Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / MS / Internal / FontCache / ElementFactory.cs / 1 / ElementFactory.cs
//---------------------------------------------------------------------------- // // Copyright (c) Microsoft Corporation. All rights reserved. // //--------------------------------------------------------------------------- using System; using System.Diagnostics; using System.IO; using System.Net; using System.Security; using MS.Internal.PresentationCore; // 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 // Disable PreSharp warning about empty catch bodies. // We have many situations in this file where the service needs to robust against external data, // and empty catch bodies allow for uniform error handling code paths. #pragma warning disable 6502 namespace MS.Internal.FontCache { ////// Critical - The class is used by the server to construct font cache elements. /// It is unaware of what method will be used to communicate the data to the server. /// [SecurityCritical(SecurityCriticalScope.Everything)] [FriendAccessAllowed] internal static class ElementFactory { ////// Creates an element from a miss report key. Checks for errors in element construction /// that could arise if either key or font file is corrupt. Returns the element if successful /// or null to indicate an error. /// internal static IFontCacheElement CreateElementFromKey(int type, CheckedPointer key) { try { switch (type) { case 2: return new FamilyCollection(key); case 3: return new FontFaceLayoutInfo(key); case 1: return new GlyphBitmapElement(key); case 4: return new GlyphPathElement(key); default: return null; } } catch (ArgumentOutOfRangeException) { // The cache element key is malformed. } catch (UriFormatException) { // Font file Uri is malformed. } catch (IOException) { // Font file doesn't exist or cannot be read due to an I/O error. } catch (UnauthorizedAccessException) { // Font file cannot be accessed by the service account. } catch (WebException) { //This error can happen if the miss report specifies a web address for the font file. //(This is not a subclass of I/O exception). } return null; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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