public void OnUInt32(uint offset, int boundary, uint expected)
{
// Act
var actual = BinaryMath.GetPadding(offset, boundary);
// Assert
Assert.Equal(expected, actual);
}
public void OnInt64(long offset, int boundary, long expected)
{
// Act
var actual = BinaryMath.GetPadding(offset, boundary);
// Assert
Assert.Equal(expected, actual);
}
public void Int32_ShouldReturnExpectedResult(int offset, int boundary, int expected)
{
// Act
var actual = BinaryMath.GetPadding(offset, boundary);
// Assert
Assert.Equal(expected, actual);
}
/// <summary>
/// Aligns the specified offset to the next boundary.
/// </summary>
/// <param name="offset">The offset.</param>
/// <param name="boundary">The boundary.</param>
/// <returns>The new offset.</returns>
public static ulong Align(ulong offset, int boundary)
{
#region Contract
if (boundary <= 0)
{
throw new ArgumentOutOfRangeException(nameof(boundary));
}
#endregion
return(checked (offset + BinaryMath.GetPadding(offset, 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 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));
}
}
