Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / MS / Internal / FontCache / CanonicalFontFamilyReference.cs / 1305600 / CanonicalFontFamilyReference.cs
//------------------------------------------------------------------------ // // Copyright (c) Microsoft Corporation. All rights reserved. // // Description: The CanonicalFontFamilyReference class is the internal representation of a font // family reference. "Canonical" in this case means it has a normalized form and // the location part (if any) has been resolved to an absolute URI. // // See spec at http://team/sites/Avalon/Specs/Font%20Family%20References.doc // // History: // 1-30-2006 : niklasb - Created // //----------------------------------------------------------------------- using System; using MS.Internal; using System.Security; namespace MS.Internal.FontCache { internal sealed class CanonicalFontFamilyReference { ////// Create a CanonicalFontFamilyReference given a base URI and string. /// /// Base URI used to resolve the location part, if it is relative. /// Font family reference string, in the normalized form returned /// by Util.GetNormalizedFontFamilyReference. ///Returns a new CanonicalFontFamilyReference or CanonicalFontFamilyReference.Unresolved. ////// Critical - Calls critical CanonicalFontFamilyReference ctor. /// - Makes an implicit security decision (clients may demand on a Uri based on LocationUri and EscapedFileName). /// Safe - Uses critical Util.IsReferenceToWindowsFonts to skip critical ctor call for unsafe inputs /// [SecurityCritical, SecurityTreatAsSafe] public static CanonicalFontFamilyReference Create(Uri baseUri, string normalizedString) { string locationString; string escapedFamilyName; if (SplitFontFamilyReference(normalizedString, out locationString, out escapedFamilyName)) { Uri absoluteUri = null; string fileName = null; bool resolved = false; if (locationString == null || Util.IsReferenceToWindowsFonts(locationString)) { // No location (e.g., "#Arial") or file-name-only location (e.g., "arial.ttf#Arial") fileName = locationString; resolved = true; } else { if (Uri.TryCreate(locationString, UriKind.Absolute, out absoluteUri)) { // Location is an absolute URI. Make sure it's a supported scheme. resolved = Util.IsSupportedSchemeForAbsoluteFontFamilyUri(absoluteUri); } else if (baseUri != null && Util.IsEnumerableFontUriScheme(baseUri)) { // Location is relative to the base URI. resolved = Uri.TryCreate(baseUri, locationString, out absoluteUri); } } if (resolved) { string unescapeFamilyName = Uri.UnescapeDataString(escapedFamilyName); if (fileName != null) { return new CanonicalFontFamilyReference(fileName, unescapeFamilyName); } else { return new CanonicalFontFamilyReference(absoluteUri, unescapeFamilyName); } } } return _unresolved; } ////// Represents a font family reference that could not be resolved, e.g., because of an /// invalid location or unsupported scheme. /// public static CanonicalFontFamilyReference Unresolved { get { return _unresolved; } } ////// Font family name. This string is not URI encoded (escaped). /// public string FamilyName { get { return _familyName; } } ////// If a font family reference's location part comprises a file name only (e.g., "arial.ttf#Arial") /// this property is the URI-encoded file name. In this case, the implied location of the file is /// the default Windows Fonts folder and the LocationUri property is null. In all other cases, /// this property is null. /// public string EscapedFileName { get; ////// Critical - Sets critical member that can be used to control the path fonts are loaded from. /// [SecurityCritical] private set; } ////// Gets the font location if a specific location is given; otherwise returns null indicating /// the default Windows Fonts folder. /// public Uri LocationUri { get { return _absoluteLocationUri; } } public bool Equals(CanonicalFontFamilyReference other) { return other != null && other._absoluteLocationUri == _absoluteLocationUri && other.EscapedFileName == EscapedFileName && other._familyName == _familyName; } public override bool Equals(object obj) { return Equals(obj as CanonicalFontFamilyReference); } public override int GetHashCode() { if (_absoluteLocationUri == null && EscapedFileName == null) { // Typical case where no location is specified return _familyName.GetHashCode(); } else { // Either we have a URI or a file name, never both int hash = (_absoluteLocationUri != null) ? _absoluteLocationUri.GetHashCode() : EscapedFileName.GetHashCode(); // Combine the location hash with the family name hash hash = HashFn.HashMultiply(hash) + _familyName.GetHashCode(); return HashFn.HashScramble(hash); } } ////// Critical - Sets critical member that can be used to control the path fonts are loaded from. /// [SecurityCritical] private CanonicalFontFamilyReference(string escapedFileName, string familyName) { EscapedFileName = escapedFileName; _familyName = familyName; } private CanonicalFontFamilyReference(Uri absoluteLocationUri, string familyName) { _absoluteLocationUri = absoluteLocationUri; _familyName = familyName; } private static bool SplitFontFamilyReference(string normalizedString, out string locationString, out string escapedFamilyName) { int familyNameIndex; if (normalizedString[0] == '#') { locationString = null; familyNameIndex = 1; } else { int i = normalizedString.IndexOf('#'); locationString = normalizedString.Substring(0, i); familyNameIndex = i + 1; } if (familyNameIndex < normalizedString.Length) { escapedFamilyName = normalizedString.Substring(familyNameIndex); return true; } else { escapedFamilyName = null; return false; } } private Uri _absoluteLocationUri; private string _familyName; private static readonly CanonicalFontFamilyReference _unresolved = new CanonicalFontFamilyReference((Uri)null, string.Empty); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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