LibTest/typed_data/ByteData/setUint64_A01_t01.dart

// Copyright (c) 2013, 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
 * void setUint64(
 *     int byteOffset,
 *     int value, [
 *     Endian endian = Endian.big
 * ])
 * Sets the eight bytes starting at the specified [byteOffset] in this object to
 * the unsigned binary representation of the specified [value], which must fit
 * in eight bytes.
 * In other words, [value] must be between 0 and pow(2, 64) - 1, inclusive.
 * @description Checks that the value at the [byteOffset] is set to [value].
 * @author msyabro
 */

import "dart:typed_data";
import "../../../Utils/expect.dart";

main() {
  var u64 = new Uint64List(16);
  var valuesToBeSet = [
    123, 95, 25, 98, 0, 113, 20, 9, 1, 9223372036854775807,
    1844674407370955161, 25, 69, 52, 125, 31
  ];
  var expectedBigEndian = [
    8863084066665136128, 6845471433603153920, 1801439850948198400,
    7061644215716937728, 0, 8142508126285856768, 1441151880758558720,
    648518346341351424, 72057594037927936, -129,
    -7378697629483820775, 1801439850948198400, 4971973988617027584,
    3746994889972252672, 9007199254740992000, 2233785415175766016
  ];
  int bytesInElement = Int64List.bytesPerElement;

  var byteDataFromU64 = new ByteData.view(u64.buffer);
  for (int i = 0; i < byteDataFromU64.lengthInBytes / bytesInElement; ++i) {
    byteDataFromU64.setUint64(
        i * bytesInElement, valuesToBeSet[i], Endian.little);
  }
  Expect.listEquals(valuesToBeSet, u64);

  for (int i = 0; i < byteDataFromU64.lengthInBytes / bytesInElement; ++i) {
    byteDataFromU64.setUint64(i * bytesInElement, valuesToBeSet[i]);
  }
  Expect.listEquals(expectedBigEndian, u64);
}