includes/media/BMP.php

   1 <?php
   2 /**
   3  * Handler for Microsoft's bitmap format.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Media
  22  */
  23
  24 /**
  25  * Handler for Microsoft's bitmap format; getimagesize() doesn't
  26  * support these files
  27  *
  28  * @ingroup Media
  29  */
  30 class BmpHandler extends BitmapHandler {
  31         /**
  32          * @param File $file
  33          * @return bool
  34          */
  35         function mustRender( $file ) {
  36                 return true;
  37         }
  38
  39         /**
  40          * Render files as PNG
  41          *
  42          * @param string $text
  43          * @param string $mime
  44          * @param array $params
  45          * @return array
  46          */
  47         function getThumbType( $text, $mime, $params = null ) {
  48                 return array( 'png', 'image/png' );
  49         }
  50
  51         /**
  52          * Get width and height from the bmp header.
  53          *
  54          * @param File $image
  55          * @param string $filename
  56          * @return array
  57          */
  58         function getImageSize( $image, $filename ) {
  59                 $f = fopen( $filename, 'rb' );
  60                 if ( !$f ) {
  61                         return false;
  62                 }
  63                 $header = fread( $f, 54 );
  64                 fclose( $f );
  65
  66                 // Extract binary form of width and height from the header
  67                 $w = substr( $header, 18, 4 );
  68                 $h = substr( $header, 22, 4 );
  69
  70                 // Convert the unsigned long 32 bits (little endian):
  71                 try {
  72                         $w = wfUnpack( 'V', $w, 4 );
  73                         $h = wfUnpack( 'V', $h, 4 );
  74                 } catch ( Exception $e ) {
  75                         return false;
  76                 }
  77
  78                 return array( $w[1], $h[1] );
  79         }
  80 }