1 files changed, 62 insertions, 0 deletions
diff --git a/zenserver/experimental/usnjournal.h b/zenserver/experimental/usnjournal.h
new file mode 100644
index 000000000..9c1008d52
--- /dev/null
+++ b/zenserver/experimental/usnjournal.h
@@ -0,0 +1,62 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#pragma once
+
+#include <zencore/windows.h>
+
+#include <winioctl.h>
+
+#include <filesystem>
+
+namespace zen {
+
+class UsnJournalReader
+{
+public:
+	UsnJournalReader();
+	~UsnJournalReader();
+
+	bool Initialize(std::filesystem::path VolumePath);
+
+private:
+	void*					 m_VolumeHandle;
+	READ_USN_JOURNAL_DATA_V1 m_ReadUsnJournalData;
+	bool					 m_IncursSeekPenalty = true;
+
+	uint8_t* m_JournalReadBuffer = nullptr;
+	uint64_t m_ReadBufferSize	 = 64 * 1024;
+
+	struct Frn
+	{
+		uint8_t IdBytes[16];
+
+		Frn() = default;
+
+		Frn(const FILE_ID_128& Rhs) { memcpy(IdBytes, Rhs.Identifier, sizeof IdBytes); }
+		Frn& operator=(const FILE_ID_128& Rhs) { memcpy(IdBytes, Rhs.Identifier, sizeof IdBytes); }
+
+		Frn(const uint64_t& Rhs)
+		{
+			memcpy(IdBytes, &Rhs, sizeof Rhs);
+			memset(&IdBytes[8], 0, 8);
+		}
+
+		Frn& operator=(const uint64_t& Rhs)
+		{
+			memcpy(IdBytes, &Rhs, sizeof Rhs);
+			memset(&IdBytes[8], 0, 8);
+		}
+
+		std::strong_ordering operator<=>(const Frn&) const = default;
+	};
+
+	enum class FileSystemType
+	{
+		ReFS,
+		NTFS
+	};
+
+	FileSystemType m_FileSystemType = FileSystemType::NTFS;
+};
+
+}  // namespace zen