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Add decode_opt, an option-returning variant of decode #16

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Jul 15, 2018
Merged

Add decode_opt, an option-returning variant of decode #16

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6 changes: 6 additions & 0 deletions src/b64.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,12 @@ let decode ?alphabet input =
done;
Bytes.unsafe_to_string output

let decode_opt ?alphabet input =
try
Some (decode ?alphabet input)
with
Not_found -> None

let encode ?(pad=true) ?alphabet input =
let length = String.length input in
let words = (length + 2) / 3 in (* rounded up *)
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3 changes: 3 additions & 0 deletions src/b64.mli
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Expand Up @@ -39,6 +39,9 @@ val uri_safe_alphabet : string
@raise Not_found if [s] is not a valid Base64 string. *)
val decode : ?alphabet:string -> string -> string

(** Same as [decode], but returns [None] instead of raising. *)
val decode_opt : ?alphabet:string -> string -> string option

(** [encode s] encodes the string [s] into base64. If [pad] is false,
no trailing padding is added.
[pad] defaults to [true], and [alphabet] to {!default_alphabet}. *)
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