// Return true if an open XML document is enforcing read-only
private static bool IsOpenXMLReadOnlyEnforced(string filename)
{
// Read an OpenXML type document
using (Package package = Package.Open(path: filename, packageMode: FileMode.Open, packageAccess: FileAccess.Read))
{
if (null == package)
{
return(false);
}
try
{
// Document security is set in the extended properties
// https://docs.microsoft.com/en-us/previous-versions/office/developer/office-2010/cc845474(v%3doffice.14)
string extendedType = "http://schemas.openxmlformats.org/officeDocument/2006/relationships/extended-properties";
PackageRelationshipCollection extendedProps = package.GetRelationshipsByType(extendedType);
if (null != extendedProps)
{
IEnumerator extendedPropsList = extendedProps.GetEnumerator();
if (extendedPropsList.MoveNext())
{
Uri extendedPropsUri = PackUriHelper.ResolvePartUri(new Uri("/", UriKind.Relative), ((PackageRelationship)extendedPropsList.Current).TargetUri);
PackagePart props = package.GetPart(extendedPropsUri);
if (null != props)
{
// Read the internal docProps/app.xml XML file
XDocument xmlDoc = XDocument.Load(props.GetStream());
XElement securityEl = xmlDoc.Root.Element(XName.Get("DocSecurity", xmlDoc.Root.GetDefaultNamespace().NamespaceName));
if (null != securityEl)
{
if (!String.IsNullOrWhiteSpace(securityEl.Value))
{
// See https://docs.microsoft.com/en-us/previous-versions/office/developer/office-2010/cc840043%28v%3doffice.14%29
return((Int16.Parse(securityEl.Value) & 4) == 4);
}
}
package.Close();
// PowerPoint doesn't use DocSecurity (*sigh*) so need another check
XElement appEl = xmlDoc.Root.Element(XName.Get("Application", xmlDoc.Root.GetDefaultNamespace().NamespaceName));
if (null != appEl)
{
if (!String.IsNullOrWhiteSpace(appEl.Value) &&
appEl.Value.IndexOf("PowerPoint", StringComparison.InvariantCultureIgnoreCase) >= 0)
{
PresentationDocument presentationDocument = PresentationDocument.Open(path: filename, isEditable: false);
if (null != presentationDocument &&
presentationDocument.PresentationPart.Presentation.ModificationVerifier != null)
{
return(true);
}
}
}
}
}
}
}
catch (Exception) { }
return(false);
}
}
/**
* Fetches the InputStream to read the contents, based
* of the specified core part, for which we are defined
* as a suitable relationship
*/
public Stream GetContents(PackagePart corePart)
{
PackageRelationshipCollection prc =
corePart.GetRelationshipsByType(_relation);
IEnumerator <PackageRelationship> it = prc.GetEnumerator();
if (it.MoveNext())
{
PackageRelationship rel = it.Current;
PackagePartName relName = PackagingUriHelper.CreatePartName(rel.TargetUri);
PackagePart part = corePart.Package.GetPart(relName);
return(part.GetInputStream());
}
log.Log(POILogger.WARN, "No part " + _defaultName + " found");
return(null);
}
// Token: 0x06003F32 RID: 16178 RVA: 0x00120F84 File Offset: 0x0011F184
private PackagePart GetWpfEntryPart()
{
PackagePart result = null;
PackageRelationshipCollection relationshipsByType = this._package.GetRelationshipsByType("http://schemas.microsoft.com/wpf/2005/10/xaml/entry");
PackageRelationship packageRelationship = null;
using (IEnumerator <PackageRelationship> enumerator = relationshipsByType.GetEnumerator())
{
if (enumerator.MoveNext())
{
PackageRelationship packageRelationship2 = enumerator.Current;
packageRelationship = packageRelationship2;
}
}
if (packageRelationship != null)
{
Uri targetUri = packageRelationship.TargetUri;
result = this._package.GetPart(targetUri);
}
return(result);
}