package tiny_appkits

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Source file Saved.ml

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(* Claude Code
 *
 * Copyright (C) 2026 Yoann Padioleau
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public License
 * (LGPL) as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 *)

let to_string ~magic v = magic ^ "\n" ^ Marshal.to_string v []

let of_string ~magic s =
  let head = magic ^ "\n" in
  let n = String.length head in
  if String.length s < n + Marshal.header_size || String.sub s 0 n <> head then None
  else
    let b = Bytes.unsafe_of_string s in
    (* all of the data, as Marshal's own header counts it *)
    if Marshal.total_size b n > String.length s - n then None
    else try Some (Marshal.from_bytes b n) with _ -> None