private static string TryExpandShortFileName(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.IsRelative(outputBuffer), "should have resolved by now");
Debug.Assert(!PathInternal.IsExtended(outputBuffer), "expanding short names expects normal paths");
// Add the extended prefix before expanding to allow growth over MAX_PATH
StringBuffer inputBuffer = null;
ulong rootLength = PathInternal.GetRootLength(outputBuffer);
bool isUnc = IsUnc(outputBuffer);
ulong rootDifference = GetInputBuffer(outputBuffer, isUnc, out inputBuffer);
rootLength += rootDifference;
ulong inputLength = inputBuffer.Length;
bool success = false;
ulong foundIndex = inputBuffer.Length - 1;
while (!success)
{
uint result = Interop.mincore.GetLongPathNameW(inputBuffer.GetHandle(), outputBuffer.GetHandle(), (uint)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 != Interop.mincore.Errors.ERROR_FILE_NOT_FOUND && error != Interop.mincore.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.CharCapacity)
{
// Not enough space. The result count for this API does not include the null terminator.
outputBuffer.EnsureCharCapacity(result);
result = Interop.mincore.GetLongPathNameW(inputBuffer.GetHandle(), outputBuffer.GetHandle(), (uint)outputBuffer.CharCapacity);
}
else
{
// Found the path
success = true;
outputBuffer.Length = result;
if (foundIndex < inputLength - 1)
{
// It was a partial find, put the non-existant 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;
string returnValue = null;
int newLength = (int)(bufferToUse.Length - rootDifference);
if (isUnc)
{
// Need to go from \\?\UNC\ to \\?\UN\\
bufferToUse[(ulong)PathInternal.UncExtendedPathPrefix.Length - 1] = '\\';
}
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;
}
private static string NewGetCurrentDirectory()
{
using (StringBuffer buffer = new StringBuffer(PathInternal.MaxShortPath))
{
uint result = 0;
while ((result = Win32Native.GetCurrentDirectoryW(buffer.CharCapacity, buffer.GetHandle())) > buffer.CharCapacity)
{
// Reported size is greater than the buffer size. Increase the capacity.
// The size returned includes the null only if more space is needed (this case).
buffer.EnsureCharCapacity(result);
}
if (result == 0)
__Error.WinIOError();
buffer.Length = result;
#if !PLATFORM_UNIX
if (buffer.Contains('~'))
return LongPathHelper.GetLongPathName(buffer);
#endif
return buffer.ToString();
}
}
private static void GetFullPathName(string path, StringBuffer fullPath)
{
// If the string starts with an extended prefix we would need to remove it from the path before we call GetFullPathName as
// it doesn't root extended paths correctly. We don't currently resolve extended paths, so we'll just assert here.
Debug.Assert(PathInternal.IsRelative(path) || !PathInternal.IsExtended(path));
// Historically we would skip leading spaces *only* if the path started with a drive " C:" or a UNC " \\"
int startIndex = PathInternal.PathStartSkip(path);
fixed (char* pathStart = path)
{
uint result = 0;
while ((result = Interop.mincore.GetFullPathNameW(pathStart + startIndex, (uint)fullPath.CharCapacity, fullPath.GetHandle(), IntPtr.Zero)) > fullPath.CharCapacity)
{
// Reported size (which does not include the null) is greater than the buffer size. Increase the capacity.
fullPath.EnsureCharCapacity(result);
}
if (result == 0)
{
// Failure, get the error and throw
int errorCode = Marshal.GetLastWin32Error();
if (errorCode == 0)
errorCode = Interop.mincore.Errors.ERROR_BAD_PATHNAME;
throw Win32Marshal.GetExceptionForWin32Error(errorCode, path);
}
fullPath.Length = result;
}
}
private static string TryExpandShortFileName(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(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).
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 \\.\)
inputBuffer = new StringBuffer();
inputBuffer.Append(outputBuffer);
if (outputBuffer[2] == '.')
{
wasDotDevice = true;
inputBuffer[2] = '?';
}
}
else
{
isDosUnc = IsDosUnc(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 = Interop.mincore.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 != Interop.mincore.Errors.ERROR_FILE_NOT_FOUND && error != Interop.mincore.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.CharCapacity)
{
// Not enough space. The result count for this API does not include the null terminator.
outputBuffer.EnsureCharCapacity(result);
result = Interop.mincore.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;
}
private unsafe static string TryExpandShortFileName(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.
Contract.Assert(!PathInternal.IsPartiallyQualified(outputBuffer), "should have resolved by now");
using (StringBuffer inputBuffer = new StringBuffer(outputBuffer))
{
bool success = false;
uint lastIndex = outputBuffer.Length - 1;
uint foundIndex = lastIndex;
uint rootLength = PathInternal.GetRootLength(outputBuffer);
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);
}
else
{
// Found the path
success = true;
outputBuffer.Length = result;
if (foundIndex < lastIndex)
{
// It was a partial find, put the non-existant part of the path back
outputBuffer.Append(inputBuffer, foundIndex, inputBuffer.Length - foundIndex);
}
}
}
StringBuffer bufferToUse = success ? outputBuffer : inputBuffer;
if (bufferToUse.SubstringEquals(originalPath))
{
// Use the original path to avoid allocating
return originalPath;
}
return bufferToUse.ToString();
}
}
unsafe internal static string GetLongPathName(string path)
{
using (StringBuffer outputBuffer = new StringBuffer((uint)path.Length))
{
uint result = 0;
while ((result = Win32Native.GetLongPathNameW(path, outputBuffer.GetHandle(), outputBuffer.CharCapacity)) > outputBuffer.CharCapacity)
{
// Reported size (which does not include the null) is greater than the buffer size. Increase the capacity.
outputBuffer.EnsureCharCapacity(result);
}
if (result == 0)
{
// Failure, get the error and throw
GetErrorAndThrow(path);
}
outputBuffer.Length = result;
return outputBuffer.ToString();
}
}
/*===============================CurrentDirectory===============================
**Action: Provides a getter and setter for the current directory. The original
** current DirectoryInfo is the one from which the process was started.
**Returns: The current DirectoryInfo (from the getter). Void from the setter.
**Arguments: The current DirectoryInfo to which to switch to the setter.
**Exceptions:
==============================================================================*/
public static String GetCurrentDirectory()
{
// Start with a buffer the size of MAX_PATH
using (StringBuffer buffer = new StringBuffer(260))
{
uint result = 0;
while ((result = Win32Native.GetCurrentDirectoryW(buffer.CharCapacity, buffer.GetHandle())) > buffer.CharCapacity)
{
// Reported size is greater than the buffer size. Increase the capacity.
// The size returned includes the null only if more space is needed (this case).
buffer.EnsureCharCapacity(result);
}
if (result == 0)
__Error.WinIOError();
buffer.Length = result;
#if !PLATFORM_UNIX
if (buffer.Contains('~'))
return Path.GetFullPath(buffer.ToString());
#endif
return buffer.ToString();
}
}
