public NativeMethods.DiskExtent[] GetDiskExtents()
{
int numExtents = 1;
int bufferSize = 8 + Marshal.SizeOf(typeof(NativeMethods.DiskExtent)) * numExtents;
byte[] buffer = new byte[bufferSize];
int bytesRet = 0;
if (!NativeMethods.DeviceIoControl(_handle, NativeMethods.EIOControlCode.VolumeGetDiskExtents, null, 0, buffer, bufferSize, ref bytesRet, IntPtr.Zero))
{
if (Marshal.GetLastWin32Error() != NativeMethods.ERROR_MORE_DATA)
{
throw Win32Wrapper.GetIOExceptionForLastError();
}
numExtents = Marshal.ReadInt32(buffer, 0);
bufferSize = 8 + Marshal.SizeOf(typeof(NativeMethods.DiskExtent)) * numExtents;
buffer = new byte[bufferSize];
if (!NativeMethods.DeviceIoControl(_handle, NativeMethods.EIOControlCode.VolumeGetDiskExtents, null, 0, buffer, bufferSize, ref bytesRet, IntPtr.Zero))
{
throw Win32Wrapper.GetIOExceptionForLastError();
}
}
return(Win32Wrapper.ByteArrayToStructureArray <NativeMethods.DiskExtent>(buffer, 8, 1));
}
public static SafeFileHandle OpenFileHandle(string path)
{
SafeFileHandle handle = NativeMethods.CreateFileW(path, FileAccess.Read, FileShare.Read, IntPtr.Zero, FileMode.Open, 0, IntPtr.Zero);
if (handle.IsInvalid)
{
throw Win32Wrapper.GetIOExceptionForLastError();
}
return(handle);
}
public static NativeMethods.NtfsVolumeData GetNtfsVolumeData(SafeFileHandle volumeHandle)
{
NativeMethods.NtfsVolumeData volumeData = new NativeMethods.NtfsVolumeData();
int bytesRet = Marshal.SizeOf(volumeData);
if (!NativeMethods.DeviceIoControl(volumeHandle, NativeMethods.EIOControlCode.FsctlGetNtfsVolumeData, null, 0, volumeData, bytesRet, ref bytesRet, IntPtr.Zero))
{
throw Win32Wrapper.GetIOExceptionForLastError();
}
return(volumeData);
}
public static NativeMethods.DiskGeometry GetDiskGeometry(SafeFileHandle handle)
{
NativeMethods.DiskGeometry diskGeometry = new NativeMethods.DiskGeometry();
int bytesRet = Marshal.SizeOf(diskGeometry);
if (!NativeMethods.DeviceIoControl(handle, NativeMethods.EIOControlCode.DiskGetDriveGeometry, null, 0, diskGeometry, bytesRet, ref bytesRet, IntPtr.Zero))
{
throw Win32Wrapper.GetIOExceptionForLastError();
}
return(diskGeometry);
}
public static long GetDiskCapacity(SafeFileHandle diskHandle)
{
byte[] sizeBytes = new byte[8];
int bytesRet = sizeBytes.Length;
if (!NativeMethods.DeviceIoControl(diskHandle, NativeMethods.EIOControlCode.DiskGetLengthInfo, null, 0, sizeBytes, bytesRet, ref bytesRet, IntPtr.Zero))
{
throw Win32Wrapper.GetIOExceptionForLastError();
}
return(BitConverter.ToInt64(sizeBytes, 0));
}
public override int Read(byte[] buffer, int offset, int count)
{
int totalBytesRead = 0;
long length = Length;
while (totalBytesRead < count)
{
long alignedStart = (_position / Alignment) * Alignment;
int alignmentOffset = (int)(_position - alignedStart);
long newPos;
if (!NativeMethods.SetFilePointerEx(_handle, alignedStart, out newPos, 0))
{
throw Win32Wrapper.GetIOExceptionForLastError();
}
int toRead = (int)Math.Min(length - alignedStart, BufferSize);
int numRead;
if (!NativeMethods.ReadFile(_handle, _buffer, toRead, out numRead, IntPtr.Zero))
{
throw Win32Wrapper.GetIOExceptionForLastError();
}
int usefulData = numRead - alignmentOffset;
if (usefulData <= 0)
{
return(totalBytesRead);
}
int toCopy = Math.Min(count - totalBytesRead, usefulData);
Marshal.Copy(_buffer + alignmentOffset, buffer, offset + totalBytesRead, toCopy);
totalBytesRead += toCopy;
_position += toCopy;
}
return(totalBytesRead);
}
public Volume(string path, long length)
{
_path = path.TrimEnd('\\');
_length = length;
if (!_path.StartsWith(@"\\"))
{
_path = @"\\.\" + _path;
}
_handle = NativeMethods.CreateFileW(_path, FileAccess.Read, FileShare.ReadWrite, IntPtr.Zero, FileMode.Open, 0, IntPtr.Zero);
if (_handle.IsInvalid)
{
throw Win32Wrapper.GetIOExceptionForLastError();
}
// Enable reading the full contents of the volume (not just the region bounded by the file system)
int bytesRet = 0;
if (!NativeMethods.DeviceIoControl(_handle, NativeMethods.EIOControlCode.FsctlAllowExtendedDasdIo, IntPtr.Zero, 0, IntPtr.Zero, 0, ref bytesRet, IntPtr.Zero))
{
throw Win32Wrapper.GetIOExceptionForLastError();
}
}