internal FileIdBothDirectoryInfo(NativeMethods.FileIdBothDirInfo fibdi, string fileName)
{
CreationTime = DateTime.FromFileTimeUtc(fibdi.CreationTime).ToLocalTime();
LastAccessTime = DateTime.FromFileTimeUtc(fibdi.LastAccessTime).ToLocalTime();
LastWriteTime = DateTime.FromFileTimeUtc(fibdi.LastWriteTime).ToLocalTime();
ChangeTime = DateTime.FromFileTimeUtc(fibdi.ChangeTime).ToLocalTime();
AllocationSize = fibdi.AllocationSize;
EndOfFile = fibdi.EndOfFile;
ExtendedAttributesSize = fibdi.EaSize;
FileAttributes = fibdi.FileAttributes;
FileId = fibdi.FileId;
FileIndex = fibdi.FileIndex;
FileName = fileName;
// ShortNameLength is the number of bytes in the short name; since we have a unicode string we must divide that by 2.
ShortName = new string(fibdi.ShortName, 0, fibdi.ShortNameLength / 2);
}
internal static IEnumerable <FileIdBothDirectoryInfo> EnumerateFileIdBothDirectoryInfoInternal(KernelTransaction transaction, SafeFileHandle safeHandle, string path, FileShare shareMode, bool continueOnException, PathFormat pathFormat)
{
if (!NativeMethods.IsAtLeastWindowsVista)
{
throw new PlatformNotSupportedException(Resources.RequiresWindowsVistaOrHigher);
}
bool callerHandle = safeHandle != null;
if (!callerHandle)
{
if (Utils.IsNullOrWhiteSpace(path))
{
throw new ArgumentNullException("path");
}
string pathLp = Path.GetExtendedLengthPathInternal(transaction, path, pathFormat, GetFullPathOptions.RemoveTrailingDirectorySeparator | GetFullPathOptions.FullCheck);
safeHandle = File.CreateFileInternal(transaction, pathLp, ExtendedFileAttributes.BackupSemantics, null, FileMode.Open, FileSystemRights.ReadData, shareMode, true, PathFormat.LongFullPath);
}
try
{
if (!NativeMethods.IsValidHandle(safeHandle, Marshal.GetLastWin32Error(), !continueOnException))
{
yield break;
}
// 2014-10-16: Number of returned items depends on the size of the buffer.
// That does not seem right, investigate.
using (var safeBuffer = new SafeGlobalMemoryBufferHandle(NativeMethods.DefaultFileBufferSize))
{
NativeMethods.IsValidHandle(safeBuffer, Marshal.GetLastWin32Error());
long fileNameOffset = Marshal.OffsetOf(typeof(NativeMethods.FileIdBothDirInfo), "FileName").ToInt64();
while (NativeMethods.GetFileInformationByHandleEx(safeHandle, NativeMethods.FileInfoByHandleClass.FileIdBothDirectoryInfo, safeBuffer.DangerousGetHandle(), NativeMethods.DefaultFileBufferSize))
{
// CA2001:AvoidCallingProblematicMethods
IntPtr buffer = IntPtr.Zero;
bool successRef = false;
safeBuffer.DangerousAddRef(ref successRef);
// MSDN: The DangerousGetHandle method poses a security risk because it can return a handle that is not valid.
if (successRef)
{
buffer = safeBuffer.DangerousGetHandle();
}
safeBuffer.DangerousRelease();
if (buffer == IntPtr.Zero)
{
NativeError.ThrowException(Resources.HandleDangerousRef);
}
// CA2001:AvoidCallingProblematicMethods
while (buffer != IntPtr.Zero)
{
NativeMethods.FileIdBothDirInfo fibdi = Utils.MarshalPtrToStructure <NativeMethods.FileIdBothDirInfo>(0, buffer);
string fileName = Marshal.PtrToStringUni(new IntPtr(fileNameOffset + buffer.ToInt64()), (int)(fibdi.FileNameLength / 2));
if (!Utils.IsNullOrWhiteSpace(fileName) &&
!fileName.Equals(Path.CurrentDirectoryPrefix, StringComparison.OrdinalIgnoreCase) &&
!fileName.Equals(Path.ParentDirectoryPrefix, StringComparison.OrdinalIgnoreCase))
{
yield return(new FileIdBothDirectoryInfo(fibdi, fileName));
}
buffer = fibdi.NextEntryOffset == 0
? IntPtr.Zero
: new IntPtr(buffer.ToInt64() + fibdi.NextEntryOffset);
}
}
int lastError = Marshal.GetLastWin32Error();
switch ((uint)lastError)
{
case Win32Errors.ERROR_SUCCESS:
case Win32Errors.ERROR_NO_MORE_FILES:
case Win32Errors.ERROR_HANDLE_EOF:
yield break;
default:
NativeError.ThrowException(lastError, path);
break;
}
}
}
finally
{
// Handle is ours, dispose.
if (!callerHandle && safeHandle != null)
{
safeHandle.Close();
}
}
}
