bludgeon/GzipFileObject.cs

   1
   2 using System;
   3 using System.Collections;
   4 using System.IO;
   5 using System.Text;
   6
   7 using ICSharpCode.SharpZipLib;
   8 using ICSharpCode.SharpZipLib.GZip;
   9
  10 using Beagle.Util;
  11 using Beagle;
  12
  13 namespace Bludgeon {
  14
  15         public class GzipFileObject : FileObject {
  16
  17                 public GzipFileObject (FileObject gzipped_file)
  18                 {
  19                         AllowChildren ();
  20                         AddChild (gzipped_file, null);
  21                 }
  22
  23                 override protected string GetChildUri (FileSystemObject children)
  24                 {
  25                         // FIXME: What is the uri scheme for gzip files?
  26                         return this.Uri + "#" + children.Name;
  27                 }
  28
  29                 override public string MimeType {
  30                         get { return "application/x-gzip"; }
  31                 }
  32
  33                 override public string Extension {
  34                         get { return ".gz"; }
  35                 }
  36
  37                 override public void AddToStream (Stream stream, EventTracker tracker)
  38                 {
  39                         if (ChildCount > 1)
  40                                 throw new Exception ("Gzip file " + Uri + " has " + ChildCount + " children");
  41
  42                         if (tracker != null)
  43                                 tracker.ExpectingAdded (this.Uri);
  44
  45                         UnclosableStream unclosable;
  46                         unclosable = new UnclosableStream (stream);
  47
  48                         GZipOutputStream gz_out;
  49                         gz_out = new GZipOutputStream (unclosable);
  50
  51                         MemoryStream memory;
  52                         memory = new MemoryStream ();
  53                         // There should just be one child
  54                         foreach (FileObject file in Children)
  55                                 file.AddToStream (memory, tracker);
  56                         gz_out.Write (memory.ToArray (), 0, (int) memory.Length);
  57                         memory.Close ();
  58
  59                         gz_out.Close ();
  60                 }
  61
  62                 override protected bool MatchesQueryPart (QueryPart part)
  63                 {
  64                         // The only thing that could match is the name, and we check
  65                         // for that already in FileSystemObject.MatchesQuery.
  66                         return false;
  67                 }
  68         }
  69 }