Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / MS / Internal / FontCache / CachedFontFamily.cs / 1 / CachedFontFamily.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: The CachedFontFamily class // // History: // 03/04/2004 : [....] - Cache layout and interface changes for font enumeration. // //--------------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Generic; using System.ComponentModel; using System.Diagnostics; using System.Globalization; using System.IO; using System.Runtime.InteropServices; using System.Security; using System.Security.Permissions; using System.Windows; using System.Windows.Markup; // for XmlLanguage using System.Windows.Media; using MS.Win32; using MS.Utility; using MS.Internal; using MS.Internal.FontFace; namespace MS.Internal.FontCache { ////// This structure exists because we need a common wrapper for enumeration, but we can't use original cache structures: /// 1. C# doesn't allow IEnumerable/IEnumerator on pointer. /// 2. The cache structures don't inherit from base class. /// internal struct CachedFontFamily : IEnumerable{ private FamilyCollection _familyCollection; /// /// Critical: This holds reference to a pointer which is not ok to expose /// [SecurityCritical] private unsafe FamilyCollection.CachedFamily * _family; ////// Critical: Determines value of CheckedPointer.Size, which is used for bounds checking. /// [SecurityCritical] private int _sizeInBytes; ////// Critical: This stores a pointer and the class is unsafe because it manipulates the pointer; the sizeInBytes /// parameter is critical because it is used for bounds checking (via CheckedPointer) /// [SecurityCritical] public unsafe CachedFontFamily(FamilyCollection familyCollection, FamilyCollection.CachedFamily* family, int sizeInBytes) { _familyCollection = familyCollection; _family = family; _sizeInBytes = sizeInBytes; } ////// Critical: This acccesses a pointer /// TreatAsSafe: This information is ok to expose /// public bool IsNull { [SecurityCritical,SecurityTreatAsSafe] get { unsafe { return _family == null; } } } ////// Critical: This acccesses a pointer /// TreatAsSafe: This information is ok to expose /// public bool IsPhysical { [SecurityCritical,SecurityTreatAsSafe] get { unsafe { return _family->familyType == FamilyCollection.FamilyType.Physical; } } } ////// Critical: This acccesses a pointer /// TreatAsSafe: This information is ok to expose /// public bool IsComposite { [SecurityCritical,SecurityTreatAsSafe] get { unsafe { return _family->familyType == FamilyCollection.FamilyType.Composite; } } } ////// Critical: This acccesses a pointer /// TreatAsSafe: This information is ok to expose /// public string OrdinalName { [SecurityCritical,SecurityTreatAsSafe] get { unsafe { return _familyCollection.GetFamilyName(_family); } } } ////// Critical: This acccesses a pointer and returns a pointer to a structure /// public unsafe FamilyCollection.CachedPhysicalFamily* PhysicalFamily { [SecurityCritical] get { Invariant.Assert(IsPhysical); return (FamilyCollection.CachedPhysicalFamily *)_family; } } ////// Critical: This acccesses a pointer and returns a pointer to a structure /// public unsafe FamilyCollection.CachedCompositeFamily* CompositeFamily { [SecurityCritical] get { Invariant.Assert(IsComposite); return (FamilyCollection.CachedCompositeFamily *)_family; } } ////// Critical: Accesses critical fields and constructs a CheckedPointer which is a critical operation. /// TreatAsSafe: The fields used to construct the CheckedPointer are marked critical and CheckedPointer /// itself is safe to expose. /// public CheckedPointer CheckedPointer { [SecurityCritical,SecurityTreatAsSafe] get { unsafe { return new CheckedPointer(_family, _sizeInBytes); } } } public FamilyCollection FamilyCollection { get { return _familyCollection; } } ////// Critical: This acccesses a pointer /// TreatAsSafe: This information is ok to expose /// public int NumberOfFaces { [SecurityCritical,SecurityTreatAsSafe] get { unsafe { return _family->numberOfTypefaces; } } } ////// Critical: This acccesses a pointer /// TreatAsSafe: This information is ok to expose /// public double Baseline { [SecurityCritical,SecurityTreatAsSafe] get { unsafe { return _family->baseline; } } } ////// Critical: This acccesses a pointer /// TreatAsSafe: This information is ok to expose /// public double LineSpacing { [SecurityCritical, SecurityTreatAsSafe] get { unsafe { return _family->lineSpacing; } } } ////// Critical: This acccesses a pointer /// TreatAsSafe: This information is ok to expose /// public IDictionaryNames { [SecurityCritical,SecurityTreatAsSafe] get { unsafe { return _familyCollection.GetLocalizedNameDictionary(_family); } } } #region IEnumerable Members IEnumerator IEnumerable .GetEnumerator() { return new Enumerator(this); } #endregion #region IEnumerable Members IEnumerator IEnumerable.GetEnumerator() { return new Enumerator(this); } #endregion private unsafe struct Enumerator : IEnumerator { private int _currentFace; private CachedFontFamily _family; public Enumerator(CachedFontFamily family) { _family = family; _currentFace = -1; } #region IEnumerator Members /// /// Critical: This acccesses a pointer /// TreatAsSafe: This funtions moves to the next /// [SecurityCritical,SecurityTreatAsSafe] public bool MoveNext() { ++_currentFace; if (0 <= _currentFace && _currentFace < _family.NumberOfFaces) return true; _currentFace = _family.NumberOfFaces; return false; } ////// Critical: This acccesses a pointer /// TreatAsSafe: This information is ok to expose /// CachedFontFace IEnumerator.Current { [SecurityCritical,SecurityTreatAsSafe] get { return _family.FamilyCollection.GetCachedFace(_family, _currentFace); } } #endregion #region IEnumerator Members object IEnumerator.Current { get { return ((IEnumerator )this).Current; } } void IEnumerator.Reset() { _currentFace = -1; } #endregion #region IDisposable Members public void Dispose() {} #endregion } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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