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//---------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//
// Description: FontResourceCache class maintains the list of font resources included with an application.
//
//
// History:
// 08/09/2005 : mleonov - Created
//
//---------------------------------------------------------------------------
using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.IO.Packaging;
using System.Reflection;
using System.Windows.Navigation;
using MS.Internal.Resources;
namespace MS.Internal.FontCache
{
internal static class FontResourceCache
{
private static void ConstructFontResourceCache(Assembly entryAssembly, Dictionary<string, List<string>> folderResourceMap)
{
// For entryAssembly build a set of mapping from paths to entries that describe each resource.
Dictionary<string, string> contentFiles = ContentFileHelper.GetContentFiles(entryAssembly);
if (contentFiles != null)
{
foreach (string contentFile in contentFiles.Keys)
{
AddResourceToFolderMap(folderResourceMap, contentFile);
}
}
IList resourceList = new ResourceManagerWrapper(entryAssembly).ResourceList;
if (resourceList != null)
{
foreach (string resource in resourceList)
{
AddResourceToFolderMap(folderResourceMap, resource);
}
}
}
internal static List<string> LookupFolder(Uri uri)
{
// The input URI may specify a folder which is invalid for pack URIs. If so,
// create a valid pack URI by adding a fake filename.
bool isFolder = IsFolderUri(uri);
if (isFolder)
{
uri = new Uri(uri, FakeFileName);
}
// The input Uri should now be a valid absolute pack application Uri.
// The caller (FontSourceCollection) guarantees that.
// Perform a sanity check to make sure the assumption stays the same.
Debug.Assert(uri.IsAbsoluteUri && uri.Scheme == PackUriHelper.UriSchemePack && BaseUriHelper.IsPackApplicationUri(uri));
Assembly uriAssembly;
string escapedPath;
BaseUriHelper.GetAssemblyAndPartNameFromPackAppUri(uri, out uriAssembly, out escapedPath);
if (uriAssembly == null)
return null;
// If we added a fake filename to the uri, remove it from the escaped path.
if (isFolder)
{
Debug.Assert(escapedPath.EndsWith(FakeFileName, StringComparison.OrdinalIgnoreCase));
escapedPath = escapedPath.Substring(0, escapedPath.Length - FakeFileName.Length);
}
Dictionary<string, List<string>> folderResourceMap;
lock (_assemblyCaches)
{
if (!_assemblyCaches.TryGetValue(uriAssembly, out folderResourceMap))
{
folderResourceMap = new Dictionary<string, List<string>>(StringComparer.OrdinalIgnoreCase);
ConstructFontResourceCache(uriAssembly, folderResourceMap);
_assemblyCaches.Add(uriAssembly, folderResourceMap);
}
}
List<string> ret;
folderResourceMap.TryGetValue(escapedPath, out ret);
return ret;
}
/// <summary>
/// Determines if a font family URI is a folder. Folder URIs are not valid pack URIs
/// and therefore require special handling.
/// </summary>
private static bool IsFolderUri(Uri uri)
{
string path = uri.GetComponents(UriComponents.Path, UriFormat.SafeUnescaped);
return path.Length == 0 || path[path.Length - 1] == '/';
}
// Fake file name, which we add to a folder URI and then remove from the resulting
// escaped path. This is to work around the fact that pack URIs cannot be folder URIs.
// This string could be any valid file name that does not require escaping.
private const string FakeFileName = "X";
private static void AddResourceToFolderMap(Dictionary<string, List<string>> folderResourceMap, string resourceFullName)
{
// Split the resource path into a directory and file name part.
string folderName;
string fileName;
int indexOfLastSlash = resourceFullName.LastIndexOf('/');
if (indexOfLastSlash == -1)
{
// The resource is in the root directory, folderName is empty.
folderName = String.Empty;
fileName = resourceFullName;
}
else
{
folderName = resourceFullName.Substring(0, indexOfLastSlash + 1);
fileName = resourceFullName.Substring(indexOfLastSlash + 1);
}
string extension = Path.GetExtension(fileName);
bool isComposite;
if (!Util.IsSupportedFontExtension(extension, out isComposite))
return;
// We add entries for a font file to two collections:
// one is the folder containing the file, another is the file itself,
// since we allow explicit file names in FontFamily syntax
if (!folderResourceMap.ContainsKey(folderName))
folderResourceMap[folderName] = new List<string>(1);
folderResourceMap[folderName].Add(fileName);
Debug.Assert(!folderResourceMap.ContainsKey(resourceFullName));
folderResourceMap[resourceFullName] = new List<string>(1);
folderResourceMap[resourceFullName].Add(String.Empty);
}
private static Dictionary<Assembly, Dictionary<string, List<string>>> _assemblyCaches
= new Dictionary<Assembly, Dictionary<string, List<string>>>(1);
// Set the initial capacity to 1 because a single entry assembly is the most common case.
}
}
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