add method mimetype()

SeedDMS_Core/Core/inc.FileUtils.php

@@ -80,8 +80,37 @@ class SeedDMS_Core_File {
 	} /* }}} */
 
 	/**
-	 * @param $size
-	 * @param array $sizes
+	 * Return the mimetype of a given file
+	 *
+	 * This method uses finfo to determine the mimetype
+	 * but will correct some mimetypes which are
+	 * not propperly determined or could be more specific, e.g. text/plain
+	 * when it is actually text/markdown. In thoses cases
+	 * the file extension will be taken into account.
+	 *
+	 * @param string $filename name of file on disc
+	 * @return string mimetype
+	 */
+	static function mimetype($filename) { /* {{{ */
+		$finfo = finfo_open(FILEINFO_MIME_TYPE);
+		$mimetype = finfo_file($finfo, $filename);
+
+		switch($mimetype) {
+		case 'application/octet-stream':
+		case 'text/plain':
+			$lastDotIndex = strrpos($filename, ".");
+			if($lastDotIndex === false) $fileType = ".";
+			else $fileType = substr($filename, $lastDotIndex);
+			if($fileType == '.md')
+				$mimetype = 'text/markdown';
+			break;
+		}
+		return $mimetype;
+	} /* }}} */
+
+	/**
+	 * @param integer $size
+	 * @param array $sizes list of units for 10^0, 10^3, 10^6, ..., 10^(n*3) bytes
 	 * @return string
 	 */
 	static function format_filesize($size, $sizes = array('Bytes', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB')) { /* {{{ */