public void TestReadFromSinglePage_FullCopy()
{
var obj = new Dummy {
Number1 = 123, Number2 = 456
};
var dummySize = Marshal.SizeOf(typeof(Dummy));
Dummy *objPtr = &obj;
var data = new byte *[1];
data[0] = (byte *)objPtr;
using (var stream = new UnmanagedVectorMemoryStream(data, 0, dummySize))
{
var readData = new byte[dummySize];
stream.Read(readData, 0, dummySize);
fixed(byte *readDataPtr = readData)
Assert.Equal(0, NativeMethods.memcmp(data[0], readDataPtr, dummySize));
}
}
public void TestReadFromMultiplePages()
{
var obj1 = new Dummy {
Number1 = 123, Number2 = 456
};
var obj2 = new Dummy {
Number1 = 789, Number2 = 123
};
var obj3 = new Dummy {
Number1 = 901, Number2 = 234
};
var dummySize = Marshal.SizeOf(typeof(Dummy));
Dummy *ptrObj1 = &obj1;
Dummy *ptrObj2 = &obj2;
Dummy *ptrObj3 = &obj3;
{
var data = new byte *[3];
data[0] = (byte *)ptrObj1;
data[1] = (byte *)ptrObj2;
data[2] = (byte *)ptrObj3;
var dataBufferPtr = IntPtr.Zero;
try
{
dataBufferPtr = Marshal.AllocHGlobal(dummySize * 3 + 1);
var dataBuffer = (byte *)dataBufferPtr.ToPointer();
NativeMethods.memcpy(dataBuffer, data[0], dummySize);
NativeMethods.memcpy(dataBuffer + dummySize, data[1], dummySize);
NativeMethods.memcpy(dataBuffer + (dummySize * 2), data[2], dummySize);
using (var stream = new UnmanagedVectorMemoryStream(data, 0, dummySize))
{
var readData = new byte[dummySize * 3];
stream.Read(readData, 0, dummySize * 3);
fixed(byte *readDataPtr = readData)
{
// Assert.Equal(0, NativeMethods.memcmp(dataBuffer, readDataPtr, dummySize * 3));
var fetchedObj1Ptr = (Dummy *)readDataPtr;
Assert.Equal(obj1.Number1, fetchedObj1Ptr->Number1);
Assert.Equal(obj1.Number2, fetchedObj1Ptr->Number2);
var fetchedObj2Ptr = (Dummy *)(readDataPtr + dummySize);
Assert.Equal(obj2.Number1, fetchedObj2Ptr->Number1);
Assert.Equal(obj2.Number2, fetchedObj2Ptr->Number2);
var fetchedObj3Ptr = (Dummy *)(readDataPtr + (dummySize * 2));
Assert.Equal(obj3.Number1, fetchedObj3Ptr->Number1);
Assert.Equal(obj3.Number2, fetchedObj3Ptr->Number2);
}
}
}
finally
{
Marshal.FreeHGlobal(dataBufferPtr);
}
}
}
