blob: a3f43c8bbf8156f7df8c881f1ca3d82944d911c8 [file] [log] [blame]
// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// @assertion Uint16List asUint16List([int offsetInBytes = 0, int length ])
/// Creates a Uint16List view of a region of this byte buffer.
/// The view is backed by the bytes of this byte buffer. Any changes made to the
/// Uint16List will also change the buffer, and vice versa.
/// @description Checks that method asUint16List creates a Uint16List view of
/// a region of this byte buffer, and any changes made to Uint16List will also
/// change the buffer, and vice versa.
/// @author
import "dart:typed_data";
import "../../../Utils/expect.dart";
void check(ByteBuffer buffer) {
int bufSizeInBytes = buffer.lengthInBytes;
var res = buffer.asUint16List(0);
Uint16List res1 = buffer.asUint16List(0);
int viewSizeInBytes = res.lengthInBytes;
int viewLength = res.length;
int shift = (Uint16List.bytesPerElement == 2) ? 1 : 0;
Expect.isTrue(res is Uint16List);
Expect.equals(bufSizeInBytes >> shift, viewLength);
if (viewSizeInBytes != 0) {
Expect.equals(res[0], res1[0]);
// set value to the first element of res1
res1[0] = 2;
// the first element of res is equal to set value
Expect.equals(2, res[0]);
// set value to the last element of res
res[viewLength - 1] = 4;
// the last element of res1 is equal to set value
Expect.equals(4, res1[viewLength - 1]);
Expect.notEquals(res, res1);
Expect.equals(res.buffer, res1.buffer);
main() {
var list0 = <int>[];
var list1 = new List.filled(5, 0);
var list2 = new List.filled(8, 0);
var list3 = new Int32x4List(1);
var list4 = new Int32x4List(5);
var list5 = new Int32x4List(0);
check((new Int8List.fromList(list0)).buffer);
check((new Int8List.fromList(list1)).buffer);
check((new Int8List.fromList(list2)).buffer);
check((new Int16List.fromList(list0)).buffer);
check((new Int16List.fromList(list1)).buffer);
check((new Int16List.fromList(list2)).buffer);
check((new Int32List.fromList(list0)).buffer);
check((new Int32List.fromList(list1)).buffer);
check((new Int32List.fromList(list2)).buffer);
if (!isJS) {
check((new Int64List.fromList(list0)).buffer);
check((new Int64List.fromList(list1)).buffer);
check((new Int64List.fromList(list2)).buffer);
check((new Int32x4List.fromList(list5)).buffer);
check((new Int32x4List.fromList(list3)).buffer);
check((new Int32x4List.fromList(list4)).buffer);