mcs/class/WindowsBase/System.IO.Packaging/ZipPackagePart.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Copyright (c) 2007 Novell, Inc. (http://www.novell.com)
  21 //
  22 // Authors:
  23 //      Chris Toshok (toshok@ximian.com)
  24 //
  25
  26 using System;
  27 using System.IO;
  28 using zipsharp;
  29
  30 namespace System.IO.Packaging {
  31
  32         public sealed class ZipPackagePart : PackagePart
  33         {
  34                 new ZipPackage Package {
  35                         get { return (ZipPackage)base.Package; }
  36                 }
  37
  38                 internal ZipPackagePart (Package package, Uri partUri)
  39                         : base (package, partUri)
  40                 {
  41
  42                 }
  43
  44                 internal ZipPackagePart (Package package, Uri partUri, string contentType)
  45                         : base (package, partUri, contentType)
  46                 {
  47
  48                 }
  49
  50                 internal ZipPackagePart (Package package, Uri partUri, string contentType, CompressionOption compressionOption )
  51                         : base (package, partUri, contentType, compressionOption)
  52                 {
  53
  54                 }
  55
  56                 protected override Stream GetStreamCore (FileMode mode, FileAccess access)
  57                 {
  58                         ZipPartStream zps;
  59                         MemoryStream stream;
  60                         if (Package.PartStreams.TryGetValue (Uri, out stream)) {
  61                                 zps = new ZipPartStream (Package, stream, access);
  62                                 if (mode == FileMode.Create)
  63                                         stream.SetLength (0);
  64                                 return new ZipPartStream (Package, stream, access);
  65                         }
  66
  67                         stream = new MemoryStream ();
  68                         try
  69                         {
  70                                 using (UnzipArchive archive = new UnzipArchive (Package.PackageStream)) {
  71                                         foreach (string file in archive.GetFiles ()) {
  72                                                 if (file != Uri.ToString ().Substring (1))
  73                                                         continue;
  74
  75                                                 using (Stream archiveStream = archive.GetStream (file)) {
  76                                                         int read = 0;
  77                                                         byte[] buffer = new byte [Math.Min (archiveStream.Length, 2 * 1024)];
  78                                                         while ((read = archiveStream.Read (buffer, 0, buffer.Length)) != 0)
  79                                                                 stream.Write (buffer, 0, read);
  80                                                 }
  81                                         }
  82                                 }
  83                         }
  84                         catch
  85                         {
  86                                 // The zipfile is invalid, so just create the file
  87                                 // as if it didn't exist
  88                                 stream.SetLength (0);
  89                         }
  90
  91                         Package.PartStreams.Add (Uri, stream);
  92                         if (mode == FileMode.Create)
  93                                 stream.SetLength (0);
  94                         return new ZipPartStream (Package, stream, access);
  95                 }
  96         }
  97
  98 }