Wrap non-seekable stream in XamlToRtfWriter

src/Microsoft.DotNet.Wpf/src/PresentationCore/MS/internal/IO/Packaging/DeobfuscatingStream.cs

@@ -203,7 +203,7 @@ internal DeobfuscatingStream(Stream obfuscatedStream, Uri streamUri, bool leaveO
 
             // Make sure streamUri is in the correct form; getting partUri from it will do all necessary checks for error
             //    conditions; We also have to make sure that it has a part name
-            Uri partUri = PackUriHelper.GetPartUri(streamUri);
+            Uri partUri = System.IO.Packaging.PackUriHelper.GetPartUri(streamUri);
             if (partUri == null)
             {
                 throw new InvalidOperationException(SR.Get(SRID.InvalidPartName));

src/Microsoft.DotNet.Wpf/src/PresentationCore/System/IO/Packaging/PackWebRequestFactory.cs

@@ -74,9 +74,8 @@ WebRequest IWebRequestCreate.Create(Uri uri)
 #endif
             // only inspect cache if part name is present because cache only contains an object, not
             // the stream it was derived from
-            Uri packageUri;
-            Uri partUri;
-            MS.Internal.IO.Packaging.PackUriHelper.ValidateAndGetPackUriComponents(uri, out packageUri, out partUri);
+            Uri packageUri = System.IO.Packaging.PackUriHelper.GetPackageUri(uri);
+            Uri partUri = System.IO.Packaging.PackUriHelper.GetPartUri(uri);
 
             if (partUri != null)
             {

src/Microsoft.DotNet.Wpf/src/PresentationFramework/MS/Internal/AppModel/AppModelKnownContentFactory.cs

@@ -25,8 +25,6 @@
 using System.ComponentModel;
 using System.Windows.Controls;
 
-using PackUriHelper = MS.Internal.IO.Packaging.PackUriHelper;
-
 namespace MS.Internal.AppModel
 {
     // !!!! Note: Those methods are registered as MimeObjectFactory.StreamToObjectFactoryDelegate. The caller expects the 

src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Application.cs

@@ -692,11 +692,8 @@ public static StreamResourceInfo GetRemoteStream(Uri uriRemote)
 
             Uri resolvedUri = BindUriHelper.GetResolvedUri(BaseUriHelper.SiteOfOriginBaseUri, uriRemote);
 
-            // Using PackUriHelper.ValidateAndGetPackUriComponents internal method
-            // to get Package and Part Uri in one step
-            Uri packageUri;
-            Uri partUri;
-            MS.Internal.IO.Packaging.PackUriHelper.ValidateAndGetPackUriComponents(resolvedUri, out packageUri, out partUri);
+            Uri packageUri = PackUriHelper.GetPackageUri(resolvedUri);
+            Uri partUri = PackUriHelper.GetPartUri(resolvedUri);
 
             //
             // SiteOfOriginContainer must have been added into the package cache, the code should just
@@ -2012,12 +2009,9 @@ private static PackagePart GetResourceOrContentPart(Uri uri)
             Uri packAppUri = BaseUriHelper.PackAppBaseUri;
             Uri resolvedUri = BindUriHelper.GetResolvedUri(packAppUri, uri);
 
-            // Using PackUriHelper.ValidateAndGetPackUriComponents internal method
-            // to get Package and Part Uri in one step
-            Uri packageUri;
-            Uri partUri;
-            MS.Internal.IO.Packaging.PackUriHelper.ValidateAndGetPackUriComponents(resolvedUri, out packageUri, out partUri);
-
+            Uri packageUri = PackUriHelper.GetPackageUri(resolvedUri);
+            Uri partUri = PackUriHelper.GetPartUri(resolvedUri);
+
             //
             // ResourceContainer must have been added into the package cache, the code should just
             // take use of that ResourceContainer instance, instead of creating a new instance here.

src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Documents/FixedDocument.cs

@@ -995,7 +995,7 @@ static private Uri GetStructureUriFromRelationship(Uri contentUri, string relati
             Uri absTargetUri = null;
             if (contentUri != null && relationshipName != null)
             {
-                Uri partUri = MS.Internal.IO.Packaging.PackUriHelper.GetPartUri(contentUri);
+                Uri partUri = PackUriHelper.GetPartUri(contentUri);
                 if (partUri != null)
                 {
                     Uri packageUri = PackUriHelper.GetPackageUri(contentUri);

src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Documents/XamlToRtfWriter.cs

@@ -2023,8 +2023,14 @@ private void WriteImage(DocumentNode documentNode)
             // Get image type to be added to rtf content
             RtfImageFormat imageFormat = GetImageFormatFromImageSourceName(documentNode.FormatState.ImageSource);
 
-            // Write the shape image like as "\pngblip" or "\jpegblip" rtf control
-            WriteShapeImage(documentNode, imageStream, imageFormat);
+            // Write the shape image like as "\pngblip" or "\jpegblip" rtf control. We wrap the stream that comes
+            // from the package because we require the stream to be seekable.
+            Debug.Assert(!imageStream.CanSeek);
+            using (var seekableStream = new MemoryStream((int)imageStream.Length))
+            {
+                imageStream.CopyTo(seekableStream);
+                WriteShapeImage(documentNode, seekableStream, imageFormat);
+            }
 
 #if WindowsMetaFile
             // This block is disabled because of performance.

src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Documents/XpsS0ValidatingLoader.cs

@@ -73,12 +73,9 @@ private object Load(Stream stream, Uri parentUri, ParserContext pc, ContentType
                 XpsSchema schema = XpsSchema.GetSchema(mimeType);
                 Uri uri = pc.BaseUri;
 
-                // Using PackUriHelper.ValidateAndGetPackUriComponents internal method 
-                // to get Package and Part Uri in one step
-                Uri packageUri;
-                Uri partUri;
-                InternalPackUriHelper.ValidateAndGetPackUriComponents(uri, out packageUri, out partUri);
-
+                Uri packageUri = PackUriHelper.GetPackageUri(uri);
+                Uri partUri = PackUriHelper.GetPartUri(uri);
+
                 Package package = PreloadedPackages.GetPackage(packageUri);
 
                 Uri parentPackageUri = null;