LibTest/typed_data/ByteBuffer/asByteData_A03_t01.dart

// 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  ByteData asByteData([int offsetInBytes = 0, int length ])
/// Creates a ByteData view of a region of this byte buffer.
/// ...
/// The start index and length must describe a valid range of the buffer:
///  - offsetInBytes must not be negative,
///  - length must not be negative, and
///  - offsetInBytes + length must not be greater than lengthInBytes.
/// @description Checks that creating ByteData view with negative offset,
/// negative length, or 'length + offset' 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) {
  // creates ByteData view with negative offset
  Expect.throws(() {
    buffer.asByteData(-1);
  });
  // creates ByteData view with negative length
  Expect.throws(() {
    buffer.asByteData(1, -8);
  });
  // creates ByteData view with length + offset greater then buffer length
  Expect.throws(() {
    buffer.asByteData(1, buffer.lengthInBytes);
  });
}

main() {
  var list2 = new List.filled(6, 0);
  var list4 = new Int32x4List(6);

  check((new Int8List.fromList(list2)).buffer);
  check((new Int16List.fromList(list2)).buffer);
  check((new Int32List.fromList(list2)).buffer);
  check((new Int64List.fromList(list2)).buffer);
  check((new Int32x4List.fromList(list4)).buffer);
}