private SafeFindFileHandle FindFirstFile(string pathLp, out NativeMethods.WIN32_FIND_DATA win32FindData)
{
SafeFindFileHandle handle = Transaction == null || !NativeMethods.IsAtLeastWindowsVista
// FindFirstFileEx() / FindFirstFileTransacted()
// In the ANSI version of this function, the name is limited to MAX_PATH characters.
// To extend this limit to 32,767 wide characters, call the Unicode version of the function and prepend "\\?\" to the path.
// 2013-01-13: MSDN confirms LongPath usage.
// A trailing backslash is not allowed.
? NativeMethods.FindFirstFileEx(Path.RemoveTrailingDirectorySeparator(pathLp, false), FindExInfoLevel, out win32FindData, _limitSearchToDirs, IntPtr.Zero, LargeCache)
: NativeMethods.FindFirstFileTransacted(Path.RemoveTrailingDirectorySeparator(pathLp, false), FindExInfoLevel, out win32FindData, _limitSearchToDirs, IntPtr.Zero, LargeCache, Transaction.SafeHandle);
int lastError = Marshal.GetLastWin32Error();
if (handle != null && handle.IsInvalid)
{
handle.Close();
if (!ContinueOnException)
{
switch ((uint)lastError)
{
case Win32Errors.ERROR_FILE_NOT_FOUND:
case Win32Errors.ERROR_PATH_NOT_FOUND:
// MSDN: .NET 3.5+: DirectoryNotFoundException: Path is invalid, such as referring to an unmapped drive.
// Directory.Delete()
NativeError.ThrowException(IsDirectory ? (int)Win32Errors.ERROR_PATH_NOT_FOUND : Win32Errors.ERROR_FILE_NOT_FOUND, pathLp);
break;
case Win32Errors.ERROR_DIRECTORY:
// MSDN: .NET 3.5+: IOException: path is a file name.
// Directory.EnumerateDirectories()
// Directory.EnumerateFiles()
// Directory.EnumerateFileSystemEntries()
// Directory.GetDirectories()
// Directory.GetFiles()
// Directory.GetFileSystemEntries()
NativeError.ThrowException(lastError, pathLp);
break;
case Win32Errors.ERROR_ACCESS_DENIED:
// MSDN: .NET 3.5+: UnauthorizedAccessException: The caller does not have the required permission.
NativeError.ThrowException(lastError, pathLp);
break;
}
// MSDN: .NET 3.5+: IOException
NativeError.ThrowException(lastError, pathLp);
}
}
return(handle);
}
public FileSystemEntryInfo Get()
{
NativeMethods.Win32FindData win32FindData;
// ChangeErrorMode is for the Win32 SetThreadErrorMode() method, used to suppress possible pop-ups.
using (new NativeMethods.ChangeErrorMode(NativeMethods.ErrorMode.FailCriticalErrors))
using (SafeFindFileHandle handle = FindFirstFile(InputPath, out win32FindData))
{
return(handle.IsInvalid ? null : new FileSystemEntryInfo(win32FindData)
{
FullPath = InputPath
});
}
}
public T Get <T>()
{
NativeMethods.WIN32_FIND_DATA win32FindData;
// ChangeErrorMode is for the Win32 SetThreadErrorMode() method, used to suppress possible pop-ups.
using (new NativeMethods.ChangeErrorMode(NativeMethods.ErrorMode.FailCriticalErrors))
using (SafeFindFileHandle handle = FindFirstFile(InputPath, out win32FindData))
{
if (handle != null && !handle.IsInvalid)
{
return(NewFileSystemEntryType <T>(win32FindData, InputPath, (win32FindData.dwFileAttributes & FileAttributes.Directory) != 0));
}
}
return((T)(object)null);
}
/// <summary>[AlphaFS] Enumerates the streams of type :$DATA from the specified file or directory.</summary>
/// <param name="transaction">The transaction.</param>
/// <param name="path">The path to the file or directory to enumerate streams of.</param>
/// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
/// <returns>The streams of type :$DATA in the specified file or directory.</returns>
internal static IEnumerable <AlternateDataStreamInfo> EnumerateAlternateDataStreamsCore(KernelTransaction transaction, string path, PathFormat pathFormat)
{
using (var buffer = new SafeGlobalMemoryBufferHandle(Marshal.SizeOf(typeof(NativeMethods.WIN32_FIND_STREAM_DATA))))
{
string pathLp = Path.GetExtendedLengthPathCore(transaction, path, pathFormat,
GetFullPathOptions.RemoveTrailingDirectorySeparator | GetFullPathOptions.CheckInvalidPathChars |
GetFullPathOptions.CheckAdditional);
using (SafeFindFileHandle handle = transaction == null
? NativeMethods.FindFirstStreamW(pathLp, NativeMethods.STREAM_INFO_LEVELS.FindStreamInfoStandard, buffer, 0)
: NativeMethods.FindFirstStreamTransactedW(pathLp, NativeMethods.STREAM_INFO_LEVELS.FindStreamInfoStandard, buffer, 0, transaction.SafeHandle))
{
int errorCode = Marshal.GetLastWin32Error();
if (handle.IsInvalid)
{
if (errorCode == Win32Errors.ERROR_HANDLE_EOF)
{
yield break;
}
NativeError.ThrowException(errorCode);
}
while (true)
{
yield return(new AlternateDataStreamInfo(pathLp, buffer.PtrToStructure <NativeMethods.WIN32_FIND_STREAM_DATA>(0)));
if (!NativeMethods.FindNextStreamW(handle, buffer))
{
int lastError = Marshal.GetLastWin32Error();
if (lastError == Win32Errors.ERROR_HANDLE_EOF)
{
break;
}
NativeError.ThrowException(lastError, pathLp);
}
}
}
}
}
static internal extern bool FindNextFileW([In] SafeFindFileHandle hFindFile, [In, Out] WIN32_FIND_DATA lpFindFileData);
internal static int FillAttributeInfoCore(KernelTransaction transaction, string pathLp, ref NativeMethods.WIN32_FILE_ATTRIBUTE_DATA win32AttrData, bool tryagain, bool returnErrorOnNotFound)
{
int dataInitialised = (int)Win32Errors.ERROR_SUCCESS;
#region Try Again
// Someone has a handle to the file open, or other error.
if (tryagain)
{
NativeMethods.WIN32_FIND_DATA findData;
// ChangeErrorMode is for the Win32 SetThreadErrorMode() method, used to suppress possible pop-ups.
using (new NativeMethods.ChangeErrorMode(NativeMethods.ErrorMode.FailCriticalErrors))
{
bool error = false;
SafeFindFileHandle handle = transaction == null || !NativeMethods.IsAtLeastWindowsVista
// FindFirstFileEx() / FindFirstFileTransacted()
// In the ANSI version of this function, the name is limited to MAX_PATH characters.
// To extend this limit to 32,767 wide characters, call the Unicode version of the function and prepend "\\?\" to the path.
// 2013-01-13: MSDN confirms LongPath usage.
// A trailing backslash is not allowed.
? NativeMethods.FindFirstFileEx(Path.RemoveTrailingDirectorySeparator(pathLp, false), NativeMethods.FindexInfoLevels, out findData, NativeMethods.FINDEX_SEARCH_OPS.SearchNameMatch, IntPtr.Zero, NativeMethods.LargeCache)
: NativeMethods.FindFirstFileTransacted(Path.RemoveTrailingDirectorySeparator(pathLp, false), NativeMethods.FindexInfoLevels, out findData, NativeMethods.FINDEX_SEARCH_OPS.SearchNameMatch, IntPtr.Zero, NativeMethods.LargeCache, transaction.SafeHandle);
try
{
if (handle != null && handle.IsInvalid)
{
error = true;
dataInitialised = Marshal.GetLastWin32Error();
if (dataInitialised == Win32Errors.ERROR_FILE_NOT_FOUND ||
dataInitialised == Win32Errors.ERROR_PATH_NOT_FOUND ||
dataInitialised == Win32Errors.ERROR_NOT_READY) // Floppy device not ready.
{
if (!returnErrorOnNotFound)
{
// Return default value for backward compatibility
dataInitialised = (int)Win32Errors.ERROR_SUCCESS;
win32AttrData.dwFileAttributes = (FileAttributes)(-1);
}
}
return(dataInitialised);
}
}
finally
{
try
{
if (handle != null)
{
handle.Close();
}
}
catch
{
// If we're already returning an error, don't throw another one.
if (!error)
{
NativeError.ThrowException(dataInitialised, pathLp);
}
}
}
}
// Copy the attribute information.
win32AttrData = new NativeMethods.WIN32_FILE_ATTRIBUTE_DATA(findData);
}
#endregion // Try Again
else
{
using (new NativeMethods.ChangeErrorMode(NativeMethods.ErrorMode.FailCriticalErrors))
{
if (!(transaction == null || !NativeMethods.IsAtLeastWindowsVista
// GetFileAttributesEx() / GetFileAttributesTransacted()
// In the ANSI version of this function, the name is limited to MAX_PATH characters.
// To extend this limit to 32,767 wide characters, call the Unicode version of the function and prepend "\\?\" to the path.
// 2013-01-13: MSDN confirms LongPath usage.
? NativeMethods.GetFileAttributesEx(pathLp, NativeMethods.GetFileExInfoLevels.GetFileExInfoStandard, out win32AttrData)
: NativeMethods.GetFileAttributesTransacted(pathLp, NativeMethods.GetFileExInfoLevels.GetFileExInfoStandard, out win32AttrData, transaction.SafeHandle)))
{
dataInitialised = Marshal.GetLastWin32Error();
if (dataInitialised != Win32Errors.ERROR_FILE_NOT_FOUND &&
dataInitialised != Win32Errors.ERROR_PATH_NOT_FOUND &&
dataInitialised != Win32Errors.ERROR_NOT_READY) // Floppy device not ready.
{
// In case someone latched onto the file. Take the perf hit only for failure.
return(FillAttributeInfoCore(transaction, pathLp, ref win32AttrData, true, returnErrorOnNotFound));
}
if (!returnErrorOnNotFound)
{
// Return default value for backward compbatibility.
dataInitialised = (int)Win32Errors.ERROR_SUCCESS;
win32AttrData.dwFileAttributes = (FileAttributes)(-1);
}
}
}
}
return(dataInitialised);
}
public IEnumerable <FileSystemEntryInfo> Enumerate()
{
// MSDN: Queue
// Represents a first-in, first-out collection of objects.
// The capacity of a Queue is the number of elements the Queue can hold.
// As elements are added to a Queue, the capacity is automatically increased as required through reallocation. The capacity can be decreased by calling TrimToSize.
// The growth factor is the number by which the current capacity is multiplied when a greater capacity is required. The growth factor is determined when the Queue is constructed.
// The capacity of the Queue will always increase by a minimum value, regardless of the growth factor; a growth factor of 1.0 will not prevent the Queue from increasing in size.
// If the size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the Queue.
// This constructor is an O(n) operation, where n is capacity.
Queue <string> dirs = new Queue <string>(1000);
// Removes the object at the beginning of your Queue.
// The algorithmic complexity of this is O(1). It doesn't loop over elements.
dirs.Enqueue(InputPath);
// ChangeErrorMode is for the Win32 SetThreadErrorMode() method, used to suppress possible pop-ups.
using (new NativeMethods.ChangeErrorMode(NativeMethods.ErrorMode.FailCriticalErrors))
while (dirs.Count > 0)
{
string path = Path.AddDirectorySeparator(dirs.Dequeue(), false);
string pathLp = path + Path.WildcardStarMatchAll;
NativeMethods.Win32FindData win32FindData;
using (SafeFindFileHandle handle = FindFirstFile(pathLp, out win32FindData))
{
if (handle.IsInvalid && ContinueOnException)
{
continue;
}
do
{
string fileName = win32FindData.FileName;
switch (fileName)
{
// Skip entries.
case ".":
case "..":
break;
default:
string fullPathLp = path + fileName;
bool fseiIsDir = (win32FindData.FileAttributes & FileAttributes.Directory) == FileAttributes.Directory;
// Or not: Skip on reparse points here to cleanly separate regular directories from links.
if (SkipReparsePoints &&
(win32FindData.FileAttributes & FileAttributes.ReparsePoint) == FileAttributes.ReparsePoint)
{
continue;
}
// If object is a directory, add it to the queue for later traversal.
if (fseiIsDir && _searchAllDirs)
{
dirs.Enqueue(fullPathLp);
}
if (!(_nameFilter == null || (_nameFilter != null && _nameFilter.IsMatch(fileName))))
{
break;
}
// Make sure the requested file system object type is returned.
// null = Return files and directories.
// true = Return only directories.
// false = Return only files.
switch (FileSystemObjectType)
{
case null:
yield return(new FileSystemEntryInfo(win32FindData)
{
FullPath = fullPathLp
});
break;
case true:
if (fseiIsDir)
{
yield return new FileSystemEntryInfo(win32FindData)
{
FullPath = fullPathLp
}
}
;
break;
case false:
if (!fseiIsDir)
{
yield return new FileSystemEntryInfo(win32FindData)
{
FullPath = fullPathLp
}
}
;
break;
}
break;
}
} while (NativeMethods.FindNextFile(handle, out win32FindData));
uint lastError = (uint)Marshal.GetLastWin32Error();
switch (lastError)
{
case Win32Errors.ERROR_NO_MORE_FILES:
lastError = Win32Errors.NO_ERROR;
break;
case Win32Errors.ERROR_FILE_NOT_FOUND:
case Win32Errors.ERROR_PATH_NOT_FOUND:
if (lastError == Win32Errors.ERROR_FILE_NOT_FOUND && IsFolder)
{
lastError = Win32Errors.ERROR_PATH_NOT_FOUND;
}
break;
}
if (!ContinueOnException && lastError != Win32Errors.NO_ERROR)
{
NativeError.ThrowException(lastError, InputPath);
}
}
}
}
internal static extern bool FindNextStreamW(SafeFindFileHandle handle,
SafeGlobalMemoryBufferHandle lpFindStreamData);
internal static extern bool FindNextFileName(SafeFindFileHandle hFindStream,
[MarshalAs(UnmanagedType.U4)] out uint stringLength, StringBuilder linkName);
internal static extern bool FindNextFile(SafeFindFileHandle hFindFile, out Win32FindData lpFindFileData);
/// <summary>[AlphaFS] Creates an enumeration of all the hard links to the specified <paramref name="path"/>.</summary>
/// <exception cref="PlatformNotSupportedException">Thrown when a Platform Not Supported error condition occurs.</exception>
/// <param name="transaction">The transaction.</param>
/// <param name="path">The name of the file.</param>
/// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
/// <returns>An enumerable collection of <see cref="string"/> of all the hard links to the specified <paramref name="path"/></returns>
internal static IEnumerable <string> EnumerateHardlinksInternal(KernelTransaction transaction, string path, PathFormat pathFormat)
{
if (!NativeMethods.IsAtLeastWindowsVista)
{
throw new PlatformNotSupportedException(Resources.RequiresWindowsVistaOrHigher);
}
string pathLp = Path.GetExtendedLengthPathInternal(transaction, path, pathFormat, GetFullPathOptions.RemoveTrailingDirectorySeparator | GetFullPathOptions.FullCheck);
// Default buffer length, will be extended if needed, although this should not happen.
uint length = NativeMethods.MaxPathUnicode;
StringBuilder builder = new StringBuilder((int)length);
getFindFirstFileName:
using (SafeFindFileHandle handle = transaction == null
// FindFirstFileName() / FindFirstFileNameTransacted()
// In the ANSI version of this function, the name is limited to MAX_PATH characters.
// To extend this limit to 32,767 wide characters, call the Unicode version of the function and prepend "\\?\" to the path.
// 2013-01-13: MSDN does not confirm LongPath usage but a Unicode version of this function exists.
? NativeMethods.FindFirstFileName(pathLp, 0, out length, builder)
: NativeMethods.FindFirstFileNameTransacted(pathLp, 0, out length, builder, transaction.SafeHandle))
{
if (handle.IsInvalid)
{
int lastError = Marshal.GetLastWin32Error();
switch ((uint)lastError)
{
case Win32Errors.ERROR_MORE_DATA:
builder = new StringBuilder((int)length);
handle.Close();
goto getFindFirstFileName;
default:
// If the function fails, the return value is INVALID_HANDLE_VALUE.
NativeError.ThrowException(lastError, pathLp);
break;
}
}
yield return(builder.ToString());
//length = NativeMethods.MaxPathUnicode;
//builder = new StringBuilder((int)length);
do
{
while (!NativeMethods.FindNextFileName(handle, out length, builder))
{
int lastError = Marshal.GetLastWin32Error();
switch ((uint)lastError)
{
// We've reached the end of the enumeration.
case Win32Errors.ERROR_HANDLE_EOF:
yield break;
case Win32Errors.ERROR_MORE_DATA:
builder = new StringBuilder((int)length);
continue;
default:
//If the function fails, the return value is zero (0).
NativeError.ThrowException(lastError);
break;
}
}
yield return(builder.ToString());
} while (true);
}
}
static internal extern bool FindNextFileW([In] SafeFindFileHandle hFindFile, [In, Out] FileSystemEntryInfo lpFindFileData);
public IEnumerable <T> Enumerate <T>()
{
// MSDN: Queue
// Represents a first-in, first-out collection of objects.
// The capacity of a Queue is the number of elements the Queue can hold.
// As elements are added to a Queue, the capacity is automatically increased as required through reallocation. The capacity can be decreased by calling TrimToSize.
// The growth factor is the number by which the current capacity is multiplied when a greater capacity is required. The growth factor is determined when the Queue is constructed.
// The capacity of the Queue will always increase by a minimum value, regardless of the growth factor; a growth factor of 1.0 will not prevent the Queue from increasing in size.
// If the size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the Queue.
// This constructor is an O(n) operation, where n is capacity.
var dirs = new Queue <string>(1000);
// Removes the object at the beginning of your Queue.
// The algorithmic complexity of this is O(1). It doesn't loop over elements.
dirs.Enqueue(InputPath);
// ChangeErrorMode is for the Win32 SetThreadErrorMode() method, used to suppress possible pop-ups.
using (new NativeMethods.ChangeErrorMode(NativeMethods.ErrorMode.FailCriticalErrors))
while (dirs.Count > 0)
{
string path = Path.AddTrailingDirectorySeparator(dirs.Dequeue(), false);
string pathLp = path + Path.WildcardStarMatchAll;
NativeMethods.WIN32_FIND_DATA win32FindData;
using (SafeFindFileHandle handle = FindFirstFile(pathLp, out win32FindData))
{
if (handle != null && handle.IsInvalid && ContinueOnException)
{
handle.Close();
continue;
}
do
{
string fileName = win32FindData.cFileName;
// Skip entries "." and ".."
if (fileName.Equals(Path.CurrentDirectoryPrefix, StringComparison.OrdinalIgnoreCase) ||
fileName.Equals(Path.ParentDirectoryPrefix, StringComparison.OrdinalIgnoreCase))
{
continue;
}
// Skip reparse points here to cleanly separate regular directories from links.
if (SkipReparsePoints && (win32FindData.dwFileAttributes & FileAttributes.ReparsePoint) != 0)
{
continue;
}
string fseiFullPathLp = path + fileName;
bool fseiIsFolder = (win32FindData.dwFileAttributes & FileAttributes.Directory) != 0;
// If object is a directory, add it to the queue for later traversal.
if (fseiIsFolder && Recursive)
{
dirs.Enqueue(fseiFullPathLp);
}
// Determine yield.
if (!(_nameFilter == null || (_nameFilter != null && _nameFilter.IsMatch(fileName))))
{
continue;
}
var res = NewFileSystemEntryType <T>(win32FindData, fseiFullPathLp, fseiIsFolder);
if (res == null)
{
continue;
}
yield return(res);
} while (NativeMethods.FindNextFile(handle, out win32FindData));
var lastError = (uint)Marshal.GetLastWin32Error();
if (!ContinueOnException)
{
switch (lastError)
{
case Win32Errors.ERROR_NO_MORE_FILES:
lastError = Win32Errors.NO_ERROR;
break;
case Win32Errors.ERROR_FILE_NOT_FOUND:
case Win32Errors.ERROR_PATH_NOT_FOUND:
if (lastError == Win32Errors.ERROR_FILE_NOT_FOUND && IsDirectory)
{
lastError = Win32Errors.ERROR_PATH_NOT_FOUND;
}
break;
}
if (lastError != Win32Errors.NO_ERROR)
{
NativeError.ThrowException(lastError, pathLp);
}
}
}
}
}
