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 && PathInternal.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 = PathInternal.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 && !PathInternal.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.Error.ENOENT.Info(), fullPath, isDirectory: true);
}
return;
}
// Create all the directories
int result = 0;
Interop.ErrorInfo firstError = default(Interop.ErrorInfo);
string errorString = fullPath;
while (stackDir.Count > 0)
{
string name = stackDir.Pop();
if (name.Length >= MaxDirectoryPath)
{
throw new PathTooLongException(SR.IO_PathTooLong);
}
// The mkdir command uses 0777 by default (it'll be AND'd with the process umask internally).
// We do the same.
result = Interop.Sys.MkDir(name, (int)Interop.Sys.Permissions.Mask);
if (result < 0 && firstError.Error == 0)
{
Interop.ErrorInfo errorInfo = Interop.Sys.GetLastErrorInfo();
// 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 (errorInfo.Error != Interop.Error.EEXIST)
{
firstError = errorInfo;
}
else if (FileExists(name) || (!DirectoryExists(name, out errorInfo) && errorInfo.Error == Interop.Error.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 = errorInfo;
errorString = name;
}
}
}
// Only throw an exception if creating the exact directory we wanted failed to work correctly.
if (result < 0 && firstError.Error != 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 (PathInternal.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));
}