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|
(* Js_of_ocaml
* http://www.ocsigen.org/js_of_ocaml/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, with linking exception;
* either version 2.1 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*)
open Js_of_ocaml
open Typed_array
open! Bigarray
type ('a, 'b) ba = ('a, 'b, c_layout) Genarray.t
type ('a, 'b, 'c) ta = ('a, 'b, 'c) typedArray
module Setup = struct
type (_, _, _) t =
| Int8 : (int, int, Bigarray.int8_signed_elt) t
| Uint8 : (int, int, Bigarray.int8_unsigned_elt) t
| Int16 : (int, int, Bigarray.int16_signed_elt) t
| Uint16 : (int, int, Bigarray.int16_unsigned_elt) t
| Int32 : (Js.number_t, Int32.t, Bigarray.int32_elt) t
| Float32 : (Js.number_t, float, Bigarray.float32_elt) t
| Float64 : (Js.number_t, float, Bigarray.float64_elt) t
end
let kind_of_setup : type a b c. (a, b, c) Setup.t -> (b, c) kind = function
| Setup.Int8 -> Int8_signed
| Setup.Uint8 -> Int8_unsigned
| Setup.Int16 -> Int16_signed
| Setup.Uint16 -> Int16_unsigned
| Setup.Int32 -> Int32
| Setup.Float32 -> Float32
| Setup.Float64 -> Float64
let convert : type a b c. (a, b, c) Setup.t -> a -> b = function
| Setup.Int8 -> Fun.id
| Setup.Uint8 -> Fun.id
| Setup.Int16 -> Fun.id
| Setup.Uint16 -> Fun.id
| Setup.Int32 -> fun f -> Int32.of_float (Js.to_float f)
| Setup.Float32 -> Js.to_float
| Setup.Float64 -> Js.to_float
let type_of_setup : type a b c. (a, b, c) Setup.t -> (a, b, c) Typed_array.kind = function
| Setup.Int8 -> Int8_signed
| Setup.Uint8 -> Int8_unsigned
| Setup.Int16 -> Int16_signed
| Setup.Uint16 -> Int16_unsigned
| Setup.Int32 -> Int32_signed
| Setup.Float32 -> Float32
| Setup.Float64 -> Float64
let ta_type_is_correct : type a b c. (a, b, c) Setup.t -> (a, b, c) ta Js.t -> bool =
fun setup a ->
let get_prop prop obj = Js.Unsafe.get obj (Js.string prop) in
let name = a |> get_prop "constructor" |> get_prop "name" |> Js.to_string in
match setup, name with
| Setup.Float32, "Float32Array" -> true
| Setup.Float64, "Float64Array" -> true
| Setup.Int8, "Int8Array" -> true
| Setup.Uint8, "Uint8Array" -> true
| Setup.Int16, "Int16Array" -> true
| Setup.Uint16, "Uint16Array" -> true
| Setup.Int32, "Int32Array" -> true
| _, _ -> false
let kind_field_is_correct : type a b c. (a, b, c) Setup.t -> (b, c) ba -> bool =
fun setup a ->
(* To trigger a `false`, modify the `kind` integer hard coded in the
* `caml_ba_kind_of_typed_array` stub
*)
match kind_of_setup setup, Genarray.kind a with
| Float32, Float32 -> true
| Float64, Float64 -> true
| Int8_signed, Int8_signed -> true
| Int8_unsigned, Int8_unsigned -> true
| Int16_signed, Int16_signed -> true
| Int16_unsigned, Int16_unsigned -> true
| Int32, Int32 -> true
| _, _ -> false
let ba_of_array : type a b c. (a, b, c) Setup.t -> b array -> (b, c) ba =
fun setup a -> Array1.of_array (kind_of_setup setup) c_layout a |> genarray_of_array1
let array_of_ba : type a b. (a, b) ba -> a array =
fun a ->
let a = Bigarray.array1_of_genarray a in
let len = Bigarray.Array1.dim a in
let rec aux i =
if i == len then [] else Bigarray.Array1.unsafe_get a i :: aux (i + 1)
in
aux 0 |> Array.of_list
let array_of_ta : type a b c. (a, b, c) Setup.t -> (a, b, c) ta Js.t -> b array =
fun setup a ->
let len = a##.length in
let rec aux i =
if i == len then [] else convert setup (unsafe_get a i) :: aux (i + 1)
in
aux 0 |> Array.of_list
let test : type a b c. (a, b, c) Setup.t -> b array -> unit =
fun setup a0 ->
let a1 = ba_of_array setup a0 in
let a2 = from_genarray (type_of_setup setup) a1 in
if not (array_of_ta setup a2 = a0) then print_endline "`a2` doesnt match `a0`";
if not (ta_type_is_correct setup a2) then print_endline "corrupted typedArray type";
let a3 = to_genarray a2 in
if not (array_of_ba a3 = a0) then print_endline "`a3` doesnt match `a0`";
if not (kind_field_is_correct setup a3) then print_endline "corrupted `kind`";
()
(* Byte-wise equality *)
let typed_arrays_equal ta1 ta2 =
let byte_len1 = ta1##.byteLength and byte_len2 = ta2##.byteLength in
if not (Int.equal byte_len1 byte_len2)
then false
else
let view1 = new%js dataView ta1##.buffer in
let view2 = new%js dataView ta2##.buffer in
let rec cmp i =
if i >= byte_len1
then true
else Int.equal (view1##getUint8 i) (view2##getUint8 i) && cmp (i + 1)
in
cmp 0
let%expect_test "float32" =
test Setup.Float32 [| Float.neg_infinity; -1.; 0.; 1.; Float.infinity |];
[%expect {||}]
let%expect_test "float64" =
test Setup.Float64 [| Float.neg_infinity; -1.; 0.; 1.; Float.infinity |];
[%expect {||}]
let%expect_test "int8" =
test Setup.Int8 [| -128; -1; 0; 1; 127 |];
[%expect {||}]
let%expect_test "uint8" =
let a = [| 0; 255 |] in
test Setup.Uint8 a;
let ta = from_genarray (type_of_setup Setup.Uint8) (ba_of_array Setup.Uint8 a) in
let bytes = Typed_array.Bytes.of_uint8Array ta in
let ta' = Typed_array.Bytes.to_uint8Array bytes in
if not (typed_arrays_equal ta ta')
then print_endline "round-trip from uint8Array to bytes and back not equal";
let buffer = ta##.buffer in
let bytes'' = Typed_array.Bytes.of_arrayBuffer buffer in
if not (Stdlib.Bytes.equal bytes'' bytes)
then print_endline "bytes from arrayBuffer not equal to bytes from of_uint8Array";
[%expect {||}]
let%expect_test "int16" =
test Setup.Int16 [| -32768; -1; 0; 1; 32767 |];
[%expect {||}]
let%expect_test "uint16" =
test Setup.Uint16 [| 0; 65535 |];
[%expect {||}]
let%expect_test "int32" =
test Setup.Int32 [| -2147483648l; -1l; 0l; 1l; 2147483647l |];
[%expect {||}]
|
