
/// TreatAsSafe: This code is safe to expose
///
[SecurityCritical,SecurityTreatAsSafe]
internal bool VersionUpToDate()
{
return Util.StringEqual(GetVersionPointer(), _cacheVersionString);
}
///
/// Critical: This code calls GetCacheHeader, which returns a pointer
/// TreatAsSafe: get() accessor doesn't change anything and cache is always allocated to include the header
///
internal int MaxCacheSize
{
[SecurityCritical,SecurityTreatAsSafe]
get
{
return GetCacheHeader()->MaxSize;
}
[SecurityCritical]
set
{
GetCacheHeader()->MaxSize = value;
}
}
///
/// Critical: This code yieds unverifiable code
/// TreatAsSafe: Get is safe - doesn't change anything
///
internal int CurrentSize
{
[SecurityCritical,SecurityTreatAsSafe]
get
{
return GetCacheHeader()->CurSize;
}
}
///
/// Critical: This code yieds unverifiable code
/// TreatAsSafe: This operation is safe
///
[SecurityCritical,SecurityTreatAsSafe]
internal void SetNew()
{
GetCacheHeader()->Marker = 0;
}
///
/// Critical: This code yieds unverifiable code
/// TreatAsSafe: Marking this as obsolete is a safe operation
///
[SecurityCritical,SecurityTreatAsSafe]
internal void MarkObsolete()
{
GetCacheHeader()->Marker = 1;
}
///
/// Critical: This code does unsafe pointer manipulation
/// TreatAsSafe: This information is ok to give out
///
[SecurityCritical,SecurityTreatAsSafe]
internal bool IsObsolete()
{
return GetCacheHeader()->Marker != 0;
}
///
/// Critical: This code does unsafe pointer manipulations, and the input parameter may cause spoofing or overrun.
///
[SecurityCritical]
internal void InitFromCacheImage(CheckedPointer cacheImage)
{
if (cacheImage.Size < MinCacheSize ||
(cacheImage.Size % 8) != 0 ||
cacheImage.Size > MaxCacheSize)
{
// Malformed input cache, just return. Assert in debug builds to catch possible bugs.
Debug.Assert(false);
return;
}
int oldCurrentSize;
unsafe
{
// Validate the current size field in the existing cache image.
oldCurrentSize = *(int*)cacheImage.Probe(offCurSize, sizeof(int));
}
if (Util.Align8(oldCurrentSize) != oldCurrentSize || oldCurrentSize != cacheImage.Size)
{
// Malformed input cache, just return. Assert in debug builds to catch possible bugs.
Debug.Assert(false);
return;
}
_mfile.Commit(cacheImage.Size);
GetCacheHeader()->CurSize = cacheImage.Size;
cacheImage.CopyTo(Mapping);
// This can happen only if the current cache size field was not set properly in the cache image,
// and we should have caught this situation earlier in this function.
Invariant.Assert(CurrentSize == cacheImage.Size);
SetNew();
}
///
/// Critical: This code does unsafe pointer manipulations, and the input parameter may cause spoofing or overrun.
///
[SecurityCritical]
internal void InitFromPreviousCache(ElementCacher oldCache, int newCacheSize)
{
// We need to lock the old cache to make sure it's CurrentSize is not updated in the middle of the copy.
lock (oldCache.Lock)
{
InitFromCacheImage(oldCache.Mapping);
// Reset max cache size to the new size, because InitFromCacheImage overwrote it.
MaxCacheSize = newCacheSize;
}
}
///
/// Note: we use _mapping + offset directly instead of this indexer
/// in cases when CurrentSize property is not set yet
///
///
/// Critical: This code yield unverifiable code which triggers a demand
/// It also returns a pointer.
///
internal unsafe byte* this[int offset]
{
[SecurityCritical]
get
{
Invariant.Assert(offset != Util.nullOffset);
Invariant.Assert(0 <= offset && offset <= CurrentSize); // Note: offset==CurrentSize for zero length arrays
// Eventually we plan to switch everything to CheckedPointer,
// and this unsafe probe will go away. For now we rely on caller to
// specify correct buffer sizes when manipulating values returned from this[int].
return (byte*)(Mapping.Probe(offset, 0));
}
}
///
/// Critical: This code yield unverifiable code which triggers a demand
///
internal int this[byte* pointer]
{
[SecurityCritical]
get
{
long longRes = Mapping.OffsetOf(pointer);
int intRes = (int)longRes;
Invariant.Assert(longRes == intRes);
return intRes;
}
}
///
/// Critical: This code does unsafe pointer manipulation
/// TreatAsSafe: This code returns a checked pointer, getting to the data in it is critical
/// This acts like a container for the critical pointer and is all safe unless one
/// extracts the pointer
///
[SecurityCritical,SecurityTreatAsSafe]
internal CheckedPointer GetCheckedPointer(int offset)
{
Invariant.Assert(offset != Util.nullOffset && offset <= CurrentSize);
return Mapping + offset;
}
internal object Lock
{
get
{
return _cacheLock;
}
}
///
/// Allocates 8 byte aligned data from _mfile.
/// Throws FontCacheFullException if we are out of space
///
///
///
/// Critical: This code yield unverifiable code which triggers a demand
/// TreatAsSafe: This code allocates memory for the cacher and is safe
///
[SecurityCritical,SecurityTreatAsSafe]
internal int Alloc(int size)
{
Invariant.Assert(size >= 0);
// If the requested size is zero, we can return any offset within the file.
if (size == 0)
return 0;
lock(_cacheLock)
{
int oldSize = CurrentSize;
Util.AssertAligned8(oldSize);
int newSize = Util.Align8(oldSize + size);
Invariant.Assert(newSize > oldSize);
if (newSize > MaxCacheSize)
throw new FontCacheFullException();
//commit the memory for the new data
_mfile.Commit(newSize);
//Now, update the size entry in the cache header
GetCacheHeader()->CurSize = newSize;
Thread.MemoryBarrier();
return oldSize;
}
}
///
/// IFontCacheElement lookup
///
///
/// Adds the element if it doesn't exist in the cache.
/// Can be called only if caller is on the same side as cache construction (e.g. client-client).
/// Thread safe.
/// Throws FontCacheFullException in case of cache overflow
/// Returns whether the element already existed in the cache.
///
/// Critical: This code adds a font cache element to the hashtable
/// TreatAsSafe: This code is safe to expose since it simply adds an element to the cache
///
[SecurityCritical,SecurityTreatAsSafe]
internal bool LookupAndAdd(IFontCacheElement e)
{
return _hashTable.Lookup(e, true);
}
///
/// IFontCacheElement read-only lookup
///
///
/// Thread safe.
/// Returns whether the element was found in the cache.
///
/// Critical: This code yields unverifiable code which triggers a demand
/// TreatAsSafe: This information is ok to return
///
[SecurityCritical,SecurityTreatAsSafe]
internal bool ReadOnlyLookup(IFontCacheElement e)
{
return _hashTable.Lookup(e, false);
}
///
/// Critical - uses unsafe code blocks, performs pointer manipulation, and calls VirtualQuery() and CheckedPointer constructor
/// TreatAsSafe: Returned pointer is guaranteed to fall within the bounds of memory allocated for the cache.
///
internal CheckedPointer Mapping
{
[SecurityCritical, SecurityTreatAsSafe]
get
{
unsafe
{
//The size of the CheckedPointer buffer will be equal to the size of the cache,
//as contained in the mapping itself.
//To prevent corrupt cache data from causing buffer overflows, we check the cache size
//against the maximum cache size and number of bytes actually allocated for the cache.
//An Invariant.Assert() will be triggered if the cache size extends past the cache buffer.
//If the cache size field is larger than the actual cache size, but smaller than the cache buffer
//size, we are ok because this excess space is not being used for anything else and if it exposes
//corrupt internal offsets, we will eventually have a CheckedPointer ArgumentOutOfRangeException, rather
//than buffer overflow.
//Since FileMapping objects are guarenteed to be at least one page long, overflowing
//the buffer while accessing the font cache header information is not possible.
byte* mapping = _mfile.PositionPointer;
int currentCacheSize = *((int*)(mapping + offCurSize));
int maxCacheSize = *((int*)(mapping + offMaxSize));
Invariant.Assert(currentCacheSize <= maxCacheSize);
//Generate a local copy in case another thread changes _cacheAllocSize in this section
int cacheAllocSize = _cacheAllocSize;
if (currentCacheSize > cacheAllocSize)
{
//Verify that the cache has grown to accomodate the additional space.
int bytesRemaining = GetCacheMemoryRemaining(mapping + cacheAllocSize);
cacheAllocSize += bytesRemaining;
Invariant.Assert(currentCacheSize <= cacheAllocSize);
//If _cacheAllocSize increased during our call to GetCacheMemoryRemaining by another thread,
//use the newer value. If another thread increases the value of _cacheAllocSize while we
//are inside Math.Max, _cacheAllocSize will be set to a value smaller than the actual allocation
//size. This just means there is a slight chance that we might end up doing a redundant call
//to VirtualQuery() later, but the correctness of the program is not affected.
_cacheAllocSize = Math.Max(cacheAllocSize, _cacheAllocSize);
}
//Internal cache size is ok, so create the CheckedPointer for our mapping
return new CheckedPointer(mapping, currentCacheSize);
}
}
}
//Returns the number of bytes available for the current cache
//starting from the given pointer, which may lie anywhere in the middle
//of the cache. ptr need not be aligned on a page boundary.
///
/// Critical - uses unsafe code blocks.
///
[SecurityCritical]
private unsafe int GetCacheMemoryRemaining(byte* ptr)
{
VirtualQueryClass.MemoryBasicInformation mbi;
VirtualQueryClass.VirtualQuery(ptr, out mbi);
//These assertions will fail if ptr is not part of the font cache
Invariant.Assert(mbi.AllocationBase == _mfile.PositionPointer);
Invariant.Assert((mbi.AllocationProtect == VirtualQueryClass.PageReadOnly) ||
(mbi.AllocationProtect == VirtualQueryClass.PageReadWrite));
Invariant.Assert(mbi.State == VirtualQueryClass.MemCommit);
Invariant.Assert(mbi.Type == VirtualQueryClass.MemMapped);
//Now, compute the memory remaining
int offsetIntoPage = (int)(ptr - (byte*)mbi.BaseAddress);
return ((int)mbi.RegionSize) - offsetIntoPage;
}
}
///
/// Critical - calls critical code, communicates with the font cache service, exposes font data.
///
[SecurityCritical(SecurityCriticalScope.Everything)]
internal static class CacheManager
{
// Disable Presharp warning about Dispose() not being called on the disposable FileMapping object.
// This is by design, because lifetime of m extends this function - the pointer is passed to ElementCacher ctor.
#pragma warning disable 6518
private static ElementCacher OpenServerCache(string serverSectionName)
{
// Disable Presharp warning about empty catch body.
// This is by design, as we should continue even in case of server connection failures.
#pragma warning disable 6502
try
{
// open cache
FileMapping m = new FileMapping();
m.OpenSection(serverSectionName);
ElementCacher c = new ElementCacher(m, false, true);
if (c.VersionUpToDate())
{
_serverCache = c;
return c;
}
}
// This can be thrown when for some reason we cannot connect to the server.
catch (IOException)
{
}
return null;
#pragma warning restore 6502
}
internal static ElementCacher GetServerCache()
{
// the current cache is up to date
if (_serverCache != null && !_serverCache.IsObsolete())
return _serverCache;
// we know that connecting to the service will likely fail
if (!_tryToConnect)
return _serverCache;
lock (_sharedCacheLock)
{
// repeat the checks from above within the lock
if (_serverCache != null && !_serverCache.IsObsolete())
return _serverCache;
if (!_tryToConnect)
return _serverCache;
if (_fc == null)
{
_fc = FontCacheConfig.Current;
_ipcMngr = new IPCCacheManager(_fc);
}
int errorCode = 0;
string serverSectionName = null;
if (_serverCache != null)
{
// Server port is open, but the cache is obsolete. Get a new section name.
Debug.Assert(_serverCache.IsObsolete());
Debug.Assert(_ipcMngr.IsConnected);
Debug.WriteLine("Retrieving cache name from server");
//Ignore error code, just let serverSectionName be null if error.
serverSectionName = _ipcMngr.GetServerSectionName(_fc.SecondConnectTimeout, out errorCode);
}
else
{
//Connect to the server and get the server cache
int[] timeouts = { _fc.FirstConnectTimeout, _fc.SecondConnectTimeout };
for (int i = 0; ; i++)
{
//If we had an old connection lying around close it and get rid of it
if (_ipcMngr.IsConnected)
{
_ipcMngr.CloseConnection();
}
//Get the server name. If we're not connected, connect.
serverSectionName = _ipcMngr.GetServerSectionName(timeouts[i], out errorCode);
//If we succeeded, we can stop here
if (serverSectionName != null)
break;//success
if ((i + 1) >= timeouts.Length)
break;//all attempts exhausted - give up
//If we failed, it could be because the font cache service isn't running,
//so try to start it now. Don't waste time with this if we fail for another reason.
if (errorCode == _ipcMngr.ServerNotFoundErrorCode)
{
if (_fc.RestartServiceOnError)
{
if (!ServiceOps.StartServiceWithTimeout(BuildInfo.FontCacheServiceName,_fc.ServerStartTimeout))
{
//could not start service - give up
break;
}
}
else
break;//restart service option not set
}
else
{
break;//no point in continuing
}
}
}
if (serverSectionName == null)
{
// keep using the old cache if the new name can't be obtained (or null if there is no old cache)
_ipcMngr.CloseConnection();
_tryToConnect = false;
return _serverCache;
}
//Attempt to open the cache. Update _serverCache if successful,
//but keep using the old cache if there is an error.
ElementCacher c = OpenServerCache(serverSectionName);
if (c != null)
_serverCache = c;
else
{
// low memory conditions, don't attempt to connect, but keep using the old cache
_tryToConnect = false;
}
return _serverCache;
}
}
internal static ElementCacher GetCurrentCache()
{
ElementCacher c = _currentCache;
if (c == null || c.IsObsolete())
c = RenewCache(c);
Debug.Assert(c != null);
return c;
}
internal static ElementCacher RenewCache(ElementCacher oldCache)
{
lock (_clientCacheLock)
{
// If another thread has already updated the cache, we don't need to renew.
if (_currentCache != oldCache)
return _currentCache;
// The size of the new cache.
int newCacheSize;
// Whether to copy the contents of the old cache into the new cache.
bool copyOldCache = false;
if (oldCache == null)
newCacheSize = FontCacheConstants.InitialLocalCacheSize;
else
{
newCacheSize = oldCache.MaxCacheSize * FontCacheConstants.CacheGrowthFactor;
if (newCacheSize > FontCacheConstants.MaximumLocalCacheSize)
newCacheSize = FontCacheConstants.MaximumLocalCacheSize;
else
copyOldCache = true;
}
// Current client cache either doesn't exist or it is obsolete,
// create a new one.
FileMapping m = new FileMapping();
m.Create(null, newCacheSize);
ElementCacher c = new ElementCacher(m, true, false);
if (copyOldCache)
{
// Copy the bits from the old cache.
Debug.Assert(newCacheSize > oldCache.CurrentSize);
c.InitFromPreviousCache(oldCache, newCacheSize);
}
// Flush the cache before exposing it, so that clients have a consistent view of it
Thread.MemoryBarrier();
_currentCache = c;
if (oldCache != null)
oldCache.MarkObsolete();
return c;
}
}
#pragma warning restore 6518
internal static void SaveNativeCache(ElementCacher c, IList nativeCaches)
{
int count = nativeCaches.Count;
if (count > 0 && c == nativeCaches[count - 1])
return; // it's already stored, so don't bother
nativeCaches.Add(c);
}
internal static void SendMissReport(IFontCacheElement e)
{
Debug.Assert(!e.IsAppSpecific);
_ipcMngr.SendMissReport(e);
}
internal static void Lookup(IFontCacheElement e)
{
ElementCacher c;
if (!e.IsAppSpecific)
{
c = GetServerCache();
if (c != null)
{
if (c.ReadOnlyLookup(e))
return;
EventTrace.NormalTraceEvent(EventTraceGuidId.FONTCACHELIMITGUID, EventType.Info);
}
else
{
EventTrace.NormalTraceEvent(EventTraceGuidId.FONTCACHELIMITGUID, EventType.Info);
}
}
c = GetCurrentCache();
for (; ; )
{
try
{
if (!c.LookupAndAdd(e) && !e.IsAppSpecific)
{
// send a miss report if we had to add a new element
SendMissReport(e);
}
return;
}
catch (FontCacheFullException)
{
EventTrace.NormalTraceEvent(EventTraceGuidId.FONTCACHELIMITGUID, EventType.Info);
}
// Cache overflow, start a new cache and attempt element construction again.
c = RenewCache(c);
}
}
//--------------------------------//
// Private Fields //
//--------------------------------//
#region Private Fields
private static object _sharedCacheLock = new object();
private static FontCacheConfig _fc = null;
private static IPCCacheManager _ipcMngr = null;
private static volatile ElementCacher _serverCache;
// this will be set to false if we decide that FontCacheService is in a bad state
private static volatile bool _tryToConnect = true;
// client cache
private static object _clientCacheLock = new object();
private static volatile ElementCacher _currentCache;
#endregion Private Fields
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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- PartialTrustHelpers.cs
- SettingsPropertyValue.cs
- DataControlFieldCollection.cs
- VirtualPathProvider.cs
- SessionStateContainer.cs
- FieldNameLookup.cs
- RenderData.cs
- CodeGenerator.cs
- Rijndael.cs
- RowSpanVector.cs
- SoapAttributeAttribute.cs
- EpmHelper.cs
- WeakReference.cs
- formatter.cs
- ProfileSettings.cs
- base64Transforms.cs
- Frame.cs
- MatrixAnimationUsingPath.cs
- CanonicalFormWriter.cs
- IFlowDocumentViewer.cs
- BackStopAuthenticationModule.cs
- ResourceDescriptionAttribute.cs
- BamlBinaryReader.cs
- StorageAssociationSetMapping.cs
- WinFormsSecurity.cs
- CompilerHelpers.cs
- ActivationWorker.cs
- XPathParser.cs
- ConfigurationElementProperty.cs
- FontFamily.cs
- GridEntry.cs
- GridViewColumn.cs
- XhtmlBasicCommandAdapter.cs
- DataGridViewElement.cs
- TcpSocketManager.cs
- TextTreeTextElementNode.cs
- TypeReference.cs
- AbandonedMutexException.cs
- SwitchElementsCollection.cs
- WsdlServiceChannelBuilder.cs
- WhiteSpaceTrimStringConverter.cs
- PrintPreviewDialog.cs
- PropertyInformation.cs
- StartUpEventArgs.cs
- SqlGenericUtil.cs
- log.cs
- StrokeCollection.cs
- CultureSpecificCharacterBufferRange.cs
- GradientSpreadMethodValidation.cs
- QilDataSource.cs
- DataViewListener.cs
- ProtocolElement.cs
- SolidColorBrush.cs
- XPathQueryGenerator.cs
- XmlSchemaAnnotated.cs
- DeferredElementTreeState.cs
- Constants.cs
- RichTextBoxConstants.cs
- RowBinding.cs
- Encoding.cs
- HtmlInputText.cs
- lengthconverter.cs
- ManualResetEvent.cs
- TemplateBamlTreeBuilder.cs
- GPStream.cs
- TextEditorSelection.cs
- HorizontalAlignConverter.cs
- TableLayoutPanel.cs
- Timeline.cs
- NeutralResourcesLanguageAttribute.cs
- PolyQuadraticBezierSegment.cs
- TextProperties.cs
- SamlAuthorizationDecisionClaimResource.cs
- ResourceExpressionBuilder.cs
- LingerOption.cs
- NotCondition.cs
- ParallelLoopState.cs
- PresentationSource.cs
- RequestSecurityTokenSerializer.cs
- TextRangeEditTables.cs
- Point.cs
- CodeBinaryOperatorExpression.cs
- SharedUtils.cs
- DataGridViewUtilities.cs
- MemoryRecordBuffer.cs
- Semaphore.cs
- UInt32Converter.cs
- PermissionToken.cs
- Triplet.cs
- ManipulationVelocities.cs
- objectresult_tresulttype.cs
- CatalogPartCollection.cs
- Types.cs
- StartUpEventArgs.cs
- TableItemPatternIdentifiers.cs
- Rule.cs
- CalendarKeyboardHelper.cs
- Zone.cs
- CodeValidator.cs
- ConvertEvent.cs