/// <summary>Ceate a new slice buffer with the specified page size</summary>
/// <param name="pageSize">Initial page size</param>
public SliceBuffer(int pageSize)
{
if (pageSize < 0)
{
throw new ArgumentOutOfRangeException("pageSize", "Page size cannt be less than zero");
}
m_pageSize = pageSize == 0 ? DefaultPageSize : SliceHelpers.Align(pageSize);
}
public void Test_SliceHelpers_Align()
{
// Even though 0 is a multiple of 16, it is always rounded up to 16 to simplify buffer handling logic
Assert.That(SliceHelpers.Align(0), Is.EqualTo(16));
// 1..16 => 16
for (int i = 1; i <= 16; i++)
{
Assert.That(SliceHelpers.Align(i), Is.EqualTo(16), "Align({0}) => 16", i);
}
// 17..32 => 32
for (int i = 17; i <= 32; i++)
{
Assert.That(SliceHelpers.Align(i), Is.EqualTo(32), "Align({0}) => 32", i);
}
// 33..48 => 48
for (int i = 33; i <= 48; i++)
{
Assert.That(SliceHelpers.Align(i), Is.EqualTo(48), "Align({0}) => 48", i);
}
// 2^N-1
for (int i = 6; i < 30; i++)
{
Assert.That(SliceHelpers.Align((1 << i) - 1), Is.EqualTo(1 << i));
}
// largest non overflowing
Assert.That(() => SliceHelpers.Align(int.MaxValue - 15), Is.EqualTo((int.MaxValue - 15)));
// overflow
Assert.That(() => SliceHelpers.Align(int.MaxValue), Throws.InstanceOf <OverflowException>());
Assert.That(() => SliceHelpers.Align(int.MaxValue - 14), Throws.InstanceOf <OverflowException>());
// negative values
Assert.That(() => SliceHelpers.Align(-1), Throws.InstanceOf <ArgumentOutOfRangeException>());
Assert.That(() => SliceHelpers.Align(int.MinValue), Throws.InstanceOf <ArgumentOutOfRangeException>());
}