[Thunar-workers] [DokuWiki] page changed: design:mime-system

[thunar-workers at xfce.org]

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Date        : 2005/03/06 23:52
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Old Revision: http://thunar.xfce.org/wiki/design:mime-system?rev=1108155096
New Revision: http://thunar.xfce.org/wiki/design:mime-system
Edit Summary: 
User        : benny

@@ -2,9 +2,8 @@
  
  The MIME System is a vital part of the file manager. But it is important
  that the MIME System can be used outside Thunar at a later time (e.g. in
  the Xfce panel), so care should be taken during the design.
- 
  
  ===== MIME-type detection =====
  
  The most important and most critical task of the MIME System is to
@@ -13,9 +12,9 @@
  entity used in Thunar.
  
  A basic standard-compliant implementation could like this:
  
- {{design:mime:20050208-mime_type_detection.png}}
+ {{design:mime:20050307-mime_type_detection.png}}
  
  This process describes the detection of the primary MIME-type. The
  other associated MIME-types will be determined by following the
  subclassing and aliasing rules.
@@ -27,8 +26,13 @@
  
  :!: A possible implementation of the [[implementation:mime-glob-match|Glob
  Match]] is available, which features nice optimizations already.
  
+ 
+ ==== Implementation Hints ====
+ A few hints for the implementation:
+ 
+   * Don't read the file contents when starting the MIME type detection unless there's actually a magic rule > 80 present in the database (by default the Shared MIME Database does not contain such a rule). That way, we can completely skip reading the contents for a lot of files, that will simply match one of the Glob rules.
  
  ===== Glob/Magic Rules =====
  Every glob rule has a source file (''$XDG_DATA_DIRS/mime/globs'') and
  every magic rule has a source file (''$XDG_DATA_DIRS/mime/magic''). So,



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