Path from handle perf improvement (#206)

* Read recorded requests to memory before parsing
This will more accurately simulate how requests comes in from a client
* Make a fast path for GetFinalPathNameByHandleW
Try to get the path with a fixes size buffer first to avoid always doing two calls to GetFinalPathNameByHandleW

1 files changed, 10 insertions, 2 deletions

diff --git a/zencore/filesystem.cpp b/zencore/filesystem.cpp
index 1e4a52638..a2442a134 100644
--- a/zencore/filesystem.cpp
+++ b/zencore/filesystem.cpp
@@ -976,19 +976,27 @@ PathFromHandle(void* NativeHandle)
 		}
 	};
 
-	DWORD RequiredLengthIncludingNul = GetFinalPathNameByHandleWRetry(NativeHandle, nullptr, 0, FILE_NAME_OPENED);
+	static const DWORD PathDataSize = 512;
+	wchar_t			   PathData[PathDataSize];
+	DWORD			   RequiredLengthIncludingNul = GetFinalPathNameByHandleWRetry(NativeHandle, PathData, PathDataSize, FILE_NAME_OPENED);
 	if (RequiredLengthIncludingNul == 0)
 	{
 		ThrowLastError(fmt::format("failed to get path from file handle {}", NativeHandle));
 	}
 
+	if (RequiredLengthIncludingNul < PathDataSize)
+	{
+		std::wstring FullPath(PathData, gsl::narrow<size_t>(RequiredLengthIncludingNul));
+		return FullPath;
+	}
+
 	std::wstring FullPath;
 	FullPath.resize(RequiredLengthIncludingNul - 1);
 
 	const DWORD FinalLength = GetFinalPathNameByHandleWRetry(NativeHandle, FullPath.data(), RequiredLengthIncludingNul, FILE_NAME_OPENED);
 	ZEN_UNUSED(FinalLength);
-
 	return FullPath;
+
 #elif ZEN_PLATFORM_LINUX
 	char Link[PATH_MAX];
 	char Path[64];