public static void Read(uint volume, Int64 address, uint length, byte[] data)
{
// try to open the current physical drive
SafeFileHandle hndl = DeviceApi.CreateFile(string.Format("\\\\.\\PhysicalDrive{0}", volume),
DeviceApi.GENERIC_READ,
DeviceApi.FILE_SHARE_READ | DeviceApi.FILE_SHARE_WRITE,
IntPtr.Zero,
DeviceApi.OPEN_EXISTING,
DeviceApi.FILE_ATTRIBUTE_READONLY,
IntPtr.Zero);
if (!hndl.IsInvalid)
{
// set the file pointer to the requested address
if (DeviceApi.SetFilePointerEx(hndl, address, out _, DeviceApi.EMoveMethod.Begin))
{
// read the requested data from the physical drive
uint dummy;
if (!DeviceApi.ReadFile(hndl, data, length, out dummy, IntPtr.Zero))
{
throw new System.IO.IOException("\"ReadFile\" API call failed");
}
}
else
{
throw new System.IO.IOException("\"SetFilePointerEx\" API call failed");
}
hndl.Close();
}
}
public long Position()
{
if (DeviceApi.SetFilePointerEx(safeFileHandle, 0, out var offset, DeviceApi.EMoveMethod.Current))
{
return(offset);
}
var error = Marshal.GetLastWin32Error();
throw new IOException($"Failed to get position, SetFilePointerEx returned Win32 error {error}");
}
public long Seek(long offset, SeekOrigin origin)
{
if (!Enum.TryParse <DeviceApi.EMoveMethod>(origin.ToString(), out var moveMethod))
{
throw new ArgumentOutOfRangeException(nameof(origin));
}
if (DeviceApi.SetFilePointerEx(safeFileHandle, offset, out var newOffset, moveMethod))
{
return(newOffset);
}
var error = Marshal.GetLastWin32Error();
throw new IOException($"Failed to seek position offset {offset} and origin {origin}, SetFilePointerEx returned Win32 error {error}");
}
