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// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// Copyright (c) 2007 Novell, Inc. (http://www.novell.com)
//
// Authors:
// Chris Toshok (toshok@ximian.com)
//
using System;
using System.IO;
using zipsharp;
namespace System.IO.Packaging {
public sealed class ZipPackagePart : PackagePart
{
new ZipPackage Package {
get { return (ZipPackage)base.Package; }
}
internal ZipPackagePart (Package package, Uri partUri)
: base (package, partUri)
{
}
internal ZipPackagePart (Package package, Uri partUri, string contentType)
: base (package, partUri, contentType)
{
}
internal ZipPackagePart (Package package, Uri partUri, string contentType, CompressionOption compressionOption )
: base (package, partUri, contentType, compressionOption)
{
}
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);
}
}
}
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