Filters/FilterKonqHistory.cs

   1 //
   2 // FilterKonqHistory.cs
   3 //
   4 // Copyright (C) 2005 Debajyoti Bera <dbera.web@gmail.com>
   5 //
   6
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining a
   9 // copy of this software and associated documentation files (the "Software"),
  10 // to deal in the Software without restriction, including without limitation
  11 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12 // and/or sell copies of the Software, and to permit persons to whom the
  13 // Software is furnished to do so, subject to the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be included in
  16 // all copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  24 // DEALINGS IN THE SOFTWARE.
  25 //
  26
  27
  28 using System;
  29 using System.Collections;
  30 using System.IO;
  31 using System.Text;
  32
  33 using Beagle.Daemon;
  34 using Beagle.Util;
  35
  36 using HtmlAgilityPack;
  37
  38 namespace Beagle.Filters {
  39
  40         public class FilterKonqHistory : Beagle.Filters.FilterHtml {
  41
  42                 // use a static buffer to prevent constant alloc and de-alloc
  43                 private static byte[] buf = null;
  44
  45                 public FilterKonqHistory ()
  46                 {
  47                         RegisterSupportedTypes ();
  48                 }
  49
  50                 override protected void DoOpen (FileInfo info)
  51                 {
  52                         if (buf == null)
  53                                 buf = new byte [1024];
  54
  55                         StreamReader reader = new StreamReader (Stream, Encoding.GetEncoding (28591));
  56
  57                         // read the charset hint from indexable
  58                         string charset = null;
  59                         foreach (Property property in IndexableProperties) {
  60                                 if (property.Key != (StringFu.UnindexedNamespace + "charset"))
  61                                         continue;
  62                                 charset = (string) property.Value;
  63                                 //Console.WriteLine ("charset hint accepted: " + charset);
  64                                 break;
  65                         }
  66
  67
  68                         // now create a memorystream where htmlfilter will begin his show
  69                         Stream.Seek (0, SeekOrigin.Begin);
  70                         // count past 8 lines ... Streams suck!
  71                         int c = 0; // stores the number of newlines read
  72                         int b = 0;
  73                         while (c < 8 && (b = Stream.ReadByte ()) != -1) {
  74                                 if (b == '\n')
  75                                         c ++;
  76                         }
  77                         // copy the rest of the file to a memory stream
  78                         MemoryStream mem_stream = new MemoryStream ();
  79                         while ((b = Stream.Read (buf, 0, 1024)) != 0)
  80                                 mem_stream.Write (buf, 0, b);
  81                         mem_stream.Seek (0, SeekOrigin.Begin);
  82                         reader.Close ();
  83
  84                         HtmlDocument doc = new HtmlDocument ();
  85                         doc.ReportNode += HandleNodeEvent;
  86                         doc.StreamMode = true;
  87                         // we already determined encoding
  88                         doc.OptionReadEncoding = false;
  89                         Encoding enc = Encoding.UTF8;
  90                         if (charset != null && charset != String.Empty)
  91                             enc = Encoding.GetEncoding (charset);
  92
  93                         try {
  94                                 if (enc == null)
  95                                         doc.Load (mem_stream);
  96                                 else
  97                                         doc.Load (mem_stream, enc);
  98                         } catch (NotSupportedException) {
  99                                 doc.Load (mem_stream, Encoding.ASCII);
 100                         } catch (Exception e) {
 101                                 Console.WriteLine (e.Message);
 102                                 Console.WriteLine (e.StackTrace);
 103                         }
 104
 105                         Finished ();
 106                 }
 107
 108                 override protected void RegisterSupportedTypes ()
 109                 {
 110                         AddSupportedFlavor (FilterFlavor.NewFromMimeType (KonqHistoryUtil.KonqCacheMimeType));
 111                 }
 112         }
 113
 114 }