private const String NameField = "_name"; // For serialization
public DriveInfo(String driveName)
{
if (driveName == null)
{
throw new ArgumentNullException("driveName");
}
if (driveName.Length == 1)
{
_name = driveName + ":\\";
}
else
{
// GetPathRoot does not check all invalid characters
Path.CheckInvalidPathChars(driveName);
_name = Path.GetPathRoot(driveName);
// Disallow null or empty drive letters and UNC paths
if (_name == null || _name.Length == 0 || _name.StartsWith("\\\\", StringComparison.Ordinal))
{
throw new ArgumentException(Environment.GetResourceString("Arg_MustBeDriveLetterOrRootDir"));
}
}
if (_name.Length == 2 && _name[1] == ':')
{
_name = _name + "\\";
}
// Now verify that the drive letter could be a real drive name.
// On Windows this means it's between A and Z, ignoring case.
// On a Unix platform, perhaps this should be a device name with
// a partition like /dev/hdc0, or possibly a mount point.
char letter = driveName[0];
if (!((letter >= 'A' && letter <= 'Z') || (letter >= 'a' && letter <= 'z')))
{
throw new ArgumentException(Environment.GetResourceString("Arg_MustBeDriveLetterOrRootDir"));
}
// Now do a security check.
String demandPath = _name + '.';
new FileIOPermission(FileIOPermissionAccess.PathDiscovery, demandPath).Demand();
}
public static bool HasExtension(string path)
{
if (path != null)
{
Path.CheckInvalidPathChars(path, false);
int length = path.Length;
while (--length >= 0)
{
char ch = path[length];
if ((int)ch == 46)
{
return(length != path.Length - 1);
}
if ((int)ch == (int)Path.DirectorySeparatorChar || (int)ch == (int)Path.AltDirectorySeparatorChar || (int)ch == (int)Path.VolumeSeparatorChar)
{
break;
}
}
}
return(false);
}
public static string GetDirectoryName(string path)
{
if (path != null)
{
Path.CheckInvalidPathChars(path);
path = Path.NormalizePath(path, false);
int rootLength = Path.GetRootLength(path);
if (path.Length > rootLength)
{
int length = path.Length;
if (length == rootLength)
{
return((string)null);
}
do
{
;
}while (length > rootLength && (int)path[--length] != (int)Path.DirectorySeparatorChar && (int)path[length] != (int)Path.AltDirectorySeparatorChar);
return(path.Substring(0, length));
}
}
return((string)null);
}
internal static unsafe string NormalizePath(string path, bool fullCheck, int maxPathLength, bool expandShortPaths)
{
if (fullCheck)
{
path = path.TrimEnd(Path.TrimEndChars);
Path.CheckInvalidPathChars(path, false);
}
int index1 = 0;
PathHelper pathHelper;
if (path.Length + 1 <= Path.MaxPath)
{
char *charArrayPtr = stackalloc char[Path.MaxPath];
pathHelper = new PathHelper(charArrayPtr, Path.MaxPath);
}
else
{
pathHelper = new PathHelper(path.Length + Path.MaxPath, maxPathLength);
}
uint num1 = 0;
uint num2 = 0;
bool flag1 = false;
uint num3 = 0;
int num4 = -1;
bool flag2 = false;
bool flag3 = true;
int num5 = 0;
bool flag4 = false;
if (path.Length > 0 && ((int)path[0] == (int)Path.DirectorySeparatorChar || (int)path[0] == (int)Path.AltDirectorySeparatorChar))
{
pathHelper.Append('\\');
++index1;
num4 = 0;
}
for (; index1 < path.Length; ++index1)
{
char ch1 = path[index1];
if ((int)ch1 == (int)Path.DirectorySeparatorChar || (int)ch1 == (int)Path.AltDirectorySeparatorChar)
{
if ((int)num3 == 0)
{
if (num2 > 0U)
{
int index2 = num4 + 1;
if ((int)path[index2] != 46)
{
throw new ArgumentException(Environment.GetResourceString("Arg_PathIllegal"));
}
if (num2 >= 2U)
{
if (flag2 && num2 > 2U)
{
throw new ArgumentException(Environment.GetResourceString("Arg_PathIllegal"));
}
if ((int)path[index2 + 1] == 46)
{
for (int index3 = index2 + 2; (long)index3 < (long)index2 + (long)num2; ++index3)
{
if ((int)path[index3] != 46)
{
throw new ArgumentException(Environment.GetResourceString("Arg_PathIllegal"));
}
}
num2 = 2U;
}
else
{
if (num2 > 1U)
{
throw new ArgumentException(Environment.GetResourceString("Arg_PathIllegal"));
}
num2 = 1U;
}
}
if ((int)num2 == 2)
{
pathHelper.Append('.');
}
pathHelper.Append('.');
flag1 = false;
}
if (num1 > 0U & flag3 && index1 + 1 < path.Length && ((int)path[index1 + 1] == (int)Path.DirectorySeparatorChar || (int)path[index1 + 1] == (int)Path.AltDirectorySeparatorChar))
{
pathHelper.Append(Path.DirectorySeparatorChar);
}
}
num2 = 0U;
num1 = 0U;
if (!flag1)
{
flag1 = true;
pathHelper.Append(Path.DirectorySeparatorChar);
}
num3 = 0U;
num4 = index1;
flag2 = false;
flag3 = false;
if (flag4)
{
pathHelper.TryExpandShortFileName();
flag4 = false;
}
int num6 = pathHelper.Length - 1;
int num7 = num5;
if (num6 - num7 > Path.MaxDirectoryLength)
{
throw new PathTooLongException(Environment.GetResourceString("IO.PathTooLong"));
}
num5 = num6;
}
else if ((int)ch1 == 46)
{
++num2;
}
else if ((int)ch1 == 32)
{
++num1;
}
else
{
if ((int)ch1 == 126 & expandShortPaths)
{
flag4 = true;
}
flag1 = false;
if (flag3 && (int)ch1 == (int)Path.VolumeSeparatorChar)
{
char ch2 = index1 > 0 ? path[index1 - 1] : ' ';
if (((int)num2 != 0 || num3 < 1U ? 0 : ((int)ch2 != 32 ? 1 : 0)) == 0)
{
throw new ArgumentException(Environment.GetResourceString("Arg_PathIllegal"));
}
flag2 = true;
if (num3 > 1U)
{
int index2 = 0;
while (index2 < pathHelper.Length && (int)pathHelper[index2] == 32)
{
++index2;
}
if ((long)num3 - (long)index2 == 1L)
{
pathHelper.Length = 0;
pathHelper.Append(ch2);
}
}
num3 = 0U;
}
else
{
num3 += 1U + num2 + num1;
}
if (num2 > 0U || num1 > 0U)
{
int num6 = num4 >= 0 ? index1 - num4 - 1 : index1;
if (num6 > 0)
{
for (int index2 = 0; index2 < num6; ++index2)
{
pathHelper.Append(path[num4 + 1 + index2]);
}
}
num2 = 0U;
num1 = 0U;
}
pathHelper.Append(ch1);
num4 = index1;
}
}
if (pathHelper.Length - 1 - num5 > Path.MaxDirectoryLength)
{
throw new PathTooLongException(Environment.GetResourceString("IO.PathTooLong"));
}
if ((int)num3 == 0 && num2 > 0U)
{
int index2 = num4 + 1;
if ((int)path[index2] != 46)
{
throw new ArgumentException(Environment.GetResourceString("Arg_PathIllegal"));
}
if (num2 >= 2U)
{
if (flag2 && num2 > 2U)
{
throw new ArgumentException(Environment.GetResourceString("Arg_PathIllegal"));
}
if ((int)path[index2 + 1] == 46)
{
for (int index3 = index2 + 2; (long)index3 < (long)index2 + (long)num2; ++index3)
{
if ((int)path[index3] != 46)
{
throw new ArgumentException(Environment.GetResourceString("Arg_PathIllegal"));
}
}
num2 = 2U;
}
else
{
if (num2 > 1U)
{
throw new ArgumentException(Environment.GetResourceString("Arg_PathIllegal"));
}
num2 = 1U;
}
}
if ((int)num2 == 2)
{
pathHelper.Append('.');
}
pathHelper.Append('.');
}
if (pathHelper.Length == 0)
{
throw new ArgumentException(Environment.GetResourceString("Arg_PathIllegal"));
}
if (fullCheck && (pathHelper.OrdinalStartsWith("http:", false) || pathHelper.OrdinalStartsWith("file:", false)))
{
throw new ArgumentException(Environment.GetResourceString("Argument_PathUriFormatNotSupported"));
}
if (flag4)
{
pathHelper.TryExpandShortFileName();
}
int num8 = 1;
if (fullCheck)
{
num8 = pathHelper.GetFullPathName();
bool flag5 = false;
for (int index2 = 0; index2 < pathHelper.Length && !flag5; ++index2)
{
if ((int)pathHelper[index2] == 126 & expandShortPaths)
{
flag5 = true;
}
}
if (flag5 && !pathHelper.TryExpandShortFileName())
{
int lastSlash = -1;
for (int index2 = pathHelper.Length - 1; index2 >= 0; --index2)
{
if ((int)pathHelper[index2] == (int)Path.DirectorySeparatorChar)
{
lastSlash = index2;
break;
}
}
if (lastSlash >= 0)
{
if (pathHelper.Length >= maxPathLength)
{
throw new PathTooLongException(Environment.GetResourceString("IO.PathTooLong"));
}
int lenSavedName = pathHelper.Length - lastSlash - 1;
pathHelper.Fixup(lenSavedName, lastSlash);
}
}
}
if (num8 != 0 && pathHelper.Length > 1 && ((int)pathHelper[0] == 92 && (int)pathHelper[1] == 92))
{
int index2;
for (index2 = 2; index2 < num8; ++index2)
{
if ((int)pathHelper[index2] == 92)
{
++index2;
break;
}
}
if (index2 == num8)
{
throw new ArgumentException(Environment.GetResourceString("Arg_PathIllegalUNC"));
}
if (pathHelper.OrdinalStartsWith("\\\\?\\globalroot", true))
{
throw new ArgumentException(Environment.GetResourceString("Arg_PathGlobalRoot"));
}
}
if (pathHelper.Length >= maxPathLength)
{
throw new PathTooLongException(Environment.GetResourceString("IO.PathTooLong"));
}
if (num8 == 0)
{
int errorCode = Marshal.GetLastWin32Error();
if (errorCode == 0)
{
errorCode = 161;
}
__Error.WinIOError(errorCode, path);
return((string)null);
}
string a = pathHelper.ToString();
if (string.Equals(a, path, StringComparison.Ordinal))
{
a = path;
}
return(a);
}
