void LoadParts() { parts = new Dictionary <Uri, ZipPackagePart> (new UriComparer()); try { using (UnzipArchive archive = new UnzipArchive(PackageStream)) { // Load the content type map file XmlDocument doc = new XmlDocument(); using (Stream s = archive.GetStream(ContentUri)) doc.Load(s); XmlNamespaceManager manager = new XmlNamespaceManager(doc.NameTable); manager.AddNamespace("content", ContentNamespace); // The file names in the zip archive are not prepended with '/' foreach (string file in archive.GetFiles()) { if (file.Equals(ContentUri, StringComparison.Ordinal)) { continue; } XmlNode node; CompressionOption compression = archive.GetCompressionLevel(file); if (file == RelationshipUri.ToString().Substring(1)) { CreatePartCore(RelationshipUri, RelationshipContentType, compression); continue; } string xPath = string.Format("/content:Types/content:Override[@PartName='/{0}']", file); node = doc.SelectSingleNode(xPath, manager); if (node == null) { string ext = Path.GetExtension(file); if (ext.StartsWith(".")) { ext = ext.Substring(1); } xPath = string.Format("/content:Types/content:Default[@Extension='{0}']", ext); node = doc.SelectSingleNode(xPath, manager); } // What do i do if the node is null? This means some has tampered with the // package file manually if (node != null) { CreatePartCore(new Uri("/" + file, UriKind.Relative), node.Attributes["ContentType"].Value, compression); } } } } catch { // The archive is invalid - therefore no parts } }
protected override Stream GetStreamCore(FileMode mode, FileAccess access) { ZipPartStream zps; MemoryStream stream; if (Package.PartStreams.TryGetValue(Uri, out stream)) { zps = new ZipPartStream(Package, stream, access); if (mode == FileMode.Create) { stream.SetLength(0); } return(new ZipPartStream(Package, stream, access)); } stream = new MemoryStream(); try { using (UnzipArchive archive = new UnzipArchive(Package.PackageStream)) { foreach (string file in archive.GetFiles()) { if (file != Uri.ToString().Substring(1)) { continue; } using (Stream archiveStream = archive.GetStream(file)) { int read = 0; byte[] buffer = new byte [Math.Min(archiveStream.Length, 2 * 1024)]; while ((read = archiveStream.Read(buffer, 0, buffer.Length)) != 0) { stream.Write(buffer, 0, read); } } } } } catch { // The zipfile is invalid, so just create the file // as if it didn't exist stream.SetLength(0); } Package.PartStreams.Add(Uri, stream); if (mode == FileMode.Create) { stream.SetLength(0); } return(new ZipPartStream(Package, stream, access)); }