public static Exception TranslateWinRTException(this Exception exception, string filePath, bool isDirectory = false)
{
int errorCode = Win32Marshal.TryMakeWin32ErrorCodeFromHR(exception.HResult);
if (isDirectory)
{
// WinRT remaps all ERROR_PATH_NOT_FOUND to ERROR_FILE_NOT_FOUND
if (errorCode == Interop.ERROR_FILE_NOT_FOUND)
{
errorCode = Interop.ERROR_PATH_NOT_FOUND;
}
}
else
{
// Existing comment from FileStream:
// NT5 oddity - when trying to open "C:\" as a FileStream,
// we usually get ERROR_PATH_NOT_FOUND from the OS. We should
// probably be consistent w/ every other directory.
// This remaps the error for non-existent drives which is incorrect
// but we need to preserve it for compatibility
if (errorCode == Interop.ERROR_PATH_NOT_FOUND && filePath.Equals(Directory.InternalGetDirectoryRoot(filePath)))
{
errorCode = Interop.ERROR_ACCESS_DENIED;
}
// Known issue: WinRT pre-check's the find data of a fullPath before trying to create it, if the type doesn't match
// (IE: open file on a directory) it will return E_INVALIDARG instead of ERROR_ACCESS_DENIED
// CreateFile returns ERROR_PATH_NOT_FOUND when given a fullPath that ends in a backslash.
// WinRT remaps all ERROR_PATH_NOT_FOUND to ERROR_FILE_NOT_FOUND
if (errorCode == Interop.ERROR_FILE_NOT_FOUND && filePath.Length > 0 && filePath[filePath.Length - 1] == Path.DirectorySeparatorChar)
{
errorCode = Interop.ERROR_PATH_NOT_FOUND;
}
}
// Known issue: We still can't handle ERROR_SHARING_VIOLATION because WinRT APIs are mapping this to ERROR_ACCESS_DENIED
// Maps all unknown exceptions to IOException to be consistent with Win32 behavior
return(Win32Marshal.GetExceptionForWin32Error(errorCode, filePath));
}
public override void CreateDirectory(string fullPath)
{
if (PathInternal.IsDirectoryTooLong(fullPath))
{
throw new PathTooLongException(SR.IO_PathTooLong);
}
// 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;
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 = 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.mincore.SECURITY_ATTRIBUTES secAttrs = default(Interop.mincore.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);
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.mincore.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 (File.InternalExists(name) || (!DirectoryExists(name, out currentError) && currentError == Interop.mincore.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.mincore.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);
}
}
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);
}
Interop.ErrorInfo errorInfo = default(Interop.ErrorInfo);
while ((result = Interop.libc.mkdir(name, (int)Interop.libc.Permissions.S_IRWXU)) < 0 && (errorInfo = Interop.Sys.GetLastErrorInfo()).Error == Interop.Error.EINTR)
{
;
}
if (result < 0 && firstError.Error == 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 (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);
}
}
