/// <summary>
/// Returns the volume name for dos, UNC and device paths.
/// </summary>
internal static ReadOnlySpan <char> GetVolumeName(ReadOnlySpan <char> path)
{
// 3 cases: UNC ("\\server\share"), Device ("\\?\C:\"), or Dos ("C:\")
ReadOnlySpan <char> root = GetPathRoot(path);
if (root.Length == 0)
{
return(root);
}
// Cut from "\\?\UNC\Server\Share" to "Server\Share"
// Cut from "\\Server\Share" to "Server\Share"
int startOffset = GetUncRootLength(path);
if (startOffset == -1)
{
if (PathInternal.IsDevice(path))
{
startOffset = 4; // Cut from "\\?\C:\" to "C:"
}
else
{
startOffset = 0; // e.g. "C:"
}
}
ReadOnlySpan <char> pathToTrim = root.Slice(startOffset);
return(Path.EndsInDirectorySeparator(pathToTrim) ? pathToTrim.Slice(0, pathToTrim.Length - 1) : pathToTrim);
}
internal unsafe static bool HasWildCardCharacters(string path)
{
// Question mark is part of dos device syntax so we have to skip if we are
int startIndex = PathInternal.IsDevice(path) ? ExtendedPathPrefix.Length : 0;
return(path.IndexOfAny(s_wildcardChars, startIndex) >= 0);
}
/// <summary>
/// Returns the volume name for dos, UNC and device paths.
/// </summary>
internal static ReadOnlySpan <char> GetVolumeName(ReadOnlySpan <char> path)
{
// 3 cases: UNC ("\\server\share"), Device ("\\?\C:\"), or Dos ("C:\")
ReadOnlySpan <char> root = GetPathRoot(path);
if (root.Length == 0)
{
return(root);
}
int offset = GetUncRootLength(path);
if (offset >= 0)
{
// Cut from "\\?\UNC\Server\Share" to "Server\Share"
// Cut from "\\Server\Share" to "Server\Share"
return(TrimEndingDirectorySeparator(root.Slice(offset)));
}
else if (PathInternal.IsDevice(path))
{
return(TrimEndingDirectorySeparator(root.Slice(4))); // Cut from "\\?\C:\" to "C:"
}
return(TrimEndingDirectorySeparator(root)); // e.g. "C:"
}
internal static string EnsureExtendedPrefix(string path)
{
if (PathInternal.IsPartiallyQualified(path.AsSpan()) || PathInternal.IsDevice(path.AsSpan()))
{
return(path);
}
return(path.StartsWith("\\\\", StringComparison.OrdinalIgnoreCase) ? path.Insert(2, "?\\UNC\\") : "\\\\?\\" + path);
}
private static void VerifyPath(string path)
{
if (path != null)
{
path = path.Trim();
#if !PLATFORM_UNIX
if (!PathInternal.IsDevice(path) && PathInternal.HasInvalidVolumeSeparator(path))
{
throw new ArgumentException(Environment.GetResourceString("Argument_PathFormatNotSupported"));
}
#endif
PathInternal.CheckInvalidPathChars(path);
}
}
/// <summary>
/// Returns offset as -1 if the path is not in Unc format, otherwise returns the root length.
/// </summary>
/// <param name="path"></param>
/// <returns></returns>
internal static int GetUncRootLength(ReadOnlySpan <char> path)
{
bool isDevice = PathInternal.IsDevice(path);
if (!isDevice && StringSpanHelpers.Equals(path.Slice(0, 2), @"\\"))
{
return(2);
}
else if (isDevice && path.Length >= 8 &&
(StringSpanHelpers.Equals(path.Slice(0, 8), PathInternal.UncExtendedPathPrefix) ||
StringSpanHelpers.Equals(path.Slice(5, 4), @"UNC\")))
{
return(8);
}
return(-1);
}
/// <summary>
/// Returns offset as -1 if the path is not in Unc format, otherwise returns the root length.
/// </summary>
/// <param name="path"></param>
/// <returns></returns>
internal static int GetUncRootLength(ReadOnlySpan <char> path)
{
bool isDevice = PathInternal.IsDevice(path);
if (!isDevice && path.Slice(0, 2).EqualsOrdinal(@"\\"))
{
return(2);
}
else if (isDevice && path.Length >= 8 &&
(path.Slice(0, 8).EqualsOrdinal(PathInternal.UncExtendedPathPrefix) ||
path.Slice(5, 4).EqualsOrdinal(@"UNC\")))
{
return(8);
}
return(-1);
}
internal static int GetRootLength(ReadOnlySpan <char> path)
{
int length = path.Length;
int index = 0;
bool flag1 = PathInternal.IsDevice(path);
bool flag2 = flag1 && PathInternal.IsDeviceUNC(path);
if (!flag1 | flag2 && length > 0 && PathInternal.IsDirectorySeparator(path[0]))
{
if (flag2 || length > 1 && PathInternal.IsDirectorySeparator(path[1]))
{
index = flag2 ? 8 : 2;
int num = 2;
while (index < length && (!PathInternal.IsDirectorySeparator(path[index]) || --num > 0))
{
++index;
}
}
else
{
index = 1;
}
}
else if (flag1)
{
index = 4;
while (index < length && !PathInternal.IsDirectorySeparator(path[index]))
{
++index;
}
if (index < length && index > 4 && PathInternal.IsDirectorySeparator(path[index]))
{
++index;
}
}
else if (length >= 2 && path[1] == ':' && PathInternal.IsValidDriveChar(path[0]))
{
index = 2;
if (length > 2 && PathInternal.IsDirectorySeparator(path[2]))
{
++index;
}
}
return(index);
}
public static string GetFullPath(string path, string basePath)
{
if (path == null)
{
throw new ArgumentNullException(nameof(path));
}
if (basePath == null)
{
throw new ArgumentNullException(nameof(basePath));
}
if (!IsPathFullyQualified(basePath))
{
throw new ArgumentException(SR.Arg_BasePathNotFullyQualified, nameof(basePath));
}
if (basePath.Contains('\0') || path.Contains('\0'))
{
throw new ArgumentException(SR.Argument_InvalidPathChars);
}
if (IsPathFullyQualified(path))
{
return(GetFullPath(path));
}
int length = path.Length;
string combinedPath = null;
if ((length >= 1 && PathInternal.IsDirectorySeparator(path[0])))
{
// Path is current drive rooted i.e. starts with \:
// "\Foo" and "C:\Bar" => "C:\Foo"
// "\Foo" and "\\?\C:\Bar" => "\\?\C:\Foo"
combinedPath = Join(GetPathRoot(basePath.AsSpan()), path);
}
else if (length >= 2 && PathInternal.IsValidDriveChar(path[0]) && path[1] == PathInternal.VolumeSeparatorChar)
{
// Drive relative paths
Debug.Assert(length == 2 || !PathInternal.IsDirectorySeparator(path[2]));
if (StringSpanHelpers.Equals(GetVolumeName(path), GetVolumeName(basePath)))
{
// Matching root
// "C:Foo" and "C:\Bar" => "C:\Bar\Foo"
// "C:Foo" and "\\?\C:\Bar" => "\\?\C:\Bar\Foo"
combinedPath = Join(basePath, path.AsSpan().Slice(2));
}
else
{
// No matching root, root to specified drive
// "D:Foo" and "C:\Bar" => "D:Foo"
// "D:Foo" and "\\?\C:\Bar" => "\\?\D:\Foo"
combinedPath = !PathInternal.IsDevice(basePath)
? path.Insert(2, @"\")
: length == 2
? JoinInternal(basePath.AsSpan().Slice(0, 4), path, @"\")
: JoinInternal(basePath.AsSpan().Slice(0, 4), path.AsSpan().Slice(0, 2), @"\", path.AsSpan().Slice(2));
}
}
else
{
// "Simple" relative path
// "Foo" and "C:\Bar" => "C:\Bar\Foo"
// "Foo" and "\\?\C:\Bar" => "\\?\C:\Bar\Foo"
combinedPath = JoinInternal(basePath, path);
}
// Device paths are normalized by definition, so passing something of this format
// to GetFullPath() won't do anything by design. Additionally, GetFullPathName() in
// Windows doesn't root them properly. As such we need to manually remove segments.
return(PathInternal.IsDevice(combinedPath)
? RemoveRelativeSegments(combinedPath, PathInternal.GetRootLength(combinedPath))
: GetFullPath(combinedPath));
}
// 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);
}
/// <summary>
/// Normalize the given path.
/// </summary>
/// <remarks>
/// Normalizes via Win32 GetFullPathName(). It will also trim all "typical" whitespace at the end of the path (see s_trimEndChars). Will also trim initial
/// spaces if the path is determined to be rooted.
///
/// Note that invalid characters will be checked after the path is normalized, which could remove bad characters. (C:\|\..\a.txt -- C:\a.txt)
/// </remarks>
/// <param name="path">Path to normalize</param>
/// <param name="checkInvalidCharacters">True to check for invalid characters</param>
/// <param name="expandShortPaths">Attempt to expand short paths if true</param>
/// <exception cref="ArgumentException">Thrown if the path is an illegal UNC (does not contain a full server/share) or contains illegal characters.</exception>
/// <exception cref="PathTooLongException">Thrown if the path or a path segment exceeds the filesystem limits.</exception>
/// <exception cref="FileNotFoundException">Thrown if Windows returns ERROR_FILE_NOT_FOUND. (See Win32Marshal.GetExceptionForWin32Error)</exception>
/// <exception cref="DirectoryNotFoundException">Thrown if Windows returns ERROR_PATH_NOT_FOUND. (See Win32Marshal.GetExceptionForWin32Error)</exception>
/// <exception cref="UnauthorizedAccessException">Thrown if Windows returns ERROR_ACCESS_DENIED. (See Win32Marshal.GetExceptionForWin32Error)</exception>
/// <exception cref="IOException">Thrown if Windows returns an error that doesn't map to the above. (See Win32Marshal.GetExceptionForWin32Error)</exception>
/// <returns>Normalized path</returns>
internal static string Normalize(string path, bool checkInvalidCharacters, bool expandShortPaths)
{
// Get the full path
StringBuffer fullPath = new StringBuffer(PathInternal.MaxShortPath);
try
{
GetFullPathName(path, ref fullPath);
// Trim whitespace off the end of the string. Win32 normalization trims only U+0020.
fullPath.TrimEnd(PathInternal.s_trimEndChars);
if (fullPath.Length >= PathInternal.MaxLongPath)
{
// Fullpath is genuinely too long
throw new PathTooLongException(SR.IO_PathTooLong);
}
// Checking path validity used to happen before getting the full path name. To avoid additional input allocation
// (to trim trailing whitespace) we now do it after the Win32 call. This will allow legitimate paths through that
// used to get kicked back (notably segments with invalid characters might get removed via "..").
//
// There is no way that GetLongPath can invalidate the path so we'll do this (cheaper) check before we attempt to
// expand short file names.
// Scan the path for:
//
// - Illegal path characters.
// - Invalid UNC paths like \\, \\server, \\server\.
// - Segments that are too long (over MaxComponentLength)
// As the path could be > 30K, we'll combine the validity scan. None of these checks are performed by the Win32
// GetFullPathName() API.
bool possibleShortPath = false;
bool foundTilde = false;
// We can get UNCs as device paths through this code (e.g. \\.\UNC\), we won't validate them as there isn't
// an easy way to normalize without extensive cost (we'd have to hunt down the canonical name for any device
// path that contains UNC or to see if the path was doing something like \\.\GLOBALROOT\Device\Mup\,
// \\.\GLOBAL\UNC\, \\.\GLOBALROOT\GLOBAL??\UNC\, etc.
bool specialPath = fullPath.Length > 1 && fullPath[0] == '\\' && fullPath[1] == '\\';
bool isDevice = PathInternal.IsDevice(ref fullPath);
bool possibleBadUnc = specialPath && !isDevice;
int index = specialPath ? 2 : 0;
int lastSeparator = specialPath ? 1 : 0;
int segmentLength;
char current;
while (index < fullPath.Length)
{
current = fullPath[index];
// Try to skip deeper analysis. '?' and higher are valid/ignorable except for '\', '|', and '~'
if (current < '?' || current == '\\' || current == '|' || current == '~')
{
switch (current)
{
case '|':
case '>':
case '<':
case '\"':
if (checkInvalidCharacters)
{
throw new ArgumentException(SR.Argument_InvalidPathChars);
}
foundTilde = false;
break;
case '~':
foundTilde = true;
break;
case '\\':
segmentLength = index - lastSeparator - 1;
if (segmentLength > PathInternal.MaxComponentLength)
{
throw new PathTooLongException(SR.IO_PathTooLong + fullPath.ToString());
}
lastSeparator = index;
if (foundTilde)
{
if (segmentLength <= MaxShortName)
{
// Possibly a short path.
possibleShortPath = true;
}
foundTilde = false;
}
if (possibleBadUnc)
{
// If we're at the end of the path and this is the first separator, we're missing the share.
// Otherwise we're good, so ignore UNC tracking from here.
if (index == fullPath.Length - 1)
{
throw new ArgumentException(SR.Arg_PathIllegalUNC);
}
else
{
possibleBadUnc = false;
}
}
break;
default:
if (checkInvalidCharacters && current < ' ')
{
throw new ArgumentException(SR.Argument_InvalidPathChars, nameof(path));
}
break;
}
}
index++;
}
if (possibleBadUnc)
{
throw new ArgumentException(SR.Arg_PathIllegalUNC);
}
segmentLength = fullPath.Length - lastSeparator - 1;
if (segmentLength > PathInternal.MaxComponentLength)
{
throw new PathTooLongException(SR.IO_PathTooLong);
}
if (foundTilde && segmentLength <= MaxShortName)
{
possibleShortPath = true;
}
// Check for a short filename path and try and expand it. Technically you don't need to have a tilde for a short name, but
// this is how we've always done this. This expansion is costly so we'll continue to let other short paths slide.
if (expandShortPaths && possibleShortPath)
{
return(TryExpandShortFileName(ref fullPath, originalPath: path));
}
else
{
if (fullPath.Length == path.Length && fullPath.StartsWith(path))
{
// If we have the exact same string we were passed in, don't bother to allocate another string from the StringBuilder.
return(path);
}
else
{
return(fullPath.ToString());
}
}
}
finally
{
// Clear the buffer
fullPath.Free();
}
}
private static string TryExpandShortFileName(ref StringBuffer outputBuffer, string originalPath)
{
// We guarantee we'll expand short names for paths that only partially exist. As such, we need to find the part of the path that actually does exist. To
// avoid allocating like crazy we'll create only one input array and modify the contents with embedded nulls.
Debug.Assert(!PathInternal.IsPartiallyQualified(ref outputBuffer), "should have resolved by now");
// We'll have one of a few cases by now (the normalized path will have already:
//
// 1. Dos path (C:\)
// 2. Dos UNC (\\Server\Share)
// 3. Dos device path (\\.\C:\, \\?\C:\)
//
// We want to put the extended syntax on the front if it doesn't already have it, which may mean switching from \\.\.
//
// Note that we will never get \??\ here as GetFullPathName() does not recognize \??\ and will return it as C:\??\ (or whatever the current drive is).
int rootLength = PathInternal.GetRootLength(ref outputBuffer);
bool isDevice = PathInternal.IsDevice(ref outputBuffer);
StringBuffer inputBuffer = new StringBuffer(0);
try
{
bool isDosUnc = false;
int rootDifference = 0;
bool wasDotDevice = false;
// Add the extended prefix before expanding to allow growth over MAX_PATH
if (isDevice)
{
// We have one of the following (\\?\ or \\.\)
inputBuffer.Append(ref outputBuffer);
if (outputBuffer[2] == '.')
{
wasDotDevice = true;
inputBuffer[2] = '?';
}
}
else
{
isDosUnc = IsDosUnc(ref outputBuffer);
rootDifference = GetInputBuffer(ref outputBuffer, isDosUnc, ref inputBuffer);
}
rootLength += rootDifference;
int inputLength = inputBuffer.Length;
bool success = false;
int foundIndex = inputBuffer.Length - 1;
while (!success)
{
uint result = Interop.Kernel32.GetLongPathNameW(inputBuffer.UnderlyingArray, outputBuffer.UnderlyingArray, (uint)outputBuffer.Capacity);
// Replace any temporary null we added
if (inputBuffer[foundIndex] == '\0')
{
inputBuffer[foundIndex] = '\\';
}
if (result == 0)
{
// Look to see if we couldn't find the file
int error = Marshal.GetLastWin32Error();
if (error != Interop.Errors.ERROR_FILE_NOT_FOUND && error != Interop.Errors.ERROR_PATH_NOT_FOUND)
{
// Some other failure, give up
break;
}
// We couldn't find the path at the given index, start looking further back in the string.
foundIndex--;
for (; foundIndex > rootLength && inputBuffer[foundIndex] != '\\'; foundIndex--)
{
;
}
if (foundIndex == rootLength)
{
// Can't trim the path back any further
break;
}
else
{
// Temporarily set a null in the string to get Windows to look further up the path
inputBuffer[foundIndex] = '\0';
}
}
else if (result > outputBuffer.Capacity)
{
// Not enough space. The result count for this API does not include the null terminator.
outputBuffer.EnsureCapacity(checked ((int)result));
result = Interop.Kernel32.GetLongPathNameW(inputBuffer.UnderlyingArray, outputBuffer.UnderlyingArray, (uint)outputBuffer.Capacity);
}
else
{
// Found the path
success = true;
outputBuffer.Length = checked ((int)result);
if (foundIndex < inputLength - 1)
{
// It was a partial find, put the non-existent part of the path back
outputBuffer.Append(ref inputBuffer, foundIndex, inputBuffer.Length - foundIndex);
}
}
}
// Strip out the prefix and return the string
ref StringBuffer bufferToUse = ref Choose(success, ref outputBuffer, ref inputBuffer);
// Switch back from \\?\ to \\.\ if necessary
if (wasDotDevice)
{
bufferToUse[2] = '.';
}
string returnValue = null;
int newLength = (int)(bufferToUse.Length - rootDifference);
if (isDosUnc)
{
// Need to go from \\?\UNC\ to \\?\UN\\
bufferToUse[PathInternal.UncExtendedPrefixLength - PathInternal.UncPrefixLength] = '\\';
}
// We now need to strip out any added characters at the front of the string
if (bufferToUse.SubstringEquals(originalPath, rootDifference, newLength))
{
// Use the original path to avoid allocating
returnValue = originalPath;
}
else
{
returnValue = bufferToUse.Substring(rootDifference, newLength);
}
return(returnValue);
}
private static bool IsDosUnc(ref StringBuffer buffer)
{
return(!PathInternal.IsDevice(ref buffer) && buffer.Length > 1 && buffer[0] == '\\' && buffer[1] == '\\');
}
internal static string TryExpandShortFileName(ref ValueStringBuilder outputBuilder, string?originalPath)
{
// We guarantee we'll expand short names for paths that only partially exist. As such, we need to find the part of the path that actually does exist. To
// avoid allocating a lot we'll create only one input array and modify the contents with embedded nulls.
Debug.Assert(!PathInternal.IsPartiallyQualified(outputBuilder.AsSpan()), "should have resolved by now");
// We'll have one of a few cases by now (the normalized path will have already:
//
// 1. Dos path (C:\)
// 2. Dos UNC (\\Server\Share)
// 3. Dos device path (\\.\C:\, \\?\C:\)
//
// We want to put the extended syntax on the front if it doesn't already have it (for long path support and speed), which may mean switching from \\.\.
//
// Note that we will never get \??\ here as GetFullPathName() does not recognize \??\ and will return it as C:\??\ (or whatever the current drive is).
int rootLength = PathInternal.GetRootLength(outputBuilder.AsSpan());
bool isDevice = PathInternal.IsDevice(outputBuilder.AsSpan());
// As this is a corner case we're not going to add a stackalloc here to keep the stack pressure down.
var inputBuilder = new ValueStringBuilder();
bool isDosUnc = false;
int rootDifference = 0;
bool wasDotDevice = false;
// Add the extended prefix before expanding to allow growth over MAX_PATH
if (isDevice)
{
// We have one of the following (\\?\ or \\.\)
inputBuilder.Append(outputBuilder.AsSpan());
if (outputBuilder[2] == '.')
{
wasDotDevice = true;
inputBuilder[2] = '?';
}
}
else
{
isDosUnc = !PathInternal.IsDevice(outputBuilder.AsSpan()) && outputBuilder.Length > 1 && outputBuilder[0] == '\\' && outputBuilder[1] == '\\';
rootDifference = PrependDevicePathChars(ref outputBuilder, isDosUnc, ref inputBuilder);
}
rootLength += rootDifference;
int inputLength = inputBuilder.Length;
bool success = false;
int foundIndex = inputBuilder.Length - 1;
while (!success)
{
uint result = Interop.Kernel32.GetLongPathNameW(
ref inputBuilder.GetPinnableReference(terminate: true), ref outputBuilder.GetPinnableReference(), (uint)outputBuilder.Capacity);
// Replace any temporary null we added
if (inputBuilder[foundIndex] == '\0')
{
inputBuilder[foundIndex] = '\\';
}
if (result == 0)
{
// Look to see if we couldn't find the file
int error = Marshal.GetLastWin32Error();
if (error != Interop.Errors.ERROR_FILE_NOT_FOUND && error != Interop.Errors.ERROR_PATH_NOT_FOUND)
{
// Some other failure, give up
break;
}
// We couldn't find the path at the given index, start looking further back in the string.
foundIndex--;
for (; foundIndex > rootLength && inputBuilder[foundIndex] != '\\'; foundIndex--)
{
;
}
if (foundIndex == rootLength)
{
// Can't trim the path back any further
break;
}
else
{
// Temporarily set a null in the string to get Windows to look further up the path
inputBuilder[foundIndex] = '\0';
}
}
else if (result > outputBuilder.Capacity)
{
// Not enough space. The result count for this API does not include the null terminator.
outputBuilder.EnsureCapacity(checked ((int)result));
}
else
{
// Found the path
success = true;
outputBuilder.Length = checked ((int)result);
if (foundIndex < inputLength - 1)
{
// It was a partial find, put the non-existent part of the path back
outputBuilder.Append(inputBuilder.AsSpan(foundIndex, inputBuilder.Length - foundIndex));
}
}
}
// If we were able to expand the path, use it, otherwise use the original full path result
ref ValueStringBuilder builderToUse = ref (success ? ref outputBuilder : ref inputBuilder);
internal unsafe static string Normalize(string path, uint maxPathLength, bool checkInvalidCharacters, bool expandShortPaths)
{
StringBuffer stringBuffer;
if ((stringBuffer = LongPathHelper.t_fullPathBuffer) == null)
{
stringBuffer = (LongPathHelper.t_fullPathBuffer = new StringBuffer(260U));
}
StringBuffer stringBuffer2 = stringBuffer;
string result;
try
{
LongPathHelper.GetFullPathName(path, stringBuffer2);
stringBuffer2.TrimEnd(LongPathHelper.s_trimEndChars);
if (stringBuffer2.Length >= maxPathLength)
{
throw new PathTooLongException();
}
bool flag = false;
bool flag2 = false;
bool flag3 = stringBuffer2.Length > 1U && stringBuffer2[0U] == '\\' && stringBuffer2[1U] == '\\';
bool flag4 = PathInternal.IsDevice(stringBuffer2);
bool flag5 = flag3 && !flag4;
uint num = flag3 ? 2U : 0U;
uint num2 = flag3 ? 1U : 0U;
char *charPointer = stringBuffer2.CharPointer;
uint num3;
while (num < stringBuffer2.Length)
{
char c = charPointer[(ulong)num * 2UL / 2UL];
if (c < '?' || c == '\\' || c == '|' || c == '~')
{
if (c <= '>')
{
if (c != '"' && c != '<' && c != '>')
{
goto IL_155;
}
}
else if (c != '\\')
{
if (c != '|')
{
if (c != '~')
{
goto IL_155;
}
flag2 = true;
goto IL_16E;
}
}
else
{
num3 = num - num2 - 1U;
if (num3 > (uint)PathInternal.MaxComponentLength)
{
throw new PathTooLongException();
}
num2 = num;
if (flag2)
{
if (num3 <= 12U)
{
flag = true;
}
flag2 = false;
}
if (!flag5)
{
goto IL_16E;
}
if (num == stringBuffer2.Length - 1U)
{
throw new ArgumentException(Environment.GetResourceString("Arg_PathIllegalUNC"));
}
flag5 = false;
goto IL_16E;
}
if (checkInvalidCharacters)
{
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidPathChars"));
}
flag2 = false;
goto IL_16E;
IL_155:
if (checkInvalidCharacters && c < ' ')
{
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidPathChars"));
}
}
IL_16E:
num += 1U;
}
if (flag5)
{
throw new ArgumentException(Environment.GetResourceString("Arg_PathIllegalUNC"));
}
num3 = stringBuffer2.Length - num2 - 1U;
if (num3 > (uint)PathInternal.MaxComponentLength)
{
throw new PathTooLongException(Environment.GetResourceString("IO.PathTooLong"));
}
if (flag2 && num3 <= 12U)
{
flag = true;
}
if (expandShortPaths && flag)
{
result = LongPathHelper.TryExpandShortFileName(stringBuffer2, path);
}
else if (stringBuffer2.Length == (uint)path.Length && stringBuffer2.StartsWith(path))
{
result = path;
}
else
{
result = stringBuffer2.ToString();
}
}
finally
{
stringBuffer2.Free();
}
return(result);
}
internal static bool IsDeviceUNC(ReadOnlySpan <char> path)
{
return(path.Length >= 8 && PathInternal.IsDevice(path) && (PathInternal.IsDirectorySeparator(path[7]) && path[4] == 'U') && path[5] == 'N' && path[6] == 'C');
}
// Token: 0x06001953 RID: 6483 RVA: 0x0005437C File Offset: 0x0005257C
internal static bool HasWildCardCharacters(string path)
{
int startIndex = AppContextSwitches.UseLegacyPathHandling ? 0 : (PathInternal.IsDevice(path) ? "\\\\?\\".Length : 0);
return(PathInternal.AnyPathHasWildCardCharacters(path, startIndex));
}
// Token: 0x06001951 RID: 6481 RVA: 0x00054344 File Offset: 0x00052544
internal static bool HasIllegalCharacters(string path, bool checkAdditional = false)
{
return((AppContextSwitches.UseLegacyPathHandling || !PathInternal.IsDevice(path)) && PathInternal.AnyPathHasIllegalCharacters(path, checkAdditional));
}
public static string GetFullPath(string path, string basePath)
{
if (path == null)
{
throw new ArgumentNullException(nameof(path));
}
if (basePath == null)
{
throw new ArgumentNullException(nameof(basePath));
}
if (!IsPathFullyQualified(basePath))
{
throw new ArgumentException(SR.Arg_BasePathNotFullyQualified, nameof(basePath));
}
if (basePath.Contains('\0') || path.Contains('\0'))
{
throw new ArgumentException(SR.Argument_InvalidPathChars);
}
if (IsPathFullyQualified(path))
{
return(GetFullPathInternal(path));
}
if (PathInternal.IsEffectivelyEmpty(path.AsSpan()))
{
return(basePath);
}
int length = path.Length;
string combinedPath;
if (length >= 1 && PathInternal.IsDirectorySeparator(path[0]))
{
// Path is current drive rooted i.e. starts with \:
// "\Foo" and "C:\Bar" => "C:\Foo"
// "\Foo" and "\\?\C:\Bar" => "\\?\C:\Foo"
combinedPath = Join(GetPathRoot(basePath.AsSpan()), path.AsSpan(1)); // Cut the separator to ensure we don't end up with two separators when joining with the root.
}
else if (length >= 2 && PathInternal.IsValidDriveChar(path[0]) && path[1] == PathInternal.VolumeSeparatorChar)
{
// Drive relative paths
Debug.Assert(length == 2 || !PathInternal.IsDirectorySeparator(path[2]));
if (GetVolumeName(path.AsSpan()).EqualsOrdinal(GetVolumeName(basePath.AsSpan())))
{
// Matching root
// "C:Foo" and "C:\Bar" => "C:\Bar\Foo"
// "C:Foo" and "\\?\C:\Bar" => "\\?\C:\Bar\Foo"
combinedPath = Join(basePath.AsSpan(), path.AsSpan(2));
}
else
{
// No matching root, root to specified drive
// "D:Foo" and "C:\Bar" => "D:Foo"
// "D:Foo" and "\\?\C:\Bar" => "\\?\D:\Foo"
combinedPath = !PathInternal.IsDevice(basePath.AsSpan())
? path.Insert(2, @"\")
: length == 2
? JoinInternal(basePath.AsSpan(0, 4), path.AsSpan(), @"\".AsSpan())
: JoinInternal(basePath.AsSpan(0, 4), path.AsSpan(0, 2), @"\".AsSpan(), path.AsSpan(2));
}
}
else
{
// "Simple" relative path
// "Foo" and "C:\Bar" => "C:\Bar\Foo"
// "Foo" and "\\?\C:\Bar" => "\\?\C:\Bar\Foo"
combinedPath = JoinInternal(basePath.AsSpan(), path.AsSpan());
}
// Device paths are normalized by definition, so passing something of this format (i.e. \\?\C:\.\tmp, \\.\C:\foo)
// to Windows APIs won't do anything by design. Additionally, GetFullPathName() in Windows doesn't root
// them properly. As such we need to manually remove segments and not use GetFullPath().
return(PathInternal.IsDevice(combinedPath.AsSpan())
? PathInternal.RemoveRelativeSegments(combinedPath, PathInternal.GetRootLength(combinedPath.AsSpan()))
: GetFullPathInternal(combinedPath));
}
private static string TryExpandShortFileName(StringBuffer outputBuffer, string originalPath)
{
// We'll have one of a few cases by now (the normalized path will have already:
//
// 1. Dos path (C:\)
// 2. Dos UNC (\\Server\Share)
// 3. Dos device path (\\.\C:\, \\?\C:\)
//
// We want to put the extended syntax on the front if it doesn't already have it, which may mean switching from \\.\.
uint rootLength = PathInternal.GetRootLength(outputBuffer);
bool isDevice = PathInternal.IsDevice(outputBuffer);
StringBuffer inputBuffer = null;
bool isDosUnc = false;
uint rootDifference = 0;
bool wasDotDevice = false;
// Add the extended prefix before expanding to allow growth over MAX_PATH
if (isDevice)
{
// We have one of the following (\\?\ or \\.\)
// We will never get \??\ here as GetFullPathName() does not recognize \??\ and will return it as C:\??\ (or whatever the current drive is).
inputBuffer = new StringBuffer();
inputBuffer.Append(outputBuffer);
if (outputBuffer[2] == '.')
{
wasDotDevice = true;
inputBuffer[2] = '?';
}
}
else
{
// \\Server\Share, but not \\.\ or \\?\.
// We need to know this to be able to push \\?\UNC\ on if required
isDosUnc = outputBuffer.Length > 1 && outputBuffer[0] == '\\' && outputBuffer[1] == '\\' && !PathInternal.IsDevice(outputBuffer);
rootDifference = GetInputBuffer(outputBuffer, isDosUnc, out inputBuffer);
}
rootLength += rootDifference;
uint inputLength = inputBuffer.Length;
bool success = false;
uint foundIndex = inputBuffer.Length - 1;
while (!success)
{
uint result = Win32Native.GetLongPathNameW(inputBuffer.GetHandle(), outputBuffer.GetHandle(), outputBuffer.CharCapacity);
// Replace any temporary null we added
if (inputBuffer[foundIndex] == '\0')
{
inputBuffer[foundIndex] = '\\';
}
if (result == 0)
{
// Look to see if we couldn't find the file
int error = Marshal.GetLastWin32Error();
if (error != Win32Native.ERROR_FILE_NOT_FOUND && error != Win32Native.ERROR_PATH_NOT_FOUND)
{
// Some other failure, give up
break;
}
// We couldn't find the path at the given index, start looking further back in the string.
foundIndex--;
for (; foundIndex > rootLength && inputBuffer[foundIndex] != '\\'; foundIndex--)
{
;
}
if (foundIndex == rootLength)
{
// Can't trim the path back any further
break;
}
else
{
// Temporarily set a null in the string to get Windows to look further up the path
inputBuffer[foundIndex] = '\0';
}
}
else if (result > outputBuffer.CharCapacity)
{
// Not enough space. The result count for this API does not include the null terminator.
outputBuffer.EnsureCharCapacity(result);
result = Win32Native.GetLongPathNameW(inputBuffer.GetHandle(), outputBuffer.GetHandle(), outputBuffer.CharCapacity);
}
else
{
// Found the path
success = true;
outputBuffer.Length = result;
if (foundIndex < inputLength - 1)
{
// It was a partial find, put the non-existent part of the path back
outputBuffer.Append(inputBuffer, foundIndex, inputBuffer.Length - foundIndex);
}
}
}
// Strip out the prefix and return the string
StringBuffer bufferToUse = success ? outputBuffer : inputBuffer;
if (wasDotDevice)
{
bufferToUse[2] = '.';
}
string returnValue = null;
int newLength = (int)(bufferToUse.Length - rootDifference);
if (isDosUnc)
{
// Need to go from \\?\UNC\ to \\?\UN\\
bufferToUse[(uint)PathInternal.UncExtendedPathPrefix.Length - 1] = '\\';
}
// We now need to strip out any added characters at the front of the string
if (bufferToUse.SubstringEquals(originalPath, rootDifference, newLength))
{
// Use the original path to avoid allocating
returnValue = originalPath;
}
else
{
returnValue = bufferToUse.Substring(rootDifference, newLength);
}
inputBuffer.Dispose();
return(returnValue);
}
