/// <summary>
/// rootElement == null: Load elements, validation of root element will occur in caller by checking object type or casting
/// rootElement != null: Only perform validation, and expect rootElement at root of markup
/// </summary>
/// <param name="stream"></param>
/// <param name="parentUri"></param>
/// <param name="pc"></param>
/// <param name="mimeType"></param>
/// <param name="rootElement"></param>
/// <returns></returns>
private object Load(Stream stream, Uri parentUri, ParserContext pc, ContentType mimeType, string rootElement)
{
object obj = null;
if (!DocumentMode)
{ // Loose XAML, just check against schema, don't check content type
if (rootElement == null)
{
obj = XamlReader.Load(stream, pc);
}
}
else
{ // inside an XPS Document. Perform maximum validation
XpsSchema schema = XpsSchema.GetSchema(mimeType);
Uri uri = pc.BaseUri;
Uri packageUri = PackUriHelper.GetPackageUri(uri);
Uri partUri = PackUriHelper.GetPartUri(uri);
Package package = PreloadedPackages.GetPackage(packageUri);
Uri parentPackageUri = null;
if (parentUri != null)
{
parentPackageUri = PackUriHelper.GetPackageUri(parentUri);
if (!parentPackageUri.Equals(packageUri))
{
throw new FileFormatException(SR.Get(SRID.XpsValidatingLoaderUriNotInSamePackage));
}
}
schema.ValidateRelationships(new SecurityCriticalData <Package>(package), packageUri, partUri, mimeType);
if (schema.AllowsMultipleReferencesToSameUri(mimeType))
{
_uniqueUriRef = null;
}
else
{
_uniqueUriRef = new Hashtable(11);
}
Hashtable validResources = (_validResources.Count > 0 ? _validResources.Peek() : null);
if (schema.HasRequiredResources(mimeType))
{
validResources = new Hashtable(11);
PackagePart part = package.GetPart(partUri);
PackageRelationshipCollection requiredResources = part.GetRelationshipsByType(_requiredResourceRel);
foreach (PackageRelationship relationShip in requiredResources)
{
Uri targetUri = PackUriHelper.ResolvePartUri(partUri, relationShip.TargetUri);
Uri absTargetUri = PackUriHelper.Create(packageUri, targetUri);
PackagePart targetPart = package.GetPart(targetUri);
if (schema.IsValidRequiredResourceMimeType(targetPart.ValidatedContentType()))
{
if (!validResources.ContainsKey(absTargetUri))
{
validResources.Add(absTargetUri, true);
}
}
else
{
if (!validResources.ContainsKey(absTargetUri))
{
validResources.Add(absTargetUri, false);
}
}
}
}
XpsSchemaValidator xpsSchemaValidator = new XpsSchemaValidator(this, schema, mimeType,
stream, packageUri, partUri);
_validResources.Push(validResources);
if (rootElement != null)
{
xpsSchemaValidator.XmlReader.MoveToContent();
if (!rootElement.Equals(xpsSchemaValidator.XmlReader.Name))
{
throw new FileFormatException(SR.Get(SRID.XpsValidatingLoaderUnsupportedMimeType));
}
while (xpsSchemaValidator.XmlReader.Read())
{
;
}
}
else
{
obj = XamlReader.Load(xpsSchemaValidator.XmlReader,
pc,
XamlParseMode.Synchronous);
}
_validResources.Pop();
}
return(obj);
}
/// <summary>
/// Move iterator to the next part that has an associated filter and (re)initialize the
/// relevant filter.
/// </summary>
/// <remarks>
/// This function results in _progress and _currentFilter being updated.
/// </remarks>
private void MoveToNextFilter()
{
// Reset _isInternalFilter.
_isInternalFilter = false;
switch (_progress)
{
case Progress.FilteringNotStarted:
#region Progress.FilteringNotStarted
// Filtering not started yet. Start with core properties filter.
IndexingFilterMarshaler corePropertiesFilterMarshaler
= new IndexingFilterMarshaler(
new CorePropertiesFilter(_package.PackageProperties));
// Avoid exception on end of chunks from part filter.
corePropertiesFilterMarshaler.ThrowOnEndOfChunks = false;
_currentFilter = corePropertiesFilterMarshaler;
_currentFilter.Init(_grfFlags, _cAttributes, _aAttributes);
_isInternalFilter = true;
// Update progress to indicate filtering core properties.
_progress = Progress.FilteringCoreProperties;
break;
#endregion Progress.FilteringNotStarted
case Progress.FilteringCoreProperties:
#region Progress.FilteringCoreProperties
// Core properties were being filtered. Next move to content filtering.
#endregion Progress.FilteringCoreProperties
case Progress.FilteringContent:
#region Progress.FilteringContent
//
// Content being filtered. Move to next content part filter if it exists.
// Update progress to indicate filtering content if there is a next content
// filter, else to indicate filtering is completed.
//
if (_currentStream != null)
{
// Close the stream for the previous PackagePart.
_currentStream.Close();
_currentStream = null;
}
for (_currentFilter = null; _partIterator.MoveNext(); _currentFilter = null)
{
PackagePart currentPart = (PackagePart)_partIterator.Current;
ContentType contentType = currentPart.ValidatedContentType();
// Find the filter's CLSID based on the MIME content type.
string filterClsid = GetFilterClsid(contentType, currentPart.Uri);
if (filterClsid != null)
{
_currentFilter = GetFilterFromClsid(new Guid(filterClsid));
if (_currentFilter != null)
{
_currentStream = currentPart.GetStream();
ManagedIStream stream = new ManagedIStream(_currentStream);
try
{
IPersistStreamWithArrays filterLoader = (IPersistStreamWithArrays)_currentFilter;
filterLoader.Load(stream);
_currentFilter.Init(_grfFlags, _cAttributes, _aAttributes);
// Filter found and properly initialized. Search is over.
break;
}
catch (InvalidCastException)
{
// If a filter does not implement IPersistStream, then, by design, it should
// be ignored.
}
catch (COMException)
{
// Any initialization bug giving rise to an exception in the initialization
// code should be ignored, since this will be due to faulty external code.
}
catch (IOException)
{
// Initialization problem can be reported as IOException. See preceding comment.
}
}
}
//
// No valid externally registered filters found for this content part.
// If this is xaml part, use the internal XamlFilter.
//
if (BindUriHelper.IsXamlMimeType(contentType))
{
if (_currentStream == null)
{
_currentStream = currentPart.GetStream();
}
IndexingFilterMarshaler xamlFilterMarshaler
= new IndexingFilterMarshaler(new XamlFilter(_currentStream));
// Avoid exception on end of chunks from part filter.
xamlFilterMarshaler.ThrowOnEndOfChunks = false;
_currentFilter = xamlFilterMarshaler;
_currentFilter.Init(_grfFlags, _cAttributes, _aAttributes);
_isInternalFilter = true;
// Filter found and properly initialized. Search is over.
break;
}
if (_currentStream != null)
{
_currentStream.Close();
_currentStream = null;
}
}
if (_currentFilter == null)
{
// Update progress to indicate filtering is completed.
_progress = Progress.FilteringCompleted;
}
else
{
// Tell GetChunk that we are getting input from a new filter.
_firstChunkFromFilter = true;
// Update progress to indicate content being filtered.
_progress = Progress.FilteringContent;
}
break;
#endregion Progress.FilteringContent
case Progress.FilteringCompleted:
#region Progress.FilteringCompleted
Debug.Assert(false);
break;
#endregion Progress.FilteringCompleted
default:
#region Default
Debug.Assert(false);
break;
#endregion Default
}
}
