public void MaskedMemCpy_EndToEnd_HasExpectedValueAfterMemMask()
{
// see: MaskedMemCpy_MaskedMemCopyTestsData_HasExpectedMask for the prerequisites:
// --> we got a size of 12 bytes for the test data, 16 byte block size thus 48 byte of mask block data.
MaskedMemCpy_MaskedMemCopyTestsData_HasExpectedMask(); // adding test here such that it can not get removed accidentally.
// we generate some test data (24 bytes, which will initially set all padding to zero), and hash it.
// then we mess up the padding bytes, we hash again which will give a different value. (assert#1)
// we assert (AssertMemberwiseEqual) that we actually did not change any members (padding is transparent when accessing the members)
// finally we apply the expected padding mask which should bring back everything to the original state
const int seed = 0x72;
var testData0 = new MemMaskTestData_Mask
{
Offset0 = true,
Offset4 = 0x19abcdef,
Offset8 = true
};
var testData1 = new MemMaskTestData_Mask
{
Offset0 = true,
Offset4 = 0x01abcdef,
Offset8 = true
};
var mask = Masks.GetMaskView <MemMaskTestData_Mask>();
using (var _ = new NativeArray <MemMaskTestData_Mask>(2, Allocator.Persistent))
{
var data = _;
data[0] = testData0;
data[1] = testData1;
var view = NativeViewUtility.GetReadView(data);
var h0 = HashUtility.GetDenseHash(view, seed);
MessUpPaddingBytes(view, mask);
var h1 = HashUtility.GetDenseHash(view, seed);
Assert.AreNotEqual(h0, h1);
AssertMemberwiseEqual(testData0, data[0]);
AssertMemberwiseEqual(testData1, data[1]);
MaskedMemCopy.ApplyMask(view, mask);
Assert.AreEqual(h0, HashUtility.GetDenseHash(view, seed));
}
}
void AssertMemberwiseEqual(MemMaskTestData_Mask expected, MemMaskTestData_Mask actual)
{
Assert.AreEqual(expected.Offset0, actual.Offset0);
Assert.AreEqual(expected.Offset4, actual.Offset4);
Assert.AreEqual(expected.Offset8, actual.Offset8);
}