public void TestReadFromMultiplePages_OffsetFromBegin(int offset)
{
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));
var data = new byte *[3];
data[0] = (byte *)&obj1;
data[1] = (byte *)&obj2;
data[2] = (byte *)&obj3;
var dataBufferPtr = IntPtr.Zero;
try
{
dataBufferPtr = Marshal.AllocHGlobal((dummySize * 3) - offset);
var dataBuffer = (byte *)dataBufferPtr.ToPointer();
NativeMethods.memcpy(dataBuffer, data[0] + offset, dummySize - offset);
NativeMethods.memcpy(dataBuffer + dummySize - offset, data[1], dummySize);
NativeMethods.memcpy(dataBuffer + (dummySize * 2) - offset, data[2], dummySize);
using (var stream = new UnmanagedVectorMemoryStream(data, 0, dummySize))
{
var readData = new byte[(dummySize * 3) - offset];
stream.Seek(offset, SeekOrigin.Begin);
stream.Read(readData, 0, (dummySize * 3) - offset);
fixed(byte *readDataPtr = readData)
{
var fetchedObj2Ptr = (Dummy *)(readDataPtr + dummySize - offset);
var fetchedObj3Ptr = (Dummy *)(readDataPtr + ((dummySize * 2) - offset));
Assert.Equal(obj2.Number1, fetchedObj2Ptr->Number1);
Assert.Equal(obj2.Number2, fetchedObj2Ptr->Number2);
Assert.Equal(obj3.Number1, fetchedObj3Ptr->Number1);
Assert.Equal(obj3.Number2, fetchedObj3Ptr->Number2);
}
}
}
finally
{
Marshal.FreeHGlobal(dataBufferPtr);
}
}
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 Read_should_work_correctly()
{
var random = new Random();
var arr1 = new byte[25];
var arr2 = new byte[25];
var arr3 = new byte[25];
random.NextBytes(arr1);
random.NextBytes(arr2);
random.NextBytes(arr3);
fixed(byte *parr1 = arr1)
fixed(byte *parr2 = arr2)
fixed(byte *parr3 = arr3)
{
var array = new[] { parr1, parr2, parr3 };
var stream = new UnmanagedVectorMemoryStream(array, 1, 25);
var expectedReadOutut = new byte[50];
fixed(byte *pExpectedReadOutut = expectedReadOutut)
{
NativeMethods.memcpy(pExpectedReadOutut, parr2, 25);
NativeMethods.memcpy(pExpectedReadOutut + 25, parr3, 25);
}
var readOutput = new byte[50];
var debugReadOutput = stream.DebugReadAllData(25);
stream.Read(readOutput, 0, 50);
Assert.Equal(debugReadOutput, readOutput);
Assert.Equal(expectedReadOutut, debugReadOutput);
Assert.Equal(expectedReadOutut, readOutput);
}
}
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);
}
}
}
