| /* |
| * 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 Uint32List asUint32List([int offsetInBytes = 0, int length ]) |
| * Creates a Uint32List view of a region of this byte buffer. |
| * ... |
| * The viewed region start at offsetInBytes, which must be 32-bit aligned, and |
| * contains length 32-bit integers. If length is omitted, the range extends as |
| * far towards the end of the buffer as possible - if lengthInBytes is not |
| * divisible by four, the last bytes can't be part of the view. |
| * @description Checks that the viewed region begins with offsetInBytes byte, |
| * which must be 32-bit aligned, and contains length 32-bit integers. If length |
| * is omitted, the range extends to the end of the buffer (if buffer length in |
| * bytes is divisible by four), otherwise, the last bytes can't be part of the |
| * view. |
| * @author ngl@unipro.ru |
| */ |
| |
| import "dart:typed_data"; |
| import "../../../Utils/expect.dart"; |
| |
| void check(ByteBuffer buffer) { |
| int bufSizeInBytes = buffer.lengthInBytes; |
| // Uint32List view of a byte buffer |
| Uint32List res = buffer.asUint32List(0); |
| int viewSizeInBytes = res.lengthInBytes; |
| int viewLength = res.length; |
| int shift = (Uint32List.bytesPerElement == 4) ? 2 : 0; |
| int offset1 = 4; |
| int length1 = ((viewSizeInBytes - offset1) >> shift) - 1; |
| int offset2 = 8; |
| |
| // Uint32List view of a byte buffer with offset1 and length1 |
| Uint32List res1 = buffer.asUint32List(offset1, length1); |
| int view1Length = res1.length; |
| |
| // Uint32List view of a byte buffer with offset2 |
| Uint32List res2 = buffer.asUint32List(offset2); |
| int view2Length = res2.length; |
| |
| Expect.isTrue(res1 is Uint32List); |
| Expect.isTrue(res2 is Uint32List); |
| Expect.equals(length1, view1Length); |
| Expect.equals((viewSizeInBytes - offset2) >> shift, view2Length); |
| |
| if (viewSizeInBytes != 0) { |
| // set value to the first element of res1 |
| res1[0] = 2; |
| Expect.equals(2, res[offset1 >> shift]); |
| //set value to the last element if res1 |
| res1[view1Length - 1] = 4; |
| Expect.equals(4, res[(offset1 >> shift) + view1Length - 1]); |
| |
| // set value to the first element of res2 |
| res2[0] = 3; |
| Expect.equals(3, res[offset2 >> shift]); |
| // set value to the last element of res2 |
| res2[view2Length - 1] = 5; |
| Expect.equals(5, res[viewLength - 1]); |
| |
| if (bufSizeInBytes != viewSizeInBytes) { |
| ByteData resb = buffer.asByteData(0); |
| int cv = 0; |
| // checks that last 'bufSizeInBytes - viewSizeInBytes' bytes contain 0 |
| for (int i = viewSizeInBytes; i < bufSizeInBytes; i++) { |
| int v = resb.getInt8(i); |
| cv |= v; |
| } |
| Expect.equals(0, cv); |
| } |
| } |
| } |
| |
| main() { |
| var list1 = new List.filled(12, 0); |
| var list2 = new List.filled(13, 0); |
| var list4 = new Int32x4List(6); |
| |
| check((new Int8List.fromList(list1)).buffer); |
| check((new Int8List.fromList(list2)).buffer); |
| |
| check((new Int16List.fromList(list1)).buffer); |
| check((new Int16List.fromList(list2)).buffer); |
| |
| check((new Int32List.fromList(list1)).buffer); |
| check((new Int32List.fromList(list2)).buffer); |
| |
| check((new Int32List.fromList(list1)).buffer); |
| check((new Int64List.fromList(list2)).buffer); |
| |
| check((new Int32x4List.fromList(list4)).buffer); |
| } |