Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Shared / MS / Internal / MimeTypeMapper.cs / 1305600 / MimeTypeMapper.cs
using System; using System.Collections; using System.Collections.Generic; using System.Globalization; using System.IO; using System.Security; using System.Security.Permissions; using System.Text; #if PRESENTATION_CORE using MS.Internal.PresentationCore; // for FriendAccessAllowed and BindUriHelper.UriToString #else #error Class is being used from an unknown assembly. #endif namespace MS.Internal { [FriendAccessAllowed] internal static class MimeTypeMapper { static internal ContentType GetMimeTypeFromUri(Uri uriSource) { ContentType mimeType = ContentType.Empty; if (uriSource != null) { Uri uri = uriSource; if (uri.IsAbsoluteUri == false) { uri = new Uri("http://foo/bar/"); uri = new Uri(uri, uriSource); } string completeExt = GetFileExtension(uri); lock (((ICollection)_fileExtensionToMimeType).SyncRoot) { // initialize for the first time if (_fileExtensionToMimeType.Count == 0) { // Adding the known mime types to the hash table. _fileExtensionToMimeType.Add(XamlExtension, XamlMime); _fileExtensionToMimeType.Add(BamlExtension, BamlMime); _fileExtensionToMimeType.Add(JpgExtension, JpgMime); _fileExtensionToMimeType.Add(XbapExtension, XbapMime); } if (!_fileExtensionToMimeType.TryGetValue(completeExt, out mimeType)) { // // If the hashtable doesn't contain the MimeType for this extension, // Call UrlMon API to get it, once UrlMon API returns a vallid MimeType, // update it into the hashtable, so that the next time query for a Uri // with the same extension will be faster. // mimeType = GetMimeTypeFromUrlMon(uriSource); if (mimeType != ContentType.Empty) { _fileExtensionToMimeType.Add(completeExt, mimeType); } } } } return mimeType; } // // Call UrlMon API to get MimeType for a given extension. // ////// SecurityCritical: uses UnsafeNativeMethods FindMimeFromData /// SecurityTreatAsSafe: /// The information returned is the mime-type associated with /// the extension at the end of the Uri /// Considered safe information to expose. /// [SecurityCritical,SecurityTreatAsSafe] static private ContentType GetMimeTypeFromUrlMon(Uri uriSource) { ContentType mimeType = ContentType.Empty; if (uriSource != null) { int retValue; string mimeTypeString; retValue = MS.Win32.Compile.UnsafeNativeMethods.FindMimeFromData(null, BindUriHelper.UriToString( uriSource ) , IntPtr.Zero, 0, null, 0, out mimeTypeString, 0); // For PreSharp 56031, // This return value must be checked as the function // will not throw an exception on failure. // the expected return value is S_OK. if (retValue == 0 && mimeTypeString != null) { mimeType = new ContentType(mimeTypeString); } } return mimeType; } static private string GetDocument(Uri uri) { string docstring; if (uri.IsFile) { // LocalPath will un-escape characters, convert a file:/// // URI back into a local file system path. It will also // drop any post-pended characters. (rogerch) // // "file:///c:/Program%20Files/foo.xmf#bar.jpg" // becomes // "C:\Program Files\foo.xmf" docstring = uri.LocalPath; } else { // When not using the file scheme, escaped characters need // to stay there and we rely on the Uri class to take care // of figuring out what's going on. docstring = uri.GetLeftPart(UriPartial.Path); } return docstring; } static internal string GetFileExtension(Uri uri) { string docString = GetDocument(uri); string extensionWithDot = Path.GetExtension(docString); string extension = String.Empty; if (String.IsNullOrEmpty(extensionWithDot) == false) { extension = extensionWithDot.Substring(1).ToLower(CultureInfo.InvariantCulture); } return extension; } static internal bool IsHTMLMime(ContentType contentType) { return (HtmlMime.AreTypeAndSubTypeEqual(contentType) || HtmMime.AreTypeAndSubTypeEqual(contentType)); } // The initial size of the hashtable mapps to the initial Known mimetypes. // If more known mimetypes are added later, please change this number also // for better perf. private static readonly Dictionary_fileExtensionToMimeType = new Dictionary (4); // Unspported MIME type internal static readonly ContentType OctetMime = new ContentType("application/octet-stream"); internal static readonly ContentType TextPlainMime = new ContentType("text/plain"); // Known file extensions internal const string XamlExtension = "xaml"; internal const string BamlExtension = "baml"; internal const string XbapExtension = "xbap"; internal const string JpgExtension = "jpg"; // Supported MIME types: internal static readonly ContentType XamlMime = new ContentType("application/xaml+xml"); internal static readonly ContentType BamlMime = new ContentType("application/baml+xml"); internal static readonly ContentType JpgMime = new ContentType("image/jpg"); internal static readonly ContentType IconMime = new ContentType("image/x-icon"); internal static readonly ContentType FixedDocumentSequenceMime = new ContentType("application/vnd.ms-package.xps-fixeddocumentsequence+xml"); internal static readonly ContentType FixedDocumentMime = new ContentType("application/vnd.ms-package.xps-fixeddocument+xml"); internal static readonly ContentType FixedPageMime = new ContentType("application/vnd.ms-package.xps-fixedpage+xml"); internal static readonly ContentType ResourceDictionaryMime = new ContentType("application/vnd.ms-package.xps-resourcedictionary+xml"); internal static readonly ContentType HtmlMime = new ContentType("text/html"); internal static readonly ContentType HtmMime = new ContentType("text/htm"); internal static readonly ContentType XbapMime = new ContentType("application/x-ms-xbap"); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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