ficher: use lib/encoder

docs/content/fichier.md

@@ -87,11 +87,31 @@ normal file system).
 Duplicated files cause problems with the syncing and you will see
 messages in the log about duplicates.
 
-### Forbidden characters ###
+#### Restricted filename characters
 
-1Fichier does not support the characters ``\ < > " ' ` $`` and spaces at the beginning of folder names.
-`rclone` automatically escapes these to a unicode equivalent. The exception is `/`, 
-which cannot be escaped and will therefore lead to errors.
+In addition to the [default restricted characters set](/overview/#restricted-characters)
+the following characters are also replaced:
+
+| Character | Value | Replacement |
+| --------- |:-----:|:-----------:|
+| \         | 0x5C  | ＼           |
+| <         | 0x3C  | ＜           |
+| >         | 0x3E  | ＞           |
+| "         | 0x22  | ＂           |
+| $         | 0x24  | ＄           |
+| `         | 0x60  | ｀           |
+| '         | 0x27  | ＇           |
+
+File names can also not start or end with the following characters.
+These only get replaced if they are first or last character in the
+name:
+
+| Character | Value | Replacement |
+| --------- |:-----:|:-----------:|
+| SP        | 0x20  | ␠           |
+
+Invalid UTF-8 bytes will also be [replaced](/overview/#invalid-utf8),
+as they can't be used in JSON strings.
 
 <!--- autogenerated options start - DO NOT EDIT, instead edit fs.RegInfo in backend/fichier/fichier.go then run make backenddocs -->
 ### Standard Options