wip debug

.jjconflict-side-0/src/b32.ml

@@ -0,0 +1,38 @@
+(* Crockford's variant of Base32
+   http://www.crockford.com/wrmg/base32.html
+   except that:
+     - 'U' is not excluded but also decodes to 'V'
+     - '-' is not allowed
+     - checksum is not allowed *)
+
+(* 'I' 'L' 'O' 'U' excluded
+   no '=' padding in encoded string *)
+type t = string
+
+let alphabet = Base32.make_alphabet "0123456789ABCDEFGHJKMNPQRSTVWXYZ"
+
+let encode s =
+  let s = Base32.encode_string ~alphabet s in
+  (* remove '=' padding *)
+  match String.index_opt s '=' with
+  | None -> s
+  | Some i -> String.sub s 0 i
+
+let decode s =
+  let s =
+    String.map
+      (fun c ->
+        match Char.uppercase_ascii c with
+        | 'O' -> '0'
+        | 'I' | 'L' -> '1'
+        | 'U' -> 'V'
+        | c -> c)
+      s
+  in
+  (* restore padding for base32 lib *)
+  let n = 8 - (String.length s mod 8) in
+  let pad = String.make n '=' in
+  let s = s ^ pad in
+  match Base32.decode ~alphabet ~off:0 ~len:(String.length s) s with
+  | Error (`Msg e) -> Error e
+  | Ok v -> Ok v