public void UInt64_ShouldReturnExpectedResult(ulong input, bool expected)
{
// Act
bool actual = BinaryMath.IsPowerOfTwoOrZero(input);
// Assert
Assert.Equal(expected, actual);
}
/// <summary>
/// Calculates the padding needed to get the specified offset to a multiple of the specified boundary.
/// </summary>
/// <param name="offset">The offset.</param>
/// <param name="boundary">The boundary.</param>
/// <returns>The number of padding bytes to add.</returns>
public static long GetPadding(long offset, int boundary)
{
#region Contract
if (boundary <= 0)
{
throw new ArgumentOutOfRangeException(nameof(boundary));
}
#endregion
if (BinaryMath.IsPowerOfTwoOrZero(boundary))
{
return((long)BinaryMath.GetPadding(unchecked ((ulong)offset), boundary));
}
else
{
return(IntegerMath.Modulo(boundary - IntegerMath.Modulo(offset, boundary), boundary));
}
}
/// <summary>
/// Calculates the padding needed to get the specified offset to a multiple of the specified boundary.
/// </summary>
/// <param name="offset">The offset.</param>
/// <param name="boundary">The boundary.</param>
/// <returns>The number of padding bytes to add.</returns>
public static ulong GetPadding(ulong offset, int boundary)
{
#region Contract
if (boundary <= 0)
{
throw new ArgumentOutOfRangeException(nameof(boundary));
}
#endregion
ulong b = unchecked ((ulong)boundary);
if (BinaryMath.IsPowerOfTwoOrZero(boundary))
{
return((~offset + 1) & (b - 1));
}
else
{
return((b - (offset % b)) % b);
}
}
/// <summary>
/// Determines whether a value is a positive power of two.
/// </summary>
/// <param name="value">The value to test.</param>
/// <returns><see langword="true"/> when <paramref name="value"/> is a positive power of two;
/// otherwise, <see langword="false"/>.</returns>
public static bool IsPowerOfTwo(long value)
{
return(value > 0 && BinaryMath.IsPowerOfTwoOrZero(unchecked ((ulong)value)));
}
/// <summary>
/// Determines whether a value is a positive power of two, or zero.
/// </summary>
/// <param name="value">The value to test.</param>
/// <returns><see langword="true"/> when <paramref name="value"/> is a positive power of two,
/// or zero; otherwise, <see langword="false"/>.</returns>
public static bool IsPowerOfTwoOrZero(int value)
{
return(BinaryMath.IsPowerOfTwoOrZero((long)value));
}
/// <summary>
/// Determines whether a value is a power of two.
/// </summary>
/// <param name="value">The value to test.</param>
/// <returns><see langword="true"/> when <paramref name="value"/> is a power of two;
/// otherwise, <see langword="false"/>.</returns>
public static bool IsPowerOfTwo(ulong value)
{
return(value != 0 && BinaryMath.IsPowerOfTwoOrZero(value));
}
