| // 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 Float32List asFloat32List([int offsetInBytes = 0, int length ]) |
| /// Creates a Float32List view of a region of this byte buffer. |
| /// ... |
| /// The start index and length must describe a valid 32-bit aligned range of the |
| /// buffer: |
| /// - offsetInBytes must not be negative, |
| /// - offsetInBytes must be divisible by four, |
| /// - length must not be negative, and |
| /// - offsetInBytes + length * 4 must not be greater than lengthInBytes. |
| /// @description Checks that creating Float32List view with negative offset, |
| /// with offset not divisible by four, with negative length, or with |
| /// 'offsetInBytes + length * 4' greater then buffer length causes throwing |
| /// error at runtime. |
| /// @author ngl@unipro.ru |
| |
| |
| import "dart:typed_data"; |
| import "../../../Utils/expect.dart"; |
| |
| void check(ByteBuffer buffer) { |
| int shift = (Float32List.bytesPerElement == 4) ? 2 : 0; |
| // creates Float32List view with negative offset |
| Expect.throws(() { |
| buffer.asFloat32List(-1); |
| }); |
| // creates Float32List view with offset not divisible by four |
| Expect.throws(() { |
| buffer.asFloat32List(1); |
| }); |
| // creates Float32List view with negative length |
| Expect.throws(() { |
| buffer.asFloat32List(0, -8); |
| }); |
| // creates Float32List view with 'offsetInBytes + length * 4' |
| // greater then buffer length |
| Expect.throws(() { |
| buffer.asFloat32List(4, buffer.lengthInBytes >> shift); |
| }); |
| } |
| |
| main() { |
| var list2 = new List.filled(8, 0); |
| var list4 = new Int32x4List(6); |
| |
| check((new Int8List.fromList(list2)).buffer); |
| check((new Int16List.fromList(list2)).buffer); |
| check((new Int32List.fromList(list2)).buffer); |
| if (!isJS) { |
| check((new Int64List.fromList(list2)).buffer); |
| } |
| check((new Int32x4List.fromList(list4)).buffer); |
| } |