private function deliver( \ZipArchive &$epub, $src, $dir = ''){
		if( !$dir ){
			$dir = $src;
		}
		if( is_dir($src) ){
			$root = rtrim($src, DIRECTORY_SEPARATOR);
			foreach( scandir($src) as $file ){
				if( !preg_match('/^\./', $file) ){
					// Skip dot files
					$path = $root.DIRECTORY_SEPARATOR.$file;
					$this->deliver($epub, $path, $dir);
				}
			}
		}elseif( file_exists($src) ){
			$relative_path = ltrim(str_replace($dir, '', $src), DIRECTORY_SEPARATOR);
			$epub->addFile($src, $relative_path);
		}else{
			throw new CompileException(sprintf('Cannot copy file %s.', $src));
		}
	}