From 68913b02eb4bf57b7e73f3f752196fab5ceadb3a Mon Sep 17 00:00:00 2001
From: ragnarok-clanker <ragnarok-clanker>
Date: Thu, 29 Oct 2026 21:41:48 +0000
Subject: [PATCH] Decompile fn_06598 (IsBookItem)

Batch #3227 by ragnarok-clanker: 0 byte-identical, 1 confirmed by peer review.

- fn_06598 IsBookItem: logic confirmed by peer review

Peer-reviewed-by: eAthena, meitogi, superintelligence
Accepted without human review: peers confirmed the logic ("same" ahead by at least 3, with 70% of the votes).
---
 Source/Contents/Items/ItemDescription.h | 2 ++
 Source/Contents/Items/ItemNaming.cpp    | 9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/Source/Contents/Items/ItemDescription.h b/Source/Contents/Items/ItemDescription.h
index 32c535c5..b79c5779 100644
--- a/Source/Contents/Items/ItemDescription.h
+++ b/Source/Contents/Items/ItemDescription.h
@@ -37,11 +37,13 @@ struct ItemDescriptions {
 
 extern std::map<int, ITEM_DESC> g_itemDescriptions;
 extern std::map<int, std::vector<const char*>> g_metalProcessItems;
+extern std::map<int, std::vector<const char*>> g_bookItemNames;
 
 ITEM_DESC& FindItemDescription(int id);
 ItemCardName& EnsureItemCardName(int id, std::map<int, ItemCardName>& values);
 std::vector<const char*>& EnsureItemDescriptionLines(int id, std::map<int, std::vector<const char*>>& values);
 const std::vector<const char*>& FindMetalProcessItems(int id);
+bool IsBookItem(int id);
 
 #if defined(_WIN32) && !defined(_WIN64)
 static_assert(sizeof(ITEM_DESC) == 68);
diff --git a/Source/Contents/Items/ItemNaming.cpp b/Source/Contents/Items/ItemNaming.cpp
index ee24edca..2dc48347 100644
--- a/Source/Contents/Items/ItemNaming.cpp
+++ b/Source/Contents/Items/ItemNaming.cpp
@@ -18,6 +18,9 @@ std::map<int, std::vector<const char*>> g_metalProcessItems;
 // GLOBAL: gl_24675
 std::map<int, ItemCardName> g_itemCardNames;
 
+// GLOBAL: gl_24727
+std::map<int, std::vector<const char*>> g_bookItemNames;
+
 namespace {
   // OFFSET: 0x006D8810
   // FUNCTION: fn_06597
@@ -412,6 +415,12 @@ std::vector<unsigned char> ITEM_INFO::Serialize() const {
   return result;
 }
 
+// OFFSET: 0x006D8850
+// FUNCTION: fn_06598
+bool IsBookItem(int id) {
+  return g_bookItemNames.find(id) != g_bookItemNames.end();
+}
+
 // OFFSET: 0x006D7660
 // FUNCTION: fn_06591
 const char* ItemResourcePath(const ITEM_INFO& item) {