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));
}
