multithreaded clean (#331)

- Improvement: Faster cleaning of directories
- Improvement: Faster initial scanning of local state

1 files changed, 51 insertions, 4 deletions

diff --git a/src/zencore/filesystem.cpp b/src/zencore/filesystem.cpp
index 6ff4dd053..4ec563ba3 100644
--- a/src/zencore/filesystem.cpp
+++ b/src/zencore/filesystem.cpp
@@ -280,16 +280,17 @@ bool
 RemoveFileNative(const std::filesystem::path& Path, bool ForceRemoveReadOnlyFiles, std::error_code& Ec)
 {
 #if ZEN_PLATFORM_WINDOWS
-	BOOL Success = ::DeleteFile(Path.native().c_str());
+	const std::filesystem::path::value_type* NativePath = Path.native().c_str();
+	BOOL									 Success	= ::DeleteFile(NativePath);
 	if (!Success)
 	{
 		if (ForceRemoveReadOnlyFiles)
 		{
-			DWORD FileAttributes = ::GetFileAttributes(Path.native().c_str());
+			DWORD FileAttributes = ::GetFileAttributes(NativePath);
 			if ((FileAttributes != INVALID_FILE_ATTRIBUTES) && IsFileAttributeReadOnly(FileAttributes) != 0)
 			{
-				::SetFileAttributes(Path.native().c_str(), MakeFileAttributeReadOnly(FileAttributes, false));
-				Success = ::DeleteFile(Path.native().c_str());
+				::SetFileAttributes(NativePath, MakeFileAttributeReadOnly(FileAttributes, false));
+				Success = ::DeleteFile(NativePath);
 			}
 		}
 		if (!Success)
@@ -1964,6 +1965,52 @@ GetModificationTickFromPath(const std::filesystem::path& Filename)
 #endif
 }
 
+bool
+TryGetFileProperties(const std::filesystem::path& Path,
+					 uint64_t&					  OutSize,
+					 uint64_t&					  OutModificationTick,
+					 uint32_t&					  OutNativeModeOrAttributes)
+{
+#if ZEN_PLATFORM_WINDOWS
+	const std::filesystem::path::value_type* NativePath = Path.native().c_str();
+	{
+		void* Handle = CreateFileW(NativePath,
+								   GENERIC_READ,
+								   FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+								   nullptr,
+								   OPEN_EXISTING,
+								   0,
+								   nullptr);
+		if (Handle == INVALID_HANDLE_VALUE)
+		{
+			return false;
+		}
+		auto _ = MakeGuard([Handle]() { CloseHandle(Handle); });
+
+		BY_HANDLE_FILE_INFORMATION Bhfh = {};
+		if (!GetFileInformationByHandle(Handle, &Bhfh))
+		{
+			return false;
+		}
+		OutSize					  = uint64_t(Bhfh.nFileSizeHigh) << 32 | Bhfh.nFileSizeLow;
+		OutModificationTick		  = ((uint64_t(Bhfh.ftLastWriteTime.dwHighDateTime) << 32) | Bhfh.ftLastWriteTime.dwLowDateTime);
+		OutNativeModeOrAttributes = Bhfh.dwFileAttributes;
+		return true;
+	}
+#else
+	struct stat Stat;
+	int			err = stat(Path.native().c_str(), &Stat);
+	if (err)
+	{
+		return false;
+	}
+	OutModificationTick		  = gsl::narrow<uint64_t>(Stat.st_mtime);
+	OutSize					  = size_t(Stat.st_size);
+	OutNativeModeOrAttributes = (uint32_t)Stat.st_mode;
+	return true;
+#endif
+}
+
 void
 RenameFile(const std::filesystem::path& SourcePath, const std::filesystem::path& TargetPath)
 {