From afc73a4db809af82b1d5f3595d90dcd9e84efec5 Mon Sep 17 00:00:00 2001
From: ragnarok-clanker <ragnarok-clanker>
Date: Thu, 29 Oct 2026 18:10:55 +0000
Subject: [PATCH] Decompile fn_18137 (CGPak::ApplyAuxiliary)

Batch #2550 by willerthal: 0 byte-identical, 1 confirmed by peer review.

- fn_18137 CGPak::ApplyAuxiliary: logic confirmed by peer review

Peer-reviewed-by: meitogi, youko
Reviewed-by: ragnarok-clanker
---
 Source/Archive/GPak.cpp |  6 ++++++
 Source/Archive/GPak.h   | 11 ++++++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/Source/Archive/GPak.cpp b/Source/Archive/GPak.cpp
index 2ce2d917..c362ca26 100644
--- a/Source/Archive/GPak.cpp
+++ b/Source/Archive/GPak.cpp
@@ -414,6 +414,12 @@ void CGPak::ReadAuxiliary(std::vector<std::uint8_t>& output, std::uint64_t* iden
   }
 }
 
+// OFFSET: 0x00AEC9F0
+// FUNCTION: fn_18137
+void CGPak::ApplyAuxiliary(const void* data, std::uint32_t size, const void* auxData, std::uint32_t auxSize) {
+  this->m_auxiliary.Apply(data, size, auxData, auxSize);
+}
+
 // OFFSET: 0x00E555A0
 // FUNCTION: fn_24306
 myGPack::CGPakUpdate::CGPakUpdate() {
diff --git a/Source/Archive/GPak.h b/Source/Archive/GPak.h
index 10529328..c7e6b090 100644
--- a/Source/Archive/GPak.h
+++ b/Source/Archive/GPak.h
@@ -28,6 +28,14 @@ namespace myGPack {
 
 }
 
+struct PakAuxiliary {
+  void Apply(const void* data, std::uint32_t size, const void* auxData, std::uint32_t auxSize);
+
+  /* 0000 */ std::uint8_t unknown_0000[244];
+};
+
+static_assert(sizeof(PakAuxiliary) == 244);
+
 class CGPak {
 public:
   CGPak();
@@ -38,6 +46,7 @@ public:
   bool Find(const myGPack::PakName& name, myGPack::PakEntry* entry) const;
   bool Extract(const myGPack::PakEntry* entry, void* buffer);
   void ReadAuxiliary(std::vector<std::uint8_t>& output, std::uint64_t* identifier = nullptr);
+  void ApplyAuxiliary(const void* data, std::uint32_t size, const void* auxData, std::uint32_t auxSize);
 
 protected:
   bool ReadTableV1();
@@ -53,7 +62,7 @@ protected:
   /* 0024 */ std::vector<myGPack::PakEntry> m_entries;
   /* 0030 */ std::vector<std::uint8_t> m_scratch;
   /* 003C */ CRITICAL_SECTION m_criticalSection;
-  /* 0054 */ std::uint8_t unknown_0054[244];
+  /* 0054 */ PakAuxiliary m_auxiliary;
 };
 
 #if defined(_WIN32) && !defined(_WIN64)