adding some error codes which I will need.

xpcom/io/nsIFile.idl

@@ -260,7 +260,8 @@ interface nsIFile : nsISupports
 #define NS_FILE_PROGID "component://netscape/file"
 #define NS_FILE_CLASSNAME "File Specification"
 
-#define NS_ERROR_FILE_UNRECOGNIZED_PATH     NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 1)
+
+#define NS_ERROR_FILE_UNRECOGNIZED_PATH         NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 1)
 #define NS_ERROR_FILE_UNRESOLVABLE_SYMLINK      NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 2)
 #define NS_ERROR_FILE_EXECUTION_FAILED       NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 3)
 #define NS_ERROR_FILE_UNKNOWN_TYPE        NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 4)
@@ -271,9 +272,15 @@ interface nsIFile : nsISupports
 #define NS_ERROR_FILE_INVALID_PATH        NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 9)
 #define NS_ERROR_FILE_DISK_FULL           NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 10)
 #define NS_ERROR_FILE_CORRUPTED           NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 11)
-
-//PR_NOT_DIRECTORY_ERROR
 #define NS_ERROR_FILE_NOT_DIRECTORY           NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 12)
-
+#define NS_ERROR_FILE_IS_DIRECTORY                 NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 13)
+#define NS_ERROR_FILE_IS_LOCKED               NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 14)
+#define NS_ERROR_FILE_TOO_BIG                      NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 15)
+#define NS_ERROR_FILE_NO_DEVICE_SPACE              NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 16)
+#define NS_ERROR_FILE_NAME_TOO_LONG               NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 17)
+#define NS_ERROR_FILE_NOT_FOUND               NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 18)
+#define NS_ERROR_FILE_READ_ONLY               NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 19)
+#define NS_ERROR_FILE_DIR_NOT_EMPTY       NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 20)
+#define NS_ERROR_FILE_ACCESS_DENIED       NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_FILES, 21)
 
 %}