BMP.php

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<?php
class BmpHandler extends BitmapHandler {

        function mustRender( $file ) {
                return true;
        }

        function getThumbType( $text, $mime, $params = null ) {
                return array( 'png', 'image/png' );
        }

        function getImageSize( $image, $filename ) {
                $f = fopen( $filename, 'rb' );
                if( !$f ) {
                        return false;
                }
                $header = fread( $f, 54 );
                fclose($f);

                // Extract binary form of width and height from the header
                $w = substr( $header, 18, 4);
                $h = substr( $header, 22, 4);

                // Convert the unsigned long 32 bits (little endian):
                try {
                        $w = wfUnpack( 'V', $w, 4 );
                        $h = wfUnpack( 'V', $h, 4 );
                } catch ( MWException $e ) {
                        return false;
                }
                return array( $w[1], $h[1] );
        }
}