I am building a JavaScript library that is implemented in Ocaml and compiled to JavaScript using js_of_ocaml.
One of my Ocaml function returns a string with binary data. How can I expose that using js_of_ocaml as a ArrayBuffer?
How to produce a `ArrayBuffer` from `bytes` using `js_of_ocaml`
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When you compile to javascript, manipulating binary data in
strings is extremely bug prone!The underlying reason is questionable choice of
js_of_ocaml: Because javascript strings are encoded in UTF16 whereas OCaml ones are (implicitly) encoded in UTF8,js_of_ocamltries to navigate in between the 2. Therefore, when it encounters a "character" whose code is > 127,js_of_ocamlconverts it which is a disaster if it is, in fact, raw binary data!The solution is to manipulate
bigstrings instead ofstrings. Bigstrings are(char, Bigarray.int8_unsigned_elt, Bigarray.c_layout) Bigarray.Array1.tin raw OCaml but more and more libraries aliases them. Especially, they areTyped_array.​Bigstring.tinjs_of_ocaml(where you can see functions to convert from and toArrayBuffer)If your function does work by magic on string once compiled in javascript, there are translation function in between bigstrings and strings in several places. For example the bigstring library: http://c-cube.github.io/ocaml-bigstring/ but these functions are also available in
Lwt_bytesof lwtYou can see an other question on the same subject (including ways to manipulate OCaml string in javascript while not touching them at all using
gen_js_api) at https://discuss.ocaml.org/t/handling-binary-data-in-ocaml-and-javascript/1519