| static private Normalize ( string path, bool checkInvalidCharacters, bool expandShortPaths ) : string | ||
| path | string | Path to normalize |
| checkInvalidCharacters | bool | True to check for invalid characters |
| expandShortPaths | bool | Attempt to expand short paths if true |
| Результат | string | |
// Returns a unique temporary file name, and creates a 0-byte file by that
// name on disk.
public static string GetTempFileName()
{
var tempPathBuilder = new ValueStringBuilder(stackalloc char[PathInternal.MaxShortPath]);
GetTempPath(ref tempPathBuilder);
var builder = new ValueStringBuilder(stackalloc char[PathInternal.MaxShortPath]);
uint result = Interop.Kernel32.GetTempFileNameW(
ref tempPathBuilder.GetPinnableReference(), "tmp", 0, ref builder.GetPinnableReference());
tempPathBuilder.Dispose();
if (result == 0)
{
throw Win32Marshal.GetExceptionForLastWin32Error();
}
builder.Length = builder.RawChars.IndexOf('\0');
string path = PathHelper.Normalize(ref builder);
builder.Dispose();
return(path);
}
// Expands the given path to a fully qualified path.
public static string GetFullPath(string path)
{
if (path == null)
{
throw new ArgumentNullException(nameof(path));
}
// If the path would normalize to string empty, we'll consider it empty
if (PathInternal.IsEffectivelyEmpty(path))
{
throw new ArgumentException(SR.Arg_PathEmpty, nameof(path));
}
// Embedded null characters are the only invalid character case we trully care about.
// This is because the nulls will signal the end of the string to Win32 and therefore have
// unpredictable results.
if (path.IndexOf('\0') != -1)
{
throw new ArgumentException(SR.Argument_InvalidPathChars, nameof(path));
}
if (PathInternal.IsExtended(path))
{
// \\?\ paths are considered normalized by definition. Windows doesn't normalize \\?\
// paths and neither should we. Even if we wanted to GetFullPathName does not work
// properly with device paths. If one wants to pass a \\?\ path through normalization
// one can chop off the prefix, pass it to GetFullPath and add it again.
return(path);
}
return(PathHelper.Normalize(path));
}
// Returns a unique temporary file name, and creates a 0-byte file by that
// name on disk.
public static string GetTempFileName()
{
Span <char> initialTempPathBuffer = stackalloc char[PathInternal.MaxShortPath];
ValueStringBuilder tempPathBuilder = new ValueStringBuilder(initialTempPathBuffer);
GetTempPath(ref tempPathBuilder);
Span <char> initialBuffer = stackalloc char[PathInternal.MaxShortPath];
var builder = new ValueStringBuilder(initialBuffer);
uint result = 0;
while ((result = Interop.Kernel32.GetTempFileNameW(
ref tempPathBuilder.GetPinnableReference(), "tmp", 0, ref builder.GetPinnableReference())) > builder.Capacity)
{
// Reported size is greater than the buffer size. Increase the capacity.
builder.EnsureCapacity(checked ((int)result));
}
tempPathBuilder.Dispose();
if (result == 0)
{
throw Win32Marshal.GetExceptionForLastWin32Error();
}
builder.Length = (int)result;
string path = PathHelper.Normalize(ref builder);
builder.Dispose();
return(path);
}
private static unsafe string CreateTempSubdirectoryCore(string?prefix)
{
ValueStringBuilder builder = new ValueStringBuilder(stackalloc char[PathInternal.MaxShortPath]);
Path.GetTempPath(ref builder);
// ensure the base TEMP directory exists
CreateDirectory(PathHelper.Normalize(ref builder));
builder.Append(prefix);
const int RandomFileNameLength = 12; // 12 == 8 + 1 (for period) + 3
int initialTempPathLength = builder.Length;
builder.EnsureCapacity(initialTempPathLength + RandomFileNameLength);
// For generating random file names
// 8 random bytes provides 12 chars in our encoding for the 8.3 name.
const int RandomKeyLength = 8;
byte * pKey = stackalloc byte[RandomKeyLength];
// to avoid an infinite loop, only try as many as GetTempFileNameW will create
const int MaxAttempts = ushort.MaxValue;
int attempts = 0;
while (attempts < MaxAttempts)
{
// simulate a call to Path.GetRandomFileName() without allocating an intermediate string
Interop.GetRandomBytes(pKey, RandomKeyLength);
Path.Populate83FileNameFromRandomBytes(pKey, RandomKeyLength, builder.RawChars.Slice(builder.Length, RandomFileNameLength));
builder.Length += RandomFileNameLength;
string path = PathHelper.Normalize(ref builder);
bool directoryCreated = Interop.Kernel32.CreateDirectory(path, null);
if (!directoryCreated)
{
// in the off-chance that the directory already exists, try again
int error = Marshal.GetLastPInvokeError();
if (error == Interop.Errors.ERROR_ALREADY_EXISTS)
{
builder.Length = initialTempPathLength;
attempts++;
continue;
}
throw Win32Marshal.GetExceptionForWin32Error(error, path);
}
builder.Dispose();
return(path);
}
throw new IOException(SR.IO_MaxAttemptsReached);
}
public static string GetTempPath()
{
var builder = new ValueStringBuilder(stackalloc char[PathInternal.MaxShortPath]);
GetTempPath(ref builder);
string path = PathHelper.Normalize(ref builder);
builder.Dispose();
return(path);
}
private static string NormalizePath(string path, bool fullCheck = true, bool expandShortPaths = true)
{
Debug.Assert(path != null, "path can't be null");
bool isExtended = PathInternal.IsExtended(path);
if (fullCheck)
{
// Embedded null characters are the only invalid character case we want to check up front.
// This is because the nulls will signal the end of the string to Win32 and therefore have
// unpredictable results. Other invalid characters we give a chance to be normalized out.
if (path.IndexOf('\0') != -1)
{
throw new ArgumentException(SR.Argument_InvalidPathChars, "path");
}
// Toss out paths with colons that aren't a valid drive specifier.
// Cannot start with a colon and can only be of the form "C:" or "\\?\C:".
// (Note that we used to explicitly check "http:" and "file:"- these are caught by this check now.)
int startIndex = PathInternal.PathStartSkip(path) + 2;
if (isExtended)
{
startIndex += PathInternal.ExtendedPathPrefix.Length;
}
if ((path.Length > 0 && path[0] == VolumeSeparatorChar) ||
(path.Length >= startIndex && path[startIndex - 1] == VolumeSeparatorChar && !PathInternal.IsValidDriveChar(path[startIndex - 2])) ||
(path.Length > startIndex && path.IndexOf(VolumeSeparatorChar, startIndex) != -1))
{
throw new NotSupportedException(SR.Argument_PathFormatNotSupported);
}
}
if (isExtended)
{
return(NormalizeExtendedPath(path, fullCheck));
}
else
{
// Technically this doesn't matter but we used to throw for this case
if (String.IsNullOrWhiteSpace(path))
{
throw new ArgumentException(SR.Arg_PathIllegal);
}
return(PathHelper.Normalize(path, fullCheck, expandShortPaths));
}
}
// Gets the full path without argument validation
private static string GetFullPathInternal(string path)
{
Debug.Assert(!string.IsNullOrEmpty(path));
Debug.Assert(!path.Contains('\0'));
if (PathInternal.IsExtended(path.AsSpan()))
{
// \\?\ paths are considered normalized by definition. Windows doesn't normalize \\?\
// paths and neither should we. Even if we wanted to GetFullPathName does not work
// properly with device paths. If one wants to pass a \\?\ path through normalization
// one can chop off the prefix, pass it to GetFullPath and add it again.
return(path);
}
return(PathHelper.Normalize(path));
}
private static string NormalizeStandardPath(string path, bool fullCheck, bool expandShortPaths)
{
// Technically this doesn't matter, but we used to throw for this case
if (String.IsNullOrWhiteSpace(path))
{
throw new ArgumentException(SR.Arg_PathIllegal);
}
PathHelper helper = new PathHelper();
string returnVal = helper.Normalize(path, fullCheck, expandShortPaths);
if (String.Equals(returnVal, path, StringComparison.Ordinal))
{
returnVal = path;
}
return(returnVal);
}
// Expands the given path to a fully qualified path.
public static string GetFullPath(string path)
{
if (path == null)
{
throw new ArgumentNullException(nameof(path));
}
// Embedded null characters are the only invalid character case we want to check up front.
// This is because the nulls will signal the end of the string to Win32 and therefore have
// unpredictable results. Other invalid characters we give a chance to be normalized out.
if (path.IndexOf('\0') != -1)
{
throw new ArgumentException(SR.Argument_InvalidPathChars, nameof(path));
}
if (PathInternal.IsExtended(path))
{
// We can't really know what is valid for all cases of extended paths.
//
// - object names can include other characters as well (':', '/', etc.)
// - even file objects have different rules (pipe names can contain most characters)
//
// As such we will do no further analysis of extended paths to avoid blocking known and unknown
// scenarios as well as minimizing compat breaks should we block now and need to unblock later.
return(path);
}
bool isDevice = PathInternal.IsDevice(path);
if (!isDevice)
{
// Toss out paths with colons that aren't a valid drive specifier.
// Cannot start with a colon and can only be of the form "C:".
// (Note that we used to explicitly check "http:" and "file:"- these are caught by this check now.)
int startIndex = PathInternal.PathStartSkip(path);
// Move past the colon
startIndex += 2;
if ((path.Length > 0 && path[0] == PathInternal.VolumeSeparatorChar) ||
(path.Length >= startIndex && path[startIndex - 1] == PathInternal.VolumeSeparatorChar && !PathInternal.IsValidDriveChar(path[startIndex - 2])) ||
(path.Length > startIndex && path.IndexOf(PathInternal.VolumeSeparatorChar, startIndex) != -1))
{
throw new NotSupportedException(SR.Format(SR.Argument_PathFormatNotSupported_Path, path));
}
}
// Technically this doesn't matter but we used to throw for this case
if (PathInternal.IsEffectivelyEmpty(path))
{
throw new ArgumentException(SR.Arg_PathEmpty, nameof(path));
}
// We don't want to check invalid characters for device format- see comments for extended above
string fullPath = PathHelper.Normalize(path, checkInvalidCharacters: !isDevice, expandShortPaths: true);
if (!isDevice)
{
// Emulate FileIOPermissions checks, retained for compatibility (normal invalid characters have already been checked)
if (PathInternal.HasWildCardCharacters(fullPath))
{
throw new ArgumentException(SR.Argument_InvalidPathChars, nameof(path));
}
}
return(fullPath);
}
private static string NormalizeStandardPath(string path, bool fullCheck, bool expandShortPaths)
{
// Technically this doesn't matter, but we used to throw for this case
if (String.IsNullOrWhiteSpace(path))
throw new ArgumentException(SR.Arg_PathIllegal);
PathHelper helper = new PathHelper();
string returnVal = helper.Normalize(path, fullCheck, expandShortPaths);
if (String.Equals(returnVal, path, StringComparison.Ordinal))
{
returnVal = path;
}
return returnVal;
}
/// <summary>
/// Normalize the path and check for bad characters or other invalid syntax.
/// </summary>
/// <remarks>
/// The legacy NormalizePath
/// </remarks>
private static string NormalizeAndValidatePath(string path)
{
Debug.Assert(path != null, "path can't be null");
// Embedded null characters are the only invalid character case we want to check up front.
// This is because the nulls will signal the end of the string to Win32 and therefore have
// unpredictable results. Other invalid characters we give a chance to be normalized out.
if (path.IndexOf('\0') != -1)
{
throw new ArgumentException(SR.Argument_InvalidPathChars, "path");
}
// Toss out paths with colons that aren't a valid drive specifier.
// Cannot start with a colon and can only be of the form "C:" or "\\?\C:".
// (Note that we used to explicitly check "http:" and "file:"- these are caught by this check now.)
int startIndex = PathInternal.PathStartSkip(path);
bool isExtended = path.Length >= PathInternal.ExtendedPathPrefix.Length + startIndex &&
path.IndexOf(PathInternal.ExtendedPathPrefix, startIndex, PathInternal.ExtendedPathPrefix.Length, StringComparison.Ordinal) >= 0;
if (isExtended)
{
startIndex += PathInternal.ExtendedPathPrefix.Length;
}
// Move past the colon
startIndex += 2;
if ((path.Length > 0 && path[0] == VolumeSeparatorChar) ||
(path.Length >= startIndex && path[startIndex - 1] == VolumeSeparatorChar && !PathInternal.IsValidDriveChar(path[startIndex - 2])) ||
(path.Length > startIndex && path.IndexOf(VolumeSeparatorChar, startIndex) != -1))
{
throw new NotSupportedException(SR.Argument_PathFormatNotSupported);
}
if (isExtended)
{
// If the path is in extended syntax, we don't need to normalize, but we still do some basic validity checks
if (!ValidateExtendedPath(path))
{
throw new ArgumentException(SR.Arg_PathIllegal);
}
// \\?\GLOBALROOT gives access to devices out of the scope of the current user, we
// don't want to allow this for security reasons.
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247.aspx#nt_namespaces
if (path.StartsWith(@"\\?\globalroot", StringComparison.OrdinalIgnoreCase))
{
throw new ArgumentException(SR.Arg_PathGlobalRoot);
}
// Look for illegal path characters.
PathInternal.CheckInvalidPathChars(path);
return(path);
}
else
{
// Technically this doesn't matter but we used to throw for this case
if (String.IsNullOrWhiteSpace(path))
{
throw new ArgumentException(SR.Arg_PathIllegal);
}
return(PathHelper.Normalize(path, checkInvalidCharacters: true, expandShortPaths: true));
}
}