ResourceLoaderLESSFunctions.php

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<?php
class ResourceLoaderLESSFunctions {
    public static function embeddable( $frame, $less ) {
        $base = pathinfo( $less->parser->sourceName, PATHINFO_DIRNAME );
        $url = $frame[2][0];
        $file = realpath( $base . '/' . $url );
        return $less->toBool( $file
            && strpos( $url, '//' ) === false
            && filesize( $file ) < CSSMin::EMBED_SIZE_LIMIT
            && CSSMin::getMimeType( $file ) !== false );
    }

    public static function embed( $frame, $less ) {
        $base = pathinfo( $less->parser->sourceName, PATHINFO_DIRNAME );
        $url = $frame[2][0];
        $file = realpath( $base . '/' . $url );

        $data = CSSMin::encodeImageAsDataURI( $file );
        $less->addParsedFile( $file );
        return 'url(' . $data . ')';
    }
}