Fix setting the max-upload-size for really large values.

php can only parse filesize units up to gigabytes, not terabytes or petabytes.

lib/private/files.php

@@ -280,9 +280,7 @@ class OC_Files {
 				return false;
 			$size -= 1;
 		} else {
-			$size = OC_Helper::humanFileSize($size);
-			$size = substr($size, 0, -1); //strip the B
-			$size = str_replace(' ', '', $size); //remove the space between the size and the postfix
+			$size = OC_Helper::phpFileSize($size);
 		}
 
 		//don't allow user to break his config -- broken or malicious size input

lib/private/helper.php

@@ -305,6 +305,32 @@ class OC_Helper {
 		return "$bytes PB";
 	}
 
+	/**
+	 * @brief Make a php file size
+	 * @param int $bytes file size in bytes
+	 * @return string a php parseable file size
+	 *
+	 * Makes 2048 to 2k and 2^41 to 2048G
+	 */
+	public static function phpFileSize($bytes) {
+		if ($bytes < 0) {
+			return "?";
+		}
+		if ($bytes < 1024) {
+			return $bytes . "B";
+		}
+		$bytes = round($bytes / 1024, 1);
+		if ($bytes < 1024) {
+			return $bytes . "K";
+		}
+		$bytes = round($bytes / 1024, 1);
+		if ($bytes < 1024) {
+			return $bytes . "M";
+		}
+		$bytes = round($bytes / 1024, 1);
+		return $bytes . "G";
+	}
+
 	/**
 	 * @brief Make a computer file size
 	 * @param string $str file size in human readable format