anil.recoil.org
Punycode (RFC3492) in OCaml
Update fuzz tests and sync changes
+26
-38
fuzz/fuzz_punycode.ml
+26
-38
fuzz/fuzz_punycode.ml
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(* Test that encode_utf8 never crashes on arbitrary input *)
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let test_encode_no_crash input =
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let _ = Punycode.encode_utf8 input in
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()
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ignore (Punycode.encode_utf8 input);
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check true
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(* Test that decode_utf8 never crashes on arbitrary input *)
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let test_decode_no_crash input =
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let _ = Punycode.decode_utf8 input in
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()
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ignore (Punycode.decode_utf8 input);
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check true
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(* Test roundtrip: encode then decode should give back original *)
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(* Test roundtrip: encode then decode should give back original (case-insensitive)
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IDNA/Punycode lowercases ASCII characters during encoding per RFC 5891 *)
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let test_roundtrip input =
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match Punycode.encode_utf8 input with
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| Ok encoded -> (
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match Punycode.decode_utf8 encoded with
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| Ok decoded -> check_eq ~pp:Format.pp_print_string input decoded
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| Ok decoded ->
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(* Compare lowercase versions since IDNA lowercases ASCII *)
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check_eq ~pp:Format.pp_print_string
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(String.lowercase_ascii input)
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(String.lowercase_ascii decoded)
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| Error _ ->
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(* Some encoded values might not decode, that's ok for fuzz testing *)
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())
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check true)
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| Error _ ->
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(* Some inputs might not encode, that's ok *)
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()
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(* Test that error printing never crashes *)
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let () =
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let pos = { Punycode.byte_offset = 0; char_index = 0 } in
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let errors =
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[
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Punycode.Overflow pos;
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Punycode.Invalid_character (pos, Uchar.of_int 0x1F600);
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Punycode.Invalid_digit (pos, 'x');
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Punycode.Unexpected_end pos;
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Punycode.Invalid_utf8 pos;
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Punycode.Label_too_long 100;
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Punycode.Empty_label;
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]
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in
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List.iter
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(fun e ->
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let _ = Format.asprintf "%a" Punycode.pp_error e in
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let _ = Punycode.error_to_string e in
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())
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errors
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check true
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(* Test ASCII-only strings (should pass through mostly unchanged) *)
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let test_ascii_string input =
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let ascii_only =
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String.init
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(String.length input mod 64)
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(fun i -> Char.chr (Char.code input.[i mod String.length input] mod 128))
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in
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if String.length ascii_only > 0 then
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match Punycode.encode ascii_only with Ok _ -> () | Error _ -> ()
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if String.length input > 0 then begin
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let ascii_only =
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String.init
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(String.length input mod 64)
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(fun i ->
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Char.chr (Char.code input.[i mod String.length input] mod 128))
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in
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if String.length ascii_only > 0 then
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ignore (Punycode.encode_utf8 ascii_only)
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end;
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check true
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(* Test inputs starting with ACE prefix "xn--" *)
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let test_ace_prefix input =
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let ace_input = "xn--" ^ input in
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let _ = Punycode.decode_utf8 ace_input in
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()
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ignore (Punycode.decode_utf8 ace_input);
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check true
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let () =
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add_test ~name:"punycode: encode no crash" [ bytes ] test_encode_no_crash;