Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / AppModel / ResourcePart.cs / 1305600 / ResourcePart.cs
//------------------------------------------------------------------------------ // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // ResourcePart is an implementation of the abstract PackagePart class. It contains an override for GetStreamCore. // // History: // 10/04/2004: [....]: Initial creation. // //----------------------------------------------------------------------------- using System; using System.IO.Packaging; using System.Windows; using System.Windows.Resources; using System.IO; using System.Resources; using System.Globalization; using System.Security; using MS.Internal.Resources; using MS.Internal; //In order to avoid generating warnings about unknown message numbers and //unknown pragmas when compiling your C# source code with the actual C# compiler, //you need to disable warnings 1634 and 1691. (Presharp Documentation) #pragma warning disable 1634, 1691 namespace MS.Internal.AppModel { ////// ResourcePart is an implementation of the abstract PackagePart class. It contains an override for GetStreamCore. /// internal class ResourcePart : System.IO.Packaging.PackagePart { //----------------------------------------------------- // // Public Constructors // //----------------------------------------------------- #region Public Constructors ////// Critical - because _rmWrapper, which is being set, is marked SecurityCriticalDataForSet. /// [SecurityCritical] public ResourcePart(Package container, Uri uri, string name, ResourceManagerWrapper rmWrapper) : base(container, uri) { if (rmWrapper == null) { throw new ArgumentNullException("rmWrapper"); } _rmWrapper.Value = rmWrapper; _name = name; } #endregion //------------------------------------------------------ // // Protected Methods // //----------------------------------------------------- #region Protected Methods ////// Critical - because creating a BamlStream is critical as it stores the assembly /// passed in to it the _assembly field, and this field is used by the /// BamlRecordReader to allow legitimate internal types in Partial Trust. /// Safe - because the _rmWrapper from which the assembly is obtained is SecurityCriticalDataForSet, /// and setting that when a ResourcePart is constructed is treated as safe by /// ResourceContainer.GetPartCore(). The _rmWrapper is trated as safe as it guarantees /// that any stream created by it is always from the assembly that it also holds on to. /// So to the BamlRecordReader, this Assembly that it uses is always guaranteed to be /// the one from which the baml stream that it reads, was created from. /// [SecurityCritical, SecurityTreatAsSafe] protected override Stream GetStreamCore(FileMode mode, FileAccess access) { Stream stream = null; stream = EnsureResourceLocationSet(); // in order to find the resource we might have to open a stream. // rather than waste the stream it is returned here and we can use it. if (stream == null) { // Start looking for resources using the current ui culture. // The resource manager will fall back to invariant culture automatically. stream = _rmWrapper.Value.GetStream(_name); if (stream == null) { throw new IOException(SR.Get(SRID.UnableToLocateResource, _name)); } } // // If this is a Baml stream, it will return BamlStream object, which contains // both raw stream and the host assembly. // ContentType curContent = new ContentType(ContentType); if (MimeTypeMapper.BamlMime.AreTypeAndSubTypeEqual(curContent)) { BamlStream bamlStream = new BamlStream(stream, _rmWrapper.Value.Assembly); stream = bamlStream; } return stream; } protected override string GetContentTypeCore() { EnsureResourceLocationSet(); return MS.Internal.MimeTypeMapper.GetMimeTypeFromUri(new Uri(_name,UriKind.RelativeOrAbsolute)).ToString(); } #endregion //------------------------------------------------------ // // Private Methods // //------------------------------------------------------ #region Private Methods private Stream EnsureResourceLocationSet() { Stream stream = null; lock (_globalLock) { // only need to do this once if (_ensureResourceIsCalled) { return null; } _ensureResourceIsCalled = true; try { // We do not allow the use of .baml in any Avalon public APIs. This is the code pass needed to go through for loading baml file. // Throw here we will catch all those cases. if (String.Compare(Path.GetExtension(_name), ResourceContainer.BamlExt, StringComparison.OrdinalIgnoreCase) == 0) { throw new IOException(SR.Get(SRID.UnableToLocateResource, _name)); } if (String.Compare(Path.GetExtension(_name), ResourceContainer.XamlExt, StringComparison.OrdinalIgnoreCase) == 0) { // try baml extension first since it's our most common senario. string newName = Path.ChangeExtension(_name, ResourceContainer.BamlExt); // Get resource from resource manager wrapper. stream = _rmWrapper.Value.GetStream(newName); if (stream != null) { // Remember that we have .baml for next time GetStreamCore is called. _name = newName; return stream; } } } #pragma warning disable 6502 // PRESharp - Catch statements should not have empty bodies catch (System.Resources.MissingManifestResourceException) { // When the main assembly doesn't contain any resource (all the resources must come from satellite assembly) // then above GetStream( ) just throws exception. We should catch this exception here and let the code continue // to try with the original file name. // If the main assembly does contain resource, but the resource with above _name does't exist, the above GetStream( ) // just returns null without exception. } #pragma warning restore 6502 } // Do not attempt to load the original file name here. If the .baml does not exist or if this resource not // .xaml or .baml then we will follow the normal code path to attempt to load the stream using the original name. return null; } #endregion //----------------------------------------------------- // // Private Fields // //------------------------------------------------------ #region Private Members private SecurityCriticalDataForSet_rmWrapper; private bool _ensureResourceIsCalled = false; private string _name; private Object _globalLock = new Object(); #endregion Private Members } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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