internal static String InternalGetDirectoryRoot(String path)
{
if (path == null)
{
return(null);
}
return(path.Substring(0, PathHelpers.GetRootLength(path)));
}
internal DirectoryInfo(String fullPath, IFileSystemObject fileSystemObject) : base(fileSystemObject)
{
Debug.Assert(PathHelpers.GetRootLength(fullPath) > 0, "fullPath must be fully qualified!");
// Fast path when we know a DirectoryInfo exists.
OriginalPath = Path.GetFileName(fullPath);
FullPath = fullPath;
DisplayPath = GetDisplayName(OriginalPath, FullPath);
}
public static String GetDirectoryRoot(String path)
{
if (path == null)
{
throw new ArgumentNullException("path");
}
Contract.EndContractBlock();
String fullPath = PathHelpers.GetFullPathInternal(path);
String root = fullPath.Substring(0, PathHelpers.GetRootLength(fullPath));
return(root);
}
private static SafeFileHandle OpenHandle(string fullPath, bool asDirectory)
{
String root = fullPath.Substring(0, PathHelpers.GetRootLength(fullPath));
if (root == fullPath && root[1] == Path.VolumeSeparatorChar)
{
// intentionally not fullpath, most upstack public APIs expose this as path.
throw new ArgumentException(SR.Arg_PathIsVolume, "path");
}
Interop.mincore.SECURITY_ATTRIBUTES secAttrs = default(Interop.mincore.SECURITY_ATTRIBUTES);
SafeFileHandle handle = Helpers.SafeCreateFile(
fullPath,
(int)Interop.mincore.GenericOperations.GENERIC_WRITE,
FileShare.ReadWrite | FileShare.Delete,
ref secAttrs,
FileMode.Open,
asDirectory ? (int)Interop.mincore.FileOperations.FILE_FLAG_BACKUP_SEMANTICS : (int)FileOptions.None,
IntPtr.Zero
);
if (handle.IsInvalid)
{
int errorCode = Marshal.GetLastWin32Error();
// NT5 oddity - when trying to open "C:\" as a File,
// we usually get ERROR_PATH_NOT_FOUND from the OS. We should
// probably be consistent w/ every other directory.
if (!asDirectory && errorCode == Interop.mincore.Errors.ERROR_PATH_NOT_FOUND && fullPath.Equals(Directory.GetDirectoryRoot(fullPath)))
{
errorCode = Interop.mincore.Errors.ERROR_ACCESS_DENIED;
}
throw Win32Marshal.GetExceptionForWin32Error(errorCode, fullPath);
}
return(handle);
}
public override void CreateDirectory(string fullPath)
{
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 && PathHelpers.EndsInDirectorySeparator(fullPath))
{
length--;
}
int lengthRoot = PathHelpers.GetRootLength(fullPath);
// For UNC paths that are only // or ///
if (length == 2 && PathHelpers.IsDirectorySeparator(fullPath[1]))
{
throw new IOException(SR.Format(SR.IO_CannotCreateDirectory, 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 accessable 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 InternalExists may fail due
// to Win32 ACL's preventing us from seeing a directory, and this
// isn't threadsafe.
bool somepathexists = false;
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 && !PathHelpers.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.SECURITY_ATTRIBUTES secAttrs = default(Interop.SECURITY_ATTRIBUTES);
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);
if (name.Length >= Interop.MAX_DIRECTORY_PATH)
{
throw new PathTooLongException(SR.IO_PathTooLong);
}
r = Interop.mincore.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. InternalExists
// 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.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 (File.InternalExists(name) || (!DirectoryExists(name, out currentError) && currentError == Interop.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.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);
}
}
public override void CreateDirectory(string fullPath)
{
// NOTE: This logic is primarily just carried forward from Win32FileSystem.CreateDirectory.
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 && PathHelpers.EndsInDirectorySeparator(fullPath))
{
length--;
}
// For paths that are only // or ///
if (length == 2 && PathHelpers.IsDirectorySeparator(fullPath[1]))
{
throw new IOException(SR.Format(SR.IO_CannotCreateDirectory, fullPath));
}
// We can save a bunch of work if the directory we want to create already exists.
if (DirectoryExists(fullPath))
{
return;
}
// Attempt to figure out which directories don't exist, and only create the ones we need.
bool somepathexists = false;
Stack <string> stackDir = new Stack <string>();
int lengthRoot = PathHelpers.GetRootLength(fullPath);
if (length > lengthRoot)
{
int i = length - 1;
while (i >= lengthRoot && !somepathexists)
{
string dir = fullPath.Substring(0, i + 1);
if (!DirectoryExists(dir)) // Create only the ones missing
{
stackDir.Push(dir);
}
else
{
somepathexists = true;
}
while (i > lengthRoot && !PathHelpers.IsDirectorySeparator(fullPath[i]))
{
i--;
}
i--;
}
}
int count = stackDir.Count;
if (count == 0 && !somepathexists)
{
string root = Directory.InternalGetDirectoryRoot(fullPath);
if (!DirectoryExists(root))
{
throw Interop.GetExceptionForIoErrno(Interop.Errors.ENOENT, fullPath, isDirectory: true);
}
return;
}
// Create all the directories
int result = 0;
int firstError = 0;
string errorString = fullPath;
while (stackDir.Count > 0)
{
string name = stackDir.Pop();
if (name.Length >= MaxDirectoryPath)
{
throw new PathTooLongException(SR.IO_PathTooLong);
}
int errno = 0;
while ((result = Interop.libc.mkdir(name, (int)Interop.libc.Permissions.S_IRWXU)) < 0 && (errno = Marshal.GetLastWin32Error()) == Interop.Errors.EINTR)
{
;
}
if (result < 0 && firstError == 0)
{
// While we tried to avoid creating directories that don't
// exist above, there are a few cases that can fail, e.g.
// a race condition where another process or thread creates
// the directory first, or there's a file at the location.
if (errno != Interop.Errors.EEXIST)
{
firstError = errno;
}
else if (FileExists(name) || (!DirectoryExists(name, out errno) && errno == Interop.Errors.EACCES))
{
// 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.
firstError = errno;
errorString = name;
}
}
}
// Only throw an exception if creating the exact directory we wanted failed to work correctly.
if (result < 0 && firstError != 0)
{
throw Interop.GetExceptionForIoErrno(firstError, errorString, isDirectory: true);
}
}
private async Task <FileStreamBase> OpenAsync(string fullPath, FileMode mode, FileAccess access, FileShare share, int bufferSize, FileOptions options, FileStream parent)
{
// When trying to open the root directory, we need to throw an Access Denied
if (PathHelpers.GetRootLength(fullPath) == fullPath.Length)
{
throw Win32Marshal.GetExceptionForWin32Error(Interop.mincore.Errors.ERROR_ACCESS_DENIED, fullPath);
}
// Win32 CreateFile returns ERROR_PATH_NOT_FOUND when given a path that ends with '\'
if (PathHelpers.EndsInDirectorySeparator(fullPath))
{
throw Win32Marshal.GetExceptionForWin32Error(Interop.mincore.Errors.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, parent));
}
