includes/media/BMP.php

   1 <?php
   2 /**
   3  * Handler for Microsoft's bitmap format
   4  *
   5  * @file
   6  * @ingroup Media
   7  */
   8
   9 /**
  10  * Handler for Microsoft's bitmap format; getimagesize() doesn't
  11  * support these files
  12  *
  13  * @ingroup Media
  14  */
  15 class BmpHandler extends BitmapHandler {
  16
  17         /**
  18          * @param $file
  19          * @return bool
  20          */
  21         function mustRender( $file ) {
  22                 return true;
  23         }
  24
  25         /**
  26          * Render files as PNG
  27          *
  28          * @param $text
  29          * @param $mime
  30          * @param $params
  31          * @return array
  32          */
  33         function getThumbType( $text, $mime, $params = null ) {
  34                 return array( 'png', 'image/png' );
  35         }
  36
  37         /**
  38          * Get width and height from the bmp header.
  39          *
  40          * @param $image
  41          * @param $filename
  42          * @return array
  43          */
  44         function getImageSize( $image, $filename ) {
  45                 $f = fopen( $filename, 'rb' );
  46                 if( !$f ) {
  47                         return false;
  48                 }
  49                 $header = fread( $f, 54 );
  50                 fclose($f);
  51
  52                 // Extract binary form of width and height from the header
  53                 $w = substr( $header, 18, 4);
  54                 $h = substr( $header, 22, 4);
  55
  56                 // Convert the unsigned long 32 bits (little endian):
  57                 try {
  58                         $w = wfUnpack( 'V', $w, 4 );
  59                         $h = wfUnpack( 'V', $h, 4 );
  60                 } catch ( MWException $e ) {
  61                         return false;
  62                 }
  63                 return array( $w[1], $h[1] );
  64         }
  65 }