|
static private GetExceptionForWin32Error ( int errorCode ) : |
||
| errorCode | int | |
| return | ||
private static unsafe void WriteSyncUsingAsyncHandle(SafeFileHandle handle, ReadOnlySpan <byte> buffer, long fileOffset)
{
if (buffer.IsEmpty)
{
return;
}
handle.EnsureThreadPoolBindingInitialized();
CallbackResetEvent resetEvent = new CallbackResetEvent(handle.ThreadPoolBinding !);
NativeOverlapped * overlapped = null;
try
{
overlapped = GetNativeOverlappedForAsyncHandle(handle.ThreadPoolBinding !, fileOffset, resetEvent);
fixed(byte *pinned = &MemoryMarshal.GetReference(buffer))
{
Interop.Kernel32.WriteFile(handle, pinned, buffer.Length, IntPtr.Zero, overlapped);
int errorCode = FileStreamHelpers.GetLastWin32ErrorAndDisposeHandleIfInvalid(handle);
if (errorCode == Interop.Errors.ERROR_IO_PENDING)
{
resetEvent.WaitOne();
errorCode = Interop.Errors.ERROR_SUCCESS;
}
if (errorCode == Interop.Errors.ERROR_SUCCESS)
{
int result = 0;
if (Interop.Kernel32.GetOverlappedResult(handle, overlapped, ref result, bWait: false))
{
Debug.Assert(result == buffer.Length, $"GetOverlappedResult returned {result} for {buffer.Length} bytes request");
return;
}
errorCode = FileStreamHelpers.GetLastWin32ErrorAndDisposeHandleIfInvalid(handle);
}
switch (errorCode)
{
case Interop.Errors.ERROR_NO_DATA:
// For pipes, ERROR_NO_DATA is not an error, but the pipe is closing.
return;
case Interop.Errors.ERROR_INVALID_PARAMETER:
// ERROR_INVALID_PARAMETER may be returned for writes
// where the position is too large or for synchronous writes
// to a handle opened asynchronously.
throw new IOException(SR.IO_FileTooLong);
default:
throw Win32Marshal.GetExceptionForWin32Error(errorCode, handle.Path);
}
}
}
finally
{
if (overlapped != null)
{
resetEvent.FreeNativeOverlapped(overlapped);
}
resetEvent.Dispose();
}
}
private SafeFileHandle OpenHandle(FileMode mode, FileShare share, FileOptions options)
{
Interop.Kernel32.SECURITY_ATTRIBUTES secAttrs = GetSecAttrs(share);
int fAccess =
((_access & FileAccess.Read) == FileAccess.Read ? GENERIC_READ : 0) |
((_access & FileAccess.Write) == FileAccess.Write ? GENERIC_WRITE : 0);
// Our Inheritable bit was stolen from Windows, but should be set in
// the security attributes class. Don't leave this bit set.
share &= ~FileShare.Inheritable;
// Must use a valid Win32 constant here...
if (mode == FileMode.Append)
{
mode = FileMode.OpenOrCreate;
}
int flagsAndAttributes = (int)options;
// For mitigating local elevation of privilege attack through named pipes
// make sure we always call CreateFile with SECURITY_ANONYMOUS so that the
// named pipe server can't impersonate a high privileged client security context
flagsAndAttributes |= (Interop.Kernel32.SecurityOptions.SECURITY_SQOS_PRESENT | Interop.Kernel32.SecurityOptions.SECURITY_ANONYMOUS);
// Don't pop up a dialog for reading from an empty floppy drive
uint oldMode = Interop.Kernel32.SetErrorMode(Interop.Kernel32.SEM_FAILCRITICALERRORS);
try
{
SafeFileHandle fileHandle = Interop.Kernel32.CreateFile(_path, fAccess, share, ref secAttrs, mode, flagsAndAttributes, IntPtr.Zero);
fileHandle.IsAsync = _useAsyncIO;
if (fileHandle.IsInvalid)
{
// Return a meaningful exception with the full path.
// NT5 oddity - when trying to open "C:\" as a Win32FileStream,
// we usually get ERROR_PATH_NOT_FOUND from the OS. We should
// probably be consistent w/ every other directory.
int errorCode = Marshal.GetLastWin32Error();
if (errorCode == Interop.Errors.ERROR_PATH_NOT_FOUND && _path.Length == PathInternal.GetRootLength(_path))
{
errorCode = Interop.Errors.ERROR_ACCESS_DENIED;
}
throw Win32Marshal.GetExceptionForWin32Error(errorCode, _path);
}
int fileType = Interop.Kernel32.GetFileType(fileHandle);
if (fileType != Interop.Kernel32.FileTypes.FILE_TYPE_DISK)
{
fileHandle.Dispose();
throw new NotSupportedException(SR.NotSupported_FileStreamOnNonFiles);
}
return(fileHandle);
}
finally
{
Interop.Kernel32.SetErrorMode(oldMode);
}
}
public static void CreateDirectory(string fullPath)
{
// We can save a bunch of work if the directory we want to create already exists. This also
// saves us in the case where sub paths are inaccessible (due to ERROR_ACCESS_DENIED) but the
// final path is accessible and the directory already exists. For example, consider trying
// to create c:\Foo\Bar\Baz, where everything already exists but ACLS prevent access to c:\Foo
// and c:\Foo\Bar. In that case, this code will think it needs to create c:\Foo, and c:\Foo\Bar
// and fail to due so, causing an exception to be thrown. This is not what we want.
if (DirectoryExists(fullPath))
{
return;
}
List <string> stackDir = new List <string>();
// Attempt to figure out which directories don't exist, and only
// create the ones we need. Note that FileExists may fail due
// to Win32 ACL's preventing us from seeing a directory, and this
// isn't threadsafe.
bool somepathexists = false;
int length = fullPath.Length;
// We need to trim the trailing slash or the code will try to create 2 directories of the same name.
if (length >= 2 && PathInternal.EndsInDirectorySeparator(fullPath))
{
length--;
}
int lengthRoot = PathInternal.GetRootLength(fullPath);
if (length > lengthRoot)
{
// Special case root (fullpath = X:\\)
int i = length - 1;
while (i >= lengthRoot && !somepathexists)
{
string dir = fullPath.Substring(0, i + 1);
if (!DirectoryExists(dir)) // Create only the ones missing
{
stackDir.Add(dir);
}
else
{
somepathexists = true;
}
while (i > lengthRoot && !PathInternal.IsDirectorySeparator(fullPath[i]))
{
i--;
}
i--;
}
}
int count = stackDir.Count;
// If we were passed a DirectorySecurity, convert it to a security
// descriptor and set it in he call to CreateDirectory.
Interop.Kernel32.SECURITY_ATTRIBUTES secAttrs = default;
bool r = true;
int firstError = 0;
string errorString = fullPath;
// If all the security checks succeeded create all the directories
while (stackDir.Count > 0)
{
string name = stackDir[stackDir.Count - 1];
stackDir.RemoveAt(stackDir.Count - 1);
r = Interop.Kernel32.CreateDirectory(name, ref secAttrs);
if (!r && (firstError == 0))
{
int currentError = Marshal.GetLastWin32Error();
// While we tried to avoid creating directories that don't
// exist above, there are at least two cases that will
// cause us to see ERROR_ALREADY_EXISTS here. FileExists
// can fail because we didn't have permission to the
// directory. Secondly, another thread or process could
// create the directory between the time we check and the
// time we try using the directory. Thirdly, it could
// fail because the target does exist, but is a file.
if (currentError != Interop.Errors.ERROR_ALREADY_EXISTS)
{
firstError = currentError;
}
else
{
// If there's a file in this directory's place, or if we have ERROR_ACCESS_DENIED when checking if the directory already exists throw.
if (FileExists(name) || (!DirectoryExists(name, out currentError) && currentError == Interop.Errors.ERROR_ACCESS_DENIED))
{
firstError = currentError;
errorString = name;
}
}
}
}
// We need this check to mask OS differences
// Handle CreateDirectory("X:\\") when X: doesn't exist. Similarly for n/w paths.
if ((count == 0) && !somepathexists)
{
string root = Directory.InternalGetDirectoryRoot(fullPath);
if (!DirectoryExists(root))
{
throw Win32Marshal.GetExceptionForWin32Error(Interop.Errors.ERROR_PATH_NOT_FOUND, root);
}
return;
}
// Only throw an exception if creating the exact directory we
// wanted failed to work correctly.
if (!r && (firstError != 0))
{
throw Win32Marshal.GetExceptionForWin32Error(firstError, errorString);
}
}
private async Task <FileStreamBase> OpenAsync(string fullPath, FileMode mode, FileAccess access, FileShare share, int bufferSize, FileOptions options)
{
// Win32 CreateFile returns ERROR_PATH_NOT_FOUND when given a path that ends with '\'
if (PathHelpers.EndsInDirectorySeparator(fullPath))
{
throw Win32Marshal.GetExceptionForWin32Error(Interop.ERROR_PATH_NOT_FOUND, fullPath);
}
StorageFile file = null;
// FileMode
if (mode == FileMode.Open || mode == FileMode.Truncate)
{
file = await StorageFile.GetFileFromPathAsync(fullPath).TranslateWinRTTask(fullPath);
}
else
{
CreationCollisionOption collisionOptions;
switch (mode)
{
case FileMode.Create:
collisionOptions = CreationCollisionOption.ReplaceExisting;
break;
case FileMode.CreateNew:
collisionOptions = CreationCollisionOption.FailIfExists;
break;
case FileMode.Append:
case FileMode.OpenOrCreate:
default:
collisionOptions = CreationCollisionOption.OpenIfExists;
break;
}
string directoryPath, fileName;
PathHelpers.SplitDirectoryFile(fullPath, out directoryPath, out fileName);
StorageFolder directory = await StorageFolder.GetFolderFromPathAsync(directoryPath).TranslateWinRTTask(directoryPath, isDirectory: true);
file = await directory.CreateFileAsync(fileName, collisionOptions).TranslateWinRTTask(fullPath);
}
// FileAccess: WinRT doesn't support FileAccessMode.Write so we upgrade to ReadWrite
FileAccessMode accessMode = ((access & FileAccess.Write) != 0) ? FileAccessMode.ReadWrite : FileAccessMode.Read;
// FileShare: cannot translate StorageFile uses a different sharing model (oplocks) that is controlled via FileAccessMode
// FileOptions: ignore most values of FileOptions as they are hints and are not supported by WinRT.
// FileOptions.Encrypted is not a hint, and not supported by WinRT, but there is precedent for ignoring this (FAT).
// FileOptions.DeleteOnClose should result in an UnauthorizedAccessException when
// opening a file that can only be read, but we cannot safely reproduce that behavior
// in WinRT without actually deleting the file.
// Instead the failure will occur in the finalizer for WinRTFileStream and be ignored.
// open our stream
Stream stream = (await file.OpenAsync(accessMode).TranslateWinRTTask(fullPath)).AsStream(bufferSize);
if (mode == FileMode.Append)
{
// seek to end.
stream.Seek(0, SeekOrigin.End);
}
else if (mode == FileMode.Truncate)
{
// truncate stream to 0
stream.SetLength(0);
}
return(new WinRTFileStream(stream, file, access, options));
}
/// <summary>
/// Gets reparse point information associated to <paramref name="linkPath"/>.
/// </summary>
/// <returns>The immediate link target, absolute or relative or null if the file is not a supported link.</returns>
internal static unsafe string?GetImmediateLinkTarget(string linkPath, bool isDirectory, bool throwOnError, bool returnFullPath)
{
using SafeFileHandle handle = OpenSafeFileHandle(linkPath,
Interop.Kernel32.FileOperations.FILE_FLAG_BACKUP_SEMANTICS |
Interop.Kernel32.FileOperations.FILE_FLAG_OPEN_REPARSE_POINT);
if (handle.IsInvalid)
{
if (!throwOnError)
{
return(null);
}
int error = Marshal.GetLastWin32Error();
// File not found doesn't make much sense coming from a directory.
if (isDirectory && error == Interop.Errors.ERROR_FILE_NOT_FOUND)
{
error = Interop.Errors.ERROR_PATH_NOT_FOUND;
}
throw Win32Marshal.GetExceptionForWin32Error(error, linkPath);
}
byte[] buffer = ArrayPool <byte> .Shared.Rent(Interop.Kernel32.MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
try
{
bool success = Interop.Kernel32.DeviceIoControl(
handle,
dwIoControlCode: Interop.Kernel32.FSCTL_GET_REPARSE_POINT,
lpInBuffer: IntPtr.Zero,
nInBufferSize: 0,
lpOutBuffer: buffer,
nOutBufferSize: Interop.Kernel32.MAXIMUM_REPARSE_DATA_BUFFER_SIZE,
out _,
IntPtr.Zero);
if (!success)
{
if (!throwOnError)
{
return(null);
}
int error = Marshal.GetLastWin32Error();
// The file or directory is not a reparse point.
if (error == Interop.Errors.ERROR_NOT_A_REPARSE_POINT)
{
return(null);
}
throw Win32Marshal.GetExceptionForWin32Error(error, linkPath);
}
Span <byte> bufferSpan = new(buffer);
success = MemoryMarshal.TryRead(bufferSpan, out Interop.Kernel32.SymbolicLinkReparseBuffer rbSymlink);
Debug.Assert(success);
// We always use SubstituteName(Offset|Length) instead of PrintName(Offset|Length),
// the latter is just the display name of the reparse point and it can show something completely unrelated to the target.
if (rbSymlink.ReparseTag == Interop.Kernel32.IOReparseOptions.IO_REPARSE_TAG_SYMLINK)
{
int offset = sizeof(Interop.Kernel32.SymbolicLinkReparseBuffer) + rbSymlink.SubstituteNameOffset;
int length = rbSymlink.SubstituteNameLength;
Span <char> targetPath = MemoryMarshal.Cast <byte, char>(bufferSpan.Slice(offset, length));
bool isRelative = (rbSymlink.Flags & Interop.Kernel32.SYMLINK_FLAG_RELATIVE) != 0;
if (!isRelative)
{
// Absolute target is in NT format and we need to clean it up before return it to the user.
if (targetPath.StartsWith(PathInternal.UncNTPathPrefix.AsSpan()))
{
// We need to prepend the Win32 equivalent of UNC NT prefix.
return(Path.Join(PathInternal.UncPathPrefix.AsSpan(), targetPath.Slice(PathInternal.UncNTPathPrefix.Length)));
}
return(GetTargetPathWithoutNTPrefix(targetPath));
}
else if (returnFullPath)
{
return(Path.Join(Path.GetDirectoryName(linkPath.AsSpan()), targetPath));
}
else
{
return(targetPath.ToString());
}
}
else if (rbSymlink.ReparseTag == Interop.Kernel32.IOReparseOptions.IO_REPARSE_TAG_MOUNT_POINT)
{
success = MemoryMarshal.TryRead(bufferSpan, out Interop.Kernel32.MountPointReparseBuffer rbMountPoint);
Debug.Assert(success);
int offset = sizeof(Interop.Kernel32.MountPointReparseBuffer) + rbMountPoint.SubstituteNameOffset;
int length = rbMountPoint.SubstituteNameLength;
Span <char> targetPath = MemoryMarshal.Cast <byte, char>(bufferSpan.Slice(offset, length));
// Unlike symbolic links, mount point paths cannot be relative.
Debug.Assert(!PathInternal.IsPartiallyQualified(targetPath));
// Mount points cannot point to a remote location.
Debug.Assert(!targetPath.StartsWith(PathInternal.UncNTPathPrefix.AsSpan()));
return(GetTargetPathWithoutNTPrefix(targetPath));
}
return(null);
}
finally
{
ArrayPool <byte> .Shared.Return(buffer);
}
private static void RemoveDirectoryRecursive(string fullPath, ref Interop.Kernel32.WIN32_FIND_DATA findData, bool topLevel)
{
int errorCode;
Exception exception = null;
using (SafeFindHandle handle = Interop.Kernel32.FindFirstFile(Path.Join(fullPath, "*"), ref findData))
{
if (handle.IsInvalid)
{
throw Win32Marshal.GetExceptionForLastWin32Error(fullPath);
}
do
{
if ((findData.dwFileAttributes & Interop.Kernel32.FileAttributes.FILE_ATTRIBUTE_DIRECTORY) == 0)
{
// File
string fileName = findData.cFileName.GetStringFromFixedBuffer();
if (!Interop.Kernel32.DeleteFile(Path.Combine(fullPath, fileName)) && exception == null)
{
errorCode = Marshal.GetLastWin32Error();
// We don't care if something else deleted the file first
if (errorCode != Interop.Errors.ERROR_FILE_NOT_FOUND)
{
exception = Win32Marshal.GetExceptionForWin32Error(errorCode, fileName);
}
}
}
else
{
// Directory, skip ".", "..".
if (findData.cFileName.FixedBufferEqualsString(".") || findData.cFileName.FixedBufferEqualsString(".."))
{
continue;
}
string fileName = findData.cFileName.GetStringFromFixedBuffer();
if (!IsNameSurrogateReparsePoint(ref findData))
{
// Not a reparse point, or the reparse point isn't a name surrogate, recurse.
try
{
RemoveDirectoryRecursive(
Path.Combine(fullPath, fileName),
findData: ref findData,
topLevel: false);
}
catch (Exception e)
{
if (exception == null)
{
exception = e;
}
}
}
else
{
// Name surrogate reparse point, don't recurse, simply remove the directory.
// If a mount point, we have to delete the mount point first.
if (findData.dwReserved0 == Interop.Kernel32.IOReparseOptions.IO_REPARSE_TAG_MOUNT_POINT)
{
// Mount point. Unmount using full path plus a trailing '\'.
// (Note: This doesn't remove the underlying directory)
string mountPoint = Path.Join(fullPath, fileName, PathInternal.DirectorySeparatorCharAsString);
if (!Interop.Kernel32.DeleteVolumeMountPoint(mountPoint) && exception == null)
{
errorCode = Marshal.GetLastWin32Error();
if (errorCode != Interop.Errors.ERROR_SUCCESS &&
errorCode != Interop.Errors.ERROR_PATH_NOT_FOUND)
{
exception = Win32Marshal.GetExceptionForWin32Error(errorCode, fileName);
}
}
}
// Note that RemoveDirectory on a symbolic link will remove the link itself.
if (!Interop.Kernel32.RemoveDirectory(Path.Combine(fullPath, fileName)) && exception == null)
{
errorCode = Marshal.GetLastWin32Error();
if (errorCode != Interop.Errors.ERROR_PATH_NOT_FOUND)
{
exception = Win32Marshal.GetExceptionForWin32Error(errorCode, fileName);
}
}
}
}
} while (Interop.Kernel32.FindNextFile(handle, ref findData));
if (exception != null)
{
throw exception;
}
errorCode = Marshal.GetLastWin32Error();
if (errorCode != Interop.Errors.ERROR_SUCCESS && errorCode != Interop.Errors.ERROR_NO_MORE_FILES)
{
throw Win32Marshal.GetExceptionForWin32Error(errorCode, fullPath);
}
}
// As we successfully removed all of the files we shouldn't care about the directory itself
// not being empty. As file deletion is just a marker to remove the file when all handles
// are closed we could still have contents hanging around.
RemoveDirectoryInternal(fullPath, topLevel: topLevel, allowDirectoryNotEmpty: true);
}
[System.Security.SecurityCritical] // auto-generated
private unsafe static string NormalizePath(string path, bool fullCheck, int maxPathLength, bool expandShortPaths)
{
Contract.Requires(path != null, "path can't be null");
// If the path is in extended syntax, we don't need to normalize, but we still do some basic validity checks
if (PathInternal.IsExtended(path))
{
if (!ValidateExtendedPath(path, fullCheck))
{
throw new ArgumentException(SR.Arg_PathIllegal);
}
// \\?\GLOBALROOT gives access to devices out of the scope of the current user, we
// don't want to allow this for security reasons.
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247.aspx#nt_namespaces
if (path.StartsWith(@"\\?\globalroot", StringComparison.OrdinalIgnoreCase))
{
throw new ArgumentException(SR.Arg_PathGlobalRoot);
}
return(path);
}
// If we're doing a full path check, trim whitespace and look for
// illegal path characters.
if (fullCheck)
{
// Trim whitespace off the end of the string.
// Win32 normalization trims only U+0020.
path = path.TrimEnd(TrimEndChars);
// Look for illegal path characters.
PathInternal.CheckInvalidPathChars(path);
}
int index = 0;
// We prefer to allocate on the stack for workingset/perf gain. If the
// starting path is less than MaxPath then we can stackalloc; otherwise we'll
// use a StringBuilder (PathHelper does this under the hood). The latter may
// happen in 2 cases:
// 1. Starting path is greater than MaxPath but it normalizes down to MaxPath.
// This is relevant for paths containing escape sequences. In this case, we
// attempt to normalize down to MaxPath, but the caller pays a perf penalty
// since StringBuilder is used.
// 2. IsolatedStorage, which supports paths longer than MaxPath (value given
// by maxPathLength.
PathHelper newBuffer = null;
if (path.Length + 1 <= MaxPath)
{
char *m_arrayPtr = stackalloc char[MaxPath];
newBuffer = new PathHelper(m_arrayPtr, MaxPath);
}
else
{
newBuffer = new PathHelper(path.Length + MaxPath, maxPathLength);
}
uint numSpaces = 0;
uint numDots = 0;
bool fixupDirectorySeparator = false;
// Number of significant chars other than potentially suppressible
// dots and spaces since the last directory or volume separator char
uint numSigChars = 0;
int lastSigChar = -1; // Index of last significant character.
// Whether this segment of the path (not the complete path) started
// with a volume separator char. Reject "c:...".
bool startedWithVolumeSeparator = false;
bool firstSegment = true;
int lastDirectorySeparatorPos = 0;
bool mightBeShortFileName = false;
// LEGACY: This code is here for backwards compatibility reasons. It
// ensures that \\foo.cs\bar.cs stays \\foo.cs\bar.cs instead of being
// turned into \foo.cs\bar.cs.
if (path.Length > 0 && PathInternal.IsDirectorySeparator(path[0]))
{
newBuffer.Append('\\');
index++;
lastSigChar = 0;
}
// Normalize the string, stripping out redundant dots, spaces, and
// slashes.
while (index < path.Length)
{
char currentChar = path[index];
// We handle both directory separators and dots specially. For
// directory separators, we consume consecutive appearances.
// For dots, we consume all dots beyond the second in
// succession. All other characters are added as is. In
// addition we consume all spaces after the last other char
// in a directory name up until the directory separator.
if (PathInternal.IsDirectorySeparator(currentChar))
{
// If we have a path like "123.../foo", remove the trailing dots.
// However, if we found "c:\temp\..\bar" or "c:\temp\...\bar", don't.
// Also remove trailing spaces from both files & directory names.
// This was agreed on with the OS team to fix undeletable directory
// names ending in spaces.
// If we saw a '\' as the previous last significant character and
// are simply going to write out dots, suppress them.
// If we only contain dots and slashes though, only allow
// a string like [dot]+ [space]*. Ignore everything else.
// Legal: "\.. \", "\...\", "\. \"
// Illegal: "\.. .\", "\. .\", "\ .\"
if (numSigChars == 0)
{
// Dot and space handling
if (numDots > 0)
{
// Look for ".[space]*" or "..[space]*"
int start = lastSigChar + 1;
if (path[start] != '.')
{
throw new ArgumentException(SR.Arg_PathIllegal);
}
// Only allow "[dot]+[space]*", and normalize the
// legal ones to "." or ".."
if (numDots >= 2)
{
// Reject "C:..."
if (startedWithVolumeSeparator && numDots > 2)
{
throw new ArgumentException(SR.Arg_PathIllegal);
}
if (path[start + 1] == '.')
{
// Search for a space in the middle of the
// dots and throw
for (int i = start + 2; i < start + numDots; i++)
{
if (path[i] != '.')
{
throw new ArgumentException(SR.Arg_PathIllegal);
}
}
numDots = 2;
}
else
{
if (numDots > 1)
{
throw new ArgumentException(SR.Arg_PathIllegal);
}
numDots = 1;
}
}
if (numDots == 2)
{
newBuffer.Append('.');
}
newBuffer.Append('.');
fixupDirectorySeparator = false;
// Continue in this case, potentially writing out '\'.
}
if (numSpaces > 0 && firstSegment)
{
// Handle strings like " \\server\share".
if (index + 1 < path.Length && PathInternal.IsDirectorySeparator(path[index + 1]))
{
newBuffer.Append(DirectorySeparatorChar);
}
}
}
numDots = 0;
numSpaces = 0; // Suppress trailing spaces
if (!fixupDirectorySeparator)
{
fixupDirectorySeparator = true;
newBuffer.Append(DirectorySeparatorChar);
}
numSigChars = 0;
lastSigChar = index;
startedWithVolumeSeparator = false;
firstSegment = false;
// For short file names, we must try to expand each of them as
// soon as possible. We need to allow people to specify a file
// name that doesn't exist using a path with short file names
// in it, such as this for a temp file we're trying to create:
// C:\DOCUME~1\USERNA~1.RED\LOCALS~1\Temp\bg3ylpzp
// We could try doing this afterwards piece by piece, but it's
// probably a lot simpler to do it here.
if (mightBeShortFileName)
{
newBuffer.TryExpandShortFileName();
mightBeShortFileName = false;
}
int thisPos = newBuffer.Length - 1;
if (thisPos - lastDirectorySeparatorPos > MaxComponentLength)
{
throw new PathTooLongException(SR.IO_PathTooLong);
}
lastDirectorySeparatorPos = thisPos;
} // if (Found directory separator)
else if (currentChar == '.')
{
// Reduce only multiple .'s only after slash to 2 dots. For
// instance a...b is a valid file name.
numDots++;
// Don't flush out non-terminal spaces here, because they may in
// the end not be significant. Turn "c:\ . .\foo" -> "c:\foo"
// which is the conclusion of removing trailing dots & spaces,
// as well as folding multiple '\' characters.
}
else if (currentChar == ' ')
{
numSpaces++;
}
else
{ // Normal character logic
if (currentChar == '~' && expandShortPaths)
{
mightBeShortFileName = true;
}
fixupDirectorySeparator = false;
// To reject strings like "C:...\foo" and "C :\foo"
if (firstSegment && currentChar == VolumeSeparatorChar)
{
// Only accept "C:", not "c :" or ":"
// Get a drive letter or ' ' if index is 0.
char driveLetter = (index > 0) ? path[index - 1] : ' ';
bool validPath = ((numDots == 0) && (numSigChars >= 1) && (driveLetter != ' '));
if (!validPath)
{
throw new ArgumentException(SR.Arg_PathIllegal);
}
startedWithVolumeSeparator = true;
// We need special logic to make " c:" work, we should not fix paths like " foo::$DATA"
if (numSigChars > 1)
{ // Common case, simply do nothing
int spaceCount = 0; // How many spaces did we write out, numSpaces has already been reset.
while ((spaceCount < newBuffer.Length) && newBuffer[spaceCount] == ' ')
{
spaceCount++;
}
if (numSigChars - spaceCount == 1)
{
//Safe to update stack ptr directly
newBuffer.Length = 0;
newBuffer.Append(driveLetter); // Overwrite spaces, we need a special case to not break " foo" as a relative path.
}
}
numSigChars = 0;
}
else
{
numSigChars += 1 + numDots + numSpaces;
}
// Copy any spaces & dots since the last significant character
// to here. Note we only counted the number of dots & spaces,
// and don't know what order they're in. Hence the copy.
if (numDots > 0 || numSpaces > 0)
{
int numCharsToCopy = (lastSigChar >= 0) ? index - lastSigChar - 1 : index;
if (numCharsToCopy > 0)
{
for (int i = 0; i < numCharsToCopy; i++)
{
newBuffer.Append(path[lastSigChar + 1 + i]);
}
}
numDots = 0;
numSpaces = 0;
}
newBuffer.Append(currentChar);
lastSigChar = index;
}
index++;
} // end while
if (newBuffer.Length - 1 - lastDirectorySeparatorPos > MaxComponentLength)
{
throw new PathTooLongException(SR.IO_PathTooLong);
}
// Drop any trailing dots and spaces from file & directory names, EXCEPT
// we MUST make sure that "C:\foo\.." is correctly handled.
// Also handle "C:\foo\." -> "C:\foo", while "C:\." -> "C:\"
if (numSigChars == 0)
{
if (numDots > 0)
{
// Look for ".[space]*" or "..[space]*"
int start = lastSigChar + 1;
if (path[start] != '.')
{
throw new ArgumentException(SR.Arg_PathIllegal);
}
// Only allow "[dot]+[space]*", and normalize the
// legal ones to "." or ".."
if (numDots >= 2)
{
// Reject "C:..."
if (startedWithVolumeSeparator && numDots > 2)
{
throw new ArgumentException(SR.Arg_PathIllegal);
}
if (path[start + 1] == '.')
{
// Search for a space in the middle of the
// dots and throw
for (int i = start + 2; i < start + numDots; i++)
{
if (path[i] != '.')
{
throw new ArgumentException(SR.Arg_PathIllegal);
}
}
numDots = 2;
}
else
{
if (numDots > 1)
{
throw new ArgumentException(SR.Arg_PathIllegal);
}
numDots = 1;
}
}
if (numDots == 2)
{
newBuffer.Append('.');
}
newBuffer.Append('.');
}
} // if (numSigChars == 0)
// If we ended up eating all the characters, bail out.
if (newBuffer.Length == 0)
{
throw new ArgumentException(SR.Arg_PathIllegal);
}
// Disallow URL's here. Some of our other Win32 API calls will reject
// them later, so we might be better off rejecting them here.
// Note we've probably turned them into "file:\D:\foo.tmp" by now.
// But for compatibility, ensure that callers that aren't doing a
// full check aren't rejected here.
if (fullCheck)
{
if (newBuffer.OrdinalStartsWith("http:", false) ||
newBuffer.OrdinalStartsWith("file:", false))
{
throw new ArgumentException(SR.Argument_PathUriFormatNotSupported);
}
}
// If the last part of the path (file or directory name) had a tilde,
// expand that too.
if (mightBeShortFileName)
{
newBuffer.TryExpandShortFileName();
}
// Call the Win32 API to do the final canonicalization step.
int result = 1;
if (fullCheck)
{
// NOTE: Win32 GetFullPathName requires the input buffer to be big enough to fit the initial
// path which is a concat of CWD and the relative path, this can be of an arbitrary
// size and could be > MaxPath (which becomes an artificial limit at this point),
// even though the final normalized path after fixing up the relative path syntax
// might be well within the MaxPath restriction. For ex,
// "c:\SomeReallyLongDirName(thinkGreaterThan_MAXPATH)\..\foo.txt" which actually requires a
// buffer well with in the MaxPath as the normalized path is just "c:\foo.txt"
// This buffer requirement seems wrong, it could be a bug or a perf optimization
// like returning required buffer length quickly or avoid stratch buffer etc.
// Either way we need to workaround it here...
// Ideally we would get the required buffer length first by calling GetFullPathName
// once without the buffer and use that in the later call but this doesn't always work
// due to Win32 GetFullPathName bug. For instance, in Win2k, when the path we are trying to
// fully qualify is a single letter name (such as "a", "1", ",") GetFullPathName
// fails to return the right buffer size (i.e, resulting in insufficient buffer).
// To workaround this bug we will start with MaxPath buffer and grow it once if the
// return value is > MaxPath.
result = newBuffer.GetFullPathName();
// If we called GetFullPathName with something like "foo" and our
// command window was in short file name mode (ie, by running edlin or
// DOS versions of grep, etc), we might have gotten back a short file
// name. So, check to see if we need to expand it.
mightBeShortFileName = false;
for (int i = 0; i < newBuffer.Length && !mightBeShortFileName; i++)
{
if (newBuffer[i] == '~' && expandShortPaths)
{
mightBeShortFileName = true;
}
}
if (mightBeShortFileName)
{
bool r = newBuffer.TryExpandShortFileName();
// Consider how the path "Doesn'tExist" would expand. If
// we add in the current directory, it too will need to be
// fully expanded, which doesn't happen if we use a file
// name that doesn't exist.
if (!r)
{
int lastSlash = -1;
for (int i = newBuffer.Length - 1; i >= 0; i--)
{
if (newBuffer[i] == DirectorySeparatorChar)
{
lastSlash = i;
break;
}
}
if (lastSlash >= 0)
{
// This bounds check is for safe memcpy but we should never get this far
if (newBuffer.Length >= maxPathLength)
{
throw new PathTooLongException(SR.IO_PathTooLong);
}
int lenSavedName = newBuffer.Length - lastSlash - 1;
Debug.Assert(lastSlash < newBuffer.Length, "path unexpectedly ended in a '\'");
newBuffer.Fixup(lenSavedName, lastSlash);
}
}
}
}
if (result != 0)
{
/* Throw an ArgumentException for paths like \\, \\server, \\server\
* This check can only be properly done after normalizing, so
\\foo\.. will be properly rejected. */
if (newBuffer.Length > 1 && newBuffer[0] == '\\' && newBuffer[1] == '\\')
{
int startIndex = 2;
while (startIndex < result)
{
if (newBuffer[startIndex] == '\\')
{
startIndex++;
break;
}
else
{
startIndex++;
}
}
if (startIndex == result)
{
throw new ArgumentException(SR.Arg_PathIllegalUNC);
}
}
}
// Check our result and form the managed string as necessary.
if (newBuffer.Length >= maxPathLength)
{
throw new PathTooLongException(SR.IO_PathTooLong);
}
if (result == 0)
{
int errorCode = Marshal.GetLastWin32Error();
if (errorCode == 0)
{
errorCode = Interop.mincore.Errors.ERROR_BAD_PATHNAME;
}
throw Win32Marshal.GetExceptionForWin32Error(errorCode, path);
}
string returnVal = newBuffer.ToString();
if (string.Equals(returnVal, path, StringComparison.Ordinal))
{
returnVal = path;
}
return(returnVal);
}
[System.Security.SecurityCritical] // auto-generated
private static void RemoveDirectoryHelper(string fullPath, bool recursive, bool throwOnTopLevelDirectoryNotFound)
{
bool r;
int errorCode;
Exception ex = null;
// Do not recursively delete through reparse points. Perhaps in a
// future version we will add a new flag to control this behavior,
// but for now we're much safer if we err on the conservative side.
// This applies to symbolic links and mount points.
// Note the logic to check whether fullPath is a reparse point is
// in Delete(String, String, bool), and will set "recursive" to false.
// Note that Win32's DeleteFile and RemoveDirectory will just delete
// the reparse point itself.
if (recursive)
{
Interop.mincore.WIN32_FIND_DATA data = new Interop.mincore.WIN32_FIND_DATA();
// Open a Find handle
using (SafeFindHandle hnd = Interop.mincore.FindFirstFile(Directory.EnsureTrailingDirectorySeparator(fullPath) + "*", ref data))
{
if (hnd.IsInvalid)
{
throw Win32Marshal.GetExceptionForLastWin32Error(fullPath);
}
do
{
bool isDir = (0 != (data.dwFileAttributes & Interop.mincore.FileAttributes.FILE_ATTRIBUTE_DIRECTORY));
if (isDir)
{
// Skip ".", "..".
if (data.cFileName.Equals(".") || data.cFileName.Equals(".."))
{
continue;
}
// Recurse for all directories, unless they are
// reparse points. Do not follow mount points nor
// symbolic links, but do delete the reparse point
// itself.
bool shouldRecurse = (0 == (data.dwFileAttributes & (int)FileAttributes.ReparsePoint));
if (shouldRecurse)
{
string newFullPath = Path.Combine(fullPath, data.cFileName);
try
{
RemoveDirectoryHelper(newFullPath, recursive, false);
}
catch (Exception e)
{
if (ex == null)
{
ex = e;
}
}
}
else
{
// Check to see if this is a mount point, and
// unmount it.
if (data.dwReserved0 == Interop.mincore.IOReparseOptions.IO_REPARSE_TAG_MOUNT_POINT)
{
// Use full path plus a trailing '\'
String mountPoint = Path.Combine(fullPath, data.cFileName + PathHelpers.DirectorySeparatorCharAsString);
if (!Interop.mincore.DeleteVolumeMountPoint(mountPoint))
{
errorCode = Marshal.GetLastWin32Error();
if (errorCode != Interop.mincore.Errors.ERROR_SUCCESS &&
errorCode != Interop.mincore.Errors.ERROR_PATH_NOT_FOUND)
{
try
{
throw Win32Marshal.GetExceptionForWin32Error(errorCode, data.cFileName);
}
catch (Exception e)
{
if (ex == null)
{
ex = e;
}
}
}
}
}
// RemoveDirectory on a symbolic link will
// remove the link itself.
String reparsePoint = Path.Combine(fullPath, data.cFileName);
r = Interop.mincore.RemoveDirectory(reparsePoint);
if (!r)
{
errorCode = Marshal.GetLastWin32Error();
if (errorCode != Interop.mincore.Errors.ERROR_PATH_NOT_FOUND)
{
try
{
throw Win32Marshal.GetExceptionForWin32Error(errorCode, data.cFileName);
}
catch (Exception e)
{
if (ex == null)
{
ex = e;
}
}
}
}
}
}
else
{
String fileName = Path.Combine(fullPath, data.cFileName);
r = Interop.mincore.DeleteFile(fileName);
if (!r)
{
errorCode = Marshal.GetLastWin32Error();
if (errorCode != Interop.mincore.Errors.ERROR_FILE_NOT_FOUND)
{
try
{
throw Win32Marshal.GetExceptionForWin32Error(errorCode, data.cFileName);
}
catch (Exception e)
{
if (ex == null)
{
ex = e;
}
}
}
}
}
} while (Interop.mincore.FindNextFile(hnd, ref data));
// Make sure we quit with a sensible error.
errorCode = Marshal.GetLastWin32Error();
}
if (ex != null)
{
throw ex;
}
if (errorCode != 0 && errorCode != Interop.mincore.Errors.ERROR_NO_MORE_FILES)
{
throw Win32Marshal.GetExceptionForWin32Error(errorCode, fullPath);
}
}
r = Interop.mincore.RemoveDirectory(fullPath);
if (!r)
{
errorCode = Marshal.GetLastWin32Error();
if (errorCode == Interop.mincore.Errors.ERROR_FILE_NOT_FOUND) // A dubious error code.
{
errorCode = Interop.mincore.Errors.ERROR_PATH_NOT_FOUND;
}
// This check was originally put in for Win9x (unfortunately without special casing it to be for Win9x only). We can't change the NT codepath now for backcomp reasons.
if (errorCode == Interop.mincore.Errors.ERROR_ACCESS_DENIED)
{
throw new IOException(SR.Format(SR.UnauthorizedAccess_IODenied_Path, fullPath));
}
// don't throw the DirectoryNotFoundException since this is a subdir and
// there could be a race condition between two Directory.Delete callers
if (errorCode == Interop.mincore.Errors.ERROR_PATH_NOT_FOUND && !throwOnTopLevelDirectoryNotFound)
{
return;
}
throw Win32Marshal.GetExceptionForWin32Error(errorCode, fullPath);
}
}
private unsafe Task <int> ReadAsyncInternal(Memory <byte> destination, CancellationToken cancellationToken = default)
{
if (!CanRead)
{
ThrowHelper.ThrowNotSupportedException_UnreadableStream();
}
Debug.Assert(!_fileHandle.IsClosed, "!_handle.IsClosed");
// Create and store async stream class library specific data in the async result
FileStreamCompletionSource completionSource = FileStreamCompletionSource.Create(this, _preallocatedOverlapped, 0, destination);
NativeOverlapped * intOverlapped = completionSource.Overlapped;
// Calculate position in the file we should be at after the read is done
if (CanSeek)
{
long len = Length;
// Make sure we are reading from the position that we think we are
VerifyOSHandlePosition();
if (destination.Length > len - _filePosition)
{
if (_filePosition <= len)
{
destination = destination.Slice(0, (int)(len - _filePosition));
}
else
{
destination = default;
}
}
// Now set the position to read from in the NativeOverlapped struct
// For pipes, we should leave the offset fields set to 0.
intOverlapped->OffsetLow = unchecked ((int)_filePosition);
intOverlapped->OffsetHigh = (int)(_filePosition >> 32);
// When using overlapped IO, the OS is not supposed to
// touch the file pointer location at all. We will adjust it
// ourselves. This isn't threadsafe.
// WriteFile should not update the file pointer when writing
// in overlapped mode, according to MSDN. But it does update
// the file pointer when writing to a UNC path!
// So changed the code below to seek to an absolute
// location, not a relative one. ReadFile seems consistent though.
SeekCore(_fileHandle, destination.Length, SeekOrigin.Current);
}
// queue an async ReadFile operation and pass in a packed overlapped
int r = FileStreamHelpers.ReadFileNative(_fileHandle, destination.Span, intOverlapped, out int errorCode);
// ReadFile, the OS version, will return 0 on failure. But
// my ReadFileNative wrapper returns -1. My wrapper will return
// the following:
// On error, r==-1.
// On async requests that are still pending, r==-1 w/ errorCode==ERROR_IO_PENDING
// on async requests that completed sequentially, r==0
// You will NEVER RELIABLY be able to get the number of bytes
// read back from this call when using overlapped structures! You must
// not pass in a non-null lpNumBytesRead to ReadFile when using
// overlapped structures! This is by design NT behavior.
if (r == -1)
{
// For pipes, when they hit EOF, they will come here.
if (errorCode == ERROR_BROKEN_PIPE)
{
// Not an error, but EOF. AsyncFSCallback will NOT be
// called. Call the user callback here.
// We clear the overlapped status bit for this special case.
// Failure to do so looks like we are freeing a pending overlapped later.
intOverlapped->InternalLow = IntPtr.Zero;
completionSource.SetCompletedSynchronously(0);
}
else if (errorCode != ERROR_IO_PENDING)
{
if (!_fileHandle.IsClosed && CanSeek) // Update Position - It could be anywhere.
{
SeekCore(_fileHandle, 0, SeekOrigin.Current);
}
completionSource.ReleaseNativeResource();
if (errorCode == ERROR_HANDLE_EOF)
{
ThrowHelper.ThrowEndOfFileException();
}
else
{
throw Win32Marshal.GetExceptionForWin32Error(errorCode, _path);
}
}
else if (cancellationToken.CanBeCanceled) // ERROR_IO_PENDING
{
// Only once the IO is pending do we register for cancellation
completionSource.RegisterForCancellation(cancellationToken);
}
}
else
{
// Due to a workaround for a race condition in NT's ReadFile &
// WriteFile routines, we will always be returning 0 from ReadFileNative
// when we do async IO instead of the number of bytes read,
// irregardless of whether the operation completed
// synchronously or asynchronously. We absolutely must not
// set asyncResult._numBytes here, since will never have correct
// results.
}
return(completionSource.Task);
}
private unsafe Task WriteAsyncInternalCore(ReadOnlyMemory <byte> source, CancellationToken cancellationToken)
{
if (!CanWrite)
{
ThrowHelper.ThrowNotSupportedException_UnwritableStream();
}
Debug.Assert(!_fileHandle.IsClosed, "!_handle.IsClosed");
// Create and store async stream class library specific data in the async result
FileStreamCompletionSource completionSource = FileStreamCompletionSource.Create(this, _preallocatedOverlapped, 0, source);
NativeOverlapped * intOverlapped = completionSource.Overlapped;
if (CanSeek)
{
// Make sure we set the length of the file appropriately.
long len = Length;
// Make sure we are writing to the position that we think we are
VerifyOSHandlePosition();
if (_filePosition + source.Length > len)
{
SetLengthCore(_filePosition + source.Length);
}
// Now set the position to read from in the NativeOverlapped struct
// For pipes, we should leave the offset fields set to 0.
intOverlapped->OffsetLow = (int)_filePosition;
intOverlapped->OffsetHigh = (int)(_filePosition >> 32);
// When using overlapped IO, the OS is not supposed to
// touch the file pointer location at all. We will adjust it
// ourselves. This isn't threadsafe.
SeekCore(_fileHandle, source.Length, SeekOrigin.Current);
}
// queue an async WriteFile operation and pass in a packed overlapped
int r = FileStreamHelpers.WriteFileNative(_fileHandle, source.Span, intOverlapped, out int errorCode);
// WriteFile, the OS version, will return 0 on failure. But
// my WriteFileNative wrapper returns -1. My wrapper will return
// the following:
// On error, r==-1.
// On async requests that are still pending, r==-1 w/ errorCode==ERROR_IO_PENDING
// On async requests that completed sequentially, r==0
// You will NEVER RELIABLY be able to get the number of bytes
// written back from this call when using overlapped IO! You must
// not pass in a non-null lpNumBytesWritten to WriteFile when using
// overlapped structures! This is ByDesign NT behavior.
if (r == -1)
{
// For pipes, when they are closed on the other side, they will come here.
if (errorCode == ERROR_NO_DATA)
{
// Not an error, but EOF. AsyncFSCallback will NOT be called.
// Completing TCS and return cached task allowing the GC to collect TCS.
completionSource.SetCompletedSynchronously(0);
return(Task.CompletedTask);
}
else if (errorCode != ERROR_IO_PENDING)
{
if (!_fileHandle.IsClosed && CanSeek) // Update Position - It could be anywhere.
{
SeekCore(_fileHandle, 0, SeekOrigin.Current);
}
completionSource.ReleaseNativeResource();
if (errorCode == ERROR_HANDLE_EOF)
{
ThrowHelper.ThrowEndOfFileException();
}
else
{
throw Win32Marshal.GetExceptionForWin32Error(errorCode, _path);
}
}
else if (cancellationToken.CanBeCanceled) // ERROR_IO_PENDING
{
// Only once the IO is pending do we register for cancellation
completionSource.RegisterForCancellation(cancellationToken);
}
}
else
{
// Due to a workaround for a race condition in NT's ReadFile &
// WriteFile routines, we will always be returning 0 from WriteFileNative
// when we do async IO instead of the number of bytes written,
// irregardless of whether the operation completed
// synchronously or asynchronously. We absolutely must not
// set asyncResult._numBytes here, since will never have correct
// results.
}
return(completionSource.Task);
}
private void HandleError(int errorCode, string path)
{
Dispose();
throw Win32Marshal.GetExceptionForWin32Error(errorCode, path);
}
private Exception HandleError(int errorCode, string path)
{
Dispose();
return(Win32Marshal.GetExceptionForWin32Error(errorCode, path));
}
private void HandleError(int hr, String path)
{
Dispose();
throw Win32Marshal.GetExceptionForWin32Error(hr, path);
}
private static unsafe int ReadSyncUsingAsyncHandle(SafeFileHandle handle, Span <byte> buffer, long fileOffset)
{
handle.EnsureThreadPoolBindingInitialized();
CallbackResetEvent resetEvent = new CallbackResetEvent(handle.ThreadPoolBinding !);
NativeOverlapped * overlapped = null;
try
{
overlapped = GetNativeOverlappedForAsyncHandle(handle, fileOffset, resetEvent);
fixed(byte *pinned = &MemoryMarshal.GetReference(buffer))
{
Interop.Kernel32.ReadFile(handle, pinned, buffer.Length, IntPtr.Zero, overlapped);
int errorCode = FileStreamHelpers.GetLastWin32ErrorAndDisposeHandleIfInvalid(handle);
if (errorCode == Interop.Errors.ERROR_IO_PENDING)
{
resetEvent.WaitOne();
errorCode = Interop.Errors.ERROR_SUCCESS;
}
if (errorCode == Interop.Errors.ERROR_SUCCESS)
{
int result = 0;
if (Interop.Kernel32.GetOverlappedResult(handle, overlapped, ref result, bWait: false))
{
Debug.Assert(result >= 0 && result <= buffer.Length, $"GetOverlappedResult returned {result} for {buffer.Length} bytes request");
return(result);
}
errorCode = FileStreamHelpers.GetLastWin32ErrorAndDisposeHandleIfInvalid(handle);
}
switch (errorCode)
{
case Interop.Errors.ERROR_HANDLE_EOF: // logically success with 0 bytes read (read at end of file)
case Interop.Errors.ERROR_BROKEN_PIPE:
case Interop.Errors.ERROR_INVALID_PARAMETER when IsEndOfFileForNoBuffering(handle, fileOffset):
// EOF on a pipe. Callback will not be called.
// We clear the overlapped status bit for this special case (failure
// to do so looks like we are freeing a pending overlapped later).
overlapped->InternalLow = IntPtr.Zero;
return(0);
default:
throw Win32Marshal.GetExceptionForWin32Error(errorCode, handle.Path);
}
}
}
finally
{
if (overlapped != null)
{
resetEvent.FreeNativeOverlapped(overlapped);
}
resetEvent.Dispose();
}
}
private static void RemoveDirectoryRecursive(string fullPath, ref Interop.Kernel32.WIN32_FIND_DATA findData, bool topLevel)
{
int errorCode;
Exception exception = null;
using (SafeFindHandle handle = Interop.Kernel32.FindFirstFile(Directory.EnsureTrailingDirectorySeparator(fullPath) + "*", ref findData))
{
if (handle.IsInvalid)
{
throw Win32Marshal.GetExceptionForLastWin32Error(fullPath);
}
do
{
if ((findData.dwFileAttributes & Interop.Kernel32.FileAttributes.FILE_ATTRIBUTE_DIRECTORY) == 0)
{
// File
string fileName = findData.cFileName.GetStringFromFixedBuffer();
if (!Interop.Kernel32.DeleteFile(Path.Combine(fullPath, fileName)) && exception == null)
{
errorCode = Marshal.GetLastWin32Error();
// We don't care if something else deleted the file first
if (errorCode != Interop.Errors.ERROR_FILE_NOT_FOUND)
{
exception = Win32Marshal.GetExceptionForWin32Error(errorCode, fileName);
}
}
}
else
{
// Directory, skip ".", "..".
if (findData.cFileName.FixedBufferEqualsString(".") || findData.cFileName.FixedBufferEqualsString(".."))
{
continue;
}
string fileName = findData.cFileName.GetStringFromFixedBuffer();
if ((findData.dwFileAttributes & (int)FileAttributes.ReparsePoint) == 0)
{
// Not a reparse point, recurse.
try
{
RemoveDirectoryRecursive(
Path.Combine(fullPath, fileName),
findData: ref findData,
topLevel: false);
}
catch (Exception e)
{
if (exception == null)
{
exception = e;
}
}
}
else
{
// Reparse point, don't recurse, just remove. (dwReserved0 is documented for this flag)
if (findData.dwReserved0 == Interop.Kernel32.IOReparseOptions.IO_REPARSE_TAG_MOUNT_POINT)
{
// Mount point. Unmount using full path plus a trailing '\'.
// (Note: This doesn't remove the underlying directory)
string mountPoint = Path.Combine(fullPath, fileName + PathHelpers.DirectorySeparatorCharAsString);
if (!Interop.Kernel32.DeleteVolumeMountPoint(mountPoint) && exception == null)
{
errorCode = Marshal.GetLastWin32Error();
if (errorCode != Interop.Errors.ERROR_SUCCESS &&
errorCode != Interop.Errors.ERROR_PATH_NOT_FOUND)
{
exception = Win32Marshal.GetExceptionForWin32Error(errorCode, fileName);
}
}
}
// Note that RemoveDirectory on a symbolic link will remove the link itself.
if (!Interop.Kernel32.RemoveDirectory(Path.Combine(fullPath, fileName)) && exception == null)
{
errorCode = Marshal.GetLastWin32Error();
if (errorCode != Interop.Errors.ERROR_PATH_NOT_FOUND)
{
exception = Win32Marshal.GetExceptionForWin32Error(errorCode, fileName);
}
}
}
}
} while (Interop.Kernel32.FindNextFile(handle, ref findData));
if (exception != null)
{
throw exception;
}
errorCode = Marshal.GetLastWin32Error();
if (errorCode != Interop.Errors.ERROR_SUCCESS && errorCode != Interop.Errors.ERROR_NO_MORE_FILES)
{
throw Win32Marshal.GetExceptionForWin32Error(errorCode, fullPath);
}
}
RemoveDirectoryInternal(fullPath, topLevel: topLevel);
}