Filters/FilterJpeg.cs

   1 //
   2 // FilterJpeg.cs
   3 //
   4 // Copyright (C) 2004 Novell, Inc.
   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 using System;
  28 using System.IO;
  29 using System.Text;
  30
  31 using Beagle.Util;
  32 using Beagle.Daemon;
  33
  34 using SemWeb;
  35
  36 namespace Beagle.Filters {
  37
  38         public class FilterJpeg : FilterImage {
  39
  40                 public FilterJpeg () : base ()
  41                 {
  42                         AddSupportedFlavor (FilterFlavor.NewFromMimeType ("image/jpeg"));
  43                 }
  44
  45                 // FIXME: This is not particularly efficient
  46                 protected override void PullImageProperties ()
  47                 {
  48                         JpegHeader header = new JpegHeader (Stream);
  49                         byte [] commentdata = header.GetJFIFComment();
  50                         if (commentdata != null && commentdata.Length != 0)
  51                         {
  52                                 string comment = System.Text.Encoding.Default.GetString( commentdata, 0, commentdata.Length );
  53                                 if (comment != null && comment != "") {
  54                                         AddProperty (Beagle.Property.New ("jfif:Comment", comment));
  55                                         AddProperty (Beagle.Property.NewUnstored ("fixme:comment", comment));
  56                                 }
  57                         }
  58
  59                         byte [] data = header.GetRawExif ();
  60                         if (data == null || data.Length == 0)
  61                                 return;
  62                         ExifData exif = new ExifData (data, (uint) data.Length);
  63                         if (exif == null)
  64                                 return;
  65
  66                         string str;
  67
  68                         str = exif.LookupFirstValue (ExifTag.UserComment);
  69                         if (str != null && str != "") {
  70                                 AddProperty (Beagle.Property.New ("exif:UserComment", str));
  71                                 AddProperty (Beagle.Property.NewUnstored ("fixme:comment", str));
  72                         }
  73
  74
  75                         str = exif.LookupFirstValue (ExifTag.ImageDescription);
  76                         if (str != null && str != "") {
  77                                 AddProperty (Beagle.Property.New ("exif:ImageDescription", str));
  78                                 AddProperty (Beagle.Property.NewUnstored ("fixme:comment", str));
  79                         }
  80
  81                         str = exif.LookupFirstValue (ExifTag.PixelXDimension);
  82                         if (str != null && str != "") {
  83                                 Width = Int32.Parse (str);
  84                                 AddProperty (Beagle.Property.NewUnsearched ("exif:PixelXDimension", str));
  85                         }
  86
  87                         str = exif.LookupFirstValue (ExifTag.PixelYDimension);
  88                         if (str != null && str != "") {
  89                                 Height = Int32.Parse (str);
  90                                 AddProperty (Beagle.Property.NewUnsearched ("exif:PixelYDimension", str));
  91                         }
  92
  93                         str = exif.LookupFirstValue (ExifTag.ISOSpeedRatings);
  94                         if (str != null && str != "")
  95                                 AddProperty (Beagle.Property.NewUnsearched ("exif:ISOSpeedRatings", str));
  96
  97                         str = exif.LookupFirstValue (ExifTag.ShutterSpeedValue);
  98                         if (str != null && str != "")
  99                                 AddProperty (Beagle.Property.NewUnsearched ("exif:ShutterSpeedValue", str));
 100
 101                         str = exif.LookupFirstValue (ExifTag.ExposureTime);
 102                         if (str != null && str != "")
 103                                 AddProperty (Beagle.Property.NewUnsearched ("exif:ExposureTime", str));
 104
 105                         str = exif.LookupFirstValue (ExifTag.FNumber);
 106                         if (str != null && str != "")
 107                                 AddProperty (Beagle.Property.NewUnsearched ("exif:FNumber", str));
 108
 109                         str = exif.LookupFirstValue (ExifTag.ApertureValue);
 110                         if (str != null && str != "")
 111                                 AddProperty (Beagle.Property.NewUnsearched ("exif:ApertureValue", str));
 112
 113                         str = exif.LookupFirstValue (ExifTag.FocalLength);
 114                         if (str != null && str != "")
 115                                 AddProperty (Beagle.Property.NewUnsearched ("exif:FocalLength", str));
 116
 117                         str = exif.LookupFirstValue (ExifTag.Flash);
 118                         if (str != null && str != "")
 119                                 AddProperty (Beagle.Property.NewUnsearched ("exif:Flash", str));
 120
 121                         str = exif.LookupFirstValue (ExifTag.Model);
 122                         if (str != null && str != "")
 123                                 AddProperty (Beagle.Property.NewKeyword ("exif:Model", str));
 124
 125                         str = exif.LookupFirstValue (ExifTag.Copyright);
 126                         if (str != null && str != "")
 127                                 AddProperty (Beagle.Property.New ("exif:Copyright", str));
 128
 129                         str = exif.LookupFirstValue (ExifTag.DateTime);
 130                         if (str != null && str != "") {
 131                                 try {
 132                                         DateTime dt = ExifUtil.DateTimeFromString (str);
 133                                         AddProperty (Beagle.Property.NewDate ("exif:DateTime", dt));
 134                                 } catch (ArgumentOutOfRangeException e) {
 135                                         Logger.Log.Debug("EXIF DateTime '{0}' is invalid.", str);
 136                                 }
 137                         }
 138
 139                         byte [] xmp_data = header.GetRawXmp ();
 140
 141                         if (xmp_data != null) {
 142                                 int i;
 143                                 for (i = 0; i < xmp_data.Length; i++)
 144                                         if (xmp_data [i] == 0) {
 145                                                 i++;
 146                                                 break;
 147                                         }
 148
 149                                 XmpFile xmp = new XmpFile (new MemoryStream (xmp_data, i, xmp_data.Length - i));
 150                                 AddXmpProperties (xmp);
 151                         }
 152
 153                         Finished (); // That's all folks...
 154                 }
 155         }
 156 }