BMP.php

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<?php
class BmpHandler extends BitmapHandler {
    public function mustRender( $file ) {
        return true;
    }

    function getThumbType( $text, $mime, $params = null ) {
        return [ '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 ( Exception $e ) {
            return false;
        }

        return [ $w[1], $h[1] ];
    }
}