public static bool IsDirectoryCaseSensitive(string directory, bool throwOnError = true)
{
IntPtr hFile = CreateFile(directory, 0, 0,
IntPtr.Zero, FileMode.Open,
FILE_FLAG_BACKUP_SEMANTICS, IntPtr.Zero);
if (hFile == INVALID_HANDLE)
{
throw new Win32Exception();
}
try {
IO_STATUS_BLOCK iosb = new IO_STATUS_BLOCK();
FILE_CASE_SENSITIVE_INFORMATION caseSensitive = new FILE_CASE_SENSITIVE_INFORMATION();
uint status = NtQueryInformationFile(hFile, ref iosb, ref caseSensitive,
Marshal.SizeOf <FILE_CASE_SENSITIVE_INFORMATION>(),
FILE_INFORMATION_CLASS.FileCaseSensitiveInformation);
if (status == STATUS_NOT_SUPPORTED)
{
// Not supported, must be older version of windows.
// Directory case sensitivity is impossible.
// Not tested, but this is most likely what
// should be returned in this situation.
return(false);
}
else if (status != STATUS_SUCCESS)
{
throw new Exception($"Unknown NTSTATUS: {status:X8}!");
}
return(caseSensitive.Flags.HasFlag(CASE_SENSITIVITY_FLAGS.CaseSensitiveDirectory));
}
finally {
CloseHandle(hFile);
}
}
public static bool IsDirectoryCaseSensitivitySupported()
{
if (isSupported.HasValue)
{
return(isSupported.Value);
}
// Make sure the directory exists
if (!Directory.Exists(TempDirectory))
{
Directory.CreateDirectory(TempDirectory);
}
IntPtr hFile = CreateFile(TempDirectory, 0, FileShare.ReadWrite,
IntPtr.Zero, FileMode.Open,
FILE_FLAG_BACKUP_SEMANTICS, IntPtr.Zero);
if (hFile == INVALID_HANDLE)
{
throw new Exception("Failed to open file while checking case sensitivity support!");
}
try {
IO_STATUS_BLOCK iosb = new IO_STATUS_BLOCK();
FILE_CASE_SENSITIVE_INFORMATION caseSensitive = new FILE_CASE_SENSITIVE_INFORMATION();
// Strangely enough, this doesn't fail on files
NTSTATUS result = NtQueryInformationFile(hFile, ref iosb, ref caseSensitive,
Marshal.SizeOf <FILE_CASE_SENSITIVE_INFORMATION>(),
FILE_INFORMATION_CLASS.FileCaseSensitiveInformation);
switch (result)
{
case NTSTATUS.SUCCESS:
return((isSupported = true).Value);
case NTSTATUS.NOT_IMPLEMENTED:
case NTSTATUS.INVALID_INFO_CLASS:
case NTSTATUS.INVALID_PARAMETER:
case NTSTATUS.NOT_SUPPORTED:
// Not supported, must be older version of windows.
// Directory case sensitivity is impossible.
return((isSupported = false).Value);
default:
throw new Exception($"Unknown NTSTATUS {result:X8} while checking case sensitivity support!");
}
}
finally {
CloseHandle(hFile);
try {
// CHOOSE: If you delete the folder, future calls to this will not be any faster
// Directory.Delete(TempDirectory);
}
catch { }
}
}
// Require's elevated priviledges
public static void SetDirectoryCaseSensitive(string directory, bool enable)
{
// FILE_WRITE_ATTRIBUTES access is the only requirement
IntPtr hFile = CreateFile(directory, FILE_WRITE_ATTRIBUTES, FileShare.ReadWrite,
IntPtr.Zero, FileMode.Open,
FILE_FLAG_BACKUP_SEMANTICS, IntPtr.Zero);
if (hFile == INVALID_HANDLE)
{
throw new Win32Exception();
}
try {
IO_STATUS_BLOCK iosb = new IO_STATUS_BLOCK();
FILE_CASE_SENSITIVE_INFORMATION caseSensitive = new FILE_CASE_SENSITIVE_INFORMATION();
if (enable)
{
caseSensitive.Flags |= CASE_SENSITIVITY_FLAGS.CaseSensitiveDirectory;
}
NTSTATUS status = NtSetInformationFile(hFile, ref iosb, ref caseSensitive,
Marshal.SizeOf <FILE_CASE_SENSITIVE_INFORMATION>(),
FILE_INFORMATION_CLASS.FileCaseSensitiveInformation);
switch (status)
{
case NTSTATUS.SUCCESS:
return;
case NTSTATUS.DIRECTORY_NOT_EMPTY:
throw new IOException($"Directory \"{directory}\" is not empty! " +
$"Cannot set case sensitivity!");
case NTSTATUS.NOT_IMPLEMENTED:
case NTSTATUS.NOT_SUPPORTED:
case NTSTATUS.INVALID_INFO_CLASS:
case NTSTATUS.INVALID_PARAMETER:
// Not supported, must be older version of windows.
// Directory case sensitivity is impossible.
throw new NotSupportedException("This version of Windows does not support directory case sensitivity!");
default:
throw new Exception($"Unknown NTSTATUS: {(uint)status:X8}!");
}
}
finally {
CloseHandle(hFile);
}
}
public static bool IsDirectoryCaseSensitive(string directory, bool throwOnError = true)
{
// Read access is NOT required
IntPtr hFile = CreateFile(directory, 0, FileShare.ReadWrite,
IntPtr.Zero, FileMode.Open,
FILE_FLAG_BACKUP_SEMANTICS, IntPtr.Zero);
if (hFile == INVALID_HANDLE)
{
throw new Win32Exception();
}
try {
IO_STATUS_BLOCK iosb = new IO_STATUS_BLOCK();
FILE_CASE_SENSITIVE_INFORMATION caseSensitive = new FILE_CASE_SENSITIVE_INFORMATION();
NTSTATUS status = NtQueryInformationFile(hFile, ref iosb, ref caseSensitive,
Marshal.SizeOf <FILE_CASE_SENSITIVE_INFORMATION>(),
FILE_INFORMATION_CLASS.FileCaseSensitiveInformation);
switch (status)
{
case NTSTATUS.SUCCESS:
return(caseSensitive.Flags.HasFlag(CASE_SENSITIVITY_FLAGS.CaseSensitiveDirectory));
case NTSTATUS.NOT_IMPLEMENTED:
case NTSTATUS.NOT_SUPPORTED:
case NTSTATUS.INVALID_INFO_CLASS:
case NTSTATUS.INVALID_PARAMETER:
// Not supported, must be older version of windows.
// Directory case sensitivity is impossible.
return(false);
case NTSTATUS.ACCESS_DENIED:
throw new UnauthorizedAccessException();
default:
throw new Exception($"Unknown NTSTATUS: {status:X8}!");
}
}
finally {
CloseHandle(hFile);
}
}
public static extern NTSTATUS NtSetInformationFile(
IntPtr FileHandle,
ref IO_STATUS_BLOCK IoStatusBlock,
ref FILE_CASE_SENSITIVE_INFORMATION FileInformation,
int Length,
FILE_INFORMATION_CLASS FileInformationClass);
