Manual:How to use DjVu with MediaWiki

Example

Example - Page 5

How that works ?

• Manual:$wgDjvuDump - Path of the djvudump executable.
• Manual:$wgDjvuOutputExtension - File extension for the DJVU post processor output.
• Manual:$wgDjvuPostProcessor - Path of the DJVU post processor.
• Manual:$wgDjvuRenderer - Path of the ddjvu DJVU renderer.
• Manual:$wgDjvuToXML - Path of the djvutoxml executable.
• Manual:$wgDjvuTxt - Path of the djvutxt executable.

How to install on GNU/Linux

• Install DjVuLibre :

  − Download the DjVuLibre package (which includes djvudump and ddjvu files). And, in the path :

  ./configure

  make

  make install

  − Or use aptitude or Synaptic in Debian derivatives

• install netpbm package (use aptitude or Synaptic in Debian derivatives)
• Finally, add (or modify) the code lines below in the LocalSettings.php file (not in the DefaultSettings.php):

  $wgFileExtensions[] = 'djvu';

  $wgDjvuDump = "djvudump";

  $wgDjvuRenderer = "ddjvu";

  $wgDjvuTxt = "djvutxt";

  $wgDjvuPostProcessor = "ppmtojpeg";

  $wgDjvuOutputExtension = 'jpg';

How to install on Win32

WARNING : These explanations are obsolete, nothing works.

1. Download the DjVuLibre software (which includes djvudump.exe and ddjvu.exe files).
2. Install in "C:\DjVuLibre" (for example).
3. Download the NetPbm complete package (which includes pnmtojpeg.exe, pnmtopng.exe, ... files).
4. Install in "C:\GnuWin32\NetPbm"
5. Add "C:\GnuWin32\NetPbm\bin" to the Windows PATH Environment Variable (and reboot the computer).
6. Finally, add (or modify) the code lines below in the LocalSettings.php file (not in the DefaultSettings.php):
   • $wgFileExtensions[] = 'djvu';
   • $wgDjvuDump = 'C:/DjVuLibre/djvudump.exe';
   • $wgDjvuRenderer = 'C:/DjVuLibre/ddjvu.exe';
   • $wgDjvuTxt = 'C:/DjVuLibre/djvutxt.exe';
   • $wgDjvuPostProcessor = 'pnmtojpeg.exe';
   • $wgDjvuOutputExtension = 'jpg';

NOTES:

• don't use long paths in the $wgDjvuPostProcessor variable: it returns an Error creating thumbnail when 'C:' or '../' are written in the path.
• PHP needs memory to create thumbnails: this means a high memory_limit (~ 128MB) in the php.ini.

Next to do

• How to install DjVuLibre, Qt and netpbm on a server.

Problems and solutions

• If you got «Error creating thumbnail: terminate called after throwing an instance of 'DJVU::GException' ppmtojpeg: EOF / read error reading magic number» when view file, increase the $wgMaxShellMemory.
• Thumbnails of DjVu-file with non-Latin name are absent in a namespace Page. If you use extension WebStore in your own wiki, then in file $IP/extensions/WebStore/404-handler.php replace next string:

  $rel = substr( $url, strlen( $thumbBase ) + 1 ); // plus one for slash

  by

  $rel = urldecode(substr( $url, strlen( $thumbBase ) + 1 )); // plus one for slash

Other page

• Extension:Proofread Page
• Extension:PdfHandler

See also

• Creating a DjVu file

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