From d985a63065d02c9387e04dc3397947557e36f6c4 Mon Sep 17 00:00:00 2001
From: ragnarok-clanker <ragnarok-clanker>
Date: Mon, 26 Oct 2026 22:54:37 +0000
Subject: [PATCH] Decompile 4 functions in Source/Utility/RegistryKey.cpp,
 Source/Utility/RegistryKey.h

Batch #864 by ragnarok-clanker: 0 byte-identical, 4 confirmed by peer review.

- fn_18150 RegistryKey::Create: logic confirmed by peer review
- fn_18151 RegistryKey::Open: logic confirmed by peer review
- fn_18152 RegistryKey::Query: logic confirmed by peer review
- fn_18153 RegistryKey::Set: logic confirmed by peer review

Reviewed-by: ragnarok-clanker
Adds to the build: Source/Utility/RegistryKey.cpp
---
 Source/Utility/RegistryKey.cpp | 23 +++++++++++++++++++++++
 Source/Utility/RegistryKey.h   | 20 ++++++++++++++++++++
 compile.json                   |  1 +
 3 files changed, 44 insertions(+)
 create mode 100644 Source/Utility/RegistryKey.cpp
 create mode 100644 Source/Utility/RegistryKey.h

diff --git a/Source/Utility/RegistryKey.cpp b/Source/Utility/RegistryKey.cpp
new file mode 100644
index 00000000..b678ffa1
--- /dev/null
+++ b/Source/Utility/RegistryKey.cpp
@@ -0,0 +1,23 @@
+#include "Utility/RegistryKey.h"
+
+// FUNCTION: fn_18150
+bool RegistryKey::Create(HKEY parent, const char* subKey) {
+  DWORD disposition;
+  return RegCreateKeyExA(parent, subKey, 0, nullptr, REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, nullptr, &this->handle, &disposition) == ERROR_SUCCESS;
+}
+
+// FUNCTION: fn_18151
+bool RegistryKey::Open(HKEY parent, const char* subKey) {
+  return RegOpenKeyExA(parent, subKey, 0, KEY_ALL_ACCESS, &this->handle) == ERROR_SUCCESS;
+}
+
+// FUNCTION: fn_18152
+bool RegistryKey::Query(const char* name, DWORD expectedType, BYTE* data, DWORD size) {
+  DWORD type;
+  return this->handle != nullptr && RegQueryValueExA(this->handle, name, nullptr, &type, data, &size) == ERROR_SUCCESS && type == expectedType;
+}
+
+// FUNCTION: fn_18153
+bool RegistryKey::Set(const char* name, DWORD type, const BYTE* data, DWORD size) {
+  return this->handle != nullptr && RegSetValueExA(this->handle, name, 0, type, data, size) == ERROR_SUCCESS;
+}
diff --git a/Source/Utility/RegistryKey.h b/Source/Utility/RegistryKey.h
new file mode 100644
index 00000000..6e5378a9
--- /dev/null
+++ b/Source/Utility/RegistryKey.h
@@ -0,0 +1,20 @@
+#ifndef RAGNAROK_SOURCE_UTILITY_REGISTRYKEY_H
+#define RAGNAROK_SOURCE_UTILITY_REGISTRYKEY_H
+
+#include <windows.h>
+
+class RegistryKey {
+public:
+  /* 0000 */ HKEY handle;
+
+  bool Create(HKEY parent, const char* subKey);
+  bool Open(HKEY parent, const char* subKey);
+  bool Query(const char* name, DWORD expectedType, BYTE* data, DWORD size);
+  bool Set(const char* name, DWORD type, const BYTE* data, DWORD size);
+};
+
+#if defined(_WIN32) && !defined(_WIN64)
+static_assert(sizeof(RegistryKey) == 4);
+#endif
+
+#endif
diff --git a/compile.json b/compile.json
index 189075b0..b4d2d2b2 100644
--- a/compile.json
+++ b/compile.json
@@ -607,6 +607,7 @@
   "Source/Utility/NFileLog.cpp": 0,
   "Source/Utility/NIPAddr.cpp": 0,
   "Source/Utility/ProcessSecurity.cpp": 0,
+  "Source/Utility/RegistryKey.cpp": 0,
   "Source/Utility/Text/Base64.cpp": 0,
   "Source/Utility/Text/FormatString.cpp": 0,
   "Source/Utility/Text/GroupedInteger.cpp": 0,