public void ReadAsync(ulong alignedSourceAddress, IntPtr alignedDestinationAddress, uint aligned_read_length, IOCompletionCallback callback, IAsyncResult asyncResult)
{
long logicalAddress = (long)alignedSourceAddress;
long page = logicalAddress >> PageSizeBits;
int pageIndex = (int)(page % BufferSize);
Debug.Assert(page == pageIndex);
Overlapped ov = new Overlapped(0, 0, IntPtr.Zero, asyncResult);
NativeOverlapped *ov_native = ov.UnsafePack(callback, IntPtr.Zero);
ov_native->OffsetLow = unchecked ((int)(alignedSourceAddress & 0xFFFFFFFF));
ov_native->OffsetHigh = unchecked ((int)((alignedSourceAddress >> 32) & 0xFFFFFFFF));
if (values[pageIndex] == null)
{
callback(2, 0, ov_native);
}
else
{
long physicalAddress = GetPhysicalAddress(logicalAddress);
Utility.Copy((byte *)physicalAddress, (byte *)alignedDestinationAddress, (int)aligned_read_length);
callback(0, aligned_read_length, ov_native);
}
}
public void WriteAsync(IntPtr alignedSourceAddress, ulong alignedDestinationAddress, uint numBytesToWrite, IOCompletionCallback callback, IAsyncResult asyncResult)
{
long logicalAddress = (long)alignedDestinationAddress;
long page = logicalAddress >> PageSizeBits;
int pageIndex = (int)(page % BufferSize);
Debug.Assert(page == pageIndex);
if (values[pageIndex] == null)
{
// Allocate a new page
AllocatePage(pageIndex);
}
else
{
//Clear an old used page
Array.Clear(values[pageIndex], 0, values[pageIndex].Length);
}
long physicalAddress = GetPhysicalAddress(logicalAddress);
Utility.Copy((byte *)alignedSourceAddress, (byte *)physicalAddress, (int)numBytesToWrite);
Overlapped ov = new Overlapped(0, 0, IntPtr.Zero, asyncResult);
NativeOverlapped *ov_native = ov.UnsafePack(callback, IntPtr.Zero);
ov_native->OffsetLow = unchecked ((int)(alignedDestinationAddress & 0xFFFFFFFF));
ov_native->OffsetHigh = unchecked ((int)((alignedDestinationAddress >> 32) & 0xFFFFFFFF));
callback(0, numBytesToWrite, ov_native);
}
public static void Copy(Key *src, Key *dst)
{
Utility.Copy((byte *)src, (byte *)dst, kSizeInBytes);
}