public static Exception GetLastWin32ErrorException(IAbsoluteDirectoryPath.Impl path)
{
int error = Marshal.GetLastWin32Error();
Debug.Assert(error != 0, "no error");
var win32Ex = new Win32Exception(error);
string message = $"{win32Ex.Message} Path: '{path.PathDisplay}'.";
switch (error)
{
case WindowsNative.Errors.FILE_NOT_FOUND:
case WindowsNative.Errors.PATH_NOT_FOUND:
case WindowsNative.Errors.INVALID_DRIVE:
return(new DirectoryNotFoundException(message, win32Ex));
case WindowsNative.Errors.ACCESS_DENIED:
return(new UnauthorizedIOAccessException(message, win32Ex));
case WindowsNative.Errors.FILENAME_EXCED_RANGE:
return(new PathTooLongException(message, win32Ex));
default:
if (path.PathFormat == PathFormat.Windows)
{
path.EnsureExists(); // Throw DirectoryNotFound exception instead of IOException if path is a file.
}
return(new IOException(message, win32Ex));
}
}
public static void GetSpace(IAbsoluteDirectoryPath.Impl path, out long availableBytes, out long totalBytes, out long freeBytes)
{
using (MediaInsertionPromptGuard.Enter()) {
if (!WindowsNative.GetDiskFreeSpaceEx(path.PathExport, out availableBytes, out totalBytes, out freeBytes))
{
throw GetLastWin32ErrorException(path);
}
}
}
public static unsafe string GetFileSystem(IAbsoluteDirectoryPath.Impl rootDir)
{
// rootDir must be a symlink or root drive
const int MAX_LENGTH = 261; // MAX_PATH + 1
char *fileSystemName = stackalloc char[MAX_LENGTH];
using (MediaInsertionPromptGuard.Enter()) {
if (!WindowsNative.GetVolumeInformation(rootDir.PathExportWithTrailingSeparator, null, 0, null, null, out int fileSystemFlags, fileSystemName, MAX_LENGTH))
{
throw GetLastWin32ErrorException(rootDir);
}
}
return(new string(fileSystemName));
}
public static DriveType GetDriveType(IAbsoluteDirectoryPath.Impl path) => WindowsNative.GetDriveType(path.PathExportWithTrailingSeparator);