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TypedArray.prototype.subarray: fixed the step at which '[[ByteOffset]]' is read

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Fabrice Bellard 2025-08-25 14:01:43 +02:00
parent bb34e2797f
commit c942978927
1 changed files with 5 additions and 4 deletions
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9
quickjs.c
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@ -54109,16 +54109,17 @@ static JSValue js_typed_array_subarray(JSContext *ctx, JSValueConst this_val,
if (JS_ToInt32Clamp(ctx, &start, argv[0], 0, len, len)) if (JS_ToInt32Clamp(ctx, &start, argv[0], 0, len, len))
goto exception; goto exception;
shift = typed_array_size_log2(p->class_id);
ta = p->u.typed_array;
/* Read byteOffset (ta->offset) even if detached */
offset = ta->offset + (start << shift);
final = len; final = len;
if (!JS_IsUndefined(argv[1])) { if (!JS_IsUndefined(argv[1])) {
if (JS_ToInt32Clamp(ctx, &final, argv[1], 0, len, len)) if (JS_ToInt32Clamp(ctx, &final, argv[1], 0, len, len))
goto exception; goto exception;
} }
count = max_int(final - start, 0); count = max_int(final - start, 0);
shift = typed_array_size_log2(p->class_id);
ta = p->u.typed_array;
/* Read byteOffset (ta->offset) even if detached */
offset = ta->offset + (start << shift);
ta_buffer = js_typed_array_get_buffer(ctx, this_val, 0); ta_buffer = js_typed_array_get_buffer(ctx, this_val, 0);
if (JS_IsException(ta_buffer)) if (JS_IsException(ta_buffer))
goto exception; goto exception;