private static bool FileOrDirectoryExists(FileArtifactType fileArtifactType, string path)
{
// The path gets normalized so we always use backslashes
path = NormalizePathToWindowsStyle(path);
WindowsNative.Win32FindData findResult;
using (var findHandle = WindowsNative.FindFirstFileW(path.TrimEnd('\\'), out findResult))
{
// Any error is interpreted as a file not found. This matches the managed Directory.Exists and File.Exists behavior
if (findHandle.IsInvalid)
{
return(false);
}
if (fileArtifactType == FileArtifactType.FileOrDirectory)
{
return(true);
}
var isDirectory = (findResult.DwFileAttributes & FileAttributes.Directory) != 0;
return(!(fileArtifactType == FileArtifactType.Directory ^ isDirectory));
}
}
private static WindowsNative.EnumerateDirectoryResult CustomEnumerateDirectoryEntries(
string directoryPath,
FileArtifactType fileArtifactType,
string pattern,
SearchOption searchOption,
ICollection <string> result)
{
var searchDirectoryPath = Path.Combine(directoryPath.TrimEnd('\\'), "*");
WindowsNative.Win32FindData findResult;
using (var findHandle = WindowsNative.FindFirstFileW(searchDirectoryPath, out findResult))
{
if (findHandle.IsInvalid)
{
int hr = Marshal.GetLastWin32Error();
Debug.Assert(hr != WindowsNative.ErrorFileNotFound);
WindowsNative.EnumerateDirectoryStatus findHandleOpenStatus;
switch (hr)
{
case WindowsNative.ErrorFileNotFound:
findHandleOpenStatus = WindowsNative.EnumerateDirectoryStatus.SearchDirectoryNotFound;
break;
case WindowsNative.ErrorPathNotFound:
findHandleOpenStatus = WindowsNative.EnumerateDirectoryStatus.SearchDirectoryNotFound;
break;
case WindowsNative.ErrorDirectory:
findHandleOpenStatus = WindowsNative.EnumerateDirectoryStatus.CannotEnumerateFile;
break;
case WindowsNative.ErrorAccessDenied:
findHandleOpenStatus = WindowsNative.EnumerateDirectoryStatus.AccessDenied;
break;
default:
findHandleOpenStatus = WindowsNative.EnumerateDirectoryStatus.UnknownError;
break;
}
return(new WindowsNative.EnumerateDirectoryResult(directoryPath, findHandleOpenStatus, hr));
}
while (true)
{
var isDirectory = (findResult.DwFileAttributes & FileAttributes.Directory) != 0;
// There will be entries for the current and parent directories. Ignore those.
if (!isDirectory || (findResult.CFileName != "." && findResult.CFileName != ".."))
{
// Make sure pattern and directory/file filters are honored
// We special case the "*" pattern since it is the default when no pattern is specified
// so we avoid calling the matching function
if (pattern == "*" ||
WindowsNative.PathMatchSpecExW(findResult.CFileName, pattern, WindowsNative.DwFlags.PmsfNormal) ==
WindowsNative.ErrorSuccess)
{
if (fileArtifactType == FileArtifactType.FileOrDirectory ||
!(fileArtifactType == FileArtifactType.Directory ^ isDirectory))
{
result.Add(Path.Combine(directoryPath, findResult.CFileName));
}
}
// Recursively go into subfolders if specified
if (searchOption == SearchOption.AllDirectories && isDirectory)
{
var recurs = CustomEnumerateDirectoryEntries(
Path.Combine(directoryPath, findResult.CFileName),
fileArtifactType,
pattern,
searchOption,
result);
if (!recurs.Succeeded)
{
return(recurs);
}
}
}
if (!WindowsNative.FindNextFileW(findHandle, out findResult))
{
int hr = Marshal.GetLastWin32Error();
if (hr == WindowsNative.ErrorNoMoreFiles)
{
// Graceful completion of enumeration.
return(new WindowsNative.EnumerateDirectoryResult(
directoryPath,
WindowsNative.EnumerateDirectoryStatus.Success,
hr));
}
Debug.Assert(hr != WindowsNative.ErrorSuccess);
return(new WindowsNative.EnumerateDirectoryResult(
directoryPath,
WindowsNative.EnumerateDirectoryStatus.UnknownError,
hr));
}
}
}
}